JPH025673B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is directed 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 type is equipped with a load sheave around which a traction chain is wound, a ratchet wheel, a support shaft, and a rotary tool engagement shaft. The body is rotatably supported by a frame, and the middle part of a claw metal fitting provided with a claw piece that is pressed by an engagement spring and engaged with the ratchet wheel is pivotally connected to the frame, and one end of the claw metal fitting. There is known a structure in which a lever for holding the pawl engagement position is pivotally mounted, and the lever is provided with a locking portion for preventing rotation of the pawl that engages with the frame.

[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 pawl metal detachment position holding device that holds the pawl metal in a state where it is separated from the ratchet wheel, when adjusting the length of the traction side of the traction 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 ratchet wheel while pulling the traction chain with the other hand to make the load sheave spin idle. 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 problem. A rotary body 5, which includes a loaded load sheave 2, 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 by an engagement spring 7 to engage the ratchet wheel 3. The middle part of the claw piece 8 in the claw metal fitting 10 for preventing reverse rotation is provided with the claw piece 8 that is engaged with the rotating body 5 and the presser plate 9 that is connected to the base end of the claw piece 8. The operation shaft 12 is pivotally connected to the frame 6 by a support shaft 11 for a claw metal fitting parallel to the axis, and is rotatably supported by the frame 6. The cam member 13 for holding the engagement position of the claw fitting to be aligned with the cam member 14 for the detachment position of the claw fitting to be engaged with the other side in the longitudinal direction of the operating shaft of the presser plate 9 are provided in different phases. A switching device for a claw metal fitting for preventing reverse rotation in a traction device is provided.

〔Example〕

Next, the present invention will be explained in detail using illustrated examples.

Figures 1 to 10 show an embodiment of the present invention, in which a number of inclined engagement sheaves are provided at a constant pitch on both sides of a load sheave 2, which is provided with a recess for chain engagement around its periphery. tooth 15 and an arcuate bearing surface 16 located at the top of the tooth 15;
A rotating tool engagement shaft having a square shaft portion 17 for fitting a rotating tool is provided on the side of one of the rotating tool 3. 4 are integrally connected to form the rotating body 5, and the frame constituent units 18 and 19 formed by pressing a steel plate have a chain entry/exit opening 20 located at the center of the lower part, The opening 2
Groove-shaped chain guide 21 located at the top of 0
, a chain stripper 22 located at the lower part of the opening 20, a semi-cylindrical part 23 located on both sides of the lower part, a steel plate 24 connected to the end of the semi-cylindrical part 23, and an upper storage recess. 25, a lower end flange 26, a side flange 27, and an upper end flange 28 of double folded structure, and the lower end flange 26 of each frame component unit 18, 19
and the side flanges 27 are overlapped and connected by rivets 29, thereby forming the frame 6.

The ratchet wheels 3 on both sides of the rotary body 5 are rotatably fitted into cylindrical portions constituted by semi-cylindrical portions 23 of the pair of frame constituent units 18 and 19, and the rotary tool engagement shaft 4 is A pair of claw pieces 8 that protrude outside the frame 6 and engage with the engaging teeth 15 of each of the claw wheels 3, a presser plate 9 that connects the base end of each claw piece 8, and The claw metal fitting 10 for preventing reverse rotation, which is composed of a reinforcing connecting plate 30 that connects the side edges, is constructed by pressing a steel plate, and the middle part of each claw piece 8 in the claw metal fitting 10 is rotatable. Both ends of the mated round steel rod support shaft 11 are connected to each frame component unit 1.
The end face of the claw metal support shaft 11 is fitted into the circular hole formed by the semicircular holes provided in the side flange 27 so as to be rotatable. Opposed to the bottom part, this bottom part functions as a stopper for restricting the 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 and a small-diameter shaft portion 33 are integrally connected to one end of the operating shaft 12 extending in a direction perpendicular to the support shaft 11 at the upper part of the claw metal fitting 10, and the small-diameter shaft portion 33 It is rotatably fitted into a small-diameter hole provided in the frame component unit 18, and a large-diameter shaft portion 34 and a square shaft portion 35 for fitting a rotary tool are sequentially integrated into the other end of the operating shaft 12. 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 3
5 protrudes outward from the frame component unit 19.

