JPH07112918B2 - Lever type hoisting machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lever type hoisting machine, and more particularly to a lever type hoisting machine which maintains a normal operation even when an erroneous operation is carried out in a state where a small load is applied. It is about.

[0002]

2. Description of the Related Art The applicant has been improving the lever type hoisting machine in the past, and, for example, Japanese Patent Application No. 5-136567.
No. 1 proposes a lever-type hoisting machine that realizes stable idle motion.

FIG. 7 is a diagram showing a main part of the lever type hoisting machine when it is in an idle state.
The lever type hoisting machine includes a drive shaft 50 having a thread groove,
A pressure receiving member 51 screwed to the drive shaft 50, a reverse rotation preventing wheel 52 fitted to a boss portion of the pressure receiving member 51, and friction members 53 and 54 for sandwiching the reverse rotation preventing wheel 52 from both sides,
The pressing drive member 55 that moves back and forth on the drive shaft 50, and the drive shaft 5
A rotation limiting member 56 that is splined to 0 to limit the rotation of the pressing drive member 55, an operation wheel 57 that is rotatably fitted to the outer periphery of the rotation limiting member 56, and a splined connection to the drive shaft 50. Spring retainer 58 and operation wheel 57
An idling holding plate 59 that rotates integrally with the idling holding plate 59;
Is constituted by a spring 60 or the like that biases the spring retainer 58 toward the spring retainer 58.

The idle holding plate 59 and the spring retainer 58 are provided with uneven portions which engage with each other. In the idle state, the drive shaft 50 is driven by the engagement of the uneven portions and the urging force of the spring 60. The spring retainer 58, the idling holding plate 59, and the operation wheel 57 rotate integrally. The operation wheel 57 has a press release protrusion 57a.
Is provided, and the press release projection 57a engages with the press drive member 55, so that the operation wheel 57 and the press drive member 5 are provided.
5 also rotates integrally, and the gap δ between the friction member 54 and the pressing drive member 55 is maintained.

[0005]

However, in the lever hoisting machine constructed as shown in FIG. 7, the operating wheel 57 is mistakenly turned in the idling direction while a small load is applied. If it does, there is a risk that the idling state will not automatically return to the idling released state. That is, since the suspended load is a small load (for example, 15 kg or less), there is a risk that the idle state is maintained and the suspended load slides down.

The present invention has been made in view of this problem. Even if the operating wheel is rotated in the idling direction while a small load is suspended, it immediately returns to the idling release state automatically. An object of the present invention is to provide a lever type hoisting machine that prevents slipping of luggage.

[0007]

In order to achieve the above object, a lever type hoisting machine according to the present invention is (a) inserted into a load sheave and connected to the load sheave through a gear transmission system. And a (b) a pressure receiving member that is arranged axially outside adjacent to the load sheave and is fixed to the drive shaft, and (c) facing the axially outer end surface of the pressure receiving member, A pressing drive member that is screwed so as to be able to advance and retreat on the drive shaft, and an operation handle is engaged as necessary, and (d) is interposed between the pressure receiving member and the pressing drive member, A reverse rotation preventing wheel that is provided so as to be rotatable only in one direction with respect to the shaft, and (e) a pair of friction members that are arranged on both sides of the reverse rotation preventing wheel and that can be pressed by the pressing drive member, f) arranged adjacent to the axially outer side of the pressing drive member, The rotation limiting member splined to the drive shaft, and (g) has a bottom wall portion and a cylindrical portion, the bottom wall portion is rotatably abutted on the outer peripheral portion of the rotation limiting member, and the cylindrical portion. An operating wheel having a locking groove formed on the inner peripheral surface thereof, and (h) a peripheral flange portion and a central recess portion, the central recess portion being in contact with the axially outer side of the rotation limiting member, A spring retainer that is splined to the drive shaft, and (i) an idle holding plate that abuts on the inner side in the axial direction of the peripheral flange of the spring retainer and is locked by the locking groove of the operating wheel. (J) first biasing means for exerting a biasing force on each of the idling holding plate and the operating wheel, and (k) provided at a portion of the operating wheel facing the pressing drive member, Engaging means for engaging a part of the pressing drive member, and (l) provided at a portion of the pressing drive member facing the operation wheel, And the engaged means being means engageable formed, (m)
It is characteristically provided with a second urging means that engages with each of the pressing drive member and the rotation limiting member and applies an urging force so that the pressing drive member presses the friction member.

