JP2597290B2 - 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, as shown in FIG. 13, a load sheave 103 is provided between a pair of side frames 101 and 102. As shown in FIG. The drive shaft 104 is rotatably supported, and a drive shaft 104 is inserted into a shaft hole of the load sheave 103.
A handle wheel 105 constituting a drive mechanism is screwed to one side of the drive shaft 104 in the axial direction, and a driven hub 106 is coupled inside the handle wheel 105. A flange portion of the driven hub 106 and the hand wheel 105 are connected to each other. Between the reverse rotation prevention gear 10
7, a pair of lining plates 108 and 109 are interposed, and a reverse rotation preventing claw 110 meshing with the reverse rotation preventing gear 107 is pivotally mounted on the side frame 101 to transmit a transmission mechanism 111 having a mechanical brake. A gear reduction mechanism 112 is provided on the other side of the drive shaft 104 in the axial direction.

In the above construction, the transmission mechanism 111 and the handwheel 1 are attached to the side plate 101.
05 is provided. The side plate 102 is provided with a gear cover 114 which covers the gear reduction mechanism 112.
The hooks 116 are attached above the side plates 101 and 102 via an attachment shaft 117, and the chain bar 118 is attached below the side plates 101 and 102. .

The drive shaft 104 constructed as described above has one end in the axial direction extending outward from the side plate 102 rotatably supported by a radial bearing 119 attached to the gear cover-113. The other end in the axial direction extending outward from the side plate 101 is in a free state, and the handwheel 10
5 is screwed, and the intermediate shaft portion is a radial bearing 121.
Thus, the transmission mechanism 111 and the handwheel 105 are structured to be supported by the shaft hole of the load sheave 103 outside the support portion.

In FIG. 13, reference numeral 122 denotes a stopper for limiting the axial movement of the handwheel 105 in the relaxing direction. Therefore, by operating an endless hand chain (not shown) hung on the hand wheel 105, the hand wheel 105 is screwed, and the transmission mechanism 1 is driven.
11 transmits the driving force transmitted from the hand chain to the hand wheel 105 to the driving shaft 104 via the gear chain reduction mechanism 112, and transmits the driving force to the low toe sheave 103 via the gear reduction mechanism 112.
The load can be unloaded by winding up a load chain (not shown) that is hung on the load sheave 103, and the unloading position can be held by a mechanical brake.
In addition, the unloading can be performed via the mechanical brake by reversely operating the hand chain.

[0006]

However, in the above-described conventional structure, the intermediate shaft portion of the drive shaft 104 is supported by the load sheave 103 by the bearing 121. 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 to be inserted into the shaft hole. Therefore, the size and type of the bearing 12 are restricted. Only bearings with poor bearing efficiency, such as needle bearings or metal bearings, can be applied, and the transmission efficiency to the load sheave 103 deteriorates, which increases the operating force of the hand chain. Since the mechanism side is cantilevered without bearing, and the handwheel 105 is attached to its free end portion,
At the time of driving operation of the hand wheel 105 by the hand chain,
The load acting on the handwheel 105 causes the drive shaft 104 to bend, and if an unreasonable hand chain operation is performed, bending stress concentrates on the outer side of the bearing portion with the load sheave 103 to cause deformation.

When the drive shaft 104 is bent or deformed, the hand wheel 105 is moved to the wheel cover-1.
13 and a member such as a chain guide provided on the inner surface of the wheel cover-113. As a result, not only a problem that the transmission efficiency is further deteriorated, but also a decrease in durability or an unpleasant The problem of generating sound arises.

The main object of the present invention is to reduce the axial deflection and deformation of the drive mechanism side shaft portion of the drive shaft to improve the transmission efficiency, 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 present invention according to claim 1 has a pair of first and second side plates 1 and 2 and a shaft hole 3a. , 2, a load sheave 3 that is rotatably supported between
A drive mechanism 20 having a handwheel 8, a drive shaft 7 that penetrates the shaft hole 3 a of the load sheave 3, and is driven by the drive mechanism 20 at one axial end in conjunction with the drive mechanism 20. A gear reduction mechanism 11 disposed at the other axial end of the shaft 7, wherein a wheel cover 15 covering the drive mechanism 20 is provided on the first side plate 1, and a gear cover covering the gear reduction mechanism 11 is provided. Reference numeral 16 denotes a manual chain block attached to the second side plate 2, wherein a radial bearing 18 for supporting one axial end of the drive shaft 7 is provided on the wheel cover 15 side, and the drive shaft 7 is The drive mechanism side shaft supporting the drive mechanism 20 is extended, and its shaft end is connected to the radial bearing 18.
He supported it.

