JP7508065B2 - Extension type wire tie wagon - Google Patents

Description

This invention relates to a metal wagon used on suspension towers in wire tensioning work for power transmission line construction projects.

The above-mentioned tensioning work involves attaching the extended electric wire to a tension insulator between the tension towers with a specified tension, and then fixing it to the suspension device on the suspension tower. On the suspension tower, the electric wire is placed on a wire-drawing metal cart and tensioned to the tension tower, after which the electric wire on the metal cart of the suspension tower is attached to the suspension insulator. This metal cart is generally tilted to the higher side on the short span side and in places with a difference in elevation. The offset length between the position directly below the metal cart and the length of the wire pulled at an angle is called the clipping offset.

The wire tensioning work is carried out by repeatedly tensioning the wire while checking the slack state of the wire with the wire supported by the iron wheels and checking whether the slack state matches the predetermined slack state. If there is a clipping offset, it is not good for checking the slack state, so the inclination of the iron wheels must be corrected each time the wire is tensioned so that it is vertical.

To correct this type of tilted pulley, in actual construction, the wire is shifted in centimeters to find the position where the insulator string is vertical and marked, but (1) this involves repeatedly lifting the wire with a winch and shifting the clamp each time. (2) The wire is pulled using the ratchet function of a tool (a belt-type grip made by Fujii Denko Co., Ltd.) that secures the wire to the pulley, which is used during work stoppages, as a measure against strong winds, and to prevent damage to the wire. (3) The worker kicks the pulley. (4) A tension wire pulley for suspension towers (see Figures 18 and 19) is used.

In the above conventional method (1), if there is only one suspension tower in the middle, work can be done on the spot, but when multiple towers are suspended in succession, if one point moves, the tension in the next one changes, so although they are worked on in coordination, it is not easy to match all the towers, and the work of winding the winch on the tower and lifting the wire must be repeated each time. In the above case of (2), the installation must be done for the purpose of tensioning the wire. In the above case of (3), it is dangerous for the workers and it is troublesome to maintain the position. In the above case of (4), the tensioning wire car for the suspension tower does not have a wire extension function, so after extending the wire with a conventional wire car, the wire must be transferred to the tensioning wire car 50 attached to the yoke. Also, using the slack adjustment fitting 51 shown in Figures 18 and 19, the fitting 51 is inserted into the gap between the shoe 50a of the tensioning wire pulley 50 and fine adjustment is made using a lever, but this operation requires considerable force and effort to maintain the position. 52 indicates the lashing belt that supports the fulcrum of the slack adjustment fitting 51.

As described above, conventional methods have the drawback of being labor-intensive. Therefore, a wire-drawing pulley, shown in Patent Document 1, which is equipped with a wheel fixed to a rotating shaft attached to a frame body, has been developed in which one end of a rotating lever is connected to one end of the rotating shaft so that it can be selectively fixedly connected by a clutch, and an actuator for forcibly rotating the rotating lever is connected to the other end of the rotating lever, and the actuator is an electric type that can be remotely operated, so that when a tilt occurs in the wire-drawing direction, the tilt can be eliminated by forcibly rotating the rotating lever to rotate the wheel.

Japanese Patent Application Laid-Open No. 5-260620

However, the device shown in Patent Document 1 has a structure in which the actuator and clutch are electrically operated, so it is heavy and unsuitable for hanging from a steel tower. It also has disadvantages such as a complex structure and high manufacturing costs.

This invention was made with an eye on these problems, and aims to provide a wire tensioning cart that can be attached to a yoke or the like for wire tensioning work, can be used to tension the wire without having to transfer it, has a simple and lightweight structure, and requires little effort from the worker.

