JPS62157192A - Changeover device for pawl fitting for plugging in drawgear - 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] [Field of Industrial Application] This invention relates to a method for preventing reverse rotation in a traction device used when towing a lifeline main rope at a construction site or when tightening ropes for securing loads during truck transportation. This invention relates to a switching device for a claw metal fitting.

[Prior art]

Conventionally, as a traction device, as disclosed in Japanese Utility Model Publication No. 43-25242, a rotary device comprising a load sheave around which a traction chain is wound, a ratchet wheel, a support shaft, and a rotary tool engagement shaft is used. The body is rotatably supported by a frame,
The intermediate portion of a pawl fitting having a pawl piece that is engaged with the ratchet wheel after being pressed down by an engagement spring is pivoted to the frame, and one end of the pawl fitting is provided with a pawl piece that engages with the frame. There is known a structure in which a lever for holding the pawl engagement position is pivotally mounted and is provided with a locking portion.

[Problem that the invention seeks to solve]

However, in the case of the above-mentioned conventional traction device, since it is not equipped with a claw metal fitting removal position holding device that holds the claw metal fitting in a state where it is separated from the claw shape, when adjusting the length of the towing side of the towing chain, It is necessary to push the other end of the claw metal fitting with one hand and keep the claw metal detached from the claw shape while pulling the traction chain with the other hand to idle the load sheave. There is a problem in that the operation when adjusting the length of the traction side of the chain is complicated.

[Purpose and structure of the invention]

The object of the present invention is to provide a switching device for a claw fitting for preventing reverse rotation in a traction device, which can advantageously solve the above-mentioned problems, and the gist of the present invention is to:
A rotating body 5, which includes a load sheave 2 around which a traction chain 1 is wound, a claw type 6 for preventing reverse rotation, and a rotary tool engagement shaft 4, is rotatably supported by a frame O, and is pressed against an engagement spring 7. a claw piece 8 that is engaged with the claw mold 6 and the claw piece 8
The middle part of the claw piece 8 in the claw metal fitting 10 for preventing reverse rotation is provided with the presser plate 9 connected to the base end of the rotating body 5.
The operating shaft 12, which is pivotally connected to the frame 6 by a support shaft 11 for a claw metal fitting parallel to the axis of the holder and is rotatably supported by the frame 6, has an operating shaft 12 on one side of the holding plate 9 in the longitudinal direction of the operating shaft. Cam member 13 for holding the engagement position of the claw fitting to be engaged
and a claw metal detachment position cam member 14 to be engaged with the other side of the operating shaft in the longitudinal direction of the holding plate 9 are provided at different phases. [Embodiment] Next, this invention will be explained in detail with reference to the illustrated example.0 Figures 1 to 10 show an embodiment of this invention, in which a chain is fitted around the periphery. A support shaft equipped with a large number of inclined engagement teeth 15 provided at a constant pitch on both sides of a load sheave 2 provided with a matching recess, and an arcuate bearing surface 16 located at the top of the engagement teeth 15. Dual-purpose reverse rotation prevention pawl molds 6 are integrally connected, and a rotary tool engaging shaft 4 having a square shaft portion 17 for fitting a rotary tool is integrally connected to the side of one pawl mold 3. The rotating body 5 is constructed using a frame structure unit (18, 19), which is formed by pressing a steel plate. A groove-shaped chain located at the upper part is connected to the ID 21, the chain stripper 22 located at the lower part of the opening 20, the semi-cylindrical part 23 located on both sides of the lower part, and the end of the semi-cylindrical part 26. end plate 24, upper storage recess 25, and lower end flange 26.
and side flanges 27 and an upper end flank 28 of double-fold construction, each frame component unit) 18.1
The frame 6 is constructed by overlapping the lower end 7 runs 26 and side flanges 27 of the frame 9 and joining them with rivets 29.