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

[0011] The invention according to claim 3 provides the driving mechanism 2
0, a mechanical brake, a drive shaft 7 having a screw shaft 71 for screwing a drive unit which rotates in conjunction with the handwheel 8, a support shaft 72 supported by a bearing 18 of the wheel cover 15; A restricting portion 41 which faces the outer ring 18a of the bearing 18 held by the wheel cover 15 and restricts axial movement by contact with the outer ring 18a; The wheel stopper 40 having the receiving part 42 for receiving the axial movement 8 is inserted and held.

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

The invention according to claim 5 is characterized in that the wheel cover 15 and the gear cover 16 and their respective covers 15, 16
A positioning body for setting the position of each of the covers 15 and 16 with respect to the side plates 1 and 2 between the first and second side plates 1 and 2 for mounting; and a positioning recess for fitting and positioning the positioning bodies. This was provided.

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

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

[0016]

According to the first aspect of the present invention, the foil cover-1
The radial bearing 18 is provided on the 5th 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 hand wheel 8 of the drive mechanism 20 is driven by a hand chain, even if a large operation load is applied to the drive shaft 7, shaft deflection can be reduced and shaft deformation can be prevented. 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
However, the problem caused by contact with the chain guide and 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, the two ends of the drive shaft 7 in the axial direction are connected to the wheel cover 15 and the gear cover via the bearings 18 and 19, respectively.
16 and a support system different from the support system of the load sheave 3, so that each of the bearings 18 and 19 is in the form of a ball bearing or the like having good bearing efficiency, and has an arbitrary size. And the transmission efficiency can be further improved by improving the bearing efficiency. In addition, since the drive shaft 7 supports both ends in the axial direction in a double-supported manner, the load of the driving operation of the handwheel 8 can be increased. Thus, even if a large load acts on the drive shaft 7, the shaft deflection can be reduced and the shaft deformation can be prevented, and the transmission efficiency can be further improved in conjunction with the improvement of the bearing efficiency. The operability can be improved.

According to the third aspect of the present 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. The wheel cover 15 is received by the wheel cover 15 through the outer ring 18a of the wheel 18 and therefore the wheel cover 15
The deformation of the handwheel 8 in the direction of screw retreat is small, that is, the shaft movement can be restricted in the overwinding state. The drive shaft 7
Is simply inserted into the drive shaft 7, the assemblability 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. Since it can be formed by a flanged cylindrical member as in the example, the workability is good and the cost can be reduced.

According to the fourth aspect of the present invention, since the retaining member 43 is provided on the drive shaft 7 outside the holding portion of the wheel stopper 40, the wheel cover 8 is removed and the drive shaft 7 is connected to the bearing 18. The wheel stopper 40 can be held on the drive shaft 7 even when disassembling the wheel cover 15, and therefore, when the wheel stopper 15 is detached during disassembly, the wheel cover 15 is reassembled when the wheel cover 15 is reassembled. It is possible to eliminate the risk of forgetting to assemble the wheel stoppers 40, and to control the axial movement via the outer ring 18a of the bearing 18, particularly when the wheel stoppers 40 are overwound.
Even when the load acting on the wheel cover 15 is excessively deformed and the wheel cover 15 is deformed, the axial movement of the hand wheel 8 can be restricted by the retaining member 43, so that the deformation of the wheel cover 15 can be suppressed. The shaft movement restriction can be effectively performed in cooperation with the wheel cover 15.

According to the fifth aspect of the present invention, since the positioning member 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 provided. 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 axis of the drive shaft 7 can be accurately matched with the axis of the sheave 3.

Further, according to the present invention, since the wheel cover 15 is provided with the concave portion 58, the annular rib 59 and the plurality of reinforcing ribs 60 extending in the radial direction, the weight of the wheel cover 15 is increased. Therefore, even if an external impact is applied, the position of the bearing 18 provided on the wheel cover 15 can be secured, and the rotation of the drive shaft 7 due to the displacement of the bearing 18 is impeded. Can be prevented beforehand.

