JP2620912B2 - Manual chain block - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manual chain comprising a driving member having a hand wheel and a mechanical brake, and driving a load sheave via the mechanical brake by operating the hand wheel. About the block.

[0002]

2. Description of the Related Art Conventionally, a manual chain block is disclosed in, for example, Japanese Utility Model Publication No. 62-16677.
A load sheave is rotatably supported between a pair of side frames, and a drive shaft is inserted into a center shaft portion of the load sheave, and a hand wheel is screwed on one axial side of the drive shaft. A mechanical brake is interposed between the handwheel and the drive shaft, and a gear reduction mechanism is provided on the other side of the drive shaft in the axial direction, and the operation of the handwheel causes the mechanical brake to intervene. By driving the drive shaft, the load sheave is driven via the gear reduction mechanism.

A hook is provided between the side plates, a wheel cover for covering the mechanical brake and the hand wheel is provided on one side plate, and a gear cover for covering the gear reduction mechanism is provided on the other side plate. Provided.

[0004]

The manual chain block constructed as described above is sometimes used indoors in factories and the like, but is used outdoors in construction sites and the like. On the other hand, the manual chain block is provided with a foil cover for covering the mechanical brake and the hand wheel. A hand chain which is hung on the hand wheel is inserted into a side portion of the wheel cover. Opening for the chain.

Therefore, when the manual chain block is used outdoors, rainwater will enter the wheel cover from the chain passage hole during rainy weather work.
In addition, when used in fine weather or indoors, especially when used in an atmosphere where dust and dust fly, dust such as dust will enter the wheel cover from the conduction hole of the chain.

When rainwater or dust enters the wheel cover as described above, the rainwater or dust causes the lining plate constituting the mechanical brake, that is, between the handwheel and the braking ratchet wheel. Between the lining plate and the lining plate interposed between the braking ratchet and the driven member, and the handwheel, the braking ratchet and the braking surface of the driven member facing the lining plate. This intervention causes a problem that the braking characteristic of the mechanical brake changes or the braking release characteristic changes.

SUMMARY OF THE INVENTION It is an object of the present invention to suppress the intrusion of mechanical brake even if rainwater or dust enters from the foil cover, and to advantageously prevent the mechanical brake from changing its braking and braking releasing characteristics. The point is that it can be eliminated.

[0008]

According to the first aspect of the present invention, there is provided a load sheave supported between side plates and a drive shaft for driving the load sheave. , The driven member 2 coupled to the drive shaft 7
2, a handwheel 8 screwed to the drive shaft 7, a braking ratchet 24 having a toothed portion 4a on the outer peripheral portion, and a braking pawl 28 engaged with the toothed portion 24a of the braking ratchet 24. And a manual chain block provided with lining plates 25 and 26, which extends toward one of the handwheel 8 and the braking ratchet 24 and toward the other, and is located outside the braking ratchet 24 in the axial direction. Circular peripheral surface 30 covering lining plate 26
a cover portion 30 having a circle, and a circular opposing peripheral surface 30b facing the circular peripheral surface 30a of the cover portion 30 is provided on the other of the handwheel 8 and the braking ratchet wheel 24. The circular peripheral surface 30a of 30 is brought closer to the circular opposing peripheral surface 30b.

Further, the invention according to claim 2 provides the cover part 3
A sealing material is provided between the circular peripheral surface 30a of the zero and the circular opposing peripheral surface 30b facing the circular peripheral surface.

The third aspect of the present invention provides a braking pawl 2
4 extends inward in the axial direction with respect to the boss portion 24b on the outer peripheral portion,
A tubular portion 31 is provided to cover the lining plate 25 interposed between the driven member 22 and the braking ratchet wheel 24, and a tooth portion 24 a with which the braking pawl 28 is engaged is provided on the outer peripheral surface of the tubular portion 31. According to the fourth aspect of the present invention, the cylindrical portion 31 of the braking ratchet wheel 24 covers the outer peripheral surface 22b of the driven member 22, and the outer peripheral surface 22b and the inner peripheral surface of the cylindrical portion 31 are provided. 31a
Is provided between them.

