Hoisting and towing device

Details Hoisting and towing device Hoisting and towing device

2002-02-20

2003-07-08

Matecki, Kathy (Department: 3654)

Implements or apparatus for applying pushing or pulling force

Apparatus for hauling or hoisting load, including driven...

Device includes rotatably driven, cable contacting drum

C254S342000, C254S344000

Reexamination Certificate

active

06588731

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a hoisting/pulling device, and more particularly to a hoisting/pulling device which can make the whole device compact and lightweight and can reduce the number of parts and the man-hours for machining and assembling the device.
BACKGROUND ART
The support structure of reduction gears and the structure of a load gear in a conventional hoisting/pulling device are explained in conjunction with FIG.
5
and FIG.
6
.
In these drawings, numeral
21
indicates a frame for a load sheave bearing and reduction gear bearings, numeral
22
indicates a load sheave, numeral
23
indicates a load gear, numeral
24
indicates a pinion gear, numeral
25
indicates reduction gears which are meshed with the pinion gear
24
, numeral
26
indicates reduction gears which are mounted coaxially with the reduction gears
25
, numeral
27
indicates the load sheave bearing which is formed in the center of the frame
21
, numeral
28
indicates bearings for reduction gear shafts which are disposed at positions outside the load sheave bearing
27
and at a given distance away from the load sheave bearing
27
, numeral
29
indicates an upper hook mounting hole, numeral
30
indicates holes for mounting stud bolts, numeral
31
indicates stud bolts, numeral
32
indicates an upper hook, numeral
34
indicates a mechanical brake which is comprised of brake plates, a brake support, a ratchet wheel and a pawl, numeral
35
indicates a pinion shaft, numeral
36
indicates a manipulation lever, and numeral
37
indicates a casing.
In the above-mentioned conventional device, as shown in
FIG. 6
, the bearings
28
for the reduction gear which are formed in the frame
21
are, to ensure the support strength of the frame, disposed at a position of a given distance A away from the load sheave bearing
27
. Accordingly, the distance between the axes of the pinion gear and each reduction gear and the distance between the axes of each reduction gear and the load gear respectively become large and the diameters of the respective gears become large. Eventually, the casing which covers these gears becomes large. Further, since the distance between the axes of the reduction gears
25
and
26
is large, it is necessary to insert the load gear
23
between the reduction gear
26
and the load sheave
22
to transmit the rotation of the reduction gear
26
to the load sheave. Further, since the load gear has a diameter which is larger than that of a bearing portion of the load sheave, it is necessary to assemble the pinion shaft having the load gear and the pinion gear after assembling the load sheave into the bearing portion of the frame.
DISCLOSURE OF THE INVENTION
As described above, in the conventional hoisting/pulling device, the distance between the axes of the reduction gear and the pinion gear and the distance between the axes of the reduction gear and the load gear are large and the respective gears are large in size. This prevents the hoisting/pulling device from being miniaturized. Further, it is necessary to assemble the pinion shaft having the load gear and the pinion gear after assembling the load sheave into the bearing of the frame, and hence, it is difficult to integrally form the load gear and the load sheave preliminarily. The present invention has been made to solve these drawbacks of the conventional device and provides a hoisting/pulling device which can make the whole device compact and lightweight and can reduce the number of parts and the man-hours for machining and assembling the device by making the distance between the axes of the reduction gears small and by making the outer diameter of the load gear equal to or smaller than the diameter of the bearing portion of the load sheave, and by integrally forming the load gear on the load sheave preliminarily.


REFERENCES:
patent: 5238226 (1993-08-01), Nishimura
patent: 6059267 (2000-05-01), Nishimura
patent: 6406001 (2002-06-01), Wada

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