[0008]

The second urging means is composed of, for example, a coil spring or a leaf spring, and constantly urges the pressing drive member so that the pressing drive member rotates in the direction of pressing the friction member. Therefore, due to the operation wheel being operated incorrectly,
Even if the engaging means of the operation wheel and the engaged means of the pressing drive member engage with each other and the pressing drive member tries to move outward on the drive shaft, the pressing drive member moves the drive shaft in the direction of pressing the friction member. Rotate the top to automatically release the idling state. Since this operation is realized regardless of the size of the suspended load,
There is no risk of accidental slipping of luggage due to incorrect operation of the operating wheel.

[0009]

The present invention will be described in more detail based on the following examples. In FIG. 1, a load sheave 3 is provided between a pair of side plates 1 and 2 which are held in parallel at a constant interval. The load sheave 3 is rotatably held by bearings 4 and 4. There is. A shaft hole 3a passes through the center of the load sheave 3, and a drive shaft 5 is rotatably inserted in the shaft hole 3a. Both ends of the drive shaft 5 are
The load sheave 3 projects from both left and right ends. Means for driving the load sheave 3 is provided on the right-side protrusion of the drive shaft 5. The first screw portion 5a, the shaft portion 5b, and the spline portion 5 are arranged on the protruding portion in order from the side closer to the side plate 2.
c and the second screw portion 5d are formed. The screw parts 5a and 5d are both right-handed screws. On the other hand, a pinion gear G ₁ is fixedly provided on the left-side protruding portion of the drive shaft 5, which is a reduction gear transmission series G ₂ , G ₃ and G ₄
Is connected to the load sheave 3 via. The gears G _{1 to} G ₄ are covered with a cover 20A attached to the side plate 1.

A pressure receiving member 6 and a pressing drive member 7 are screwed into the first screw portion 5a of the drive shaft 5 from the side closer to the side plate 2, and the pressure receiving member 6 is the maximum screw portion of the first screw portion 5a. It is screwed and fixed to the inside. The pressure receiving member 6 has a disc portion 6a and a boss portion 6b.
Is close to the side plate 2, and the boss portion 6b is formed so as to project outward in the axial direction from the central portion of the disc portion 6a.
A pair of friction members 8 and 9 and a reverse rotation preventing wheel 10 sandwiched between them are fitted to the boss portion 6b.

The reverse rotation preventing wheel 10 is provided with locking teeth on its outer circumference which are inclined in one direction in the circumferential direction. The anti-reverse rotation wheel 10 and the friction members 8 and 9 arranged on both sides thereof are pressed by the pressing drive member 7, and are sandwiched between the disc portion 6 a and the pressing drive member 7. Is configured to. The ratchet pawl 11 is pivotally supported on the side plate 2 and is pressed against the outer peripheral portion of the anti-reverse rotation wheel 10 by a spring 12. The ratchet pawl 11 is engaged with the locking teeth of the anti-reverse rotation wheel 10 to lock the anti-reverse rotation wheel 10 so that it can rotate only in the winding direction of the load sheave 3.

As described above, the pressing drive member 7 is screwed on the first screw portion 5a so as to be able to move forward and backward in the axial direction. The pressing drive member 7 may be integrally formed,
As shown in FIG. 2, the main body portion _7-1 and the pressing plate _7-2 may be separately formed. Even if formed separately, the main body 7 _-1
And the pressing plate 7 _-2 operate integrally. The pressing drive member 7 is formed with an annular recessed hole 7a on its axially outer end surface. The annular recessed hole 7a is provided with a first ridge 7b and a second ridge 7c extending in the radial direction. Has been. As shown in FIG. 2, the central angles of the two portions 7a _-1 , 7a _-2 of the annular recessed hole 7a divided by the first ridge 7b and the second ridge 7c are greatly different from each other.

A rotation limiting member 14 is attached adjacent to the pressing drive member 7, and the rotation limiting member 14 is
It is splined to the spline portion 5c of the drive shaft 5. The rotation limiting member 14 has a rotation limiting protrusion 14a formed on the end surface facing the pressing drive member 7, and a boss portion 14b formed axially outward on the opposite end surface. The rotation limiting member 14 is positioned with respect to the pressing drive member 7 such that the rotation limiting projection 14a forms an angle of approximately 30 ° with respect to the first protrusion 7b of the pressing drive member 7 on the rotation side in the winding direction. It is performed by fitting into the spline portion 5c of the shaft 5. In this way, the rotation limiting protrusion 14a is projected into the larger annular recess 7a _-1 , and the first protrusion 7b hits the rotation limiting protrusion 14a, so that the pressing drive member 7 is necessary for the drive shaft 5. The above rotation is prevented, and the pressing drive member 7 is prevented from unnecessarily moving outward in the axial direction.

