JP2597292B2 - Manual chain block - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a manual chain block,
More specifically, the present invention relates to a manual chain block which supports a load sheave, which is driven in conjunction with a manual driving mechanism having a hand wheel, between a pair of side plates so as to freely rotate.

[0002]

2. Description of the Related Art Conventionally, in a manual chain block, a load sheave is rotatably supported between a pair of side plates as shown in, for example, Japanese Utility Model Publication No. 2-6071. The hook is connected to the load side of the load chain wound around the load sheave while being linked to a manual drive mechanism composed of a wheel and a hand chain.
Wheel cover 100 for covering the drive mechanism as shown in FIG.
Are fixed by tightening nuts to the three stay bolts 101.

The wheel cover 100 has a conduction opening 1 on both left and right sides as viewed from the front thereof, through which an endless hand chain which is hung on a hand wheel and operated manually is conducted.
02 and 103 are provided, and the stay bolt 1 is provided.
Each of the tightening portions 105 having the insertion holes 104 is provided with a hand chain guide 107 which extends the cover side wall 106 of the wheel cover 100 and turns the extended portion to be formed integrally with the cover side wall 106. The hand chain guide 107 guides the hand chain to the hand wheel so that a smooth pulling operation can be performed.
The wheel cover can be reinforced.

[0004]

However, since the hand chain guide 107 in the above conventional example is formed by folding back the cover side wall 106 of the wheel cover 100 and integrally forming the same, the processing of the wheel cover 106 is performed. There is a problem that the processability is poor and sufficient processing accuracy cannot be obtained.

That is, the wheel cover 100 is a large part, and the hand chain guide 107 is formed by folding the cover side wall 106 to the stay bolt tightening portion side. Not only increases but also the processing accuracy cannot be sufficiently obtained.

The above-mentioned publication also states that the hand chain guide 107 may be formed integrally with the cover side wall of the wheel cover 100, or may be welded to the wheel cover 100 separately from the wheel cover 100. But
In the case where the hand chain guide 107 is formed separately and fixed to the wheel cover 100 by welding, the hand chain guide 107 is used for the wheel cover.
Even if the hand chain guide 107 is held between the inner side surface and the side plate, the hand chain guide 107 does not sufficiently reinforce the wheel cover 100, and also requires a welding step. However, there is a problem that the performance is remarkably deteriorated, and the above-mentioned problem in the integral formation cannot be solved.

An object of the present invention is to improve the assemblability of the hand chain guide into the wheel cover and to improve the workability of the wheel cover while sufficiently reinforcing the wheel cover with the hand chain guide. The present invention is directed to smoothly guiding a hand chain to a hand wheel so that a pull operation of the hand chain can be smoothly performed.

[0008]

In order to achieve the above object, the invention according to claim 1 is directed to a pair of side plates 1 and 2.
A load sheave 3, which is rotatably supported between the two, and winds a load chain, and a drive mechanism 20, which is provided outside one of the side plates 1 and has a handwheel 8 for driving the load sheave 3, The drive mechanism 2 is attached to the side plate 1 through a plurality of stay bolts 12.
In the manual chain block provided with the wheel cover 15 covering the wheel cover 0, the mounting portion 44a interposed between the fastening portion of the stay bolt 12 of the wheel cover 15 and the stay bolt 12 is engaged with the side plate 1. A holding portion 44b to be held; and a guide portion 44c located between the attachment portion 44a and the holding portion 44b, facing the handwheel 8, and guiding the hand chain 40 hung on the handwheel 8. A hand chain guide 44 is provided, and the hand chain guide 44 is clamped between the side plate 1 and the tightened portion of the wheel cover 15 by tightening the stay bolt 12.

