JP2002193591A - Lever type hoist - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lever type hoist capable of securely preventing a slip of a baggage even if a small load is applied and capable of easily and securely performing the free rotation when necessary. SOLUTION: This lever type hoist is provided with a pressure receiver member 9 fixed to a driving shaft 2, a pressing driving member 10 screwed to the driving shaft and for pushing the pressure receiver member 9 for normal rotation through a brake plate 11 and a reverse rotation preventing wheel 12, a rotation limiting projection 15 to be integrally rotated with the driving shaft and for preventing the reverse rotation of the pressing driving member 10 any more by abutting on the pressing driving member when the pressing driving member 10 is reversely rotated to release the pressing to the pressure receiver member 9, a steering wheel 3 with a pressing releasing projection 3a to be integrally rotated with the rotation limiting member 15 and to be relatively rotated by the axial directional movement and for reversely rotating the pressing driving member by abutting on the pressing driving member 10, and a coil spring 16 for energizing the steering wheel 3 in a direction for reverse rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lever type hoist, and more particularly, to a lever type hoist which can surely prevent a load from slipping off even when the load is small and can easily and surely perform idle rotation. It relates to a hoist.

[0002]

2. Description of the Related Art The general structure of a conventional lever type hoisting machine is as follows.
As shown in FIG. 5, the pressure receiving member B is fixed to the drive shaft A,
A reverse rotation preventing wheel D sandwiched between a pair of brake plates C, C is provided on a boss portion of the pressure receiving member B, and a pressing drive member F is screwed on a screw portion of the drive shaft A so as to be able to advance and retreat by operating an operation handle E. Had been combined. A rotation limiting member G is fixed to a drive shaft projecting rightward from the pressing drive member F, and an operation wheel H is rotatably provided on an outer peripheral portion of the rotation limiting member G. The rotation limiting member G and the operating wheel H have protrusions h,
g is provided, and the protrusion rotates the pressing drive member F.

[0003] A spring I is provided between the pressing drive member F and the pressure receiving member B opposing the pressing drive member F in a direction to separate them, so that a gap is opened between both members F and B. The idle rotation was enabled while maintaining the gap. Alternatively, a spring for pressing the operation wheel H against the rotation restricting member G is provided in the operation wheel H, so that a gap is opened between the pressing drive member F and the pressure receiving member B, and then the gap is held to allow the idle rotation. Some made it possible.

[0004]

However, the conventional lever-type hoist described above maintains the free-running environment only by the biasing force of the spring. Was always rotatable relative to its structure. For this reason, there is a risk that the idle rotation becomes impossible during idle rotation with no load, and conversely, even if a small load is suspended, the idle state is maintained and the load slips down.

The present invention has been made in view of the above circumstances, and a main object of the present invention is to prevent a load from slipping down when a small load is applied, and to facilitate the idle rotation when the idle rotation is required. An object of the present invention is to provide a lever-type hoist that can be reliably performed by using a lever.

[0006]

In order to achieve the above object, a lever-type hoist according to the present invention comprises the following (A) to (G).
It is characterized by having the following configuration requirements. (A) A drive shaft connected to a load sheave via a gear transmission system. (B) A pressure receiving member fixed to the drive shaft. (C) A reverse rotation preventive wheel provided on the pressure receiving member and having a brake plate superimposed on both surfaces and capable of only normal rotation. (D) A pressing drive member which is screwed to the drive shaft so as to be able to advance and retreat, and which can press the pressure receiving member via the brake plate and the anti-reverse wheel to rotate forward. (E) a rotation that is rotatable integrally with the drive shaft, and is formed with a rotation limiting protrusion that contacts the pressing drive member when the pressing drive member reversely rotates to release the pressing against the pressure receiving member and prevents further reverse rotation; Restriction member. (F) A push-release that is rotatable integrally with the rotation-limiting member, is rotatable relative to the rotation-limiting member by axial movement with respect to the rotation-limiting member, and is capable of reversely rotating the pressing-drive member by contacting the pressing-drive member. An operation wheel with projections. (G) A coil spring that urges the operation wheel in the reverse direction.