A coil spring 13 is disposed between the pressing drive member 7 and the rotation limiting member 14 so as to be fitted to the inner boss portion 7e of the pressing drive member 7. This coil spring 13
One end portion 13a thereof is brought into contact with the rotation limiting protrusion 14a of the rotation limiting member 14, and the other end portion 13b is pressed by the pressing drive member 7.
Is in contact with the first ridge 7b. Therefore, the pressing drive member 7 is always biased in the direction of pressing the friction member 9. The ends 13a and 13b of the coil spring 13 are
The opening angle between them is, for example, about 40 °, and a leaf spring may be used instead of the coil spring.

An operation wheel 16 is rotatably fitted to the rotation limiting member 14 on the outer periphery of the boss portion 14b of the rotation limiting member 14. This operation wheel 16 is provided with the rotation limiting member 1
It is formed so as to make surface contact with the outer peripheral portion of 4,
A recess 16c is formed on the outer side in the axial direction. Three engaging recesses 16d are formed on the inner surface of the recessed hole 16c. Further, nine protrusions are formed on the outer periphery of the operation wheel 16. Operation wheel 16 facing the pressing drive member 7
The bottom wall of the concave portion 16c is provided with a pressure release protrusion 16a that protrudes into the smaller annular concave hole 7a _-2 of the pressure drive member 7. The pressure release protrusion 16a is brought into contact with the first ridge 7b (or the second ridge 7c) of the pressing drive member 7 to rotate the pressing drive member 7 counterclockwise (or clockwise),
The pressing drive member 7 is moved to the outside (or inside) in the axial direction.

The spring 15B, the idling holding plate 18, and the spring retainer 17 are housed in the recess 16c of the operating wheel 16 using the nut 15A. The nut 15A is screwed into the second screw portion 5d.

The spring retainer 17 is provided with a central convex portion 17a having a spline hole and a collar portion 17b formed on the peripheral edge portion. Then, the flange portion 17b is formed with uneven portions 17c at three peripheral portions. The central convex portion 17a has a spline hole fitted into the spline portion 5c of the drive shaft 5, and is fixed by a nut 15A. Further, the outer diameter of the central convex portion 17a of the spring retainer 17 is formed to be slightly larger than the outer diameter of the boss portion 14b of the rotation limiting member 14 that comes into contact with the central convex portion 17a. Therefore, even when the operation wheel 16 is pulled outward, the operation wheel 16 does not come off from the rotation limiting member 14, and there is no fear that the pressing release projection 16a and the two protrusions 7b, 7c will come out of engagement. In addition, the concave portion 16 of the operating wheel 16
If the bottom wall of c is formed slightly lower than the end surface of the boss portion 14b of the rotation limiting member so as not to contact the bottom surface of the central convex portion 17a of the spring retainer 17, unnecessary contact with the operating wheel 16 does not occur. preferable.

On the inner surface side of the spring retainer 17 in the axial direction, an annular idle holding plate 18 is inserted. This idle holding plate 1
No. 8 has three arc-shaped convex portions 18a formed on the outer peripheral surface thereof, and a concave-convex portion 18b protruding inward in an arc shape is formed on the annular surface in the middle of each of these convex portions 18a. ing. The arc-shaped convex portion 18a is the operation wheel 1 described above.
It is locked in the engaging recess 16d of No. 6 and therefore the idle holding plate 18 and the operating wheel 16 rotate integrally. Further, the uneven portions 18b of the idling holding plate 18 are shaped so as to engage with the uneven portions 17c at the above-mentioned three places formed on the spring retainer 17.

A spring 15B is interposed between the idling holding plate 18 and the bottom wall of the operating wheel recess 16c. After the operating wheel 16 is fitted to the outer peripheral portion of the rotation limiting member 14, the spring 15B is inserted. , The idling holding plate 18, and the spring retainer 17
Is fitted and fixed by the nut 15A. Therefore, the spring 15B causes the operating wheel 16 to rotate the rotation limiting member 1.
4 as well as the idle holding plate 18 against the spring retainer 17.