According to the second aspect of the present invention, the outer surface of the mounting portion 44a of the hand chain guide 44 has a shape that matches the inner surface of the cover side wall 15a in the fastening portion of the wheel cover 15. The invention according to claim 3 is
The guide portion 44c of the hand chain guide 44 has bulging portions 44d and 44e toward the opposite wheel flanges 8a and 8b of the hand wheel 8, and these bulging portions 44d and 44e.
Are opposed to the wheel flanges 8a and 8b at intervals smaller than the chain width of the hand chain 40.
The guide passage 45 of the hand chain 40 is formed between the guide chains 45a and 8b.

According to a fourth aspect of the present invention, the hand chain guide is formed of a vibration-proof material such as cast iron or aluminum. The vibration isolating layer 48 is formed on the surface of the hand wheel 8 at least by the guide portion 44c. Further, the invention according to claim 6 is characterized in that the mounting portion 44a of the hand chain guide 44 and the fastening portion of the wheel cover 15 are connected. The vibration absorbing material 49 was interposed between them.

In the invention according to claim 7, the mounting portion 44a of the hand chain guide 44 is fixed to the tightening portion of the wheel cover 15 mainly by spot welding.
The invention according to claim 8 is characterized in that the hand chain guide 4
No. 4 holding portion 44b has a projection 44g protruding from its end.
The projection 44g is fitted into a fitting hole 46 provided in the side plate 1 to lock and hold the holding portion 44b to the side plate 1.

[0012]

According to the first aspect of the present invention, the hand chain guide 44 is formed by the mounting portion 44a, the holding portion 44b, and the guide portion 44c.
Is interposed between the stay bolt tightening portion of the wheel cover 15 and the stay bolt 12, and the holding portion 44b is engaged and held by the side plate 1. Even without this, the stay bolt 12 can be firmly clamped and fixed between the tightened portion of the wheel cover 15 and the side plate 1 without being displaced by the tightening of the stay bolt 12, and the clamp is fixed without welding. Since the hand chain guide 44 is formed separately from the wheel cover 15 and is clamped and fixed as described above, the assembling property can be improved.
Since the workability of No. 5 can be improved and the processing accuracy thereof can be improved, and the mounting portion 44a is interposed between the tightening portion and the stay bolt 12, and is fixedly fixed.
The assembly accuracy can be improved without shifting the assembly position.

In addition, the hand chain guide 44 is
The mounting portion 44a is provided, interposed between the tightening portion and the stay bolt 12, and the holding portion 44b is engaged and held on the side plate 1, so that the cover side wall 15a of the wheel cover 15 is A box cross-section can be formed between the side plate 1 and the wheel cover 15 by the hand chain guide 44.

According to the second aspect of the present invention, the outer surface of the mounting portion 44a is covered with the cover side wall 1 of the fastening portion.
5a, the outer surface of the mounting portion 44a comes into contact with or close to the inner surface of the cover side wall 15a. Therefore, when an external impact is applied, the cover side wall 15a is Even if an attempt is made to deform inward, the impact is carried by the highly rigid stay bolt 12 via the attachment portion 44a of the hand chain guide 44, and the deformation of the wheel cover 15 can be effectively suppressed. The reinforcing performance of the foil cover 15 can be further improved.

According to the third aspect of the present invention, since the guide passage 45 is formed in the guide portion 44c, even if the hand chain 40 jumps in the wheel cover 15, it is possible to separate from the hand wheel 8. This can prevent the hand chain 40 from being pulled smoothly.

Further, according to the fourth aspect of the present invention, since the hand chain guide 44 is formed of an anti-vibration material, generation of abnormal noise can be suppressed even if the hand chain 40 comes into contact with the hand chain guide 44. According to the fifth aspect of the present invention, since the vibration isolating layer 48 is formed on the guide portion 44c, generation of abnormal noise can be suppressed even when the hand chain 40 comes into contact, as in the case where the vibration isolating material is used.

