JPS58177892A - Overhanging and encasing method for extension jib in wheel type crane - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for extending and retracting a supplementary jib in a wheel crane such as a truck crane or a rough terrain crane.

The replenishment jib that is added to the telescopic boom of a wheeled crane consists of a truss-type cantilevered jib with a truss structure and a number of connecting punches between the side rods made of a pair of square pipes, etc. There are two types of compression column type jibs supported by suspension rods (hereinafter simply referred to as truss type jibs and compression column type jibs), which are formed in the shape of a flat east. Of these, the latter is preferred in terms of production cost and weight. A compression column type jib is considered advantageous. On the other hand, there are generally two methods for storing the supplementary jib: an under-holding type in which the jib is folded downwards of the boom, and a side-holding type in which the jib is folded on the lateral side of the boom. In both of these storage methods, the vertical thickness due to the boom and jib becomes larger in the case of the lower holding type, so
Visibility when driving becomes narrower, especially side visibility. In addition, if you try to improve visibility, the overall height of the crane vehicle will increase, which also poses a problem when traveling. On the other hand, in the case of the side-carrying type, although the side visibility is widened, the thickness in the left-right direction is also large, which poses a problem in that it makes it difficult to turn on narrow roads.

Conventionally, in order to ensure both side visibility and the ability to run in narrow spaces, when using a compression column type jib, we have taken into consideration the ability to run in narrow spaces and have adopted a lower-hugging retraction system, while using a truss type jib. In some cases, a horizontal storage system has been adopted in consideration of side visibility, but the reality is that this is not a fundamental solution as problems with either side remain.

In addition, regarding the work of extending and retracting the jib, in the above-mentioned horizontal holding method, the jib is held on a horizontal plane from the side to the front with a
In order to rotate simultaneously, a large space must be secured on the sides. In addition, with the lower holding method, it was very troublesome to rotate the jib from the bottom to the top and pass the main hook between the jib feet when extending it. In addition, since it is necessary to pass the main hook between the jib feet in this manner, the distance between the jib foot and the proximal connecting rod must be sufficiently large, which is disadvantageous in terms of the strength of the jib.

The present invention has been made in view of the above circumstances, and it is possible to reduce the vertical and horizontal thickness to a minimum in the retracted state, thereby ensuring both side visibility and maneuverability in narrow spaces when driving. To provide a method for extending and storing a supplementary jib in a wheel-type crane by which the jib can be easily extended and stored even in a narrow space.

The present invention adopts a side-hugging storage method for a compression column type jib.The basic feature is that when stored, the jib is folded onto the side of the boom in a vertical position with its thickness direction facing left and right, and when extended. The jib is suspended in a vertical position and then twisted and rotated around an axis along the axis of the jib to convert the jib to an extended position facing downward in the thickness direction. In addition to this, the jib guide provided on the boom side and the jib side are equipped with a jib guide provided on the boom side and an operation for moving the jib vertically to the vertical position when the jib is extended, and an operation for pulling the jib from this vertically hanging position to the lateral side of the boom. Another feature of the present invention is that the jib guide mechanism is made up of an engaging body and the boom is extended and retracted.

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show the jib in an extended state, and FIGS. 3 and 4 show the jib in a retracted state. 1 is 4TNfa-j
- 2 is a suspension rod supporting EE collapsing type supplementary jib (hereinafter simply abbreviated as jib), and 3 is a suspension rod. Note that the telescoping boom 1 is actually configured in a multi-stage telescoping type consisting of a fixed boom and several stages of movable booms, but in order to make the explanation easier to begin with, the boom 1 will be assumed to be a fixed boom. It has a one-stage telescoping structure consisting of a base end boom 1A and a movable tip boom 1B. Furthermore, the left and right direction hereinafter refers to the direction seen from the driver's seat. As is well known, the jib 2 includes a pair of side rods 2a made of flat rectangular pipes or the like.

A large number of connecting rods 2C... are fixed between the rods 2b, and the entire rod is formed into a flat frame shape with a tapered end.

