CHAIN ​​PULLEY HITCH

Abstract

A chain hoist (10) capable of moving a load upwards and downwards accompanied by a lifting and lowering operation, the chain hoist (10) comprising: a gear mechanism configured to transmit drive from a handwheel (20) to a first rotating body in a speed-increasing state; the first rotating body to which the rotation is transmitted from the gear mechanism in a high-speed rotation mode and in which a first tooth part (114a1) formed of a magnetic material and constituting a magnetic clutch mechanism is arranged in a circumferential direction; a second rotating body comprising a second tooth part (121a2) formed of a magnetic material capable of transmitting a rotational torque of a prescribed torque or more to / from the first tooth part (114a1) by magnetic attraction at a first position, and constituting the magnetic clutch mechanism in which the rotational torque to / from the first tooth part (114a1) by the magnetic attraction is smaller than the prescribed torque at a second position shifted from the first position in a thrust direction perpendicular to a rotational direction; a magnet (122) provided with at least one of the first rotating body and the second rotating body; a coupling pin (131) provided integrally with the second rotating body and formed of a magnetic material; and a coupling receiving member (140) formed of a non-magnetic material and comprising a plurality of recessed pockets configured to realize mechanical coupling by entry of the coupling pin (131) according to a displacement of the second rotary body, wherein the multiple pockets include: a lifting side pocket (141) into which the coupling pin (131) enters during lifting operation and in which a magnetic element (144) to which the coupling pin (131) is magnetically attracted is arranged; a lowering side pocket (142) into which the coupling pin (131) enters during lowering operation and in which a magnetic element (145) to which the coupling pin (131) is magnetically attracted; and an intermediate pocket (143) existing between the lifting side pocket (141) and the lowering side pocket (142) into which the coupling pin (131) enters in a state in which it is not magnetically attracted, wherein: a first tapered surface (141c) which inclines from an inner side of the lifting side pocket (141) toward a surface of the coupling receiving member (140) when the first tapered surface (141c) goes from the lifting side pocket (141) to the intermediate pocket (143) is provided between the lifting side pocket (141) and the intermediate pocket (143); a second tapered surface (142c) which slopes from an inner side of the lower side pocket (142) toward the surface of the coupling receiving member (140) as the second tapered surface (142c) passes from the lower side pocket (142) to the intermediate pocket (143) is provided between the lower side pocket (142) and the intermediate pocket (143); and the first tapered surface (141c) is provided to have a small angle of inclination with respect to the surface of the coupling receiving member (140) compared to the second tapered surface (142c).

Description

{Technical field}

[0001] The present invention relates to a chain hoist used for a work of unloading a transported material. {Technical background}

[0002] To move a load in the vertical direction, a manually operated chain hoist is widely used. Examples of the chain hoist include those disclosed in Patent Literatures 1 to 3. The chain hoists disclosed in Patent Literatures 1 to 3 each include a magnetic coupling device. During low-load and high-speed rotation, a magnetic coupling is established in which a tooth-shaped part of a magnetic pole rotating body and a tooth-shaped part of a yoke rotating body are closely opposed and rotate synchronously to transmit rotational torque.

[0003] On the other hand, in the case of a high load exceeding a predetermined load, the synchronous rotation is no longer maintained by the magnetic coupling of the tooth-shaped part of the magnetic pole rotating body and the tooth-shaped part of the yoke rotating body, and they slip. Then, an output rotating means integrally with the magnetic pole rotating body slides in an axial direction. Then, through the sliding, a coupling protrusion integral with the output rotating means fits into an engaging recess part of a high torque input means. In this way, it is made possible to perform switching between a low-load, high-speed rotation mode and a high-load, low-speed rotation mode.

[0004] Furthermore, US 2013 / 0200319 A1 (Patent Literature 4) discloses a pulley block with a built-in load-sensitive automatic speed change device comprising a high-torque input member coupled to a handwheel, a magnetic coupling coupled via a speed-increasing mechanism and configured to transmit a low load, and an output transmission means configured to transmit a rotational operating force of the handwheel to mechanical brakes via the high-torque input member or the magnetic coupling, wherein the handwheel is axially supported by a drive member coupled to the output transmission means of the mechanical brakes and rotated thereby, the magnetic coupling being arranged between the speed-increasing mechanism and the handwheel, wherein the handwheel and the speed-increasing mechanism are coupled via a hollow input member.which is provided so as to cover the outer periphery of the magnetic coupling, and wherein the output transmission means is fitted onto a hub portion of the drive element to enable torque transmission to the hub portion.,

[0005] US 2013 / 0206534 A1 (Patent Literature 5) discloses a load-sensitive magnetic coupling device comprising a magnetic pole rotating body having magnetic poles arranged on its circumference and a coupling projection of a claw clutch provided at one end thereof, a yoke rotating body configured to rotate about an axial rotation center identical to that of the magnetic pole rotating body, and a high-torque input device configured to rotate about the identical axial rotation center and having a clutch engaging portion engaged with the clutch projection, wherein the clutch projection is formed of a magnetic body, the clutch engaging portion comprises a clutch holding magnet body configured to attract the clutch projection by a magnetic force, and the clutch projection is engaged by applying a load torque,which exceeds a torque that can be transmitted between the magnetic pole rotating body and the yoke rotating body, is attracted by the clutch holding magnet body.

[0006] Furthermore, JP 2009-52619 A (Patent Literature 6) discloses a load-sensitive switching device that switches the output by rotating and linearly translating a driven disk, comprising a first magnet unit in which a magnet arranged in a first driven surface opposes another magnet arranged in a first working surface when the driven disk is in a high-load position, a second magnet unit in which a magnet arranged in a second driven surface opposes another magnet arranged in a second working surface when the driven disk is in a low-load position, and a third magnet unit in which a plurality of magnets of the same polarity are arranged in outer regions of the second working surface and the second driven surface. {Citation list} {PTL 1} JP 5 342 524 B2 {PTL 2} JP 5 231 498 B2 {PTL 3} JP 5 529 689 B2 {PTL 4} US 2013 / 0 200 319 A1 {PTL 5} US 2013 / 0 206 534 A1 {PTL 6} JP 2009- 52 619 A {Summary of the invention}{Technical problem}

[0007] Incidentally, in the case of manually operating the chain hoist to perform lifting by winding a load chain to move the load upwards and lowering by sending out the load chain to move the load downwards, the lowering and hoisting operations are not always performed at a constant speed and load at all times. In other words, since the operations of grasping an upper portion of a hand chain and sending the hand chain downwards and changing a holding position to grasp an upper portion of the hand chain and send the hand chain downwards are repeated, a large load acts intermittently in the above-mentioned lowering and hoisting operations.

