JPH0717692A - Manual chain block - Google Patents

Abstract

PURPOSE:To improve operability of a drive mechanism and further to improve durability while transmitting efficiency can be improved by decreasing axial deflection and deformation in a drive mechanism side shaft part of a drive shaft. CONSTITUTION:A radial bearing 18 for supporting an axial direction one end part of a drive shaft 7 is provided in a wheel cover 15, and a drive mechanism side shaft part for supporting a drive mechanism 20 to the drive shaft 7 is extended to support a shaft end part of this drive mechanism side shaft part to the radial bearing 18, so that axial deflection of the drive mechanism 20 at drive operating time is decreased to eliminate axial deformation.

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 in which a load sheave, which is driven in conjunction with a manual drive mechanism having a handwheel, is rotatably supported between a pair of side plates.

[0002]

2. Description of the Related Art Conventionally, a manual chain block, for example, as disclosed in Japanese Utility Model Publication No. 62-16477, and as shown in FIG. 13, a load sheave 103 is provided between a pair of side frames 101 and 102. It is rotatably supported, and the drive shaft 104 is inserted into the shaft hole of the load sheave 103.
A handle wheel 105 constituting a drive mechanism is screwed to one side in the axial direction of the drive shaft 104, and a driven hub 106 is connected to the inside thereof, and a flange portion of the driven hub 106 and the hand wheel 105 are connected to each other. Reverse rotation prevention gear 10 between
7, a pair of lining plates 108 and 109 are interposed, and a reverse rotation preventing pawl 110 that meshes with the reverse rotation preventing gear 107 is pivotally mounted on the side frame 101 to provide a transmission mechanism 111 having a mechanical brake. It is known that a gear reduction mechanism 112 is provided on the other side of the drive shaft 104 in the axial direction.

In the above structure, the transmission mechanism 111 and the handwheel 1 are attached to the side plate 101.
No. 05, a wheel cover 113 is provided, and the side plate 102 is provided with a gear cover 114 that covers the gear reduction mechanism 112.
Are integrally connected to the side plates 101 and 102 by a hook, a hook 116 is mounted above the side plates 101 and 102 via a mounting shaft 117, and a chain scraper 118 is mounted below the side plate 101 and 102. .

By the way, the drive shaft 104 configured as described above is rotatably supported at one axial end extending outward from the side plate 102 by a radial bearing 119 attached to the gear cover 113. Further, the other axial end extending outward from the side plate 101 is in a free state, and the handwheel 10 is attached to the axial end.
5 is screwed on, and the intermediate shaft portion has a radial bearing 121.
Is supported by the shaft hole of the load sheave 103, and the transmission mechanism 111 and the handwheel 105 are incorporated on the outer side of the support portion.

In FIG. 13, reference numeral 122 is a stopper for limiting the axial movement of the handwheel 105 in the loosening direction. Therefore, by operating an endless hand chain (not shown) hung on the handwheel 105, the handwheel 105 is screwed to move the transmission mechanism 1
The drive force transmitted from the hand chain to the hand wheel 105 via 11 is transmitted to the drive shaft 104, and is transmitted to the rotor sheave 103 via the gear reduction mechanism 112.
A load chain (not shown) hung on the load sheave 103 can be hoisted to unload a load, and a mechanical break can hold the unloading position.
In addition, reverse operation of the hand chain allows unloading via the mechanical brake.

[0006]

However, in the above conventional structure, since the intermediate shaft portion of the drive shaft 104 is supported by the load sheave 103 by the bearing 121, the bearing 121 is the load sheave 103. It is necessary to mount the bearing 12 in a limited small annular gap between the inner peripheral surface of the shaft hole and the outer peripheral surface of the drive shaft 104 inserted into the shaft hole. Therefore, the size and type of the bearing 12 are restricted, Since only bearings having low bearing efficiency such as needle bearings or metal bearings can be applied, there is a problem that the transmission efficiency to the load sheave 103 becomes poor and the operating force by the hand chain becomes heavy, and the drive shaft 104 is driven. Since the mechanism side is cantilevered without bearing and the handwheel 105 is attached to the free end portion thereof,
When driving the handwheel 105 with the hand chain,
There is also a problem that the drive shaft 104 is bent by the load acting on the handwheel 105, and if an excessive hand chain operation is performed, bending stress is concentrated and deformed outside the bearing portion with the load sheave 103.

Further, when the drive shaft 104 is bent or deformed, the hand wheel 105 is moved to the wheel cover-1.
13 and the members such as the chain guides provided on the inner surface of the foil cover-113 will come into contact with the inner surface of the wheel cover 113, and as a result, not only will there be a problem that the transmission efficiency will be further deteriorated, but also the durability will be reduced and uncomfortable. The problem of producing sound arises.

A main object of the present invention is to improve the transmission efficiency by reducing the shaft bending and deformation of the drive mechanism side shaft portion of the drive shaft, improve the operability of the drive mechanism, and improve the durability. Another object is to further improve the bearing efficiency and further improve the transmission efficiency.

