JP2006264797A - Telescopic boom device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a telescopic boom device, which is usable even in a structure of a low ceiling. <P>SOLUTION: This telescopic boom device 1 comprises first to n-th intermediate booms 3-6 and a tip boom 7 stored in a base end boom 2 to be telescopically extended in order. Between the base end boom 2 and the first intermediate boom 3, an extending cylinder 8 is provided. Between the base end boom 2 and the third intermediate boom, between the first and the third intermediate booms, between the second and the fourth intermediate boom, and between the third intermediate boom and the tip boom 7, transmission mechanisms each comprising a rack 12, a gear 13, a first and a second bevel gears 15 and 16, a male screw shaft 19, and a female screw member 20 are respectively provided to be interlocked with each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a telescopic boom device, and more particularly to a telescopic boom device capable of extending and retracting a boom in multiple stages such as 5 stages and 6 stages.

  In a telescopic boom device equipped with a plurality of booms that expand and contract in multiple stages, particularly 5 stages or more, in order to reduce the bending moment when the boom is extended due to an increase in the weight of the boom, 1 to 2 hydraulic cylinders are installed, and in order to transmit the expansion / contraction movement of the boom on the proximal end side by the hydraulic cylinders to the boom on the distal end side, a pulley and a rope that spans the pulley are attached to the boom on the distal end side. There are some provided (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-129986

  In the above-described telescopic boom device, there are many examples in which a pulley provided on the boom on the distal end side and a rope hung around the pulley are exposed on the upper surface side of the boom on the distal end side.

  On the other hand, this type of telescopic boom device is used in work machines such as cranes or aerial work platforms. Depending on the user, for example, it can be used for cargo handling work in tunnels or structures with low ceilings. There is. In this case, the pulley or rope exposed on the top surface of the boom on the tip side during the work may inadvertently collide with the top surface of the tunnel or the ceiling surface of a structure with a low ceiling, thereby damaging the pulleys, etc. There is.

  When such damage occurs, it is necessary to interrupt the handling operation by the work machine or to move the work machine out of the structure having a low tunnel or ceiling in order to repair it on the spot. In any case, the situation where the cargo handling operation is interrupted is unavoidable, and there is a problem that the workability is remarkably lowered.

  This invention is made | formed based on the above-mentioned matter, and it aims at providing the telescopic boom apparatus which can be used also in the structure with a low ceiling.

  In order to achieve the above object, the present invention provides a telescopic boom device in which the first to n intermediate booms and the distal boom are accommodated in a base boom so that the base boom can be telescopically extended. A telescopic cylinder is provided between the end boom and the first intermediate boom, and a gear that meshes with a rack provided in the boom telescopic direction on the inner surface of the base end boom is provided in the base side of the first intermediate boom, and the gear is connected to the gear. A first bevel gear is provided coaxially with the first bevel gear, the second bevel gear is engaged with the first bevel gear, one end of the male screw shaft is connected to the shaft of the second bevel gear, and the other end of the male screw shaft is the second end. The rack, the gear, the first and second bevel gears, the male screw shaft and the female screw member are screwed into the female screw member provided on the intermediate boom, and the first to third intermediate booms, the second to fourth intermediate booms, the third Through the fifth intermediate boom And butterflies.

  According to a second aspect of the present invention, there is provided a telescopic boom device in which first to n intermediate booms and a distal end boom are accommodated in a base boom so as to be capable of telescopic expansion and contraction. A telescopic cylinder is provided between the boom and the second intermediate boom, and a gear that meshes with a rack provided in the boom telescopic direction on the inner surface of the first intermediate boom is provided in the base side of the second intermediate boom. A first bevel gear is provided coaxially therewith, the second bevel gear is meshed with the first bevel gear, one end of the male screw shaft is connected to the shaft of the second bevel gear, and the other end of the male screw shaft is connected to the first end. 3 is screwed into a female screw member provided on the intermediate boom, and the rack, gear, first and second bevel gears, male screw shaft and female screw member are respectively connected to the second to fourth intermediate boom and the third to fifth intermediate boom. It is characterized by being provided in conjunction.