[0008] Accordingly, even if the clutch protrusion enters the engaging recess portion under the high load acting when the hand chain is lowered, the clutch protrusion immediately comes out of the engaging recess portion at a low load time when the holding position of the hand chain is changed. Therefore, the clutch protrusion frequently comes out and enters the engaging recess portion, causing mechanical noise.

[0009] In order to prevent the occurrence of noise, in the configuration disclosed in Patent Literature 1, a clutch-holding magnetic body is fixed to the engagement recess part to form a configuration in which the clutch projection is magnetically held by the clutch-holding magnetic body. Note that in the configuration disclosed in Patent Literature 1, the clutch-holding magnetic body is fixed not only to the engagement recess part on the lifting side where the high load acts, but also to the engagement recess part on the lowering side, as in, for example, Fig. 7 illustrates how the clutch projection is magnetically held by the clutch-holding magnet bodies during both the lifting operation and the lowering operation.

[0010] When the load is light, the hand chain can be operated with the low-load, high-speed rotation mode switched from the high-load, low-speed rotation mode. In the configuration disclosed in Patent Literature 1, an inclined surface for disengagement is provided between a pair of engagement recess parts to perform such mode switching. In this case, by rotating a high-torque input means to the side opposite to the rotation direction up to that point, the clutch protrusion moves to the inclined surface for disengagement.

[0011] Here, when the tooth-shaped part of the magnetic pole rotating body and the tooth-shaped part of the yoke rotating body are located at the same angular position in the circumferential direction, the magnetic force acting between the tooth-shaped parts pushes an output rotating body (magnetic pole rotating body), causing the clutch projection to come out of the engagement recess part. This enables switching from the low-speed rotation mode to the high-speed rotation mode. However, in a slipping state where the rotations of the magnetic pole rotating body and the yoke rotating body are not synchronized, the tooth-shaped part of the magnetic pole rotating body and the tooth-shaped part of the yoke rotating body are often not located at the same angular position in the circumferential direction, and even if they are located at the same angular position, this situation is instantaneous.

[0012] Accordingly, even if the clutch protrusion moves along the disengagement inclined surface, the clutch protrusion is magnetically attracted to the clutch-holding magnet body of the engagement recess portion on the opposite side via the disengagement inclined surface. Therefore, a problem of failure to switch from the low-speed rotation mode to the high-speed rotation mode arises.

[0013] The present invention has been made in consideration of the above circumstances, and its object is to provide a chain hoist capable of smoothly switching from a low-speed rotation mode to a high-speed rotation mode. {Solution to the problem}

[0014] To solve the above problem, according to the present invention, there is provided a chain pulley block as defined in claim 1.

[0015] Further, in another aspect of the present invention, in the invention described above, it is preferable that locking walls to which the coupling pin is locked are provided at both end portions in the circumferential direction of the intermediate pocket, and the coupling pin is locked to the locking wall in a state that the coupling pin is prevented from coming out of the intermediate pocket upon rotation of the coupling receiving member.

[0016] Furthermore, in another aspect of the present invention, in the invention described above, it is preferable that an outer peripheral protrusion in a circular ring shape formed of a magnetic material is disposed adjacent to the first tooth part; and the intermediate pocket has a depth to an extent at which the outer peripheral protrusion and the second tooth part are magnetically coupled to each other.

[0017] According to the present invention, it is possible to easily perform switching from a low-speed rotation mode to a high-speed rotation mode in a chain pulley block. {Brief description of the drawings} { Fig. 1} is a sectional side view illustrating the configuration of a chain pulley according to a first embodiment of the present invention. { Fig. 2} is a perspective view showing the configurations of a handwheel and a planetary gear mechanism in the chain pulley block in Fig. 1, and is a view illustrating a state in which a swing support plate is detached from a lower support part of a cylindrical member. { Fig. 3} is a perspective view showing a half-section state of the configuration near a magnetic clutch mechanism and the handwheel in the chain pulley in Fig. 1 illustrates. { Fig. 4} is a perspective view of a state in which positions of an inner yoke rotating body and an outer yoke rotating body which control the magnetic clutch mechanism in the chain pulley block in Fig. 1 are shifted. { Fig. 5} is a sectional side view showing an enlarged configuration near the magnetic clutch mechanism in the chain pulley block in Fig. 1 illustrates. { Fig. 6} is a sectional side view illustrating a state in which an outer yoke rotating body is rotated in one direction (X1 side) from the Fig. 5 illustrated state is shifted. { Fig. 7} is a perspective view for explaining an engagement clutch mechanism in the chain pulley in Fig. 1 and is a view illustrating the outer yoke rotating body in a half section. { Fig. 8} is a sectional view showing a state of multiple pockets of a coupling receiving member in the chain pulley block in Fig. 1, cut along the circumferential direction. { Fig. 9} is a perspective view showing the configuration of the coupling receiving member in the chain pulley block in Fig. 1 illustrates. { Fig. 10} is a sectional view illustrating a state of a plurality of pockets cut along a circumferential direction in a conventional configuration. { Fig. 11} is a sectional view illustrating the configuration of a clutch receiving member according to a modification example. { Fig. 12} is a sectional view illustrating the configuration of a clutch receiving member according to another modification example. {Description of embodiments}

[0018] Hereinafter, a chain pulley block 10 according to an embodiment of the present invention will be explained based on the drawings. Note that in the following explanation, a right side in Fig. 1 is an X1 side (one side) and a left side is an X2 side (another side), and a side where a hand chain C1 hangs from a handwheel 20 is a Z2 side (lower side), and a side opposite thereto is a Z1 side (upper side).

[0019] Fig. 1 is a sectional side view illustrating the configuration of the chain pulley 10. The chain pulley 10 is suspended from a predetermined part of a ceiling or the like via an unillustrated upper hook. The chain pulley 10 comprises, as shown in Fig. 1 illustrates the handwheel 20 around which the hand chain C1 is wound, wherein the handwheel 20 is provided to be rotatable on an outer peripheral side of a drive shaft 30. The drive upon rotation of the handwheel 20 is transmitted to a brake mechanism 50 through a female screw member 40.

[0020] The driving force transmitted from the handwheel 20 to the female screw member 40 can be switched between a high-speed rotation mode in which the driving force is transmitted by means of a planetary gear mechanism 80 and a magnetic clutch mechanism, and a low-speed rotation mode in which the rotation of the handwheel 20 is transmitted to the female screw member 40 in a direct coupling state not by means of the planetary gear mechanism 80 and the magnetic clutch mechanism.