In the lever type hoist according to the present invention, preferably, in addition to the above-described configuration, the rotation restricting member has a cylindrical portion, and a rotation restricting projection and a radially outwardly extending portion are provided on the pressing drive member side. A projection is formed. Further, the operating wheel is formed with a circular hole to be fitted with the cylindrical portion of the rotation restricting member, and an engaging groove engaged with the projection of the rotation restricting member on the pressing drive member side; A projection is formed. Further, the operating wheel is urged in the reverse rotation direction with respect to the rotation restricting member by a coil spring disposed in the operating wheel. The operation wheel has a circular hole fitted in the cylindrical portion of the rotation restricting member so as to be movable in the axial direction, and in a state where the protrusion of the rotation restriction member is engaged with the engagement groove, the operation wheel and the rotation restricting member are in contact with each other. While being integrally rotated, the shaft is moved in the axial direction with respect to the rotation restricting member, and the projection of the rotation restricting member is disengaged from the engagement groove. After being reversed, the pressing drive member is reversely rotated by the pressing release protrusion until the pressing drive member hits the rotation restricting protrusion of the rotation restricting member.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a lever type hoisting machine 1 according to the present invention will be described.
Will be described in more detail. In the following description, the left-right direction is the axial direction of the drive shaft 2 in FIG. 1, and the operation wheel 3 side is defined as the right side. The clockwise direction (forward rotation) or the counterclockwise direction (reverse rotation) is defined as a rotation direction about the drive shaft 2 as viewed from the right side.

FIG. 1 is a longitudinal sectional view showing an embodiment of a lever type hoisting machine 1 according to the present invention, and FIG. 2 is an exploded perspective view of a main part of the lever type hoisting machine 1. In FIG. 1, a load sheave 7 is rotatably provided by bearings 6, 6 between a pair of side plates 4, 5 which are separated from each other and held in parallel. A shaft hole 7a is formed at the center of the load sheave 7 so as to penetrate in the left-right direction. The drive shaft 2 is rotatably inserted into the shaft hole 7a. The left and right ends of the drive shaft 2 are disposed so as to protrude from the left and right sides of the load sheave 7.

[0010] A means for driving the load sheave 7 is provided on the right protrusion of the drive shaft 2. The first screw portion 2a and the first screw portion 2a
A spline portion 2b slightly smaller in diameter than the screw portion 2a and a second screw portion 2c are formed. Each of the first screw portion 2a and the second screw portion 2c is a right-hand thread.

On the other hand, a pinion gear 2d is provided on the left protrusion of the drive shaft 2. This pinion gear 2d
Are connected to the load sheave 7 via a reduction gear transmission system G. These gears 2 d and G are covered by a cover 8 attached to the side plate 4.

A pressure receiving member 9 and a pressing drive member 10 are screwed into the first screw portion 2a of the drive shaft 2 from the side closer to the side plate 5. The pressure receiving member 9 is screwed to the innermost part of the first screw portion 2a and fixed to the drive shaft 2. on the other hand,
The pressing drive member 10 is screwed to the first screw portion 2a so as to advance and retreat adjacent to the right side of the pressure receiving member 9.

The pressure receiving member 9 is located on the left side near the side plate 5,
A flange-shaped disk portion 9a is formed. Also,
The pressure receiving member 9 is turned rightward from the center of the disk 9a,
The boss 9b is formed to protrude. In the boss 9b of the pressure receiving member 9, a reverse rotation prevention wheel 12 having brake plates 11, 11 superposed on both end surfaces is fitted.

The anti-reverse wheel 12 has locking teeth formed on the outer periphery thereof, which are inclined in one direction in the circumferential direction, at predetermined intervals in the circumferential direction. The reverse rotation preventing wheel 12 and the brake plates 11, 11 disposed on both sides thereof can be pressed against the disk portion 9 a of the pressure receiving member 9 by the pressing drive member 10.
That is, the anti-reverse wheel 12 is connected to the disc portion 9 of the pressure receiving member 9.
a and the pressing drive member 10.

The reverse rotation preventing wheel 12 is engaged with a ratchet pawl 13 held on the side plate 5. This ratchet claw 13
Is pressed against the outer periphery of the anti-reverse wheel 12 by the spring 14 and is engaged with the locking teeth of the anti-reverse wheel 12. Thereby, the reverse rotation preventing wheel 12 can be rotated only in the winding direction of the load sheave 7, that is, only the normal rotation can be performed.

