JP2537678B2 - Hoisting device - Google Patents

Description

The present invention relates to a hoisting device used for raising and lowering curtains, screens, blinds and the like.

[Conventional technology]

Conventionally, as a winding device of this kind, as shown in FIGS. 9 and 10, hoisting is performed by rotating a winding shaft (42) with a pulley (81) that is rotated by a ball chain (80) having a ring shape. There are known types of feeding operation.

Incidentally, in FIGS. 9 and 10, reference numerals (28) to (72)
The part indicated by is the same as that of the embodiment described later, and thus the detailed description will be omitted.

[Problems to be Solved by the Invention]

The winding device described in the above-mentioned prior art is configured such that the front side linear portion (82) of the ring-shaped ball chain (80) is suspended.
It was inconvenient because it was necessary to wind up or unwind with the operation of pulling back the straight line portion (83) of the rear side with one hand alternately with the other hand, that is, the operation with both hands.

It is an object of the present invention to provide a novel hoisting device that enables the hoisting operation and the feeding operation with one hand, and aims to solve the inconvenience.

[Means for solving the problem]

In order to achieve the above-mentioned object, the winding device of the present invention comprises a fixed shaft provided on a support shaft member in a non-rotatable and sideways state, a pulley rotatably supported by the fixed shaft, and an operating puller wound on the pulley. A state in which the string and the mainspring are interposed between the fixed shaft and the pulley as a state that stores the force when the pulling operation string is pulled down and releases the pulling operation when the pulling operation is released, and the state where the fixed shaft is surrounded by the side surface of the pulley. A ring-shaped prime mover and a ring whose one end is rotatably fitted on the outside of the ring-shaped prime mover and whose inner diameter is the same as the inner diameter of the ring-shaped prime mover. -Shaped driven body and a pulley cut inserted so that the outer peripheral surface of one end side portion is lightly pressed against the inner peripheral surface of the ring-shaped driven body and the outer peripheral surface of the other end side portion is lightly pressed against the inner peripheral surface of the ring-shaped driven body. On the release side coil spring and the fixed shaft A boss-shaped driving body that is fixed as non-rotatable, a boss-shaped driven body that is rotatably mounted at a position between the pulley separation side coil spring of the fixed shaft and the boss-shaped driving body, and an inner circumference of one end side portion. Provided on the boss-shaped driven body and the fixed-shaft disconnecting side coil spring, with the outer surface of the boss-shaped driven body facing the inner peripheral surface of the other end side of the boss-shaped driven body lightly pressed The engaging projection and the engaging fold provided at the end of the pulley disconnection side coil spring so as to enter the locus of the engaging projection.