The invention of claim 1 relates to a crawler type iron wheel made of an endless track body having a number of shoes on the outside, the iron wheel having a notched guide groove with a rear end extending from the edge of the frame on both sides of the iron wheel to the center of the circular inner circumference of the endless track body, the iron wheel body having a plurality of pin holes on the side of the rear end of the guide groove, a rotating shaft to which a sprocket is fixed is inserted into a support body, a worm wheel is fixed to the rotating shaft protruding outside the support body, a worm that meshes with the worm wheel is supported by a bearing body protruding from the outside of the support body, the outer circumferential cross section of the worm protruding from the bearing body is made into a square section, and the worm is supported from a plurality of points inside the support body. The jig comprises a pin that can be freely fitted into the pin hole, knobs with a larger diameter than the rotating shaft are provided on both ends of the rotating shaft, and at least one of the knobs is capable of sliding and being fixed in the axial direction of the rotating shaft, and with one knob of the jig pulled outward, both ends of the rotating shaft are inserted into each guide groove of the pulley body, and when the rotating shaft reaches the inner end of each guide groove, the sprocket engages with the inner circumference of the endless track body with each pin of the support body inserted into each pin hole, and in this state, one knob is slid toward the center of the rotating shaft to fix the knob to the rotating shaft, and the jig is fixed to the pulley body in a freely detachable manner.This is a wire extension-compatible tensioning pulley.

The invention of claim 2 is a wire extension type tension pulley described in claim 1, in which the knob that can slide and be fixed in the axial direction of the rotation shaft of the jig has a spring that is constantly biased toward the center of the rotation shaft.

The invention of claim 3 relates to a crawler type iron wheel consisting of an endless track body having a number of shoes on the outside, wherein a rotating shaft is provided on the inside of the inner circumference of the endless track body, both ends of the rotating shaft are rotatably supported by frames on both sides of the iron wheel, a sprocket that meshes with the inner circumference of the endless track body is fixed to the rotating shaft, a worm wheel is fixed to the rotating shaft protruding outward from one of the frames, a first bearing body is rotatably provided on the frame beside the worm wheel, one end of the worm is rotatably supported by the first bearing body, and the worm wheel is The frame is provided with a second bearing body that supports the other end of the worm by passing it through a long hole of the frame so that the other end can slide and rotate freely within the long hole, and the worm is configured to change between a state in which it is engaged with the worm wheel and a state in which it is not engaged by sliding its other end within the long hole.The other end of the worm that protrudes outward from the second bearing body has an angular cross-sectional portion, the worm is capable of rotating freely around the first bearing body, and the other end of the worm is capable of being fixed to the second bearing body while engaged with the worm wheel.

The invention of claim 4 relates to the wire extension-compatible tensioning wheel of claim 3, in which the cross-sectional square portion of the worm is made of a knob with a larger diameter than the worm provided at the other end of the worm, the knob has a small diameter step on the side of the second bearing body, the knob is slidable in the axial direction of the worm, the small diameter step is biased by a spring so that it enters the large diameter portion continuing into the long hole of the second bearing body, and the knob is configured to be unable to rotate around the axis of the worm.

The invention of claim 5 is a crawler type metal wheel having an endless track body with a number of shoes on the outside,
A rotating shaft is provided on the inner periphery of the endless track body, both ends of the rotating shaft are rotatably supported by frames on both sides of the wheel, a sprocket that meshes with the inner periphery of the endless track body is fixed to the rotating shaft, a ratchet gear is fixed to the rotating shaft that protrudes outward from one of the frames, the tip of the rotating shaft that protrudes outward from the ratchet gear has a square cross-sectional portion, a ratchet pawl that engages with the ratchet gear is rotatably provided on the frame, and the ratchet pawls face each other with a gap on one side of the shaft. The ratchet pawl is fixed in place in such a state that the ratchet pawl is fixed in place in such a manner ... not fixed in place in such a manner that the ratchet pawl is not fixed in place in such a manner that the ratchet pawl is not fixed in place in such a manner that the ratchet pawl is not fixed in place in such a manner that the ratchet pawl is not fixed in place in such a manner that the ratchet pawl is not fixed in place in such a manner that the ratchet pawl is not fixed in place in such a manner that the ratchet pawl is not fixed in place in such a manner that the ratchet pawl is not fixed in place in such a manner that the ratchet pawl is not fixed in place in such a manner that the ratchet pawl is not fixed in place in such a manner that the ratchet pawl is not fixed in place in such a manner that the ratchet pawl is not fixed in place in such a manner that the rat