[0021] Furthermore, the driving force transmitted to the above-mentioned braking mechanism 50 is transmitted from the drive shaft 30 via a reduction gear mechanism 60 to a hollow load sheave shaft 70 located on the outer peripheral side of the drive shaft 30. A load chain C2 is fitted into a chain pocket 71 of the hollow load sheave shaft 70, and an unillustrated lower hook is coupled to a lower end side of the load chain C2. When the handwheel 20 is rotated in a lifting direction, the load chain C2 is wound up, thereby moving the load suspended by the lower hook upward. On the other hand, when the handwheel 20 is rotated in a lowering direction, the load chain C2 is fed, thereby moving the load suspended by the lower hook downward. The above is the schematic of the entire configuration of the chain hoist 10.

[0022] First, the configuration near the planetary gear mechanism 80 will be explained. Note that the planetary gear mechanism 80 corresponds to a gear mechanism. As shown in Fig. 1, the handwheel 20 is provided integrally with a cylindrical member 21 in a cylindrical shape. The cylindrical member 21 is a portion covering a magnetic clutch mechanism 100 explained later.

[0023] Fig. 2 is a perspective view illustrating the configurations of the handwheel 20 and the planetary gear mechanism 80, and is a view illustrating a state in which a swing support plate 22 is detached from a lower support part 21a of the cylindrical member 21. As in Fig. 2, on the lower support portion 21a of the cylindrical member 21, one end side of a rotating shaft of a planetary gear 81 constituting the planetary gear mechanism 80 is rotatably supported. Furthermore, on the lower support portion 21a, the pivot support plate 22 is fixed at a predetermined space therefrom. The pivot support plate 22 rotatably supports another end side of the rotating shaft of the planetary gear 81.

[0024] Furthermore, as in Fig. 1 and Fig. 2, the planetary gear mechanism 80 is arranged on a side portion of the cylindrical member 21. The planetary gear mechanism 80 transmits the rotation of the handwheel 20 and the cylindrical member 21 to an inner yoke rotating body 110 in a speed-increasing state. Note that the planetary gear mechanism 80 includes a sun gear part 112 (see Fig. 3) provided on the other side (X2 side) of an axial direction (X direction; a thrust direction) of the inner yoke rotating body 110, a plurality (three in Fig. 2) Planetary gears 81 arranged around the sun gear member 112 and meshing with the sun gear member 112, and a ring gear 82 fixed to a gear cover 11 and meshing with the planetary gear 81 on an outer radial side remote from the sun gear member 112. Further, the ring gear 82 fixed to the gear cover 11 and the cylindrical member 21 are provided to be slidable in a circumferential direction at a portion where they oppose each other. With this configuration, one end of the cylindrical member 21 is rotatably supported by the gear cover 11 via the ring gear 82. Further, the lower support part 21a of the cylindrical member 21 and the swing support plate 22 rotatably supporting the planetary gear 81 are rotatably supported to be rotatable together with the handwheel 20 through the same axial core with the center axis of the ring gear 82.

[0025] When the handwheel 20 is rotated in the high-speed rotation mode, its driving force is increased in speed by the planetary gear mechanism 80 and transmitted in the speed-increased state to a toothed hub 111 with the sun gear part 112 (see Fig. 3 and Fig. 4). In this case, for example, the ring gear 82 is fixed, and the planetary gear 81 rotates (rotates around the sun gear member 112) to rotate the sun gear member 112 in a speed-increased manner. On the other hand, in a state switched to the low-speed rotation mode, the inner yoke rotating body 110 is freely rotatable. Accordingly, in the state in which the later-explained coupling pins 131 (see Fig. 5 and so on) are not fitted into pockets 141, 142 (see Fig. 7 and so on), the inner yoke rotating body 110 is configured to rotate freely so that later-explained external tooth parts 114a1 and internal tooth parts 121a2 are located to face each other.

[0026] Fig. 3 is a perspective view illustrating a half-sectional state of the configuration near the magnetic clutch mechanism 100 and the handwheel 20. Fig. 4 is a perspective view of a state in which the positions of the inner yoke rotating body 110 and an outer yoke rotating body 120 constituting the magnetic clutch mechanism 100 are separated from each other. Fig. 5 is a sectional view illustrating an enlarged configuration near the magnetic clutch mechanism 100. Fig. 6 is a sectional side view illustrating a state in which the outer yoke rotating body 120 is rotated in one direction (X1 side) from the Fig. 5 illustrated state.

[0027] As in Fig. 3 and Fig. As illustrated in Figure 4, the magnetic clutch mechanism 100 includes the inner yoke rotating body 110 and the outer yoke rotating body 120 as main components. Note that the inner yoke rotating body 110 corresponds to a first rotating body, and the outer yoke rotating body 120 corresponds to a second rotating body.

[0028] The inner yoke rotating body 110 includes the toothed hub 111, a pair of external toothed yokes 114a, 114b, and an annular yoke 115. The toothed hub 111 is a member in which the sun gear part 112 and a hub part 113 are provided integrally. The sun gear part 112 meshes with the above-mentioned planetary gear 81 to be able to transmit the rotation from the planetary gear 81. Further, the hub part 113 includes a cylindrical part 113a and a flange part 113b, and the above-mentioned pair of external toothed yokes 114a, 114b and the annular yoke 115 are fixed to the flange part 113b, for example, via a screw or the like, on the outer peripheral side of the cylindrical part 113e. Thus, the toothed hub 111, the pair of external tooth yokes 114a, 114b and the ring yoke 115 are configured to rotate integrally.

[0029] The pair of external tooth yokes 114a, 114b and the annular yoke 115 are designed to increase the attractive force by the magnetic force and are made of a magnetic material. The pair of external tooth yokes 114a, 114b are provided with external tooth parts 114a1, 114b1 at regular intervals, and the external tooth parts 114a1, 114b1 protrude toward the outer peripheral side farther than the annular parts 114a2, 114b2. Note that the external tooth part 114a1 corresponds to a first tooth part, but both the external tooth part 114a1 and the external tooth part 114b1 may correspond to the first tooth part.

[0030] In the Fig. 3 and Fig. 4, the external tooth part 114a1 of the external tooth yoke 114a and the external tooth part 114b1 of the external tooth yoke 114b are provided in the same angular position in the circumferential direction. However, these external tooth parts 114a1, 114b1 may be in slightly different angular positions. Furthermore, in Fig. 4, eight external tooth parts 114a1, 114b1 are provided. However, the number of external tooth parts 114a1, 114b1 can be any other number.