  Furthermore, the third invention is the first or second invention, wherein the rack, gears, first and second bevel gears, male screw shafts and female screw members are alternately arranged in the width direction at the upper part in each boom. It is characterized by that.

  According to a fourth invention, in the first or second invention, the rack, the gear, the first and second bevel gears, the male screw shaft, and the female screw member are alternately arranged at an upper part and a lower part in each boom. It is characterized by that.

  According to the present invention, the telescopic mechanisms of the plurality of intermediate booms and the tip booms are housed in the booms so that the boom telescopic mechanisms are not exposed on the upper surface of the boom. The cargo handling work in the structure can be performed, a versatile work machine can be provided, the flexibility as a user is good, and the work efficiency can be improved.

Hereinafter, embodiments of the telescopic boom device of the present invention will be described with reference to the drawings.
1 to 4 show an embodiment of the telescopic boom device according to the present invention. FIG. 1 is a longitudinal front view showing an embodiment of the telescopic boom device according to the present invention. FIG. FIG. 3 is a plan view showing the booms with the upper surface of each boom in the embodiment of the telescopic boom device of the present invention deleted, and FIG. 3 shows the embodiment of the telescopic boom device of the present invention shown in FIG. FIG. In these drawings, the telescopic boom device 1 shows a form extending in five stages in this example, and a base end boom 2, a first intermediate boom 3, a second intermediate boom 4, The third intermediate boom 5, the fourth intermediate boom 6, and the tip boom 7 are inserted so as to be sequentially extendable and contractible. Each boom is slidable by a slipper 1A provided on the inner surface of the outer boom as shown in FIGS.

  The base end boom 2 is provided so that its base portion can be raised and lowered, for example, in a vehicle, and is raised and lowered by a cylinder (not shown) provided between the lower surface of the base end boom 2 and the vehicle. The tip boom 7 is provided with a hook (not shown) for handling work.

  Between the base end boom 2 and the first intermediate boom 3, an expansion / contraction cylinder 8 for extending and contracting the first intermediate boom 3 with respect to the base end boom 2 is disposed. The piston rod 8B side of the main body 8A of the cylinder 8 is supported on the inner base portion of the first intermediate boom 3 by a pin shaft support boss 9 as shown in FIGS. The tip of the piston rod 8B of the cylinder 8 is connected to the boss 11 of the inner base portion of the proximal boom 2 by a pin shaft 10 as shown in FIGS.

  On one side in the width direction of the upper inner surface of the base end boom 2, as shown in FIG. 2, a rack 12 is provided along the longitudinal direction (stretching direction). A gear 13 that meshes with the rack 12 is rotatably provided inside the base portion of the first intermediate boom 3. The upper portions of these gears 13 protrude upward through a notch portion 14 provided at the upper portion of the first intermediate boom 3 in order to mesh with the rack 12 as shown in FIG.

  The gear 13 is provided with a first bevel gear 15 concentrically with its axis. A second bevel gear 16 meshes with the first bevel gear 15. The shaft 17 of the second bevel gear 16 is supported by a bearing 18 so as to be rotatable in the boom expansion / contraction direction. The bearing 18 is fixed to the upper inner surface of the first intermediate boom 3.

  One end of a male screw shaft 19 having a male screw is connected to the shaft 17 of the second bevel gear 16. The other end side of the male screw shafts 18 is engaged with the female screw of the female screw member 20. The female screw member 20 is fixed to the upper inner surface of the second intermediate boom 4. When the first intermediate boom 3 is extended with respect to the proximal boom 2, the male screw shaft 19 and the female screw member 20 are engaged with each other by meshing with the gear 13 and the first and second bevel gears 15 and 16. The male screw shaft 19 rotates in the clockwise direction in FIG. 3, for example, and this rotation pushes the female screw member 20 to the boom tip side.

  The transmission mechanism including the rack 12, the gear 13, the first and second bevel gears 15, 16, the male screw shaft 19, and the female screw member 20 is responsive to expansion and contraction of the first intermediate boom 3 relative to the proximal boom 2. 2 The middle boom 4 is operated to extend and contract with respect to the first middle boom 3.