The invention of claim 6 relates to a gold wheel having an integral rotating shaft at the center of a circular wheel, both ends of the rotating shaft being supported rotatably by a frame, one end of the rotating shaft protruding to one outside of the frame, a spline hole being provided on one end face of the protruding rotating shaft, and pin holes being provided at multiple locations on the outer surface of the frame beside one end of the rotating shaft. The gold wheel body includes a rotating shaft having a spline shaft at one end that can be freely fitted into the spline hole, which is passed through a through hole of a support, and a rotating shaft protruding to the outside of the support is provided with a spline hole at one end. A worm wheel is fixed, a worm engaged with the worm wheel is rotatably supported on a bearing body protruding from the outer surface of the support, one end of the worm protruding outside the bearing body has a square cross-sectional portion, and a jig has a plurality of pins protruding from the inner surface of the support that can be freely fitted into the pin holes, and the spline shaft of the jig is inserted into the spline hole of the iron wheel body, and the pins of the jig are inserted into the pin holes of the iron wheel body so that the jig can be freely fixed to the iron wheel body.This is a wire tensioning iron wheel that can be used for wire drawing.

According to the inventions of claims 1 to 6, the wire can be extended while still attached to the yoke, eliminating the need to transfer the wire and allowing the wire to be tightened as is, thereby reducing the time required for the work. In addition, the simple structure of simply attaching a mechanism for moving a chain or wheel with a small force to a conventional pulley reduces manufacturing costs. Furthermore, the mechanism for moving a chain or wheel with a small force is lightweight, making it ideal for pulleys used on steel towers.

In particular, the inventions of claims 1, 2 and 6 are separated into the pulley body and the jig, and when necessary, the jig can be easily attached to the pulley to move the chain or wheel, making the work easier. In addition, the jig is not large, and is a sprocket and worm set attached to the rotating shaft, and is small and lightweight, making it easy for workers to carry it to the top of the tower.

Furthermore, according to the invention of claim 2, the worker can pull the knobs on both ends of the rotating shaft to fit the rotating shaft of the jig into the end of the guide groove, and then remove his hands from the knobs to attach the jig to the pulley body with a single touch.

Furthermore, according to the invention of claim 4, the worm can be rotated around the first bearing body while the knob at one end of the worm is pulled outward, and the worm can be engaged with or disengaged from the worm wheel. Also, when the knob is released while the worm is engaged with the worm wheel, the other end of the worm can be fixed to the second bearing body, making the operation easy.

Furthermore, according to the invention of claim 5, when one of the ratchet pawls of the ratchet mechanism is engaged with the ratchet gear, the ratchet gear rotates in one direction and the chain also rotates, but the ratchet gear does not move and the chain does not rotate in the opposite direction. Also, when the depression at the top of one of the ratchet pawls is pressed with a pressing member, each of the ratchet pawls is not engaged with the ratchet gear, and the ratchet gear becomes free, allowing the wire to be drawn. In this way, the worker can easily and quickly carry out the wire drawing work that follows the wire drawing work.