[0031] Further, the annular yoke 115 is disposed between the pair of external tooth yokes 114a and 114b. In the annular yoke 115, there is an outer peripheral protrusion 115a that protrudes further than the annular portion on the outer diameter side, and the outer peripheral protrusion 115a is also provided in a ring shape without any interruption. Note that the outer peripheral protrusion 115a is provided to be closer to the external tooth yoke 114a than to the external tooth yoke 114b in the axial direction (X direction). Accordingly, the outer peripheral protrusion 115a can oppose an internal tooth portion 121a2 explained later.

[0032] Next, the outer yoke rotating body 120 is explained. As in Fig. 3 and Fig. 4, the outer yoke rotating body 120 includes a pair of internal tooth yokes 121a, 121b, a plurality of magnets 122, a sliding gear 123 (which also serves as a component of an engagement clutch mechanism 130 (see Fig. 4 and Fig. 6)) and the clutch pins 131 (components of the engagement clutch mechanism 130). Note that the pair of internal tooth yokes 121a, 121b, the plurality of magnets 122, and the clutch pins 131 are fixed to an outer peripheral fixing portion 123c of the sliding gear 123.

[0033] The pair of internal tooth yokes 121a, 121b are formed of a magnetic material and include circular ring portions 121a1, 121b1 in a ring shape and internal tooth portions 121a2, 121b2 projecting toward the inner diameter side from the circular ring portions 121a1, 121b1. The internal tooth portions 121a2, 121b2 are provided with the same pitch and in the same number as those of the external tooth portions 114a1, 114b1, and both of them are provided to closely oppose each other. As long as torque transmission can be successfully performed by magnetic coupling, the number of them may slightly increase or decrease from the same number due to the absence of any of the internal tooth portions 121a2, 121b2 and the external tooth portions 114a1, 114b1, or the like.Note that the internal tooth part 121a2 corresponds to a second tooth part, but both the internal tooth part 121a2 and the internal tooth part 121b2 may correspond to the second tooth part.

[0034] Furthermore, between the internal tooth yoke 121a and the internal tooth yoke 121b, a plurality of magnets 122 having magnetic force are arranged. In this embodiment, one magnet 122 is arranged for each set of the internal tooth yokes 121a, 121b. Thus, a magnetic circuit M1 can be easily formed for each set of internal tooth yokes 121a, 121b. Note that, instead of the configuration with the plurality of magnets 122, a configuration with a ring-shaped magnet may be used.

[0035] Here, in the high-speed rotation mode, the above-mentioned internal tooth parts 121a2 come into a magnetic coupling state in which they closely oppose the external tooth parts 114a1, and the internal tooth parts 121b2 similarly come into a magnetic coupling state in which they closely oppose the external tooth parts 114b1. Furthermore, the position in the axial direction (X direction) of the outer yoke rotating body 120 in the high-speed rotation mode corresponds to a first position. In this case, as shown in Fig. 5 illustrates the magnetic circuit M1 passing through the magnet 122, the internal tooth yoke 121a, the external tooth yoke 114a, the ring yoke 115, the external tooth yoke 114b, and the internal tooth yoke 121b. In the magnetic coupling state in which the magnetic circuit M1 is formed, the rotation can be transmitted from the external tooth yokes 114a, 114b (the inner yoke rotating body 110) to the internal tooth yokes 121a, 121b (the outer yoke rotating body 120).

[0036] However, when an overload is applied, the internal tooth parts 121a2, 121b2 can no longer maintain the magnetic coupling state with the external tooth parts 114a1, 114b1, respectively, resulting in the external tooth parts 114a1, 114b1 slipping with respect to the internal tooth parts 121a2, 121b2. In other words, the external tooth parts 114a1, 114b1 deviate from the internal tooth parts 121a2, 121b2 in the circumferential direction. In this case, the magnetic body of the inner yoke rotating body 110 that is closest in distance to the internal tooth yoke 121a is the ring body 115. Therefore, as shown in Fig. 6, the outer yoke rotating body 120 is shifted to be guided to one side (X1 side) in the axial direction (X direction), so that the internal tooth yoke 121a (the internal tooth part 121a2) and the outer peripheral protrusion 115a are closely opposed to each other. Note that the position in the axial direction (X direction) where the internal tooth yoke 121a (the internal tooth part 121a2) and the outer peripheral protrusion 115a are closely opposed to each other, as illustrated in FIG. 1, corresponds to a second position.

[0037] The slide gear 123 also includes a tubular part 123a, a disc part 123b, and the outer peripheral fixing part 123c. The tubular part 123a is spline-coupled therein to a tubular part 40a of the female screw member 40. Therefore, the slide gear 123 is slidable along the axial direction (X direction). The disc part 123b is a disc-shaped portion located between the tubular part 123a and the outer peripheral fixing part 123c. Further, the outer peripheral fixing part 123c is a portion located on the outermost diameter side of the slide gear 123 and is a portion that protrudes further than the disc part 123b to the other side (X2 side) in the axial direction (X direction). The above-mentioned pair of internal tooth yokes 121a, 121b, the plurality of magnets 122 and the coupling pins 131 are fixed to the outer peripheral fixing part 123c.Note that the sliding gear 123 also serves as the component of the engagement clutch mechanism 130.

[0038] Next, the engagement clutch mechanism 130 will be explained. Fig. 7 is a perspective view for explaining the engagement clutch mechanism 130 and is a view illustrating the outer yoke rotating body 120 in half section. The engagement clutch mechanism 130 includes the clutch pins 131 and a clutch receiving member 140. The clutch pins 131 are pin-shaped portions that protrude to one side (X1 side) in the axial direction (X direction) further than the disk part 123b of the sliding gear 123, and are formed of a magnetic material. Accordingly, the clutch pins 131 are magnetically attracted to the later-explained magnetic plates 144 by the magnetic force of the magnets 122.

[0039] The coupling pins 131 are portions that enter pockets 141, 142, 143 of the coupling receiving member 140. When the coupling pins 131 enter the pockets 141, 142, 143, the rotation of the handwheel 20 is transmitted from the coupling receiving member 140 to the sliding gear 123 of the outer yoke rotating body 120 via the coupling pins 131, not by means of the planetary gear mechanism 80 and the magnetic coupling mechanism 100. Then, the rotation is transmitted to the female screw member 40 via the tubular part 123a. In this embodiment, two coupling pins 131 are provided, and the number of coupling pins 131 is not particularly limited.