The pressing drive member 10 is formed in a substantially cylindrical shape, and is screwed to the first screw portion 2a of the drive shaft 2 so as to be able to advance and retreat. As shown in FIG. 1, a shallow circular hole 10a into which the tip of the boss 9b of the pressure receiving member 9 can be inserted is formed in the center of the left side surface of the pressing drive member 10. On the other hand, on the right side surface of the pressing drive member 10, as shown in FIG. 2, substantially fan-shaped concave grooves 10b are formed.

The concave grooves 10b of the pressing drive member 10 are formed in a number corresponding to the number of the pressing release projections 3a of the operation wheel 3 described later. In this embodiment, two concave grooves 10 of the same shape are used.
b are formed to face each other in the radial direction. In the right half of the outer peripheral portion of the pressing drive member 10, teeth 10c are formed at regular intervals in the circumferential direction.

The spline portion 2b of the drive shaft 2 is provided with a rotation restricting member 15 by spline connection adjacent to the right side of the pressing drive member 10. Therefore, the rotation limiting member 15
Are provided so as to be able to rotate integrally with the drive shaft 2.
As shown in FIG. 2, the rotation restricting member 15 includes a boss-shaped cylindrical portion 15a, and a flange portion (protruding portion) 15b is integrally formed at a left end portion thereof so as to protrude radially outward. An engagement hole 15c for engaging the spline portion 2b of the drive shaft 2 is formed in the center of the rotation restricting member 15 along the axial direction.

The flange 15b of the rotation restricting member 15 has various shapes other than a circle, and is formed, for example, in a substantially rectangular plate shape. In the illustrated example, the left and right ends of the flange-shaped disk are cut off. On the left side surface of the flange 15b of the rotation restricting member 15, a rotation restricting projection 15d is formed to protrude leftward. In FIG. 2, a rotation restricting projection 15d is formed integrally with a flange 15b projecting upward from the cylindrical portion 15a.

The rotation restricting member 15 has its rotation restricting projection 1
5 d is arranged so as to protrude into one concave groove 10 b of the pressing drive member 10. Therefore, when the pressing drive member 10 is reversely rotated to retreat from the first screw portion 2a of the drive shaft 2, the groove 1
The rotation restricting projection 15d abuts on one end in the circumferential direction of 0b, so that the relative rotation of the pressing drive member 10 and the drive shaft 2 is no longer possible, and the pressing drive member 10 is unnecessarily moved to the right in the axial direction. Is prevented.

The operating wheel 3 is fitted around the outer periphery of the cylindrical portion 15a of the rotation restricting member 15. The operation wheel 3 has a substantially cylindrical shape having a concave hole 3b opened to the right, and is fitted to the outer periphery of the cylindrical portion 15a of the rotation restricting member 15 on the left side wall (the bottom wall of the concave hole 3b). A circular hole 3c is formed. On the left side of the left side wall of the operation wheel 3, an engagement groove 3d is formed adjacent to the circular hole 3c so as to be able to engage with the flange 15b of the rotation restricting member 15. In this embodiment,
A substantially rectangular engaging groove 3d extends in the radial direction of the operation wheel 3 and is formed in a notch on the left side surface of the operation wheel 3 corresponding to the flange 15b of the rotation restricting member 15. A plurality of irregularities 3e are formed at regular intervals in the circumferential direction on the outer peripheral portion of the operation wheel 3, so that the operation wheel 3 can be easily held and rotated.

On the left side wall of the operation wheel 3 opposed to the pressing drive member 10, a pressing release projection 3a protruding into each concave groove 10b of the pressing driving member 10 is integrally formed so as to protrude leftward. In the present embodiment, the pressing release projection 3a is disposed at the upper and lower positions on the short side of the engagement groove 3d of the operation wheel 3 so as to face the operation wheel 3 in the radial direction.
Are formed, and are respectively protruded into the respective concave grooves 10 b of the pressing drive member 10.