There are boom point pins 4 on both left and right sides of the tip of the boom 1, that is, the tip of the tip boom 1B (boom point).
, 5 are rotatably mounted around the pin axis X, and when the jib is extended, the left and right feet 6.7 of the jib 2 are engaged with the boom point pin 4.5. The left and right jib feet 6.7 are both bifurcated.

However, the left side jib foot B is formed into a fork shape in which the three pieces forming the bifurcation are equal in length, and the right side jib foot 7 is formed into an uneven fork shape in which the length of the - piece is shorter than the other pieces. There is. Both of these jib feet 6.7 are formed separately from the jib body, that is, the side rods 2a, 2b, and the right side jib foot 7 is fixed to the base end of the right side rod 2b.

On the other hand, the left side jib foot 6 integrally has a male threaded portion 6a as shown in FIG.
It is screwed into a socket 6b fixed to the inside of the proximal end of the socket 6b. In this way, the left side jib foot B is attached to the base end of the jib left side rod 2a so as to be able to rotate around the side rod axis y. In addition, the right side jib foot 7 has a bottle hole 9, and the left side jib foot 7 has two bottles L8a and 8b at the tip and middle part, of which the bottle hole 8b in the middle part is made into a long hole. is forming. Further, pin holes 4a and 5a are provided in the boom point pins 4 and 5 on both the left and right sides in the radial direction.

As shown in Fig. 6.4, when the jib 2 is stored, it is folded in a vertical position with its thickness direction facing left and right along the left side of the base end boom 1A. is fixed to the proximal boom 1A at two locations, the distal end and the proximal end. That is, first, to explain the tip end side of the jib, as shown in FIGS. 1 to 4, as well as FIGS. On the other hand, a box-shaped bracket 12 with openings on both sides in the axial direction of the boom is protruded from the left side surface of the base end of the base end boom 1A, and the engagement bin 111 can be engaged with this bracket 12 from the front. It is configured as follows. The bracket 12 and the engagement pin 11 have bottle holes 12 a and 11 that vertically match when the jib is stored.
'a is provided in the bottle holes 12a and 11a, and the tip fixed bottle 1. Insert lS and press engagement bottle 11) Soto 12
I am trying to fix it. On the other hand, as shown in FIG. 9, the jib proximal end is fixed using a bracket with a pin hole protruding from the side surface of the proximal end boom 1A and the jib connecting rod 2C or from the left side rod 2a. This is done by connecting the parts with the fixing pin 16.

To explain the jib guide mechanism, on the jib 2 side, a rotatable 4f roller 18 as an engaging member is protruded from the side surface of the right side rod 2b (the upper surface when the jib is stored) via a bracket 17. On the other hand, on the boom 1 side, the base end boom 1A
A jib guide 19 in the form of a groove track to which the roller 18 can be engaged and disengaged is provided on the left side surface near the tip of the jib (the side surface where the jib is stored).

This jib guide 19 has a pair of 10F guide frames 20 and 21 bent in the shape of a square on the left side of the boom at the base end.
By fixing it in 4 rows, the water y17-groove 22 in the srλ row with the boom axis direction and the inclined groove 26 that increases toward the boom tip side are connected and connected, and the side surface and both ends are It has an open groove track shape. In addition,
The lower guide frame 21 is formed in the shape of a flat plate, and the upper guide frame 20 is formed in the shape of a frame having a horizontal cross-section and a protruding edge 20a for preventing the roller 18 from coming off laterally. Further, the tip opening 23B of the inclined groove 23 opens diagonally downward from the lower end of the left side of the proximal boom when the boom 1 is viewed horizontally, and the roller 18 is connected to the jib guide 19 through this tip opening 23a. Disconnect.