[0011]

According to the first aspect of the present invention, the handwheel 8 is provided.
The cover portion 30 is provided on one of the
The circular peripheral surface 30a of the cover 30 and the handwheel 8
And the other side of the brake pawl 24 and the circular peripheral surface 3
0a is brought close to the opposing circular opposing peripheral surface 30b, so that rainwater or dust is generated by the braking claw wheel 24 and the handwheel 8.
Can be prevented from entering between the lining plate 26 interposed therebetween, and the braking claw wheel 24 and the braking surface of the handwheel 8 opposed to each other. It is possible to prevent the braking and releasing characteristics of the mechanical brake from changing due to the intrusion.

According to the second aspect of the present invention, a seal member 50 or 52 is provided between the circular peripheral surface 30a of the cover 30 and the circular opposing peripheral surface 30b facing the circular peripheral surface 30a. Therefore, it is possible to more effectively prevent rainwater and dust from entering without affecting the braking characteristics of the mechanical brake.

According to the third aspect of the present invention, the outer peripheral portion of the braking ratchet wheel 24 extends axially inward with respect to the boss portion 24b, and is disposed between the driven member 22 and the braking ratchet wheel 24. Since the cylindrical portion 31 that covers the interposed lining plate 25 is provided, rainwater or dust is also present between the lining plate 25 and the braking surface of the driven member 22 and the braking ratchet wheel 24 facing the lining plate 25. Can be suppressed, and the braking characteristics and the braking release characteristics of the mechanical brake can be more effectively prevented from changing.

According to the fourth aspect of the present invention, the cylindrical portion 31 of the braking ratchet wheel 24 is provided on the outer peripheral surface 2 of the driven member 22.
2b so as to cover the outer peripheral surface 22b and the cylindrical portion 31.
Between the lining plate 25 and the braking surfaces of the braking ratchet wheel 24 and the driven member 22, which are opposed to the lining plate 25. Can be prevented.

[0015]

FIG. 1 shows a typical embodiment, in which a pair of first and second side plates 1 and 2 are provided with a pair of first and second side plates.
The load sheave 3 is rotatably supported via bearings 5 and 6. A drive shaft 7 is inserted into a shaft hole of the load sheave 3, and a hand wheel (8) is screwed onto one end in the axial direction. A transmission mechanism 10 having a mechanical brake 9 is provided between the handwheel 8 and the drive shaft 7, and a gear having a plurality of reduction gears is provided at the other end of the drive shaft 7 in the axial direction. The driving mechanism is provided with a speed reduction mechanism 11, and the driving force of the handwheel 8 is changed by the driving force of the transmission mechanism 10.
It is transmitted to the load sheave 3 via the gear reduction mechanism 11,
The load sheave mounted on the load sheave 3 can be wound up or down.

More specifically, the side plates 1 and 2
2 is fixed at a predetermined interval by a plurality of stay bolts 12, and a hook 13 is provided above the load sheave 3 on one side in the tangential direction between the side plates 1 and 2.
A mounting shaft 14 for mounting is mounted.

The first side plate 1 includes:
A wheel cover 15 for covering the transmission mechanism 10 and the hand wheel 8 is additionally provided, and a gear cover 16 for covering the gear reduction mechanism 11 is provided on the second side plate 2.
Is attached.

The transmission mechanism 10 includes the drive shaft 7.
A driven member 22 having a flange 22a on one side in the axial direction, the handwheel 8, the flange 22a of the driven member 22, and the boss 8a of the handwheel 8; And a braking claw wheel 24 rotatably supported by the driven member 22
And the flange 22a of the driven member 22 and the braking ratchet 2
4 and lining plates 25 and 26 interposed between the braking ratchet wheel 24 and the boss portion 8a of the hand wheel 8, and the first side plate 1 is provided with a pawl spring 27. A braking claw 28 which is urged by the braking claw wheel 24 and meshes with a toothed tooth 24a provided on the outer peripheral portion of the braking claw wheel 24 is pivotally connected via a claw shaft 29 so as to be swingable. The braking claw 28, the braking claw wheel 24, the driven member 22, the hand wheel 8, and the lining plates 25, 26
Thus, the mechanical brake 9 is constituted.

