Gear puller

Abstract

To provide a gear puller in which a pawl arm can be smoothly opened and closed with one hand without increasing shape and weight of a whole thereof, and for which handling is easy.SOLUTION: A gear puller A is configured from a center bolt 10, a center plate 1, a pair of left and right pawl arms 20 and an operation wire 30. The center bolt 10 is threaded into a female thread part 5 of the center plate 1. Further, the pair of left and right pawl arms 20 are slidably attached to a guide part 2 which extends left and right from the female thread part 5 of the center bolt 10. The pawl arm 20 is provided with a claw part 28 which locks a pulling object C pulled out from a shaft B. The operation wire 30 is so provided as to surround the center plate 1, is fixed to a wire attachment part 24L of one pawl arm 20L provided on a front side of the center plate 1, and is fixed to a wire attachment part of the other pawl arm 20R provided on a back side of the center plate 1.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an improvement in a lightweight gear puller that allows one person to efficiently pull out an object to be pulled, such as a gear or pulley, from a shaft. [Background technology]

[0002] Gears, pulleys, and other pulling objects of various sizes are attached to the shafts of various machines. When these pulling objects need to be replaced, a gear puller is used to pull them out of the shaft. The mounting holes of these pulling objects fit together with high precision on the shaft, and it is necessary to pull the pulling objects out accurately parallel to the shaft. Furthermore, these objects to be drawn vary in diameter from large to small, thickness from large to thin, and are generally heavy.

[0003] An example of such a gear puller is one that consists of a center bolt with a thread engraved on its outer surface, a center plate with a female screw portion that engages with the threaded portion, a pair of claw arms with claw portions at their tips, and a link that connects the center plate and the claw arms (Patent Document 1). When using this gear puller, the claws protruding from the inside of the tips of the claw arms are hooked onto the gear at symmetrical positions on the outer periphery of the gear, and then the tip of the center bolt is pressed against the tip of the shaft, and the center bolt is rotated until the links on both shoulders of the center plate are tensioned, thereby setting the gear puller.

[0004] In this state, if a wrench or similar tool is applied to the head of the center bolt and the center bolt is rotated, the center plate and the claw arm connected to it in a swinging manner via a link will move in the direction of removing the gear, and the gear will be pulled out from the shaft. As mentioned above, the left and right claw arms of this gear puller are swingably attached to both shoulders of the center plate via links, making them difficult to handle. When using this gear puller, it is necessary to rotate the center bolt while firmly fixing both claw arms. By rotating this center bolt, the tip of the center bolt is pressed against the tip of the shaft, but until sufficient force is applied to pull out the gear, etc., the claw arm supported by the link is not stable, and if working alone, the claw part is likely to come off the gear.

[0005] Therefore, in order to reduce the time required for removal, one person had to hold both jaw arms firmly with both hands, while another person held the center plate with one hand and rotate the center bolt with the other. In other words, this gear puller was difficult to operate by one person and required two people to work together, which increased the labor required for removal during maintenance.

[0006] Therefore, a gear puller has been proposed that can be efficiently operated by one person when removing gears and the like from a shaft (Patent Document 2). In this gear puller, the center bolt is threaded into the female thread of the center plate, and a pair of left and right claw arms are slidably mounted on the female thread of the center plate, which is provided with guides that protrude symmetrically. The claw arms are made up of a claw arm body with a claw formed at the tip and an attachment body that slides along the guide.

[0007] A bearing member is provided above the center plate, and a pinion gear is attached to this bearing member, so that the pinion gear is rotatably mounted on the center plate. The rack is attached in a cantilevered manner to the left and right mounting barrels inserted through the guide. The rack is attached parallel to and above the guide so as to mesh with the pinion. The rack is cantilevered on the left and right mounting barrels so that it meshes with the pinion gear from the front and back, and the left and right claw arms open and close in unison via the pinion gear. Since the rack is installed on the left and right mounting barrels in accordance with the bearing members provided above the center plate, the overall length of the gear puller increases by the length of the bearing members.