〔Example〕

In the embodiment shown in the figure, a mounting member (3) having support shaft members (1) and (2) at both left and right ends is constructed, and a fixed shaft (4) is rotatably set on the inner surface of the left support shaft member (1). The pulley (5) is rotatably attached to the base end of the fixed shaft (4) and the recess (6) is formed around the shaft hole of the pulley (5).
The mainspring (7) is inserted into the recess (6), and the inner and outer ends of the mainspring (7) are fixed to the fixed shaft (4).
It is locked in the slit (8) and the notch (9) for hooking provided on the peripheral wall of the recess (6), and the operating string (10) is wound around the groove of the pulley (5). The inner end (10) 'is fastened to the pulley (5), the end stop (11) is also bound to the outer end, and the side of the pulley (5) surrounds the fixed shaft (4). A ring-shaped motive body (13) is integrally projected, and a ring-shaped driven body (14) longer than the ring-shaped motive body (13) is rotatably fitted on the outside of the ring-shaped motive body (13), and the ring is driven. The inner diameter of the ring-shaped driving body (13) and the inner diameter of the ring-shaped driving body (13) on the inner peripheral surface of the ring-shaped driving body (14) are the same, and these ring-shaped driving bodies (13), Pulley separating coil spring (15) wound in the ring-shaped driven body (14) with no gap between the wire rings
And the outer peripheral surface of the one end side portion of the coil spring (15) is connected to the inner peripheral surface of the ring-shaped driving body (13), and the outer peripheral surface of the other end side portion is connected to the inner peripheral surface of the ring-shaped driven body (14). The pulley disengagement clutch (16) is formed by lightly pressing each of them to the boss-shaped prime mover (19) with a collar (18) at the tip of the fixed shaft (4) so that it cannot be rotated. 20) and the boss-like driven body (22) with the collar (21) inside the boss-like driving body (19) on the fixed shaft (4).
Rotatably attached to the boss-shaped driving body (19) and the boss-shaped driven body (22), and fit the fixed shaft disconnecting side coil spring (23) wound around the wire ring with no gap. The inner peripheral surface of the one end side portion of the coil spring (23) is lightly attached to the outer peripheral surface of the boss-shaped driving body (19) and the inner peripheral surface of the other end side portion is lightly attached to the outer peripheral surface of the boss-shaped driven body (22). The fixed shaft disengagement clutch (24) is formed by pressure contact, and the flange (21) of the boss-shaped driven body (22) is extended to the other end side portion of the ring-shaped driven body (14). The boss-like driven body (22) is fitted in the inner part of the boss-like driven body (22) in a freely rotatable manner, and the engaging projection (25)
In the locus of the engaging protrusion (25), the engaging folding leg (26) is provided at the end existing in the ring-shaped driven body (14) in the pulley separation side coil spring (15). The hollow disk-shaped holding box (30) is provided with a bearing member (29) having a square shaft hole (28) on the inner surface of the right support shaft member (2).
A rotatably supported coil spring (31) is inserted between the outer circumference of the bearing member (29) and the inner circumference of the holding box (30) so that there is no gap between the wire rings. Then, the outer peripheral surface of the coil spring (31) is lightly brought into pressure contact with the inner peripheral surface of the holding box (30) and is engaged with one end of the coil spring (31) and the outer peripheral surface of the bearing member (29). 32) and the engagement notch (33) allows the curtain (4
4) Clutch (3) for cutting off the axis that prevents overwinding
4) and the square shaft (36) is formed in the square shaft hole (28).
A pair of hollow partition chambers (37) (38) axially aligned with the square shaft (36) by fitting the base ends of the non-rotatable and non-removable
A rotary drum (39) having a shaft is rotatably supported via metal (40) (41), and a pipe-shaped winding shaft (42) is provided between the rotary drum (39) and the ring-shaped driven body (14). The rotary drum (39) and the ring-shaped driven body (14) are non-rotatably fitted into both ends of the winding shaft (42) and the weight rod for the weight is provided on the outer edge of the winding shaft (42). Curtain with (43) (4
The inner edge of 4) is fixed and wound, and the square shaft (36)
In one of the hollow partition chambers (37), a fixed side rotary disc (46) is non-rotatably attached to a part existing in the hollow partition chamber (37), and a boss-shaped shaft (47) is integrally provided on the fixed side rotary disc (46). The movable side rotary disk (48) is rotatably supported on the shaft (47) by the C-washer (49) so that it cannot be removed and the movable side rotary disk (48) is non-rotatable in the one hollow partition chamber (37). The movable side rotary disc (48) is locked, and a circular orbital groove (50) is formed around the side surface facing the fixed side rotary disc (46).
A pair of arcuate recessed grooves (52) (52) 'having inner ends facing the center of the inner circumferential wall of the same circular groove (50) and having abutting walls (51) (51)' at the inner ends.
Is an S-shaped concave groove (53) which is continuous with the inner end side surface of each arc-shaped concave groove (52) (52) 'and whose outer end opens to the inner peripheral wall of the circular groove (50).
(53) 'are pierced so as to be symmetrically arranged, and the leading end of each of the arcuate recessed grooves (52) (52)' is provided with an introduction leaf spring (54) (54) 'at its tip end. (50) is attached in a curved state by pressing against the outer peripheral wall, and a recess (55) is formed in the outer peripheral surface of the stationary side turntable (46) to form the recess (55).
A piece (56) which slides in the centripetal direction is inserted therein, and the piece (56) is pushed outward between the inner surface of the piece (56) and the bottom surface of the recess (55). A spring (57) is sandwiched and a sideward projecting pin (58) is integrally provided on the side surface of the piece body (56), and the projecting pin (58) is provided on a side wall of the recess (55). (46) 'through the orbital groove (50), and when the movable side turntable (48) rotates toward the release side of the curtain (44), the protruding pin (58) causes the orbiting groove (50) to rotate. The leaf spring (5
4) When the tip of the (54) 'is pushed away, it simply moves, and when it rotates to the winding side of the curtain (44), the leaf spring (54)
(54) 'and guided through the arcuate groove (52) (52)' to S
Guide protrusions (59) (59) 'of the V-shaped groove (53) (53)'
When the movable side turntable (48) rotates to the release side after the engagement, the projecting pin (58) causes the protruding pin (58) to have the S-shaped groove (53).
The (53) 'is locked to the locking overhanging parts (60) (60)', and the S-shaped groove (53) (5) (5)
3) ′ is removed to return to the orbital groove (50), and a disc (61) is non-rotatably attached to a part of the square shaft (36) in the other hollow partition chamber (38). 6
Around the periphery of 1), a large number of small gears (62) are similarly mounted, and external gears (63) are rotatably mounted around the central shafts (64) (65), respectively, and on the other hand, the inner circumference of the hollow partition chamber (38). By providing an internal gear (66) on the surface, a planetary gear device for speed-up (67)
Forming the external gear (63) in this gear device (67)
An impeller-like part (68) is integrally provided on the side surface of the fan, and a fan-shaped weight body (71) is freely movable in each compartment (70) partitioned by the blades (69) and opening in the radial direction. The governor device is loaded, and the weights (71) are pushed outward by the centrifugal force, and on the other hand, the inner peripheral surface of the hollow partition chamber (38) is pressed and slid to brake the rotating drum (39) ( 72)
Is formed.