FIG. 2 is a front view of the state in which a jig for a wire extension-compatible tension wire car according to the first embodiment of the present invention is attached. FIG. 2 is a front view of the extension-compatible tension wire car of the first embodiment of the present invention with the jig removed. FIG. 2 is a side view of the extension-compatible tension wire car with the jig removed, according to the first embodiment of the present invention. 1A and 1B are diagrams showing a jig that can be attached to a wire extension type tension pulley according to a first embodiment of the present invention, in which FIG. 1A is a front view and FIG. 1 is an explanatory diagram showing the state in which a chain connected to the shoe of a wire extension type tensioning wire pulley of the first embodiment of the present invention is engaged with a sprocket of a jig. FIG. 1 is a side cross-sectional view of a state in which a jig is being attached to a wire extension-compatible tension wire pulley according to a first embodiment of the present invention. FIG. FIG. 5 is a partial cross-sectional front view of a wire extension-compatible tension wire pulley according to a second embodiment of the present invention. 1A and 1B are diagrams showing the second bearing body of the worm of a wire drawing type tension wire pulley of embodiment 2 of the present invention, in which FIG. 1A is an enlarged front cross-sectional view of the second bearing body, and FIG. 1B is an enlarged side view of the second bearing body. FIG. 11 is a front view of a wire extension type tension wire car according to a third embodiment of the present invention. FIG. 11 is a side view of a wire extension type tension wire car according to a third embodiment of the present invention. FIG. 11 is an enlarged front view of the main parts of the ratchet mechanism of the wire extension type tensioning pulley of the third embodiment of the present invention when in use. FIG. 11 is an enlarged front view of the main parts of the ratchet mechanism of the wire extension type tensioning pulley of the third embodiment of the present invention when not in use. FIG. 11 is a front view of a wire extension type tension wire pulley of an embodiment 4 of the present invention with the jig removed. 11A and 11B are diagrams showing a jig for a wire-drawing type tensioning wire pulley according to a fourth embodiment of the present invention, in which FIG. FIG. 11 is a partially cross-sectional side view of a wire extension-compatible tension wire pulley according to a fourth embodiment of the present invention, with the jig removed. FIG. 11 is a front view of a wire extension type tension wire wagon with a jig attached according to a fourth embodiment of the present invention. FIG. 11 is a partially cross-sectional side view of a wire extension-compatible tension wire wagon with a jig attached according to a fourth embodiment of the present invention. FIG. 1 is a front view of a conventional tension wire pulley using a slack adjustment fitting. FIG. 1 is a side view of a conventional tension wire pulley using a slack adjustment fitting.

(Embodiment Example 1)
A wire extension type tension wire wagon according to a first embodiment of the present invention will be described with reference to Figs.

The wire extension-compatible tension wire pulley A of this embodiment 1, as shown in FIG. 1, is composed of a crawler-type pulley body 1 and a jig 2 that can be attached and detached to the pulley body 1. The crawler-type pulley body 1 is equipped with an endless track body composed of a chain 1b with multiple shoes 1a on the outer periphery. The pulley body 1 also has frames 1c on the front and back. The lower ends of the hanging members 1d are rotatably attached to the front and back frames 1c. Also, as shown in FIG. 2, a notched guide groove 3 is provided with a rear end 3a that extends from the inner peripheral edge of the front and back frames 1c of the pulley body 1 to the center of one of the inner circular parts of the endless track body, and two pin holes 4, 4 are provided on one side of the guide groove 3.

As shown in FIG. 4, the jig 2 has a rotating shaft 6 with a sprocket 5 fixed to one end penetrating a plate-shaped support 7, a worm wheel 8 fixed to the other end of the rotating shaft 6 protruding outside the support 7, a worm 9 that meshes with the worm wheel 8 is supported by two bearings 10, 10 protruding from the outside of the support 7, and a square section 11 is provided on one end of the worm 9 protruding from one of the bearings 10, giving it a square outer circumferential cross section.

In addition, pins 12, 12 that can be freely fitted into the pin holes 4 protrude from two points on the inside of the support body 7. Knobs 13, 13 with a diameter larger than that of the rotating shaft 6 are provided on both ends of the rotating shaft 6, and each knob 13 is freely slidable in the axial direction of the rotating shaft 6 and is constantly pressed inward in the longitudinal direction of the rotating shaft 6 by being biased by an internal spring.

When the jig 2 is attached to the iron wheel body 1, both knobs 13, 13 of the jig 2 are pulled outward as shown in Figure 6, and both ends of the rotating shaft 6 are inserted into the guide grooves 3 of the iron wheel body 1. When the rotating shaft 6 reaches the inner end 3a of each guide groove 3, the sprocket 5 engages with the inner circular portion of the chain 1b with each pin 12 of the support 7 inserted into each pin hole 4. When the knobs are released in this state, the spring force causes the rotating shaft 6 to slide toward the center, and it is fixed to each frame 1c of the iron wheel body 1. This fixes the jig 2 to the iron wheel body 1.