Further, in the invention according to claim 6, since the vibration absorbing material 49 such as rubber packing is interposed between the mounting portion 44a and the tightening portion of the wheel cover 15, the hand chain guide 44 is , It is possible to prevent the wheel cover 15 from resonating and generating an unpleasant noise. Further, in the invention according to claim 7, the mounting portion 44a of the hand chain guide 44 is fixed to the tightened portion of the wheel cover 15 by spot welding, so that the hand chain guide 44 is connected to the wheel cover 15 and the side plate 1. Intervention workability at the time of intervening can be improved, and the fixing is performed by the hand chain guide 44 due to the fixing.
Is not intended to reinforce the foil cover 15 by merely connecting it so as not to separate it.
While the assembling property can be improved, the wheel cover 15 can be sufficiently reinforced by the above-described fixing.

Further, the invention according to claim 8 is characterized in that the holding portion 4
4b is provided with the protrusion 44g, and the protrusion 44g is fitted into a fitting hole 46 provided in the side plate 1 to engage and hold the holding portion 44b with the side plate 1. Engagement and holding to the side plate 1 can be performed firmly, and the box section formed by the cover side wall 15a, the side plate 1 and the hand chain guide 44 can be further strengthened. Reinforcement can be performed more reliably.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The manual chain block shown in the figure is a manual lifting chain block, and a load chain (not shown) is installed between a pair of side plates 1 and 2 as shown in FIG. 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 an endless hand chain 40 is hung on 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 is provided at the other axial end of the drive shaft 7. Is provided with a gear reduction mechanism 11 having a plurality of reduction gears. The driving force of the handwheel 8 in the hand chain causes the driving force to be transmitted to the load sheave 3 via the transmission mechanism 10 and the gear reduction mechanism 11.
And a hanging tool (not shown) composed of a hook or the like connected to the load side of the load chain hung on the load sheave 3 can be wound up or down. The side plates 1 and 2 are fixed at predetermined intervals by three stay bolts 12,
A mounting shaft 14 for mounting the hook 13 is mounted above one side of the load sheave 3 in the tangential direction between the two side plates 1 and 2.

A wheel cover 15 for covering the handle wheel 8 is attached to the side plate 1, and a gear cover 16 for covering the gear reduction mechanism 11 is attached to the side plate 2. , And is fixed by a nut 17 screwed to the stay bolt 12. The wheel cover 15 and the gear cover 16 include:
Radial bearings 18 and 19 of the drive shaft 7 are provided. Both ends of the drive shaft 7 in the axial direction are independent of the load sheave 3 by the bearings 18 and 19 so that the covers 15 and 16 are provided independently.
A predetermined gap is held between the drive shaft 7 and the shaft hole of the load sheave 3 rotatably supported by the side plates 1 and 2 via bearings 5 and 6 so as to be freely rotatable. I have.

The hand chain 40, the hand wheel 8 and the transmission mechanism 10 constitute a manual drive mechanism 20. In the embodiment shown in FIG. 3, an overload prevention mechanism 21 is provided.

The transmission mechanism 10 includes a driven hub 22 which is connected to the drive shaft 7 so as not to rotate relatively (screw connection in the drawing), and a drive member 23 which is screwed to the drive shaft 7.
A reverse rotation preventing gear 24 interposed between the flange portions of the driven hub 22 and the driving member 23 and rotatably supported by the driven hub 22;
And lining plates 25 and 26 interposed between the anti-reverse gear 24 and the driving member 23.
A reverse rotation preventing claw 27 meshing with the reverse rotation preventing gear 24 is pivotally connected to the first side plate 1 via a claw shaft 28 so that the reverse rotation preventing claw 27, the reverse rotation preventing gear 24, and the driven hub 22. And the driving member 23 and the lining plate 25,
26 constitute the mechanical brake 9.