According to the seventh aspect of the present invention, since the reinforcing ribs 60 are provided so as to extend to a portion fixed by the stay bolts 12 for fixing the wheel cover 15 to the first side plate 1, an external impact load is provided. Is foil cover-1
5 and the bearing 1 by the stay bolt 12.
8 can be secured, and the displacement of the bearing 18 can be prevented more favorably.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A manual chain block shown in FIG. 1 is a manual lifting chain block, and a load sheave 3 for mounting a load chain 4 between a pair of first and second side plates 1 and 2. FIG. 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 80 is hung on one end side in the axial direction. 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 hand wheel 8 in the hand chain, and the load chain 4 hung on the load sheave 3 is provided. A hanging tool (not shown) composed of a hook or the like connected to the load side of the vehicle can be wound up or down.
The side plates 1 and 2 have three stay bolts 12.
A mounting shaft 14 for mounting the hook 13 is mounted above the 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 hand chain and the hand wheel 8
The transmission mechanism 10 constitutes a drive mechanism 20, and includes an overload prevention mechanism 21 in the embodiment shown in FIGS.

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.
The side plate 1 is urged against the reverse rotation preventing gear 24 by a pawl spring 44, and a reverse rotation preventing claw 27 meshing with the reverse rotation preventing gear 24 is pivotally connected via a pawl shaft 28 so as to be swingable. The mechanical brake 9 is constituted by the pawl 27, the reverse rotation preventing gear 24, the driven hub 22, the driving member 23, and the lining plates 25, 26.

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 the above configuration, when the hand wheel 8 is driven to rotate forward by operating the hand chain, the drive shaft is driven via the transmission mechanism 10 having the overload prevention mechanism 21 and the mechanical brake 9. 7 is driven, and the driving is transmitted to the load sheave 3 via the gear reduction mechanism 11 to drive and rotate the load sheave 3, that is, the load side of the load sheave 1 hooked 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 is turned off.
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 and driving the hand wheel 8 in the reverse direction. The driving member 23 is screwed by the reverse driving of the hand wheel 8. 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 embodiment shown in FIG. 1 is a manual chain block constructed as described above, wherein the wheel cover-1 is used.
5 and the gear cover 16 are opposed to the drive shaft 7,
Radial bearings 18, mainly composed of ball bearings,
19 is provided, and both ends in the axial direction of the drive shaft 7 are rotatably supported by the bearings 18 and 19 independently of the load sheave 3, so that the shaft hole of the load sheave 3 and the drive shaft 7 A predetermined gap was held between them.

That is, the drive shaft 7 is connected to the drive mechanism 20.
The drive mechanism-side shaft portion supporting the shaft is extended, and the extended shaft portion is supported by the radial bearing 18. In the embodiment shown in FIG. 1, the drive mechanism-side shaft portion is connected to the handwheel 8. Drive member 23 and driven hub 22 that rotate in conjunction with each other
, And a support shaft 72 extending from an axially outer end of the screw shaft 71. The shaft end of the support shaft 72 is connected to the radial bearing 18.
I support it.

The other end in the axial direction of the drive shaft 7 into which the gear reduction mechanism 11 of the drive shaft 7 is incorporated is also the first end.
A support shaft 73 is provided on the outside of the gear 35 in the axial direction, and the support shaft 73 is supported by the radial bearing 19. Both ends of the drive shaft 7 in the axial direction are the wheel cover 15 and the gear cover. 16, 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, and the load sheave 3
Is supported in a non-contact state independently of the supporting system.

Therefore, the support strength of the drive shaft 7 can be improved, and when the hand wheel 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. It is possible to prevent shaft deformation and improve the transmission efficiency of the driving force transmitted from the handwheel 8 to the load sheave 3, improve the operability thereof, reduce the shaft deflection, and reduce the shaft deformation. Since the deformation can be prevented, the problem that the hand wheel 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 can be solved. Moreover, in the embodiment shown in FIG. 1, both ends of the drive shaft 7 in the axial direction are
Since the bearings 18 and 19 provided on the gear 5 and the gear cover 16 are supported, the bearings 18 and 19 may be ball bearings having good bearing efficiency and any size bearings. It is possible to improve the transmission efficiency by increasing it.