The above configuration is known, and the embodiment shown in FIG. 1 has the following configuration.
The boss 8a of the hand wheel 8 is provided with the braking pawl 2
4, a circular peripheral surface 3 covering a lining plate 26 interposed between the braking ratchet wheel 24 and the handwheel 9.
0a is formed integrally with the outer peripheral portion of the braking ratchet wheel 24, in the axial direction inward with respect to the boss portion 24b of the ratchet wheel 24, that is, toward the first side plate 1. And a lining plate 26 interposed between the driven member 22 and the driven pawl 24 and the braking pawl 24.
And a toothed portion 24a is provided on the outer peripheral surface of the cylindrical portion 31. The toothed portion 24a is provided on the outer side in the axial direction of the braking ratchet wheel 24, that is, on the outer side of the toothed portion 24a. A circular opposing peripheral surface 30b opposing the circular peripheral surface 30a of the cover portion 30 is formed, and the circular peripheral surface 30a of the cover portion 30 is formed.
Is brought close to the circular opposing peripheral surface 30 b of the braking ratchet 24, and the inner circumferential surface 31 a of the cylindrical portion 31 of the braking ratchet 24 in the axial direction is passed through the flange 22 a of the driven member 22. At the outer peripheral surface of the outer ring.

The first side plate 1 has a bowl-shaped cover body extending toward the inner surface of the handwheel 8 and covering the braking claw wheel 24, the claw shaft 29 and the braking claw 28. The inside end of the tubular portion 31 of the braking ratchet wheel 24 is close to the bowl-shaped cover body 32.

In the above configuration, the cover
Between the circular peripheral surface 30a of the portion 30 and the circular opposing peripheral surface 30b of the braking ratchet wheel 24, and the inner peripheral surface 31a of the tubular portion 31 of the braking ratchet wheel 24 and the outer periphery of the flange 22a of the driven member 22. Between the surface 22b and the cylindrical portion 3
Seal portions are respectively formed between the cover 1 and the bowl-shaped cover body 32, and rainwater and dust entering the wheel cover 8 enter the mechanical brake 9 by these seal portions. Between the lining plate 25 and the driven member 22 facing the lining plate 25 and the braking surface of the braking ratchet wheel 24, and between the lining plate 26 and the braking ratchet wheel 24;
In addition, the intrusion of the handwheel 8 with the braking surface can be suppressed, so that the braking characteristics and the braking release characteristics of the mechanical brake 9 due to the intrusion of rainwater or dust can be avoided.

In FIG. 1, reference numeral 33 denotes a nut which is screwed and fixed to the shaft end of the drive shaft 7, and reference numeral 34 denotes a spacer interposed between the boss 8a of the hand wheel 8 and the nut 33. is there. Reference numeral 35 denotes a first gear which constitutes the gear reduction mechanism 11, and the shaft end of the drive shaft 7 is integrally formed by cold forging. Reference numeral 36 denotes an intermediate shaft rotatably supported between the second side plate 2 and the gear cover 16. The intermediate shaft 36 includes a second gear 37 and a third gear 38 which mesh with the first gear 35. Reference numeral 39 denotes a fourth gear meshing with the third gear 38, which is connected to the cylindrical shaft portion of the load sheave 3.

Numeral 40 denotes a radial bearing of the drive shaft 7 provided on the gear cover 16, which rotatably supports an extended shaft portion 7a extending in the axial direction from the first gear 35. Reference numeral 41 denotes a rolling bearing interposed between the shaft hole of the load sheave 3 and the drive shaft 7 inserted into the shaft hole.

Reference numeral 42 denotes a flange formed integrally with the drive shaft 7 together with the first gear 35, and reference numeral 43 denotes a spacer locked by the flange 42.

Reference numeral 44 denotes a chain key, and reference numeral 45 denotes a cover holder for holding a lower portion of the wheel cover 15. The cover holder is connected to the wheel cover 15 by tightening a nut 46 screwed to the stay bolt 12. 1 side plate 1
Between the two. 47 is a square fitting projection provided on the cover holder 45, and 48 is a square fitting hole provided on the first side plate 1.

Next, a second embodiment shown in FIG. 2 will be described.
In the second embodiment, the circular peripheral surface 30a of the cover portion 30 is used.
And between the circular opposing peripheral surface 30b of the braking ratchet wheel 24,
The seal member 50 is interposed, and the seal member 50 is held on the circular opposed peripheral surface 30b of the braking ratchet wheel 24.