A right-handed coil spring 16 is housed and mounted in the concave hole 3b of the operation wheel 3. This installation
This is performed using the spring receiving member 17. The spring receiving member 17 of this embodiment has a substantially hat-shaped cross section as shown in FIG. That is, the central portion has a cylindrical portion 17a projecting to the left, and the cylindrical portion 17a is opened to the right,
A flange 1 protrudes radially outward from the outer periphery of the right end.
7b is integrally formed.

The cylindrical portion 17a of the spring receiving member 17
Is formed smaller than the inner diameter of the coil spring 16 and larger than the outer diameter of the cylindrical portion 15a of the rotation restricting member 15. The outer diameter of the flange 17b of the spring receiving member 17 is formed so as to match the inner diameter of the concave hole 3b of the operating wheel 3. Further, an engagement hole 17c that is compatible with the spline portion 2b of the drive shaft 2 is formed in the center of the spring receiving member 17 (the bottom of the cylindrical portion 17a).

The coil spring 16 has one end locked by a notch formed at the bottom (left side wall) of the concave hole 3b of the operation wheel 3 and the other end formed at the flange 17b of the spring receiving member 17. In a state locked in the small hole, the spring receiving member 17 is relatively rotated (reversely rotated) in the circumferential direction by, for example, about 90 degrees with respect to the operation wheel 3 to compress it, and the spring 16 is inserted into the concave hole 3 b of the operation wheel 3. Is compressed in the axial direction so as to be accommodated, and the engagement hole 17c of the spring receiving member 17 is engaged with the spline portion 2b of the drive shaft 2 and attached. In this state, the drive shaft 2 is placed in the cylindrical portion 17a of the spring receiving member 17 that opens rightward.
Is disposed. Therefore, by screwing the nut 18 into the second screw portion 2c, the spring receiving member 1
7 is positioned on the drive shaft 2.

Thus, the left side surface of the spring receiving member 17 is disposed in contact with the right side surface of the cylindrical portion 15a of the rotation restricting member 15. The circular hole 3 of the operating wheel 3 is provided in the cylindrical portion 15a of the rotation restricting member 15 so as to be movable in the axial direction.
c is fitted. In addition, the operation wheel 3 includes the rotation restricting member 1
By being sandwiched between the flange portion 15b of FIG. 5 and the left side wall of the spring receiving member 17, the rotation restricting member 15 is prevented from falling off from the cylindrical portion 15a.

The cylindrical portion 1 of the rotation restricting member 15
The axial length of 5a is about the thickness of the left side wall of the operating wheel 3. That is, the circular hole 3c of the operation wheel 3 and the engagement groove 3d
And the length is approximately the sum of the respective depths.

The toothed portion 10c of the pressing drive member 10 is housed in the operation handle 19. The operation handle 19 includes an inner case 19a and an outer case 19b. The inner case 19a is provided with an opening surrounding the brake plate 11 side of the pressing / driving member 10, and the outer case 19
b has an opening surrounding the outer peripheral portion of the left side wall of the operation wheel 3. The inner case 19a and the outer case 19b are integrally connected by a plurality of bolts and nuts.

The operating handle 19 extends below the pressing drive member 10 and has a rotation direction switching claw 20 provided inside thereof. Rotation direction switching claw 20
Is rotatably held by the shaft 21 with respect to the two cases 19a and 19b.

The shaft 21 protrudes out of the operation handle 19, and the protruding portion has a rotation direction switching lever 2
2 are installed. When the switching lever 22 is switched, the rotation direction switching claw 20 causes the pressing drive member 10 to lift (UP) or lower (DO).
In addition to being engaged so as to rotate in the WN) direction, it is held in a neutral position in which it is not engaged in either direction. A pressing member 24 urged upward by a spring 23 abuts on the lower end of the rotation direction switching claw 20, whereby the rotation direction switching claw 20 is elastically held at a predetermined switching position.

An upper hook 25 is provided on the upper portion between the side plates 4 and 5.
Is provided. A lower hook 27 for hanging a load is connected to a lower end of the load chain 26 wound around the load sheave 7. The side plate 5 has a cover 28.
Is attached. The cylindrical opening at the center of the cover 28 is superimposed on the outer periphery of the cylindrical opening of the inner case 19a so that the operation handle 19 can reciprocate. An operation handle 1 is provided on the inner surface of the cylindrical opening of the inner case 19a.
A stopper cylindrical member 29 having a U-shaped cross section for restricting the axial movement of the stopper 9 is inserted.