The claw molds 3 on both sides of the rotary body 5 are rotatably fitted into the cylindrical portion constituted by the semi-cylindrical portion 26 of the pair of frame constituent units 18 and 19, and the rotary tool engagement shaft 4 a pair of claw pieces 8 that protrude to the outside of the frame 6 and engage with the engaging teeth 15 of each of the claw shapes 6;
The claw metal fitting 10 for preventing reverse rotation, which consists of a presser plate 9 that connects the base end of each claw piece 8 and a reinforcing connecting plate 60 that connects the side edge of each claw piece 8, is made of a steel plate that is press-formed. It consists of
Both ends of a support shaft 11 for a claw metal fitting made of a round steel rod into which the middle part of each claw piece 8 of the claw metal fitting 10 is rotatably fitted are as follows:
It is rotatably fitted into a circular hole constituted by a semicircular hole provided in each of the frame constituent units 18 and 19, and furthermore, the end face of the support shaft 11 for the claw metal fitting is connected to the side part 7 run hole 2.
7, this chamber functions as a stopper that limits movement of the support shaft 11 in the longitudinal direction.

The engagement spring 7 fitted to the support shaft 11 is engaged with the frame 6 and the claw metal fitting 10, and the engagement spring 7 engages the claw metal fitting 10 so as to engage the claw piece 8 with the engagement tooth 15. Rotate. A square shaft portion 32 is attached to one end of the operation shaft 12 extending in a direction perpendicular to the support shaft 11 at the upper part of the claw metal fitting 10.
and a small diameter shaft portion 33 are integrally arranged, and the small diameter shaft portion 6
3 is rotatably fitted into a small-diameter hole provided in the negative frame component unit 18, and the other end of the operating shaft 12 has a large-diameter shaft portion 34 and a square shaft portion for fitting a rotary tool. 65 are sequentially and integrally connected, the large-diameter shaft portion 34 is rotatably fitted into a large-diameter hole provided in the other frame component unit 19, and the square shaft portion 35 is connected to the outside from the frame component unit 19. It stands out.

Inside the frame 6, a cam member 13 for holding the engagement position of the pawl fitting and a cam member 14 for holding the disengagement position of the pawl fitting are integrally provided on both sides of the operating shaft 12 in the longitudinal direction.
．． 14 are arranged in phases 180° different from each other, and the cam member 13 for holding the engagement position of the claw metal fitting 10 is arranged so as to face one side in the longitudinal direction of the operating axis of the presser plate 9 of the claw metal fitting 10. The detachment position holding cam member 14 is arranged to face the other side of the presser plate 9 in the longitudinal direction of the operating shaft.

A shaft presser spring 38 including a spring lowering stopper 66 and a pair of shaft presser arms 67 is arranged at the upper part of the frame 6, and the spring lowering stopper 36 contacts or approaches the upper part of the square shaft part 62. Furthermore, the tip of each shaft holding arm 67 is arranged so as to engage with both sides of the lower part of the square shaft part 62, and each time the operating shaft 12 is rotated by 90 degrees, The operating shaft 12 is held so as not to rotate unnecessarily by the elastic pressing force of the shaft holding arm 37 against the lower side slopes of the portion 62.

An engaging fitting 39 consisting of a hook is connected to one end of the traction chain 1 wound around the load sheave 2, and a stopper 40 for preventing slippage is attached to the other end of the chain 1. A pair of frame configuration units 1-18.
One end of a connecting chain 41 is interposed between the upper end 7 lans 28 at 19, and a connecting bolt 42 is inserted between the one end of the chain 41 and each upper end flange 28, and the other end of the connecting chain 41 An engaging metal fitting 43 made of a hook is attached to the portion. In addition, in order to enable the rotating body 5 and the operating shaft 12 to be rotated by a common rotating tool such as a screw, a box spanner, etc., the square shaft portion 17 of the rotating tool engagement shaft 4 and the operating shaft The square shaft portion 35 of the shaft 12 has the same cross-sectional shape and the same cross-sectional dimensions.

When using the towing device of the above embodiment to tow a lifeline main rope or a rope for tying up cargo, please refer to Figs. 3 and 4.
As shown in the figure, each cam member 13° 14 is separated from the presser plate 9 of the pawl fitting 10, and the engagement spring 7 engages each pawl piece 8 of the pawl fitting 10 with each pawl wheel 6 on the rotating body 5. the teeth 15, and then move a suitable general-purpose rotary tool (not shown) to the square shaft portion 1 of the rotating body 5.
7, and the rotation tool rotates the rotating body 5 in the direction of arrow A in FIG. In this case, even if the rotational force in the towing direction is released from the square shaft portion 17 during towing or after the end of towing, the rotating body 5 Reversal, that is, rotation in the loosening direction is prevented.

