WO2015194268A1 - Extension and retraction device for telescopic boom - Google Patents

Extension and retraction device for telescopic boom Download PDF

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Publication number
WO2015194268A1
WO2015194268A1 PCT/JP2015/062972 JP2015062972W WO2015194268A1 WO 2015194268 A1 WO2015194268 A1 WO 2015194268A1 JP 2015062972 W JP2015062972 W JP 2015062972W WO 2015194268 A1 WO2015194268 A1 WO 2015194268A1
Authority
WO
WIPO (PCT)
Prior art keywords
boom
telescopic
support member
top boom
end side
Prior art date
Application number
PCT/JP2015/062972
Other languages
French (fr)
Japanese (ja)
Inventor
正裕 石井
征男 樫原
Original Assignee
株式会社タダノ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2014124211A external-priority patent/JP6390058B2/en
Priority claimed from JP2014185635A external-priority patent/JP6390059B2/en
Priority claimed from JP2014213904A external-priority patent/JP6405879B2/en
Priority claimed from JP2014213905A external-priority patent/JP6405880B2/en
Application filed by 株式会社タダノ filed Critical 株式会社タダノ
Priority to CN201580030872.5A priority Critical patent/CN106536398B/en
Priority to KR1020167035073A priority patent/KR101891909B1/en
Publication of WO2015194268A1 publication Critical patent/WO2015194268A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/065—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks non-masted
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
    • B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
    • B66F11/044—Working platforms suspended from booms
    • B66F11/046—Working platforms suspended from booms of the telescoping type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/065—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks non-masted
    • B66F9/0655—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks non-masted with a telescopic boom

Definitions

  • the present invention relates to a telescopic device used for expansion and contraction of a four-stage or more telescopic boom provided in a working machine such as a crane truck or an aerial work platform.
  • the telescopic device expands and contracts the top boom in conjunction with the telescopic operation of the telescopic cylinder on the top boom side in at least two telescopic cylinders and at least two telescopic cylinders that extend and contract a plurality of booms other than the top boom.
  • a telescopic mechanism In this telescopic mechanism, two sheaves (extension sheave and reduction sheave) and two wires (extension wire and reduction wire) are used.
  • the insertion work refers to an operation of extending the telescopic boom when carrying a suspended load into the building or at a site where tree branches are dense in a landscaping operation.
  • the present invention has been made in view of such a conventional problem, and is capable of improving the operability of the telescopic boom while reducing the cost and increasing the efficiency of the insertion work.
  • An object is to provide a boom telescopic device.
  • the telescopic boom telescopic device of the present invention is an telescopic boom telescopic device used for telescopic expansion and contraction of a four-stage or more telescopic boom provided in a working machine, At least one telescopic cylinder that is disposed in the top boom at the time of full contraction and expands / contracts the boom that is two or lower steps below the top boom, and the top boom that is located on the top boom side in the at least one telescopic cylinder
  • a telescopic mechanism that simultaneously expands and contracts the top boom and its lower boom in conjunction with the expansion and contraction operation of the side expansion cylinder;
  • the telescopic mechanism includes a bar-like support member that is fixed at one end side to the base end side in the lower boom and disposed in the top boom, and the bar-like support member has the top boom at the tip side thereof.
  • a top boom elongating sheave for elongating is arranged to be built in the top boom.
  • a boom lowering sheave for extending the lower boom is incorporated in the top boom at the distal end of the top boom side telescopic cylinder. It is preferable to arrange in.
  • a top boom reducing sheave for contracting the top boom is disposed on the base end side in the lower boom.
  • the top boom reducing sheave is disposed on the base end side of the rod-shaped support member on the base end side in the one-stage lower boom.
  • the position of the top boom extending sheave with respect to the bar-shaped support member is such that a horizontal line passing through the rotation center of the top boom extending sheave in the length direction of the bar-shaped support member.
  • the rod-shaped support member is preferably set so as to coincide with the neutral axis or to be positioned in the vicinity of the neutral axis.
  • the top boom extending sheaves are arranged in a pair of left and right on the distal end side of the rod-like support member, and together with the pair of top boom extending sheaves, the top boom
  • the top boom extension wire used for extending the hook is hung on the pair of top boom extension sheaves via the tip side of the top boom side telescopic cylinder, and both ends thereof are connected to the base in the top boom. It is preferable to be fixed to the end side.
  • the sheaves for reducing the top boom are arranged in a pair of left and right on the base end side of the rod-shaped support member, and the top boom together with the pair of top boom reducing sheaves.
  • a top boom reduction wire used to reduce the boom is hung on the pair of top boom reduction sheaves via the distal end side of the top boom side telescopic cylinder, and both ends thereof are in the top boom. It is preferably fixed to the base end side.
  • the rod-shaped support member is formed so that a part of the one-stage lower boom extending sheave is disposed inside thereof.
  • the bar-shaped support member is disposed above the top boom-side telescopic cylinder and is formed in a bar shape having a reverse U-shaped cross section.
  • An upper part of the one-stage lower boom extending sheave may be arranged inside.
  • the top boom extension sheave is built into the top boom using a bar-shaped support member. This prevents the top boom extending sheave from interfering with an obstacle during insertion work. Therefore, the telescopic boom telescopic device of the present invention can increase the efficiency of the insertion work.
  • the telescopic device of the telescopic boom of the present invention an telescopic mechanism is used instead of the telescopic cylinder for expanding and contracting the boom one step below the top boom.
  • the number of telescopic cylinders used is reduced by one as compared with the prior art, so that the control of the telescopic operation of the telescopic cylinders can be made easier than before. Therefore, the telescopic boom telescopic device of the present invention can reduce the cost.
  • the telescopic mechanism can be used to simultaneously expand and contract the top boom and the lower boom, thereby eliminating the shock when the boom changes or The number of times can be reduced. Therefore, the telescopic device of the telescopic boom of the present invention can improve the operability of the telescopic boom.
  • the sheave for extending the top boom is disposed on the distal end side of the bar-shaped support member, the bar-shaped support member is formed so as to be built in the top boom, and the base of the bar-shaped support member is formed.
  • a sheave for reducing the top boom is arranged on the end side.
  • the telescopic boom telescopic device of the present invention can reduce the number of assembly steps.
  • the boom extending sheave one step below is disposed in the top boom at the front end side of the top boom side telescopic cylinder, and the rod-shaped support member is connected to the top boom side telescopic cylinder.
  • a part of the sheave for boom extension one step below was arranged inside. This allows a space-saving design in the top boom, so that the top boom placed on the innermost side of the telescopic boom does not need to have a larger cross-sectional area, and other booms also have a cross-sectional area. There is no need to make it larger than necessary.
  • the telescopic boom telescopic device of the present invention can suppress the cross-sectional area of the entire telescopic boom to the minimum necessary. As a result, the weight of the telescopic boom can be reduced, and the manufacturing cost of the telescopic boom can be reduced.
  • FIG. 3 is an enlarged view of a base end side portion of FIG. 2. It is a figure which shows the state which extended the telescopic boom from the state of FIG.
  • FIG. 2 is an enlarged view centering on a sheave for extending a top boom in FIG. 1. It is sectional drawing which shows the state by which the upper part of the sheave for a third boom extension
  • FIG. 9 is a perspective view of a state in which the other end of the third boom extending wire is fixed to the fixing pin in FIG. 8.
  • FIG. 9 is a perspective view of a state in which the other end of the third boom extending wire is fixed to the fixing pin in FIG. 8.
  • FIG. 9 is a perspective view of a state in which the other end of the third boom extending wire is fixed to the fixing pin in FIG. 8.
  • FIG. 9 is a disassembled perspective view which shows the fixation structure of the base end part of the third boom of the same embodiment, and the base end part of a rod-shaped support member.
  • FIG. 1 It is a figure which shows the relationship between the base end part of the expansion-contraction cylinder of the embodiment, and the bottom part of a base boom. It is a perspective view which shows the inside of the base end side of the base boom of the embodiment. It is a disassembled perspective view which shows the state which removed the blocking member in FIG.
  • FIG. 1 is an inner right side surface of the telescopic boom 1 according to an embodiment of the present invention when fully retracted.
  • the telescopic boom 1 is provided on a working machine such as a crane truck or an aerial work platform.
  • the telescopic boom 1 is a four-stage telescopic boom, and includes a boom body 2 and a telescopic device 3 that expands and contracts the boom body 2 by hydraulic pressure.
  • the front side is the distal end side
  • the rear side is the proximal end side. The same applies to the subsequent drawings.
  • the boom body 2 is formed such that four booms are telescopically inserted from the base end side so as to be extendable in the length direction A of the extendable boom 1.
  • the four booms are a base boom 21, a second boom 22, a third boom 23, and a top boom 24 from the base end side.
  • Each boom is formed in a cylindrical shape.
  • the third boom 23 corresponds to a boom that is one step below the top boom 24 in the present invention
  • the second boom 22 corresponds to a boom that is two steps below the top boom 24 in the present invention.
  • the telescopic device 3 includes a telescopic cylinder 4 (top boom side telescopic cylinder) that expands and contracts the second boom 22, and a telescopic mechanism 5 that expands and contracts the third boom 23 and the top boom 24.
  • the telescopic cylinder 4 is disposed in the top boom 24.
  • the telescopic cylinder 4 includes a cylindrical cylinder tube 41, a piston (not shown) that is slidably disposed in the cylinder tube 41, and a cylinder that has one end fixed to the piston and is extracted from the base end of the cylinder tube 41.
  • Rod 42 is a cylindrical cylinder tube 41, a piston (not shown) that is slidably disposed in the cylinder tube 41, and a cylinder that has one end fixed to the piston and is extracted from the base end of the cylinder tube 41.
  • Rod 42 is disposed in the top boom 24.
  • the base end portion 42 a of the cylinder rod 42 is fixed to the base end side of the base boom 21.
  • the cylinder tube 41 is disposed in the top boom 24 with a base end portion 41 a fixed to the base end side of the second boom 22.
  • the cylinder tube 41 is configured to move in the length direction A by hydraulic pressure, and the telescopic cylinder 4 is expanded and contracted by this movement.
  • the telescopic mechanism 5 expands and contracts the third boom 23 and the top boom 24 simultaneously in conjunction with the telescopic operation of the telescopic cylinder 4.
  • the expansion / contraction mechanism 5 includes a rod-shaped support member 10, two extension wire mechanisms, and two reduction wire mechanisms.
  • the rod-shaped support member 10 is for incorporating a below-described top boom extension sheave 71, (71) in the top boom 24.
  • the rod-shaped support member 10 is formed in a rod shape, and is disposed above the cylinder tube 41 in parallel with the cylinder tube 41. Furthermore, this rod-shaped support member 10 is fixed to the base end side in the third boom 23 at one end side and is arranged along the length direction A in the top boom 24. The parenthesized part is not shown because it is on the left side. The same applies to the following description.
  • the bar-shaped support member 10 is formed in an inverted U shape (a U shape opened downward) as shown in FIG.
  • the rod-shaped support member 10 has an upper wall portion 10a and side wall portions 10b and 10b that are bent downward on the left and right sides of the upper wall portion 10a.
  • an upper portion 61a of a third boom extension sheave 61 described later is disposed as shown in FIGS. That is, the upper portion 61 a of the third boom extending sheave 61 is disposed on the inner side 10 s of the rod-shaped support member 10.
  • the two extension wire mechanisms are a third boom extension wire mechanism 6 and a top boom extension wire mechanism 7.
  • the wire mechanism 6 for extending the third boom extends the third boom 23.
  • the third boom extending wire mechanism 6 includes a third boom extending sheave 61 and a plurality of third boom extending wires 62.
  • the third boom extending sheave 61 is fixed to the cylinder tube tip side support portion 11 provided on the tip side of the cylinder tube 41.
  • the third boom extending sheave 61 is located in the bar-shaped support member 10 and is built in the top boom 24.
  • the diameter of the third boom extending sheave 61 is larger than the diameter of the cylinder tube 41. Therefore, the upper part 61 a and the lower part 61 b (see FIGS. 5 and 6) of the third boom extension sheave 61 protrude above and below the upper and lower edges of the cylinder tube 41. Thereby, as described above, the upper portion 61a of the third boom extending sheave 61 is disposed on the inner side 10s of the rod-like support member 10.
  • the third boom extending sheave 61 is arranged such that the rotating shaft (not shown) is horizontal with respect to the cylinder tube tip side support portion 11.
  • the third boom extending sheave 61 may be disposed such that the rotation shaft is inclined with respect to the cylinder tube tip side support portion 11 as long as the third boom extending wire 62 can be hooked.
  • the cylinder tube tip side support part 11 is formed along the length direction A.
  • rollers 11a and (11a) are attached to the left and right. These rollers 11a and (11a) support the telescopic device 3 by moving while contacting the lower side in the boom body 2 when the telescopic boom 1 is expanded and contracted.
  • Each third boom extension wire 62 is hung on a third boom extension sheave 61.
  • One end of each third boom extension wire 62 is fixed to a third boom extension wire one end fixing portion 12 provided below the base end portion 42 a of the cylinder rod 42.
  • the other end of each third boom extension wire 62 is fixed to a third boom extension wire other end fixing portion 13 provided on the base end side in the rod-like support member 10.
  • the top boom extending wire mechanism 7 extends the top boom 24.
  • the top boom extending wire mechanism 7 includes a pair of top boom extending sheaves 71, (71) and a top boom extending wire 72.
  • the pair of top boom extension sheaves 71, (71) are arranged and fixed on the left and right in the rod-like support member distal end side support portion 14 provided on the distal end side of the rod-like support member 10.
  • Each top boom extending sheave 71 is arranged such that a rotating shaft (not shown) is horizontal with respect to the rod-shaped support member 10.
  • Each of the top boom extending sheaves 71 may be disposed such that the rotation shaft is inclined with respect to the rod-shaped support member 10 as long as the top boom extending wire 72 can be hooked.
  • the top boom extending wire 72 is hung on the pair of top boom extending sheaves 71, (71) via the cylinder tube tip side support portion 11 (see FIG. 2). Both ends of the top boom extension wire 72 are fixed to a top boom extension wire fixing portion 15 provided on the upper surface of the base end side in the top boom 24.
  • each top boom extension sheave 71 is such that the rotation center 71 s of the top boom extension sheave 71 is aligned with the length direction of the rod-like support member 10 (the length of the telescopic boom 1).
  • a horizontal line 71t passing in the direction A) is set so as to be positioned near the lower side of the neutral shaft 10t of the rod-shaped support member 10.
  • the arrangement position of each top boom extending sheave 71 may be set so that the horizontal line 71t is positioned in the vicinity of the upper side of the neutral shaft 10t.
  • the neutral shaft 10t is a portion where the rod-shaped support member 10 is not subjected to a load when a bending moment is applied to the rod-shaped support member 10. Since the rod-shaped support member 10 is formed in a rod shape, the neutral shaft 10t normally coincides with the horizontal line 71t. However, since the bar-shaped support member 10 is formed in a U-shaped cross section that opens downward as described above, the strength of the upper portion is increased, and the neutral shaft 10t is positioned above the horizontal line 71t.
  • a roller mounting portion 141 is provided on the distal end side of the rod-shaped support member distal end side support portion 14.
  • Upper rollers 14b and (14b) and lower rollers 14a and (14a) are attached to the upper and lower portions of the roller attaching portion 141, respectively.
  • the upper rollers 14b, (14b) and the lower rollers 14a, (14a) move while contacting the upper and lower sides of the boom body 2 when the telescopic boom 1 is expanded and contracted to support the telescopic device 3.
