JPH0564026U - Outrigger automatic locking device - Google Patents

Abstract

(57) [Abstract] [Purpose] Automatically locks the telescopic beam of the outrigger when fully contracted. The locking and non-locking positions of the operating rod of the locking pin are always kept constant, and the two positions of the operating rod are clearly defined. Eliminate erroneous operations by making them distinguishable. An engaging portion 18 is provided in the middle of an operating rod 16 pivotally attached to the outer end of a lock pin 8 so as to rotate in a plane perpendicular to the beam extension / contraction direction, and the lock pin is provided on the inner cylinder side of the extension beam. The engaging portion 18 is held so as to be held in the disengaged state from the hole.
7 are attached to the outer cylinder 2 and the jack 4 at the tip of the inner cylinder 3, respectively, and at the most retracted position of the telescopic beam shown in FIG. Joint part 18
In order to engage and disengage the outer cylinder side receiving plate 20, the outer cylinder side receiving plate 20 is juxtaposed outside the outer cylinder side receiving plate 19 and the telescopic beam in the expanded state is contracted most. The engaging portion 18 engaged with 19 is pushed out to fit the lock pin 8 into the inner cylinder side pin hole 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is an outrigger used for mobile cranes such as self-propelled cranes and aerial work vehicles, and in particular, it has an expandable telescopic beam formed by inserting an inner cylinder into a certain range of the outer cylinder so that it can expand and contract. A vertical jack is fixed to the tip of the inner cylinder, and at least at the most extended position and the most contracted position of the telescopic beam, the inner tube has pin holes that match one pin hole provided at the tip of the outer tube. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outrigger locking device in which a lock pin, which is bored and is always fitted into and urged by an inner cylinder side pin hole, is attached to an outer cylinder side pin hole.

[0002]

[Prior Art]

 Conventionally, as shown in FIGS. 9 and 10, a cylinder C having a lock pin A and a compression spring B for constantly pressing and urging the lock pin A is installed on the tip of the outer cylinder D, and the upper end of the cylinder C is The operating rod F engaging with the groove E of the pair of V grooves E and E'which are recessed in is fixed to the upper end of the lock pin A by penetrating it, and the jack J at the tip of the inner cylinder G is brought into contact with the tip of the outer cylinder D. When the operating rod F is engaged with the lower end on the V groove E side at the most contracted position of the retractable beam, the lock pin A fits into the pin hole K on the inner cylinder side, and the lock pin of the crane vehicle or the like is inserted. There is no danger of accidents due to the expansion and contraction of the telescopic beam during running, and when the operating rod F is engaged with the pair of shallow grooves M, M'on the V groove top, on the M'side, The lock pin A slips out of the pin hole K on the inner cylinder side to enable expansion of the telescopic beam, and When the working rod F is engaged with the shallow groove M side, the operating rod projects from the tip of the outer cylinder, and the jack J pushes the operating rod F back into the V groove E when the telescopic beam is contracted most. A device for automatically inserting the lock pin A into the pin hole K by the elastic force of the compression spring B is disclosed in Japanese Utility Model Publication No. 2-15732.

[0003]

[Problems to be solved by the device]

 In this prior art, when the telescopic beam is extended from the most contracted position shown in the figure, the lock pin A is pulled out from the pin hole K, so that the operating rod has to be engaged with the shallow groove M ′. 9 is to be contracted to its maximum from the extended state shown by the chain line in FIG. 9, the operating rod must be engaged with the shallow groove M so that the operating rod can be pushed back into the V groove E by the jack J. However, since the shallow groove for engaging the operating rod F differs depending on whether the telescopic beam expands or contracts, the operating rod may be mistakenly engaged with the shallow groove M ′ when the telescopic beam is contracted to the maximum. Even when the telescopic beam is contracted to the maximum, the inner cylinder G is not automatically locked by the lock pin A, which is very dangerous.

To avoid this, when the lock pin is pulled out from the pin hole on the inner cylinder side, the operating rod F is always engaged with the shallow groove M, so that the telescopic beam is extended from the most contracted position shown in the drawing. In order to pull the lock pin A out of the pin hole K by urging the operating rod in the engaging direction with the shallow groove M with one hand, at the same time with the other hand, the heavy inner cylinder G with jack is attached to the outer cylinder. Since it has to be pulled out from D, the extension operation of the telescopic beam is troublesome and practically difficult to use.