[0009]

In order to achieve the above object, the invention according to claim 1 has a pair of first and second side plates 1 and 2 and a shaft hole 3a, and each side plate 1 , A load sheave 3 which is rotatably supported between the two,
A drive mechanism 20 having a handwheel 8, a drive shaft 7 that penetrates the shaft hole 3a of the load sheave 3, and one end side in the axial direction is interlocked with the drive mechanism 20, and is driven by the drive mechanism 20, and the drive shaft 7. A wheel cover 15 for covering the drive mechanism 20 is provided on the first side plate 1, and a gear cover for covering the gear reduction mechanism 11 is provided. In the manual chain block 16 attached to the second side plate 2, a radial bearing 18 for supporting one end portion in the axial direction of the drive shaft 7 is provided on the wheel cover 15 side, and the drive shaft 7 is The drive mechanism side shaft portion that supports the drive mechanism 20 is extended, and the shaft end portion is the radial bearing 18
Supported.

According to the second aspect of the present invention, radial bearings 19 are provided not only on the side of the wheel cover 15 but also on the side of the gear cover 16, and both axial ends of the drive shaft 7 are loaded by the bearings 18, 19. Independent of the sheave 103,
The load sheave 3 is rotatably supported by the wheel cover 15 and the gear cover 16, and the load sheave 3 maintains a predetermined distance between the inner peripheral surface of the shaft hole 3a and the outer peripheral surface of the drive shaft 7. And the second side plates 1 and 2 are rotatably supported.

The invention according to claim 3 is the drive mechanism 2.
No. 0 is provided with a mechanical brake, and the drive shaft 7 has a screw shaft portion 71 for screwing a drive portion which rotates in conjunction with the handwheel 8 and a support shaft portion 72 supported by the bearing 18 of the wheel cover 15. The support shaft portion 72 is provided with a restriction portion 41 that faces the outer ring 18a of the bearing 18 held by the wheel cover 15 and that restricts axial movement by contact with the outer ring 18a, and the handwheel. The wheel stopper 40 having the receiving portion 42 for receiving the axial movement of 8 is inserted and held.

Further, the invention according to claim 4 is the support shaft portion 7.
2 has a smaller diameter than the screw shaft portion 71, and a receiving step portion 74 is provided between the screw shaft portion 71 and the support shaft portion 72, and the wheel stopper is provided outside the holding portion of the wheel stopper body 40 in the support shaft portion 72. The retaining body 43 of the body 40 is provided.

According to a fifth aspect of the present invention, the wheel cover 15 and the gear cover 16 and their respective covers-15, 16 are provided.
A positioning body for setting the position of each of the covers-15, 16 with respect to the side plates 1, 2 between the mounting first and second side plates 1, 2, and a positioning recess for fitting and positioning the positioning body. And provided.

The invention according to claim 6 is a foil cover.
The fifteen is constituted by a recess 58 for holding the bearing 18, an annular rib 59 surrounding the recess 58, and a plurality of reinforcing ribs 60 extending radially from the annular rib 59.

Further, in the invention as set forth in claim 7, the reinforcing ribs 60 radially extending from the annular rib 59 are directed toward the fixing portion by the stay bolt 12, and are terminated at this fixing portion.

[0016]

In the invention described in claim 1, the foil cover-1
The radial bearing 18 is provided on the fifth side, and the bearing 18 supports the drive mechanism side shaft portion of the drive shaft 7 that supports the drive mechanism 20, so that the support strength of the drive shaft 7 can be improved. When the handwheel 8 of the drive mechanism 20 is driven and operated by the hand chain, the shaft deflection can be reduced and the shaft deformation can be prevented even if a large operation load is applied to the drive shaft 7. The transmission efficiency of the driving force transmitted to the load sheave 3 can be improved,
The operability can be improved, and the handwheel 8
It is possible to solve the problem caused by the contact with the chain guide or the wheel cover.

According to the second aspect of the present invention, the radial bearing 18, the wheel cover 15 and the gear cover 16 are provided.
19 are provided, and both end portions in the axial direction of the drive shaft 7 are connected to the wheel cover 15 and the gear cover via the bearings 18 and 19.
Since the bearings 18 and 19 are supported separately from the support system of the load sheave 3, each of the bearings 18 and 19 has a good bearing efficiency, for example, a ball bearing or the like and has an arbitrary size. Therefore, the bearing efficiency can be increased, and the transmission efficiency can be further improved. Moreover, since the drive shaft 7 supports both ends in the axial direction in a cantilever manner, the load of driving operation of the handwheel 8 can be increased. Even if a large load is applied to the drive shaft 7, the shaft deflection can be reduced and the shaft deformation can be prevented, so that the transmission efficiency can be further improved in combination with the improvement of the bearing efficiency and the handwheel The operability can be improved.

Further, according to the third aspect of the invention, since the wheel stopper 43 is inserted and held in the support shaft portion 72 of the drive shaft 7, the axial movement of the hand wheel 8 is controlled by the radial bearing. It is received by the foil cover 15 via the outer ring 18a of 18 and therefore the foil cover 15a.
It is possible to restrict the axial movement of the handwheel 8 in the screw retreating direction with a small deformation of 15, that is, the axial movement restriction during overwinding, and to compare the structure with a conventional example in which a castle nut is used for the restriction. Easy to use and drive shaft 7
Since it is simply inserted into the drive shaft 7, the assembling property to the drive shaft 7 can be simplified, and the wheel stopper 40 can be formed by the restricting portion 41 and the receiving portion 42. As in the example, since it can be formed by the flanged tubular member, it has good workability and can reduce the cost.