In the embodiment shown in FIG. 1, a support shaft 73 is provided on the drive shaft 7 on the side of the gear reduction mechanism and is supported by the radial bearing 19 of the gear cover 16. 19 may be eliminated and a bearing such as a needle bearing may be interposed between the load sheave 3 and the shaft hole on the gear reduction mechanism side, or a metal bearing portion may be formed on the drive shaft 7 to support it. Also in this case, the drive mechanism side shaft portion of the drive shaft 7 is supported by the radial bearing 18 provided on the wheel cover 15, so that 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, a shaft hole 3a and a drive shaft 7 on the drive mechanism side of the load sheave 3 are provided.
And a bearing part which does not always contact, but which receives shaft deflection of the drive mechanism side shaft part. The bearings 18 and 19 may be directly mounted on the covers 15 and 16 or may be mounted on frame frames fixed to the side plates 1 and 2.

The drive shaft 7 in the embodiment shown in FIG. 1 has the drive mechanism 7 centered on an intermediate shaft 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 includes the screw shaft portion 71 and the support shaft portion 72, and the support shaft portion 72 is separated from the screw shaft portion 71. As a small diameter, a receiving step 74 is provided between the screw shaft 71 and the support shaft 72, and an insertion groove 75 of the retaining member 43 described later is provided in an intermediate portion of the support shaft 72. And
The first gear 35 and a support shaft 73 smaller in diameter than the first gear 35 are provided on the shaft portion on the side of the gear reduction mechanism, and the first gear 35 is formed by cold forging to form a gear 35a. And the flange 35b are integrally formed. The support shaft portion 72 of the drive mechanism side shaft portion includes the radial bearing 18 held by the wheel cover 15.
And a driving member 23 which engages with the receiving step 74 and is screwed to the screw shaft 71 by opposing the outer ring 18a and restricting axial movement by contact with the outer ring 18a. Receiving portion 4 for receiving the axial movement of the handwheel 8 through the
2 is inserted and held.

That is, as shown in FIG. 6, the foil stopper 40 used in the embodiment shown in FIG. 1 is provided with a flange portion extending in a trumpet shape on one side in the longitudinal direction of a cylindrical member having a predetermined length. The restricting portion 41 is formed by the outer peripheral outer surface of the portion, and the receiving portion 42 is formed by the inside of the cylindrical member in the longitudinal direction. Further, the inner peripheral surface of the cylindrical member is not threaded, but is formed in a straight shape, and is inserted into and held by the support shaft portion 72. Outside the holding portion of the body 40, there is provided a retaining body 43 mainly composed of a snap ring, which is secured to the insertion groove 75, and the retaining body 43 separates the wheel stopper 40 outward in the axial direction. Has been blocked.

The wheel stopper 40 having the above structure is inserted into the support shaft 72 and the stopper 43 is inserted.
In this case, the machining can be simplified as compared with the structure in which the castle nut is screwed to the drive shaft and pinned as in the conventional example, and the assemblability to the support shaft 72 can be simplified. The cost can be reduced accordingly, and the driving member 23 having the handwheel 8 can be used.
Of the bearing 18 in the retreating direction can be received and regulated by the wheel cover 15 via the outer ring 18a of the bearing 18,
It is possible to restrict the movement of the driving member 23 in the retreating direction of the driving member 23 with less deformation of the wheel cover 15, that is, to restrict the movement of the shaft when the overwinding occurs.

Further, since the stopper 43 is provided, the wheel stopper 40 is held on the drive shaft 7 even when the wheel cover 15 is removed to disassemble the drive shaft 7 from the bearing 18. Therefore, when the foil stopper 40 is detached during disassembly, there is no risk that the foil stopper 15 will be forgotten to be assembled when the foil cover 15 is reassembled. When the shaft movement is restricted via the outer ring 18a of
Even if the load acting on the wheel stopper body 40 becomes excessively large, such as during overwinding, the foil cover 15 may be deformed, whereby the shaft movement can be secondarily restricted by the stopper member 43. Thus, the deformation of the wheel cover 15 can be suppressed, and the axial movement can be effectively controlled in cooperation with the wheel cover 15.