In this manner, the gap between the circular peripheral surface 30a and the circular opposing peripheral surface 30b of the seal member 50 can be changed in both the braking operation and the non-braking operation of the mechanical brake 9. Then, it can be filled regardless of the position of the handwheel 8, and therefore, the mechanical brake
The entry of rainwater and dust can be more effectively prevented without affecting the braking characteristics of the key 9.

In the embodiment shown in FIG. 2, the seal member 50 is a ring-shaped plate member, but may be an O-ring. Alternatively, when the seal member 50 is held by the braking ratchet 24,
The outer peripheral surface of the sealing material 50 may be brought into sliding contact with the circular peripheral surface 30 a of the cover portion 30.
An annular groove may be provided in Oa so that the outer peripheral surface of the seal member 50 protrudes into the annular groove, and the sealing is performed by a labyrinth effect. In this case, the width dimension of the annular groove is slightly longer than the axial movement width of the handwheel 8.

Next, a third embodiment shown in FIG. 3 will be described.
In the third embodiment, a first cylindrical portion 31 extending inward in the axial direction with respect to the boss portion 24b is provided on the outer peripheral portion of the braking ratchet wheel 24, similarly to the embodiment shown in FIGS. The boss 2
4b, a second tubular portion 51 extending axially outward is provided,
With the peripheral surface of the second cylindrical portion 51 facing the circular peripheral surface 30a of the cover portion 30, an O-ring is provided between the circular peripheral surface 30a and the circular facing peripheral surface 30b of the second cylindrical portion 51. A sealing member 52 held by the second tubular portion 51, and an inner peripheral surface 31a of the first tubular portion 31 and a flange of the driven member 22 opposed to the inner peripheral surface 31a. A sealing material 53 made of an O-ring and held on the flange 22a is interposed between the outer peripheral surface 22b and the outer peripheral surface 22b of the flange 22a.

By doing so, the mechanical brake
The lining plates 25, 26 constituting the key 9, and the intrusion of rainwater and dust into the respective braking surfaces of the braking pawl 24, the driven member 22, and the handwheel 8, which are opposed to each other, can be reliably prevented. . In any of the above-described embodiments, the cover 3 is attached to the boss 8a of the handwheel 8.
0, and the circular peripheral surface 30a thereof is
Or the circular opposing peripheral surface 3b of the second cylindrical portion 51 provided on the braking ratchet wheel 24.
0b or a sealing material 50 or 52 is interposed. However, as in the fourth embodiment shown in FIG. The boss portion 8a is provided with a circular opposing peripheral surface 30b facing the circular peripheral surface 30a of the cover portion 30, so that the circular peripheral surface 30a and the circular opposing peripheral surface 30b are brought close to each other or a sealing material is interposed. Is also good.

The drive shaft 7 has its axially intermediate portion supported by the load sheave 3 via the bearing 41. However, as in the fifth embodiment shown in FIG.
The support shaft portion 71 may be formed by extending the handwheel-side shaft end of the drive shaft 7 while holding the radial bearing 60 on the support shaft 15, and the support shaft portion 71 may be supported by the bearing 60. . In this case, a wheel stopper 61 is inserted into the support shaft 71, the wheel stopper 61 is engaged with the outer ring 60 a of the radial bearing 60, and the retaining ring 62 prevents the wheel stopper 61 from coming off. Further, in this embodiment, a bearing with a seal is used as the radial bearing 60, and a receiving recess 8b for inserting the wheel stopper 61 into the boss portion 8a of the hand wheel 8 is provided.
By bringing the inner peripheral surface of the drive wheel 7 close to the outer peripheral surface of the cylindrical portion of the wheel stopper 61, or by interposing a sealing material between the inner and outer peripheral surfaces, the screw shaft of the drive shaft 7 into which the handwheel 8 is screwed Rainwater and the like can be prevented from entering.

