JP2525509Y2 - Crane boom - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane boom that lifts and moves a heavy object. More particularly, the present invention relates to a multi-stage boom having an outer boom of a small crane and an inner boom retractably stored in the boom.

[0002]

2. Description of the Related Art As a boom of this type of crane, there is known a crane which is configured so that an inner boom can be pulled out or housed from an outer boom by a hydraulic cylinder attached between the outer boom and the inner boom. Also, a hole is formed near the tip of the outer boom, and a plurality of boom fixing holes are formed at predetermined intervals in the longitudinal direction of the inner boom housed in the outer boom so that the inner boom can be pulled out. After pulling out or storing the inner boom from the outer boom so that any of the fixing holes match, the boom is fixed by changing the total length of the boom in several steps by inserting boom pins into both matching holes. What is composed is known.

[0003]

However, the boom using the hydraulic cylinder has a problem that the cost is increased. Also, in the case of a boom in which a pin is inserted into both of the matched holes, the pin must be inserted by matching the boom fixing hole of another inner boom with the hole of the outer boom every time the total length of the boom is changed. However, there was a troublesome problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a crane boom capable of changing the entire length by extremely simple operation and shortening the time for switching between use and non-use of the crane.

[0005]

The configuration of the present invention for achieving the above object will be described with reference to FIG. 1 corresponding to an embodiment. The present invention includes a main shaft 14 erected on a support 13 fixed to a base 12a so as to be pivotable, a bracket 16 fixed to the main shaft 14 and extending upward, and a base end pivotally supported by the bracket 16 to turn up and down. A possible outer boom 18; an inner boom 29 retractably housed in the outer boom 18 and having a pulley 31 at its tip; and a winch 2 attached to either the base 12a, the support 13 or the bracket 16.
7, which are routed from the winch 27 via a pulley 31, are fed or wound by the winch 27, and have a hook 2 at the tip.
A crane provided with a wire 27a to which 7b is fixed, the locking means 44 having a claw 49d mounted inside the base end of the inner boom 29 and protruding outside the inner boom 29 so as to be retractable into the inner boom 29; An operation lever 56 attached to the distal end of the inner boom 29, and one end attached to the locking means 44 and the other end attached to the operation lever 56 through the inner boom 29 and the operation lever 56
And a plurality of locked holes 18a, 18b, formed at predetermined intervals in the longitudinal direction of the outer boom 18 and capable of selectively locking the claw 49d, with the cable 57 for drawing the claw 49d into the inner boom 29 at the time of the operation. 18c.

[0006]

When the crane 11 is used, the outer boom 18 is held substantially horizontally, and the winch 27 is operated to draw out the wire 27a. By operating the operation lever 56, the claw 49d is pulled into the inner boom 29 via the cable 57. In this state, the inner boom 29 is pulled out from the outer boom 18. When the total length of the booms 18 and 29 reaches a desired length, the operation lever 56 is released, and the inner boom 2 is released.
When the slide 9 is slightly slid with respect to the outer boom 18, the claw 49d is locked in the locked hole 18c located in the vicinity thereof. When the crane 11 is not used, the diagonally upward booms 18, 29 are held substantially horizontally. In this state, the operating lever 56 is operated to pull the claw 49d into the inner boom 29, and the inner boom 29 is stored in the outer boom 18. When the operating lever 56 is released when the total length of the booms 18 and 29 becomes the shortest, the claw 49d is locked in the locked hole 18a, and the wire 27a is wound by the winch 27.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 to 8, a crane 11 is mounted on a front portion of the bed 12 a of the double cab truck 12 (FIG. 8). The crane 11 includes a support 13 fixed to one side of the loading platform 12a, a hollow main shaft 14 erected on the support 13 so as to be pivotable, a bracket 16 fixed to the main shaft 14 and extending upward, An outer boom 18 pivotally supported by the bracket 16 via a flange 17 and an inner boom 29 housed in the outer boom 18 so as to be drawn out are provided (FIG. 1).