  • the two reduction wire mechanisms are a third boom reduction wire mechanism 8 and a top boom reduction wire mechanism 9.
  • the third boom reduction wire mechanism 8 reduces the third boom 23.
  • the third boom reduction wire mechanism 8 includes a pair of third boom reduction sheaves 81, (81) and a third boom reduction wire 82.
  • the pair of third boom reduction sheaves 81, (81) are arranged on the left and right sides of the second boom 22 and fixed.
  • the third boom reduction sheaves 81 and (81) are arranged such that the rotation shaft (not shown) is horizontal with respect to the second boom 22.
  • the third boom reduction sheaves 81 and (81) may be arranged such that the rotation axis is inclined with respect to the second boom 22 as long as the third boom reduction wire 82 can be hooked.
  • the third boom reduction wire 82 is hung on a pair of third boom reduction sheaves 81, (81) via a rod-like support member proximal end support portion 16 provided on the proximal end side of the rod-like support member 10. (See FIG. 3). Both ends of the third boom reduction wire 82 are fixed to a third boom reduction wire fixing portion 17 provided on the distal end side of the base boom 21.
  • the top boom reduction wire mechanism 9 reduces the top boom 24.
  • the top boom reduction wire mechanism 9 includes a pair of top boom reduction sheaves 91, (91) and a top boom reduction wire 92.
  • the pair of top boom reduction sheaves 91 and (91) are arranged and fixed to the base end side of the rod-shaped support member 10 on the left and right.
  • top boom reduction sheaves 91 and (91) are arranged such that the rotation shaft (not shown) is horizontal with respect to the rod-shaped support member 10.
  • the top boom reduction sheaves 91, (91) may be arranged such that the rotation shaft is inclined with respect to the rod-shaped support member 10 as long as the top boom reduction wire 92 can be hooked.
  • the top boom reduction wire 92 is hung on the pair of top boom reduction sheaves 91, (91) via the cylinder tube tip side support portion 11 (see FIG. 2). Both ends of the top boom reduction wire 92 are fixed to a top boom reduction wire fixing portion 18 provided on the upper surface of the base end side in the top boom 24.
  • the top boom reducing wire fixing portion 18 is disposed on the base end side with respect to the top boom extending wire fixing portion 15 and faces the top boom extending wire fixing portion 15.
  • the telescopic device 3 of the telescopic boom 1 uses the single telescopic cylinder 4 and the telescopic mechanism 5 to expand and contract the telescopic boom 1.
  • the telescopic mechanism 5 is used instead of the telescopic cylinder in order to expand and contract the third boom 23.
  • the number of telescopic cylinders used is reduced by one from the conventional one, so that the control of the telescopic operation of the telescopic cylinder can be made simpler than before. Therefore, the expansion / contraction apparatus 3 of this Embodiment can achieve cost reduction.
  • the telescopic device 3 of the present embodiment by using the telescopic mechanism 5, the number of telescopic cylinders used is reduced by one from the conventional one, so that each boom can be expanded and contracted simultaneously. It becomes possible to eliminate the shock at the time of changing. Therefore, the telescopic device 3 of the present embodiment can improve the operability of the telescopic boom 1.
  • the top boom extending sheaves 71 and (71) are built in the top boom 24 using the rod-shaped support member 10.
  • the telescopic device 3 can improve the efficiency of the insertion work.
  • the third boom extending sheave 61 is arranged on the cylinder tube tip side support portion 11 and is built in the top boom 24.
  • the telescopic device 3 of the present embodiment can further improve the efficiency of the insertion work.
  • the arrangement position of each sheave 71 for extending the top boom is set so that the horizontal line 71t passing through the rotation center 71s is positioned in the vicinity of the neutral shaft 10t of the rod-shaped support member 10. .
  • the telescopic device 3 can suppress the bending moment applied to the rod-shaped support member 10. Therefore, the cross section of the bar-shaped support member 10 can be set as small as possible, and the installation space for the bar-shaped support member 10 can be reduced. Accordingly, the cross section of the top boom 24 in which the rod-like support member 10 is built can be set small. Therefore, the telescopic device 3 of the present embodiment can set the entire cross section (size) of the telescopic boom 1 to be small, and can achieve weight reduction and cost reduction.
  • the top boom extending sheaves 71 and (71) are arranged on the distal end side of the rod-shaped support member 10 and the rod-shaped support member 10 is formed so as to be built in the top boom 24.
  • the top boom reducing sheaves 91 and (91) are arranged on the base end side of the rod-shaped support member 10.
  • the top boom extension wire 72 and the top boom reduction wire 92 are attached to both sheaves before the telescopic boom 1 is assembled, separately from the telescopic boom 1 or not at the same time as the telescopic boom 1 is assembled. It is possible to adjust the tension by hanging each.
  • the telescopic device 3 can reduce the number of assembly steps.
  • the top boom extension wire 72 is hung on the top boom extension sheaves 71, (71) via the distal end side of the telescopic cylinder 4, and both ends thereof are fixed to the proximal end side in the top boom 24. . For this reason, since the fixing work of the top boom extending wire 72 is performed at the same place, the working efficiency of the fixing operation of the top boom extending wire 72 can be increased.
  • the top boom reduction wire 92 is hung on the top boom reduction sheaves 91, (91) via the distal end side of the telescopic cylinder 4, and both ends thereof are fixed to the proximal end side in the top boom 24. . For this reason, since the fixing work of the top boom reducing wire 92 is performed at the same place, the working efficiency of the fixing work of the top boom reducing wire 92 can be increased.
  • the third boom extending wire 62 is hung on a third boom extending sheave 61 disposed on the distal end side of the telescopic cylinder 4, and both ends thereof are proximal to the telescopic cylinder 4 and the proximal end of the rod-shaped support member 10. It was fixed to the side.
  • This makes it possible to adjust the tension of the third boom extension wire 62 before the telescopic boom 1 is assembled, separately from the telescopic boom 1 assembly, or not simultaneously with the telescopic boom 1 assembly. Accordingly, it is not necessary to adjust the tension of the top boom extending wire 72 and the top boom reducing wire 92 after the telescopic boom 1 is assembled, and it is not necessary to adjust the tension of the third boom extending wire 62. Therefore, the telescopic device 3 of the present embodiment can further reduce the assembly man-hours.
  • the third boom extending sheave 61 is disposed in the top boom 24 at the distal end side (cylinder tube distal end side support portion 11) of the telescopic cylinder 4, and the rod-shaped support member 10 is disposed.
  • the rod-shaped support member 10 was arranged in parallel with the telescopic cylinder 4, and a part (upper part 61a) of the sheave 61 for extending the third boom was arranged on the inner side 10s.
  • the height from the bottom portion (lower portion in FIG. 1) of the cylinder tube 41 to the upper wall portion 10a of the rod-shaped support member 10 is suppressed in the top boom 24, and a space-saving design in the top boom 24 becomes possible. Therefore, the top boom 24 disposed on the innermost side of the telescopic boom 1 does not need to have a larger cross-sectional area than necessary, and the other booms 21 to 23 do not need to have a larger cross-sectional area than necessary. Therefore, the telescopic device 3 of the present embodiment can suppress the cross-sectional area of the entire telescopic boom 1 to the minimum necessary. As a result, the telescopic boom 1 can be reduced in weight, and the manufacturing cost of the telescopic boom 1 can be reduced.
  • the rod-shaped support member 10 is formed in a rod shape whose cross-sectional shape is an inverted U shape. For this reason, it becomes possible to regulate the back-and-forth movement in the left-right direction and the up-down direction when the telescopic cylinder 4 expands and contracts using the inner side 10s of the rod-shaped support member 10. Therefore, the telescopic device 3 according to the present embodiment can regulate the backlash of the distal end portion of the telescopic cylinder 4 with a simple configuration.
  • the rod-like support member 10 has a connecting shaft (fixed pin 101 and third boom connecting pin 110 integrally formed) extending from side to side on the base end side in the third boom 23 at one end side.
  • the other end of each third boom extending wire 62 is fixed to the connecting shaft via the third boom extending wire other end fixing portion 13.
  • each third boom extension wire other end fixing portion 13 is provided at the other end of each third boom extension wire 62. Furthermore, each third boom extending wire other end side fixing portion 13 is formed in a ring shape, and has an insertion hole 13a through which the fixing pin 101 is inserted right and left.
  • the bar-shaped support member base end side support portion 16 is bridged between a pair of support plates 161 and 161 that are provided on the base end side of the bar-shaped support member 10 so as to stand up and left and right, and the support plates 161 and 161. And a folded portion 163 provided on the lower surface of the coupling plate 162 for folding the third boom reduction wire 82.
  • the support plates 161 and 161 are formed so as to protrude further rearward from the left and right side wall portions 10b and 10b on the base end side of the rod-shaped support member 10.
  • Circular pin holes 161 a and 161 a are formed in the support plates 161 and 161.
  • Holding grooves 163a and 163a for holding the third boom reduction wire 82 in a folded state are provided on the left and right sides of the folded portion 163.
  • the fixing pin 101 is formed in a cylindrical shape.
  • the fixing pin 101 is arranged in a state where a plurality of third boom extension wire other end fixing portions 13 are arranged side by side between the support plates 161 and 161, as shown in FIG.
  • Each third boom extension wire other end side fixing portion 13 is fixed by being inserted into the insertion hole 13a of the fixing portion 13. Further, in this state, both end portions of the fixing pin 101 are inserted through the pin holes 161a and 161a.
  • the other end of each third boom extension wire 62 is fixed to the fixing pin 101 via the third boom extension wire other end fixing portion 13.
  • both ends of the fixed pin 101 mounted in the pin holes 161a and 161a are attached to the sheaves 91 for reducing the top boom via ring-shaped spacers S1 and S1, respectively.
  • 91 shaft holes 91a and 91a are passed therethrough.
  • the top boom reducing sheaves 91 and 91 are rotatably supported at both ends of the fixing pin 101.
  • boss portions 102 (102) are formed at the base end portions of the side wall portions 23a, 23a of the third boom 23.
  • Boss holes 102a and (102a) are formed in the boss portions 102 and (102).
  • Third boom connecting pins 110, 110 are inserted into the boss holes 102a, (102a).
  • the third boom connecting pins 110 and 110 are inserted into the holes 101a (see FIG. 8) of the fixing pin 101.
  • the fixed pin 101 is disposed between the third boom connection pins 110 and 110 and is disposed on the same axis as the third boom connection pins 110 and 110 and is integrated.
  • the one end side of the rod-shaped support member 10 is connected to the base end side (side wall) in the third boom 23 via the connecting shaft (the fixed pin 101 and the third boom connecting pins 110 and 110), as shown in FIGS.
  • the base portions of the portions 23a and 23a are fixed.
  • the fixed pin 101 and the third boom connecting pins 110 and 110 are arranged on the same axis, but may not necessarily be on the same axis, and may be connected to a position shifted from the axis of the fixed pin 101.
  • the pins 110 and 110 may be arranged.
  • one end of the rod-shaped support member 10 is connected to the base end side in the third boom 23 via the coupling shaft (fixing pin 101 and third boom coupling pins 110, 110).
  • the other end of the third boom extension wire 62 was fixed to the connecting shaft.
  • the third boom 23 does not need to have a larger cross-sectional area than necessary, and the other booms do not need to have a larger cross-sectional area than necessary. Therefore, the telescopic device 3 of the present embodiment can suppress the cross-sectional area of the entire telescopic boom 1 to the minimum necessary. As a result, the telescopic boom 1 can be reduced in weight, and the manufacturing cost of the telescopic boom 1 can be reduced. Furthermore, since the fixing member can be shared, the number of parts of the expansion / contraction device 3 can be reduced, so that the manufacturing cost of the expansion / contraction device 3 can be further suppressed.
  • the third boom extension wire other end side fixing portion 13 is inserted into the other end of the third boom extension wire 62 and the other end is fixed to the connection shaft. Provided. For this reason, in the manufacture of the telescopic boom 1, the other end of the third boom extending wire 62 can be easily fixed to the connecting shaft. Therefore, the telescopic device 3 according to the present embodiment can increase the work efficiency of the manufacturing work of the telescopic boom 1.
  • the top boom reducing sheaves 91, (91) are provided on the connecting shaft.
  • the fixing members of the top boom reducing sheaves 91 and (91) can also be shared by the connecting shaft, so that the number of parts of the telescopic device 3 can be further reduced. Therefore, the expansion / contraction apparatus 3 of this Embodiment can further suppress manufacturing cost.
  • each third boom extension wire 62 is fixed to a third boom extension wire one end fixing portion 12 provided below the base end portion 42a of the cylinder rod 42. Yes.
  • This fixing structure will be described below.
  • the third boom extension wire one end side fixing portion 12 is provided on one end side fixing member 121 provided on one end of each third boom extension wire 62 and on the lower side of the base end portion 42a of the cylinder rod 42, and on each one end side. And a base end side fixing portion 122 for fixing the fixing member 121.
  • Each one-end-side fixing member 121 is formed in a cylindrical shape, and is arranged along the length direction A of the telescopic boom 1. An opening (not shown) is formed at the front end of each one-end-side fixing member 121. One end of each third boom extension wire 62 is inserted into the one end side fixing member 121 from this opening and fixed. A screw portion 121 a is provided on the outer surface of each one end side fixing member 121.
  • the base end side fixing portion 122 includes a fixing plate 123 provided below the base end portion 42 a of the cylinder rod 42 and a plurality of nuts 124.
  • the fixing plate 123 is provided with a plurality of through holes (not shown) side by side.
  • the one end side fixing member 121 is fitted in each through hole.
  • Each nut 124 is passed through each one-end-side fixing member 121 on the rear side of the fixing plate 123, screwed into the screw portion 121a, and is in contact with the rear surface of the fixing plate 123. By adjusting the tightening degree of each nut 124, the tension of each third boom extending wire 62 can be adjusted.
  • the one end side fixing member 121 and the base end side fixing portion 122 are screwed together so that the tension of the third boom extending wire 62 can be adjusted. For this reason, it is possible to easily adjust the tension of the third boom extension wire 62. Therefore, the telescopic device 3 of the present embodiment can increase the work efficiency of the adjustment operation of the tension of the third boom extension wire 62.
  • the base boom 21 has an inspection hole 211 formed in the bottom 21a at the base end.
  • the inspection hole 211 is used to readjust the tension of the third boom extension wire 62.
  • the closing member 200 includes a closing plate 201 that closes the inspection hole 211, a buckling prevention member 202 provided at the front portion of the upper surface of the closing plate 201, and a reinforcing member 203 provided on the rear surface of the buckling prevention member 202. And.
  • the buckling prevention member 202 is in contact with the front surface of the fixing plate 123 and the rear surface of the standing wall 212 disposed in front of the front surface of the fixing plate 123 in a state where the closing plate 201 closes the inspection hole 211. Is formed.
  • the upright wall 212 is provided upright in front of the front surface of the fixed plate 123 at the bottom 21 a of the base end portion of the base boom 21.
  • the reinforcing member 203 reinforces the buckling prevention member 202.
  • the reinforcing member 203 is provided to extend rearward from the rear surface of the buckling prevention member 202, and is disposed below the fixed plate 123 with the closing plate 201 closing the inspection hole 211.
  • the buckling prevention member 202 comes into contact with the front surface of the fixing plate 123 and the rear surface of the standing wall 212. Even if the third boom extension wire 62 is pulled forward when the cylinder tube 41 is extended in this state, the buckling prevention member 202 presses the fixing plate 123 and absorbs the tension of the third boom extension wire 62. The buckling of the cylinder rod 42 can be prevented.
  • the fixing plate 123 is securely pressed to absorb the tension of the third boom extension wire 62 and the cylinder rod 42 is prevented from buckling. can do.