[0032]

According to the first aspect of the present invention, the cover 30 is provided on one of the handwheel 8 and the braking ratchet wheel 24, and the circular peripheral surface 30a of the cover 30 and the handwheel 8 are provided. And the other side of the braking ratchet wheel 24, and the circular peripheral surface 30a is opposed to the circular opposing peripheral surface 30b, so that rainwater and dust can be generated between the braking ratchet wheel 24 and the hand wheel 8. It is possible to prevent the interposed lining plate 26 and the lining plate 26 from entering between the opposing braking ratchet wheel 24 and the braking surface of the handwheel 8, so that the braking characteristics of the mechanical brake can be reduced. It is possible to avoid a change in the braking and braking release characteristics of the mechanical brake due to rainwater and dust entering without affecting.

According to the second aspect of the present invention, a seal member 50 or 52 is provided between the circular peripheral surface 30a of the cover portion 30 and the circular opposing peripheral surface 30b opposed to the circular peripheral surface 30a. Therefore, it is possible to more effectively prevent rainwater and dust from entering without affecting the braking characteristics of the mechanical brake.

According to the third aspect of the present invention, the outer peripheral portion of the braking ratchet wheel 24 extends inward in the axial direction with respect to the boss portion 24b, and is disposed between the driven member 22 and the braking ratchet wheel 24. Since the cylindrical portion 31 that covers the interposed lining plate 25 is provided, rainwater or dust is also present between the lining plate 25 and the braking surface of the driven member 22 and the braking ratchet wheel 24 facing the lining plate 25. Can be suppressed from invading, and a change in the braking characteristics of the mechanical brake can be more effectively avoided.

According to the fourth aspect of the present invention, the cylindrical portion 31 of the braking ratchet wheel 24 is provided on the outer peripheral surface 2 of the driven member 22.
2b so as to cover the outer peripheral surface 22b and the cylindrical portion 31.
Between the lining plate 25 and the braking surfaces of the braking ratchet wheel 24 and the driven member 22, which are opposed to the lining plate 25. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a manual chain block of the present invention.

FIG. 2 is a sectional view of a main part of a second embodiment.

FIG. 3 is a sectional view of a main part of a third embodiment.

FIG. 4 is a sectional view of a main part of a fourth embodiment.

FIG. 5 is a sectional view of a main part of a fifth embodiment.

[Explanation of symbols]

1, 2 side plate 3
Load sheave 7 Drive shaft 8
Hand wheel 9 Mechanical brake 22
Driven member 24 braking pawl 25,2
6 lining plate 28 braking claw 30
Cover part 30a Circular peripheral surface 30b
Circular facing surface 31 Cylindrical part 50, 5
2,53 Sealing material

Claims (4)

(57) [Claims] 1. A load sheave (3) supported between side plates (1) and (2), a drive shaft (7) for driving the load sheave (3), and coupled to the drive shaft (7). A driven member (22), a hand wheel (8) screwed to the drive shaft (7), a braking ratchet (24) having a tooth portion (4a) on the outer peripheral portion, and the braking ratchet (24). A hand chain (8); a braking chain wheel (25); and a manual chain block provided with lining plates (25) and (26) engaging with the teeth (24a) of the (24). (24), one of which extends toward the other, and is connected to the braking pawl (2).
4) a cover portion (30) having a circular peripheral surface (30a) covering the lining plate (26) located on the outside in the axial direction;
The other of the handwheel (8) and the braking ratchet (24) is provided with a circular facing peripheral surface (30b) facing the circular peripheral surface (30a) of the cover portion (30). (3
0) of the circular peripheral surface (30a).
b) a manual chain block which is adjacent to b). 2. A circular peripheral surface (30a) of the cover part (30).
2. The manual chain block according to claim 1, wherein a seal member is provided between the circular peripheral surface and the circular peripheral surface facing the circular peripheral surface. 3. A driven member (22) that extends axially inward with respect to a boss (24b) on an outer peripheral portion of a braking ratchet (24).
And a cylindrical portion (31) for covering the lining plate (25) interposed between the brake device and the braking ratchet (24).
The tooth portion (24) with which the braking claw (28) engages with the outer peripheral surface of 1).
The manual chain block according to claim 1 or 2, wherein a) is provided. 4. A cylindrical portion (31) of the braking ratchet (24) covers an outer peripheral surface (22b) of the driven member (22), and the outer peripheral surface (22b) and the cylindrical portion (31). Inner circumference (3
4. A sealing material (53) is provided between the sealing material (1) and (a).
Manual chain block as described.