In 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, and the cam members 13 and 14 differ from each other by 180 degrees. The cam member 13 for holding the engagement position of the claw metal fitting 10 is disposed in a phase opposite to one side of the holding plate 9 of the claw metal fitting 10 in the longitudinal direction of the operation shaft,
The claw metal 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.

Spring stopper 36 and pair of shaft holding arms 3
A shaft presser spring 38 having a shaft presser arm 37 is disposed at the upper part of the frame 6, and the spring lowering stopper 36 is disposed in contact with or close to the upper part of the square shaft section 32, and each shaft presser arm 37 The tip of is 4
The shaft holding arm 37 is arranged to engage with both sides of the lower part of the square shaft part 32, and each time the operating shaft 12 is rotated by 90 degrees, the elastic pressing force of the shaft holding arm 37 is applied to the slopes on both sides of the lower part of the square shaft part 32. As a result, the operating shaft 12 is held so as not to rotate unnecessarily.

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. One end of a connecting chain 41 is interposed between the upper end flanges 28 of the pair of frame constituent units 18 and 19, and a connecting bolt 42 is inserted between one end of the chain 41 and each upper end flange 28, An engaging metal fitting 43 consisting of a hook is attached to the other end of the connecting chain 41. 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 spanner, 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 in 12 has the same cross-sectional shape and same cross-sectional dimensions.

When the towing device of the above embodiment is used to tow a lifeline main rope, a rope for securing cargo, etc., each cam member 1 is attached as shown in FIGS.
3 and 14 are separated from the presser plate 9 of the pawl fitting 10, and each pawl piece 8 of the pawl fitting 10 is engaged with the engaging tooth 15 of each pawl wheel 3 on the rotating body 5 by the engagement spring 7, and then A suitable general-purpose rotating tool (not shown) is engaged with the square shaft portion 17 of the rotating body 5, and the rotating body 5 is rotated in the direction of arrow A in FIG. 4 by the rotating tool. 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. As shown in FIG. 9, the pawl fitting position holding cam member 13 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.

Further, by rotating the operating shaft 12 by 90 degrees in the direction of arrow C from the state shown in FIGS. 3 and 4,
The pawl fitting 10 can be rotated to the disengaging position via the pawl detachment position holding cam member 14 against the force of the engagement spring 7, and the pawl fitting can be locked in the detached state as shown in FIG. can. 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, 1 are constructed by press working a steel plate.
9 are connected with rivets 29 etc., and the frame 6 is assembled.
By configuring this, 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 6 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. Furthermore, since the frame 6 has various functions such as a protective cover, bearing, chain guide, and chain stripper, the structure can be simplified and the number of parts can be reduced. It can be manufactured at low cost.

Further, in the case of the above embodiment, a large number of engaging teeth 15 are provided at a constant pitch on the side of the load sheave 2.
and an arcuate bearing surface 1 located at the top of each engaging tooth.
Since the rotating body 5 is constructed by integrally providing the ratchet wheel 3 which also serves as a support shaft and the rotary tool engagement shaft 17, the ratchet wheel, the support shaft and the rotary tool engagement shaft 17 are provided 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 power tool engagement shaft in series, and therefore the traction device main body including the rotating body 5 can be made smaller. This makes it possible to reduce the weight, improve the handling of the traction device, and manufacture the traction device at low cost.

FIG. 11 shows another embodiment of the present invention, in which the operating shaft 12 is arranged above and parallel to the support shaft 11 for the claw metal fitting, but the other configuration is the same as that of the previous embodiment. It is similar to

When carrying out this invention, a ratchet wheel 3 which 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 without engaging teeth may be provided on the other side of the load sheave 2. Often, in this case, a claw metal fitting with one claw piece is used. Further, the engaging fitting 43 may be attached to the upper part of the frame 6 via a connecting fitting such as a universal joint.

As the engaging fittings 39 and 43, other arbitrary engaging fittings may be used instead of the hooks, and the connecting chain 41 and the engaging fitting 43 are omitted, and the upper end of the frame 6 is An engaging device made of a wire rope having a looped portion may be attached. Furthermore, the operating shaft 12 may be rotated by fixing a handle to the outer end of the operating shaft 12 without providing the square shaft portion 35 for fitting a rotating tool, and holding the handle by hand. good.