  • the top boom reducing sheaves 91, (91) are arranged on the proximal end side of the rod-shaped support member 10, but on the proximal end side in the third boom 23 to which the rod-shaped support member 10 is fixed. It may be arranged.
  • each top boom extension sheave 71 is set so that the horizontal line 71t passing through the rotation center 71s is positioned in the vicinity of the neutral shaft 10t of the rod-shaped support member 10. 10 may be set to coincide with the neutral axis 10t.
  • the telescopic device of the present invention is applied to a four-stage telescopic boom.
  • the telescopic device of the present invention can be applied as long as it is a telescopic boom having four or more stages.
  • the telescopic cylinder that constitutes the telescopic device is used to extend and contract the boom that is two steps below the top boom, and the telescopic mechanism that constitutes the telescopic device includes the top boom and the boom one step below. Used to expand and contract.
  • the extension sheave for extending the boom one stage below the top boom is the distal end side of the telescopic cylinder located on the top boom side. It is arranged to be built in the top boom. Further, the sheave for reducing the top boom is disposed on the base end side (for example, the base end side of the bar-shaped support member) in the boom one step below the top boom, and is used for reducing the boom one step below the top boom. The sheave is arranged on the base end side in the boom two steps below the top boom.
  • the rod-shaped support member 10 is arrange
  • the cross-sectional shape of the rod-shaped support member 10 is formed in a U shape, and the lower portion 61b (see FIGS. 8 and 9) of the third boom extension sheave 61 is disposed on the inner side 10s.
  • the rod-shaped support member 10 has a shape having a bottom.
  • the rod-shaped support member has a shape that does not have a bottom, for example, a shape in which the rod-shaped support member is divided into left and right. You may use things. In this case, even if the boom extending sheave one step below is overlapped inside the rod-shaped support member when viewed from the side, a part of the boom extending sheave one step below is disposed inside the rod-shaped support member. It may be said that is arranged.

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Abstract

Provided is an extension and retraction device for a telescopic boom, the extension and retraction device being configured so that the extension and retraction device is of low cost, can improve the operability of the telescopic boom, and can increase the efficiency of insertion work. An extension and retraction device (3) for a telescopic boom (1) is provided with: an extension and retraction cylinder (4) for extending and retracting a second boom (22); and an extension and retraction mechanism (5) for simultaneously extending and retracting a top boom (24) and a third boom (23) in coordination with the extension and retraction movement of the extension and retraction cylinder (4). The extension and retraction mechanism (5) is provided with a rod-shaped support member (10). The rod-shaped support member (10) is disposed within the top boom (24) with one end of the rod-shaped support member (10) affixed, within the third boom (23), to the base end side of the third boom (23). The rod-shaped support member (10) is formed in such a manner that sheaves (71, 71) for extending the top boom are provided within the top boom (24) and located on the front end side of the rod-shaped support member (10).

Description

伸縮ブームの伸縮装置Telescopic boom telescopic device
　本発明は、クレーン車、高所作業車等の作業機に設けられる４段式以上の伸縮ブームの伸縮に使用される伸縮装置に関する。 The present invention relates to a telescopic device used for expansion and contraction of a four-stage or more telescopic boom provided in a working machine such as a crane truck or an aerial work platform.
　従来、クレーン車、高所作業車等の作業機に設けられる伸縮ブームの中で４段式以上の伸縮ブームの伸縮に使用される伸縮装置としては、例えば特許文献１に開示されているような伸縮装置が提案されている。 Conventionally, as an expansion / contraction device used for expansion / contraction of a telescopic boom having four or more stages among expansion / contraction booms provided in a working machine such as a crane truck or an aerial work vehicle, for example, as disclosed in Patent Document 1 Telescopic devices have been proposed.
　この伸縮装置は、トップブーム以外の複数のブームを伸縮する少なくとも２本の伸縮シリンダと、少なくとも２本の伸縮シリンダの内でトップブーム側の伸縮シリンダの伸縮動作に連動してトップブームを伸縮する伸縮機構とを備えている。この伸縮機構には、２つのシーブ（伸長用シーブと縮小用シーブ）と２本のワイヤ（伸長用ワイヤと縮小用ワイヤ）が使用されている。 The telescopic device expands and contracts the top boom in conjunction with the telescopic operation of the telescopic cylinder on the top boom side in at least two telescopic cylinders and at least two telescopic cylinders that extend and contract a plurality of booms other than the top boom. And a telescopic mechanism. In this telescopic mechanism, two sheaves (extension sheave and reduction sheave) and two wires (extension wire and reduction wire) are used.
実公昭６３－０３８２１９号公報Japanese Utility Model Publication No. 63-038219
　しかしながら、従来の伸縮装置では、伸長用シーブがサードブームの先端に固定されるような場合は、差し込み作業において障害物に干渉して損傷する場合がある。したがって、差し込み作業の効率が良くない。なお、差し込み作業とは、建物内部へ吊荷を搬入するときや、造園作業において木の枝が密集している現場等で伸縮ブームを伸長させる作業のことである。 However, in the conventional telescopic device, when the extension sheave is fixed to the tip of the third boom, it may be damaged by interfering with an obstacle in the insertion work. Therefore, the efficiency of insertion work is not good. The insertion work refers to an operation of extending the telescopic boom when carrying a suspended load into the building or at a site where tree branches are dense in a landscaping operation.
　また、従来の伸縮装置では、少なくとも２本の伸縮シリンダを使用するために、伸縮シリンダの伸縮制御が複雑になりコスト高になる。 Also, in the conventional expansion / contraction apparatus, since at least two expansion / contraction cylinders are used, the expansion / contraction control of the expansion / contraction cylinder becomes complicated and the cost increases.
　また、伸縮時には各伸縮シリンダが順に伸縮していくため、伸縮シリンダの切り替わり時には伸縮ブームの伸縮速度が変化して伸縮ブームにショック（ブームの段替わり時のショック）が生じてしまう。したがって、伸縮ブームの操作性が良くない。 In addition, since each telescopic cylinder expands and contracts in turn during expansion and contraction, the expansion and contraction speed of the telescopic boom changes when the expansion and contraction cylinder switches, and a shock (shock when the boom changes) occurs. Therefore, the operability of the telescopic boom is not good.
　本発明は、このような従来の課題に鑑みてなされたものであり、低コスト化を図りつつ伸縮ブームの操作性を改善することができ、且つ、差し込み作業の効率化を図ることができる伸縮ブームの伸縮装置を提供することを目的とする。 The present invention has been made in view of such a conventional problem, and is capable of improving the operability of the telescopic boom while reducing the cost and increasing the efficiency of the insertion work. An object is to provide a boom telescopic device.
　本発明者等は、鋭意研究の結果、前記課題を解決するために以下のような伸縮ブームの伸縮装置を採用した。 As a result of earnest research, the present inventors have adopted the following telescopic boom telescopic devices in order to solve the above problems.
　本発明の伸縮ブームの伸縮装置は、作業機に設けられる４段式以上の伸縮ブームの伸縮に使用される伸縮ブームの伸縮装置であって、
　全縮時にトップブーム内に配置されて前記トップブームの２段下以降のブームを伸縮する少なくとも１本の伸縮シリンダと、当該少なくとも１本の伸縮シリンダの内で前記トップブーム側に位置するトップブーム側伸縮シリンダの伸縮動作に連動して前記トップブームおよびその１段下のブームを同時に伸縮する伸縮機構とを備え、
　前記伸縮機構は、前記１段下のブーム内の基端側に一端側が固定されて前記トップブーム内に配置される棒状サポート部材を備え、当該棒状サポート部材は、その先端側に前記トップブームを伸長するためのトップブーム伸長用シーブを配置して前記トップブームに内蔵するように形成されていることを特徴とする。 The telescopic boom telescopic device of the present invention is an telescopic boom telescopic device used for telescopic expansion and contraction of a four-stage or more telescopic boom provided in a working machine,
At least one telescopic cylinder that is disposed in the top boom at the time of full contraction and expands / contracts the boom that is two or lower steps below the top boom, and the top boom that is located on the top boom side in the at least one telescopic cylinder A telescopic mechanism that simultaneously expands and contracts the top boom and its lower boom in conjunction with the expansion and contraction operation of the side expansion cylinder;
The telescopic mechanism includes a bar-like support member that is fixed at one end side to the base end side in the lower boom and disposed in the top boom, and the bar-like support member has the top boom at the tip side thereof. A top boom elongating sheave for elongating is arranged to be built in the top boom.
　また、本発明の伸縮ブームの伸縮装置において、前記トップブーム側伸縮シリンダの先端側に、前記１段下のブームを伸長するための１段下のブーム伸長用シーブを前記トップブームに内蔵するように配置することが好ましい。 In the telescopic boom telescopic device of the present invention, a boom lowering sheave for extending the lower boom is incorporated in the top boom at the distal end of the top boom side telescopic cylinder. It is preferable to arrange in.
　さらに、本発明の伸縮ブームの伸縮装置において、前記トップブームを縮小するためのトップブーム縮小用シーブを前記１段下のブーム内の基端側に配置することが好ましい。 Furthermore, in the telescopic device of the telescopic boom of the present invention, it is preferable that a top boom reducing sheave for contracting the top boom is disposed on the base end side in the lower boom.
　また、本発明の伸縮ブームの伸縮装置において、前記１段下のブーム内の基端側で前記棒状サポート部材の基端側に前記トップブーム縮小用シーブを配置することが好ましい。 Further, in the telescopic boom telescopic device of the present invention, it is preferable that the top boom reducing sheave is disposed on the base end side of the rod-shaped support member on the base end side in the one-stage lower boom.
　また、本発明の伸縮ブームの伸縮装置において、前記トップブーム伸長用シーブの前記棒状サポート部材に対する配置位置は、前記トップブーム伸長用シーブの回転中心を前記棒状サポート部材の長さ方向に通る水平線が、前記棒状サポート部材の中立軸と一致または当該中立軸の近傍に位置するように設定されていることが好ましい。 In the telescopic boom telescopic device of the present invention, the position of the top boom extending sheave with respect to the bar-shaped support member is such that a horizontal line passing through the rotation center of the top boom extending sheave in the length direction of the bar-shaped support member. The rod-shaped support member is preferably set so as to coincide with the neutral axis or to be positioned in the vicinity of the neutral axis.
　また、本発明の伸縮ブームの伸縮装置において、前記トップブーム伸長用シーブは、前記棒状サポート部材の先端側に左右一対に配置されたものであり、当該一対のトップブーム伸長用シーブとともに前記トップブームを伸長するために使用されるトップブーム伸長用ワイヤは、当該一対のトップブーム伸長用シーブに前記トップブーム側伸縮シリンダの先端側を介して掛けられて、その両端が、前記トップブーム内の基端側に固定されていることが好ましい。 In the telescopic device of the telescopic boom according to the present invention, the top boom extending sheaves are arranged in a pair of left and right on the distal end side of the rod-like support member, and together with the pair of top boom extending sheaves, the top boom The top boom extension wire used for extending the hook is hung on the pair of top boom extension sheaves via the tip side of the top boom side telescopic cylinder, and both ends thereof are connected to the base in the top boom. It is preferable to be fixed to the end side.
　また、本発明の伸縮ブームの伸縮装置において、前記トップブーム縮小用シーブは、前記棒状サポート部材の基端側に左右一対に配置されたものであり、当該一対のトップブーム縮小用シーブとともに前記トップブームを縮小するために使用されるトップブーム縮小用ワイヤは、当該一対のトップブーム縮小用シーブに前記トップブーム側伸縮シリンダの先端側を介して掛けられて、その両端が、前記トップブーム内の基端側に固定されていることが好ましい。 In the telescopic device for a telescopic boom according to the present invention, the sheaves for reducing the top boom are arranged in a pair of left and right on the base end side of the rod-shaped support member, and the top boom together with the pair of top boom reducing sheaves. A top boom reduction wire used to reduce the boom is hung on the pair of top boom reduction sheaves via the distal end side of the top boom side telescopic cylinder, and both ends thereof are in the top boom. It is preferably fixed to the base end side.
　また、本発明の伸縮ブームの伸縮装置において、前記棒状サポート部材は、その内側に前記１段下のブーム伸長用シーブの一部が配置されるように形成されていることが好ましい。 Further, in the telescopic device of the telescopic boom according to the present invention, it is preferable that the rod-shaped support member is formed so that a part of the one-stage lower boom extending sheave is disposed inside thereof.
　さらに、本発明の伸縮ブームの伸縮装置において、前記棒状サポート部材は、前記トップブーム側伸縮シリンダの上方に配置されて、断面形状が逆Ｕ字状である棒状に形成され、当該棒状サポート部材の内側には前記１段下のブーム伸長用シーブの上部が配置されているようにしても良い。 Furthermore, in the telescopic device of the telescopic boom according to the present invention, the bar-shaped support member is disposed above the top boom-side telescopic cylinder and is formed in a bar shape having a reverse U-shaped cross section. An upper part of the one-stage lower boom extending sheave may be arranged inside.
　本発明の伸縮ブームの伸縮装置では、棒状サポート部材を使用してトップブーム伸長用シーブをトップブームに内蔵するようにした。これにより差し込み作業時にはトップブーム伸長用シーブが障害物に干渉することがなくなる。よって、本発明の伸縮ブームの伸縮装置は、差し込み作業の効率化を図ることができる。 In the telescopic boom telescopic device of the present invention, the top boom extension sheave is built into the top boom using a bar-shaped support member. This prevents the top boom extending sheave from interfering with an obstacle during insertion work. Therefore, the telescopic boom telescopic device of the present invention can increase the efficiency of the insertion work.
　さらに、本発明の伸縮ブームの伸縮装置では、トップブームの１段下のブームを伸縮するための伸縮シリンダの代わりに伸縮機構を使用した。これにより伸縮シリンダの使用本数が従来よりも１本減少するため、伸縮シリンダの伸縮動作の制御を従来よりも簡単にすることが可能になる。よって、本発明の伸縮ブームの伸縮装置は、低コスト化を図ることができる。 Furthermore, in the telescopic device of the telescopic boom of the present invention, an telescopic mechanism is used instead of the telescopic cylinder for expanding and contracting the boom one step below the top boom. As a result, the number of telescopic cylinders used is reduced by one as compared with the prior art, so that the control of the telescopic operation of the telescopic cylinders can be made easier than before. Therefore, the telescopic boom telescopic device of the present invention can reduce the cost.
　また、本発明の伸縮ブームの伸縮装置では、伸縮機構を使用することによりトップブームおよびその１段下のブームの同時伸縮が可能となるので、ブームの段替わり時のショックをなくす、またはショックの回数を減らすことが可能になる。よって、本発明の伸縮ブームの伸縮装置は、伸縮ブームの操作性を改善することができる。 Furthermore, in the telescopic boom telescopic device of the present invention, the telescopic mechanism can be used to simultaneously expand and contract the top boom and the lower boom, thereby eliminating the shock when the boom changes or The number of times can be reduced. Therefore, the telescopic device of the telescopic boom of the present invention can improve the operability of the telescopic boom.