[0005]

[Means for Solving the Problems]

 SUMMARY OF THE INVENTION The present invention addresses the above-mentioned problem. An operating rod that pivots in a plane including the axis lines of all the pin holes of the inner and outer cylinders is pivotally attached to the outer end of the lock pin, and the lock pin is attached to the inner cylinder side. In order to keep it in the state of being disengaged from the pin hole of the operating rod, a receiving plate, which is provided in the middle of the operating rod and in which the engaging portion can abut and engage, is arranged substantially parallel to the telescopic beam at the tips of the inner cylinder and the outer cylinder, respectively. The support plate on the inner cylinder side is placed outside the support plate on the outer cylinder side so that the engaging portion of the operating rod can be disengaged from the support plate on the inner cylinder side at the most contracted position of the telescopic beam. When the telescopic beam in the expanded state is contracted the most, the engaging part or the intermediate part of the operating rod that is engaged with the outer cylinder side receiving plate at the tip of the inner cylinder side receiving plate is pushed out. It is characterized by being configured as follows.

In the device of the present invention, the end portion of the U-shaped operating rod on the side of the lock pin is bent into a V shape within the rotating surface of the U-shaped operating rod, and the lock pin of the V-shaped bending portion is bent. The portion excluding the connecting side to the may be configured as a beam-shaped engaging portion.

Further, as means for aligning the turning surface of the U-shaped operating rod with a plane including the axis lines of all the pin holes of the inner and outer cylinders, a cantilevered support is provided at the tips of the outer cylinder and the inner cylinder, respectively. The width of the plate is set to a certain size so that it can be fitted into the U-shaped operating rod that has a beam-shaped engaging part in the middle, and the outer cylinder base end of the receiving plate cantilevered on the tip of the outer cylinder. A guide plate having the same width as the receiving plate is continuously provided between the side end and the outer cylinder surface corresponding thereto so as to cover the locking pin, and the guide plate between the axis of the locking pin and the surface of the guide plate is provided. The distance in the direction parallel to the plate may be set smaller than the turning radius of the inner edge of the beam-shaped engaging portion with respect to the lock pin.

[0008]

【Example】

 1 and 2 are a vertical sectional front view and a plan view of one embodiment of the present invention at the most extended position of a telescopic beam, in which an outrigger is slidably fitted with an inner cylinder 3 on an outer cylinder 2 which is horizontally mounted on a vehicle body 1. A stopper 6 attached to both inner walls of the outer cylinder 2 including the inserted telescopic beam and a hydraulically actuated vertical jack 4 fixed to the tip of the inner cylinder 3 and having guide rails 5 for guiding the top surface of the inner cylinder. And the stoppers 7 mounted on both sides of the base end of the inner cylinder 3 come into contact with each other at the most extended position of the expansion and contraction beam as shown in the drawing, and the top plate at the tip of the outer cylinder 2 and the reinforcing plate 2a on the inner side thereof. The pin hole 9 (see FIG. 3) formed in the lower portion of the lock pin mounting cylinder 13 mounted vertically between the two is aligned with the pin hole 10 provided in the inner cylinder top plate.

The stopper 12 protruding and fixed to the front end of the bottom surface of the outer cylinder 2 is in contact with the jack 4 at the most contracted position of the telescopic beam shown in FIG. 3 or 4, and the pin hole provided on the top plate of the inner cylinder 3 is provided. 11 corresponds to the pin hole 9 on the lock pin mounting cylinder side. Reference numeral 14 in FIG. 1 is a pin hole provided between the pin holes 10 and 11 of the inner cylinder for restraining the intermediate expansion position of the telescopic beam, and 24 is a hole for pulling out or pushing in the inner cylinder 3 attached to both sides of the jack 4. It is a handle.

The lock pin 8 fitted in the lock pin mounting cylinder 13 by constantly pressing and biasing it with the compression spring 15 is formed with a rod portion 8a having a square or rectangular cross section at its upper portion. Reference numeral 8a passes through an upper closed portion of the lock pin mounting cylinder 13 so as to be slidable in the axial direction, and an open end of a U-shaped operating rod 16 is pivotally attached to the outer end of the rod portion 8a by a shaft 17. .. Therefore, the U-shaped operating rod 16 is rotated in a plane including the axes of all the pin holes 9, 10, 11, 14 of the inner and outer cylinders, that is, in a vertical plane including the extension and contraction axis of the telescopic beam in the illustrated case. ..

