JPS5935500Y2 - Automatic pin operation indicator for crane telescopic jib - Google Patents

Description

[Detailed description of the invention] This invention displays the operating state of an automatic pin that is inserted into a hole drilled in one member to lock the sliding movement of a crane device that has a jib that is telescopic and sliding. This relates to a device for

Conventionally, an automatic pin device for a crane generally has a configuration as shown in Fig. 1, and in a structure where a steel plate 3 slides against a steel plate 2 with a through hole 1, it is automatically moved to a position opposite to the through hole 1. A pin device 4 is provided.

A hollow cylindrical main body case 5 is fixed to the steel plate 3, and a locking pin 6 is slidably fitted into the main body case 5, and a spring 7 is attached to the main body case 5.
is biased in the direction of arrow A.

When the steel plate 3 slides against the steel plate 2 and the locking pin 6 faces the through hole 1, the automatic locking pin 6 is prevented from sliding and protrudes in the direction of arrow A by the urging force of the spring 7, and the locking pin 6 is prevented from sliding against the through hole 1. Since the steel plate 2 and the steel plate 3 are inserted into the interior, sliding movement between the steel plate 2 and the steel plate 3 is automatically locked.

A cam-shaped flange 8 and a ring 9 are fixed to the locking pin 6, and when a fork (not shown) collides with the cam-shaped flange 8, the locking pin 6 is biased by the urging force of the spring 7. The steel plate 2 is removed and slid in the direction of arrow B against the
It is designed to release the sliding lock between and 3.

It is also possible to engage the ring 9 with a /'% handle (not shown) and manually remove and slide it in the direction of arrow B.

In order to know whether or not the tip of the locking pin 6 has been reliably inserted into the through hole 1, it seems to be a good idea to visually check whether there is a gap t between the main body housing 5 and the flange 8, but this Since the location where the automatic pin device is installed is usually several tens of meters away from the driver's seat, it is difficult to confirm a single dimension of several millimeters with the naked eye.

In order to eliminate such problems and allow the driver to easily know the insertion state of the locking pin 6, a sliding rod 10 that is pressed against the flange 8 and a display plate 11 that rotates in conjunction with the sliding rod 10 are provided. The display board 11 is provided with a locking pin 6.
When the locking pin 6 moves upward in the direction of arrow A, it becomes the C position (vertical position) shown by the solid line, and when the locking pin 6 moves downward in the direction of arrow B, the display plate 11 rotates in the direction of the arrow by the biasing force of the spring 12, as shown by the chain line. It is now in the C position (horizontal attitude) shown.

The details of the structure are as shown in FIG. 2. The display plate 11 is fixed to a rotating shaft 13 and is biased by a spring 12 with rotational force in the direction of the arrow.

An interlocking arm 14 is fixed to this rotating shaft, and a long hole 15 formed in the interlocking arm 14 is loosely engaged with an interlocking pin 16 integrally formed with the sliding rod 1o.

If no external force is applied to the sliding rod 10 and the downward movement in the direction of arrow F is not prevented, the sliding rod 10 is moved downward in the direction of arrow F by the interlocking arm 14 and the interlocking arm 14, which is integrally formed therewith. The rotating shaft 13 and the display board 11 rotate in the direction of the arrow, and the display board 11 assumes the C position (horizontal attitude).

In addition, the flange 8 moves upward in the direction of the arrow H as the locking pin 6 is inserted upwardly, and collides with the sliding rod 1o, causing the flange 8 to move upwardly in the direction of the arrow H.
When pushed upward in the direction, the interlocking pin 16 tilts the interlocking arm 14 in the direction of the arrow, so the rotating shaft 13 and the display plate 11, which are integrally constructed with the interlocking arm 14, rotate in the direction of the arrow, and the display plate 11 tilts in the direction of the arrow. It will be in C position (vertical posture).

In an automatic pin device having the above-described structural function, when the through hole 1 does not completely coaxially oppose the locking pin 6 as shown in FIG. The tip of the hole 1 interferes with the periphery of the through hole 1, preventing complete penetration.

In such a state, the sliding rod 1o cannot be moved up completely, so the rotation of the display board 11 in the direction of the arrow is also at position C (
It stops at the M position without performing all strokes up to the vertical position.

When the driver views this from a distance in the direction of arrow N from the driver's seat, the display board 11 does not look like a perfect circle P, but instead looks like an ellipse Q, because the length of the long axis and short axis of the ellipse Q are approximately equal. It is difficult to visually distinguish this from the circle P, and it is easy to misunderstand that it is a circle P.

If the driver misunderstands the incompletely inserted state of the automatic locking pin 6 as complete penetration, there is a great risk that the crane jib will be damaged and a disaster may occur.

The present invention was developed in view of the situation of oblique operation, and the display plate 11 maintains a horizontal position until the locking pin 6 is completely inserted into the through hole 1, and momentarily rotates 90 degrees when the locking pin 6 is completely inserted. The object of the present invention is to provide an operation display device that does not cause the driver to misunderstand incomplete insertion of the locking pin 6 as complete insertion.

Next, the structure will be explained based on FIG. 5 showing an embodiment of the present invention. The rotating shaft 13 to which the display plate 11 is fixed is biased with rotational force in the direction of the arrow R by the spring 17, and the ratchet teeth 18
is fixed.

Then, a ratchet pawl 21 formed integrally with a tilting rod 20 that is pivotally supported by a shaft 19 so as to be tiltable with respect to the main body housing 5 engages with the ratchet tooth 18, thereby locking the rotation in the direction of arrow R. It is supposed to be done.