Also, by engaging the rotating tool with the square shaft portion 35 of the operating shaft 12 and rotating the operating shaft 12 by 90 degrees in the direction of arrow B from the state shown in FIGS. 3 and 4, As shown in FIG. 9, the pawl fitting position holding cam member 16 can be brought into contact with or close to the front upper surface of the presser plate 9 of the pawl fitting 10 to lock the pawl fitting in the engaged state.

In addition, the operating shaft 12 is moved from the state shown in FIGS. 6 and 4 to 9.
00 in the direction of arrow C, the pawl fitting 10 is rotated to the disengaging position via the pawl fitting detachment position holding cam member 14 against the force of the engagement spring 7, as shown in FIG. As such, the claw metal fitting can be locked in the detached state. In this state, by pulling the traction chain 1 by hand, the rotating body 5 can be rotated in any direction, and the length of the traction side of the traction chain 1 can be adjusted.

As in the above embodiment, a pair of frame constituent units) 18 and 19 formed by pressing a steel plate are connected to the rivet 2.
9 or the like to form the frame 6, the frame can be made lighter and manufactured at lower cost than a cast iron frame.

In the case of the embodiment described above, the load acting on the frame B can be evenly distributed to the left and right and the balance can be maintained, so that the frame 6 can be made thinner and lighter.

In addition, since the frame B has various functions such as a protective cover, RT receiver, chain guide, and chain stripper, the structure can be simplified and the number of parts can be reduced. Therefore, the traction device can be installed at a low cost. It can be manufactured.

Further, in the case of the above embodiment, the load sheave 2 is equipped with a large number of engaging teeth 15 provided at a constant pitch on the side and an arcuate bearing surface 16 located at the top of each engaging tooth. Since the rotating body 5 is constructed by integrally providing the ratchet wheel 3 and the rotary tool engaging shaft 17, the ratchet wheel, support shaft, and rotary tool engaging shaft are arranged in series on the side of the load sheave. The length of the rotating body 5 can be shortened compared to the case where the rotating body is configured by arranging the rotating body 5. Therefore, the main body of the traction device including the rotating body 5 can be made smaller and lighter, and the traction device can be made smaller and lighter. In addition to improving handleability, the traction device can be manufactured at low cost.

FIG. 11 shows an embodiment of the pond of this invention,
The operating shaft 12 is disposed above and parallel to the support shaft 11 for the claw metal fitting, but the other configurations are the same as in the previous embodiment.

When carrying out this invention, a ratchet wheel 6 that also serves as a support shaft may be provided on one side of the load sheave 2, and a support shaft with a circular cross section that does not have engaging teeth may be provided on the other side of the load sheave 2. ,
In this case, a claw metal fitting having one claw piece is used. Further, the engaging fitting 4 may be attached to the upper part of the frame B via a connecting fitting such as a universal joint.

As the engaging fittings 39 and 43, any other engaging fitting may be used instead of the hook, and the connecting chain 41 and the engaging fitting 43 may be omitted, and the upper end of the frame An engaging device made of a wire rope having an annular portion may be attached. Furthermore, a handle is fixed to the outer end of the operating shaft 12 without providing the square shaft portion 35 for fitting a rotating tool, and the operating shaft 12 is rotated by grasping the handle with a hand. Good too.