　さらに、本発明の伸縮ブームの伸縮装置では、棒状サポート部材の先端側にトップブーム伸長用シーブを配置して、その棒状サポート部材をトップブームに内蔵するように形成し、その棒状サポート部材の基端側にトップブーム縮小用シーブを配置した。これにより伸縮ブームの組立前、あるいは伸縮ブームの組立とは別に、または伸縮ブームの組立と同時でなくても、双方のシーブにトップブーム伸長用ワイヤとトップブーム縮小用ワイヤをそれぞれ掛けてテンションの調整をすることが可能になる。つまり、伸縮ブームの組立時に双方のワイヤを配索しなくても良いため、双方のワイヤが損傷しないように注意しながら組み立てを行う必要がなく、伸縮ブームの組立後に双方のワイヤのテンションを調整する必要もなくなる。よって、本発明の伸縮ブームの伸縮装置は、組立工数の低減化を図ることができる。 Furthermore, in the telescopic device of the telescopic boom according to the present invention, the sheave for extending the top boom is disposed on the distal end side of the bar-shaped support member, the bar-shaped support member is formed so as to be built in the top boom, and the base of the bar-shaped support member is formed. A sheave for reducing the top boom is arranged on the end side. As a result, before assembling the telescopic boom, separately from the telescopic boom assembly, or not simultaneously with the telescopic boom assembly, the top boom extension wire and the top boom reduction wire are hung on both sheaves, respectively. Adjustments can be made. In other words, it is not necessary to route both wires when assembling the telescopic boom, so there is no need to assemble while paying attention not to damage both wires, and the tension of both wires is adjusted after the telescopic boom is assembled. There is no need to do this. Therefore, the telescopic boom telescopic device of the present invention can reduce the number of assembly steps.
　さらに、本発明の伸縮ブームの伸縮装置では、トップブーム側伸縮シリンダの先端側に１段下のブーム伸長用シーブをトップブームに内蔵するように配置し、棒状サポート部材をトップブーム側伸縮シリンダと平行に配置し、その内側に１段下のブーム伸長用シーブの一部が配置されるように形成した。これにより、トップブーム内の省スペース設計が可能になるので、伸縮ブームの中で一番内側に配置されるトップブームは断面積を必要以上に大きくする必要がなくなり、その他のブームも断面積を必要以上に大きくする必要がなくなる。よって、本発明の伸縮ブームの伸縮装置は、伸縮ブーム全体の断面積を必要最小限に抑えることができる。その結果、伸縮ブームの軽量化を図ることができ、伸縮ブームの製造コストも抑えることができる。 Furthermore, in the telescopic boom telescopic device of the present invention, the boom extending sheave one step below is disposed in the top boom at the front end side of the top boom side telescopic cylinder, and the rod-shaped support member is connected to the top boom side telescopic cylinder. Arranged in parallel, a part of the sheave for boom extension one step below was arranged inside. This allows a space-saving design in the top boom, so that the top boom placed on the innermost side of the telescopic boom does not need to have a larger cross-sectional area, and other booms also have a cross-sectional area. There is no need to make it larger than necessary. Therefore, the telescopic boom telescopic device of the present invention can suppress the cross-sectional area of the entire telescopic boom to the minimum necessary. As a result, the weight of the telescopic boom can be reduced, and the manufacturing cost of the telescopic boom can be reduced.
本発明の一実施の形態の伸縮ブームの全縮時の内部の右側面である。It is an internal right side surface at the time of full contraction of the telescopic boom of one embodiment of the present invention. 同実施の形態の伸縮装置の斜視図である。It is a perspective view of the expansion-contraction apparatus of the embodiment. 図２の基端側の部分の拡大図である。FIG. 3 is an enlarged view of a base end side portion of FIG. 2. 図１の状態から伸縮ブームを全伸した状態を示す図である。It is a figure which shows the state which extended the telescopic boom from the state of FIG. 図１においてトップブーム伸長用シーブを中心とした拡大図である。FIG. 2 is an enlarged view centering on a sheave for extending a top boom in FIG. 1. 同実施の形態の棒状サポート部材の内側にサードブーム伸長用シーブの上部が配置されている状態を示す断面図である。It is sectional drawing which shows the state by which the upper part of the sheave for a third boom extension | expansion is arrange | positioned inside the rod-shaped support member of the embodiment. 同実施の形態の棒状サポート部材の内側にサードブーム伸長用シーブの上部が配置されている状態を示す斜視図である。It is a perspective view which shows the state by which the upper part of the sheave for a third boom extension | expansion is arrange | positioned inside the rod-shaped support member of the embodiment. 図３において棒状サポート部材の基端部の構造を示す分解斜視図である。It is a disassembled perspective view which shows the structure of the base end part of a rod-shaped support member in FIG. 図８において固定ピンにサードブーム伸長用ワイヤの他端を固定した状態の斜視図である。FIG. 9 is a perspective view of a state in which the other end of the third boom extending wire is fixed to the fixing pin in FIG. 8. 同実施の形態のサードブームの基端部と棒状サポート部材の基端部との固定構造を示す分解斜視図である。It is a disassembled perspective view which shows the fixation structure of the base end part of the third boom of the same embodiment, and the base end part of a rod-shaped support member. 同実施の形態のサードブームの基端部を示す斜視図である。It is a perspective view which shows the base end part of the third boom of the embodiment. 同実施の形態の伸縮シリンダの基端部とベースブームの底部との関係を示す図である。It is a figure which shows the relationship between the base end part of the expansion-contraction cylinder of the embodiment, and the bottom part of a base boom. 同実施の形態のベースブームの基端側の内部を示す斜視図である。It is a perspective view which shows the inside of the base end side of the base boom of the embodiment. 図１３において閉塞部材を外した状態を示す分解斜視図である。It is a disassembled perspective view which shows the state which removed the blocking member in FIG.
　以下、本発明の実施の形態を４段式の伸縮ブームを例に図にしたがって説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings, taking a four-stage telescopic boom as an example.
　図１は、本発明の一実施の形態の伸縮ブーム１の全縮時の内部の右側面である。この伸縮ブーム１は、クレーン車、高所作業車等の作業機に設けられるものである。また、この伸縮ブーム１は４段式の伸縮ブームであり、ブーム本体２と、ブーム本体２を油圧により伸縮する伸縮装置３とを備えている。なお、図１の伸縮ブーム１において前側が先端側、後側が基端側である。以降の各図面においても同様である。 FIG. 1 is an inner right side surface of the telescopic boom 1 according to an embodiment of the present invention when fully retracted. The telescopic boom 1 is provided on a working machine such as a crane truck or an aerial work platform. The telescopic boom 1 is a four-stage telescopic boom, and includes a boom body 2 and a telescopic device 3 that expands and contracts the boom body 2 by hydraulic pressure. In the telescopic boom 1 shown in FIG. 1, the front side is the distal end side, and the rear side is the proximal end side. The same applies to the subsequent drawings.
　ブーム本体２は、４本のブームが基端側から入れ子式に挿入されて伸縮ブーム１の長さ方向Ａに伸縮可能に形成されている。４本のブームは、基端側から、ベースブーム２１、セカンドブーム２２、サードブーム２３、トップブーム２４である。各ブームは筒状に形成されている。なお、サードブーム２３は本発明においてトップブーム２４の１段下のブームに相当し、セカンドブーム２２は本発明においてトップブーム２４の２段下以降のブームに相当する。 The boom body 2 is formed such that four booms are telescopically inserted from the base end side so as to be extendable in the length direction A of the extendable boom 1. The four booms are a base boom 21, a second boom 22, a third boom 23, and a top boom 24 from the base end side. Each boom is formed in a cylindrical shape. The third boom 23 corresponds to a boom that is one step below the top boom 24 in the present invention, and the second boom 22 corresponds to a boom that is two steps below the top boom 24 in the present invention.
　伸縮装置３は、セカンドブーム２２を伸縮する伸縮シリンダ４（トップブーム側伸縮シリンダ）と、サードブーム２３とトップブーム２４を伸縮する伸縮機構５とを備えている。 The telescopic device 3 includes a telescopic cylinder 4 (top boom side telescopic cylinder) that expands and contracts the second boom 22, and a telescopic mechanism 5 that expands and contracts the third boom 23 and the top boom 24.
　伸縮シリンダ４は、トップブーム２４内に配置されている。この伸縮シリンダ４は、筒状のシリンダチューブ４１と、シリンダチューブ４１内にスライド自在に配置されたピストン（図示せず）と、ピストンに一端が固定されてシリンダチューブ４１の基端から抜出したシリンダロッド４２とを備えている。 The telescopic cylinder 4 is disposed in the top boom 24. The telescopic cylinder 4 includes a cylindrical cylinder tube 41, a piston (not shown) that is slidably disposed in the cylinder tube 41, and a cylinder that has one end fixed to the piston and is extracted from the base end of the cylinder tube 41. Rod 42.
　シリンダロッド４２は、基端部４２ａがベースブーム２１の基端側に固定されている。シリンダチューブ４１は、基端部４１ａがセカンドブーム２２の基端側に固定されてトップブーム２４内に配置されている。このシリンダチューブ４１は油圧により長さ方向Ａに移動し、この移動により伸縮シリンダ４が伸縮するように構成されている。 The base end portion 42 a of the cylinder rod 42 is fixed to the base end side of the base boom 21. The cylinder tube 41 is disposed in the top boom 24 with a base end portion 41 a fixed to the base end side of the second boom 22. The cylinder tube 41 is configured to move in the length direction A by hydraulic pressure, and the telescopic cylinder 4 is expanded and contracted by this movement.
　伸縮機構５は、伸縮シリンダ４の伸縮動作に連動してサードブーム２３とトップブーム２４を同時に伸縮するものである。この伸縮機構５は、棒状サポート部材１０と、２つの伸長用ワイヤ機構と、２つの縮小用ワイヤ機構とを備えている。 The telescopic mechanism 5 expands and contracts the third boom 23 and the top boom 24 simultaneously in conjunction with the telescopic operation of the telescopic cylinder 4. The expansion / contraction mechanism 5 includes a rod-shaped support member 10, two extension wire mechanisms, and two reduction wire mechanisms.
［棒状サポート部材１０］
　最初に、図１を用いて棒状サポート部材１０について説明する。棒状サポート部材１０は、後述のトップブーム伸長用シーブ７１，（７１）をトップブーム２４に内蔵するためのものである。この棒状サポート部材１０は、棒状に形成され、シリンダチューブ４１の上方にシリンダチューブ４１と平行に配置されている。さらに、この棒状サポート部材１０は、一端側がサードブーム２３内の基端側に固定され、トップブーム２４内に長さ方向Ａに沿うように配置されている。なお、カッコ書きの部分は左側にあるため図示していない。以下の説明においても同様である。 [Bar-shaped support member 10]
First, the rod-shaped support member 10 will be described with reference to FIG. The rod-shaped support member 10 is for incorporating a below-described top boom extension sheave 71, (71) in the top boom 24. The rod-shaped support member 10 is formed in a rod shape, and is disposed above the cylinder tube 41 in parallel with the cylinder tube 41. Furthermore, this rod-shaped support member 10 is fixed to the base end side in the third boom 23 at one end side and is arranged along the length direction A in the top boom 24. The parenthesized part is not shown because it is on the left side. The same applies to the following description.
　また、棒状サポート部材１０は、断面形状が図６に示すように逆Ｕ字状（下方に開口したＵ字状）に形成されている。このため、棒状サポート部材１０は、上壁部１０ａと、この上壁部１０ａの左右側に下方へ折曲形成された側壁部１０ｂ,１０ｂとを有している。 Further, the bar-shaped support member 10 is formed in an inverted U shape (a U shape opened downward) as shown in FIG. For this reason, the rod-shaped support member 10 has an upper wall portion 10a and side wall portions 10b and 10b that are bent downward on the left and right sides of the upper wall portion 10a.
　棒状サポート部材１０の左右の側壁部１０ｂ，１０ｂの間には、図６と図７に示すように後述のサードブーム伸長用シーブ６１の上部６１ａが配置されている。すなわち、棒状サポート部材１０の内側１０ｓにはサードブーム伸長用シーブ６１の上部６１ａが配置されている。 Between the left and right side wall portions 10b, 10b of the rod-like support member 10, an upper portion 61a of a third boom extension sheave 61 described later is disposed as shown in FIGS. That is, the upper portion 61 a of the third boom extending sheave 61 is disposed on the inner side 10 s of the rod-shaped support member 10.
［２つの伸長用ワイヤ機構］
　次に、図１～図３を用いて２つの伸長用ワイヤ機構について説明する。２つの伸長用ワイヤ機構は、サードブーム伸長用ワイヤ機構６とトップブーム伸長用ワイヤ機構７である。 [Two extension wire mechanisms]
Next, the two extension wire mechanisms will be described with reference to FIGS. The two extension wire mechanisms are a third boom extension wire mechanism 6 and a top boom extension wire mechanism 7.
　サードブーム伸長用ワイヤ機構６は、サードブーム２３を伸長するものである。このサードブーム伸長用ワイヤ機構６は、サードブーム伸長用シーブ６１と、複数のサードブーム伸長用ワイヤ６２とを備えている。 The wire mechanism 6 for extending the third boom extends the third boom 23. The third boom extending wire mechanism 6 includes a third boom extending sheave 61 and a plurality of third boom extending wires 62.
　サードブーム伸長用シーブ６１は、シリンダチューブ４１の先端側に設けられたシリンダチューブ先端側支持部１１に固定されている。このサードブーム伸長用シーブ６１は棒状サポート部材１０内に位置しており、トップブーム２４に内蔵されている。 The third boom extending sheave 61 is fixed to the cylinder tube tip side support portion 11 provided on the tip side of the cylinder tube 41. The third boom extending sheave 61 is located in the bar-shaped support member 10 and is built in the top boom 24.
　サードブーム伸長用シーブ６１の直径は、シリンダチューブ４１の直径よりも大きく形成されている。したがって、サードブーム伸長用シーブ６１の上部６１ａと下部６１ｂ（図５、図６参照）は、シリンダチューブ４１の上縁および下縁よりも上下に突出している。これにより、前述したようにサードブーム伸長用シーブ６１の上部６１ａが棒状サポート部材１０の内側１０ｓに配置されている。 The diameter of the third boom extending sheave 61 is larger than the diameter of the cylinder tube 41. Therefore, the upper part 61 a and the lower part 61 b (see FIGS. 5 and 6) of the third boom extension sheave 61 protrude above and below the upper and lower edges of the cylinder tube 41. Thereby, as described above, the upper portion 61a of the third boom extending sheave 61 is disposed on the inner side 10s of the rod-like support member 10.
　また、サードブーム伸長用シーブ６１は、回転軸（図示せず）が、シリンダチューブ先端側支持部１１に対して水平になるように配置されている。なお、サードブーム伸長用シーブ６１は、サードブーム伸長用ワイヤ６２が掛けられることが可能な範囲で、回転軸がシリンダチューブ先端側支持部１１に対して傾いて配置されても良い。 Further, the third boom extending sheave 61 is arranged such that the rotating shaft (not shown) is horizontal with respect to the cylinder tube tip side support portion 11. The third boom extending sheave 61 may be disposed such that the rotation shaft is inclined with respect to the cylinder tube tip side support portion 11 as long as the third boom extending wire 62 can be hooked.
　シリンダチューブ先端側支持部１１は、長さ方向Ａに沿って形成されている。このシリンダチューブ先端側支持部１１の先端部の下側には、左右にローラ１１ａ，（１１ａ）が取り付けられている。このローラ１１ａ，（１１ａ）は、伸縮ブーム１の伸縮時にブーム本体２内の下側を接触しながら移動して伸縮装置３を支持するものである。 The cylinder tube tip side support part 11 is formed along the length direction A. On the lower side of the distal end portion of the cylinder tube distal end side support portion 11, rollers 11a and (11a) are attached to the left and right. These rollers 11a and (11a) support the telescopic device 3 by moving while contacting the lower side in the boom body 2 when the telescopic boom 1 is expanded and contracted.
