Transmission shaft of a movable arm of a pipe bender

Details Transmission shaft of a movable arm of a pipe bender Transmission shaft of a movable arm of a pipe bender

1999-09-28

2001-01-09

Butler, Rodney A. (Department: 3725)

Metal deforming

By deflecting successively-presented portions of work during...

By use of work-contacting wiper and moving, work-holding form

C072S155000

Reexamination Certificate

active

06170310

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a pipe bender, which has a shaft, a movable arm and a fixed arm. The movable arm is movable with the shaft in order to bend a pipe positioned between the movable arm and the fixed arm.
Referring to
FIG. 6
, a heretofore known pipe bender comprises a covering
11
, a shaft holder
12
, a shaft
13
, a movable arm
14
, a fixed arm
15
and a transmission combination
16
.
The transmission
16
is arranged in the covering
11
, and has an oil cylinder
161
. The oil cylinder
161
has one end connected to a chain
162
, and the other end connected to a chain
163
. The chains
162
,
163
wind around a first wheel
164
and a second wheel
165
respectively, and then connect a connecting rod
166
.
Referring to
FIG. 7
, the oil cylinder
161
makes the shaft
13
turn in order to move the movable arm
14
relative to the fixed arm
15
. Thus, the movable arms
14
and the fixed arm
15
can bend a pipe located in between.
The process and fastening means for locating a pipe to the fixed arm and the movable arm are not a subject of the present invention, so they are not detailed here.
From the above description, it can be seen that the pipe is bent by means of the cylinder driving the first wheel
164
. Therefore, the wheel is made to have a circumference as big as possible in order for the pipe bender to have more power. However, the size and the cost of the pipe bender will increase when the wheel is big, i.e. the pipe bender is less cost-effective.
SUMMARY OF THE INVENTION
It is a main object of the present invention to provide a transmission shaft for a pipe bender, of which the dimensions do not have to be increased to increase the torque output.
The transmission shaft of a movable arm of a pipe bender comprises:
a main shaft having an upper end fixedly connected to the movable arm; the main shaft further has:
(i) several evenly spaced pin holes each receiving a pin therein;
(ii)openings each communicating with a corresponding one of the pin holes;
(iiii) planet gears received in the main shaft, each being pivoted on a corresponding one of the pins and communicating with outside through the openings;
a sun gear ring fixed to a connecting part of a fixed arm of the pipe bender, the sun gear ring being located around, and engaging the planet gears; and,
a central gear shaft having an upper end portion passed into the main shaft, and engaging the planet gears for passing on power to the planet gears.
Whereby, the main shaft can turn to move the movable arm when the central gear shaft is turned because the sun gear ring engaging the planet gears is fixed.


REFERENCES:
patent: 1985454 (1934-12-01), McCabe
patent: 4103565 (1978-08-01), Matikainen et al.
patent: 4843858 (1989-07-01), Grimm et al.
patent: 5462098 (1995-10-01), Murakami
patent: 5862697 (1999-01-01), Webster

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