[0040] As in Fig. As illustrated in Fig. 7, the handwheel 20 is integrally mounted on the outer peripheral side of the clutch receiving member 140. Further, the clutch receiving member 140 is rotatably mounted on the outer peripheral side of the female screw member 40 via a bearing B1.

[0041] As in Fig. 7, the clutch receiving member 140 is provided in a disc shape. The clutch receiving member 140 is provided to be thin on its outermost peripheral side, and thereby is an outer peripheral flange part 140b protruding from a disc surface 140a (see Fig. 9).

[0042] The above-mentioned cylindrical member 21 is fixed to the outer peripheral flange portion 140b.

[0043] The clutch receiving member 140 is provided with the plurality of pockets 141, 142, 143 projecting from the disk surface 140a, which is a surface on the other side (X2 side) in the axial direction (X direction). Fig. 8 is a sectional view illustrating a state of the plurality of pockets 141, 142, 143 cut along the circumferential direction. Fig. 9 is a perspective view illustrating the configuration of the coupling receiving member 140. As shown in Fig. 8 and Fig. As illustrated in Fig. 9, the lifting side pockets 141 are portions into which the coupling pins 131 enter when the load chain C2 is hoisted. During the hoisting operation, the coupling receiving member 140 rotates together with the handwheel 20, and the rotation direction is counterclockwise (CCW) when the coupling receiving member 140 is viewed from a direction in which the plurality of pockets 141, 142, 143 are viewed. In this case, the coupling pins 131 are locked with the locking walls 141a (vertical to the plate surface 140a) along the axial direction (X direction). Thus, the rotation is transmitted from the coupling pins 131 to the coupling receiving member 140.

[0044] Furthermore, the magnetic plates 144 (corresponding to the magnetic elements) formed from the magnetic material are arranged within the lifting side pockets 141. As shown in Fig. 8, the magnetic plate 144 is mounted in a state of being fitted into a recessed fitting part 141b of the lifting side pocket 141. The magnetic plate 144 is provided to extend to a first tapered surface 141c on the side opposite to the locking wall 141a of the lifting side pocket 141.

[0045] The first tapered surface 141c is an inclined surface located between the magnetic plate 144 and the intermediate pocket 143 and inclines toward the disk surface 140a while extending from the magnetic plate 144 to the intermediate pocket 143.

[0046] Furthermore, the lowering side pockets 142 are portions into which the coupling pins 131 enter when the load chain C2 is lowered. More specifically, the lowering side pockets 142 are portions into which the coupling pins 131 enter when the load chain C2 is rotated in a direction opposite to that when the load chain C2 is raised. During the lowering operation, the coupling receiving member 140 rotates together with the handwheel 20, and the rotation direction is clockwise (CW direction) opposite to the counterclockwise (CCW direction) explained above. In this case, the coupling pins 131 are locked with locking walls 142a (vertical to the disk surface 140a) along the axial direction (X direction). Thus, the rotation from the coupling pins 131 is transmitted to the coupling receiving member 140.

[0047] Also disposed within the countersunk side pockets 142 are magnetic plates 145 (corresponding to the magnetic elements) formed of the magnetic material. The magnetic plate 145 is fixed in a state of being fitted into a recessed fitting part 142b of the countersunk side pocket 142. Further, the magnetic plate 145 is provided to extend to a second tapered surface 142c on the side opposite to the locking wall 142a of the countersunk side pocket 142. Note that the coupling pin 131 is magnetically attracted by the magnetic plate 144, 145, and a thin gap preferably exists between the coupling pin 131 and the magnetic plate 144, 145. When the thin gap exists, the friction between the coupling pin 131 and the magnetic plate 144, 145 is reduced.

[0048] The second tapered surface 142c is an inclined surface located between the magnetic plate 144 and the intermediate pocket 143 and inclines toward the disk surface 140a as it goes from the magnetic plate 145 to the intermediate pocket 143. As shown in Fig. However, as is apparent from Fig. 8, the second tapered surface 142c is provided to be larger in inclination angle than the first tapered surface 141c. In other words, the first tapered surface 141c is provided to have a smaller inclination angle than that of the second tapered surface 142c.

[0049] Specifically, when the inclination angle of the first tapered surface 141c is steep, when the handwheel 20 is rotated in the lowering direction from the raising state, the clutch pin 131 abuts the first tapered surface 141c by the rotation in the lowering direction (CW direction) of the clutch receiving member 140, but the clutch pin 131 does not subsequently slide on the first tapered surface 141c. To prevent such an unsuitable state, the inclination angle of the first tapered surface 141c is provided to be smaller than that of the second tapered surface 142c.

[0050] Note that in the Fig. 8, the first tapered surface 141c is inclined so that a projected length in the circumferential direction of the first tapered surface 141c is equal to or more than twice a projected length in the circumferential direction of the second tapered surface 142c. However, as long as the coupling pin 131 is capable of sequentially sliding on the first tapered surface 141c (capable of preventing the co-rotation of the coupling receiving member 140 and the coupling pin 131) when the coupling receiving member 140 is rotated in the downward direction (CW direction), the inclination angle can be any angle.

[0051] Furthermore, the intermediate pocket 143 is provided between the lifting side pocket 141 and the lowering side pocket 142. The intermediate pocket 143 is a portion provided to switch from the low-speed rotation mode to the high-speed rotation mode. The necessity of the intermediate pocket 143 is determined based on Fig. 10 explained.

[0052] Fig. Fig. 10 is a sectional view illustrating a state of a plurality of pockets 141H, 142H arranged along the circumferential direction in the conventional configuration shown in Fig. 7 of Patent Literature 1. In the Fig. 10, a configuration is given a symbol H that refers to a coupling receiving element 140H in the conventional configuration. Note that in the configuration shown in Fig. 10, the configuration corresponding to the intermediate pocket 143 does not exist. In the configuration shown in Fig. In the configuration illustrated in FIG. 10, when the clutch pin 131 enters a lifting side pocket 141H to rotate the handwheel 20 and the clutch receiving member 140 in the lifting direction (CCW direction), a direct clutch state is established in which the rotation of the handwheel 20 is transmitted from the clutch receiving member 140H to the sliding gear 123 of the outer yoke rotating body 120 via the clutch pin 131. In this case, the clutch pin 131 is in a state of being magnetically attracted to a magnetic plate 144H.