The overload prevention mechanism 21 is provided on the cylindrical boss 23a of the driving member 23 with the handwheel 8
Is rotatably supported in the forward rotation direction via a one-way clutch 29, and a lining plate 30 is provided between a flange portion of the driving member 23 and a boss portion of the handwheel 8. A lining plate 31, a pressing plate 32 co-rotating with the cylindrical boss portion 23a, and an elastic body 33 made of a disc spring are sequentially inserted and fitted on the outside of the handwheel 8 in the cylindrical boss portion. Outside of 33,
A load setting adjusting body 34 for adjusting the pressing force of the elastic body 33 to set the load at which the handwheel 8 slips with respect to the driving member 23 is screwed.

The gear reduction mechanism 11 further includes a first gear 35 formed integrally with the shaft end of the drive shaft 7,
A pair of second gears 37, 37 meshed with the gear 35 and supported by the intermediate shafts 36, 36, and a pair of third gears 38, 38 provided on the intermediate shafts 36, 36 and the load sheave 3; A fourth gear 39 is connected to the extension and meshes with the third gears 38.

In FIG. 3, reference numeral 41 denotes the driving member 2;
3 is a wheel stopper interposed between the axial end face 3 and the outer ring 18a of the radial bearing 18, and regulates the limit of the axial movement of the hand wheel 8 via the driving member 23. Reference numeral 42 denotes a pawl spring that urges the reverse rotation preventing claw 27 in the direction of the reverse rotation preventing gear 24, and reference numeral 43 denotes a chain key that regulates the inclination of the load chain that meshes with the load sheave 3.

In the above structure, when the handwheel 40 is operated to rotate the handwheel 8 in the normal direction, the driving force is transmitted via the transmission mechanism 10 having the overload prevention mechanism 21 and the mechanical brake 9. The shaft 7 is driven, and the drive is transmitted to the load sheave 3 via the gear reduction mechanism 11 to drive and rotate the load sheave 3, and the load side of the load sheave that is hung on the load sheave 3, The load side on which the load is hung can be lifted, and the load can be unloaded.

When a load exceeding the slip load set by the adjusting body 34 of the overload prevention mechanism 21 acts on the load side during the unloading of the load, the handwheel 8
Slips against the drive member 23, further unloading is stopped, and the unloading position thus unloaded is:
It is held by the action of the mechanical brake 9.

The unloading of the unloaded cargo is performed by operating the hand chain 40 to drive the hand wheel 8 in the reverse direction, and the drive member 23 is driven by the reverse rotation of the hand wheel 8. Retreat,
The load sheave 3 is reversed by repeating the operation and non-operation of the mechanical brake 9, so that the unloading of the load can be gradually performed.

The present invention relates to a manual chain block constructed as described above, as shown in FIGS. 1, 2 and 4 and 5, wherein the fastening portions 15n and 15p of the wheel cover 15 and the stay bolt 12 are connected. Bolt insertion hole 44i interposed between
A mounting portion 44a having a holding portion, a holding portion 44b engaged with and held by the side plate 1, and a position between the mounting portion 44a and the holding portion 44b, facing the handwheel 8,
A hand chain guide 44 having a guide portion 44c for guiding the hand chain 40 hung on the hand wheel 8 is provided separately from the wheel cover 8, and the hand chain guide 8 is fixed to the mounting portion 44a by the fastening. Insertion part 15
Then, the nut 17 is fastened to the stay bolt 12 by intervening between the side plates 1 and 15p, thereby being clamped and fixed between the side plate 1 and the fastening portions 15n and 15p of the wheel cover 15.

The wheel cover 15 is located radially outward from the outer peripheral surface of the hand wheel 8 as shown in FIGS. The upper part 15d having the upper part 15a and the opening 15b for conduction of the hand chain 40 are provided on both left and right sides as viewed from the front.
15c, the left and right side portions 15e and 15f along the outer peripheral portion of the handwheel 8, and these side portions 15e and 15f.
f, projecting radially downward and outward with respect to the outer peripheral portion of the handwheel 8, seating on a seating surface 53 of a cover holder 50 described later, and being bolted together by the stay bolt 12. It has a shape having a hole 15g and a lower fastening portion 15h.