[0008] In use, the mounting body is moved along the guide, the claw arms are opened and closed in tandem, the claws hook onto the gear, and the claw arms are fixed to the guide in this state. Next, the tip of the center bolt is pressed against the tip of the shaft, and with the axes aligned, the center bolt is rotated. This moves the claws axially together with the center plate, allowing the gear or other object to be pulled from the shaft. When one claw is moved, the other claw moves in tandem via a pinion gear, opening and closing symmetrically around the center bolt, allowing a single worker to pull out the gear from the shaft. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Utility Model Application Publication No. 5-85567 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-162551 Summary of the Invention [Problem to be solved by the invention]

[0010] However, the gear puller described in Prior Art Document 2 is equipped with a pinion gear that was not included in the gear puller of Prior Art Document 1, a pair of front and rear racks that are the same length as the guide and are provided in front and behind the guide, and a bearing mechanism that rotates and holds the pinion gear, making the weight of the entire gear puller nearly twice as heavy as that of the gear puller of Prior Art Document 1, and the height is also increased by the amount of the bearing mechanism.As described above, it is preferable that the work of pulling out gears, etc., be performed by one person in order to reduce the amount of work required, but the large size and heavy weight of the entire gear puller make it difficult for one person to perform this work.

[0011] The present invention aims to solve the problems of the conventional example and to provide a gear puller that is easy to handle and whose claw arms can be opened and closed smoothly with one hand without increasing the overall shape or weight. [Means for solving the problem]

[0012] The gear puller A according to the present invention as set forth in claim 1 has the following configuration. a center bolt (10) having a rotary operation head (11) at one end, a shaft portion (15) connected to the rotary operation head (11) with a male screw thread on the outer periphery thereof, and a center protrusion (17) at the other end that abuts against the end face of a shaft (B) on which an object (C) to be extracted is fitted; a center plate (1) including a female screw portion (5) into which the center bolt (10) is threadably inserted, and guide portions (2) extending from the female screw portion (5) to the left and right relative to the center bolt (10); a pair of left and right claw arms 20 slidably attached to the guide portion 2, extending in the same direction as the center protrusion 17 of the center bolt 10, and having claw portions 28 at their tips for engaging the object C to be extracted from the shaft B; an actuation wire 30 that passes through the tip portions of the left and right guide portions 2, is arranged so as to extend from the front surface to the rear surface of the center plate 1, and is provided so as to surround the periphery of the center plate 1; The operating wire 30 is characterized in that it is fixed to a wire mounting portion 24L provided on the front side of the center plate 1 of one claw arm 20L, and is fixed to a wire mounting portion 24R provided on the back side of the center plate 1 of the other claw arm 20R.

[0013] Claim 2 provides the gear puller A according to the present invention described in claim 1, A feature of the present invention is that a movement assisting member 40 for assisting the movement of the operating wire 30 is provided at the tip end portion of the left and right guide portions 2.

[0014] Claim 3 provides the gear puller A according to the present invention described in claim 2, The movement assisting member 40 is characterized by being composed of a rotating top 41 that rotates in the movement direction of the operating wire 30, or an arc-shaped guide groove 45 that is arranged along the movement direction of the operating wire 30 and along which the operating wire 30 slides.

[0015] Claim 4 provides the gear puller A according to the present invention as set forth in claim 3, The radius R of the rotating top 41 or the arc-shaped guide groove 45 is smaller than the front-rear width W from the center line CL of the center plate 1 in the front-rear width direction to the wire attachment portion 24 of the operating wire 30.

[0016] Claim 5 provides the gear puller A according to the present invention as set forth in claim 1 or 2, The front-to-back width S from the front to the back of the female screw portion 5 of the center plate 1 is formed to be larger than the front-to-back width 2W of the operating wire 30 passing through the front and back of the center plate 1, and a recess 5m through which the operating wire 30 passes is recessed in the front and back of the female screw portion 5.

[0017] Claim 6 provides the gear puller A according to the present invention as set forth in claim 1 or 2, The claw arms 20 are characterized by being provided with locking members 50 for fixing the claw arms 20 to the guide portions 2, respectively. [Effects of the Invention]