Therefore, when using the wire extension type tensioning pulley A for wire extension, the jig 2 is removed, and after the electric wire is extended, the jig 2 is attached as described above when tensioning the electric wire. By engaging a wrench or the like with the square portion 11 at one end of the worm 9 and turning the worm 9, the worm wheel 8 rotates integrally with the rotating shaft 6, the chain 1b of the pulley body 1 rotates due to the sprocket 5 at one end of the rotating shaft 6, and the wire extension type tensioning pulley A with the electric wire hung on the shoe 1a on the outer periphery moves, the inclination of the pulley A is eliminated, and the pulley A becomes vertical.

In addition, the direction of rotation of the worm 9 can be changed depending on the tilt of the wire-drawing compatible pulley A after the wire is drawn. Also, since the guide grooves 3 for mounting the jig 2 are provided on the left and right sides of the pulley body 1, the jig 2 can be mounted on either guide groove 3. Therefore, by determining the mounting position and the rotation direction of the worm 9 according to the situation, any tilt of the pulley A can be eliminated.

(Embodiment 2)
7 and 8 show a wire extension type tension pulley B according to a second embodiment of the present invention. The wire extension type tension pulley B differs from the wire extension type tension pulley A in that the jig 2 is attached integrally to the pulley body 1, and the basic configuration, the rotating shaft 6, the sprocket 5, the support 7, the worm wheel 8 and the worm 9 are the same as those described above.

In this embodiment 2, the worm 9 that meshes with the worm wheel 8 is detachably attached to the worm wheel 8. The support 7 is fixed to the frame 1c of the wheel body 1 with bolts or the like, and the first bearing body 14 provided at one end of the worm 9 is rotatably attached to the support 7 with a pin 15. The other end of the worm 9 is supported by a second bearing body 16 provided on the support 7. As shown in FIG. 8, the second bearing body 16 has a long hole 17 with a large diameter portion 17a at the upper and lower ends, and the other end of the shaft of the worm 9 is loosely inserted into the long hole 17 and can slide freely within the long hole 17. As a result, the worm 9 can rotate freely around the pin 15 of the first bearing body 14.

A knob 18, which has an outer diameter larger than that of the worm 9, is fitted to the other end of the worm 9 so as to be able to slide freely in the axial direction of the worm 9. The knob 18 is configured so as not to be able to rotate around the axis of the worm 9 due to a splined shaft or the like. Furthermore, the knob 18 is constantly biased toward the center of the worm 9 by a spring. The cross-sectional outer shape of the knob 18 is also rectangular.

Then, with the worm 9 engaged with the worm wheel 8, the other end of the worm 9 is fixed by fitting the small diameter end 18a of the knob 18 into the large diameter portion 17a at the upper end of the long hole 17 of the second bearing body 16. On the other hand, if the knob 18 is pulled outward against the force of the spring, the large diameter portion 17a and the small diameter end 18a of the knob 18 will disengage, and the shaft of the worm 9 will slide inside the long hole 17, tilting the worm 9 around the pin 15 as shown by the two-dot chain line in Figure 7, and disengaging the worm wheel 8. In this state, if the small diameter end 18a of the knob 18 is fitted into the large diameter portion 17a at the lower end of the long hole 17, the worm 9 will be fixed.

Therefore, when the wire-drawing compatible tension pulley B is used for drawing wire, the worm 9 is disengaged from the worm wheel 8 and used in an inclined state. Then, when using it as a tension pulley after drawing wire, the worm 9 is horizontally fixed to the second bearing body 16 so that it engages with the worm wheel 8. To correct the inclination of the pulley B to a vertical position, a tool such as a wrench is attached to the knob 18 at the other end of the worm 9, and the worm 9 is turned to rotate the worm wheel 8 and the rotating shaft 6, which in turn rotates the sprocket 5, and the chain 1b is moved to adjust the pulley B to be vertical.

(Embodiment 3)
9 to 12 show a tension wire pulley C adapted for wire extension according to a second embodiment of the present invention.

As shown in Figure 9, the extension-compatible tension wire pulley C is made up of a crawler-type pulley body 21. The crawler-type pulley body 21 is equipped with an endless track body made up of a chain 21b having a number of shoes 21a on its outer periphery. The pulley body 21 also has frames 21c on the front and back. The lower ends of the hanging members 21d are rotatably attached to these frames 21c on the front and back.