The lower fastening portion 15h of the wheel cover 15 is continuous with the side portions 15e and 15f forming the conduction openings 15b and 15c, and has a short length having a circular arc-shaped cross section. An engaging piece 15i is provided, and the radial bearing 1 is provided inside the center of the wheel cover 15.
A concave portion 15j for holding the annular member 8 is provided, and an annular rib 15k and a reinforcing rib 15r extending radially outward from the annular rib 15k are provided outside the concave portion 15j.

The upper side 1 of the foil cover 15
5d has through holes 15m for the stay bolts 12 at the left and right corners thereof.
The nut 17 is screwed into the stay bolt 12 at three places, with the lower tightening portion 15h provided on the lower side of the wheel cover 15 at upper portions 15n and 15p of the nut 17 screwed into the nut 17. And a corner of the upper part 15d and the side parts 15e,
The upper edge portions 15n and 15p
And the upper fastening portion 15
n, 15p and reinforcing rib 1 continuous with lower fastening portion 15h
5x and 15y are provided.

The hand chain guide 44 shown in FIGS. 1, 2 and 4 and 5 is mainly formed using a thick iron plate, and the mounting portion 44a is formed as shown in FIG. Upper cover parts 15n, 15p of wheel cover 8
, An arc-shaped outer surface corresponding to the inner surface of the cover side wall 15a is formed, and the mounting portion 44a is connected to the tightening portions 15n, 15n.
As shown in FIG. 5, the outer surface of the attachment 44a contacts the inner surface of the cover side wall 15a, or is so close to the contact as to come into contact with the inner surface of the cover side wall 15a when interposed between the p and the step 12a of the stay bolt 12. It does. And the guide part 44c is
The bulging portions 44d, 4 bulging toward the opposite wheel flanges 8a, 8b of the hand wheel 8 with respect to the mounting portion 44a.
4e and a concave portion 44f recessed into the bulging portions 44d, 44e, and the bulging portions 44d, 44e are provided on the outer peripheral surfaces of the wheel flanges 8a, 8b as shown in FIG. The guide path 45 of the hand chain 40 is formed between the bulging portions 44d and 44e and the concave portion 44f and the wheel flanges 8a and 8b so as to face each other at an interval smaller than the chain width of the chain 40.

Further, the holding portion 44b is provided with the bulging portion 44e.
The end plate has a projection 44g protruding in the direction of the side plate 1, and the side plate 1 is provided with a fitting hole 46 for receiving the projection 44g.
The projection 44g is fitted into the fitting hole 46 so as to be able to engage and hold the side plate 1.

The concave portion 44 in the guide portion 44c
Although it is preferable that the outer surface of f contacts the stay bolt 12, a slight gap may be formed. Also,
It is preferable that the end face of the holding portion 44b be pressed against the side plate 1 by tightening the nut 17 to the stay bolt 12, but there may be some gap when engaging and holding by the projection 44g.

Further, the cover for coupling said lower tightening portion 15h to the side plate 1 - retainer 50, Fig. 8
As shown in FIG. 3, the stay is formed in a stay shape having side surfaces 51 and 52 forming the lower opening edges of the conduction openings 15b and 15c.
And a cover receiving portion 55 having a seating surface 53 on which the inner surface of the lower fastening portion 15h is seated and an R-shaped engaging surface 54 with which the inner surface of the engaging piece 15i is engaged. On the other side in the direction, a pair of square projections 56 and 57 that fit into a pair of square fitting holes 47 formed in the first side plate 1 are provided, and the seat 53 is inserted through the stay bolt 12. A hole 53a is provided, and the stay bolt 12 is inserted through the inside of the side surfaces 51 and 52 and protrudes from the insertion hole 53a and the insertion hole 15g of the lower tightening portion 15h. The cover 15 can be fixed to the first side plate 1 by tightening together with the cover 15.