Reference numeral 24.24 denotes a suspension rod mounting seat, which is provided to protrude upward from the left and right side rods 2a, 2b at the tip of the jib 2, and is mounted on the suspension rod 5.24 when the jib is in use or stored. Attach one end of the filter to this mounting seat 24.24 and attach the bottle 25.25.
I'm trying to stop it. In addition, in order to store the suspension rods 3, 3 in the jib 2 when the jib 2 is stored, there are L-shaped rod receivers 26, 26 on both left and right sides of the base end of the jib 2.
At the middle part of the jib 2, there are rod holders 27. on both left and right sides.
27 are provided respectively. This rod holder 27.
27, as shown in FIGS. 10 and 11, respectively, a U-shaped holder main body 28, an opening/closing link 29 that opens and closes the upper opening of the main body 28, and a link 29 that is always biased in the main body closing direction. It consists of a torsion coil spring 30 that
When the rod is stored, the main body 28 is closed by the opening/closing link 29 to hold the rod 3, and when the rod is used, the link 29 is closed.
It is configured such that the rod 3 can be removed from the main body 28 by opening. 28a is a bottle that holds the opening/closing link 29 in an open state.

Moreover, 31.31 is a handle for jib twist provided on both left and right sides of the tip of the jib 2.

Finally, a method for extending and retracting the jib 2 according to the present invention will be explained.

The jib 2 is placed on the left side of the base end boom 1A in a vertical position with the right side rod 2b in the extended state being up and the left side rod 2a being down, as shown in Figs. 6 and 4 in the retracted state. In this state, the above-mentioned engagement pin 11 at the tip of the jib is engaged with the bracket 12 at the base end of the proximal boom 1A and fixed with the tip fixing pin 13, and the brackets 14 and 15 are fixed at the base end. By fixing with the fixing bin 16, the jib 2 is fixed in the stored position. In addition, in this jib storage state, the rollers 18 of the jib 2 are engaged with the horizontal grooves 22 in the jib guide 19 as shown in FIGS. 8 and 9. Therefore, the jib 2 is extended by the following procedure.

(b) With the crane's outriggers (not shown) extended to stabilize the aircraft, fully retract the boom 1 and point it to the side or rear of the aircraft in a horizontal position.

(As shown in Step 12 [fbl), remove the jib tip fixing bin 16, and insert the bin 16 across the bin hole 4a of the left boom point bin 4 and the intermediate bin hole 8b at 6° of the left jib foot. Thereby, the left jib foot 6 and the boom point bin 4 are connected, and the jib tip end fixing bin 16 is used as a jib foot bin.

(c) Remove the jib base end fixing bin 16, this bin 16
will later be used as the foot bin for the right side jib hood.

2) As shown in Figures 1+ and 14, raise the boom 1 to about 80 degrees and extend it until it comes off the roller 18 or jib guide 19 (about 60 cm). As a result, the jib 2 rises together with the tip boom 1B, and the rollers 18 of the jib 2 enter the inclined groove 23 from the horizontal groove 22b in the jib guide 19 of the proximal boom 1A and roll in the inclined groove 26. As a result, the jib 2 rises and rotates forward around the axis X of the boom point bin 4, detaches from the base end boom 1A, and assumes a vertical posture.

(e) Next, fold down boom 1 and press the tip (lower end) of the jib.
Lower the handles 3i, 3i to a height where they can be operated from the ground.

(to) Holding the handles 51 and 31, move the jib 2 along the jib axis (
The right jib foot 7 is engaged with the right boom point bin 5 by twisting and rotating the jib foot 7 around the vertical axis (vertical axis) y by 255 degrees (from the state shown in FIG. 14 to the state shown in FIG. 15 and then to the state shown in FIG. 16).

In this way, since the jib 2 is twisted and set at the tip of the boom, the main 7 hook (not shown) suspended below the boom tip sheave block 62 can be easily passed over the base end of the jib 2. can. Alternatively, if you lower the main hook to the ground in advance at this time, you only need to change the hanging wire of the hook, so you can pass the main hook through the base end of the jib when extending the jib, as in the case of the conventional under-carrying type. You will no longer have to struggle with your work. Moreover, since the distance between the jib foot 6.7 and the proximal connecting rod 2C can be smaller than the conventional one, it is advantageous in terms of jib strength.