[0018] In the gear puller A of the present invention, the claw arms 20 are moved open and closed by an equal distance in the left and right directions around the center bolt 10 in a manner linked by a single operating wire 30, which simplifies the opening and closing mechanism. As a result, the gear puller A can be made significantly smaller and lighter than conventional examples, and the removal work can be easily performed by one person. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a front view of an embodiment of the present invention. [Figure 2] FIG. 2 is a plan view of FIG. [Figure 3] FIG. 2 is a right side view of FIG. [Figure 4] 2 is a cross-sectional view taken along the line XX in FIG. 1. [Figure 5] FIG. 2 is a cross-sectional view of FIG. 1 taken along the line Y-Y. [Figure 6] FIG. 2 is a partial cross-sectional view of FIG. [Figure 7] FIG. 10 is a partially enlarged plan view of the mounting portion of the rotating top that guides the operating wire. [Figure 8] FIG. 8 is a vertical cross-sectional view of the rotating top mounting portion of FIG. 7. [Figure 9] FIG. 1 is an exploded view of the present invention. [Figure 10] FIG. 2 is an exploded perspective view of the claw arm and the rotating top portion of the present invention. [Figure 11] FIG. 10 is a partially enlarged cross-sectional view of an arc-shaped guide groove that guides an operating wire. [Figure 12] FIG. 12 is a right side view of FIG. [Figure 13] 10 shows a modified example of passageways provided in the rear and front portions of the fuselage. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, an embodiment of a gear puller A according to the present invention will be described with reference to the drawings. The gear puller A according to the present invention is composed of a center plate 1, a center bolt 10, a pair of left and right claw arms 20, an actuating wire 30, and a pair of left and right locking members 50. As can be seen from Fig. 1, the gear puller A is symmetrical about the center bolt 10, so when it is necessary to distinguish between the left and right, the reference numerals on the right side as viewed from above are marked with an R and the reference numerals on the left side as viewed from above. As can be seen from Fig. 2, the claw arms 20 are symmetrical about the center plate as viewed from the front to the rear, so when it is necessary to distinguish between the front and rear, the reference numerals on the lower side (front side) as viewed from above in the plan view of Fig. 2 are marked with an F and the reference numerals on the upper side (rear side) as viewed from above.

[0021] The center bolt 10 is a round bar-shaped member, and is divided into a rotation operation head 11 provided at the head of the center bolt 10 and a shaft portion 15. The rotation operation head 11 has an outer circumferential surface formed in a hexagonal shape so that a rotation drive tool 60 such as a hexagonal wrench or hexagonal spanner can be fitted therein. The shaft portion 15 is a rod-shaped portion with a male thread formed on its entire outer periphery. A protrusion is formed at the tip of the shaft portion 15. This protrusion is a center protrusion 17 that fits into the center hole of the shaft B, abuts against the end face of the shaft B, and aligns the shaft center.

[0022] The center plate 1 is a rod-shaped member that is formed by a female screw portion 5 having a female screw hole 5a formed in the center, and guide portions 2 that extend in the left-right direction from both sides of the female screw portion 5. 5, the longitudinal cross section of the guide portion 2 is formed in an inverted T shape, and the wide portion bulging out in the front and rear on the underside is the guide rail 3. The shaft portion 15 of the center bolt 10 is threaded into the female screw hole 5a of the female screw portion 5 so as to be able to thread forward and backward.

[0023] A movement assisting member 40 that guides the actuation wire 30 is provided at the tip of the guide section 2. Any type of movement assisting member 40 may be used as long as it can smoothly guide the actuation wire 30 so that it can move without resistance, but here a rotating top 41 or an arc-shaped guide groove 45 is used as the movement assisting member 40 for guiding the actuation wire 30. Below, the rotating top 41 (see Figure 10) will be described as a representative example, and the arc-shaped guide groove 45 will be described later as a modified example (see Figures 11 and 12).

[0024] When the movement assisting member 40 is a rotating top 41, as shown in Figure 10, rectangular grooves 4 that open horizontally directly above the guide rail 3 are provided at both tip portions of the guide part 2, and a rotating shaft support hole 4h that passes vertically through the center of this groove 4 is drilled at the tip portion. The rotating top 41 is a low, cylindrical piece with a guide groove 41a formed around its entire circumference for guiding the actuating wire 30 and a rotation hole 41h drilled in the center. As shown in Figures 7 and 8, the rotating tops 41 are fitted into the grooves 4 formed at the tip of the guide part 2, and are rotatably attached to the rotating shaft 6 inserted into the rotating shaft support hole 4h drilled vertically at the tip of the guide part 2.

[0025] 2 and 7, the front-to-rear width S from the front to the back of the female screw portion 5 of the center plate 1 is larger than the front-to-rear width 2W of the actuating wire 30 (the width between the actuating wire 30 on the front side and the actuating wire 30 on the back side), which will be described later. Therefore, to avoid interference with the actuating wire 30, a large relief groove 5m is provided on the front and back sides of the female screw portion 5, recessed along the path of the actuating wire 30. This relief groove 5m also serves to protect the actuating wire 30 wound around the outer periphery of the center plate 1.