〔Effect of the invention〕

According to this invention, the rotating body 5, which includes the load sheave 2, the anti-reverse ratchet wheel 3, and the rotary tool engagement shaft 4, is rotatably supported by the frame 6 and is pressed by the engagement spring 7. In the claw metal fitting 10 for preventing reverse rotation, which includes a claw piece 8 that is engaged with the ratchet wheel 3 and a presser plate 9 that is connected to the base end of the claw piece 8, the middle part of the claw piece 8 is as described above. It is pivotally connected to the frame 6 by a support shaft 11 for the claw metal fitting parallel to the axis of the rotating body 5,
The operating shaft 12 rotatably supported by the frame 6 has a cam member 13 for holding the claw engagement position that is to be engaged with one side of the operating shaft in the longitudinal direction of the holding plate 9, and a cam member 13 for holding the engagement position of the holding plate 9. Since the claw metal detachment position cam member 14 to be engaged with the other side in the longitudinal direction of the operating shaft in 9 is provided at a different phase,
The claw metal fitting 10 is rotated by the operation shaft 12 against the force of the engagement spring 7 via the claw metal detachment position holding cam member 14.
Therefore, when adjusting the length of the towing side of the traction chain 1, the pawl metal fitting can be held in a state separated from the ratchet wheel 3 by hand. Since this is not necessary, the length of the traction chain 1 for traction can be easily adjusted, and the cam member 13 for holding the pawl fitting engagement position can be rotated by the operating shaft 12. By arranging the claw metal fitting 10 in a state where it can engage with the presser plate 9, it is possible to lock the claw metal fitting in the engaged state, and further, by rotating each cam member 13, 14 by the operation shaft 12, the claw metal fitting 10 can be locked. By keeping the rotating body 5 separated from the presser plate 9, the rotating body 5 can be rotated and pulled. Therefore, by simply rotating the operating shaft 12, the pawl metal release lock state and the pawl metal engagement state can be changed. Effects such as being able to switch to a locked 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;
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 pawl is locked in the engaged state, Fig. 8 is a longitudinal sectional side view of the central part of the load sheave portion and other parts in Fig. 7, and Fig. 9 is FIG. 7 is a longitudinal side view showing the side part of the lower part and the center part of the upper part cut away, and FIG. 10 is a longitudinal side view showing the main body of the traction device when it is locked in the claw metal release 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 rotating tool engagement shaft, 5 is a rotating body, 6 is a frame, 7 is an engagement spring, and 8 is a claw piece. , 9 is a holding plate, 10 is a claw metal fitting for preventing reverse rotation, 11 is a support shaft for the claw metal fitting, 12 is an operating shaft, 13
14 is a cam member for holding the pawl engagement position, 14 is a cam member for disengaging the pawl fitting, 15 is an engaging tooth, 16 is an arc-shaped bearing surface, 17 is a square shaft portion for fitting a rotary tool, 18 and 19 are a frame Constituent units: 21 is a chain guide, 22 is a chain stripper, 23 is a semi-cylindrical portion, 24 is an end plate, 26 is a lower end flange, 2
7 is a side flange, 28 is an upper end flange, 29 is a rivet, 32 is a square shaft part, 35 is a square shaft part for fitting a rotary tool, 36 is a spring stopper part, 37 is a shaft holding arm, 38 is a shaft holding part Springs, 39 and 43 are engagement fittings.

Claims (1)

[Claims] 1 Load sheave 2 wrapped around traction chain 1
A rotating body 5 comprising a ratchet wheel 3 for preventing reverse rotation and a rotary tool engagement shaft 4 is rotatably supported by a frame 6, and is engaged with the ratchet wheel 3 by being pressed by an engagement spring 7. Reversal prevention claw metal fitting 1 comprising a claw piece 8 and a presser plate 9 connected to the base end of the claw piece 8
The middle part of the claw piece 8 at 0 is pivotally attached to the frame 6 by a support shaft 11 for the claw metal fitting parallel to the axis of the rotating body 5, and the operating shaft 12 rotatably supported by the frame 6 has a A pawl fitting engagement position holding cam member 13 that is to be engaged with one side in the longitudinal direction of the operation shaft on the presser plate 9, and a pawl metal fitting that is to be engaged with the other side in the longitudinal direction of the operation shaft on the presser plate 9. A switching device for a claw metal fitting for preventing reverse rotation in a traction device, characterized in that a cam member 14 for a disengagement position is provided at a different phase.