The support 13 is fixed on the tire house 12b of the left rear wheel 21 via a substrate 22. As shown in detail in FIG. 6, an upper plate 13a is fixed to the upper surface of the support 13 horizontally, and an inner plate is provided in the lower support 13 at a predetermined distance from the plate 13a in parallel with the upper plate 13a. The plate 13b is fixed.
A bearing 13c for rotatably holding substantially the center of the main shaft 14 is fixed to the center of the upper plate 13a, and a bearing 13d for rotatably holding the lower end of the main shaft 14 to the center upper surface of the inner plate 13b is fixed. . Upper plate 13a
A worm wheel 24 is fixed to the main shaft 14 located above the worm wheel 24, and a worm 26 meshing with the worm wheel 24 is rotatably mounted via a holder (not shown) fixed to the upper surface of the upper plate 13a. . A tip of an operation shaft 26a provided integrally with the worm 26 is formed so that the turning operation handle 23 can be locked (FIGS. 1 and 7). The main shaft 14 is turned by locking the handle 23 to the operation shaft 26a and rotating.
Guide wheels 38 and 39 are rotatably mounted on the support 13 and the upper portion of the main shaft 14 below the inner plate 13b, respectively.

The bracket 16 has a base plate 16a fitted into the upper portion of the main shaft 14 and fixed horizontally, and a side plate 16 erected on the base plate 16a.
b, and a pair of support plates 16c and 16d provided on the base plate 16a and arranged perpendicular to the side plate 16b and parallel to each other. A support shaft 28 is provided on the upper ends of the pair of support plates 16c and 16d. The outer boom 18 is formed by bending a steel plate into a rectangular tube shape, and a flange 17 composed of a pair of parallel plates 17a and 17b is fixed to both side surfaces of the base end. The outer boom 18 is pivotally supported by the bracket 16 by inserting a support shaft 28 in the vicinity of one corner of the flange 17, and a guide wheel 33 is rotatably mounted substantially at the center of the flange 17 (FIGS. 1 and 6). Outaboom 1
An inner boom 29 formed in the shape of a rectangular tube is housed in the cylinder 8 so as to be able to be pulled out, and a pulley 31 is attached to the tip of the inner boom 29 (FIGS. 1 and 7).

Locking means 44 is provided inside the base end of the inner boom 29. The locking means 44 includes a locking bracket 46 mounted on the upper surface of the inner boom 29, as shown in detail in FIGS. , This bracket 46
A locking shaft 47 rotatably supported on the shaft 47, a locking arm 48 having a proximal end fixed to one end of the shaft 47, and a locking member 49 having a proximal end fixed near the other end of the shaft 47. And a locking lever 51 pivotally supported at substantially the center of the locking bracket 46. The lock bracket 46 is formed by bending a plate material, and
A base member 46a in close contact with the inner upper surface, a pair of side members 46b, 46c arranged on both side edges of the base member 46a at right angles to the base member 46a and parallel to each other in the longitudinal direction of the inner boom 29; The base member 46a and the side members 46b, 46c are provided at both end edges of the member 46a.
A pair of cross members 46d, 46e arranged orthogonally to
And The lock shaft 47 is rotatably mounted between the pair of cross members 46d and 46e, and the base end of the lock arm 48 is a lock shaft 47 projecting outward from the lock bracket 46 from one of the cross members 46d. It is fixed to one end. The locking member 49 is formed by bending a plate material, and includes a base member 49a and a pair of side members 49b and 49c disposed on both side edges of the base member 49a. The base ends of the pair of side members 49b and 49c are fitted to the locking shaft 47 inside the other cross member 46e, and the base member 49a
A claw 49d is formed at the tip of the first member so as to be bent substantially in an L shape and protrude outside the inner boom 29. The claw 49d can be pulled into the inner boom 29 with the rotation of the lock shaft 47 (FIG. 3).