[0026] The claw arm 20 is bilaterally symmetrical and is composed of a mounting body 21 and an arm 26 . As shown in Figs. 9 and 10, the attachment body 21 is made up of a front body portion 21F split into two halves, and a rear body portion 21B shaped symmetrically thereto.

[0027] Rail grooves 22F and 22B are provided in the upper inner surfaces of the front and rear torso sections 21F and 21B, respectively, and vertical upper arm storage grooves 23F and 23B are dug in the lower inner surfaces of the front and rear torso sections 21F and 21B, extending from the rail grooves 22F and 22B to the lower ends of the front and rear torso sections 21F and 21B. The guide rails 3 of the center plate 1 are sandwiched from the front and rear by the rail grooves 22F and 22B, and the upper parts of the arms 26 are sandwiched and held between the upper arm storage grooves 23F of the front torso section 21F and the upper arm storage grooves 23B of the rear torso section 21B. The front torso section 21F and the rear torso section 21B are fixed to the guide rails 3 by locking members 50, which will be described later.

[0028] Above the rail grooves 22F and 22B of the front torso section 21F and the rear torso section 21B, a passage 21h is formed, which serves as a passage for the actuating wire 30 that is installed parallel to the rail grooves 22F and 22B. The passage 21h penetrates from the right side surface to the left side surface of the front torso section 21F and the rear torso section 21B. In FIG. 10, the passage 21h is a through-hole that passes laterally through the upper portion of the front body portion 21F and the rear body portion 21B, but of course it is not limited to this and may be a recessed groove as shown in FIG. 13. Here, a through-hole is used as a representative example of the passage 21h. The hole diameter of this passage 21h is slightly more than twice the diameter of the actuating wire 30. (When the passage 21h is a recessed groove, the groove width is slightly more than the diameter of the actuating wire 30, and the actuating wire 30 is fixed with a set screw 21t.)

[0029] One or more screw holes 21n are provided in the front body part 21F of one claw arm 20L, leading from the upper surface thereof to the passage 21h, and set screws 21t are screwed in. This part is one wire attachment part 24L (FIGS. 1 and 2). The rear body portion 21B of the other claw arm 20R has one or more screw holes 21n formed in its upper surface to the passage 21h, into which set screws 21t are threaded. This portion is one wire attachment portion 24R. As will be described later, the operating wire 30 is locked to the wire attachment portions 24L and 24R by the set screws 21t. In contrast, no screw holes are provided in the rear body portion 21B of one claw arm 20L and the front body portion 21F of the other claw arm 20R, and the operating wire 30 moves within a passage 21h (FIG. 2).

[0030] As described above, upper arm storage grooves 23F and 23B are formed on the inner surfaces of front and rear body portions 21F and 21B below rail grooves 22F and 22B in the vertical direction and open to the underside of mounting body 21. A rotation prevention hole 23c for a tightening screw 55 of a locking member 50 (described later) is drilled in alignment with the upper arm storage groove 23B in the rear body section 21B, and a support pin loose-fitting hole 23d into which a support pin 25 is loosely fitted is drilled below the rotation prevention hole 23c. The rotation prevention hole 23c is an irregularly shaped hole, such as a square hole. (Of course, the rotation prevention hole 23c does not have to be an irregularly shaped hole, and may simply be a round hole in which the tightening screw 55 is fixed from the side with a set screw.) On the other hand, a fastening screw insertion hole 23g is drilled in line with the upper arm storage groove 23F of the front body part 21F, into which the male screw foot 58 of the fastening screw 55 of the locking member 50 described later is inserted, and a support pin loose fitting hole 23h is drilled below the fastening screw insertion hole 23g, into which the protruding portion of the support pin 25 is loosely fitted.

[0031] The arm portion 26 is composed of an arm body 27 and a claw portion 28. The arm body 27 is a rod-shaped portion with a rectangular cross section, and the claw portion 28 is provided at the lower end facing inward, giving the arm body 27 an overall L-shape or inverted L-shape. (The orientation of the claw portion 28 can be reversed outward by interchanging the left and right arm portions 26. This allows the claw portion 28 to engage with the inner peripheral edge of the object C to be extracted and extract it (not shown).) A fastening screw insertion hole 27k is formed in the upper part of the arm body 27, into which the male screw foot 58 of the fastening screw 55 of the locking member 50 is inserted, and a support pin fixing hole 27h is formed in the lower part thereof, into which a support pin 25 for supporting the arm part 26 is fixed. The support pin 25 is press-fitted or screw-fixed into this support pin fixing hole 27h, and protrudes forward and backward from the fixing hole 27h.