[0053] To release the magnetic attraction of the clutch pin 131 by the magnetic plate 144H, the handwheel 20 and the clutch receiving member 140H are rotated in the direction opposite to the lifting direction (CW direction). Then, the clutch pin 131 slides on a tapered surface 141Hc and rises above an intermediate projection 146H. In this case, the outer yoke rotating body 120 slides once to the other side (X2 side) in the axial direction (X direction). If the clutch pin 131 does not enter a countersunk side pocket 142H to perform switching to the high-speed rotation mode, there is no problem even if the rotation of the handwheel 20 and the clutch receiving member 140H continues in this state.

[0054] However, when the external tooth portion 114a1 of the external tooth yoke 114a and the internal tooth portion 121a2 of the internal tooth yoke 121a are not at the same angle in the circumferential direction, the outer peripheral protrusion 115a of the ring yoke 115 and the internal tooth portion 121a2 attract each other by the action of magnetism to enter a state of opposing each other. Thus, the outer yoke rotating body 120 moves again to one side (X1 side) in the axial direction (X direction), and this movement causes the coupling pin 131 to enter the countersunk side pocket 142H. Then, the coupling pin 131 is magnetically attracted to the magnetic plate 145.

[0055] In other words, in the Fig. 10, even if the handwheel 20 and the clutch receiving member 140H are rotated and the clutch pin 131 comes out of the lifting side pocket 141H, the clutch pin 131 again enters the lowering side pocket 142H.

[0056] In contrast to the above, in this embodiment, as shown in Fig. 8 and Fig. 9, the intermediate pocket 143 is provided between the lifting-side pocket 141 and the lowering-side pocket 142. The intermediate pocket 143 is a portion recessed from the disc surface 140a and the tapered surfaces 141c, 142c. Further, a locking wall 143a is provided at a counterclockwise end portion of the intermediate pocket 143, and a locking wall 143b is also provided at a clockwise end portion of the intermediate pocket 143.

[0057] Accordingly, when the handwheel 20 and the clutch receiving member 140 are rotated clockwise (CW direction) and the clutch pin 131 rises above the first tapered surface 141c, and further, when the outer peripheral protrusion 115a and the internal tooth portion 121a2 attract each other to come into a mutually abutting state, the clutch pin 131 enters the intermediate pocket 143. When the handwheel 20 and the clutch receiving member 140 are further rotated clockwise (CW direction) in this state, the clutch pin 131 is locked with the locking wall 143a, and the clutch pin 131 rotates together with the clutch receiving member 140.

[0058] However, no magnetic plate is disposed in the intermediate pocket 143. Accordingly, when the rotation of the handwheel 20 and the clutch receiving member 140 is stopped, the freely rotatable inner yoke rotating body 110 rotates in the circumferential direction, so that the internal tooth part 121a2 and the external tooth part 114a1 are located so as to be closely opposed to each other. Then, by the action of the magnetic force between the internal tooth part 121a2 and the external tooth part 114a1, the outer yoke rotating body 120 is moved in the thrust direction, so that the internal tooth part 121a2 and the external tooth part 114a1 are also located so as to be extremely closely opposed to each other in the axial direction.

[0059] Thus, the clutch pin 131 can come out of the intermediate pocket 143 to perform the switching to the high-speed rotation mode.

[0060] Note that, as explained above, when the clutch pin 131 comes out of the intermediate pocket 143, the internal tooth portion 121a2 and the external tooth portion 114a1 are closely opposed to each other in the circumferential direction. After that, unless an overload acts to release the state where the internal tooth portion 121a2 and the external tooth portion 114a1 are closely opposed to each other, the high-speed rotation mode is maintained.

[0061] Furthermore, in the event of an overload, the coupling pin 131 also enters the lowering position Fig. 8 and Fig. 9, and the clutch pin 131 is locked with the locking wall 142a. When the handwheel 20 and the clutch receiving member 140 are rotated counterclockwise (CCW) from this state, and the clutch pin 131 rises above the second tapered surface 142c, and the outer peripheral protrusion 115a and the internal tooth portion 121a2 attract each other to come into a mutually abutting state, the clutch pin 131 enters the intermediate pocket 143.

[0062] When the handwheel 20 and the clutch receiving member 140 are further rotated counterclockwise (CCW direction) in this state, the clutch pin 131 is locked with the locking wall 143b and the clutch pin 131 rotates together with the clutch receiving member 140.

[0063] Also in this case, when the rotation of the handwheel 20 and the clutch receiving member 140 is stopped, the freely rotatable inner yoke rotating body 110 rotates in the circumferential direction so that the internal tooth part 121a2 and the external tooth part 114a1 are located to be closely opposed to each other. Then, by the action of the magnetic force between the internal tooth part 121a2 and the external tooth part 114a1, the outer yoke rotating body 120 is moved in the thrust direction so that the internal tooth part 121a2 and the external tooth part 114a1 are located to be extremely closely opposed to each other in the axial direction. Thus, the clutch pin 131 can come out of the intermediate pocket 143 to perform switching to the high-speed rotation mode.

[0064] Note that the intermediate pocket 143 preferably has a depth to an extent where the outer peripheral protrusion 115a and the internal tooth portion 121a2 magnetically couple with each other. However, in order for the coupling pin 131 to successfully come out of the lifting side pocket 141, the intermediate pocket 143 may be provided with a depth smaller than that where the outer peripheral protrusion 115a and the internal tooth portion 121a2 magnetically couple with each other.

[0065] In the chain pulley block 10 having the above configuration, the lifting side pockets 141, into which the coupling pins 131 enter during the lifting operation and in which the magnetic plates 144 to which the coupling pins 131 are magnetically attracted are arranged, exist in the plurality of pockets formed in the coupling receiving member 140. Furthermore, the lowering side pockets 142, into which the coupling pins 131 enter during the lowering operation and in which the magnetic plates 145 to which the coupling pins 131 are magnetically attracted are arranged, exist in the plurality of pockets. Furthermore, the intermediate pockets 143, into which the coupling pins 131 enter in a state of not being magnetically attracted, exist between the lifting side pockets 141 and the lowering side pockets 142.

[0066] Accordingly, when the handwheel 20 is reversely rotated from the low-speed rotation mode to perform switching to the high-speed rotation mode in the hoisting operation, it is possible to prevent the clutch pins 131 from directly entering the lowering side pockets 142 from the hoisting side pockets 141 and cause the clutch pins 131 to enter the intermediate pockets 143. Since no magnetic plates are disposed in the intermediate pockets 143, the magnetic attraction force of the clutch pins 131 does not act. Accordingly, when the rotation of the handwheel 20 and the clutch receiving member 140 is stopped, the internal tooth parts 121a2 and the external tooth parts 114a1 are located to be very close to each other by the rotation in the circumferential direction of the freely rotatable inner yoke rotating body 110 and the movement in the thrust direction of the outer yoke rotating body 120.Thus, the clutch pins 131 can come out of the intermediate pockets 143 to perform the switching to the high-speed rotation mode.