In the invention according to claim 4, since the retaining member 43 is provided outside the holding portion of the wheel stopper 40 in the drive shaft 7, the wheel cover 8 is removed and the drive shaft 7 is supported by the bearing 18. The wheel stopper 40 can be retained on the drive shaft 7 even when the wheel stopper 15 is detached from the drive shaft 7, and therefore, when the wheel stopper 15 is detached during the disassembly, the wheel stopper 15 is reassembled. The possibility of forgetting to incorporate the wheel stopper 40 can be eliminated, and the wheel stopper 40 can be used when the axial movement of the bearing 18 is restricted via the outer ring 18a, especially when the wheel is overwound.
Even if the load acting on the wheel cover 15 becomes excessively large and the wheel cover 15 is deformed, the retaining member 43 can restrict the axial movement of the hand wheel 8, and thus the deformation of the wheel cover 15 can be suppressed. The axial movement regulation can be effectively performed in cooperation with the wheel cover 15.

In the invention according to claim 5, since the positioning body and the positioning recess are provided between the wheel cover 15 and the gear cover 16, and the first and second side plates 1 and 2, the wheel cover is formed. When the -15 and the gear cover 16 are attached to the side plates 1 and 2, the positions of the bearings 18 and 19 can be set based on the side plates 1 and 2, and therefore, the load supported by the side plates 1 and 2 can be set. The shaft center of the drive shaft 7 and the shaft center of the sheave 3 can be accurately matched.

Further, according to the invention of claim 6, the wheel cover 15 is provided with the recess 58, the annular rib 59 and a plurality of radially extending reinforcing ribs 60. Therefore, the weight of the wheel cover 15 is increased. Therefore, the rigidity of the drive shaft 7 can be increased, and therefore the position of the bearing 18 provided on the wheel cover 15 can be secured even when an external impact is applied, which impairs the rotatability of the drive shaft 7 due to the displacement of the bearing 18. It can be prevented from being done.

Further, in the invention according to claim 7, since the reinforcing ribs 60 are provided so as to extend to the fixing portion by the stay bolts 12 for fixing the wheel cover 15 to the first side plate 1, an impact load from the outside is provided. Foil Cover-1
5, even if it is applied to the bearing 1 by the stay bolt 12
It is possible to secure the position of No. 8 and prevent the displacement of the bearing 18 more favorably.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The manual chain block shown in FIG. 1 is a manual lifting type chain block, and a load sheave 3 for hanging a load chain 4 between a pair of first and second side plates 1 and 2. Is rotatably supported via bearings 5 and 6, a drive shaft 7 is inserted into the shaft hole of the load sheave 1, and an endless hand chain 80 is hung on one end side in the axial direction thereof. A wheel 8 is provided, and a mechanical brake 9 is provided between the hand wheel 8 and the drive shaft 7.
And a gear reduction mechanism 11 having a plurality of reduction gears at the other axial end of the drive shaft 7.
The driving force is transmitted to the load sheave 3 via the transmission mechanism 10 and the gear reduction mechanism 11 by the driving operation of the handwheel 8 in the hand chain, and the load chain 4 hung on the load sheave 3 is provided. A suspending tool (not shown) including a hook and the like connected to the load side of the device can be hoisted or hoisted.
The side plates 1 and 2 have three stay bolts 12
Are fixed at a predetermined interval by means of, and a mounting shaft 14 for mounting the hook 13 is mounted above the load sheave 3 on the one side in the tangential direction between the 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. It is fixed by a nut 17 screwed to the stay bolt 12.

The hand chain and hand wheel 8
The transmission mechanism 10 constitutes the drive mechanism 20, and is provided with the overload prevention mechanism 21 in the embodiment shown in FIGS.

The transmission mechanism 10 includes a driven hub 22 which is fixed to the drive shaft 7 such that it cannot rotate relative to the drive shaft 7 (screw connection in the drawing), and a drive member 23 which is screwed to the drive shaft 7.
A reverse rotation preventing gear 24, which is interposed between the flange portions of the driven hub 22 and the driving member 23 and is rotatably supported by the driven hub 22, and the driven hub 22 and the reverse rotation preventing gear 24.
And the reverse rotation prevention gear 24 and the drive member 23, and the lining plates 25 and 26,
The side plate 1 is biased by the reverse rotation preventing gear 24 by a claw spring 44, and a reverse rotation preventing claw 27 that meshes with the reverse rotation preventing gear 24 is pivotally mounted via a claw shaft 28 so as to be swingable. The pawl 27, the reverse rotation preventing gear 24, the driven hub 22, the drive member 23, and the lining plates 25 and 26 constitute the mechanical brake 9.

Further, the overload preventing mechanism 21 has the tubular boss portion 23a of the driving member 23 and the handwheel 8 attached thereto.
Is rotatably supported in the normal rotation driving direction via a one-way clutch 29, and a lining plate 30 is provided between the flange portion of the driving member 23 and the boss portion of the handwheel 8 to prevent the driving member 23 from moving. On the outer side of the handwheel 8 in the tubular boss portion, a lining plate 31, a holding plate 32 that rotates together with the tubular boss portion 23a, and an elastic body 33 composed of a disc spring are sequentially inserted and fitted. Outside 33
A load setting adjuster 34 for adjusting the pressing force of the elastic body 33 and setting the load at which the handwheel 8 slips on the drive member 23 is screwed.

