CN213112311U - Reversing device of lever block - Google Patents

Abstract

The utility model discloses a hand hoist's switching-over device belongs to hand hoist switching-over device technical field. The wrench comprises a connecting shaft supported on a wrench shell, a reversing pawl positioned in the wrench shell and a pulling block riveted on the connecting shaft, wherein a spring seat positioned below the reversing pawl is arranged in the wrench shell, the spring seat is separately provided with a push rod and a spring, the push rod is provided with a rod body part and a top head formed at the top end of the rod body part, the spring is freely sleeved on the rod body part, the bottom end of the spring is abutted against the cavity bottom of the spring seat, while the top end of the spring is abutted against the rod body part, the bottom of the reversing pawl is concavely provided with a stop pit, the reversing pawl is provided with an internal spline, the connecting shaft is provided with an external; when the shifting block is pulled, the stop pit of the reversing pawl can be positioned with the top. After the technical scheme is adopted, when the reversing device is assembled in the process of pulling the shifting block, the stop concave pit can be easily positioned with the top head, and the reversing pawl is ensured to be accurately positioned in the neutral position.

Description

Reversing device of lever block

[ technical field ] A method for producing a semiconductor device

The utility model relates to a reversing arrangement of lever block belongs to lever block reversing arrangement technical field.

[ background of the invention ]

In the lever block, the reversing device with the existing structure mainly comprises a pulling block, a connecting shaft, a reversing pawl and an elastic supporting component. The connecting shaft is assembled in a shaft hole formed in the handle shell, a shaft section of the connecting shaft, which is positioned in the handle shell, is provided with a hexagonal head, the reversing pawl is provided with a hexagonal hole, the reversing pawl is sleeved at the hexagonal head of the connecting shaft through the hexagonal hole, and the pulling block is riveted at the end, which is positioned outside the handle shell, of the connecting shaft; the elastic supporting part consists of a spring seat, an ejector rod and a pressure spring, the spring seat is welded on the inner wall of the handle shell, and the pressure spring is sleeved on the ejector rod and then is placed in the spring seat together.

Careful analysis of the above structure has revealed the following disadvantages:

when the reversing device is assembled on the lever block, the reversing pawl rotates by 60 degrees when the shifting block is shifted, sometimes the stopping concave pit of the reversing pawl is difficult to smoothly fall into the top head positioned at the top end of the ejector rod, and instead the top head slides over the stopping concave pit and falls into the position of the ascending gear concave pit or the position of the descending gear concave pit of the reversing pawl (the ascending gear concave pit and the descending gear concave pit are respectively adjacent to the stopping concave pit), sometimes the stopping concave pit and the ejector rod can be positioned into a neutral position by repeatedly adjusting for many times, and the assembling efficiency is influenced due to the difficulty in alignment.

[ Utility model ] content

The to-be-solved technical problem of the utility model is to provide a hand-operated block's switching-over device to the not enough of above-mentioned prior art existence.

Therefore, the utility model provides a technical scheme that above-mentioned technical problem adopted as follows:

the utility model provides a switching-over device of lever block, is including rotationally supporting the connecting axle on spanner housing, be located spanner housing and circumference fix the switching-over pawl on the connecting axle and rivet the shifting block on connecting axle outside it, is provided with the spring holder that is located switching-over pawl below in the spanner housing, ejector pin and spring have been installed respectively to the spring holder, and the ejector pin has the pole somatic part and forms the top on its top of the body of rod portion, and the spring is empty to be overlapped on the pole somatic part, and the bottom of spring is contradicted at the bottom of the chamber of spring holder, and the top of spring is supported and is touched the pole somatic part, and the switching-over pawl is concave in its: the reversing pawl is provided with an internal spline, the connecting shaft is provided with an external spline at the position where the connecting shaft is fixed with the reversing pawl in the circumferential direction, and the reversing pawl is connected with the connecting shaft through the internal spline and the external spline; when the shifting block is pulled, the stop pit of the reversing pawl can be positioned with the top.

For further precision adjustment of the neutral position of the reversing pawl, the internal spline has 36 key grooves, and the external spline has 36 key teeth.