[0067] Furthermore, in this embodiment, between the lifting-side pocket 141 and the intermediate pocket 143, the first tapered surface 141c is provided, which slopes from the inside of the lifting-side pocket 141 toward the surface of the clutch receiving member 140 as it goes from the lifting-side pocket 141 to the intermediate pocket 143. Further, between the sinking-side pocket 142 and the intermediate pocket 143, the second tapered surface 142c is provided, which slopes from the inside of the sinking-side pocket 142 toward the disk surface 140a of the clutch receiving member 140 as it goes from the sinking-side pocket 142 to the intermediate pocket 143. Furthermore, the first tapered surface 141c is provided to have a small inclination angle with respect to the surface of the clutch receiving member 140 compared to the second tapered surface 142c.

[0068] Here is in the Fig. 10, the load required when the handwheel 20 and the clutch receiving member 140H are rotated in the lowering direction (CW direction) from the lifting state where the clutch pin 131 is locked to the locking wall 141Ha is lighter than when they are rotated in the lifting direction (CCW direction). Although the load is light in this case, when the handwheel 20 and the clutch receiving member 140H are rotated in the lowering direction, the clutch pin 131 cannot rise above the first tapered surface 141Hc and may rotate in the same direction as the clutch receiving member 140H. In this case, the clutch pin 131 is magnetically attracted to the magnetic plate 144H again, and switching to the high-speed rotation mode is not successfully performed.

[0069] However, in this embodiment, since the first tapered surface 141c is provided to have a small inclination angle with respect to the surface of the clutch receiving member 140 compared with the second tapered surface 142c, the clutch pin 131 easily rises above the first tapered surface 141c. Therefore, it is possible to prevent the clutch pin 131 from being magnetically attracted to the magnetic plate 144 again, and switching to the high-speed rotation mode is smoothly performed.

[0070] Furthermore, in this embodiment, at both end portions in the circumferential direction of the intermediate pocket 143, the locking walls 143a, 143b to which the coupling pin 131 is locked are provided. Furthermore, upon rotation of the coupling receiving member 140, the coupling pin 131 is locked to the locking wall 143a, 143b in a state where the coupling pin 131 is prevented from coming out of the intermediate pocket 143.

[0071] Therefore, when the clutch pin 131 moving from the lifting-side pocket 141 enters the intermediate pocket 143, the clutch pin 131 can be prevented from moving to the lowering-side pocket 142 side. Similarly, when the clutch pin 131 moving from the lowering-side pocket 142 enters the intermediate pocket 143, the clutch pin 131 can be prevented from moving to the lifting-side pocket 141 side. Accordingly, when the rotation of the handwheel 20 and the clutch receiving member 140 is stopped, the clutch pin 131 can come out of the lowering-side pocket 142 by the action of the magnetic force to successfully perform the switching from the low-speed rotation mode to the high-speed rotation mode.

[0072] Further, in this embodiment, the outer peripheral protrusion 115a is arranged in a circular ring shape formed of the magnetic material adjacent to the external tooth portion 114a1, and the intermediate pocket 143 has a depth to an extent that the outer peripheral protrusion 115a and the internal tooth portion 121a2 magnetically couple with each other.

[0073] Therefore, when the coupling pin 131 enters an opening of the intermediate pocket 143 where the external tooth portion 114a1 of the external tooth yoke 114a and the internal tooth portion 121a2 of the internal tooth yoke 121a are not aligned to the same degree in the circumferential direction, the outer peripheral protrusion 115a of the ring yoke 115 and the internal tooth portion 121a2 can be configured to attract each other by the action of magnetism to come into a state of opposing each other. Accordingly, the coupling pin 131, which moves from the lifting-side pocket 141 to enter the intermediate pocket 143, can be prevented from moving to the lowering-side pocket 142. Similarly, the coupling pin 131, which moves from the lowering side pocket 142 to enter the intermediate pocket 143, can be prevented from moving to the lifting side pocket 141.Therefore, when the rotation of the handwheel 20 and the clutch receiving member 140 is stopped, the clutch pin 131 can come out of the countersunk side pocket 142 by the action of the magnetic force to successfully perform the switching from the low-speed rotation mode to the high-speed rotation mode. <modifikationsbeispiel>

[0074] The embodiment of the present invention has been explained above, but the present invention can be modified in various ways. Here, the modifications will be explained below.

[0075] In the above embodiment, the coupling receiving member 140 has a sectional shape as shown in Fig. 8. However, the coupling receiving element 140 may be formed in shapes as shown in the Fig. 11 and Fig. 12 are illustrated. Fig. 11 is a sectional view illustrating the configuration of a coupling receiving member 140 according to a modification example. Fig. In the configuration illustrated in Figure 11, the surface of the lifting side pocket 141 and the surface of the lowering side pocket 142 are located on the same plane (bottom surface 147). Furthermore, the intermediate pocket 143 can be provided so as to protrude from the bottom surface 147. Even this configuration makes it possible to successfully perform the switching from the low-speed rotation mode to the high-speed rotation mode.

[0076] Fig. Fig. 12 is a sectional view illustrating the configuration of a coupling receiving member 140 according to another modification example. For example, when the Fig. 11 is difficult to realize because the stroke of the coupling pin 131 cannot be sufficiently ensured or the like, the coupling receiving member 140 may be configured as shown in Fig. 12. In the Fig. 12, the lower portion of the lifting side pocket 141 forms an inclined surface 141d, so that when the coupling pin 131 passes through the inclined surface 141d, the coupling pin 131 enters the intermediate pocket 143. Note that, as shown in Fig. 12, the surface side of the magnetic plate 144 also forms the inclined surface 141d.

[0077] Similarly, the lower portion of the countersunk side pocket 142 forms an inclined surface 142d, so that when the coupling pin 131 passes through the inclined surface 142d, the coupling pin 131 enters the intermediate pocket 143. Here, the surface side of the magnetic plate 145 also forms the inclined surface 142d. Even this configuration makes it possible to successfully perform the switching from the low-speed rotation mode to the high-speed rotation mode.

[0078] Furthermore, the provision of the intermediate pocket 143 may be omitted as in the above embodiment. For example, a magnet having a magnetic pole opposing the magnetic pole of the coupling pin 131 may be installed at a position corresponding to the intermediate pocket 143. In this case, the coupling pin 131 comes into a state where it comes out of the intermediate pocket 143 by the magnetic force.