Thus, the lower side of the wheel cover 15 allows the inner surface of the lower fastening portion 15h to be seated on the seating surface 53 of the cover holder 50 and the cover cover.
The inner surface of the engagement piece 15i is engaged with the engagement surface 54 of the cover receiving portion 55, and the cover holder 50 is shared with the wheel cover 15 by tightening the nut 17 screwed to the stay bolt 12. It can be fixed to the first side plate 1 by tightening, and the upper part 15d of the wheel cover 15 makes the end face of the cover side wall 15a contact the first side plate 1 and tightens the upper part. Part 1
As shown in FIG. 2 and FIG. 5, hand chain guides 44, 44 are interposed inside the 5n and 15p, and the cover 17 is tightened with the nut 17 into the stay bolt 12.
5a is pressed against the first side plate 1, and the hand chain guides 44,
The first and second side plates 1 and 2 can be fixed to the first side plate 1 so as to be sandwiched between the inner surfaces of the n and 15p and the first side plate 1.

On the other hand, the hand chain guides 44, 44 are clamped and fixed to the upper tightening portions 15n, 15p by tightening the nut 17 to the stay bolts 12, so that the hand chain guides 44, 44 are fixed. The hand chain 40 can correctly guide the hand chain 40 with respect to the hand wheel 8 so that the hand chain 40 can be smoothly pulled. Further, each hand chain guide 44 connects the mounting portion 44a to the fastening portion 15n, 15p and the stepped portion 12a of the stay bolt 12, and its outer surface is covered with the side wall 15a of the cover 15n, 15p.
Abuts or approaches the inner surface of the
Is engaged with the side plate 1 so that the cover
A box cross-section can be formed between the side wall 15a and the side plate 1, and the wheel cover 15 can be strongly reinforced. Even when an external impact is applied, the foil cover 15 is supported by the highly rigid stay bolt 12 via the mounting portion 44a. Therefore, the deformation of the foil cover 15 can be effectively suppressed.

Further, the mounting portion 44a is connected to the tightening portion 1
5n, 15p and the step 12a of the stay bolt 12, and the protrusion 44g is inserted into the fitting hole 4 of the side plate 1.
6, it can be simply assembled and retained, while the above-mentioned sufficient reinforcement can be performed, and its assemblability can be simplified.
Further, the hand chain guide 44 is connected to the wheel cover 15.
Since it is provided separately, the workability of the wheel cover 15 can be improved, and since the hand chain guide 44 is a small component, the processing accuracy can be improved, and the mounting part 44a can be connected to the fastening parts 15n, 15p. And stay bolt 12
And the stepped portion 12a is interposed and fixed, so that the assembling accuracy is improved and no positional displacement occurs.

The hand chain guide 44 is formed of a thick iron plate as described above, and is formed of a vibration-proof material such as cast iron, aluminum, or synthetic resin. This can be effectively suppressed.

FIG. 7 shows the entire surface of the hand chain guide 44 or at least the surface facing the hand wheel 8 side.
As shown in FIG. 3, the hand chain 40 is formed by forming an anti-vibration layer 48 by coating with a synthetic resin or the like.
Can effectively suppress the generation of abnormal noise due to the contact of the user.

Further, as shown in FIG.
By interposing a vibration absorbing material 49 such as a rubber packing between a and the tightening portions 15n, 15p, even if the hand chain 40 comes into contact with the hand chain guide 44, the wheel cover 15 resonates and is uncomfortable. It is possible to prevent occurrence of abnormal noise.

The hand chain guide 44 causes the mounting portion 44a to intervene between the fastening portions 15n and 15p and the stay bolt 12, and the projection 4 of the holding portion 44b.
4g can be easily assembled by fitting the fitting portion 44a into the fitting hole 46 of the side plate 1.
By fixing to 5n and 15p mainly by spot welding, the assemblability can be further improved.

In the above-described embodiment, the manual drive mechanism 20 incorporates the overload prevention mechanism 21. However, the overload prevention mechanism 21 is not necessarily required. The gear reduction mechanism 11 may not be provided.