In the figure, (74) and (75) are auxiliary members forming the hollow partition chambers (37) and (38), (76) and (77) are rotation preventing recesses and protrusions, and (78) is a play preventing spring portion. Indicates.

The present invention may be carried out by inserting a bearing between the collar (21) of the boss-shaped driven body (22) and the ring-shaped driven body (14).

[Action]

The protruding pin (58) is locked to the locking projection (60) or (60) 'and the load of the weight rod (43) is ringed through the curtain (44) and the pipe-shaped winding shaft (42). Follower (14)
When the operation drawstring (10) is slightly pulled down while it is stopped by the rotating drum (39),
The pulley (5) and the ring-shaped prime mover (13) rotate in the direction opposite to the rotation of the hands of the clock in FIG. 4, and the inner peripheral surfaces of the pulley (5) and the ring-shaped prime mover (13) are cut by the pulley. The outer peripheral surface of the separation side coil spring (15) is strongly pressed, that is, the pulley (5), the ring-shaped driving body (13), the pulley separation-side coil (15), the ring-shaped driven body (14), and the pipe-shaped winding shaft (42). ), The rotary drum (39) and the movable side turntable (48) rotate in an integrated state, and the projecting pin (58) is disengaged from the locking projection (60) or (60) ′ and the circumferential groove. When the push pin (58) is moved to the orbital groove (50) and the pulling down force applied to the operation drawstring (10) is released, the weight rod (43) is moved. ), The curtain (44) begins to rotate in the lowering direction, and this lowering direction rotation causes the engaging folding leg (26) to engage with the engaging protrusion. 25), and by this collision, the fixed shaft disconnecting side coil spring (23) tightens the boss-shaped driven body (22) and the boss-shaped driving body (19) to stop the engaging broken leg (26). However, due to this stop, the outer diameter of the pulley disconnection side coil spring (15) contracts, and the pulley disconnection clutch (1
6) is turned off and the curtain (44) continues to rotate in the lowering direction. At this time, the rotary drum (39) rotates in the direction opposite to the rotation of the hands of the clock in FIG.
8) allows the curtain (44) to rotate in the lowering direction while allowing the introduction leaf springs (54) (54) 'to move in the orbiting groove (50) by pushing away from the tips thereof.
Along with the rotation of 9), the speed-up planetary gear device (67) operates to apply braking by the weight body (71) to the rotating drum (39), thereby adjusting the descending speed of the curtain (44).