　各サードブーム伸長用ワイヤ６２は、サードブーム伸長用シーブ６１に掛けられている。各サードブーム伸長用ワイヤ６２の一端は、シリンダロッド４２の基端部４２ａの下側に設けられたサードブーム伸長用ワイヤ一端側固定部１２に固定されている。また、各サードブーム伸長用ワイヤ６２の他端は、棒状サポート部材１０内の基端側に設けられたサードブーム伸長用ワイヤ他端側固定部１３に固定されている。 Each third boom extension wire 62 is hung on a third boom extension sheave 61. One end of each third boom extension wire 62 is fixed to a third boom extension wire one end fixing portion 12 provided below the base end portion 42 a of the cylinder rod 42. The other end of each third boom extension wire 62 is fixed to a third boom extension wire other end fixing portion 13 provided on the base end side in the rod-like support member 10.
　トップブーム伸長用ワイヤ機構７は、トップブーム２４を伸長するものである。このトップブーム伸長用ワイヤ機構７は、一対のトップブーム伸長用シーブ７１，（７１）と、トップブーム伸長用ワイヤ７２とを備えている。 The top boom extending wire mechanism 7 extends the top boom 24. The top boom extending wire mechanism 7 includes a pair of top boom extending sheaves 71, (71) and a top boom extending wire 72.
　一対のトップブーム伸長用シーブ７１，（７１）は、棒状サポート部材１０の先端側に
設けられた棒状サポート部材先端側支持部１４において左右に配置されて固定されている。各トップブーム伸長用シーブ７１は、回転軸（図示せず）が、棒状サポート部材１０に対して水平になるように配置されている。なお、各トップブーム伸長用シーブ７１は、トップブーム伸長用ワイヤ７２が掛けられることが可能な範囲で、回転軸が棒状サポート部材１０に対して傾いて配置されても良い。 The pair of top boom extension sheaves 71, (71) are arranged and fixed on the left and right in the rod-like support member distal end side support portion 14 provided on the distal end side of the rod-like support member 10. Each top boom extending sheave 71 is arranged such that a rotating shaft (not shown) is horizontal with respect to the rod-shaped support member 10. Each of the top boom extending sheaves 71 may be disposed such that the rotation shaft is inclined with respect to the rod-shaped support member 10 as long as the top boom extending wire 72 can be hooked.
　トップブーム伸長用ワイヤ７２は、一対のトップブーム伸長用シーブ７１，（７１）にシリンダチューブ先端側支持部１１を介して掛けられている（図２参照）。トップブーム伸長用ワイヤ７２の両端は、トップブーム２４内の基端側の上面に設けられたトップブーム伸長用ワイヤ固定部１５に固定されている。 The top boom extending wire 72 is hung on the pair of top boom extending sheaves 71, (71) via the cylinder tube tip side support portion 11 (see FIG. 2). Both ends of the top boom extension wire 72 are fixed to a top boom extension wire fixing portion 15 provided on the upper surface of the base end side in the top boom 24.
　次に、２つの伸長用ワイヤ機構と伸縮シリンダ４を利用した伸縮ブーム１の全伸動作（図１→図４）について説明する。 Next, the full extension operation (FIG. 1 → FIG. 4) of the telescopic boom 1 using the two wire mechanisms for extension and the telescopic cylinder 4 will be described.
（１）セカンドブーム２２の伸長
　油圧によりシリンダチューブ４１が伸縮ブーム１の先端側に移動する。これにより、シリンダチューブ４１が固定されているセカンドブーム２２が先端側に移動して伸ばされる。 (1) Extension of the second boom 22 The cylinder tube 41 moves to the distal end side of the telescopic boom 1 by hydraulic pressure. As a result, the second boom 22 to which the cylinder tube 41 is fixed moves to the distal end side and is extended.
（２）サードブーム２３の伸長
　シリンダチューブ４１が先端側に移動すると、シリンダチューブ４１の先端側に固定されているサードブーム伸長用シーブ６１も先端側へ移動する。
　ここで、サードブーム伸長用シーブ６１に掛けられているサードブーム伸長用ワイヤ６２の両端は、シリンダロッド４２の基端部４２ａと、棒状サポート部材１０内の基端側とに固定されている。
　したがって、サードブーム伸長用シーブ６１が先端側へ移動しても、サードブーム伸長用ワイヤ６２は、一端がシリンダロッド４２の基端部４２ａに固定されたままなので、もう一端で棒状サポート部材１０を先端側に引っ張る。これにより棒状サポート部材１０は先端側に移動する。これに伴い、棒状サポート部材１０が固定されているサードブーム２３が先端側に移動して伸ばされる。 (2) Extension of the third boom 23 When the cylinder tube 41 moves to the tip side, the third boom extension sheave 61 fixed to the tip side of the cylinder tube 41 also moves to the tip side.
Here, both ends of the third boom extension wire 62 hung on the third boom extension sheave 61 are fixed to the base end portion 42 a of the cylinder rod 42 and the base end side in the rod-shaped support member 10.
Therefore, even if the third boom extension sheave 61 moves to the distal end side, the third boom extension wire 62 remains fixed at the base end portion 42a of the cylinder rod 42, so that the rod-like support member 10 is held at the other end. Pull to the tip side. Thereby, the rod-shaped support member 10 moves to the front end side. Along with this, the third boom 23 to which the rod-like support member 10 is fixed moves to the distal end side and is extended.
（３）トップブーム２４の伸長
　棒状サポート部材１０が先端側に移動すると、棒状サポート部材１０の先端側に固定されているトップブーム伸長用シーブ７１，（７１）も先端側に移動する。
　ここで、トップブーム伸長用シーブ７１，（７１）にシリンダチューブ先端側支持部１１を介して掛けられているトップブーム伸長用ワイヤ７２の両端は、トップブーム２４内の基端側に固定されているので、トップブーム２４を先端側に引っ張る。これによりトップブーム２４が先端側に移動して伸ばされる。 (3) Extension of the top boom 24 When the rod-shaped support member 10 moves to the distal end side, the top boom extension sheaves 71 (71) fixed to the distal end side of the rod-shaped support member 10 also move to the distal end side.
Here, both ends of the top boom extension wire 72 hung on the top boom extension sheaves 71, (71) via the cylinder tube tip side support portion 11 are fixed to the base end side in the top boom 24. Therefore, the top boom 24 is pulled to the tip side. Thereby, the top boom 24 moves to the front end side and is extended.
　また、図５に示すように各トップブーム伸長用シーブ７１の棒状サポート部材１０に対する配置位置は、トップブーム伸長用シーブ７１の回転中心７１ｓを棒状サポート部材１０の長さ方向（伸縮ブーム１の長さ方向Ａ）に通る水平線７１ｔが、棒状サポート部材１０の中立軸１０ｔの下側近傍に位置するように設定されている。なお、水平線７１ｔが中立軸１０ｔの上側近傍に位置するように各トップブーム伸長用シーブ７１の配置位置を設定しても良い。 Further, as shown in FIG. 5, the position of each top boom extension sheave 71 relative to the rod-like support member 10 is such that the rotation center 71 s of the top boom extension sheave 71 is aligned with the length direction of the rod-like support member 10 (the length of the telescopic boom 1). A horizontal line 71t passing in the direction A) is set so as to be positioned near the lower side of the neutral shaft 10t of the rod-shaped support member 10. The arrangement position of each top boom extending sheave 71 may be set so that the horizontal line 71t is positioned in the vicinity of the upper side of the neutral shaft 10t.
　中立軸１０ｔとは、棒状サポート部材１０に曲げモーメントをかけたときに棒状サポート部材１０が負荷を受けていない部分である。棒状サポート部材１０は棒状に形成されているため、中立軸１０ｔは通常水平線７１ｔと一致する。しかし、棒状サポート部材１０は、前述したように下方へ開口した断面Ｕ字型に形成されているため上部の強度が高くなり、中立軸１０ｔは水平線７１ｔよりも上側に位置している。 The neutral shaft 10t is a portion where the rod-shaped support member 10 is not subjected to a load when a bending moment is applied to the rod-shaped support member 10. Since the rod-shaped support member 10 is formed in a rod shape, the neutral shaft 10t normally coincides with the horizontal line 71t. However, since the bar-shaped support member 10 is formed in a U-shaped cross section that opens downward as described above, the strength of the upper portion is increased, and the neutral shaft 10t is positioned above the horizontal line 71t.
　また、棒状サポート部材先端側支持部１４の先端側にはローラ取り付け部１４１が設けられている。このローラ取り付け部１４１の上部と下部には、それぞれ上部ローラ１４ｂ，（１４ｂ）と下部ローラ１４ａ，（１４ａ）が取り付けられている。 Also, a roller mounting portion 141 is provided on the distal end side of the rod-shaped support member distal end side support portion 14. Upper rollers 14b and (14b) and lower rollers 14a and (14a) are attached to the upper and lower portions of the roller attaching portion 141, respectively.
　上部ローラ１４ｂ，（１４ｂ）と下部ローラ１４ａ，（１４ａ）は、それぞれ伸縮ブーム１の伸縮時にブーム本体２内の上側と下側に接触しながら移動して伸縮装置３を支持するものである。 The upper rollers 14b, (14b) and the lower rollers 14a, (14a) move while contacting the upper and lower sides of the boom body 2 when the telescopic boom 1 is expanded and contracted to support the telescopic device 3.
［２つの縮小用ワイヤ機構］
　次に、図１～図３を用いて２つの縮小用ワイヤ機構について説明する。２つの縮小用ワイヤ機構は、サードブーム縮小用ワイヤ機構８とトップブーム縮小用ワイヤ機構９である。 [Two reduction wire mechanisms]
Next, the two reduction wire mechanisms will be described with reference to FIGS. The two reduction wire mechanisms are a third boom reduction wire mechanism 8 and a top boom reduction wire mechanism 9.
　サードブーム縮小用ワイヤ機構８は、サードブーム２３を縮小するものである。このサードブーム縮小用ワイヤ機構８は、一対のサードブーム縮小用シーブ８１，（８１）と、サードブーム縮小用ワイヤ８２とを備えている。 The third boom reduction wire mechanism 8 reduces the third boom 23. The third boom reduction wire mechanism 8 includes a pair of third boom reduction sheaves 81, (81) and a third boom reduction wire 82.
　一対のサードブーム縮小用シーブ８１，（８１）は、セカンドブーム２２内の基端側に左右に配置されて固定されている。 The pair of third boom reduction sheaves 81, (81) are arranged on the left and right sides of the second boom 22 and fixed.
　また、サードブーム縮小用シーブ８１，（８１）は、回転軸（図示せず）が、セカンドブーム２２に対して水平になるように配置されている。なお、サードブーム縮小用シーブ８１，（８１）は、サードブーム縮小用ワイヤ８２が掛けられることが可能な範囲で、回転軸がセカンドブーム２２に対して傾いて配置されても良い。 Further, the third boom reduction sheaves 81 and (81) are arranged such that the rotation shaft (not shown) is horizontal with respect to the second boom 22. The third boom reduction sheaves 81 and (81) may be arranged such that the rotation axis is inclined with respect to the second boom 22 as long as the third boom reduction wire 82 can be hooked.
　サードブーム縮小用ワイヤ８２は、一対のサードブーム縮小用シーブ８１，（８１）に、棒状サポート部材１０の基端側に設けられた棒状サポート部材基端側支持部１６を介して掛けられている（図３参照）。サードブーム縮小用ワイヤ８２の両端は、ベースブーム２１の先端側に設けられたサードブーム縮小用ワイヤ固定部１７に固定されている。 The third boom reduction wire 82 is hung on a pair of third boom reduction sheaves 81, (81) via a rod-like support member proximal end support portion 16 provided on the proximal end side of the rod-like support member 10. (See FIG. 3). Both ends of the third boom reduction wire 82 are fixed to a third boom reduction wire fixing portion 17 provided on the distal end side of the base boom 21.
　トップブーム縮小用ワイヤ機構９は、トップブーム２４を縮小するものである。このトップブーム縮小用ワイヤ機構９は、一対のトップブーム縮小用シーブ９１，（９１）と、トップブーム縮小用ワイヤ９２とを備えている。 The top boom reduction wire mechanism 9 reduces the top boom 24. The top boom reduction wire mechanism 9 includes a pair of top boom reduction sheaves 91, (91) and a top boom reduction wire 92.
　一対のトップブーム縮小用シーブ９１，（９１）は、棒状サポート部材１０の基端側に左右に配置されて固定されている。 The pair of top boom reduction sheaves 91 and (91) are arranged and fixed to the base end side of the rod-shaped support member 10 on the left and right.
　また、トップブーム縮小用シーブ９１，（９１）は、回転軸（図示せず）が、棒状サポート部材１０に対して水平になるように配置されている。なお、トップブーム縮小用シーブ９１，（９１）は、トップブーム縮小用ワイヤ９２が掛けられることが可能な範囲で、回転軸が棒状サポート部材１０に対して傾いて配置されても良い。 Also, the top boom reduction sheaves 91 and (91) are arranged such that the rotation shaft (not shown) is horizontal with respect to the rod-shaped support member 10. The top boom reduction sheaves 91, (91) may be arranged such that the rotation shaft is inclined with respect to the rod-shaped support member 10 as long as the top boom reduction wire 92 can be hooked.
　トップブーム縮小用ワイヤ９２は、一対のトップブーム縮小用シーブ９１，（９１）にシリンダチューブ先端側支持部１１を介して掛けられている（図２参照）。トップブーム縮小用ワイヤ９２の両端は、トップブーム２４内の基端側の上面に設けられたトップブーム縮小用ワイヤ固定部１８に固定されている。このトップブーム縮小用ワイヤ固定部１８は、トップブーム伸長用ワイヤ固定部１５よりも基端側に配置され、トップブーム伸長用ワイヤ固定部１５と対向している。 The top boom reduction wire 92 is hung on the pair of top boom reduction sheaves 91, (91) via the cylinder tube tip side support portion 11 (see FIG. 2). Both ends of the top boom reduction wire 92 are fixed to a top boom reduction wire fixing portion 18 provided on the upper surface of the base end side in the top boom 24. The top boom reducing wire fixing portion 18 is disposed on the base end side with respect to the top boom extending wire fixing portion 15 and faces the top boom extending wire fixing portion 15.
　次に、２つの縮小用ワイヤ機構と伸縮シリンダ４を利用した伸縮ブーム１の全縮動作（図４→図１）について説明する。 Next, the full contraction operation (FIG. 4 → FIG. 1) of the telescopic boom 1 using two contracting wire mechanisms and the telescopic cylinder 4 will be described.
（１）セカンドブーム２２の縮小
　油圧によりシリンダチューブ４１が伸縮ブーム１の基端側に移動する。これによりシリンダチューブ４１が固定されているセカンドブーム２２が基端側に移動して縮められる。 (1) Reduction of the second boom 22 The cylinder tube 41 moves to the base end side of the telescopic boom 1 by hydraulic pressure. Thereby, the second boom 22 to which the cylinder tube 41 is fixed moves to the proximal end side and is contracted.
（２）サードブーム２３の縮小
　セカンドブーム２２が基端側に移動すると、セカンドブーム２２内の基端側に固定されているサードブーム縮小用シーブ８１，（８１）も基端側に移動する。
　ここで、サードブーム縮小用シーブ８１，（８１）に棒状サポート部材基端側支持部１６を介して掛けられているサードブーム縮小用ワイヤ８２は、両端が棒状サポート部材１０の基端側を介してベースブーム２１の先端側に固定されている。
　したがって、サードブーム縮小用ワイヤ８２は、サードブーム縮小用シーブ８１，（８１）が基端側に移動すると、両端がベースブーム２１の先端側に固定されたままなので、中間部分で棒状サポート部材１０を基端側に引っ張る。これにより棒状サポート部材１０は基端側に移動する。これに伴い、棒状サポート部材１０が固定されているサードブーム２３が基端側に移動して縮められる。 (2) Reduction of the third boom 23 When the second boom 22 moves to the base end side, the third boom reduction sheaves 81 (81) fixed to the base end side in the second boom 22 also move to the base end side.