(g) Fix the tip of the auxiliary winding wire 54 passed through the auxiliary sheave 33 of the tip boom 1B to the tip of the jib 2, and wind the wire 34 around the auxiliary so that the jib tip is approximately 1 m above the ground. While removing the boom 1, or while extending the tip boom 1B, lower the boom 1 further.

(7) After lowering the boom 1 horizontally or slightly below, insert the previously removed jib base end fixing bin 16 into the bin hole 9 of the right jib foot 7 and the right boom point bin 5 as shown in FIG. This prevents the jib hood from coming off from the boom point pin 5. Also, in lrJ (b), pin holes 8b and 4 of the left jib foot 6 and the left boom point pin 4 are
Remove the jib tip circumferential pin 13 inserted into the first
As shown in FIG. 8, insert the pin 16 into the tip hole 8a of the jib foot 6. In addition, when replacing the pin 13, the pin 13 can be easily removed because the intermediate pin hole 8b of the left jib foot 6 is made into a long hole. In this manner, the left jib foot 6 and the left boom point pin 4 are brought into close contact when the jib is extended.

(S) Connect the base end and middle part of the suspension rod 6.3 to the rod receiver 26.26 and the rod holder 2.
7.27 and attach the base end of the rod to the sheave block 32 of the tip boom 1B as shown in FIG. This allows the suspension rod 3. '5 is suspended between the jib 2 and the tip boom 1B to support the jib 2.

body) Seal stone, wire filter 4 to sheave block 3 of jib 2
5 and attach an auxiliary hook 36 to its tip.

In the above manner, the extension of the jib 2 is completed.

Furthermore, the jib 2 is stored in the reverse order to the above-mentioned extension procedure. To summarize the main points, the boom 1 is tilted horizontally or slightly lower, and the length is slightly extended (for example, 60 to 700 m) rather than fully retracted.

Next, after attaching the tip of the auxiliary winding wire 64 from the auxiliary hook loop 6 to the tip of the jib, the suspension rod 6.3 is removed and stored in the jib 2 while the jib 2 is supported by the wire 34. do. Then, the jib tip fixing pin 13 used as the left jib foot pin was fixed (
A) and reinsert the jib base end fixing pin 1 in the opposite direction.
6 from the right side jib foot 7. After that, by loosening the auxiliary winding wire 34 without raising the boom 1, (
Alternatively, by extending the tip boom 1B by about 2 m in advance and then contracting the boom 1B), rotate the jib 2 downward to hang it in a vertical position, remove the auxiliary winding wire 54, and then move the jib 2 along the axis. Rotate about 255'l [=1 around y.

Next, when the boom 1 is raised to nearly 800 degrees, the roller 18 of the jib 2 will be in a position facing the tip opening 23a of the inclined groove 23 in the jib guide 19. Therefore, if the boom 1 is retracted in this state, the roller 18 will be The roller 18 enters the inclined groove part 23 and rolls in the inclined groove part 23 toward the horizontal groove part 22 as the boom retracts. Due to the jib guide action of this roller 18 and jib guide 19, the jib 2
is automatically and forcibly drawn to the left side of the base end boom 1A, and is finally folded into the posture shown in FIGS. 3 and 4.

In such a situation of the jib guide action, that is, a situation in which the roller 18 enters the intermediate groove part 26 from the tip opening 23a of the inclined groove part 23, then moves in the inclined groove part 23 and reaches the horizontal groove part 22, the jib guide 19 is in an open groove. Because there are tracks, the operator in the driver's seat can see it. Therefore, there is no possibility of misoperation of the jib guide, and
This gives the operator a sense of security.

Therefore, by setting both the distal end and proximal end fixing bins 16 and 16 in the state shown in "-", the jib 2 is fixed in the stored state.

As described above, when using the method of the present invention, the jib 2 is stored along with the boom 1 in a vertical position with its thickness direction facing left and right. The total thickness dimension in the direction can be minimized.