The means for aligning the turning surface of the U-shaped operating rod 16 with the plane including the axes of all the pin holes of the inner and outer cylinders is not limited to the above-mentioned configuration, and the U-shaped An arbitrary configuration can be adopted, such as arranging a flat plate-shaped guide for slidably sandwiching the lock pin side end of the operating rod on the outer cylinder 2.

The end portion of the U-shaped operating rod 16 on the lock pin side is bent into a V shape in the rotation plane of the operating rod, and is located in a portion of the V-shaped bent portion excluding the connecting side to the lock pin. Therefore, a beam-shaped engaging portion 18 is formed in the middle of the U-shaped operating rod, and the lock pin 8 is resisted against the pressing force of the compression spring 15 to be inserted from any of the inner cylinder side pin holes 10, 11, and 14. In order to maintain the disengaged state, rectangular receiving plates 19 and 20 with which the engaging portion 18 abuts and engages are cantilevered at the tips of the outer cylinder 2 and the inner cylinder 3 in parallel arrangement with the telescopic beam.

The outer cylinder side rectangular receiving plate 19 is formed by horizontally bending the upper portion of a vertical flat plate 21 planted on the tip top plate of the outer cylinder 2 toward the base end side of the outer cylinder. The rectangular receiving plate 20 on the side is horizontally attached to a mounting member 22 protruding and fixed to the outer wall of the jack 4, and the widths of the receiving plates 19 and 20 can be set arbitrarily. Further, at the most retracted position of the telescopic beam shown in FIG. 3 or 4, the inner cylinder side receiving plate 20 is arranged so that the engaging portion 18 of the operating rod 16 can be disengaged from the inner cylinder side receiving plate 20. They are arranged side by side on the outer side of the outer cylinder side receiving plate 19. Therefore, when the telescopic boom in the extended state is contracted the most, the engaging portion 18 engaged with the outer tubular side receiving plate 19 at the tip of the inner tubular side receiving plate 20 or the intermediate portion of the operating rod is pushed out. It will be. Reference numeral 23 denotes a support plate of the operating rod 16 which is planted on the outer cylinder 2.

Although one embodiment has been described above, the lock pin side end portion of the operating rod is bent into a V shape within the rotation surface of the operating rod, and a part of the V-shaped bent portion is used as an engaging portion. Instead of the construction, a beam-shaped engaging portion can be provided directly in the U-shaped operating rod. FIGS. 7 and 8 show an embodiment in this case, in which the members designated by the same reference numerals as those in FIGS. 1 to 6 are corresponding members.

FIG. 7 is a drawing corresponding to FIG. 4 of the previous embodiment in which the telescopic beam is contracted most. The U-shaped operating rod 16 has a flat plate portion 16b at each leg end of the U-shaped portion 16a made of a round bar. And a beam-like engaging portion 18 is welded between the welded portions. The open end of the U-shaped operating rod 16 is pivoted by a shaft 17 to the outer end of the rod portion 8a of the lock pin 8. So as to hold the lock pin in a disengaged state from the pin hole 11 or the like on the inner cylinder side. And the end of the inner cylinder 3 are cantilevered in parallel with the telescopic beam, and at the most contracted position of the telescopic beam shown in FIG. 7, the beam-like engaging portion 18 is disengaged on the receiving plate 20 on the inner cylinder side. Although the backing plate 20 is arranged in parallel to the outside of the backing plate 19 so as to obtain the same as in the previous embodiment, the lengths of the backing plates 19 and 20 are the same as those in the previous embodiment. It is slightly longer than that of the example.

The widths of the receiving plates 19 and 20 supported on the ends of the outer cylinder 2 and the inner cylinder 3 in a cantilever manner are fixed so that they can be fitted between the flat plate portions 16b and 16b of the U-shaped operating rod 16. A guide having the same width as the receiving plate 19 so as to cover the lock pin 8 between the outer cylinder base end side end of the receiving plate 19 which is held in a cantilever manner at the tip of the outer cylinder and the corresponding outer cylinder surface. The plates 25 are connected in series, and the distance in the direction parallel to the receiving plate 19 between the axis of the lock pin and the surface of the guide plate 25 is defined by the turning radius of the inner edge of the beam-shaped engaging portion 18 with respect to the lock pin. It is set small.