Furthermore, the radial bearing 1 in which the drive shaft 7 has both axial ends at the wheel cover 15 and the gear cover 16 is provided.
8 and 19, it may be supported by the load sheave 3, or one end in the axial direction may be supported by one of the wheel cover 15 and the gear cover 16, and the intermediate shaft may be supported by the load sheave 3. Good.

[0046]

According to the first aspect of the present invention, the hand chain guide 44 is connected to the mounting portion 44a and the holding portion 44.
formed by the b and the guide portion 44c, moreover, the tightening portion of the stay bolt the mounting portion 44a in the Hoirukaba -15, so as to interposed between the Suteboru bets 12, and the holding portion 44b The side plate 1
The stay cover 12 is tightened by the stay bolt 12 without welding.
Can be firmly clamped and fixed without displacement between the tightening portion and the side plate 1 and can be clamped and fixed without welding, so that the assemblability can be improved and the hand chain guide 44 can be improved. Is formed separately from the foil cover 15 and is clamped and fixed as described above, so that the workability of the foil cover 15 can be improved, and the processing accuracy thereof can be improved. Since it is interposed and fixed between the fastening portion and the stay bolt 12, the assembling accuracy can be improved without shifting the assembling position.

In addition, the hand chain guide 44 is
The mounting portion 44a is provided, interposed between the tightening portion and the stay bolt 12, and the holding portion 44b is engaged and held on the side plate 1, so that the cover side wall 15a of the wheel cover 15 is A box cross-section can be formed between the side plate 1 and the wheel cover 15 by the hand chain guide 44.

According to the second aspect of the present invention, the outer surface of the mounting portion 44a is covered with the side wall 1 of the fastening portion.
5a, the outer surface of the mounting portion 44a comes into contact with or close to the inner surface of the cover side wall 15a. Therefore, when an external impact is applied, the cover side wall 15a is Even if an attempt is made to deform inward, the impact is carried by the highly rigid stay bolt 12 via the attachment portion 44a of the hand chain guide 44, and the deformation of the wheel cover 15 can be effectively suppressed. The reinforcing performance of the foil cover 15 can be further improved.

According to the third aspect of the present invention, since the guide passage 45 is formed in the guide portion 44c, even if the hand chain 40 jumps in the wheel cover 15, it is possible to remove the hand chain 40 from the hand wheel 8. This can prevent the hand chain 40 from being pulled smoothly.

Further, according to the fourth aspect of the present invention, since the hand chain guide 44 is formed of an anti-vibration material, generation of abnormal noise can be suppressed even when the hand chain 40 comes into contact with the hand chain guide 44. According to the fifth aspect of the present invention, since the vibration isolating layer 48 is formed on the guide portion 44c, generation of abnormal noise can be suppressed even when the hand chain 40 comes into contact, as in the case where the vibration isolating material is used.

According to the sixth aspect of the present invention, since the vibration absorbing material 49 such as rubber packing is interposed between the mounting portion 44a and the tightening portion of the wheel cover 15, the hand chain guide 44 is , It is possible to prevent the wheel cover 15 from resonating and generating an unpleasant noise. Further, in the invention according to claim 7, the mounting portion 44a of the hand chain guide 44 is fixed to the tightened portion of the wheel cover 15 by spot welding, so that the hand chain guide 44 is connected to the wheel cover 15 and the side plate 1. Intervention workability at the time of intervening can be improved, and the fixing is performed by the hand chain guide 44 due to the fixing.
Is not intended to reinforce the foil cover 15 by merely connecting it so as not to separate it.
While the assembling property can be improved, the wheel cover 15 can be sufficiently reinforced by the above-described fixing.