  As shown in FIG. 2, the transmission mechanism described above is between the first intermediate boom 1 to the third intermediate boom 5, between the second intermediate boom 4 to the fourth intermediate boom 6, and between the third intermediate boom 5 to the tip boom 7. Are alternately arranged on the side in the width direction of the boom so as not to cross each other.

Next, the operation of the above-described embodiment of the telescopic boom device of the present invention will be described with reference to FIGS.
1 and 2 show a state in which the telescopic boom device 1 is extended, but when the telescopic boom device 1 is extended from a contracted state, the oil chamber in the main body 8A of the telescopic cylinder 8 is shown. Pressure oil is supplied to the piston rod 8B to extend the piston rod 8B. By extension of the piston rod 8B, the first intermediate boom 3 is pushed out in the right direction in FIG.

  The extension of the first intermediate boom 3 causes the gear 13 that meshes with the rack 12 in the proximal boom 2 to rotate counterclockwise in FIG. The rotation of the gear 13 rotates the first bevel gear 15, and the rotation of the first bevel gear 15 is transmitted to the second bevel gear 16. As a result, the male screw shaft 19 connected to the second bevel gear 16 rotates clockwise in FIG. 3 and moves the female screw member 20 to the boom tip side (right side in FIGS. 1 and 2). The boom 4 extends with respect to the first intermediate boom 3.

  By the extension of the second intermediate boom 4 described above, the gear 13 provided on the second intermediate boom 4 rotates by meshing with the rack 12 provided on the first intermediate boom 3. This rotation is transmitted to the male screw shaft 19 in the second intermediate boom 4 via the first and second bevel gears 15 and 16 provided in the second intermediate boom 4. Thereby, the third intermediate boom 5 extends with respect to the second intermediate boom 4.

  By the extension of the third intermediate boom 5 described above, the fourth intermediate boom 6 is extended in the same manner as described above by the transmission mechanism described above, and the tip boom 7 is sequentially extended by the transmission mechanism described above by further extension of the fourth intermediate boom 6. To do.

  As described above, when the telescopic boom device 1 is extended in a work site where the ceiling is low, for example, the transmission mechanism for expanding and contracting the boom is housed in the boom. Can continue. As a result, the workability can be improved.

  When the telescopic boom device 1 is contracted, if the piston rod 8B of the telescopic cylinder 8 is contracted, the transmission mechanism operates in reverse to the operation described above, and the telescopic boom device 1 can be contracted.

  4 and 5 show another embodiment of the telescopic boom device of the present invention, FIG. 4 is a longitudinal front view thereof, and FIG. 5 is another embodiment of the telescopic boom device of the present invention shown in FIG. It is a top view which deletes and shows the upper surface of each boom in a form. In these drawings, the same reference numerals as those shown in FIG. 1 and FIG.

  This embodiment is of a type that extends in five stages, similar to the telescopic boom device 1 shown in FIGS. 1 and 2 described above, and a base end boom 2 and a first intermediate boom 3 in the base end boom 2. The second intermediate boom 4, the third intermediate boom 5, the fourth intermediate boom 6, and the tip boom 7 are sequentially inserted and retracted. Further, another telescopic cylinder 21 is provided between the first intermediate boom 2 and the third intermediate boom 4, and between the first intermediate boom 3 to the third intermediate boom 5, the second intermediate boom 4 to fourth. A transmission mechanism including a rack 12, a gear 13, first and second bevel gears 15 and 16, a male screw shaft 19, and a female screw member 20 between the intermediate booms 6 and between the third intermediate boom 5 and the tip boom 7. Are arranged respectively.

  In this embodiment, when the piston rod 21B of the expansion / contraction cylinder 21 expands / contracts, the transmission mechanism described above operates in response to the expansion / contraction movement of the second intermediate boom 4, so that the same as in the above-described embodiment. The third intermediate boom 5 and the tip boom 7 can be expanded and contracted sequentially.