In addition, sprockets 22 mesh with the inner circular portion of the chain 21b that forms the endless track on both sides of the wheel body 21, and one end of the rotating shaft 23 that is integral with the sprocket 22 passes through a hole in the frame 21c on the front side of the wheel body 21, and a ratchet gear 24 is fixed integrally to the rotating shaft 23 that protrudes from the outer surface of the frame 21c. The tip of the rotating shaft 23 that protrudes from the outer surface of the ratchet gear 24 forms a square section 23a.

A ratchet pawl 25 that can be engaged with the ratchet gear 24 is rotatably mounted on the frame 21c by a pin 26, and the ratchet pawl 25 has two vertices of a deformed triangle that are pawls 25a and 25b, and the other vertex is provided with a recess 25c, and the pin 26 is mounted in the approximate center of the ratchet pawl 25. A pointed pressing member 27 is also provided on the frame 21c, and a spring 27a biases the pointed end 27b to press one vertex of the ratchet pawl 25 that has the recess 25c. A cover body 28 is also provided on the ratchet gear 24, ratchet pawl 25, and pressing member 27.

11, when the ratchet pawl 25 is rotated and the pointed end 27b of the pressing member 27 presses the upper side of the apex having the recessed portion 25c of the ratchet pawl 25, the lower pawl 25b is engaged with the teeth of the ratchet gear 24, and the ratchet gear 24 is prevented from rotating in the clockwise direction. When the ratchet pawl 25 is rotated so that the pointed end 27b presses the lower side of the apex having the recessed portion 25c of the ratchet pawl 25, the upper pawl 25a is engaged with the teeth of the ratchet gear 24, and the ratchet gear 24 is prevented from rotating in the counterclockwise direction. When the ratchet pawl 25 is rotated and the pointed end 27b of the pressing member 27 presses the recessed portion 25c of the ratchet pawl 25, as shown in FIG. 12 , the pawls 25a, 25b are engaged in a state separated from the teeth of the ratchet gear 24.

Therefore, when using the wire-drawing compatible tension pulley C to draw an electric wire, as shown in FIG. 12, neither of the pawls 25a nor 25b of the ratchet pawl 25 is engaged with the teeth of the ratchet gear 24, and when correcting the inclination of the pulley C after drawing, for example, as shown in FIG. 11, the pawl 25b is engaged with the teeth of the ratchet gear 24, and the rotating shaft 23 is rotated counterclockwise in FIG. 11 to move the chain 21b and make the pulley C vertical. Also, to rotate the chain 21b clockwise, the pawl 25a of the ratchet pawl 25 can be engaged with the teeth of the ratchet gear 24.

(Embodiment 4)
13 to 17 show a wire extension type tensioning wagon D according to a fourth embodiment of the present invention.

As shown in Figures 13 and 15, the extension-compatible wire pulley D of this embodiment example 1 is composed of a circular wheel-shaped pulley body 31 and a jig 32 that can be attached and detached to the pulley body 31. The pulley body 31 is rotatably supported by hanging members 31c on both sides of the rotation axis 31b of the wheel 31a.

The rotating shaft 31b is provided integrally with the wheel 31a, penetrating the center thereof. As shown in FIG. 15, one end of the rotating shaft 31b protrudes from the outer surface of one of the hanging members 31c, and a reinforcing frame 33 is fixed to the hanging member 31c so as to surround one end of the protruding rotating shaft 31b. A spline hole 34 is drilled in one end face of the protruding rotating shaft 31b. Furthermore, pin holes 35, 35 are provided in two places on the outer surface of the reinforcing frame 33 beside the rotating shaft 31b.

As shown in FIG. 14, the jig 32 has a support 38 that supports a rotating shaft 37 having a spline shaft 36 at one end, and a worm wheel 39 is fixed to the rotating shaft 37 that protrudes outward from the support 38. A worm 40 that meshes with the worm wheel 39 is rotatably supported by a pair of bearing bodies 41, 41 protruding from the outer surface of the support 38. The cross section of the worm 40 protruding from one of the bearing bodies 41 is square, forming a square portion 40a. Two pins 42, 42 that can be freely fitted into the pin hole 35 are protruding from the inner surface of the support 38. Furthermore, a knob 43 is provided on the outer surface of the support 38.