Here, the third boom reduction wire 82 hung on the third boom reduction sheaves 81, (81) via the rod-like support member proximal end support portion 16 has both ends via the proximal end side of the rod-like support member 10. The base boom 21 is fixed to the front end side.
Accordingly, when the third boom reduction sheave 81, (81) moves to the proximal end side, the both ends of the third boom reduction wire 82 remain fixed to the distal end side of the base boom 21, so that the rod-like support member 10 is in the middle portion. Pull to the proximal side. Thereby, the rod-shaped support member 10 moves to the base end side. Along with this, the third boom 23 to which the rod-like support member 10 is fixed moves to the proximal end side and is contracted.
（３）トップブーム２４の縮小
　棒状サポート部材１０が基端側に移動すると、棒状サポート部材１０の基端側に固定されているトップブーム縮小用シーブ９１，（９１）も基端側に移動する。
　ここで、トップブーム縮小用シーブ９１，（９１）にシリンダチューブ先端側支持部１１を介して掛けられているトップブーム縮小用ワイヤ９２は、両端がトップブーム２４内の基端側に固定されているのでトップブーム２４を基端側に引っ張る。これによりトップブーム２４が基端側に移動して縮められる。 (3) Reduction of the top boom 24 When the rod-like support member 10 moves to the proximal end side, the top boom reduction sheaves 91 and (91) fixed to the proximal end side of the rod-like support member 10 also move to the proximal end side. .
Here, the top boom reduction wire 92 that is hung on the top boom reduction sheaves 91, (91) via the cylinder tube distal end side support portion 11 is fixed at both ends to the proximal end side in the top boom 24. Therefore, the top boom 24 is pulled to the base end side. Thereby, the top boom 24 moves to the proximal end side and is contracted.
　このように本実施の形態の伸縮ブーム１の伸縮装置３は、１本の伸縮シリンダ４と伸縮機構５を使用して伸縮ブーム１を伸縮するようにした。 As described above, the telescopic device 3 of the telescopic boom 1 according to the present embodiment uses the single telescopic cylinder 4 and the telescopic mechanism 5 to expand and contract the telescopic boom 1.
　従来の伸縮装置では、本実施の形態のような４段式の伸縮ブームにおいてセカンドブームとサードブームを伸縮するために２本の伸縮シリンダを使用した。しかし、本実施の形態の伸縮装置３では、サードブーム２３を伸縮するために伸縮シリンダの代わりに伸縮機構５を使用した。これにより伸縮シリンダの使用本数が従来よりも１本減少して１本になるので、伸縮シリンダの伸縮動作の制御を従来よりも簡単にすることが可能になる。よって、本実施の形態の伸縮装置３は、低コスト化を図ることができる。 In the conventional telescopic device, two telescopic cylinders are used to expand and contract the second boom and the third boom in the four-stage telescopic boom as in this embodiment. However, in the telescopic device 3 of the present embodiment, the telescopic mechanism 5 is used instead of the telescopic cylinder in order to expand and contract the third boom 23. As a result, the number of telescopic cylinders used is reduced by one from the conventional one, so that the control of the telescopic operation of the telescopic cylinder can be made simpler than before. Therefore, the expansion / contraction apparatus 3 of this Embodiment can achieve cost reduction.
　また、本実施の形態の伸縮装置３では、伸縮機構５を使用することにより伸縮シリンダの使用本数が従来よりも１本減少して１本になるので各ブームの同時伸縮が可能になり、ブームの段替り時のショックをなくすことが可能になる。よって、本実施の形態の伸縮装置３は、伸縮ブーム１の操作性を改善することができる。 Further, in the telescopic device 3 of the present embodiment, by using the telescopic mechanism 5, the number of telescopic cylinders used is reduced by one from the conventional one, so that each boom can be expanded and contracted simultaneously. It becomes possible to eliminate the shock at the time of changing. Therefore, the telescopic device 3 of the present embodiment can improve the operability of the telescopic boom 1.
　さらに本実施の形態の伸縮装置３では、棒状サポート部材１０を使用してトップブーム伸長用シーブ７１，（７１）をトップブーム２４に内蔵するようにした。 Furthermore, in the telescopic device 3 of the present embodiment, the top boom extending sheaves 71 and (71) are built in the top boom 24 using the rod-shaped support member 10.
　これにより差し込み作業時には、トップブーム伸長用シーブ７１，（７１）が障害物に干渉することがなくなる。よって、本実施の形態の伸縮装置３は、差し込み作業の効率化を図ることができる。 This prevents the top boom extension sheaves 71, (71) from interfering with obstacles during insertion. Therefore, the telescopic device 3 according to the present embodiment can improve the efficiency of the insertion work.
　また、本実施の形態の伸縮装置３では、シリンダチューブ先端側支持部１１にサードブーム伸長用シーブ６１を配置してトップブーム２４に内蔵するようにした。 Further, in the telescopic device 3 of the present embodiment, the third boom extending sheave 61 is arranged on the cylinder tube tip side support portion 11 and is built in the top boom 24.
　これにより差し込み作業時には、サードブーム伸長用シーブ６１も障害物に干渉することがなくなる。よって、本実施の形態の伸縮装置３は、差し込み作業の効率化をさらに図ることができる。 This prevents the third boom extension sheave 61 from interfering with obstacles during insertion. Therefore, the telescopic device 3 of the present embodiment can further improve the efficiency of the insertion work.
　また、本実施の形態の伸縮装置３では、各トップブーム伸長用シーブ７１の配置位置を、回転中心７１ｓを通る水平線７１ｔが、棒状サポート部材１０の中立軸１０ｔの近傍に位置するように設定した。このため、伸縮装置３は、棒状サポート部材１０にかかる曲げモーメントを抑制することが可能になる。したがって、棒状サポート部材１０の断面をできるだけ小さく設定することが可能になり、棒状サポート部材１０の設置スペースを抑えることが可能になる。これに伴い、棒状サポート部材１０が内蔵されるトップブーム２４の断面も小さく設定することが可能になる。よって、本実施の形態の伸縮装置３は、伸縮ブーム１全体の断面（大きさ）を小さく設定でき、軽量化、低コスト化を図ることができる。 In the telescopic device 3 of the present embodiment, the arrangement position of each sheave 71 for extending the top boom is set so that the horizontal line 71t passing through the rotation center 71s is positioned in the vicinity of the neutral shaft 10t of the rod-shaped support member 10. . For this reason, the telescopic device 3 can suppress the bending moment applied to the rod-shaped support member 10. Therefore, the cross section of the bar-shaped support member 10 can be set as small as possible, and the installation space for the bar-shaped support member 10 can be reduced. Accordingly, the cross section of the top boom 24 in which the rod-like support member 10 is built can be set small. Therefore, the telescopic device 3 of the present embodiment can set the entire cross section (size) of the telescopic boom 1 to be small, and can achieve weight reduction and cost reduction.
　さらに、本実施の形態の伸縮装置３では、棒状サポート部材１０の先端側にトップブーム伸長用シーブ７１，（７１）を配置して、その棒状サポート部材１０をトップブーム２４に内蔵するように形成し、その棒状サポート部材１０の基端側にトップブーム縮小用シーブ９１，（９１）を配置した。これにより伸縮ブーム１の組立前、あるいは伸縮ブーム１の組立とは別に、または伸縮ブーム１の組立と同時でなくても、双方のシーブにトップブーム伸長用ワイヤ７２とトップブーム縮小用ワイヤ９２をそれぞれ掛けてテンションの調整をすることが可能になる。つまり、伸縮ブーム１の組立時に双方のワイヤ７２、９２を配索しなくても良いため、双方のワイヤ７２、９２が損傷しないように注意しながら組み立てを行う必要がなく、伸縮ブーム１の組立後に双方のワイヤ７２、９２のテンションを調整する必要もなくなる。よって、本実施の形態の伸縮装置３は、組立工数の低減化を図ることができる。 Further, in the telescopic device 3 of the present embodiment, the top boom extending sheaves 71 and (71) are arranged on the distal end side of the rod-shaped support member 10 and the rod-shaped support member 10 is formed so as to be built in the top boom 24. The top boom reducing sheaves 91 and (91) are arranged on the base end side of the rod-shaped support member 10. As a result, the top boom extension wire 72 and the top boom reduction wire 92 are attached to both sheaves before the telescopic boom 1 is assembled, separately from the telescopic boom 1 or not at the same time as the telescopic boom 1 is assembled. It is possible to adjust the tension by hanging each. That is, since it is not necessary to route both the wires 72 and 92 when the telescopic boom 1 is assembled, there is no need to assemble while paying attention not to damage both wires 72 and 92. There is no need to adjust the tension of both wires 72 and 92 later. Therefore, the telescopic device 3 according to the present embodiment can reduce the number of assembly steps.
　また、トップブーム伸長用ワイヤ７２は、トップブーム伸長用シーブ７１，（７１）に伸縮シリンダ４の先端側を介して掛けられて、その両端がトップブーム２４内の基端側に固定されている。このため、トップブーム伸長用ワイヤ７２の固定作業は同じ場所で行うことになるので、トップブーム伸長用ワイヤ７２の固定作業の作業効率を上げることができる。 The top boom extension wire 72 is hung on the top boom extension sheaves 71, (71) via the distal end side of the telescopic cylinder 4, and both ends thereof are fixed to the proximal end side in the top boom 24. . For this reason, since the fixing work of the top boom extending wire 72 is performed at the same place, the working efficiency of the fixing operation of the top boom extending wire 72 can be increased.
　また、トップブーム縮小用ワイヤ９２は、トップブーム縮小用シーブ９１，（９１）に伸縮シリンダ４の先端側を介して掛けられて、その両端がトップブーム２４内の基端側に固定されている。このため、トップブーム縮小用ワイヤ９２の固定作業は同じ場所で行うことになるので、トップブーム縮小用ワイヤ９２の固定作業の作業効率を上げることができる。 The top boom reduction wire 92 is hung on the top boom reduction sheaves 91, (91) via the distal end side of the telescopic cylinder 4, and both ends thereof are fixed to the proximal end side in the top boom 24. . For this reason, since the fixing work of the top boom reducing wire 92 is performed at the same place, the working efficiency of the fixing work of the top boom reducing wire 92 can be increased.
　また、サードブーム伸長用ワイヤ６２は、伸縮シリンダ４の先端側に配置されたサードブーム伸長用シーブ６１に掛けられて、その両端が、伸縮シリンダ４の基端側と棒状サポート部材１０の基端側とに固定されるようにした。これにより伸縮ブーム１の組立前、あるいは伸縮ブーム１の組立とは別に、または伸縮ブーム１の組立と同時でなくてもサードブーム伸長用ワイヤ６２のテンションの調整をすることが可能になる。したがって、伸縮ブーム１の組立後にトップブーム伸長用ワイヤ７２、トップブーム縮小用ワイヤ９２のテンションの調整が不要になるとともに、サードブーム伸長用ワイヤ６２のテンションの調整も不要となる。よって、本実施の形態の伸縮装置３は、組立工数をさらに低減することができる。 Further, the third boom extending wire 62 is hung on a third boom extending sheave 61 disposed on the distal end side of the telescopic cylinder 4, and both ends thereof are proximal to the telescopic cylinder 4 and the proximal end of the rod-shaped support member 10. It was fixed to the side. This makes it possible to adjust the tension of the third boom extension wire 62 before the telescopic boom 1 is assembled, separately from the telescopic boom 1 assembly, or not simultaneously with the telescopic boom 1 assembly. Accordingly, it is not necessary to adjust the tension of the top boom extending wire 72 and the top boom reducing wire 92 after the telescopic boom 1 is assembled, and it is not necessary to adjust the tension of the third boom extending wire 62. Therefore, the telescopic device 3 of the present embodiment can further reduce the assembly man-hours.
　さらに、本実施の形態の伸縮装置３では、伸縮シリンダ４の先端側（シリンダチューブ先端側支持部１１）にサードブーム伸長用シーブ６１をトップブーム２４に内蔵するように配置し、棒状サポート部材１０を伸縮シリンダ４と平行に配置し、内側１０ｓにサードブーム伸長用シーブ６１の一部（上部６１ａ）が配置されるように形成した。 Further, in the telescopic device 3 according to the present embodiment, the third boom extending sheave 61 is disposed in the top boom 24 at the distal end side (cylinder tube distal end side support portion 11) of the telescopic cylinder 4, and the rod-shaped support member 10 is disposed. Was arranged in parallel with the telescopic cylinder 4, and a part (upper part 61a) of the sheave 61 for extending the third boom was arranged on the inner side 10s.
　これにより、トップブーム２４内においてシリンダチューブ４１の底部（図１において下部）から棒状サポート部材１０の上壁部１０ａまでの高さが抑えられ、トップブーム２４内の省スペース設計が可能になる。したがって、伸縮ブーム１の中で一番内側に配置されるトップブーム２４は断面積を必要以上に大きくする必要がなくなり、その他のブーム２１～２３も断面積を必要以上に大きくする必要がなくなる。よって、本実施の形態の伸縮装置３は、伸縮ブーム１全体の断面積を必要最小限に抑えることができる。その結果、伸縮ブーム１の軽量化を図ることができ、伸縮ブーム１の製造コストも抑えることができる。 Thus, the height from the bottom portion (lower portion in FIG. 1) of the cylinder tube 41 to the upper wall portion 10a of the rod-shaped support member 10 is suppressed in the top boom 24, and a space-saving design in the top boom 24 becomes possible. Therefore, the top boom 24 disposed on the innermost side of the telescopic boom 1 does not need to have a larger cross-sectional area than necessary, and the other booms 21 to 23 do not need to have a larger cross-sectional area than necessary. Therefore, the telescopic device 3 of the present embodiment can suppress the cross-sectional area of the entire telescopic boom 1 to the minimum necessary. As a result, the telescopic boom 1 can be reduced in weight, and the manufacturing cost of the telescopic boom 1 can be reduced.
　また、本実施の形態の伸縮装置３では、棒状サポート部材１０を断面形状が逆Ｕ字状である棒状に形成した。このため、棒状サポート部材１０の内側１０ｓを利用して伸縮シリンダ４が伸縮するときの先端部の左右方向、上下方向のガタツキを規制することが可能になる。よって、本実施の形態の伸縮装置３は、伸縮シリンダ４の先端部のガタツキを簡単な構成で規制できる。 Moreover, in the telescopic device 3 of the present embodiment, the rod-shaped support member 10 is formed in a rod shape whose cross-sectional shape is an inverted U shape. For this reason, it becomes possible to regulate the back-and-forth movement in the left-right direction and the up-down direction when the telescopic cylinder 4 expands and contracts using the inner side 10s of the rod-shaped support member 10. Therefore, the telescopic device 3 according to the present embodiment can regulate the backlash of the distal end portion of the telescopic cylinder 4 with a simple configuration.
　また、図８～図１１にも示すように棒状サポート部材１０は、一端側がサードブーム２３内の基端側において、左右に延びる連結軸（固定ピン１０１とサードブーム連結ピン１１０とが一体になったもの）を介して固定されており、各サードブーム伸長用ワイヤ６２の他端は、サードブーム伸長用ワイヤ他端側固定部１３を介して連結軸に固定されている。これらの具体的な構成について以下に説明する。 Further, as shown in FIGS. 8 to 11, the rod-like support member 10 has a connecting shaft (fixed pin 101 and third boom connecting pin 110 integrally formed) extending from side to side on the base end side in the third boom 23 at one end side. The other end of each third boom extending wire 62 is fixed to the connecting shaft via the third boom extending wire other end fixing portion 13. These specific configurations will be described below.