  According to this embodiment, when the telescopic boom device 1 is extended in a work site having a low ceiling, for example, as in the above-described embodiment, the transmission mechanism for extending and retracting the boom is housed in the boom. Therefore, the transmission mechanism is not damaged, and the operation can be continued. As a result, the workability is improved. Moreover, since the number of installation locations of the transmission mechanism is reduced as compared with the embodiment shown in FIG. 1, the assembly workability is improved.

  In the above-described embodiment, the case of expanding and contracting to five stages has been described, but the present invention can also be applied to the case of six or more stages.

  Moreover, in the above-mentioned embodiment, although the transmission mechanism was alternately provided in the width direction along the boom expansion-contraction direction, it is also possible to provide alternately in the up-down direction along the boom expansion-contraction direction. In this case, since the male screw shaft 19 and the female screw member 20 can be disposed in the middle part in the width direction of the boom, the expansion and contraction force to each boom acts on the middle part in the width direction, and each boom is further smoothened. Can be expanded and contracted.

It is a vertical front view which shows one Embodiment of the telescopic boom apparatus of this invention. It is a top view which deletes the upper surface of each boom in one Embodiment of the telescopic boom apparatus of this invention shown in FIG. It is the expanded sectional view which looked at one Embodiment of the telescopic boom apparatus of this invention shown in FIG. 1 from the III-III arrow. It is a vertical front view which shows other embodiment of the telescopic boom apparatus of this invention. It is a top view which deletes the upper surface of each boom in other embodiment of the telescopic boom apparatus of this invention shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Telescopic boom apparatus 2 Base end boom 3 1st intermediate | middle boom 4 2nd intermediate | middle boom 5 3rd intermediate | middle boom 6 4th intermediate | middle boom 7 Front end boom 8 Telescopic cylinder 12 Rack 13 Gear 15 First bevel gear 16 Second bevel gear 19 Male screw shaft 20 Female screw member

Claims (4)

  In the telescopic boom device in which the first to n intermediate booms and the tip boom are accommodated in the base end boom in such a manner that the base boom can be extended and contracted sequentially, an extendable cylinder is provided between the base end boom and the first intermediate boom. A gear meshing with a rack provided in the boom telescopic direction on the inner surface of the end boom is provided in the base side of the first intermediate boom, a first bevel gear is provided coaxially with the gear, and a second bevel is provided on the first bevel gear. The gear is meshed, the one end of the male screw shaft is connected to the shaft of the second bevel gear, the other end of the male screw shaft is screwed to the female screw member provided on the second intermediate boom, and the rack, gear, first The telescopic boom, wherein the second bevel gear, the male screw shaft, and the female screw member are provided in conjunction with the first to third intermediate boom, the second to fourth intermediate boom, and the third to fifth intermediate boom, respectively. apparatus.   In the telescopic boom device in which the first to n intermediate booms and the tip boom are housed in the base end boom in such a manner that the base boom can be extended and contracted sequentially, the base end boom, the first intermediate boom, the first intermediate boom, and the second intermediate boom A telescopic cylinder is provided, and a gear meshing with a rack provided in the boom telescopic direction on the inner surface of the first intermediate boom is provided in the base side of the second intermediate boom, and the first bevel gear is coaxial with the gear. A female screw member in which a second bevel gear is engaged with the first bevel gear, one end of a male screw shaft is connected to the shaft of the second bevel gear, and the other end of the male screw shaft is provided in a third intermediate boom And the rack, gears, first and second bevel gears, male screw shafts and female screw members are provided in conjunction with the second to fourth intermediate booms and the third to fifth intermediate booms, respectively. Telescopic boom device.   The telescopic boom device according to claim 1 or 2, wherein the rack, the gear, the first and second bevel gears, the male screw shaft, and the female screw member are alternately arranged in the width direction at an upper portion in each boom.   The telescopic boom device according to claim 1 or 2, wherein the rack, the gear, the first and second bevel gears, the male screw shaft, and the female screw member are alternately arranged at an upper part and a lower part in each boom.

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