In the embodiment shown in FIGS. 1 and 6, since the wheel stopper 40 is formed of a cylindrical member having a predetermined length, the overload prevention is performed as in the embodiment shown in FIG. Even when the mechanism 21 is configured, it can be shared even when the boss portion of the handwheel 8 is screwed to the screw shaft portion 71 without configuring the overload prevention mechanism, and the components can be shared. And the handwheel 8
When the boss portion is screwed to the screw shaft portion 71, the use of the wheel stopper body 40 makes it possible to restrict the axial movement of the wheel stopper member 40 without increasing the axial length of the boss portion. Processing can be simplified. Also,
Although a snap ring was used as the retaining member 43, a through pin may be used instead of the snap ring,
As shown in FIG. 12, instead of the wheel stopper 40, a spacer 81 and a castle nut 82 are used to screw the nut 82 to the support shaft 72, and the nut 82 is connected to the support shaft 72 by a through pin 83. Alternatively, the wheel stopper body 40 may be omitted, and the boss portion of the driving member 23 or the hand wheel 8 may directly contact the bearing 18 or the wheel cover 15.

Next, as described above, the radial bearings 18, 19
The wheel cover 15 and the gear cover 16 that hold the gears will be described. As shown in FIG. 8, the wheel cover 15 has conduction openings 15a and 15b for conducting the hand chain on the left and right sides as viewed from the front, and between the conduction openings 15a and 15b, these conduction openings are provided. 15a, 15
The cover side wall 15c having a short length provided between the first side plate 1 and the short side cover 15c is engaged with the cover cover 47 for fixing the cover side wall 15c to the first side plate 1.
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 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, said foil cover-1
And a cover receiving portion 47c for receiving the cover 5.
The outer surface of the receiving portion 47c is formed in a round shape so that the cover side wall 15c holds the receiving portion 47c.
Further, a pair of rectangular projections 47d, which can be positioned by being fitted into a pair of rectangular fitting holes 49 formed in the side plate 1, are provided on the end surface on the first side plate 1 side. The seating surface 47e on which the inner surface of the −15 seats is provided with an insertion hole 47f through which the stay bolt 12 penetrates through the inside of the side surfaces 47a and 47b.

As shown in FIGS. 9 and 11, the hand chain guide 48 has a fastening portion 15d of the stay bolt 12 of the wheel cover 15 and the stay bolt 1.
2, a mounting portion 51 having an outer surface corresponding to the inner surface of the cover side wall 15e of the tightening portion 15d and having a bolt insertion hole 51a in a plane, and a rectangular shape provided in the first side plate 1. A holding portion 53 held by the side plate 1 and having a rectangular projection 53a that can be positioned by being fitted into the fitting hole 52;
And a guide portion 54 for guiding the hand chain, facing the hand wheel 8 and located between the two.

The cover holder 47 and the pair of hand chain guides 48, 48 are moved between the first side plate 1 and the wheel cover 15 by tightening the nut 17 to the stay bolt 12. The cover holder 47 and the hand chain guide 4
8 and 48, the rectangular projections 47d and 53a are fitted into the square fitting holes 49 and 52, so that the foil cover 15 is formed.
Of the first side plate 1 is set.

That is, the receiving portion 47 of the cover holder 47
c to receive the cover side wall 15c, the position of the cover holding member 47 with respect to the wheel cover 15 is determined, and the mounting portions 51 of the hand chain guides 48, 48 project from the inner surface of the cover side wall 15e. By hitting
Further, the position of the hand chain guides 48, 48 with respect to the wheel cover 15 is determined by being fixed by spot welding or the like in the abutted state, and therefore, the cover holder 47 and the hand chain guides 48, 48 are determined. The square projections 47d and 53a serve as positioning members, the square fitting holes 49 and 52 provided in the first side plate 1 serve as positioning recesses into which the square projections 47d and 53a are fitted and positioned, and the wheel cover 15 serves as a positioning recess. It is positioned with respect to the first side plate 15 and can be fixed at a predetermined position by tightening the nut 17 to the stay bolt 12.

On the other hand, between the gear cover 16 and the second side plate 2 on which the gear cover 16 is mounted, a positioning body mainly composed of a knock pin 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 provided mainly on the side of the gear cover 16 and may be constituted by using a knock pin which is a separate member from the gear cover 16, but as shown in FIGS. 1 and 5, the gear cover 16 is formed by burring. It is preferable to form by bulging 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 based on 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 matched with high accuracy.