Next, the operation of the lever type hoist 1 of this embodiment will be described. 3 and 4 are diagrams showing the operating state of the lever-type hoisting machine 1 of the above embodiment. FIG. 3 shows a load applied state, and FIG. 4 shows an idle state. Note that FIG.
(A) is a vertical cross-sectional view of a main part of the hoist, and (B) is the X
-X sectional view, (C) is the YY sectional view. Also,
Similarly, FIG. 4A is a longitudinal sectional view of a main portion of the hoist,
(B) is the MM sectional view, and (C) is the NN sectional view.

When a load is suspended from the lower hook 27 of the load chain 26, the drive shaft 2 rotates (reversely) in the counterclockwise direction in which the load is unwound due to the weight of the load. Receive the power to do. However, since the locking teeth of the reverse rotation preventing wheel 12 provided on the pressure receiving member 9 are engaged in the ratchet claw 13, the pressing drive member 10 tries to rotate clockwise (forward rotation), and the brake plates 11, 11 are rotated.
And the pressure receiving member 9 is pressed via the anti-reverse wheel 12 to maintain the brake state.

In this state, as shown in FIG. 3, the rotation restricting projection 15d of the rotation restricting member 15 and the pressing release projection 3a of the operating wheel 3 are arranged at the circumferentially intermediate portion of the concave groove 10b of the pressing driving member 10. You. In this embodiment, the rotation restricting projection 15d and the pressing release projection 3a are arranged at positions corresponding to the circumferential direction of the pressing drive member 10. The pressing release projection 3a is arranged radially outward from the rotation restricting projection 15d. Further, in this load-loaded state, as described later, the rotation restricting member 1 is necessarily inserted into the engagement groove 3d of the operation wheel 3.
5, the flange portion 15b is fitted.

When it is desired to wind up the load in the braking state as described above, the switching lever 22 is switched in the winding direction (UP), and then the operating handle 19 is reciprocated about the drive shaft 2. As a result, the rotation direction switching claw 20 in the operation handle 19 causes the pressing drive member 10 to rotate forward, the drive shaft 2 to rotate forward via the pressure receiving member 9, and the load sheave 7 to rotate forward. Conversely, when it is desired to unload the luggage, the operation can be performed by reciprocating the operation handle 19 around the drive shaft 2 after switching the switching lever 22 in the unwinding direction (DOWN).

On the other hand, if it is desired to make the idle operation, the switching lever 22 is set to the neutral position and the operating wheel 3 is pulled to the right. As a result, the engagement groove 3d of the operating wheel 3 is removed from the flange 15b of the rotation restricting member 15, and the engagement between the two is released. Therefore, as shown in FIG. 4A, the entire left side wall of the operation wheel 3 is disposed on the outer peripheral portion of the cylindrical portion 15a of the rotation restricting member 15.

Here, the operating wheel 3 is constantly biased against the rotation restricting member 15 in a counterclockwise direction by a right-handed coil spring 16. Therefore, the bottom of the operation wheel 3 is
Is disengaged from the collar portion 15b, and the rotation restricting member 1
5 moves to the cylindrical portion 15a, the operating wheel 3 rotates counterclockwise by the spring force of the right-handed coil spring 16 that has been rotationally compressed.

As a result, as shown in FIGS. 4B and 4C, the pressing release projection 3a of the operating wheel 3 rotates counterclockwise, and the one end (the opposite end) of the concave groove 10b of the pressing driving member 10 is rotated. The pressing drive member 10 is rotated in a counterclockwise direction on the (clockwise end) 10x. However, the rotation limiting member 15
Are integrated with the drive shaft 2 by splines.
Since the same position is maintained, the other end (clockwise end) 10 y of the concave groove 10 b of the pressing drive member 10 is rotated by the rotation limiting protrusion of the rotation limiting member 15 with the rotation of the pressing drive member 10 in the counterclockwise direction. 15d, the rotation limiting projection 15d
Prevents further rotation of the pressing drive member 10. Therefore, the screw drive member 10 is prevented from being unnecessarily screwed back to the right in the axial direction.