　図８に示すように、各サードブーム伸長用ワイヤ他端側固定部１３は、各サードブーム伸長用ワイヤ６２の他端に設けられている。さらに、各サードブーム伸長用ワイヤ他端側固定部１３はリング状に形成されており、固定ピン１０１を左右に挿通させる挿通穴１３ａを有している。 As shown in FIG. 8, each third boom extension wire other end fixing portion 13 is provided at the other end of each third boom extension wire 62. Furthermore, each third boom extending wire other end side fixing portion 13 is formed in a ring shape, and has an insertion hole 13a through which the fixing pin 101 is inserted right and left.
　また、棒状サポート部材基端側支持部１６は、棒状サポート部材１０の基端側に左右に離れて起立して設けられた一対の支持板１６１,１６１と、支持板１６１,１６１間に架け渡された連結板１６２と、連結板１６２の下面に設けられてサードブーム縮小用ワイヤ８２を折り返すための折返部１６３とを備えている。 Further, the bar-shaped support member base end side support portion 16 is bridged between a pair of support plates 161 and 161 that are provided on the base end side of the bar-shaped support member 10 so as to stand up and left and right, and the support plates 161 and 161. And a folded portion 163 provided on the lower surface of the coupling plate 162 for folding the third boom reduction wire 82.
　支持板１６１,１６１は、棒状サポート部材１０の基端側において左右の側壁部１０ｂ,１０ｂからさらに後方へ突出して形成されている。この支持板１６１,１６１には、円形のピン穴１６１ａ,１６１ａが形成されている。折返部１６３の左右側には、サードブーム縮小用ワイヤ８２が折り返された状態を保持する保持溝１６３ａ，１６３ａが設けられている。 The support plates 161 and 161 are formed so as to protrude further rearward from the left and right side wall portions 10b and 10b on the base end side of the rod-shaped support member 10. Circular pin holes 161 a and 161 a are formed in the support plates 161 and 161. Holding grooves 163a and 163a for holding the third boom reduction wire 82 in a folded state are provided on the left and right sides of the folded portion 163.
　固定ピン１０１は円筒状に形成されている。この固定ピン１０１は、複数のサードブーム伸長用ワイヤ他端側固定部１３を左右に並べて支持板１６１,１６１間に配置した状態で、図９に示すように各サードブーム伸長用ワイヤ他端側固定部１３の挿通穴１３ａに挿通して各サードブーム伸長用ワイヤ他端側固定部１３を固定している。さらにこの状態で、固定ピン１０１の両端部がピン穴１６１ａ，１６１ａに挿通して装着されている。これにより各サードブーム伸長用ワイヤ６２の他端は、サードブーム伸長用ワイヤ他端側固定部１３を介して固定ピン１０１に固定されている。 The fixing pin 101 is formed in a cylindrical shape. The fixing pin 101 is arranged in a state where a plurality of third boom extension wire other end fixing portions 13 are arranged side by side between the support plates 161 and 161, as shown in FIG. Each third boom extension wire other end side fixing portion 13 is fixed by being inserted into the insertion hole 13a of the fixing portion 13. Further, in this state, both end portions of the fixing pin 101 are inserted through the pin holes 161a and 161a. Thus, the other end of each third boom extension wire 62 is fixed to the fixing pin 101 via the third boom extension wire other end fixing portion 13.
　また、ピン穴１６１ａ,１６１ａに装着された固定ピン１０１の両端部には、図８、図１０、図１１に示すように、リング状のスペーサＳ１,Ｓ１を介してトップブーム縮小用シーブ９１,９１の軸穴９１ａ，９１ａが通されている。これによりトップブーム縮小用シーブ９１,９１は、固定ピン１０１の両端部に回転自在に支持されている。 Further, as shown in FIGS. 8, 10, and 11, both ends of the fixed pin 101 mounted in the pin holes 161a and 161a are attached to the sheaves 91 for reducing the top boom via ring-shaped spacers S1 and S1, respectively. 91 shaft holes 91a and 91a are passed therethrough. Thus, the top boom reducing sheaves 91 and 91 are rotatably supported at both ends of the fixing pin 101.
　また、図１０に示すように、サードブーム２３の側壁部２３ａ,２３ａの基端部にはボス部１０２，（１０２）が形成されている。このボス部１０２，（１０２）にはボス穴１０２ａ，（１０２ａ）が形成されている。このボス穴１０２ａ，（１０２ａ）には、サードブーム連結ピン１１０,１１０が挿入されている。 Further, as shown in FIG. 10, boss portions 102 (102) are formed at the base end portions of the side wall portions 23a, 23a of the third boom 23. Boss holes 102a and (102a) are formed in the boss portions 102 and (102). Third boom connecting pins 110, 110 are inserted into the boss holes 102a, (102a).
　サードブーム連結ピン１１０,１１０は、固定ピン１０１の孔１０１ａ（図８参照）に挿入されている。これにより固定ピン１０１は、サードブーム連結ピン１１０,１１０間に配置されるとともにサードブーム連結ピン１１０,１１０と同一軸線上に配置されて一体となっている。 The third boom connecting pins 110 and 110 are inserted into the holes 101a (see FIG. 8) of the fixing pin 101. As a result, the fixed pin 101 is disposed between the third boom connection pins 110 and 110 and is disposed on the same axis as the third boom connection pins 110 and 110 and is integrated.
　これにより、棒状サポート部材１０の一端側は、図８と図１１に示すように、連結軸（固定ピン１０１及びサードブーム連結ピン１１０，１１０）を介してサードブーム２３内の基端側（側壁部２３ａ,２３ａの基端部）に固定されている。なお、本実施の形態では、固定ピン１０１とサードブーム連結ピン１１０,１１０とを同一軸線上に配置したが、必ずしも同一軸線上でなくてもよく、固定ピン１０１の軸線からずれた位置に連結ピン１１０,１１０を配置してもよい。 Thereby, the one end side of the rod-shaped support member 10 is connected to the base end side (side wall) in the third boom 23 via the connecting shaft (the fixed pin 101 and the third boom connecting pins 110 and 110), as shown in FIGS. The base portions of the portions 23a and 23a are fixed. In the present embodiment, the fixed pin 101 and the third boom connecting pins 110 and 110 are arranged on the same axis, but may not necessarily be on the same axis, and may be connected to a position shifted from the axis of the fixed pin 101. The pins 110 and 110 may be arranged.
　このように本実施の形態の伸縮ブーム１の伸縮装置３では、サードブーム２３内の基端側に連結軸（固定ピン１０１及びサードブーム連結ピン１１０，１１０）を介して棒状サポート部材１０の一端側を固定し、さらにこの連結軸にサードブーム伸長用ワイヤ６２の他端を固定した。これにより、棒状サポート部材１０の一端側とサードブーム伸長用ワイヤ６２との固定部材を連結軸で共用することが可能になるため、固定部材の設置スペースを抑えることが可能になる。したがって、サードブーム２３内の省スペース設計が可能になるので、サードブーム２３は断面積を必要以上に大きくする必要がなくなり、その他のブームも断面積を必要以上に大きくする必要がなくなる。よって、本実施の形態の伸縮装置３は、伸縮ブーム１全体の断面積を必要最小限に抑えることができる。また、その結果、伸縮ブーム１の軽量化を図ることができ、伸縮ブーム１の製造コストも抑えることができる。さらに、固定部材の共用化が可能になることから伸縮装置３の部品点数の削減が可能になるので、伸縮装置３の製造コストをより抑えることができる。 As described above, in the telescopic device 3 of the telescopic boom 1 according to the present embodiment, one end of the rod-shaped support member 10 is connected to the base end side in the third boom 23 via the coupling shaft (fixing pin 101 and third boom coupling pins 110, 110). The other end of the third boom extension wire 62 was fixed to the connecting shaft. Thereby, since it becomes possible to share the fixing member of the one end side of the rod-shaped support member 10 and the wire 62 for extending | stretching the third boom with a connection axis | shaft, it becomes possible to restrain the installation space of a fixing member. Therefore, since the space-saving design in the third boom 23 becomes possible, the third boom 23 does not need to have a larger cross-sectional area than necessary, and the other booms do not need to have a larger cross-sectional area than necessary. Therefore, the telescopic device 3 of the present embodiment can suppress the cross-sectional area of the entire telescopic boom 1 to the minimum necessary. As a result, the telescopic boom 1 can be reduced in weight, and the manufacturing cost of the telescopic boom 1 can be reduced. Furthermore, since the fixing member can be shared, the number of parts of the expansion / contraction device 3 can be reduced, so that the manufacturing cost of the expansion / contraction device 3 can be further suppressed.
　また、本実施の形態の伸縮装置３では、サードブーム伸長用ワイヤ６２の他端に、連結軸を挿通させて当該他端を連結軸に固定するサードブーム伸長用ワイヤ他端側固定部１３を設けた。このため、伸縮ブーム１の製造においてサードブーム伸長用ワイヤ６２の他端を容易に連結軸に固定することが可能になる。よって、本実施の形態の伸縮装置３は、伸縮ブーム１の製造作業の作業効率を上げることができる。 Further, in the telescopic device 3 of the present embodiment, the third boom extension wire other end side fixing portion 13 is inserted into the other end of the third boom extension wire 62 and the other end is fixed to the connection shaft. Provided. For this reason, in the manufacture of the telescopic boom 1, the other end of the third boom extending wire 62 can be easily fixed to the connecting shaft. Therefore, the telescopic device 3 according to the present embodiment can increase the work efficiency of the manufacturing work of the telescopic boom 1.
　また、本実施の形態の伸縮ブーム１の伸縮装置３では、トップブーム縮小用シーブ９１，（９１）を連結軸に設けた。これによりトップブーム縮小用シーブ９１，（９１）の固定部材も連結軸で共用することが可能になるので、伸縮装置３の部品点数をさらに削減することが可能になる。よって、本実施の形態の伸縮装置３は、製造コストをさらに抑えることができる。 Also, in the telescopic device 3 of the telescopic boom 1 of the present embodiment, the top boom reducing sheaves 91, (91) are provided on the connecting shaft. As a result, the fixing members of the top boom reducing sheaves 91 and (91) can also be shared by the connecting shaft, so that the number of parts of the telescopic device 3 can be further reduced. Therefore, the expansion / contraction apparatus 3 of this Embodiment can further suppress manufacturing cost.
　また、図１２にも示すように、各サードブーム伸長用ワイヤ６２の一端は、シリンダロッド４２の基端部４２ａの下側に設けられたサードブーム伸長用ワイヤ一端側固定部１２に固定されている。この固定構造について以下に説明する。 Also, as shown in FIG. 12, one end of each third boom extension wire 62 is fixed to a third boom extension wire one end fixing portion 12 provided below the base end portion 42a of the cylinder rod 42. Yes. This fixing structure will be described below.
　サードブーム伸長用ワイヤ一端側固定部１２は、各サードブーム伸長用ワイヤ６２の一端に設けられた一端側固定部材１２１と、シリンダロッド４２の基端部４２ａの下側に設けられて各一端側固定部材１２１を固定する基端側固定部１２２とを備えている。 The third boom extension wire one end side fixing portion 12 is provided on one end side fixing member 121 provided on one end of each third boom extension wire 62 and on the lower side of the base end portion 42a of the cylinder rod 42, and on each one end side. And a base end side fixing portion 122 for fixing the fixing member 121.
　各一端側固定部材１２１は筒状に形成されており、伸縮ブーム１の長さ方向Ａに沿うように配置されている。各一端側固定部材１２１の前端には開口部（図示せず）が形成されている。各サードブーム伸長用ワイヤ６２の一端は、この開口部から一端側固定部材１２１内に挿入されて固定されている。各一端側固定部材１２１の外面にはネジ部１２１ａが設けられている。 Each one-end-side fixing member 121 is formed in a cylindrical shape, and is arranged along the length direction A of the telescopic boom 1. An opening (not shown) is formed at the front end of each one-end-side fixing member 121. One end of each third boom extension wire 62 is inserted into the one end side fixing member 121 from this opening and fixed. A screw portion 121 a is provided on the outer surface of each one end side fixing member 121.
　基端側固定部１２２は、シリンダロッド４２の基端部４２ａの下側に設けられた固定板１２３と、複数のナット１２４とを備えている。 The base end side fixing portion 122 includes a fixing plate 123 provided below the base end portion 42 a of the cylinder rod 42 and a plurality of nuts 124.
　固定板１２３には複数の貫通穴（図示せず）が左右に並んで設けられている。各貫通穴には一端側固定部材１２１が挿通した状態で嵌め込まれている。 The fixing plate 123 is provided with a plurality of through holes (not shown) side by side. The one end side fixing member 121 is fitted in each through hole.
　各ナット１２４は、固定板１２３よりも後方側において各一端側固定部材１２１に通されてネジ部１２１ａに螺合して固定板１２３の後面に当接されている。各ナット１２４の締め付け具合を調整することにより、各サードブーム伸長用ワイヤ６２のテンションを調整することが可能になっている。 Each nut 124 is passed through each one-end-side fixing member 121 on the rear side of the fixing plate 123, screwed into the screw portion 121a, and is in contact with the rear surface of the fixing plate 123. By adjusting the tightening degree of each nut 124, the tension of each third boom extending wire 62 can be adjusted.
　このように本実施の形態の伸縮装置３では、各一端側固定部材１２１と基端側固定部１２２とをサードブーム伸長用ワイヤ６２のテンションが調整可能なように螺合した。このため、サードブーム伸長用ワイヤ６２のテンションの調整作業を容易に行うことが可能になる。よって、本実施の形態の伸縮装置３は、サードブーム伸長用ワイヤ６２のテンションの調整作業の作業効率を上げることができる。 Thus, in the telescopic device 3 of the present embodiment, the one end side fixing member 121 and the base end side fixing portion 122 are screwed together so that the tension of the third boom extending wire 62 can be adjusted. For this reason, it is possible to easily adjust the tension of the third boom extension wire 62. Therefore, the telescopic device 3 of the present embodiment can increase the work efficiency of the adjustment operation of the tension of the third boom extension wire 62.
　次に、図１２～図１４を用いてベースブーム２１の構造について説明する。ベースブーム２１は、基端部の底部２１ａに点検用穴２１１が形成されている。この点検用穴２１１は、サードブーム伸長用ワイヤ６２のテンションを再調整するために使用されるものである。 Next, the structure of the base boom 21 will be described with reference to FIGS. The base boom 21 has an inspection hole 211 formed in the bottom 21a at the base end. The inspection hole 211 is used to readjust the tension of the third boom extension wire 62.
　また、この点検用穴２１１は閉塞部材２００により着脱可能に塞がれている。この閉塞部材２００は、点検用穴２１１を塞ぐ閉塞板２０１と、閉塞板２０１の上面の前部に設けられた座屈防止部材２０２と、座屈防止部材２０２の後面に設けられた補強部材２０３とを備えている。 Further, the inspection hole 211 is detachably closed by the closing member 200. The closing member 200 includes a closing plate 201 that closes the inspection hole 211, a buckling prevention member 202 provided at the front portion of the upper surface of the closing plate 201, and a reinforcing member 203 provided on the rear surface of the buckling prevention member 202. And.