The utility model has the advantages as follows:

abandon prior art switching-over pawl and offered interior hexagonal hole to and supporting processing hexagon head on the connecting axle, the substitute is: the reversing pawl is connected with the connecting shaft through the internal spline and the external spline, so that when the reversing device is assembled on the lever block, the stop pit of the reversing pawl can be easily positioned with the top when the shifting block is pulled, the reversing pawl is ensured to be accurately positioned at a neutral position, and the assembling efficiency of the reversing device is improved.

[ description of the drawings ]

The present invention will be described in further detail with reference to the accompanying drawings.

Fig. 1 is a structural view of the reversing device of the present invention assembled on a wrench body of a lever block;

FIG. 2 is a schematic view of the connecting shaft, the reversing pawl and the pulling block of the present invention;

FIG. 3 is a cross-sectional view of the connecting shaft and reversing pawl;

fig. 4 is a schematic view of a connecting shaft and a pulling block.

[ detailed description ] embodiments

Please refer to fig. 1 to 4, a reversing device of a lever block comprises a connecting shaft 1 rotatably supported on a wrench housing 7, a reversing pawl 2 located in the wrench housing 7 and circumferentially fixed on the connecting shaft 1, and a pulling block 3 riveted to an outer end of the connecting shaft 1, wherein a spring seat 4 located below the reversing pawl 2 is arranged in the wrench housing 7 (specifically, welded), the spring seat 4 is respectively provided with a spring 6 and a push rod 5, the push rod 5 has a rod body 50 and a top 51 formed at the top end of the rod body 50, the spring 6 is sleeved on the rod body 50, the bottom end of the spring 6 abuts against the cavity bottom of the spring seat 4, the top end of the spring 6 abuts against the rod body, the reversing pawl 2 is concavely provided with a stop pit 20 at the bottom thereof, and the improvement point lies in that: the reversing pawl 2 is provided with an internal spline 2a, the connecting shaft 1 is provided with an external spline 1a at the position where the connecting shaft and the reversing pawl 2 are circumferentially fixed, and the reversing pawl 2 is connected with the connecting shaft 1 through the internal spline and the external spline; when the shifting block 3 is pulled, the stop recess 20 of the reversing pawl 2 can be positioned with the plug 51.

The pull block 3 is riveted to the end of the connecting shaft 1 which projects beyond the wrench housing 7.

The internal spline and the external spline are both triangular splines.

An up-shift recess 21 and a down-shift recess 22 are formed in the lower portion of the reversing pawl 2 on one side and the other side of the stopper recess 20. When the lever block works and a heavy object needs to be lifted, the shifting block 3 is shifted in one direction to align and clamp the lifting gear pit 21 on the top head 51, and the lifting engaging pawl 23 is engaged with a reversing ratchet wheel (known parts are not shown); when it is desired to lower the weight, the block 3 is pulled in the other direction so that the lower notch 22 is aligned with the catch on the top 51, and the lowering engagement pawl 24 engages the reversing ratchet.

The internal spline 2a has 36 key grooves, and the external spline 1a has 36 key teeth.

When the shifting block 3 is shifted, the reversing pawl 2 only rotates 10 degrees, and neutral position alignment is easy to realize due to the small rotation angle of the reversing pawl 2.

The body 50 of the post 5 is T-shaped, and the body 50 and the head 51 are an integral part.

Claims (2)

1. The utility model provides a switching-over device of lever block, is including rotationally supporting the connecting axle on spanner housing, be located spanner housing and circumference fix the switching-over pawl on the connecting axle and rivet the shifting block on connecting axle outside it, is provided with the spring holder that is located switching-over pawl below in the spanner housing, ejector pin and spring have been installed respectively to the spring holder, and the ejector pin has the pole somatic part and forms the top on its top of the body of rod portion, and the spring free sleeve is on the pole somatic part, and the bottom of spring is contradicted at the bottom of the chamber of spring holder, and the top of spring is to touching the pole somatic part, and the switching-over pawl is equipped with the locking pit: the reversing pawl is provided with an internal spline, the connecting shaft is provided with an external spline at the position where the connecting shaft is fixed with the reversing pawl in the circumferential direction, and the reversing pawl is connected with the connecting shaft through the internal spline and the external spline; when the shifting block is pulled, the stop pit of the reversing pawl can be positioned with the top.

2. The device for reversing a lever block according to claim 1, wherein: the internal spline has 36 keyways, and the external spline has 36 key teeth.

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