Reference numeral 22 denotes a spring 22 for applying a tilting force to the tilting rod 20 in the direction of arrow S to bring the ratchet pawl 21 into contact with the ratchet teeth 18.

An interlocking arm 23 is fixed to the rotation shaft 13, and an interlocking shaft 24 for interlocking is integrally formed at the tip of the interlocking arm 23.

Sliding rod 2 structured to be pushed and pushed by the flange 8
A hollow frame 26 is integrally formed in the center of the interlocking shaft 2.
It is loosely engaged with 4.

The sliding rod 25 is biased in the downward movement direction by a spring 27, and is designed and manufactured so that this biasing force is much weaker than the biasing force of the spring 7 and much stronger than the biasing force of the spring 17. has been done.

A roller 28 is pivotally supported at the tip of the tilting rod 20, so that when the flange 8 moves upward, it collides with a cam 29 attached to the bracket 8, causing the tilting rod 20 to tilt in the direction of arrow T. It has become.

A threaded rod 30 is cut into the cam 29 and is screwed into the flange 8 and locked by a locking nut 31.

The device of the present invention is constructed as described above, and as shown in FIG. 6, when the flange 8 moves downward and separates from the sliding rod 25, the sliding rod 25 is urged by the spring 27 and moves downward. The interlocking arm 23, which is engaged through the hollow frame 26 and the interlocking shaft 24, is swung in the direction of arrow U, and the display board 11 assumes a horizontal position.

When the flange 8 moves upward and collides with the sliding rod 25, as shown in FIG. 7, the hollow frame 26 separates from the interlocking shaft 24 and no longer exerts any particular force.

Then, the rotation shaft 13 and the display plate 11 fixed thereto try to rotate in the direction of arrow R due to the urging force of the spring 17, but since the ratchet teeth 18 are locked by the ratchet claws 21, the rotation in the direction of arrow R is prevented. Blocked, display board 11
maintains a horizontal position.

Even if the flange 8 rises as shown in FIG. 8, the cam 29 does not completely tilt the tilting rod 20 in the direction of the arrow T while the gap t' remains between it and the main body housing 5. The ratchet pawl 21 does not release the locking of the ratchet teeth 18, and the display plate 1
1 maintains a horizontal posture.

When the flange 8 further moves upward in the direction of arrow H and the locking pin (6 in FIG. 1) is inserted into the through hole (1 in FIG. 1), the 9th
As shown in the figure, when the flange 8 comes into close contact with the main housing 5 and the gap t'' becomes zero, the cam 29 tilts the tilting rod 20 with the roller 28 engaged in the direction of the arrow T, and moves the ratchet pawl 21 away from the ratchet teeth 18. Since the locking is released by separating them, the rotation shaft 13 and the display board 11 are rotated in the direction of arrow R, and the display board 11 assumes a vertical posture.

In addition, screw the screw rod 30 onto the flange 8, and make a gap of 1//
When the value becomes exactly zero, the ratchet pawl 21 moves to the ratchet tooth 1.
It shall be adjusted so that it is separated from 8.

When the present invention is applied, the operation described in detail above causes the display plate 11 to remain closed until the locking pin 6 is completely inserted into the through hole 1.
maintains a horizontal position, and when the insertion is completed, the display plate 11 instantly changes to a vertical position. Therefore, the driver does not need special skill and can reliably sense the operating state of the locking pin 6. Done,
It can demonstrate excellent practical performance as there is no risk of misperception of operation due to illusion.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an automatic pin device for a crane jib that has been commonly used in the past, Figs. 2 and 3 are explanatory diagrams of the structure and operation of an automatic pin operation display device that has been commonly used in the past, and Fig. 4 is an explanatory diagram of an automatic pin operation display device that has been commonly used in the past. A diagram for explaining defects in the prior art device, FIG. 5 is a configuration explanatory diagram of an embodiment of the present invention,
FIG. 6 to FIG. 9 are explanatory diagrams of the same operation. 1...Through hole, 2...Steel plate, 3...
...Steel plate, 4...Automatic pin device, 5...
・Main body casing, 6... Locking pin, 7... Spring, 8... Cam-shaped flange, 9...
...Ring, 10...Sliding rod, 11...Display plate, 12...Spring, 13...
Rotation shaft, 14... Interlocking arm, 15... Elongated hole, 16... Interlocking pin, 17... Spring, 18... Ratchet tooth, 19...
...Shaft, 20...Tilt rod, 21...Ratchet pawl, 22...Spring, 23...
...Interlocking arm, 24...Interlocking axis, 25...
...Sliding rod, 26...Hollow frame, 27...
・Spring, 28...Roller, 29...
...Cam, 30...screw rod, 31...locking nut.

Claims (1)

[Scope of Claim for Utility Model Registration] The locking pin 6 attached to the outer jib is inserted into the through hole 1 provided in the inner jib of the crane telescopic jib fitted in multiple stages to restrain sliding between the jibs. This is an operation display device for the automatic pin device 4, in which a display plate 11 is fixed, and the display plate is rotationally biased by a spring 17 in the direction of displaying the display position, and when the locking pin is removed, the display plate is placed in the non-display position. The rotating shaft 13 is rotated to return to its original position, and has a ratchet pawl 21 that engages with ratchet teeth 18 provided on the rotating wheel in the non-display position of the rotating shaft, and this engaged state is maintained under pressure by a spring 22. A crane telescopic jib characterized in that the tilting rod 20 is tilted in the direction of releasing the locked state by a cam 29 that collides with the locking pin when it is fully inserted. Automatic pin activation indicator.