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

In the above construction, however, when the hand chain is operated to drive the hand wheel 8 in the normal direction, the drive shaft is driven through the transmission mechanism 10 having the overload prevention mechanism 21 and the mechanical brake 9. 7 is driven, and this 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 1 hung on the load sheave 3, that is, the tip end. With a hook on the side, the load side for hanging the load can be rolled up to unload the load.

Further, when a load exceeding a slip load set by the adjusting body 34 of the overload preventing mechanism 21 is applied to 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 to drive the handwheel 8 in the reverse direction, and the drive member 23 is screwed by the reverse drive of the handwheel 8. It is possible to reverse the load sheave 3 by repeating the action and non-action of the mechanical brake 9 so that the load can be gradually unloaded.

The embodiment shown in FIG. 1 is a manual chain block constructed as described above, wherein the foil cover-1 is used.
5 and the gear cover 16 at the location facing the drive shaft 7,
Radial bearings 18 consisting mainly of ball bearings,
19 is provided, and both axial end portions of the drive shaft 7 are rotatably supported by the bearings 18 and 19 independently of the load sheave 3, and the shaft hole of the load sheave 3 and the drive shaft 7 are provided. A predetermined gap was maintained between them.

That is, the drive shaft 7 is connected to the drive mechanism 20.
The drive mechanism side shaft portion that supports the drive mechanism side shaft portion is extended to the radial bearing 18, and in the embodiment shown in FIG. 1, the drive mechanism side shaft portion is attached to the handwheel 8. The drive member 23 and the driven hub 22 that rotate in conjunction with each other
And a support shaft portion 72 formed by extending to an axially outer end portion of the screw shaft portion 71. The shaft end portion of the support shaft portion 72 is formed into the radial bearing 18 described above.
Support.

The other axial end of the drive shaft 7 in which the gear reduction mechanism 11 of the drive shaft 7 is assembled is also the first
A support shaft portion 73 is provided on the outer side of the gear 35 in the axial direction, and the support shaft portion 73 is supported by the radial bearing 19. The drive shaft 7 has both axial end portions thereof that are the wheel cover 15 and the gear cover. 16 is supported in a cantilever manner, and the predetermined gap is held between the intermediate shaft portion of the drive shaft 7 and the shaft hole 3a of the load sheave 3.
It will be supported in a contactless manner independently of the support system of.

Therefore, the supporting strength of the drive shaft 7 can be improved, and when the handwheel 8 of the drive mechanism 20 is driven by a hand chain, the shaft deflection is reduced even when a large operation load is applied to the drive shaft 7. In addition, the shaft deformation can be prevented, the transmission efficiency of the driving force transmitted from the handwheel 8 to the load sheave 3 can be improved, the operability thereof can be improved, and the shaft deflection can be reduced. Since the deformation can be prevented, it is possible to solve the problem that the handwheel 8 comes into contact with the wheel cover or the chain guide provided inside the wheel cover to generate abnormal noise or reduce the durability. Moreover, in the embodiment shown in FIG. 1, both end portions of the drive shaft 7 in the axial direction are connected to the wheel cover-1.
5 and the bearings 18 and 19 provided on the gear cover 16 can be used as the bearings 18 and 19 in the form of ball bearings or the like having good bearing efficiency, and bearings of any size can be applied. The transmission efficiency can be further improved by increasing it.

In the embodiment shown in FIG. 1, the drive shaft 7 is provided with a support shaft portion 73 on the gear reduction mechanism side and is supported by the radial bearing 19 of the gear cover 16. The bearing 19 such as a needle bearing may be interposed between the load sheave 3 and the gear reduction mechanism side shaft hole, or the drive shaft 7 may be supported by forming a metal bearing portion. Also in this case, since the drive mechanism side shaft portion of the drive shaft 7 is supported by the radial bearing 18 provided in the wheel cover 15, the support strength of the drive mechanism side shaft portion supporting the drive mechanism 20 is improved, Shaft deflection can be reduced and shaft deformation can be prevented.

In the structure shown in FIG. 1, the shaft 3a and the drive shaft 7 on the drive mechanism side of the load sheave 3 are arranged.
A bearing portion which is not always in contact with but may be subjected to axial flexure of the drive mechanism side shaft portion may be provided between and. The bearings 18 and 19 may be directly attached to the covers -15 and 16, but may be attached to a frame frame fixed to the side plates 1 and 2.

Incidentally, the drive shaft 7 in the embodiment shown in FIG. 1 has the drive mechanism centered on the intermediate shaft portion 70 inserted into the shaft hole 3a of the load sheave 3 as shown in FIG. A side shaft portion and a gear reduction mechanism side shaft portion are provided, and the drive mechanism side shaft portion is configured by the screw shaft portion 71 and the support shaft portion 72, and the support shaft portion 72 is formed from the screw shaft portion 71. As a small diameter, a receiving step portion 74 is provided between the screw shaft portion 71 and the support shaft portion 72, and an insertion groove 75 for a retaining body 43, which will be described later, is provided at an intermediate portion of the support shaft portion 72. And
Further, the shaft portion on the gear reduction mechanism side is provided with the first gear 35 and a support shaft portion 73 having a diameter smaller than that of the first gear 35, and the first gear 35 is formed by cold forging to form a gear portion 35a. And the collar portion 35b are integrally formed. The support shaft portion 72 of the drive mechanism side shaft portion has the radial bearing 18 held by the wheel cover 15.
Of the drive member 23 that is opposed to the outer ring 18a and that restricts axial movement by contact with the outer ring 18a, and the drive member 23 that engages with the receiving step 74 and is screwed to the screw shaft 71. A receiving portion 4 for receiving the axial movement of the handwheel 8 via the
The wheel stopper 40 having 2 is inserted and held.