As described above, when the switching lever 22 is set to the neutral position and the operating wheel 3 is pulled rightward in the no-load state, the urging force of the coil spring 16 instantaneously reverses the pressing drive member 10 by a predetermined amount. The shaft 2 moves to the right along the first screw portion 2a of the shaft 2 to release the pressing against the brake plate 11. Accordingly, the idle operation can be stably continued by pulling the chain 26.

However, since the spring force of the coil spring 16 is adjusted for idling operation, in a load state where a load is applied, the drive shaft 2 is in a counterclockwise direction in which the load is unwound according to the weight of the load. Direction, and the locking teeth of the anti-reverse wheel 12 are engaged with the ratchet pawl 13, so that the pressing drive member 10 rotates clockwise,
The brake plate 11 and the anti-reverse wheel 12 are pressed against the pressure receiving member 9 to maintain the brake state. In addition, at this time, the rotation of the pressing drive member 10 in the clockwise direction causes the engagement groove 3d of the operation wheel 3 to be fitted into the brim portion 15b of the rotation restricting member 15.
At the corresponding position, the engagement groove 3d and the brim portion 15b are engaged by the axial spring force of the coil spring 16, and the state of FIG. 4 is returned to the state of FIG.

In order to release the idle state in FIG. 4 and return to the load state in FIG.
The rotation of the operation wheel 3 may be rotated clockwise after the rotation of 0 is stopped. Specifically, the switching lever 22 is turned in the winding direction (U
By switching to any one of P) and the lowering direction (DOWN), the rotation direction switching claw 20 of the operation handle 19 is engaged with the toothed portion 10c, so that the rotation of the pressing drive member 10 is prevented. And the operation wheel 3
When the operating wheel 3 is rotated clockwise to a position where the engaging groove 3d of the rotation restricting member 15 corresponds to the flange 15b, the flange 15b enters the engaging groove 3d by the axial spring force of the coil spring 16. The two are engaged.

In this state, the pressing release projection 3 of the operating wheel 3
a is the clockwise end 1 of the concave groove 10b of the pressing drive member 10.
0y. Therefore, by further rotating the operation wheel 3 clockwise, the gap between the pressing drive member 10 and the pressure receiving member 9 can be filled. That is, the pressing release projection 3a
By rotating the pressing drive member 10 clockwise through the shaft, the pressing drive member 10 is rotated against the first screw portion 2a of the drive shaft 2 until the pressing drive member 10 comes into close contact with the brake plate 11.
Can be tightened. As a result, the state is returned to the initial state of FIG.

In the above-described hoisting machine, the switching between the idle state and the load state is performed not only by the spring force of the coil spring as before, but also by the engagement groove 3 d of the operating wheel 3 and the rotation restricting member 15 utilizing the same. Switching is reliably performed by engagement and disengagement with the protruding portion 15b. Therefore, for example, even if a small load of 10 to 20 kg or less is applied to the 500 kg hoist, the load can be reliably prevented from slipping off. That is, even in the case of a small load, the idle rotation can be canceled and the load state can be automatically returned. In addition, the idle state can be reliably maintained when there is no load.

The lever-type hoisting machine 1 of the present invention is not limited to the configuration of the above-described embodiment, but can be appropriately changed. For example, in the above-described embodiment, the substantially fan-shaped concave groove 10b is formed on the right side surface of the pressing drive member 10, but the inside of the annular concave groove is appropriately partitioned by a rim extending in the radial direction. You may.

In the above embodiment, the pressing drive member 10
Two grooves 10b, 10b are formed in one of the grooves 10b.
b, the pressing and releasing projection 3a and the rotation restricting projection 15d protrude, while the pressing and releasing projection 3a protrudes into the other concave groove 10b. The configuration may be such that the pressing release projection 3a and the rotation limiting projection 15d protrude into the concave groove 10b. In this case, the operating wheel 3 may be formed with only one pressing release projection 3a.