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

That is, the holding portion for holding the bearing 18 is
The recess 58, the annular rib 59, and the reinforcing rib 60 connected to the annular rib 59 are reinforced and connected to the stay bolt 12 via the reinforcing rib 60 in a continuous manner. Since the reinforcing ribs 85 are provided between the tightening portions 15d to be tightened, even if a part is deformed due to an external force, the displacement of the holding portion can be prevented or minimized, and the driving shaft 7 can be prevented. Can be maintained.

Further, as shown in FIG. 4, the gear cover 16 has a central portion bulging, and the bearing 19 and the bearings 61 and 62 of the intermediate shaft 36 are provided in a bulging portion 16a having increased strength. With this configuration, it is possible to prevent the bearing 19 from being displaced by the positioning body 56 and the positioning recess 57 even when an external force is applied. Therefore, the drive shaft 7 supported by the wheel cover 15 and the gear cover 16 via the bearings 18 and 19 is connected to the wheel cover-1.
5 and the gear cover 16 can be held at a predetermined axial position even when an external impact is applied, so that interference with the load sheave 3 due to axial deviation can be avoided, and a highly durable chain block. 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 disposed immediately below the load sheave 3. The load chain guide 63, 64 and the chain bar 65 are provided to restrict the inclination of the load chain 4 entering the space between the side plates 1 and 2 and meshing with the load sheave 3 in the advancing direction. The no-load chain guide 63 of the load chain guides 63, 64 is provided with a locking portion 66 for locking the end of the load chain 4 on the no-load side. I have.

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

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

Further, since the radial bearing 18 is held in the recess 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, -It may be held through the wall.

[0057]

According to the first aspect of the present 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 supporting 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.
Is driven by a hand chain, the drive shaft 7
The shaft deflection can be reduced even if a large operation load acts on the shaft, and the 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 the operability can be improved. In addition, the problem caused by the contact of the hand wheel 8 with the chain guide or the wheel cover can be solved.

According to the second aspect of the present invention, the radial bearings 18, 15 are provided on the wheel cover 15 and the gear cover 16.
19, the two ends of the drive shaft 7 in the axial direction are connected to the wheel cover 15 and the gear cover via the bearings 18 and 19, respectively.
16 and a support system different from the support system of the load sheave 3, so that each of the bearings 18 and 19 is in the form of a ball bearing or the like having good bearing efficiency, and has an arbitrary size. And the transmission efficiency can be further improved by improving the bearing efficiency. In addition, since the drive shaft 7 supports both ends in the axial direction in a double-supported manner, the load of the driving operation of the handwheel 8 can be increased. Thus, even if a large load acts on the drive shaft 7, the shaft deflection can be reduced and the shaft deformation can be prevented, and the transmission efficiency can be further improved in conjunction with the improvement of the bearing efficiency. The operability can be improved.

According to the third aspect of the present 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. The wheel cover 15 is received by the wheel cover 15 through the outer ring 18a of the wheel 18 and therefore the wheel cover 15
The deformation of the handwheel 8 in the direction of screw retreat is small, that is, the shaft movement can be restricted in the overwinding state. The drive shaft 7
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 regulating portion 41 and the receiving portion 42. As described above, the workability can be improved and the cost can be reduced because it can be formed by the flanged tubular member.

According to the fourth aspect of the present invention, since the retaining member 43 is provided on the drive shaft 7 outside the holding portion of the wheel stopper 40, the wheel cover 8 is removed and the drive shaft 7 is mounted on the bearing 18. The wheel stopper 40 can be held on the drive shaft 7 even when disassembling the wheel cover 15, and therefore, when the wheel stopper 15 is detached during disassembly, the wheel cover 15 is reassembled when the wheel cover 15 is reassembled. It is possible to eliminate the risk of forgetting to assemble the wheel stoppers 40, and to control the axial movement via the outer ring 18a of the bearing 18, particularly when the wheel stoppers 40 are overwound.
Even when the load acting on the wheel cover 15 is excessively deformed and the wheel cover 15 is deformed, the axial movement of the hand wheel 8 can be restricted by the retaining member 43, so that the deformation of the wheel cover 15 can be suppressed. The shaft movement restriction can be effectively performed in cooperation with the wheel cover 15.

According to the fifth aspect of the present invention, 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 provided. 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 axis of the drive shaft 7 can be accurately matched with the axis of the sheave 3.