[0032] The upper arm storage grooves 23F and 23B of the front torso section 21F and the rear torso section 21B are fitted into the upper part of the arm main body 27 from the front and rear, respectively, and the protruding portions of the support pins 25 are loosely fitted into the support pin loose-fitting holes 23h and 23d of the front torso section 21F and the rear torso section 21B, and are inserted so as to be movable in the insertion / removal direction and the rotational direction.

[0033] The locking member 50 is composed of a claw fixing knob 51 and a tightening screw 55. The claw fixing knob 51 is composed of a handle 52 and a protrusion 53 protruding from the inner surface of the handle 52, and has a female screw hole 54 that opens on the inner surface of the protrusion 53 and is threaded toward the outer surface of the handle 52.

[0034] The tightening screw 55 is composed of a hemispherical head 56, a detent base 57 with an irregular cross section (square in the drawing) provided on the flat part of the head 56, and a male screw foot 58 protruding from the detent base 57. The fastening screw 55 passes from the anti-rotation hole 23c with an irregular cross section (square in the drawing) in the rear body 21B, through the fastening screw insertion hole 27k in the arm body 27, and into the round fastening screw insertion hole 23g in the front body 21F, and is screwed into the female threaded hole 54 for leg fixation of the claw fixing knob 51 via the spring washer 59. The locking base 57 of the fastening screw 55 is fitted into the locking hole 23c of the rear body portion 21B, so that the rotation of the fastening screw 55 is restricted.

[0035] Since the locking member 50 is fastened so that the halves of the front and rear torso sections 21F and 21B sandwich the guide rail 3 from the front and rear and fix the claw arm 20 to the guide section 2, the total depth of the upper arm storage grooves 23F and 23B dug into the inner surfaces of the front and rear torso sections 21F and 21B is smaller than the front-to-back width of the arm body 27, and a gap H is provided between the inner surfaces of the front and rear torso sections 21F and 21B when fastened (FIG. 8).

[0036] 1 and 2, the actuation wire 30 is inserted into the passage 21h of the front body part 21F of the left claw arm 20L in FIG. 1, fitted into the guide groove 41a of the rotating top 41 rotatably mounted at the tip of the left guide part 2L, goes around to the back surface of the center plate 1, is inserted into the passage 21h of the rear body part 21B of the left claw arm 20L, passes through the relief groove 5m on the back surface side of the female screw part 5 of the center plate 1, and is inserted into the right claw arm 20 The operating wire 30 is inserted into the passage 21h of the rear body part 21B of the right claw arm 20R, fitted into the guide groove 41a of the rotating top 41 rotatably attached to the tip of the right guide part 2R, turns to the front surface of the center plate 1, is inserted into the passage 21h of the front body part 21F of the right claw arm 20R, passes through the relief groove 5m on the front side of the female screw part 5 of the center plate 1, goes around the center plate 1 and is inserted into the passage 21h of the front body part 21F of the left claw arm 20L. The operating wire 30 is inserted in the passage 21h of the front body part 21F of the left claw arm 20L in an overlapping manner.

[0037] A set screw 21t is threaded into the wire attachment portions 24L and 24R of the front body portion 21F of the left claw arm 20L and the rear body portion 21B of the right claw arm 20R, and the actuating wire 30 is fixed integrally to the front body portion 21F of the left claw arm 20L and the rear body portion 21B of the right claw arm 20R by the set screw 21t. On the other hand, the rear body portion 21B of the left claw arm 20L and the front body portion 21F of the right claw arm 20R do not use a set screw 21t, and the actuating wire 30 moves freely through these passages 21h.