〔Effect of the invention〕

According to this invention, the load sheave 2 and the claw type 3 for preventing reverse rotation.
A rotating body 5 having a rotary tool engagement shaft 4 is rotatably supported by a frame B, and a claw piece 8 which is pressed by an engagement spring 7 and engaged with the ratchet wheel 3 and its claw piece. The middle part of the pawl piece 8 in the pawl piece 10 for preventing reverse rotation, which is provided with a presser plate 9 connected to the base end of the pawl piece 8, is attached to the frame by a pawl piece support shaft 11 parallel to the axis of the rotating body 5. It is pivoted to B,
Operation shaft 12 rotatably supported by frame 6
In this case, a cam member 13 for retaining the claw fitting engagement position is to be engaged with one side in the longitudinal direction of the operating shaft on the presser plate 9, and a cam member 13 for holding the claw fitting engagement position is to be engaged with the other side in the longitudinal direction of the operating shaft on the presser plate 9. Since the cam member 14 for the claw metal removal position is provided in a different phase, the operation shaft 12 causes the claw metal fitting 10 to be moved by the force of the engagement spring 7 via the cam member 14 for holding the claw metal removal position. By rotating the claw metal fitting 10 against the ratchet wheel 6, the pawl fitting 10 can be maintained in a state separated from the ratchet wheel 6. Therefore, when adjusting the length of the towing side of the towing chain 1, the pawl fitting 10 can be held by hand from the ratchet wheel 6. Since there is no need to keep holding the towing chain 1 in a detached state, the length of the towing chain 1 for towing can be easily adjusted, and the cam member 13 for holding the pawl engagement position can be rotated by the operating shaft 12. By arranging the cam member 13 in a state where it can engage with the presser plate 9 of the claw metal fitting 10, it is possible to lock the claw metal fitting in the engaged state.
．． 14 to separate it from the holding plate 9 of the claw metal fitting 10, the rotating body 5 can be rotated and pulled. Therefore, by simply rotating the operation shaft 12, the claw metal fitting 10 can be moved Effects such as being able to switch between a detached lock state, a pawl engagement lock state, and a towable state can be obtained.

[Brief explanation of drawings]

1 to 10 show an embodiment of the present invention, in which FIG. 1 is a front view of the traction device, and FIG. 2 is a side view thereof. Fig. 3 is a vertical front view of the traction device main body when the cam member is rotated to the neutral position, Fig. 4 is a longitudinal side view thereof, and Fig. 5 is the shaft pressing spring, the square shaft part of the operating shaft, and the frame. FIG. 6 is a partially vertical front view of the rotating body. Fig. 7 is a longitudinal sectional front view showing the main body of the traction device when the claw metal fittings are locked in the engaged state;
FIG. 9 is a vertical side view of the central part of the load sheave part and other parts in FIG. 7; FIG.
FIG. 0 is a longitudinal sectional side view showing the main body of the traction device when the claw metal fitting is locked in the detached state. FIG. 11 is a longitudinal sectional side view showing a switching device for a claw fitting for preventing reverse rotation in a traction device according to another embodiment of the present invention. In the figure, 1 is a traction chain, 2 is a load sheave,
3 is a claw wheel for preventing reverse rotation, 4 is a rotary tool engagement shaft, 5 is a rotating body, 6 is a frame, 7 is an engagement spring, 8 is a claw piece, 9 is a holding plate, 10 is a claw metal fitting for preventing reverse rotation, 11 Support shaft for claw metal fittings, 12
13 is an operating shaft, 13 is a cam member for holding the engagement position of the claw metal fitting, 14 is
15 is an engagement tooth, 16 is an arc-shaped bearing surface, 17 is a square shaft portion for fitting a rotary tool, 18 and 19 are frame constituent units, 21 is a chain guide,
22 is a chain stripper, 23 is a semi-cylindrical part, 24 is an end plate, 26 is a lower end 7 run, 27 is a side flange, 28
is the upper end 7 runno, 29 is the rivet, 32 is the square shaft part, 6
5 is a square shaft part for fitting a rotary tool, 66 is a spring stopper part,
37 is a shaft presser arm, 38 is a shaft presser spring, 39 and 4
Ro is an engaging metal fitting. Figure 5 Figure 6 Figure 7 Figure 9

Claims (1)

[Claims] A rotating body 5 comprising a load sheave 2 around which a traction chain 1 is wound, a ratchet wheel 3 for preventing reverse rotation, and a rotary tool engagement shaft 4 is rotatably supported by a frame 6 and is pressed against an engagement spring 7. a claw piece 8 that is engaged with the ratchet wheel 3 and the claw piece 8
The middle part of the claw piece 8 in the claw metal fitting 10 for preventing reverse rotation is provided with the presser plate 9 connected to the base end of the rotating body 5.
The operating shaft 12, which is pivotally connected to the frame 6 by a support shaft 11 for a claw metal fitting parallel to the axis of the holder and is rotatably supported by the frame 6, has an operating shaft 12 on one side of the holding plate 9 in the longitudinal direction of the operating shaft. Cam member 13 for holding the engagement position of the claw fitting to be engaged
and a claw metal detachment position cam member 14 to be engaged with the other side of the operating shaft in the longitudinal direction of the holding plate 9 are provided at different phases. switching device.