That is, as shown in FIG. 6, the foil stopper 40 used in the embodiment of FIG. 1 has a tubular member of a predetermined length provided with a flange portion extending in a trumpet shape on one side in the length direction. The regulating portion 41 is formed by the outer peripheral outer surface of the portion, and the receiving portion 42 is formed by the lengthwise inner side of the tubular member. The inner peripheral surface of the tubular member is not threaded but has a straight shape and is inserted into and retained by the support shaft portion 72. Further, the wheel stopper in the support shaft portion 72 is retained. On the outside of the holding portion of the body 40, there is provided a retaining body 43 which is mainly composed of a snap ring and is fixed to the insertion fitting groove 75, and the retaining body 43 detaches the wheel retaining body 40 axially outward. Has been blocked.

The wheel stopper 40 having the above construction is inserted into the support shaft portion 72, and the retaining member 43 is removed.
Since it is only stopped with, it is possible not only to simplify the processing as compared with the structure in which the castle nut is screwed onto the drive shaft and pinned as in the conventional example, but also the assemblability to the support shaft portion 72 is simplified. The cost can be reduced accordingly, and the drive member 23 having the handwheel 8 is provided.
Since the movement in the screw retracting direction can be received and regulated by the wheel cover 15 via the outer ring 18a of the bearing 18,
The deformation of the wheel cover 15 is small, and the movement of the drive member 23 in the screw retreating direction can be restricted, that is, the shaft movement can be restricted during overwinding.

Since the retaining member 43 is provided, the wheel retaining member 40 is retained on the drive shaft 7 even when the wheel cover 15 is removed and the drive shaft 7 is disengaged from the bearing 18. Therefore, if the wheel stopper 40 is detached during disassembly, there is no risk of forgetting to incorporate the wheel stopper 40 when reassembling the wheel cover 15, and the bearing 18 When the axial movement is restricted via the outer ring 18a of
Even when the wheel cover 15 is deformed due to an excessive load acting on the wheel stopper 40, especially when it is overwound, the second stopper 43 can secondarily restrict the axial movement. While the deformation of the wheel cover 15 can be suppressed, the axial movement restriction can be effectively performed in cooperation with the wheel cover 15.

Further, in the embodiment shown in FIGS. 1 and 6, since the wheel stopper 40 is formed by a tubular member having a predetermined length, the overload prevention as in the embodiment shown in FIG. Even when the mechanism 21 is configured, or when the boss portion of the handwheel 8 is screwed to the screw shaft portion 71 without configuring the overload prevention mechanism, the handwheel 8 can be commonly used, and the parts can be commonly used. And the handwheel 8
When the boss portion of the wheel is screwed onto the screw shaft portion 71, the wheel stopper 40 is used, and thus the axial movement of the wheel stopper 40 can be restricted without increasing the axial length of the boss portion. The processing can be simplified. Also,
Although a snap ring is used as the retaining body 43, a through pin may be used instead of this snap ring,
Further, as shown in FIG. 12, a spacer 81 and a castle nut 82 are used in place of the wheel stopper 40, and the nut 82 is screwed to the support shaft portion 72, and is connected to the support shaft portion 72 by a through pin 83. Alternatively, the wheel stopper 40 may be omitted and the driving member 23 or the boss portion of the handwheel 8 may be brought into direct contact with the bearing 18 or the wheel cover 15.

Next, as described above, the radial bearings 18, 19 are
The wheel cover 15 and the gear cover 16 that hold the above will be described. As shown in FIG. 8, the foil cover 15 has conducting openings 15a and 15b for conducting the hand chain on both left and right sides as viewed from the front, and these conducting openings 15a and 15b are provided between the conducting openings 15a and 15b. 15a, 15
A short side cover side wall 15c provided between b is engaged, and a cover holder 47 for fixing the cover side wall 15c to the first side plate 1 is provided, and the wheel cover-1 is provided.
A hand chain guide 48 is provided at the tightening portion 15d of the stay bolt 12 in FIG.

As shown in FIG. 7, the cover holder 47 has side surfaces 47a and 47b forming the lower opening edges of the conduction openings 15a and 15b and a seating surface on which the inner surface of the wheel cover 15 is seated. 47e, the foil cover-1
5, a cover receiving portion 47c for receiving 5 is provided.
The outer surface of the receiving portion 47c is rounded so that the cover side wall 15c holds the receiving portion 47c.
Further, on the end surface on the side of the first side plate 1, a pair of prismatic protrusions 47d which can be positioned by being fitted in a pair of prismatic fitting holes 49 formed in the side plate 1 are provided. The seating surface 47e on which the inner surface of −15 is seated is provided with an insertion hole 47f through which the stay bolt 12 that penetrates the inside of the side surfaces 47a and 47b penetrates.