[0038] The relationship between the movement assist member 40 and the passage 21h will now be described with reference to FIGS. 7 and 8. The radius of the guide groove 41a of the movement assist member 40 (here, the rotating top 41) is R. The width from the center line CL in the front-to-rear width direction of the center plate 1 to the center of the passage 21h of the wire attachment portion 24 is W. In this embodiment, the width W is greater than the radius R (width W > radius R). The operating wire 30 is inclined in a direction widening relative to the guide portion 2 from the point where it leaves the guide groove 41a of the movement assist member 40 (the rotating top 41) to the entrance of the passage 21h. This makes the length of the operating wire 30 longer than when it is routed in a straight line between the left and right rotating tops 41, creating a margin of error for the inclination of the operating wire 30. As a result, no unnecessary tension is generated in the operating wire 30, enabling smooth opening and closing of the left and right claw arms 20L and 20R. In other words, if the operating wire 30 is stretched in a straight line between the left and right rotating tops 41 as described above, unnecessary tension will be generated in the operating wire 30, making it difficult for the rotating tops 41 to rotate (if the movement assist member 40 has an arc-shaped guide groove 45, the operating wire 30 will be difficult to slide), and the left and right claw arms 20L and 20R will not be able to open and close smoothly.

[0039] According to the above configuration, the gear puller A of the present invention allows a single person to easily remove an object C (gear or pulley) to be pulled from a shaft B, similar to a conventional gear puller. First, loosen the locking members 50L and 50R of the left and right claw arms 20L and 20R so that the left and right claw arms 20L and 20R can slide open and close freely along the guide rails 3L and 3R. Next, turn the center bolt 10 and screw it back sufficiently relative to the thickness of the object C to be extracted.

[0040] In this state, one of the claw arms 20L is moved outward with one hand. The operating wire 30 is fixed to the front body portion 21F of this one claw arm 20L, and the operating wire 30, which is wound around the center plate 1, is fixed to the rear body portion 21B of the other claw arm 20R. Therefore, as one claw arm 20L moves outward, the other claw arm 20R is also pulled by the operating wire 30 and moves an equal distance outward. When the distance between the left and right claw portions 28L and 28R becomes larger than the diameter of the object C to be pulled, the gear puller A is set so that it straddles the object C to be pulled.

[0041] Next, the left and right claw arms 20L, 20R are closed evenly to match the diameter of the object to be extracted C, and the left and right claw portions 28L, 28R are engaged with the outer periphery underside of the object to be extracted C. The left and right claw arms 20L, 20R are moved equal distances in the closing direction by the operating wire 30, so when the left and right claw portions 28L, 28R are engaged with the outer periphery underside of the object to be extracted C, the center bolt 10 is automatically aligned with the shaft B. In this state, the center bolt 10 is turned and threaded forward until the center protrusion 17 at the tip is fitted into the center hole of the shaft B. When the gear puller A is set to this state, the left and right locking members 50 are tightened to clamp and fix the mounting body 21 to the guide rail 3, and also fix the arm 26 to the mounting body 21. At the same time, the upper part of the arm 26 is also clamped and fixed to the mounting body 21. As a result, the center plate 1 and the left and right claw arms 20L and 20R are integrated together.

[0042] Next, a rotary operating tool 60 such as a hex wrench or wrench is fitted into the rotary operating head 11 of the center bolt 10, and this is rotated to further thread the center bolt 10. As the center bolt 10 threads in, the left and right claw arms 20 are pulled up evenly together with the center plate 1, and the object C to be extracted is extracted from the shaft B. During this time, the center projection 17 of the center bolt 10 ensures that the axes of the center bolt 10 and shaft B are aligned, so the center bolt 10 does not shift from the shaft B, and the claw portions 28 of the left and right claw arms 20 do not come off the object C to be extracted.

[0043] When the extraction of the object C is completed, it is removed from the gear puller A, and the gear puller A is stored in a predetermined location. The operating wire 30 of the gear puller A of the present invention is exposed to the outside from the start of operation until storage, but at the female screw portion 5, which is the thickest part of the center plate 1, it fits into the relief groove 5m so it does not come into contact with obstacles during operation, and between the female screw portion 5 and the rotating top 41 it extends along the wide guide rail 3 so it has almost no opportunity to come into contact with obstacles, and despite being a thin wire, it is not damaged. Even if it is damaged, it can be quickly replaced by loosening the set screw 21t, so it does not interfere with operation. The above operation can be easily performed by one person because the gear puller A uses the operating wire 30 and is lightweight and small.

[0044] 11 and 12 show another example of the movement assist member 40, in which the open end of the kerf 4 is formed into a convex arc shape instead of the rotating top 41. The radius is R as above. The convex arc surface of the kerf 4 is formed into a smooth surface, and the operating wire 30 slides on this surface.