The lower portion of one side member 46b of the lock bracket 46 is bent toward the other side member 46c, and the lower outer surface of the bent one side member 46b is formed in a substantially L-shape. A substantially center of the locking lever 51 is pivotally mounted. One end of the locking lever 51 is engaged with the tip of the locking arm 48, and the other end of the cable 57 is connected to the cable 57.
Locks at one end. A torsion coil spring 52 is loosely fitted to the locking shaft 47 between the pair of side members 49b, 49c.
6 is in contact with the inner surface of the other side member 46c, and the other end is bent in an inverted U-shape and locked to the base end of the base member 49a of the locking member 49. The spring 52 urges the locking member 49 in a direction in which the claw 49d protrudes out of the inner boom 29, and the locking member 49 abuts against a stopper 46f formed at the lower end of the other cross member 46e of the locking bracket 46. It comes into contact.

As shown in FIG. 5, a lever mount 53 is fixed to the tip of the inner boom 29 above the pulley 31,
A lever holder 54 is mounted on the upper surface of the mounting base 53, and an operation lever 56 is rotatably mounted on the holder 54 via a shaft 55. A cable 57 having one end locked to the other end of the locking arm 48 of the locking means 44 is covered by the outer cable 58 and passes through the inner boom 29, and the other end of the cable 57 is attached to the tip of the inner boom 29. The operation lever 56 is locked. When the operating lever 56 is operated in the direction of the solid line arrow, the cable 57 moves in the direction of the dashed line arrow. Further, three locked holes 18a, 18b, 18c are formed in the outer boom 18 at predetermined intervals in the longitudinal direction thereof,
A claw 49d protruding outside the inner boom 29 is selectively locked in the locked holes 18a, 18b, 18c (FIG. 1).

The outer boom 18 is a jack 1 in this example.
9 is turned up and down by expansion and contraction. The lower end of the jack 19 is located substantially at the center of the bracket 16 with a pipe 19.
b and the first shaft 41, and the vicinity of the upper end is pivotally supported by the lower end of the flange 17 via the shaft 19d, the cap 19c, and the second shaft 42. In this example, the jack 19 is a multi-stage screw jack, and an operation shaft 19 a protrudes below the jack 19. The proximal end of the extension member 19e is locked to the distal end of the operating shaft 19a, and the operating handle 32 for raising and lowering is locked to the distal end of the extension member 19e.
The jack 19 expands and contracts by locking the handle 32 to the extension member 19e and rotating.
(FIGS. 1 and 6).

On the right rear wheel house 12c, a receiving member 20 is erected via a substrate 43.
Are two pillars 20a (one of the two pillars is not shown), a lower plate 20c horizontally fixed to the upper end of the pillar 20a, and an upright standing on the lower plate 20c to be parallel to each other and upward. It has a pair of support plates 20d extending (one of the two support plates is not shown). On the upper surface of the lower plate 20c, an inverted U-shaped locked member 20f for locking a hook 27b described later is fixed, and a receiving plate 20g is provided substantially at the center of a pair of support plates 20d in parallel with the lower plate 20c. It will be erected. A concave portion 20h into which the tip of the inner boom 29 can be inserted is formed by the upper portions of the pair of support plates 20d and the receiving plate 20g. A concave groove 20i into which a wire 27a to be described later can be loosely inserted is formed in the receiving plate 20g, and two rubber plates 20j are formed on the upper surface of the receiving plate 20g.
(One of the two rubber plates is not shown) is attached (FIG. 1). In a state where the tip of the inner boom 29 housed in the outer boom 18 is inserted into the recess 20h of the receiving member 20, the outer boom 18 is formed to be curved along the upper surface of the roof panel 12e of the cab 12d. It is substantially flush with the upper surface of the roof panel 12e. The inner boom 29 is formed so as to be slidable in the outer boom 18 (FIG. 8).