As shown in FIGS. 9 and 11, the hand chain guide 48 includes the stay bolt 12 and the tightening portion 15d of the stay bolt 12 in the wheel cover 15.
2, the mounting portion 51 having an outer surface corresponding to the inner surface of the cover side wall 15e in the tightening portion 15d and having a bolt insertion hole 51a in the flat surface, and a square shape provided in the first side plate 1. A holding portion 53 that has a rectangular protrusion 53a that fits into the fitting hole 52 and is positionable, and is held by the side plate 1, and the mounting portion 51 and the holding portion 53.
And a guide portion 54 that is located between the two and faces the hand wheel 8 and guides the hand chain.

Thus, the cover holder 47 and the pair of hand chain guides 48, 48 are provided between the first side plate 1 and the wheel cover 15 by tightening the nut 17 on the stay bolt 12. The cover holder 47 and the hand chain guide 4 are fixed together.
The wheel cover 15 is fitted by fitting the respective rectangular protrusions 47d, 53a provided on the 8, 48 in the rectangular fitting holes 49, 52.
Is set with respect to the first side plate 1.

That is, the receiving portion 47 of the cover holder 47.
By making c cover the side wall 15c, the position of the cover holder 47 with respect to the wheel cover 15 is determined, and the attachment parts 51 of the hand chain guides 48, 48 project to the inner surface of the side wall 15e. By applying
Further, the positions of the hand chain guides 48, 48 with respect to the wheel cover 15 are determined by being fixed by spot welding or the like in the abutting state, and therefore, the cover holder 47 and the hand chain guides 48, 48 are fixed. The square protrusions 47d and 53a serve as positioning bodies, and the square fitting holes 49 and 52 provided in the first side plate 1 serve as positioning recesses into which the square protrusions 47d and 53a are fitted and positioned to form the wheel cover 15. It is positioned with respect to the first side plate 15 and can be fixed at a predetermined position by tightening the nut 17 into the stay bolt 12.

On the other hand, between the gear cover 16 and the second side plate 2 to which the gear cover 16 is attached, a positioning body mainly made up of knock pins for setting the position of the gear cover 16 with respect to the second side plate 2. 56 and a positioning recess 57 into which the positioning body 56 is fitted and positioned. The positioning body 5
6 is mainly provided on the gear cover 16 side and may be constructed by using a knock pin which is a member different from the gear cover 16, but as shown in FIGS. 1 and 5, the gear cover 16 is burred. Therefore, it is preferable to bulge in a semi-projection shape.

As described above, the positioning body and the positioning recess are provided between the wheel cover 15 and the gear cover 16 and the first and second side plates 1 and 2 on which the covers 15 and 15 are mounted. By positioning, the positions of the bearings 18 and 19 can be set on the basis of the side plates 1 and 2 supporting the load sheave 3, and therefore, the axis of the drive shaft 7 with respect to the axis of the load sheave 3 can be set. Can be accurately matched.

Further, as shown in FIG. 8, the wheel cover 15 has a concave portion 58 for holding the bearing 15, an annular rib 59 surrounding the concave portion 58, and the annular rib 5.
9 extends radially toward the tightening portion 15d by the stay bolt 12 and ends at the tightening portion. The reinforcing rib 60 and the upper tightening portion 15d of the wheel cover 15 are terminated.
Reinforcing ribs 85 continuous with the tightening portions 15d are provided between the tightening portions 15d and the lower tightening portions 15d, and the ribs 59, 60 and 85 and the recess 58 are formed. Thus, while the foil cover 15 is formed of a metal plate, the foil cover 15 is reinforced and prevents the bearing 18 held in the recess 58 from being displaced.

That is, the holding portion for holding the bearing 18 is
The stay 58 is reinforced by the recess 58, the annular rib 59, and the reinforcing rib 60 continuous with the annular rib 59, and is continuously connected to the stay bolt 12 via the reinforcing rib 60. Since the reinforcing ribs 85 are provided between the tightening portions 15d to be tightened, the displacement of the holding portion can be prevented or minimized even if a part is deformed due to external force. The axial center position of can be held.

Further, the gear cover 16 has a bulged central portion, and the bearing 19 and the bearings 61 and 62 of the intermediate shaft 36 are provided in the bulging portion 16a having enhanced resistance to strength as shown in FIG. Therefore, even if an external force is applied, it is possible to prevent the displacement of the bearing 19 set by the positioning body 56 and the positioning recess 57. Therefore, the drive shaft 7 supported by the wheel cover 15 and the gear cover 16 via the bearings 18 and 19 is the wheel cover-1.
5 and the gear cover 16 described above, the chain block is held at a predetermined axial center position even when an impact is applied from the outside, so that interference with the load sheave 3 due to axial misalignment can be avoided and the chain block has high durability. Can be configured.

In FIG. 2, 63 and 64 are load chain guides for guiding the load chain 4 entering between the side plates 1 and 2 to the load sheave 3, and 65 is arranged at a position directly below the load sheave 3. , A chain bar that enters between the side plates 1 and 2 to regulate the inclination of the load chain 4 that meshes with the load sheave 3 in the direction of entrance, and these load chain guides 63, 64 and chain bar 65 are side chains. The load chain guides 63 are fixed to each other between the plates 1 and 2, and the unloaded chain guide 63 of the load chain guides 63 and 64 is provided with a locking portion 66 that locks the unloaded side end of the load chain 4. There is.