Further, in the invention according to claim 6, the annular cover 59 is provided on the wheel cover 15 and a plurality of reinforcing ribs 60 extending in the radial direction.
Stiffness without increasing the weight of the
Even if an external impact is applied, the position of the bearing 18 provided on the wheel cover 15 can be ensured, so that the rotation of the drive shaft 7 due to the displacement of the bearing 18 can be prevented from being hindered.

According to the seventh aspect of the present invention, since the reinforcing ribs 60 are provided so as to extend to a portion fixed by the stay bolt 12 for fixing the wheel cover 15 to the first side plate 1, an external impact load is provided. Is foil cover-1
5 and the bearing 1 by the stay bolt 12.
8 can be secured, and the displacement of the bearing 18 can be prevented more favorably.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view in which a center between side plates is longitudinally 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 cross-sectional view showing only a gear reduction mechanism in a lateral direction.

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

FIG. 6 is an enlarged sectional view of only the foil stopper.

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

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

FIG. 9 is a sectional view taken along line AA of FIG. 8;

FIG. 10 is a sectional view of the foil cover taken along line BB of FIG. 8;

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

FIG. 12 is a partial cross-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]

DESCRIPTION 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 regulating part 42 receiving part 43 retaining body 56 positioning body 57 positioning concave part 58 concave part 59 annular rib 60 reinforcing rib 71 screw shaft part 72 support shaft part 74 receiving step part

Claims (7)

(57) [Claims] 1. A load having a pair of first and second side plates (1) and (2) and a shaft hole (3a) and supported rotatably between the side plates (1) and (2). A drive mechanism (2) having a sheave (3) and a hand wheel (8)
0) and an axial hole (3a) of the load sheave (3), and one end in the axial direction interlocks with the drive mechanism (20),
A drive shaft (7) driven by the drive mechanism (20)
And a gear reduction mechanism (11) disposed on the other axial side of the drive shaft (7), and a wheel cover (15) covering the drive mechanism (20) is provided on the first side plate (1). In a manual chain block in which a gear cover (16) covering the gear reduction mechanism (11) is attached to the second side plate (2), the drive is provided on the wheel cover (15) side. A radial bearing (18) for supporting one axial end of the shaft (7) is provided, and the drive shaft (7) extends a drive mechanism side shaft portion for supporting the drive mechanism (20), and extends the extension shaft. A manual chain block, the end of which is supported by said radial bearing (18). 2. A wheel cover (15) side and a gear cover.
On the (16) side, radial bearings (18) and (19) for supporting the drive shaft (7) are provided, and both ends of the drive shaft (7) in the axial direction are the bearings (18).
(19) The wheel sheave (15) and the gear cover (16) are rotatably supported by the wheel cover (15) and the gear cover (16) independently of the load sheave (3), and the load sheave (3) is an inner periphery of the shaft hole (3a). 2. The manual type according to claim 1, wherein the first and second side frames are rotatably supported by a first frame and a second side frame while maintaining a predetermined interval between the first frame and the outer peripheral surface of the drive shaft. Chain block. The drive mechanism (20) includes a mechanical brake (9), and the drive shaft (7) is a screw shaft (71) for screwing a drive unit that rotates in conjunction with the handwheel (8). When,
A support shaft (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 (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). 3. The manual chain block according to claim 1, further comprising a wheel stopper (40) having a hook. 4. The support shaft (72) is smaller in diameter than the screw shaft (71), and the screw shaft (71) and the support shaft (7) are made smaller.
2), a receiving step (74) is provided, and the retaining body (43) of the foil stopper (40) is provided outside the holding part of the foil stopper (40) in the support shaft (72). The manual chain block according to claim 3, wherein the chain block is provided. 5. A wheel cover (15) and a gear cover.
Between the cover (15) and the first and second side plates (1) and (2) for mounting the covers (15) and (16), the side plates (1) of the covers (15) and (16) are provided.
3. The manual chain block according to claim 2, further comprising a positioning body for setting a position with respect to (2), and a positioning recess for fitting and positioning the positioning body. 6. The wheel cover (15) has a recess (58) for holding the bearing (18), an annular rib (59) surrounding the recess (58), and a plurality of radially extending from the annular rib (59). And a reinforcing rib (60).
Manual chain block of及beauty 2 described. 7. A reinforcing rib (60) extending radially from the annular rib (59) extends to a stay bolted portion (15d) for fixing the wheel cover (15) to the first side plate (1), 7. A manual chain block according to claim 6, which ends in said fastening part (15d).