In addition, the protruding pin (58) has the locking protrusion (60) or (6
0) ′ and receives the load of the weight rod (43) through the curtain (44) and the pipe-shaped winding shaft (42) on the ring-shaped driven body (14) and the rotary drum (39) and stops. When the pull string (10) for operation is pulled down a little longer than the above state, the projecting pin (58) moves to the orbital groove (50) as described above at the initial stage of the pulling down, and the pulling string (58) collides in the latter period. The pin (58) is guided by one of the introduction leaf springs (54) and another S
If the hand hits the abutting wall (51) to reach the character-shaped groove (53) and the hand is pulling the drawstring (10) for operation, it feels like a shock. When the pulling down force applied to the operation drawstring (10) is released by loosening, the lowering direction rotation of the curtain (44) starts at the same time as this loosening operation. Immediately after that, the bridge body (56) and the projecting pin (58), which are constantly subjected to the pressing force by the pressing spring (57), receive the S-shaped concave groove (53) ′ by the pressing force.
The locking protrusion (6) is inserted through the entry guide protrusion (59) '.
0) 'to stop the downward rotation of the curtain (44), the protruding pin (58) is locked to the locking overhanging portion (60) or (60)', and the weight rod ( The pull string for operation (10) in a state where the load of 43) is received by the ring driven body (14) and the rotating drum (39) through the curtain (44) and the pipe pipe winding shaft (42) and stopped. When it is pulled down further than the above, the projecting pin (58) initially moves to the orbital groove (50) as described above, and the projecting pin (58) is guided to one of the introducing leaf springs (54) 'in the middle period. Being hit against the abutment wall (51) ', the operation of pulling down the operation drawstring (10) continues regardless of having sensed the hit in the latter half of the curtain (44).
The pulling operation for pulling down the operating drawstring (10) is carried out mainly by the pulley (5).
Loosen the pulling hand at the place where it comes out, and simultaneously with this loosening operation, rotation of the curtain (44) in the lowering direction starts and the projecting pin (58) enters the S-shaped concave groove (53) and overhangs for guidance. The curtain (44) is stopped from rotating in the lowering direction by being locked to the locking overhanging part (60) via the part (59).

That is, the curtain can be lowered and lowered in small steps, continuously lowered and raised, small steps can be rolled up, and large steps can be rolled up depending on how to pull and pull out the operating drawstring (10).

That is, when the projecting pin (58) is located in the circumferential groove (50) or in the arcuate concave grooves (52) (52) ', the operation drawstring (10) is located.
The curtain (44) automatically lowers when it is loosened, and the curtain (44) when it loosens immediately after the abutment pin (58) abuts the abutting walls (51) (51) '. Of the curtain (58) by pulling down the operating drawstring (10) regardless of feeling that the projecting pin (58) collides with the abutting wall (51) (51) '. 44) can be rolled up. It should be noted that, at the time of this winding operation, since the pulling-down distance of the pulling cord (10) for operation is almost determined by the length of the human arm, it is necessary to repeatedly pull down the pulling string (10) for operation. However, at this time, it is necessary to have a minimum distance more than the pull-down distance until the protruding pin (58) abuts against the abutting wall.

At the time of pulling out the operation drawstring (10), power is stored in the mainspring (7) and the pulley (5) and the ring-shaped prime mover (13) rotate in the direction opposite to the hands of the clock in FIG. The inner peripheral surface of the rotating ring-shaped prime mover (13) and the outer peripheral surface of one end side portion of the pulley separation side coil spring (15) are non-slidably pressed into contact with each other to form the pulley (5) and the pulley separation side coil spring. The outer peripheral surface of the ring-shaped driven body (14) is formed by integrating the outer peripheral diameter of (15) and the outer peripheral surface of the other end side portion of the pulley separation side coil spring (15) having a larger outer peripheral diameter. The pulley disconnection side coil spring (15) and the ring-shaped driven body (14) are integrated with each other by press-fitting non-slipably, that is, the pull-out operation force of the operation drawstring (10) is applied to the pipe-shaped winding shaft (42). In the middle of this transmission while giving the winding force to the curtain (44) And the engaging folds (26) are engaged with the engaging protrusions (25) to transmit a part of the pulling-out operation force to the boss-like driven body (22), and receive the pulling-out operation force. (22) slips in the fixed shaft separation side coil spring (23) to separate the fixed shaft (4) from the ring-shaped driven body (14), and the pulley separation side coil spring (15) is ring-shaped driven. The ring-shaped driven body (14) is prevented from having a large outer diameter as the body (14) rotates and thereby impairing the smoothness and reliability of rotation of the ring-shaped driven body (14).