The invention according to claim 8 is characterized in that:
4b is provided with the protrusion 44g, and the protrusion 44g is fitted into a fitting hole 46 provided in the side plate 1 to engage and hold the holding portion 44b with the side plate 1. Engagement and holding to the side plate 1 can be performed firmly, and the box section formed by the cover side wall 15a, the side plate 1 and the hand chain guide 44 can be further strengthened. Reinforcement can be performed more reliably.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention, in which hooks are omitted.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is an overall longitudinal sectional view of the embodiment shown in FIG. 1;

FIG. 4 is a perspective view of a wheel cover.

FIG. 5 is a perspective view of a hand chain guide.

FIG. 6 is a plan view of a hand chain guide.

FIG. 7 is a sectional view showing another embodiment of the hand chain guide.

FIG. 8 is a perspective view of a cover holder.

FIG. 9 is an explanatory view showing a conventional example.

[Explanation of symbols]

1, 2 side plate 3
Road sheave 8 Hand wheel 8a, 8b
Foil tsuba 12 Stay bolt 15
Wheel cover 15a Cover side wall 20
Drive mechanism 40 Hand chain 44
Hand chain guide 44a Mounting part 44b
Holder 44c Guide 44d
Swelling part 44e Swelling part 44g
Projection 45 Guide passage 46
Fitting hole 48 Anti-vibration layer 49
Vibration absorber

Continued on the front page (56) References Japanese Utility Model Sho 55-27247 (JP, U) Japanese Utility Model Sho 51-78578 (JP, U) Japanese Utility Model Sho 58-12594 (JP, U) Japanese Utility Model Sho 48-85356 (JP) , U) Jingoji 47-12270 (JP, Y2) Jigyo 2-6071 (JP, Y2)

Claims (8)

(57) [Claims] 1. A load sheave (3) rotatably supported between a pair of side plates (1) and (2) for winding a load chain, and disposed outside one of the side plates (1), A drive mechanism (20) having a hand wheel (8) for driving the load sheave (3); and a drive mechanism (20) attached to one side plate (1) via a plurality of stay bolts (12). Foil cover (1)
5) a mounting portion (44a) interposed between a stay bolt (12) fastening portion and a stay bolt (12) of the wheel cover (15); and the side plate. (1) a holding portion (44b) engaged and held, and the handwheel (8) positioned between the mounting portion (44a) and the holding portion (44b).
A hand chain guide (44) having a guide portion (44c) for guiding a hand chain (40) hung on the hand wheel (8), and the hand chain guide (44) is attached to the stay. A manual chain block which is clamped between the side plate (1) and a tightened portion of the wheel cover (15) by tightening a bolt (12). 2. The mounting portion (44a) of the hand chain guide (44) has an outer surface corresponding to the inner surface of the cover side wall (15a) in the fastening portion of the wheel cover (15). Manual chain block. 3. The guide portion (44c) of the hand chain guide (44) has a swelling portion (44d) (44) facing the opposite wheel flange (8a) (8b) of the hand wheel (8).
e), the bulges (44d) and (44e) are opposed to the wheel flanges (8a) and (8b) at intervals smaller than the chain width of the hand chain (40). The manual chain block according to claim 1, wherein a guide passage (45) for the hand chain (40) is formed between the manual chain block and the guide chain (8b). 4. The manual chain block according to claim 1, wherein the hand chain guide (44) is formed of a vibration-proof material. 5. The manual chain block according to claim 1, wherein a vibration isolating layer (48) is formed on at least a surface of the hand chain guide (44) on a side of the hand wheel (8) in the guide portion (44c). . 6. Between a mounting portion (44a) of the hand chain guide (44) and a tightening portion of the wheel cover (15).
The manual chain block according to claim 1, further comprising a vibration absorber (49). 7. The manual chain block according to claim 1, wherein the mounting portion (44a) of the hand chain guide (44) is fixed to the fastening portion of the wheel cover (15). 8. The holding portion (44b) of the hand chain guide (44) includes a projection (44g) projecting from an end portion.
The manual chain block according to claim 1, wherein the side plate (1) is provided with a fitting hole (46) for receiving the projection (44g).