The gear 7d of the pressing drive member 7 is housed in the operating handle 19. Operating handle 19
Is composed of an inner case 19a and an outer case 19b. The inner case 19a is provided with an opening that surrounds the pressing member 7 on the friction member 9 side. Outer case 1
9b is provided with an opening that surrounds the outer periphery of the bottom wall portion 16b of the operating wheel 16. Inner case 19a and outer case 19
b is a plurality of screws 26, 26, ... And nuts 27, 2
, ... are integrally connected.

The operation handle 19 extends below the pressing drive member 7, and has a rotation direction switching claw 22 provided therein. The rotation direction switching claw 22 is
It is rotatably held by the shaft 21 with respect to both handle cases 19a and 19b. The shaft 21 is the operation handle 1
9, and a switching lever 23 for switching is attached to the protruding portion. By switching the switching lever 23, the rotation direction switching claw 22 is engaged so as to rotate the pressing drive member 7 in the winding (UP) direction or the winding (DOWN) direction. It is held in a neutral position that does not rotate in the direction of. A pressing member 24 biased upward by a spring 25 is brought into contact with the lower end portion of the rotation direction switching claw 22, and thereby the rotation direction switching claw 22 is elastically held at a predetermined switching position.

An upper hook 3 is provided on the upper portion between the side plates 1 and 2.
3 is provided via a connecting fitting 32. At the lower end of the load chain 28 wound around the load sheave 3,
A lower hook 30 for suspending luggage is connected via a connecting fitting 29. Reference numeral 31 denotes a metal fitting for retaining the luggage, which is pivotally attached to the upper portion of the lower hook 30 so as to be rotatable only inward. 20B is a cover attached to the side plate 2 by a plurality of screws 35 and nuts 36. The cylindrical opening at the center of the cover 20B is overlapped with the outer circumference of the cylindrical opening of the inner case 19a so that the operation handle 19 can reciprocally rotate. A stopper tubular member 34 having a U-shaped cross section is fitted into the inner surface of the tubular opening of the inner case 19a so as to restrict axial movement of the operation handle 19. The stopper tubular member 34 is made of, for example, a steel plate.

Next, the operation of the lever type hoisting machine having the above construction will be described. a. Idling preparation operation When adjusting the length of the chain, etc., after adjusting the switching lever 23 to the neutral position (see FIG. 3), the operation wheel 16
Must be rotated counterclockwise (NON-LOAD direction). Then, the pressing release protrusion 16a of the operation wheel 16 comes into contact with the first ridge 7b of the pressing drive member 7, and the pressing drive member 7 rotates in the counterclockwise direction on the drive shaft 5 to move in the axial direction. Move to the outside. This movement is caused by the pressing release protrusion 16a.
And the first ridges 7b are the end portions 13a, 1 of the coil spring 13.
It is stopped by coming into contact with the rotation limiting protrusion 14a via 3b (see FIG. 5). In this state, a repulsive force is generated in the coil spring 13, but this repulsive force is not enough to push back the operation wheel 16 and the pressing drive member 7, so that it is maintained in the idling preparation state.

B. Idling motion By the above operation, the uneven holding plates 18 and the respective concave and convex portions 18b and 17c (FIG. 2) of the spring retainer 17 are positively engaged by the pressing force of the spring 15B, and the pressing drive member 7 becomes the friction member. 9 is securely held at a position separated by a gap. Therefore, even if the load chain is pulled over its entire length, the drive shaft 5, the spring retainer 17, the idling holding plate 18, the operating wheel 16, the pressing drive member 7 and the like always rotate integrally. , Smooth idling motion is maintained.

C. Idling release operation When the operation wheel 16 is rotated in the clockwise direction, the pressure release protrusion 1
6a is brought into contact with the second protrusion 7c of the pressing drive member 7, and the pressing drive member 7 is rotated clockwise on the drive shaft 5 to move inward in the axial direction. By this operation, the reverse rotation prevention wheel 10
Is sandwiched between the friction members 8 and 9, and the idling state is released. Even if you do not perform the above operation,
If a load is applied to the load chain 28 in the idling state, the idling state is automatically released by the drive shaft 5 rotating counterclockwise.

