JPH025672B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a traction device used for towing a lifeline main rope at a construction site or tightening a rope for securing cargo during truck transportation. be.

[Prior art]

Conventionally, as a traction device, as disclosed in Japanese Utility Model Publication No. 43-25242, a support shaft is integrally connected to one side of a load sheave around which a chain is wound, and a support shaft is attached to the other side of the load sheave. A ratchet wheel, a support shaft, and a handle engagement shaft are sequentially arranged in series and connected integrally, and the support shafts on both sides of the load sheave are rotatably supported by a frame, and the frame includes:
A pawl piece to be engaged with the ratchet wheel is pivotally connected by an engaging spring, and the other end of a locking chain having a hook at one end is connected, and the load sheave is provided with a hook at one end. A structure in which a traction chain with a hook is wrapped around it is known.

[Problem that the invention seeks to solve]

However, in the case of the above-mentioned conventional traction device, the ratchet wheel and the support shaft are arranged in series on the side of the load sheave. The axial length of the rotating body consisting of the engagement shaft becomes longer, and as a result, the main body of the traction device including the rotating part becomes larger and heavier, which causes problems such as poor handling of the traction device and increased cost. be.

[Purpose and structure of the invention]

The object of the present invention is to provide a traction device that can advantageously solve the above-mentioned problems.
The gist of this invention is that engaging teeth 3 are provided at a constant pitch on the side of a load sheave 2 around which a traction chain 1 is wound, and an arcuate bearing surface located at the top of the engaging teeth 3. A ratchet-cum-support shaft 5 and a rotary tool engagement shaft 6 are integrally provided.
The ratchet wheel/support shaft 5 is rotatably supported by a frame 7, and the frame 7 has a pawl metal fitting that is pressed by an engagement spring 8 and engaged with the engaging teeth 3 of the ratchet wheel/support shaft 5. 9 is pivotally mounted.

〔Example〕

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

The drawing shows one embodiment of the present invention, in which a large number of inclined engagement teeth 3 provided at a constant pitch on both sides of a load sheave 2, which has a chain fitting recess around its periphery, and each engagement A ratchet/support shaft 5 having an arcuate bearing surface 4 located at the top of the teeth 3
are integrally connected, and one ratchet wheel/support shaft 5
A rotating tool engaging shaft 6 having a square shaft portion 11 for fitting a rotating tool is integrally connected to the side of the rotating body 12.
The frame structural units 13 and 14 are formed by pressing a steel plate.
Chain entry/exit opening 15 located at the bottom center
, a groove-shaped chain guide 16 located at the upper part of the opening 15, a chain stripper 17 located at the lower part of the opening 15, a semi-cylindrical portion 18 located on both sides of the lower part, and the semi-cylindrical An end plate 19 connected to the end of the portion 18 and an upper storage recess 20
, a lower end flange 21 and a side flange 22
and an upper end flange 23 of a double folded structure, and the lower end flange 21 and side flange 22 of each frame component unit 13, 14 are overlapped and connected by a rivet 24, thereby forming the frame 7. has been done.

Each arcuate support surface 4 of the ratchet-cum-support shaft 5 on both sides of the rotating body 12 is rotatably fitted into a cylindrical portion formed by a semi-cylindrical portion 18 of a pair of frame constituent units 13 and 14, The rotary tool engagement shaft 6 projects outside the frame 7 and includes a pair of claw pieces 25 that engage with the engagement teeth 3 on each of the ratchet wheels and support shafts 5, and a base end portion of each claw piece 25. The claw metal fitting 9, which is made up of a presser plate 26 that connects the parts, and a reinforcing connecting plate 27 that connects the side edges of each claw piece 25, is constructed by pressing a steel plate. Both ends of the claw metal support shaft 28 made of a round steel rod into which the piece 25 is rotatably fitted are rotatably connected to the circular hole formed by the semicircular hole provided in each frame component unit 13, 14. The end surface of the support shaft 28 for the pawl fitting faces the bottom of the notched recess 29 provided in the side flange 22, and this bottom restricts the movement of the support shaft 28 in the longitudinal direction. It acts as a stopper.