Further, in the embodiment described above, the overload prevention mechanism 21 is incorporated in the drive mechanism 20, but this mechanism is not always necessary. When the overload prevention mechanism 21 is not provided, the boss portion of the handwheel 8 is screwed onto the screw shaft portion 71 of the drive shaft 7, as shown in FIG.

Although the radial bearings 18 and 19 are both directly held by the wheel cover 15 and the gear cover 16, they may be held by separately providing a fixing frame for fixing the side plates 1 and 2.

Further, since the radial bearing 18 is held in the recessed portion 58 of the wheel cover 15, the strength of the holding portion can be improved. However, like the radial bearing 19 of the gear cover 16, the cover is covered. -May be retained through the wall.

[0057]

According to the first aspect of the invention, the radial bearing 18 is provided on the wheel cover 15 side, and the bearing 18 supports the drive mechanism side shaft portion of the drive shaft 7 which supports the drive mechanism 20. Therefore, the support strength of the drive shaft 7 can be improved, and therefore the handwheel 8 of the drive mechanism 20 can be improved.
When the drive is operated by a hand chain, the drive shaft 7
Even if a large operation load is applied to the shaft, shaft deflection can be reduced and shaft deformation can be prevented. Therefore, the transmission efficiency of the driving force transmitted from the handwheel 8 to the load sheave 3 can be improved, and its operability is improved. Moreover, the problem caused by the hand wheel 8 coming into contact with the chain guide or the wheel cover can be solved.

According to the second aspect of the invention, the radial bearings 18, 15 are provided on the wheel cover 15 and the gear cover 16.
19 are provided, and both end portions in the axial direction of the drive shaft 7 are connected to the wheel cover 15 and the gear cover via the bearings 18 and 19.
Since the bearings 18 and 19 are supported separately from the support system of the load sheave 3, each of the bearings 18 and 19 has a good bearing efficiency, for example, a ball bearing or the like and has an arbitrary size. Therefore, the bearing efficiency can be increased, and the transmission efficiency can be further improved. Moreover, since the drive shaft 7 supports both ends in the axial direction in a cantilever manner, the load of driving operation of the handwheel 8 can be increased. Even if a large load is applied to the drive shaft 7, the shaft deflection can be reduced and the shaft deformation can be prevented, so that the transmission efficiency can be further improved in combination with the improvement of the bearing efficiency and the handwheel The operability can be improved.

Further, according to the third aspect of the invention, since the wheel stopper 43 is inserted and held on the support shaft portion 72 of the drive shaft 7, the axial movement of the hand wheel 8 is controlled by the radial bearing. It is received by the foil cover 15 via the outer ring 18a of 18 and therefore the foil cover 15a.
It is possible to restrict the axial movement of the handwheel 8 in the screw retreating direction with a small deformation of 15, that is, the axial movement restriction during overwinding, and to compare the structure with a conventional example in which a castle nut is used for the restriction. Easy to use and drive shaft 7
Since it is simply inserted into the drive shaft 7, the assembly to the drive shaft 7 can be simplified, and the wheel stopper 40 can be formed by the restricting portion 41 and the receiving portion 42, that is, the embodiment. As described above, since it can be formed by the flanged tubular member, the workability is good and the cost can be reduced.

According to the fourth aspect of the invention, since the retaining member 43 is provided outside the holding portion of the wheel stopper 40 in the drive shaft 7, the wheel cover 8 is removed and the drive shaft 7 is supported by the bearing 18. The wheel stopper 40 can be retained on the drive shaft 7 even when the wheel stopper 15 is detached from the drive shaft 7, and therefore, when the wheel stopper 15 is detached during the disassembly, the wheel stopper 15 is reassembled. The possibility of forgetting to incorporate the wheel stopper 40 can be eliminated, and the wheel stopper 40 can be used when the axial movement of the bearing 18 is restricted via the outer ring 18a, especially when the wheel is overwound.
Even if the load acting on the wheel cover 15 becomes excessively large and the wheel cover 15 is deformed, the retaining member 43 can restrict the axial movement of the hand wheel 8, and thus the deformation of the wheel cover 15 can be suppressed. The axial movement regulation can be effectively performed in cooperation with the wheel cover 15.

Further, in the invention according to claim 5, since the positioning body and the positioning recess are provided between the wheel cover 15 and the gear cover 16 and the first and second side plates 1 and 2, the wheel cover is formed. When the -15 and the gear cover 16 are attached to the side plates 1 and 2, the positions of the bearings 18 and 19 can be set on the basis of the side plates 1 and 2, so that the load supported by the side plates 1 and 2 can be set. The shaft center of the drive shaft 7 and the shaft center of the sheave 3 can be accurately matched.

Further, in the invention as set forth in claim 6, since the wheel cover 15 is provided with the annular rib 59 and a plurality of reinforcing ribs 60 extending in the radial direction, the wheel cover 15 is provided.
The rigidity can be increased without increasing the weight of
Since the position of the bearing 18 provided on the wheel cover 15 can be secured even when an external impact is applied, it is possible to prevent obstruction of the rotatability of the drive shaft 7 due to the displacement of the bearing 18.