The bed 1 inside the left tire house 12b
A winch 27 is mounted on 2a via a substrate 22 (FIG. 1). The wire 27a fed or wound by the winch 27 passes through the main shaft 14 and the booms 18 and 29, and is routed via guide wheels 38 and 39, guide wheels 33 and pulleys 31. A hook 2 is attached to the tip of the wire 27a.
7b is fixed (FIGS. 1 and 2). Support 13, spindle 14, bracket 16, flange 17 and winch 27
Is covered by a cover 36, and the receiver 20 is covered by a cover 37 (FIGS. 1 and 8).

When using the crane 11 constructed as described above, the winch 27 is operated to loosen the wire 27a, and the hook 27b is moved from the locked member 20f in the receiving member 20 to the hook 27b.
Remove. The jack 1 is rotated by rotating the undulating operation handle 32.
The distal end of the inner boom 29 is detached from the concave portion 20h of the receiving member 20 by extending the outer boom 18 in the direction of the solid arrow in FIG. After turning the operation handle 23 to rotate the main shaft 14 so that the hook 27b is located substantially at the center of the loading platform 12a, the jack 19 is contracted to hold the outer boom 18 substantially horizontally, and the wire 2
Feed out 7a. When the operating lever 56 is operated in the direction of the solid arrow in FIG. 5, the cable 57 moves in the direction of the solid arrow in FIG. 4, the locking lever 51 rotates in the direction of the dashed arrow, and the locking arm 48 is dashed line. Rotate in the direction of the arrow. The rotation of the locking arm 48 causes the locking member 49 to rotate in the direction of the two-dot chain line arrow via the locking shaft 47, and the claw 49 d is pulled into the inner boom 29. In this state, when the inner boom 29 is pulled out from the outer boom 18 and the operation lever 56 is released when the total length of the booms 18 and 29 reaches a desired length, the inner boom 29 is attached to the torsion coil spring 52 loosely fitted to the locking shaft 47. Energized locking member 4
9 rotates the pawl 49d in a direction to protrude out of the inner boom 29, and simultaneously operates the operating lever 56 in the direction of the broken arrow in FIG. Rotate.
Here, when the claw 49d does not coincide with the locked hole 18c of the outer boom 18, the inner boom 29 is slightly slid with respect to the outer boom 18 so that the claw 49d is formed.
Is locked in a locked hole 18c located in the vicinity thereof, and the booms 18 and 29 are fixed to a desired length.
Is turned obliquely upward, the crane 11 can be used by hanging the load 34 on the hook 27b as shown in FIG.

When the crane 11 is not used, the main shaft 1 is moved so that the hook 27b is located substantially at the center of the carrier 12a.
4 is turned to hold the booms 18 and 29 obliquely upward facing substantially horizontally. In this state, the operation lever 56 is operated in the direction of the solid line arrow in FIG. 5 to pull the claw 49d into the inner boom 29, and the inner boom 29 is stored in the outer boom 18. When the total length of the booms 18 and 29 becomes the shortest, the operation lever 56 is released to lock the claw 49d in the locked hole 18a and wind the wire 27a. The outer boom 18 is turned obliquely upward, the main shaft 14 is turned so that the hook 27b faces the receiver 20, and the tip of the inner boom 29 housed in the outer boom 18 is inserted into the recess 20h of the receiver 20. Connect the tip of the inner boom 29 to the rubber plate 2
0j, the hook 27b is connected to the locked member 20f.
And the wire 27a is wound by the winch 27 to tension the wire 27a. As a result, the crane 11 functions as a roll bar for protecting the cab 12d and the occupant. As described above, the inner boom 2 can be operated with a very simple operation.
9 can be pulled out or stored from the outer boom 18, so that the work time for switching the use and non-use of the crane 11 can be reduced. In addition, the total length of the booms 18 and 29 can be changed very easily during use of the crane 11.