When the wire is stretched using this wire stretching type tension pulley D, and when the pulley D is in a tilted state, the jig 32 is attached to the pulley D. To attach it , the knob 43 of the jig 32 is held by hand and the two pins 42, 42 of the jig 32 are fitted into the two pin holes 35, 35 of the reinforcing frame 33 of the pulley body 31, and the spline shaft 36 at one end of the rotating shaft 37 is fitted into the spline hole 34 of the rotating shaft 31b of the pulley body 31 .

The support 38 is then fixed to the reinforcing frame 33 by suitable means, for example, bolts, nuts, etc. When the worm 40 is rotated by fitting a tool such as a wrench into the square portion 40a of the worm 40, the worm wheel 39 rotates, and the rotating shaft 31b which is integrated with the spline shaft 36 by fitting into the spline hole 34 rotates. This rotates the wheel 31a of the wire-drawing-compatible tensioning pulley D, eliminating the tilt.

In the above-mentioned second and third embodiments, the rotating shaft 6 or 23 having the sprocket 5 or 22 is provided on the inner circumference of one of the circular endless track bodies consisting of the chain 1b or 21b of the pulley body 1 or 21, but the positions of the rotating shaft 6 or 23 and the sprocket 5 or 22 are not limited to this and may be on the inner circumference of the endless track body.

The method of fixing the support 7 to the frame 1c in the first embodiment, the method of fixing the worm 9 to the second bearing body 16 in the second embodiment, and the method of fixing the support 38 in the fourth embodiment are not limited to those in each embodiment, and can be fixed detachably by any suitable method or means.

A: Wire extension type tensioning metal bar B: Wire extension type tensioning metal bar C: Wire extension type tensioning metal bar D: Wire extension type tensioning metal bar 1: tensioning metal bar body 1a: shoe 1b: chain 1c: frame 1d: hanging member 2: jig
3 Guide groove 3a Deep end portion 4 Pin hole 5 Sprocket 6 Rotating shaft 7 Support
8 Worm wheel 9 Worm 10 Bearing 11 Square portion
12 pin 13 knob 14 first bearing body 15 pin 16 second bearing body 17 long hole
17a Large diameter hole 18 Knob 18a Small diameter end 21 Pull body 21a Shoe 21b Chain 21c Frame 21d Suspension member 22 Sprocket 23 Rotating shaft 23a Square portion 24 Ratchet gear 25 Ratchet pawl
25a Claw 25b Claw 25c Recess 26 Pin 27 Pressing member 27a Spring 27b Pointed end 28 Cover body 31 Wheel body 31a Wheel 31b Rotating shaft 31c Suspension member 32 Jig 33 Reinforcing frame 34 Spline hole 35 Pin hole 36 Spline shaft 37 Rotating shaft 38 Support 39 Worm wheel 40 Worm 40a Square portion 41 Bearing body 42 Pin 43 Knob

Claims (6)