The projecting pin (58) applies the pulling down force applied to the operation drawstring (10) to the locking extension (60) or (6).
0) ′ and receives the load of the weight rod (43) through the curtain (44) and the pipe-shaped winding shaft (42) on the ring-shaped driven body (14) and the rotary drum (39) and stops. When released, the pulley (5) and ring-shaped prime mover (13) rotate in the same direction as the hands of the clock in FIG. 4 by the unwinding force of the mainspring (7), and this rotation causes the ring-shaped original to rotate. The moving body (13) and the outer peripheral surface of the one end side portion of the pulley separation side coil spring (15) are slidable to allow the ring-shaped driven body (14) and the pipe-shaped winding shaft (42) to rotate freely. During this rotation, the engaging folds (26) are engaged with the engaging projections (25) to transmit a part of the releasing force to the boss-like driven body (22), and the boss-like member receiving the releasing force. Of the outer peripheral surface of the driven body (22) and the outer peripheral surface of the boss-shaped driven body (19) and the fixed shaft separation side coil spring (23) Boss-like follower (22) and Kakarigooriashi (26) to a stopped state faces and is pressed against,
By this stop, the smoothness and reliability of the rotation state of the ring-shaped driven body (14) and the pipe-shaped winding shaft (42) and the rewinding of the operating drawstring (10) by the unwinding force of the mainspring (7). It is intended to maintain the smoothness and reliability of the.

〔The invention's effect〕

As described above, the winding device of the present invention includes a fixed shaft provided on the support shaft member in a non-rotatable and sideways state, a pulley rotatably supported on the fixed shaft, and an operation drawstring wound on the pulley. The spring is installed between the fixed shaft and the pulley as a state in which the force is accumulated during the pulling down operation of the pulling cord and released when the pulling down operation is released, and the protruding side is provided so as to surround the fixed shaft on the side surface of the pulley. A ring-shaped driving body, and a ring-shaped driven body in which one end side portion is rotatably fitted on the outside of the ring-shaped driving body and the inner diameter of the one end side portion is the same as the inner diameter of the ring-shaped driving body. , A pulley disconnection side coil spring inserted so that the outer peripheral surface of the one end side portion is lightly pressed against the inner peripheral surface of the ring-shaped driving body and the outer peripheral surface of the other end side portion is lightly pressed against the inner peripheral surface of the ring-shaped driven body. And, with the fixed shaft unable to rotate A fixed boss-shaped driving body, a boss-shaped driven body rotatably mounted at a position between the pulley separation side coil spring of the fixed shaft and the boss-shaped driving body, and an inner peripheral surface of one end side portion of the boss-shaped driven body. Coil spring attached to the outer peripheral surface of the driven body in a state where the inner peripheral surface of the other end side portion is lightly pressed against the outer peripheral surface of the boss-shaped driven body, and a coil provided on the boss-shaped driven body. It is characterized in that it has an engaging projection and an engaging fold provided at the end of the pulley separation side coil spring so as to enter the trajectory of the engaging projection. When used in combination with the mechanism of the parts shown in (28) to (72), hoisting and unwinding by applying pulling down force with one hand or letting go, as explained in the operation. That is, the hoisting device of the present invention. When used in combination with the above mechanism, it enables one-handed operation of raising and lowering curtains, screens, blinds, etc., and has an excellent effect of completely achieving the intended purpose. In particular, in the present invention, one end side portion is rotatably attached to a boss-shaped driving body which is non-rotatably fixed to the fixed shaft, and a portion of the fixed shaft between the pulley separation side coil spring and the boss-shaped driving body. A boss-shaped follower whose other end side portion is fitted in the end portion of the ring-shaped follower in a freely rotatable manner, and an inner peripheral surface of the one end-side portion on the outer peripheral surface of the boss-like driven body at the other end-side portion. The fixed shaft disconnecting side coil spring attached with the inner peripheral surface lightly pressed against the outer peripheral surface of the boss-like driven body, the engaging protrusion provided on the boss-like driven body, and the end of the pulley separating-side coil spring. Within the locus of the protruding part As described above, the engagement foot provided in a state of being inserted means the smoothness of the rotation of the ring-shaped driven body as the pulley separation side coil spring increases in diameter as the ring-shaped driven body rotates. And a function of preventing the reliability from being hindered, a function of maintaining the smoothness and reliability of the rotating state of the ring-shaped driven body and the pipe-shaped winding shaft, and winding of the drawstring for operation by the unwinding force of the mainspring. It has the function of maintaining the smoothness and reliability of the return, and has a remarkable effect of reliably operating as a whole.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall perspective view showing an embodiment of a winding device of the present invention, FIG. 2 is an exploded perspective view of essential parts, and FIG. 3 is FIG. 1A-A.
4 is a sectional view taken along line BB of FIG. 3, FIG. 5 is a sectional view taken along line CC of FIG. 3, and FIG. 6 is taken along line DD of FIG. FIG. 7 is a sectional view taken along the line EE of FIG. 3, FIG. 8 is a sectional view taken along the line FF of FIG. 3, and FIG. 9 is an overall perspective view showing a conventional example. Fig. 10 is Fig. 9G-
It is sectional drawing which follows the G line. (1) (2) ... Support member, (3) ... Mounting member, (4) ...
Fixed shaft, (5) ... pulley, (6) ... recess, (7) ... mainspring, (8) ... slit, (9) ... hooking notch, (1
0) ... drawstring, (10) '... inner end, (11) ... end stop, (13) ... ring-shaped driving body, (14) ... ring-shaped driven body, (15) ... pulley separation side Coil spring, (16) ... Clutch for separating pulley, (18) ... Brim, (19) ... Boss-shaped driving body, (20) ... Screw, (21) ... Brim, (22) ... Boss-driven body, ( 23) ... fixed shaft disconnecting side coil spring, (24) ... fixed shaft disconnecting clutch, (25) ... engaging projections, (26) ... engaging legs, (28) ... square shaft hole, (29) )… Bearing member, (30)… Holding box, (31)… Coil spring for separating angular axis, (32)…
Engagement foot, (23) ... Engagement notch, (34) ... Square axis cutting clutch, (36) ... Square axis, (37) ... Hollow partition chamber, (38) ...
On the other hand, hollow partition chamber, (39) ... Rotating drum, (40) (41) ...
Metal, (42)… pipe-shaped reel, (43)… weight rod,
(44) ... curtain, (46) ... fixed side turntable, (47) ... boss shaft, (48) ... movable side turntable, (49) ... C Washer,
(50) ... circular groove, (51) (51) '... butt wall, (52) (5
2) '... Arc-shaped groove, (53) (53)' ... S-shaped groove, (5
4) (54) '... Introduction leaf spring, (55) ... recess, (56) ...
Piece, (57) ... Pressing spring, (58) ... Protrusion pin, (59) (5
9) '... Guide overhang, (60) (60)' ... Locking overhang, (61) ... Disc, (62) ... Small gear, (63) ... External gear, (64) ( 65) ... Center shaft, (66) ... Internal gear, (67)
… Planetary gearbox for speed-up, (68)… Impeller-like part, (69)…
Blade, (70) ... compartment, (71) ... weight body, (72) ... governor device, (74) (75) ... auxiliary member, (76) ... recess,
(77) ... Projection, (78) ... Spring, (80) ... Ball chain, (81) ... Pulley, (82) (83) ... Straight section.