Therefore, the guide plate 25 cooperates with the receiving plate 19 so that the rotating surface of the U-shaped operating rod 16 is not only aligned with the plane including the axis lines of all the pin holes of the inner and outer cylinders, but also on the outer cylinder side. The beam-shaped engaging portion 18 that is in abutting engagement with the receiving plate 19 of the above is pushed to a position where it is removed from the end of the receiving plate on the outer cylinder base end side, and the lock pin 8 is pushed by the elastic force of the compression spring 15. The beam-shaped engaging portion 18 does not interfere with the guide plate 25 when being lowered. As shown in FIG. 7, if the guide plate 25 is tilted downward from the end of the receiving plate 19 on the base end side of the outer cylinder toward the base end side of the outer cylinder, the U-shaped operating rod 16 is moved to the position indicated by the chain line (a). It becomes easy to rotate while pulling up to the position indicated by the solid line.

[0018]

[Action]

 According to the structure of the present invention, when the operating rod 16 is at the position (a) shown by the chain line in FIG. 3 or 7 at the most contracted position of the telescopic beam, the lock pin 8 is moved by the compression spring 15 into the inner cylinder. Since the engagement with the side pin hole 11 is maintained, there is no fear that the expansion beam will unintentionally expand during traveling of a mobile crane or the like. From this state, by pulling up the operating rod 16 while rotating it counterclockwise in the drawing, the compression spring 15 is compressed and the engaging portion 18 of the operating rod is moved as shown by the solid line in FIG. 4 or 7. When the lock pin 8 is brought into abutting engagement with the receiving plate 20 on the inner cylinder 3 side, the lock pin 8 is held in a disengaged state from the inner cylinder side pin hole 11.

Therefore, for example, as shown in FIG. 5, if the inner cylinder 3 is pulled out from the outer cylinder 2 and the receiving plate 20 on the inner cylinder side is disengaged from the engaging portion 18 of the operating rod 16, the compression spring 15 is slightly expanded. However, since the engaging portion 18 abuts and engages with the receiving plate 19 on the outer cylinder side to hold the lock pin 8 also in the disengaged state from the inner cylinder side pin hole 11, the telescopic beam is at the most extended position or The lock pin 8 can be freely extended to the intermediate extension position, and accordingly, the lock pin 8 is rotated by rotating the operating rod 16 at that position in a clockwise direction so that the engaging portion 18 thereof is disengaged from the outer cylinder side receiving plate 19. The telescopic beam can be locked to its extended position by engaging with the corresponding inner cylinder side pin hole 10 or 14.

When traveling with the telescopic beam in the extended position contracted most, the engaging portion 18 of the operating rod is engaged with the receiving plate 19 on the outer cylinder side as in FIG. When the inner cylinder 3 is pushed into the outer cylinder 2 after being pulled out from the pin hole on the side, the tip of the receiving plate 20 on the inner cylinder side presses the intermediate portion or the engaging portion 18 of the operating rod as shown in FIG. Then, the engagement of the engaging portion with respect to the receiving plate 19 on the outer cylinder side is released, so that the lock pin 8 is automatically fitted into the pin hole 11 on the inner cylinder side by the elastic force of the compression spring 15, and the telescopic beam is extended. Lock to the most contracted position.

[0021]

[Effect of the device]

 The present invention has the following effects.

According to the structure of claim 1, the posture of the operating rod in the locked state of the inner cylinder with respect to the outer casing and the attitude of the operating rod in the non-locked state are always constant, and the operating rod is Since both postures can be clearly discriminated, there is no risk of erroneous operation, and it is always safe to automatically lock the inner cylinder when the extended telescopic beam is contracted the most.

According to the structure of claim 2, the end portion of the U-shaped operating rod on the lock pin side is bent into a V shape in the rotation surface of the operating rod, and the beam-shaped engaging portion is provided in this. Since it is provided, the receiving plate on the outer cylinder side and the receiving plate on the inner cylinder side are affected by the assembly error of each outrigger part, the difference of the receiving plate width, and the uneven wear of the sliding part between the inner and outer cylinders. Even if a relative lateral displacement occurs between the receiving plates, the operation of rotating the U-shaped operating rod while pulling it to engage the beam-shaped engaging portion with the receiving plate is a relative operation between the receiving plates. There is no fear of being disturbed by the displacement.