[0045] Figure 13 shows another example of the passage 21h through which the actuating wire 30 passes, in which the passage 21h is formed by a groove dug from the front side of the front torso portion 21F toward the back side, and a groove dug from the back side of the rear torso portion 21B toward the front side, instead of a through hole. [Explanation of symbols]

[0046] A: Gear puller, B: Shaft, C: Pulling object, CL: Center line, H: Gap, R: Radius of rotating top (arc-shaped guide groove), Width S: Female thread portion, W: Width from center line to wire mounting portion, 2W: Front-to-rear width of operating wire, 1: Center plate, 2 (2L·2R): Guide portion, 3 (3L·3R): Guide rail, 4: Knot, 4h: Rotating shaft support hole, 5: Female thread portion, 5a: Female thread hole, 5m: Relief groove, 6: Rotating shaft, 10: Center bolt, 11: Rotating operation head, 15: Shaft portion, 17: Center protrusion, 20 (20L·20R): Claw arm, 21: Mounting body portion, 21B: Rear body portion, 21F: Front body portion, 21h: Passageway, 21n: Screw hole, 21t: Set screw, 22B·22F: Rail groove , 23B-23F: upper arm storage groove, 23c: anti-rotation hole, 23d: support pin loose-fitting hole, 23g: fastening screw insertion hole, 23h: support pin loose-fitting hole, 24 (24L-24R): wire attachment portion, 25: support pin, 26: arm portion, 27: arm body, 27h: support pin fixing hole, 27k: fastening screw insertion hole, 28: claw portion, 30: actuation wire, 40: movement auxiliary member, 41: rotating top, 41a: guide groove, 41h: rotation hole, 45: arc-shaped guide groove, 50 (50L-50R): locking member, 51: claw fixing knob, 52: handle, 53: protrusion, 54: female screw hole, 55: fastening screw, 56: head, 57: anti-rotation base, 58: male screw foot, 59: spring washer, 60: rotary drive tool

Claims

1. a center bolt (10) having a rotary operation head (11) at one end, a shaft portion (15) connected to the rotary operation head (11) with a male screw thread on the outer periphery thereof, and a center protrusion (17) at the other end that abuts against the end face of a shaft (B) on which an object (C) to be extracted is fitted; a center plate (1) including a female screw portion (5) into which the center bolt (10) is threadably inserted, and guide portions (2) extending from the female screw portion (5) to the left and right relative to the center bolt (10); a pair of left and right claw arms 20 slidably attached to the guide portion 2, extending in the same direction as the center protrusion 17 of the center bolt 10, and having claw portions 28 at their tips for engaging the object C to be extracted from the shaft B; an operating wire 30 that passes through the tip portions of the left and right guide portions 2, is arranged so as to extend from the front surface to the rear surface of the center plate 1, and is provided so as to surround the periphery of the center plate 1; A gear puller characterized in that the operating wire 30 is fixed to a wire mounting portion 24L provided on the front side of the center plate 1 of one claw arm 20L, and is fixed to a wire mounting portion 24R provided on the back side of the center plate 1 of the other claw arm 20R.

2. 2. The gear puller according to claim 1, wherein a movement assisting member is provided at the tip of each of the left and right guide portions to assist the movement of the operating wire.

3. The gear puller of the present invention as described in claim 2, characterized in that the movement assist member 40 is composed of a rotating top 41 that rotates in the movement direction of the operating wire 30, or an arc-shaped guide groove 45 that is arranged along the movement direction of the operating wire 30 and along which the operating wire 30 slides.

4. A gear puller according to the present invention, as described in claim 3, characterized in that the radius R of the rotating top 41 or the arc-shaped guide groove 45 is formed smaller than the front-to-rear width W from the center line CL of the center plate 1 in the front-to-rear width direction to the wire mounting portion 24 of the operating wire 30.

5. 3. The gear puller according to claim 1, wherein the front-to-rear width S from the front to the rear of the female screw portion 5 of the center plate 1 is formed larger than the front-to-rear width 2W of the operating wire 30 passing through the front and rear of the center plate 1, and the front and rear of the female screw portion 5 are recessed with relief grooves 5m through which the operating wire 30 passes.

6. 3. The gear puller according to claim 1, wherein the claw arms are provided with locking members for fixing the claw arms to the guide portions.

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