Also, of course, the thickness in the vertical direction can be reduced to the minimum thickness of one Zoboom. Therefore, it is possible to simultaneously ensure side visibility while driving and maneuverability in narrow spaces.

Moreover, when extending and retracting the jib 2, by twisting and rotating the jib 2 in a vertical position around the vertical axis y, the jib 2 can be changed from a vertical position (position when stowed) to a horizontal position (position 7 when extended) or vice versa. Since this is changed, there is no need to secure a wide sideward turning space for the jib as in the conventional method even though it is a side-hugging storage system, and the jib 2 can be easily extended and stored even in a narrow place.

In addition, the jib 2 can be changed from a position along the boom 1 to a vertical position (when extended) or vice versa (when retracted) by the guide mechanism consisting of the jib guide 19 of the boom 1 and the rollers 18 of the jib 2, and the expansion and contraction of the boom 1. Since the position can be changed automatically, the jib extension and retraction work can be made more efficient. In addition, since the jib guide action can be visually confirmed from the driver's seat, there is no risk of erroneous operation, and the operator can feel secure.

In addition, in the above embodiment, the left foot 6 of the jib 2 was configured to be rotated around the axis y by screw rotation.
A bearing structure may be adopted instead of the screw rotation structure.

Regarding the guide mechanism, the horizontal groove portion 22 of the jib guide 19 is effective in further stabilizing the stored state of the jib 2, but is not necessarily necessary, and the entire jib guide 19 may be formed in an inclined shape. Further, the engaging body is not limited to the roller 18 mentioned in the above embodiment, but a double-wheeled roller or a simple bottle may be used. Regarding the right side jib foot 7, in the above embodiment, one of the three pieces was formed in a bifurcated shape with short steps, but as shown in FIG. It may be formed into a shape. With this shape, when the jib 2 is hung vertically and rotated in a twisting manner, the right side jib foot 7 is moved to the right side boom point bin 5 due to the center of gravity of the jib.
When the jib 2 is tilted to a lower position, by hooking the jib foot 7 to the right boom point pin 5, both 7 and 5 can be temporarily connected. Further, according to the basic embodiment in which the right side jib foot 7 is formed into a bifurcated shape with different steps, the boom point pin 5 of the foot 7 is
Even if the right side jib foot 7 is formed into a bifurcated shape with the same three pieces of equal length as the left side jib foot 6, the intended purpose of the present invention can be sufficiently achieved.