According to the third aspect of the present invention, the guide plate for restricting the rotating surface of the U-shaped operating rod surrounds the rod portion of the lock pin in cooperation with the outer cylinder side receiving plate and the cantilever support portion thereof. Since the rod also functions as a protection frame, there is no risk that the rod portion will bend due to the collision of foreign matter, and when the beam-shaped engaging portion of the U-shaped operating rod is engaged with the receiving plate, Since the surface of the plate functions as a guide for the inner edge of the beam-shaped engaging portion, the operation of the U-shaped operating rod becomes easy.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view of an embodiment of the present invention at the most extended position of a telescopic beam.

FIG. 2 is a plan view of a main part of FIG.

FIG. 3 is a detailed view of a main part of FIG. 1 at a most contracted position of a telescopic beam.

FIG. 4 is a detailed view of the inner cylinder in FIG. 3 when the lock is released.

FIG. 5 is a detailed view of a main part when the telescopic beam starts to be extended from the most contracted position.

FIG. 6 is a detailed view of a main part when the telescopic beam is contracted most from the extended state.

FIG. 7 is a detailed view of an essential part of another embodiment of the present invention corresponding to FIG.

8 is a cross-sectional view taken along line YY of FIG.

FIG. 9 is a plan view of a conventional outrigger.

10 is a cross-sectional view taken along line XX of FIG.

[Explanation of symbols]

 1 Vehicle Body 2 Outer Cylinder 3 Inner Cylinder 4 Jack 8 Lock Pin 9 Outer Cylinder Side Pin Hole 10 Inner Cylinder Side Pin Hole 11 Inner Cylinder Side Pin Hole 15 Compression Spring 16 U-Shaped Operation Rod 18 Beam-Shaped Engagement Part 19 Outer cylinder side receiving plate 20 Inner cylinder side receiving plate 25 Guide plate

Claims (3)

[Scope of utility model registration request] 1. A vertical jack is fixed to the tip of the inner cylinder of a telescopic beam, which is formed by inserting an inner cylinder in a range of telescopically, into an outer cylinder laterally mounted on a vehicle body, and at least at the maximum extension position of the telescopic beam. At the most contracted position, a pin hole is formed in the inner cylinder that matches one pin hole provided at the tip of the outer cylinder, and a lock pin that is always fitted and biased in the inner cylinder side pin hole is provided. In an outrigger locking device attached to an outer cylinder side pin hole, an operating rod that rotates in a plane including the axes of all the pin holes of the inner and outer cylinders is pivotally attached to the outer end of the lock pin to attach the lock pin. In order to keep the pin out of the inner cylinder side, a receiving plate, which is provided in the middle of the operating rod and is engageable by an engaging portion, is provided at the tips of the inner cylinder and the outer cylinder. The cantilever is supported in parallel and the operating rod is engaged on the receiving plate on the inner cylinder side at the most contracted position of the telescopic beam. The inner cylinder side support plate is arranged outside the outer cylinder side support plate so that the parts can be engaged and disengaged, and when the telescopic beam in the expanded state is contracted to the maximum, the outer cylinder is supported by the tip of the inner cylinder side support plate. An automatic locking device for an outrigger characterized in that an engaging portion or an intermediate portion of an operating rod engaged with a side support plate is pushed out. 2. The locking pin side end of the U-shaped operating rod is
The U-shaped operating rod is bent into a V-shape within a rotation surface, and a portion of the V-shaped bent portion excluding a connecting side to the lock pin is a beam-shaped engaging portion. An automatic locking device for an outrigger according to claim 1. 3. As a means for aligning the turning surface of the U-shaped operating rod with a plane including the axis lines of all the pin holes of the inner and outer cylinders, a cantilevered support member is provided at each end of the outer cylinder and the inner cylinder. The width of the plate is set to a certain size so that it can be fitted into the U-shaped operating rod provided with a beam-shaped engaging portion in the middle, and the outer cylinder base end of the receiving plate cantilevered at the tip of the outer cylinder. A guide plate having the same width as the receiving plate is continuously provided between the side end and the outer cylinder surface corresponding to the side end so that the receiving plate between the axis of the lock pin and the surface of the guide plate is provided. 2. The automatic locking device for an outrigger according to claim 1, wherein a distance in a direction parallel to the lock pin is set to be smaller than a turning radius of an inner edge of the beam-shaped engaging portion with respect to the lock pin.