In the embodiment, the crane mounted on the double cab truck is described. However, the crane mounted on the carrier of the single cab truck may be used. Further, the crane may be mounted on a vehicle other than the truck or a vehicle other than the vehicle, and may be installed in a place other than the vehicle. Further, in the embodiment, three locked holes for locking the claws of the locking means are formed in the outer boom, but two or four or more locked holes may be formed in the outer boom. Further, in the embodiment, the multi-stage screw jack is used to turn the outer boom up and down. However, the invention is not limited thereto, and a hydraulic jack may be used. In addition, a through hole is formed in the bracket, a plurality of through holes selectively matching the through hole are formed in the flange when turning the out boom up and down, and a pin is inserted into the matching hole and the out boom is stepped. You may make it turn up and down. Further, in the embodiment, the winch is attached to the bed of a truck as a base, but may be attached to a support or a bracket.

[0019]

As described above, according to the present invention, the main shaft is erected on the support fixed to the base, and the base end of the outer boom is turned up and down on the bracket fixed to the main shaft. A pulley is attached to the end of the inner boom that is pivotally supported and is retractably stored in the outer boom, and the tip of the wire that is routed from the winch attached to the base or the like via the pulley and is fed or wound by the winch A locking means is mounted inside the base end of the inner boom, the locking means has a claw projecting out of the inner boom so as to be retractable into the inner boom, and an operation lever is mounted on a distal end of the inner boom, Attached the other end of the cable attached to the lock means to the operation lever through the inner boom,
Since the claws are selectively locked to the locked portions formed at predetermined intervals in the longitudinal direction of the outer boom, the inner boom can be pulled out or stored from the outer boom by an extremely simple operation. As a result, it is possible to reduce the work time for switching between use and non-use of the crane,
Further, it is possible to extremely easily change the overall length of the boom during use of the crane.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line AA of FIG. 8, showing a boom of a crane according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a portion B in FIG.

FIG. 3 is a sectional view taken along line CC of FIG. 2;

FIG. 4 is a perspective view of a locking means of the boom.

FIG. 5 is an enlarged sectional view of a part D in FIG. 1;

FIG. 6 is a sectional view taken along line EE of FIG. 1;

FIG. 7 is a sectional view corresponding to FIG. 1 and showing a state in which the inner boom is pulled out of the outer boom and both booms are raised.

FIG. 8 is a perspective view of a main part of a truck on which the crane is mounted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Crane 12a Carrier (base) 13 Supporting tool 14 Main shaft 16 Bracket 18 Outer boom 18a, 18b, 18c Locked hole 27 Winch 27a Wire 27b Hook 29 Inner boom 31 Pulley 44 Lock means 49d Claw 56 Operation lever 57 Cable

Claims (1)

(57) [Scope of request for utility model registration] 1. A main shaft (14) rotatably provided on a support (13) fixed to a base (12a), and a bracket (16) fixed to the main shaft (14) and extending upward.
An outer boom (18) whose base end is pivotally supported by the bracket (16) and can be turned up and down; and an inner boom (29) which is housed in the outer boom (18) so as to be able to be pulled out and has a pulley (31) at the tip. The base (12a), the support (13) or the bracket (1
6) a winch (27) attached to any of the above, and a winch (27b) which is routed from the winch (27) via the pulley (31), is fed or wound by the winch (27), and has a hook (27b) at the tip. A crane provided with a wire (27a) to which the inner boom (29a) is fixed, wherein the crane is mounted inside the base end of the inner boom (29) and protrudes outside the inner boom (29) so as to be retractable into the inner boom (29). A locking means (44) having a claw (49d) that engages, and an operation lever attached to a tip of the inner boom (29).
(56), one end of which is attached to the locking means (44) and the other end of which is attached to the operating lever (56) through the inner boom (29) and operates the operating lever (56). A cable (57) for drawing the (49d) into the inner boom (29); and a plurality of cables (57) formed at predetermined intervals in a longitudinal direction of the outer boom (18) so that the claws (49d) can be selectively locked. Characterized in that the boom of the crane is provided with the locked holes (18a, 18b, 18c).