Claims (1)

(57) [Claims] 1. A fixed shaft provided on a support shaft member in a non-rotatable and sideways state, a pulley rotatably supported by the fixed shaft, an operation drawstring wound on the pulley, and an operation drawstring. A mainspring that is interposed between the fixed shaft and the pulley as a state that stores the force during the pulling operation and releases the force when the pulling operation is released, and a ring-shaped original protruding from the side of the pulley that surrounds the fixed shaft. A moving body, a ring-shaped driven body in which one end side portion is rotatably fitted on the outside of the ring-shaped driving body, and the inner diameter of the other end side portion is the same as the inner diameter of the ring-shaped driving body; The outer peripheral surface of the part is attached to the inner peripheral surface of the ring-shaped prime mover, and the outer peripheral surface of the other end is lightly pressed against the inner peripheral surface of the ring-shaped driven body. Boss-shaped original fixed as non-rotatable Body, a boss-like driven body that is rotatably mounted between the fixed shaft pulley separation side coil spring and the boss-like prime mover, and the inner peripheral surface of one end side part is the outer peripheral surface of the boss-like prime mover. A fixed-shaft disengagement side coil spring attached so that the inner peripheral surface of the other end side portion is lightly pressed against the outer peripheral surface of the boss-shaped follower, an engagement protrusion provided on the boss-shaped follower, and a pulley. A hoisting device comprising: an end of the disconnection-side coil spring; and an engaging fold provided so as to enter the end of the engaging projection in the trajectory of the engaging projection.