The engagement spring 8 fitted to the support shaft 28 is engaged with the frame 7 and the claw metal fittings 9, and the engagement spring 8
The pawl fitting 9 is rotated so that the pawl piece 25 is engaged with the engagement tooth 3. A square shaft portion 31 and a small diameter shaft portion 3 are provided at one end of an operating shaft 30 extending in a direction perpendicular to the support shaft 28 at the upper part of the claw metal fitting 9.
2 are integrally connected, the small diameter shaft portion 32 of which is rotatably fitted into a small diameter hole provided in one frame component unit 13, and a large diameter shaft is provided at the other end of the operating shaft 30. portion 33 and a square shaft portion 34 for fitting a rotary tool are sequentially and integrally connected to each other, and the large diameter shaft portion 33
is rotatably fitted into a large diameter hole provided in the other frame component unit 14, and the square shaft portion 34 projects outward from the frame component unit 14.

Inside the frame 7, a cam member 35 for holding the pawl engagement position and a cam member 36 for holding the pawl disengagement position are integrally provided on both sides of the operating shaft 30 in the longitudinal direction, and the cam members 35 and 36 are arranged at an angle of 180 degrees from each other. A shaft presser spring 39, which is arranged in different phases and includes a spring lowering stopper 37 and a pair of shaft presser arms 38, is arranged in the upper part of the frame 7, and the spring lowering stopper 37 is connected to the square shaft part 31. Further, the tip of each shaft holding arm 38 is arranged so as to engage with both sides of the lower part of the square shaft part 31, and rotates the operating shaft 30 by 90 degrees. At each time, the operating shaft 30 is held so as not to rotate unnecessarily by the elastic pressing force of the shaft holding arm 38 against both lower side slopes of the square shaft portion 31.

An engaging fitting 40 consisting of a hook is connected to one end of the traction chain 1 wound around the load sheave 2, and a stopper 41 for preventing slippage is attached to the other end of the chain 1. One end of a connecting chain 43 is interposed between the upper end flanges 23 of the pair of frame constituent units 13 and 14, and a connecting bolt 42 is inserted between one end of the chain 43 and each upper end flange 23, An engaging metal fitting 10 consisting of a hook is attached to the other end of the connecting chain 43. In addition, in order to enable the rotating body 12 and the operating shaft 30 to be rotated by a common rotating tool such as a spanner, a box spanner, etc., the square shaft portion 11 of the rotating tool engagement shaft 6 and the operating shaft The square shaft portion 34 in 30 has the same cross-sectional shape and the 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., as shown in FIGS. 3 and 4, each cam member 3
5 and 36 are separated from the presser plate 26 of the pawl fitting 9, and the engaging spring 8 engages each pawl piece 25 of the pawl fitting 9 with the engaging tooth 3 of each pawl/support shaft 5 on the rotating body 12. Next, a suitable general-purpose rotating tool (not shown) is engaged with the square shaft portion 11 of the rotating body 12, and the rotating body 12 is rotated in the direction of arrow A in FIG. 4 by the rotating tool. move. In this case, during or after towing, the square shaft portion 1
Even if the rotational force in the pulling direction is released from 1, the engagement between the claw piece 25 of the claw metal fitting 9 and the engagement tooth 3 on the ratchet wheel/support shaft 5 prevents the rotating body 12 from reversing, that is, rotating in the loosening direction. .

Also, by engaging the rotating tool with the square shaft portion 34 of the operating shaft 30 and rotating the operating shaft 30 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 35 can be brought into contact with or close to the front upper surface of the presser plate 26 of the pawl fitting 9 to lock the pawl fitting in the engaged state.