　座屈防止部材２０２は、閉塞板２０１が点検用穴２１１を閉塞した状態で、固定板１２３の前面と、固定板１２３の前面の前方に配置された起立壁２１２の後面とに当接するように形成されている。なお、起立壁２１２は、ベースブーム２１の基端部の底部２１ａにおいて固定板１２３の前面の前方に起立して設けられている。 The buckling prevention member 202 is in contact with the front surface of the fixing plate 123 and the rear surface of the standing wall 212 disposed in front of the front surface of the fixing plate 123 in a state where the closing plate 201 closes the inspection hole 211. Is formed. The upright wall 212 is provided upright in front of the front surface of the fixed plate 123 at the bottom 21 a of the base end portion of the base boom 21.
　補強部材２０３は座屈防止部材２０２を補強するものである。この補強部材２０３は、座屈防止部材２０２の後面から後方に延びて設けられており、閉塞板２０１が点検用穴２１１を閉塞した状態で固定板１２３の下側に配置されている。 The reinforcing member 203 reinforces the buckling prevention member 202. The reinforcing member 203 is provided to extend rearward from the rear surface of the buckling prevention member 202, and is disposed below the fixed plate 123 with the closing plate 201 closing the inspection hole 211.
　閉塞部材２００は、点検用穴２１１を閉塞板２０１で閉塞すると、座屈防止部材２０２が固定板１２３の前面と起立壁２１２の後面とに当接する。この状態でシリンダチューブ４１が伸長した際にサードブーム伸長用ワイヤ６２が前方に引っ張られても、座屈防止部材２０２が固定板１２３を押さえてサードブーム伸長用ワイヤ６２の張力を吸収するので、シリンダロッド４２の座屈を防止することができる。 In the closing member 200, when the inspection hole 211 is closed with the closing plate 201, the buckling prevention member 202 comes into contact with the front surface of the fixing plate 123 and the rear surface of the standing wall 212. Even if the third boom extension wire 62 is pulled forward when the cylinder tube 41 is extended in this state, the buckling prevention member 202 presses the fixing plate 123 and absorbs the tension of the third boom extension wire 62. The buckling of the cylinder rod 42 can be prevented.
　さらに、座屈防止部材２０２は補強部材２０３により補強されているので、固定板１２３を確実に押さえてサードブーム伸長用ワイヤ６２の張力を確実に吸収し、シリンダロッド４２の座屈を確実に防止することができる。 Further, since the buckling prevention member 202 is reinforced by the reinforcing member 203, the fixing plate 123 is securely pressed to absorb the tension of the third boom extension wire 62 and the cylinder rod 42 is prevented from buckling. can do.
　以上、本発明に係る実施の形態を例示したが、本実施の形態は本発明の内容を限定するものではない。また、本発明の請求項の範囲を逸脱しない範囲であれば、各種の変更等は可能である。 As mentioned above, although embodiment which concerns on this invention was illustrated, this embodiment does not limit the content of this invention. Various modifications can be made without departing from the scope of the claims of the present invention.
　例えば、本実施の形態では、トップブーム縮小用シーブ９１，（９１）を棒状サポート部材１０の基端側に配置したが、棒状サポート部材１０が固定されているサードブーム２３内の基端側に配置しても良い。 For example, in the present embodiment, the top boom reducing sheaves 91, (91) are arranged on the proximal end side of the rod-shaped support member 10, but on the proximal end side in the third boom 23 to which the rod-shaped support member 10 is fixed. It may be arranged.
　また、本実施の形態では、各トップブーム伸長用シーブ７１の配置位置を、回転中心７１ｓを通る水平線７１ｔが棒状サポート部材１０の中立軸１０ｔの近傍に位置するように設定したが、棒状サポート部材１０の中立軸１０ｔと一致するように設定しても良い。 In the present embodiment, the arrangement position of each top boom extension sheave 71 is set so that the horizontal line 71t passing through the rotation center 71s is positioned in the vicinity of the neutral shaft 10t of the rod-shaped support member 10. 10 may be set to coincide with the neutral axis 10t.
　また、本実施の形態では、４段式の伸縮ブームに本発明の伸縮装置を適用した場合について説明した。しかし、本発明の伸縮装置は、４段式以上の伸縮ブームであれば適用することが可能である。具体的には、伸縮装置を構成する伸縮シリンダは、トップブームの２段下以降のブームを伸縮するために使用し、伸縮装置を構成する伸縮機構は、トップブームおよびその１段下のブームを伸縮するために使用する。 In the present embodiment, the case where the telescopic device of the present invention is applied to a four-stage telescopic boom has been described. However, the telescopic device of the present invention can be applied as long as it is a telescopic boom having four or more stages. Specifically, the telescopic cylinder that constitutes the telescopic device is used to extend and contract the boom that is two steps below the top boom, and the telescopic mechanism that constitutes the telescopic device includes the top boom and the boom one step below. Used to expand and contract.
　また、本発明の伸縮装置を４段式以上の伸縮ブームに適用する場合に、トップブームの１段下のブームを伸長するための伸長用シーブは、トップブーム側に位置する伸縮シリンダの先端側にトップブームに内蔵するように配置される。さらに、トップブーム縮小用シーブはトップブームの１段下のブーム内の基端側（例えば棒状サポート部材の基端側）に配置され、トップブームの１段下のブームを縮小するための縮小用シーブはトップブームの２段下のブーム内の基端側に配置される。 Further, when the telescopic device of the present invention is applied to a telescopic boom having four or more stages, the extension sheave for extending the boom one stage below the top boom is the distal end side of the telescopic cylinder located on the top boom side. It is arranged to be built in the top boom. Further, the sheave for reducing the top boom is disposed on the base end side (for example, the base end side of the bar-shaped support member) in the boom one step below the top boom, and is used for reducing the boom one step below the top boom. The sheave is arranged on the base end side in the boom two steps below the top boom.
　また、本実施の形態では、伸縮シリンダ４の上方に棒状サポート部材１０を配置しているが、これに限らず、例えばこの逆で伸縮シリンダ４の下方に棒状サポート部材１０を配置してもよい。この場合には、棒状サポート部材１０の断面形状をＵ字状に形成し、内側１０ｓにサードブーム伸長用シーブ６１の下部６１ｂ（図８、図９参照）を配置する。 Moreover, in this Embodiment, although the rod-shaped support member 10 is arrange | positioned above the expansion-contraction cylinder 4, it is not restricted to this, For example, you may arrange | position the rod-shaped support member 10 below the expansion-contraction cylinder 4 on the contrary. . In this case, the cross-sectional shape of the rod-shaped support member 10 is formed in a U shape, and the lower portion 61b (see FIGS. 8 and 9) of the third boom extension sheave 61 is disposed on the inner side 10s.
　また、本実施の形態では、棒状サポート部材１０として底を有する形状のものを使用したが、棒状サポート部材が底を有しない形状、例えば棒状サポート部材が左右に分割された形状を有しているものを使用しても良い。この場合には、側面から見て棒状サポート部材の内側に１段下のブーム伸長用シーブの一部が重なっている構成でも、棒状サポート部材の内側に１段下のブーム伸長用シーブの一部が配置されていると言っても良い。 In the present embodiment, the rod-shaped support member 10 has a shape having a bottom. However, the rod-shaped support member has a shape that does not have a bottom, for example, a shape in which the rod-shaped support member is divided into left and right. You may use things. In this case, even if the boom extending sheave one step below is overlapped inside the rod-shaped support member when viewed from the side, a part of the boom extending sheave one step below is disposed inside the rod-shaped support member. It may be said that is arranged.
関連出願の相互参照Cross-reference of related applications
　本出願は、２０１４年６月１７日に日本国特許庁に出願された特願２０１４－１２４２１１、２０１４年９月１１日に日本国特許庁に出願された特願２０１４－１８５６３５、２０１４年１０月２０日に日本国特許庁に出願された特願２０１４－２１３９０４、２０１４年１０月２０日に日本国特許庁に出願された特願２０１４－２１３９０５に基づいて優先権を主張し、その全ての開示は完全に本明細書で参照により組み込まれる。 This application includes Japanese Patent Application No. 2014-12421 filed with the Japan Patent Office on June 17, 2014, Japanese Patent Application No. 2014-185635 filed with the Japan Patent Office on September 11, 2014, October 2014 Claimed priority based on Japanese Patent Application No. 2014-213904 filed with the Japan Patent Office on the 20th and Japanese Patent Application No. 2014-213905 filed with the Japan Patent Office on October 20, 2014, all disclosures thereof Is fully incorporated herein by reference.

Claims (9)

  1. 　作業機に設けられる４段式以上の伸縮ブームの伸縮に使用される伸縮ブームの伸縮装置であって、
    　全縮時にトップブーム内に配置されて前記トップブームの２段下以降のブームを伸縮する少なくとも１本の伸縮シリンダと、当該少なくとも１本の伸縮シリンダの内で前記トップブーム側に位置するトップブーム側伸縮シリンダの伸縮動作に連動して前記トップブームおよびその１段下のブームを同時に伸縮する伸縮機構とを備え、
    　前記伸縮機構は、前記１段下のブーム内の基端側に一端側が固定されて前記トップブーム内に配置される棒状サポート部材を備え、当該棒状サポート部材は、その先端側に前記トップブームを伸長するためのトップブーム伸長用シーブを配置して前記トップブームに内蔵するように形成されていることを特徴とする伸縮ブームの伸縮装置。     A telescopic boom telescopic device used for telescopic expansion and contraction of a four-stage or larger telescopic boom provided on a work machine,
    At least one telescopic cylinder that is disposed in the top boom at the time of full contraction and expands / contracts the boom that is two or lower steps below the top boom, and the top boom that is located on the top boom side in the at least one telescopic cylinder A telescopic mechanism that simultaneously expands and contracts the top boom and its lower boom in conjunction with the expansion and contraction operation of the side expansion cylinder;
    The telescopic mechanism includes a bar-like support member that is fixed at one end side to the base end side in the lower boom and disposed in the top boom, and the bar-like support member has the top boom at the tip side thereof. An expansion / contraction device for a telescopic boom, wherein a sheave for extending a top boom for extending is disposed and built in the top boom.
  2. 　請求項１に記載の伸縮ブームの伸縮装置において、
    　前記トップブーム側伸縮シリンダの先端側に、前記１段下のブームを伸長するための１段下のブーム伸長用シーブを前記トップブームに内蔵するように配置したことを特徴とする伸縮ブームの伸縮装置。     The telescopic boom telescopic device according to claim 1,
    Expansion and contraction of the telescopic boom, wherein a boom lowering sheave for extending the lower boom is arranged at the front end side of the top boom side telescopic cylinder so as to be built in the top boom. apparatus.
  3. 　請求項１または請求項２に記載の伸縮ブームの伸縮装置において、
    　前記トップブームを縮小するためのトップブーム縮小用シーブを前記１段下のブーム内の基端側に配置したことを特徴とする伸縮ブームの伸縮装置。     In the expansion-contraction apparatus of the telescopic boom of Claim 1 or Claim 2,
    A telescopic boom extension / contraction device, wherein a top boom reduction sheave for reducing the top boom is arranged on the base end side in the lower boom.
  4. 　請求項３に記載の伸縮ブームの伸縮装置において、
    　前記１段下のブーム内の基端側で前記棒状サポート部材の基端側に前記トップブーム縮小用シーブを配置したことを特徴とする伸縮ブームの伸縮装置。     In the telescopic device of the telescopic boom according to claim 3,
    A telescopic boom telescopic device, wherein the top boom reducing sheave is disposed on the base end side of the rod-shaped support member on the base end side in the lower boom.
  5. 　請求項１～請求項４のいずれか１項に記載の伸縮ブームの伸縮装置において、
    　前記トップブーム伸長用シーブの前記棒状サポート部材に対する配置位置は、前記トップブーム伸長用シーブの回転中心を前記棒状サポート部材の長さ方向に通る水平線が、前記棒状サポート部材の中立軸と一致または当該中立軸の近傍に位置するように設定されていることを特徴とする伸縮ブームの伸縮装置。     In the telescopic device for the telescopic boom according to any one of claims 1 to 4,
    The position of the top boom extending sheave with respect to the rod-shaped support member is such that a horizontal line passing through the rotation center of the top boom extending sheave in the length direction of the rod-shaped support member coincides with the neutral axis of the rod-shaped support member or A telescopic boom telescopic device, wherein the telescopic boom telescopic device is set to be positioned in the vicinity of a neutral shaft.
  6. 　請求項１～請求項５のいずれか１項に記載の伸縮ブームの伸縮装置において、
    　前記トップブーム伸長用シーブは、前記棒状サポート部材の先端側に左右一対に配置されたものであり、当該一対のトップブーム伸長用シーブとともに前記トップブームを伸長するために使用されるトップブーム伸長用ワイヤは、当該一対のトップブーム伸長用シーブに前記トップブーム側伸縮シリンダの先端側を介して掛けられて、その両端が、前記トップブーム内の基端側に固定されていることを特徴とする伸縮ブームの伸縮装置。     The telescopic boom extension device according to any one of claims 1 to 5,
    The top boom extending sheaves are arranged in a pair of left and right on the distal end side of the rod-like support member, and are used for extending the top boom together with the pair of top boom extending sheaves. The wire is hung on the pair of top boom extending sheaves via the distal end side of the top boom side telescopic cylinder, and both ends thereof are fixed to the proximal end side in the top boom. Telescopic boom telescopic device.
  7. 　請求項４～請求項６のいずれか１項に記載の伸縮ブームの伸縮装置において、
    　前記トップブーム縮小用シーブは、前記棒状サポート部材の基端側に左右一対に配置されたものであり、当該一対のトップブーム縮小用シーブとともに前記トップブームを縮小するために使用されるトップブーム縮小用ワイヤは、当該一対のトップブーム縮小用シーブに前記トップブーム側伸縮シリンダの先端側を介して掛けられて、その両端が、前記トップブーム内の基端側に固定されていることを特徴とする伸縮ブームの伸縮装置。     The telescopic boom extension device according to any one of claims 4 to 6,
    The top boom reduction sheaves are arranged in a pair of left and right on the base end side of the rod-shaped support member, and together with the pair of top boom reduction sheaves, the top boom reduction is used to reduce the top boom. The wire is hung on the pair of top boom reducing sheaves via the distal end side of the top boom side telescopic cylinder, and both ends thereof are fixed to the proximal end side in the top boom. Telescopic boom telescopic device.
  8. 　請求項２～請求項７のいずれか１項に記載の伸縮ブームの伸縮装置において、
    　前記棒状サポート部材は、その内側に前記１段下のブーム伸長用シーブの一部が配置されるように形成されていることを特徴とする伸縮ブームの伸縮装置。     The telescopic boom telescopic device according to any one of claims 2 to 7,
    The rod-like support member is formed such that a part of the one-stage lower boom extending sheave is disposed on the inner side thereof, and the telescopic boom telescopic device.
  9. 　請求項８に記載の伸縮ブームの伸縮装置において、
    　前記棒状サポート部材は、前記トップブーム側伸縮シリンダの上方に配置されて、断面形状が逆Ｕ字状である棒状に形成され、当該棒状サポート部材の内側には前記１段下のブーム伸長用シーブの上部が配置されていることを特徴とする伸縮ブームの伸縮装置。     The telescopic boom telescopic device according to claim 8,
    The rod-like support member is disposed above the top boom side telescopic cylinder, and is formed in a rod shape having a reverse U-shaped cross-section, and the boom extension sheave below the first stage is disposed inside the rod-like support member. A telescopic boom telescopic device, characterized in that the upper part of the telescopic boom is disposed.
PCT/JP2015/062972 2014-06-17 2015-04-30 Extension and retraction device for telescopic boom WO2015194268A1 (en)

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KR101891909B1 (en) 2018-08-24
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