[0079] Furthermore, an element other than the magnetic plates 144, 145 may be arranged as the magnetic element.

[0080] For example, a magnetic powder may be supplied to the recessed fitting part 141b, and the magnetic powder may be solidified in the recessed fitting part 141b.

[0081] Furthermore, the inner yoke rotating body 110 corresponding to the first rotating body and the outer yoke rotating body 120 corresponding to the second rotating body are not limited to those in the above embodiment, but may be in another form. An example of the other form includes a configuration in which the first rotating body is located on the outer diameter side and the second rotating body is located on the inner diameter side. Furthermore, with regard to the rotation direction in the lifting operation, the handwheel 20 and the clutch receiving member 140 are rotated in the counterclockwise direction (CCW direction) in the above embodiment. However, in the lifting operation, the handwheel 20 and the clutch receiving member 140 may be rotated in a direction opposite thereto (CW direction). In this case, the arrangement of the lifting-side pocket 141 and the lowering-side pocket 142 is different from that in Fig. 8 illustrated arrangement is preferably symmetrical.

[0082] Furthermore, the configuration in which the magnets 122 are provided on the outer yoke rotating body 120 is used in the above embodiment. However, a configuration in which the magnets 122 are provided on the inner yoke rotating body 110 may be used, and a configuration in which the magnets 122 are provided on both the inner yoke rotating body 110 and the outer yoke rotating body 120 may be used. {Reference symbol list} 10 chain pulley, 11 wheel cover, 20 handwheel, 21 cylindrical element, 21a lower support part, 22 swivel support plate, 30 drive shaft, 40 female screw element, 40a tubular part, 50 brake mechanism, 60 reduction gear mechanism, 70 hollow load sheave shaft, 71 chain bag, 80 planetary gear mechanism (which corresponds to the gear mechanism), 81 planetary gears, 82 sprocket, 100 magnetic clutch mechanism, 110 inner yoke rotating body (which corresponds to the first rotating body), 111 toothed hub, 112 sun gear part, 113 hub part, 113a cylindrical part, 113b flange part, 114a, 114b external tooth yoke, 114a1, 114b1 external tooth part (corresponding to the first tooth part), 115 Ringjoch, 115a outer peripheral projection, 120 outer yoke rotating body (which corresponds to the second rotating body), 121a, 121b internal toothed yoke, 121a1, 121b1 circular ring part, 121a2, 121b2 internal tooth part (which corresponds to the second tooth part), 122 magnets, 123 sliding wheel, 123a tubular part, 123b disc part, 123c outer circumference fastening part, 130 engagement clutch mechanism, 131 coupling pin, 140, 140H coupling receiving element, 140a disc surface, 140b outer peripheral flange part, 141, 141H lifting side pocket (which corresponds to the pocket), 141a locking wall, 141b recessed fitting part, 141c first tapered surface, 141Hc tapered surface, 142, 142H drop side pocket, 142a locking wall, 142b recessed fitting part, 142c second tapered surface, 143 intermediate pocket, 143a, 143b locking walls, 144, 145 Magnetic plate (which corresponds to the magnetic element), 144h, 145H magnetic plate, 146H intermediate projection, 147 lower surface, B1 warehouse, C1 hand chain, C2 load chain, M1 magnetic circuit< / modifikationsbeispiel>

Claims

[1] Chain hoist (10) capable of moving a load upwards and downwards accompanied by a lifting and a lowering operation, the chain hoist (10) comprising: a gear mechanism configured to transmit drive from a handwheel (20) to a first rotating body in a speed-increasing state; the first rotating body to which the rotation is transmitted from the gear mechanism in a high-speed rotation mode and in which a first tooth part (114a1) formed of a magnetic material and constituting a magnetic clutch mechanism is arranged in a circumferential direction; a second rotating body comprising a second tooth part (121a2) formed of a magnetic material capable of transmitting a rotational torque of a prescribed torque or more to / from the first tooth part (114a1) by magnetic attraction at a first position, and constituting the magnetic clutch mechanism in which the rotational torque to / from the first tooth part (114a1) by the magnetic attraction is smaller than the prescribed torque at a second position shifted from the first position in a thrust direction perpendicular to a rotational direction; a magnet (122) provided with at least one of the first rotating body and the second rotating body; a coupling pin (131) provided integrally with the second rotating body and formed of a magnetic material; and a coupling receiving member (140) formed of a non-magnetic material and comprising a plurality of recessed pockets configured to realize mechanical coupling by entry of the coupling pin (131) according to a displacement of the second rotary body, wherein the multiple pockets include: a lifting side pocket (141) into which the coupling pin (131) enters during lifting operation and in which a magnetic element (144) to which the coupling pin (131) is magnetically attracted is arranged; a lowering side pocket (142) into which the coupling pin (131) enters during lowering operation and in which a magnetic element (145) to which the coupling pin (131) is magnetically attracted; and an intermediate pocket (143) existing between the lifting side pocket (141) and the lowering side pocket (142) into which the coupling pin (131) enters in a state in which it is not magnetically attracted, wherein: a first tapered surface (141c) which inclines from an inner side of the lifting side pocket (141) toward a surface of the coupling receiving member (140) when the first tapered surface (141c) goes from the lifting side pocket (141) to the intermediate pocket (143) is provided between the lifting side pocket (141) and the intermediate pocket (143); a second tapered surface (142c) which slopes from an inner side of the lower side pocket (142) toward the surface of the coupling receiving member (140) as the second tapered surface (142c) passes from the lower side pocket (142) to the intermediate pocket (143) is provided between the lower side pocket (142) and the intermediate pocket (143); and the first tapered surface (141c) is provided to have a small angle of inclination with respect to the surface of the coupling receiving member (140) compared to the second tapered surface (142c). [2] The chain pulley (10) according to claim 1, wherein locking walls (143a, 143b) to which the coupling pin (131) is locked are provided at both end portions in the circumferential direction of the intermediate pocket (143), and the coupling pin (131) is locked to the locking wall (143a, 143b) in a state in which the coupling pin (131) is prevented from coming out of the intermediate pocket (143) upon rotation of the coupling receiving member (140). [3] Chain pulley (10) according to one of claims 1 or 2, wherein: an outer peripheral protruding part (115a) in a circular ring shape formed of a magnetic material is arranged adjacent to the first tooth part (114a1); and the intermediate pocket (143) has a depth to an extent where the outer peripheral protrusion (115a) and the second tooth portion (121a2) are magnetically coupled to each other.

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