In a crawler-type metal vehicle having a caterpillar body with a number of shoes on the outside,
A caster body having a notched guide groove with a deep end portion extending from the edge of the frame on both sides of the caster to the center of the circular inner circumference of the endless track body, and a plurality of pin holes provided beside the deep end portion of the guide groove;
a rotating shaft with a sprocket fixed thereto is inserted through a support, a worm wheel is fixed to the rotating shaft protruding outside the support, a worm that meshes with the worm wheel is supported by a bearing body protruding from the outside of the support, the outer circumferential cross section of the worm protruding from the bearing body is made into a square section, pins that can be freely fitted into the pin holes are protruded from multiple points inside the support, knobs with a diameter larger than that of the rotating shaft are provided on both ends of the rotating shaft, and at least one of the knobs is a jig that can be slid and fixed in the axial direction of the rotating shaft,
This wire-drawing compatible tension wire pulley is characterized in that, with one knob of the jig pulled outward, both ends of the rotating shaft are inserted into each guide groove of the pulley body, and when the rotating shaft reaches the inner end of each guide groove, the sprocket engages with the inner circumference of the endless track body with each pin of the support body inserted into each pin hole, and in this state, one knob is slid toward the center of the rotating shaft to fix the knob to the rotating shaft, and the jig is fixed to the pulley body in a freely detachable manner. The tensioning wire pulley of claim 1, characterized in that the knob, which can slide and be fixed in the axial direction of the rotation shaft of the jig, has a spring that is constantly biased toward the center of the rotation shaft. In a crawler-type metal vehicle having a caterpillar body with a number of shoes on the outside,
A rotating shaft is provided on the inner periphery of the endless track body, both ends of the rotating shaft are rotatably supported by frames on both sides of the wheel, a sprocket that meshes with the inner periphery of the endless track body is fixed to the rotating shaft, and a worm wheel is fixed to the rotating shaft that protrudes outward from one of the frames,
A first bearing body is rotatably mounted on a frame beside the worm wheel, one end of the worm is rotatably supported on the first bearing body, and a second bearing body is mounted on the frame, which supports the other end of the worm by passing it through a long hole of the first bearing body so that the other end of the worm can slide and rotate freely within the long hole, and the worm can be changed between a state in which it is engaged with the worm wheel and a state in which it is not engaged with the worm wheel by sliding the other end of the worm within the long hole.
This wire extension-compatible tensioning pulley is characterized in that the other end of the worm protruding outward from the second bearing body has a square cross-sectional portion, the worm is freely rotatable around the first bearing body, and the other end of the worm is freely fixed to the second bearing body while meshing with the worm wheel. The wire pulley of claim 3, characterized in that the cross-sectional square portion of the worm is made of a knob with a larger diameter than the worm provided at the other end of the worm, the knob has a small diameter step on the second bearing body side, the knob is slidable in the axial direction of the worm, the small diameter step is biased by a spring so that it enters the large diameter part continuing to the long hole of the second bearing body, and the knob is configured to be unable to rotate around the axis of the worm. In a crawler-type metal vehicle having a caterpillar body with a number of shoes on the outside,
a rotating shaft is provided on the inner periphery of the endless track body, both ends of the rotating shaft are rotatably supported by frames on both sides of the wheel, a sprocket that meshes with the inner periphery of the endless track body is fixed to the rotating shaft, a ratchet gear is fixed to the rotating shaft that protrudes outward from one of the frames, and a tip of the rotating shaft that protrudes outward from the ratchet gear is formed into an angular cross-sectional portion;
a ratchet pawl that engages with the ratchet gear is rotatably provided on the frame, the ratchet pawl having pawls at vertices facing each other with a gap between them on one side of a shaft, and a vertex having a recess on the opposite side of the shaft; and a pressing member that constantly presses the vertex portion having the recess of the ratchet pawl is provided on the frame;
This wire extension type tensioning pulley is characterized in that the pointed end of the pressing member presses one side of the apex portion having a recess of the ratchet pawl, so that one pawl engages with the teeth of the ratchet gear, or the pointed end of the pressing member fits into the apex having the recess, and in this state the ratchet pawl is fixed and each pawl is not engaged with the teeth of the ratchet gear. In a gold wheel having an integral rotating shaft at the center of a circular wheel,
a pulley body, the both ends of which are rotatably supported by a frame, one end of which protrudes to one outside of the frame, a spline hole being provided on one end surface of the protruding rotary shaft, and pin holes being provided at multiple locations on the outer surface of the frame beside one end of the rotary shaft;
a rotating shaft having a spline shaft at one end that can be freely fitted into the spline hole is passed through a through hole in a support, a worm wheel is fixed to the rotating shaft that protrudes outside the support, a worm that meshes with the worm wheel is rotatably supported by a bearing body that protrudes from the outer surface of the support, one end of the worm that protrudes outside the bearing body has an angular cross-sectional portion, and a jig has a plurality of pins that can be freely fitted into the pin holes protruding from the inner surface of the support,
This wire tensioning pulley is characterized in that the spline shaft of the jig is inserted into the spline hole of the pulley body, and the pin of the jig is inserted into the pin hole of the pulley body so that the jig can be freely fixed to the pulley body.

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