Further, in the invention according to claim 7, since the reinforcing ribs 60 are provided so as to extend to the fixing portion by the stay bolts 12 for fixing the wheel cover 15 to the first side plate 1, an impact load from the outside is provided. Foil Cover-1
5, even if it is applied to the bearing 1 by the stay bolt 12
It is possible to secure the position of No. 8 and prevent the displacement of the bearing 18 more favorably.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a chain block of the present invention.

FIG. 2 is a cross-sectional view in which a center between side plates is vertically cut and a load chain is hung on a load sheave.

FIG. 3 is a front view of only a drive shaft.

FIG. 4 is a partial sectional view in which only the gear reduction mechanism is laterally sectioned.

FIG. 5 is an enlarged cross-sectional view showing a positioning structure for a gear cover and a second side plate.

FIG. 6 is an enlarged sectional view of only a wheel stopper.

FIG. 7 is a perspective view of a cover holder.

FIG. 8 is a front view of the wheel cover.

9 is a cross-sectional view taken along the line AA of FIG.

10 is a cross-sectional view of the foil cover taken along the line BB in FIG.

FIG. 11 is a perspective view of a hand chain guide.

FIG. 12 is a partial sectional view showing an embodiment in which an overload prevention mechanism is not provided.

FIG. 13 is a sectional view showing a conventional example.

[Explanation of symbols]

1 1st side plate 2 2nd side plate 3 load sheave 3a shaft hole 7 drive shaft 8 hand wheel 11 gear reduction mechanism 12 stay bolt 15 wheel cover 16 gear cover 18 radial bearing 18a outer ring 19 radial bearing 20 drive mechanism 40 wheel stopper 41 restriction portion 42 receiving portion 43 retaining body 56 positioning body 57 positioning recess 58 recessed portion 59 annular rib 60 reinforcing rib 71 screw shaft portion 72 support shaft portion 74 receiving step portion

Claims (7)

[Claims] 1. A load having a pair of first and second side plates (1) and (2) and a shaft hole (3a) and rotatably supported between the side plates (1) and (2). Drive mechanism (2) with sheave (3) and handwheel (8)
0) and the shaft hole (3a) of the load sheave (3), and one end side in the axial direction is interlocked with the drive mechanism (20),
Drive shaft (7) driven by this drive mechanism (20)
And a gear reduction mechanism (11) arranged on the other axial side of the drive shaft (7), and a wheel cover (15) covering the drive mechanism (20) includes the first side plate (1). ), And a gear cover (16) for covering the gear reduction mechanism (11) is attached to the second side plate (2), wherein the drive is provided on the wheel cover (15) side. A radial bearing (18) that supports one end of the shaft (7) in the axial direction is provided, and the drive shaft (7) extends the drive mechanism side shaft portion that supports the drive mechanism (20), and an extension shaft thereof. A manual chain block, characterized in that its end is supported by the radial bearing (18). 2. A wheel cover (15) side and a gear cover.
Radial bearings (18) and (19) that support the drive shaft (7) are provided on the (16) side, and both axial ends of the drive shaft (7) are the bearings (18).
(19) is rotatably supported by the wheel cover (15) and the gear cover (16) independently of the load sheave (3), and the load sheave (3) has an inner circumference of its shaft hole (3a). The manual type according to claim 1, wherein the surface is rotatably supported by the first and second side frames (1) and (2) with a predetermined distance maintained between the surface and the outer peripheral surface of the drive shaft (7). Chain block. 3. The drive mechanism (20) includes a mechanical brake (9), and the drive shaft (7) has a screw shaft portion (71) for screwing a drive portion which rotates in conjunction with the handwheel (8). When,
A support shaft portion (72) supported by a bearing (18) of the wheel cover (15), and an outer ring of the bearing (18) held by the wheel cover (15) on the support shaft portion (72). A restricting portion (41) that opposes (18a) and restricts axial movement by contact with the outer ring (18a), and a receiving portion (42) that receives axial movement of the handwheel (8). A manual chain block according to claim 1 or 2, wherein a wheel stopper (40) having the above is inserted and held. 4. The support shaft portion (72) has a smaller diameter than the screw shaft portion (71), and the screw shaft portion (71) and the support shaft portion (7).
2), a receiving step portion (74) is provided, and the retaining body (43) of the wheel stopper (40) is provided outside the holding portion of the wheel stopper (40) in the support shaft portion (72). The manual chain block according to claim 3, which is provided. 5. A wheel cover (15) and a gear cover.
The side plate (1) of each of the covers (15) and (16) is provided between the (16) and the first and second side plates (1) and (2) to which the covers (15) and (16) are attached.
The manual chain block according to claim 2, further comprising a positioning body that sets a position with respect to (2), and a positioning recess that is fitted and positioned by the positioning body. 6. The wheel cover (15) comprises a recess (58) for holding the bearing (18), an annular rib (59) surrounding the recess (58), and a plurality of radially extending ribs (59). 3. A manual chain block according to claim 1 and claim 2, comprising reinforcing ribs (60) according to claim 1. 7. Reinforcing ribs (60) extending radially from the annular rib (59) extend to a stay bolt fastening portion (15d) for fixing the wheel cover (15) to the first side plate (1), 7. The manual chain block according to claim 6, which ends at this tightening portion (15d).