As described above, according to the present invention, although it is a side-hugging storage type of jib, it is possible to minimize the horizontal thickness dimension of the boom and jib in the retracted state, so that it is possible to reduce the horizontal thickness dimension of the boom and jib to the minimum when the jib is side-hugging. While ensuring side visibility, it is also easier to enter narrow spaces. Moreover, the jib can be easily extended and stored even in narrow spaces, and in particular, the jib can be stored using the guide mechanism, which consists of an inclined groove track-shaped jib guide and an engaging body that engages with the jib guide, and the telescopic movement of the boom. Since the position can be automatically changed from the vertical position to the vertical position or vice versa, the jib extension and retraction operations can be made more efficient. Furthermore, by forming the jib guide into an open groove track shape with open side portions and both ends, the status of the jib guide function can be visually checked from the driver's seat, thereby preventing erroneous guide operations. A sense of security can be given by the operator's own confirmation.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which FIG. 1 is a side view of the jib in its extended state, FIG. 2 is a plan view of the same, FIG. 3 is a side view of the jib in its retracted state, FIG. 4 is a plan view of the same, and FIG. The figure is an enlarged perspective view of the jib foot part, Fig. 6 is an enlarged view of part A of Fig. 4, and Fig. 7 is an enlarged perspective view of the jib foot part.
Figure 8 is an enlarged view of the construction section in Figure 6. Figure 9 is a sectional view taken along line ■-■ in Figure 8. Figure 10 is an enlarged view of the side part in Figure 4. , Fig. 11 is a sectional view taken along the line XI-XI in Fig. 10, Fig. 12 (,) is a schematic side view showing the pre-extension state, and Fig. 12fb) is a view of the left jib foot section in the same state. An enlarged view, Fig. 13 is an enlarged side view of the guide mechanism in the middle of moving the jib toward a vertical position, Fig. 14
The figure is a schematic side view of the same jib in a vertical position.
Schematic side view when rotated by 0°, No. ``17''
18 and 18 are side views showing a state in which the jib foot is set in the jib extended use position, FIG. 19 is a schematic side view showing the fully extended state, and FIG. 20 is a side view showing a modified example of the right side jib foot. . 1... Telescopic boom, 1A... Base end (fixed) boom,
1B... tip (movable) boom, 2... jib, 6...
・Suspension rod, 4.5... Boom point bin, 6... Bifurcated left jib foot, 7... Right side jib foot, 18... Engaging body (roller) constituting the guide mechanism, 19...・Same jib guide, 20.21...
- Guide frame, 23... Slanted groove portion, 23a... Tip opening, X... Boom point bin axis, y... Jib axial direction axis. Patent Applicant: Kobe Steel, Ltd. Figure 7 Figure 9 Figure 9 Agency Director Shima 1) Haruki Tono1, Indication of the case Patent Application No. 61988, filed in 1982, 2. Invention 0 Title Extending and retracting the supplementary jib in a wheeled crane 3, Person making the amendment Relationship with the case Patent applicant name Name (119) Kobe Steel Co., Ltd. 4, Agent 1920, Month, Day (Voluntary amendment) 6, Subject of amendment Z Contents of amendment (1) 1 on page 13, line 4 to line 5 of the specification ``Horizontal groove portion 22b'' is corrected to ``1 horizontal groove portion 22''. (2) In the first line of page 17 of the specification, it says “Turn boom 1 to 80
"up to nearly 80 degrees" should be replaced with "up to nearly 80 degrees with boom 1 extended to a certain length, for example 60cm to 70cm"
I am corrected. (3) In the 17th page of the specification, lines 13 and 14, the phrase ``the situation in which one enters into, and reached...'' is corrected to ``the situation in which one enters...''. (4) On page 22, line 10 of the specification, it says, “The jib should be
5°" should be corrected to ``Jib approximately 165°.'' (5) Correct the drawing No. 2 as shown in the attached sheet.

Claims (1)

[Claims] 1. Equipped with a telescoping boom consisting of a fixed boom and a movable boom, and a suspension rod-supported compression column type replenishment jib that is added to the tip of the telescoping boom. In a wheeled crane that is supported rotatably around the pin axis by boom point pins provided on both the left and right sides in a horizontal position along the left and right direction, the jib feet on both the left and right sides of the above-mentioned filling jib are It is formed into a bifurcated shape that can be attached to and detached from the boom point bins on both sides, and one of the jib feet is configured to be rotatable around an axis along the jib axis direction, while the jib is retracted in the fixed boom of the telescopic boom. By fixing a pair of upper and lower guide frames parallel to each other in an inclined position toward the tip of the boom, a grooved track-shaped jib guide with openings at both ends and sides is formed. , on the jib side, an engaging body that can be engaged and detached from the tip opening of the jib guide is provided protrudingly,
When storing the jib, place the jib in a vertical position with its thickness direction facing left and right, and with the above-mentioned engagement 1 assembly engaged in the jib guide, and place it against the side surface of the boom. By extending the boom with the jib foot, which can be rotated around the jib axis, engaged and connected to one of the boom point pins, the jib is suspended in a vertical position by the guiding action of the jib guide and the engaging body. By rotating the jib around the axial axis and engaging the other jib foot with the boom point pin on the corresponding side, extend the jib to the tip of the boom in a flat position, and then reverse the procedure to extend the jib. A method for extending and storing a supplementary jib in a wheel-type crane, characterized in that the jib is stored in a vertical position on the side surface of the boom.