D. When a load is applied When it is desired to lift the load, it is necessary to switch the switching lever 23 in the winding direction (UP) (see FIG. 4).
When the operation handle 19 is reciprocated after such a switching operation, the load is wound up by the amount of movement of the operation handle 19 in the clockwise direction. On the other hand, when it is desired to suspend the load, the switching lever 23 is set in the winding direction (DOWN).
Need to switch to. When the operation handle 19 is reciprocated after such an operation, the load is increased.
It is unwound by the amount of movement of the counterclockwise direction.

E. In case of erroneous operation with a small load applied. In the conventional device, when the operation wheel 16 is erroneously operated to be in the idling state, the suspended load is light (for example, 1
In the case of 5 kg or less), the idling state may be maintained without being released. However, in the present invention, the pressing drive member 7 is constantly biased by the biasing force of the coil spring 13 so as to rotate clockwise on the drive shaft 5. Therefore, if the load is suspended,
Even if it has a small load, the pressing drive member 7
Will instantly rotate clockwise on the drive shaft 5, and the pressing drive member 7 will be brought into close contact with the friction member 9 to automatically release the idling state. That is, unlike the conventional device, there is no fear that the suspended load with a small load will slide down due to the idling operation under a small load.

[0028]

As described above, the lever type hoisting machine according to the present invention characteristically includes the second urging means, and the second urging means rotates with the pressing drive member. The pressing drive member is urged to press the friction member by engaging with each of the restricting members. Therefore, even if the operating wheel is erroneously operated and the engaging means of the operating wheel and the engaged means of the pressing drive member are engaged with each other, and the pressing drive member tries to move outward on the drive shaft, the pressing drive is performed. The member rotates on the drive shaft in the direction of pressing the friction member to automatically release the idling state. Since this automatic release operation is realized regardless of the size of the suspended load, there is no risk of accidentally dropping the luggage due to erroneous operation of the operating wheel.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side surface showing an embodiment of the present invention.

FIG. 2 is a developed view showing a main part of FIG.

FIG. 3 is a front view of relevant parts for explaining a free rotation operation.

FIG. 4 is a front view of relevant parts for explaining a load lifting operation.

FIG. 5 is a schematic diagram for explaining an idling operation.

FIG. 6 is a schematic diagram for explaining a load lifting operation.

FIG. 7 is a sectional view showing a main part of a conventional device.

[Explanation of symbols]

 3 load sheave 5 drive shaft 6 pressure receiving member 7 pressing drive member 7b, 7c ridges (engaged means) 8, 9 pair of friction members 10 reverse rotation prevention wheel 13 coil spring (second biasing means) 14 rotation limiting member 15B Spring (first urging means) 16 Operation wheel 16a Press release projection (engagement means) 16b Bottom wall portion 16c Inner peripheral surface of cylindrical portion 17 Spring retainer portion 18 Idling holding plate

Claims (1)

[Claims] 1. A drive shaft which is inserted into a load sheave and which is connected to the load sheave through a gear transmission series, and which is arranged axially outside adjacent to the load sheave and fixed to the drive shaft. A pressure receiving member, a pressing drive member facing the axially outer end surface of the pressure receiving member, screwed so as to be able to move forward and backward on the drive shaft, and an operation handle is engaged as necessary, and the pressure receiving member. A reverse rotation prevention wheel that is interposed between a member and the pressing drive member and is rotatable only in one direction with respect to the drive shaft, and is arranged on both sides of the reverse rotation prevention wheel and is pressed by the pressing drive member. A pair of friction members provided so as to be possible, a rotation limiting member that is disposed adjacent to the outside of the pressing drive member in the axial direction, and is spline-coupled to the drive shaft, and a bottom wall portion and a cylindrical portion, The bottom wall is the above It has an operating wheel that is rotatably abutted on the outer peripheral portion of the rotation limiting member and has a locking groove formed on the inner peripheral surface of the cylindrical portion, a peripheral flange portion and a central concave portion. The spring restraining member is abutted on the outer side in the axial direction of the rotation limiting member and is spline-coupled to the drive shaft, and is abutted on the inner side in the axial direction of the peripheral flange portion of the spring restraining member, and An idling holding plate that is locked by the locking groove; a first biasing means that applies a biasing force to each of the idling holding plate and the operating wheel; and an operating wheel that opposes the pressing drive member. An engaging means that is provided at a portion of the pressing drive member and that engages with a part of the pressing drive member; Engaging means, engaging with the pressing drive member and the rotation limiting member, respectively. Lever-type hoist, characterized in that the press drive member and a second biasing means for applying a biasing force to press the friction member.