In the above embodiment, the engaging hole 3d of the operating wheel 3 and the protrusion (bump) 15b of the rotation restricting member 15 adapted to the engaging hole 3d are each formed in a substantially plate shape. If the engagement hole 3d and the protruding portion 15b can be disengaged by moving the wheel 3, these shapes can of course be appropriately changed.

Furthermore, in the hoisting machine 1 of the above embodiment, the pressing drive member 10 is rotated by the operation handle 19 and the brake plate 11 is directly pressed by the pressing drive member 10. As shown in JP-A-29754, a rotational force transmitting member having a tooth portion is rotated by an operation handle, and a pressing drive member is rotated via a conical friction member fitted inside the brake force transmitting member. Can also be applied to a hoisting machine having a configuration for pressing.

[0048]

As described above in detail, according to the lever type hoist of the present invention, idle rotation can be performed easily and reliably, and when a small load is applied, the load slips off. Can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a lever type hoist of the present invention.

FIG. 2 is an exploded perspective view of a main part of the lever-type hoist shown in FIG.

FIG. 3 shows a load applied state of the lever-type hoist shown in FIG. 1,
(A) is a longitudinal sectional view of a main part of the hoisting machine, and (B) is an X-
X is a cross-sectional view, and (C) is a YY cross-sectional view thereof.

FIG. 4 shows an idle state of the lever-type hoist of FIG. 1,
(A) is a longitudinal sectional view of a main portion of the hoisting machine, and (B) is an MM thereof.
FIG. 4C is a cross-sectional view of FIG.

FIG. 5 is a longitudinal sectional view showing a main part of a conventional general lever-type hoist.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lever type hoisting machine 2 Drive shaft 3 Operating wheel 3a Press-release protrusion 3c Circular hole 3d Engagement groove 7 Load sheave 9 Pressure receiving member 10 Press drive member 11 Brake plate 12 Reverse rotation prevention wheel 15 Rotation restricting member 15a Cylindrical portion 15b Projection Part (rim) 15d Rotation limiting protrusion 16 Coil spring G Gear transmission series

Claims (2)

[Claims] 1. A drive shaft connected to a load sheave via a gear transmission system, a pressure receiving member fixed to the drive shaft, and a brake plate provided on the pressure receiving member, with a brake plate superimposed on both surfaces to perform only forward rotation. A possible reverse rotation prevention wheel, a pressing drive member which is screwed to the drive shaft so as to be able to advance and retreat, and which presses the pressure receiving member via the brake plate and the reverse rotation prevention wheel to be able to rotate forward, and is integrally rotatable with the drive shaft. A rotation limiting member having a rotation limiting protrusion formed to contact the pressing drive member when the pressing drive member reversely rotates so as to release the pressure on the pressure receiving member and to prevent further reverse rotation; An operation wheel formed with a pressing release projection that is capable of rotating relative to the rotation restricting member by axial movement with respect to the rotation restricting member, and that can reverse the pressing drive member by abutting against the pressing driving member; Operation Lever-type hoist, characterized in that it comprises a coil spring for urging in a direction to reverse the wheels. 2. The rotation restricting member has a cylindrical portion, and a rotation restricting projection and a radially outwardly projecting portion are formed on the pressing drive member side, and the operation wheel is a cylinder of the rotation restricting member. A circular hole is formed to be fitted with the protruding portion, and an engagement groove engaged with the projection of the rotation restricting member and a pressing release projection are formed on the pressing drive member side, and are arranged in the operation wheel. The operating wheel is urged in the reverse rotation direction with respect to the rotation restricting member by the coil spring, and the operating wheel has a circular hole fitted in the cylindrical portion of the rotation restricting member so as to be movable in the axial direction. When the protrusion of the rotation restricting member is engaged with the groove, the rotation restricting member is rotated integrally with the rotation restricting member while being axially moved with respect to the rotation restricting member, and the engagement of the protrusion of the rotation restricting member from the engagement groove is performed. Is canceled,
The lever-type lever according to claim 1, wherein the biasing force of the coil spring causes the rotation of the pressing member to be reversed relative to the rotation restricting member, and the pressing drive member is reversely rotated by the pressing release protrusion until the pressing drive member contacts the rotation restricting protrusion. Hoist.