Further, by rotating the operating shaft by 90 degrees in the direction of arrow C from the state shown in FIGS. 3 and 4, the force of the engagement spring 8 is applied to the pawl fitting 9 via the cam member 36 for holding the pawl fitting disengagement position. 10, and can be locked in the disengaged state as shown in FIG. In this state, by pulling the traction chain 1 by hand, the rotating body 12 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 13, 1 are constructed by press working a steel plate.
4 are connected by rivets 24 or the like to form a frame, the frame can be made lighter and manufactured at lower cost than a cast iron frame.

In the case of the above-mentioned embodiment, the load acting on the frame can be evenly distributed to the left and right and the balance can be maintained, so that the frame 7 can be made thinner and lighter. Furthermore, since the frame 7 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.

When carrying out this invention, a ratchet-cum-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. If so, use a claw metal fitting with one claw piece. Further, the engaging fitting 10 may be attached to the upper part of the frame 7 via a connecting fitting such as a universal joint. Any other engaging metal fittings 10, 40 may be used in place of the hooks, and the engaging metal fittings 10 and the connecting chain 43 may be omitted, and the upper end portion of the frame 7 may be An engaging device made of a wire rope having an annular portion may be attached.

〔Effect of the invention〕

According to this invention, the side portion of the load sheave 2 around which the traction chain 1 is wound is provided with engaging teeth 3 provided at a constant pitch and an arcuate bearing surface 4 located at the top of the engaging teeth 3. Since the ratchet wheel and support shaft 5 and the rotary tool engagement shaft 6 are integrally provided, and the ratchet wheel and support shaft 5 is supported by the frame 7,
The length of the rotating body 12 consisting of the load sheave 2, the ratchet wheel/support shaft 5, and the rotary tool engagement shaft 6 can be shortened, and therefore the traction device body including the rotating body 12 can be made smaller and lighter. As a result, the handling of the traction device is improved, and the traction device can be manufactured at low cost.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which FIG. 1 is a front view of a traction device, and FIG. 2 is a side view thereof. Figure 3 is a longitudinal sectional front view showing the traction device main body when the cam member is rotated to the neutral position;
5 is a longitudinal sectional side view thereof, FIG. 5 is a longitudinal sectional front view showing the relationship between the shaft pressing spring, the square shaft portion of the operating shaft, and the frame, and FIG. 6 is a partially longitudinal sectional 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. In the figure, 1 is a traction chain, 2 is a load sheave, 3 is an engagement tooth, 4 is an arcuate bearing surface, 5 is a ratchet/support shaft, 6 is a rotary tool engagement shaft, 7 is a frame,
8 is an engagement spring, 9 is a claw metal fitting, 10 is an engagement metal fitting,
11 is a square shaft portion for fitting a rotary tool; 12 is a rotating body; 1
3 and 14 are frame constituent units, 16 is a chain guide, 17 is a chain stripper, 18
is a semi-cylindrical part, 19 is an end plate, 21 is a lower end flange, 22 is a side flange, 23 is an upper end flange,
24 is a rivet, 25 is a claw piece, 26 is a holding plate, 2
8 is a support shaft for the pawl fitting, 30 is an operating shaft, 31 is a square shaft portion, 35 is a square shaft portion for fitting a rotary tool, 35 is a cam member for holding the pawl fitting engagement position, 36 is a pawl fitting detachment position holding cam member, 37 is a spring lowering stopper, 38
39 is a shaft presser arm, 40 is an engagement fitting.

Claims (1)

[Claims] 1 Load sheave 2 wrapped around traction chain 1
Engagement teeth 3 provided at a constant pitch on the sides of and an arcuate bearing surface 4 located at the top of the engagement teeth 3.
A ratchet-cum-support shaft 5 and a rotary tool engagement shaft 6 are integrally provided, and the ratchet-cum-support shaft 5 is rotatably supported by a frame 7. The ratchet wheel/support shaft 5 is pressed by the spring 8.
A traction device characterized in that a pawl fitting 9 that is engaged with an engaging tooth 3 is pivotally mounted.