Motor-operated cylinder

Details Motor-operated cylinder Motor-operated cylinder

1997-03-19

2001-08-21

Fenstermacher, David (Department: 3682)

Machine element or mechanism

Mechanical movements

Reciprocating or oscillating to or from alternating rotary

C074S424830, C074S3880PS

Reexamination Certificate

active

06276223

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to improvements of a motor-operated cylinder wherein the rotational movement of the output shaft of a motor is converted into a linear movement by a thread mechanism.
BACKGROUND OF THE INVENTION
In a case where, for example, an object on a roller conveyor is moved by being pushed with the conventional so-called motor-operated cylinder, the weight of the object, the resistance caused by the static friction of ball bearings acting on the rollers, and a load (reaction) to accelerate the object to a given speed, are applied simultaneously to the front end of the retractable rod of the cylinder when the object starts to be moved. Since the resistance caused by the static friction of the ball bearings acting on the rollers when the movement of the object starts is far greater than that caused by the dynamic friction of the ball bearings acting on the rollers during the movement of the object, a significant load is applied to the retractable rod of the motor-operated cylinder when the object starts moving. As a result, there is a problem in that the threaded part of the thread mechanism quickly wears away, so that in general the life of the motor-operated cylinder shortens.
This invention was made considering the above circumstances. Its purpose is to provide an improved motor-operated cylinder, wherein only the least possible load is applied to the thread mechanism thereof when an object to be moved starts moving.
SUMMARY OF THE INVENTION
To achieve the above object the motor-operated cylinder of this invention is constituted such that a booster is added to a retractable rod so as to have propelling forces exerted by both the thread mechanism and the booster act simultaneously on the retractable rod.


REFERENCES:
patent: 3824905 (1974-07-01), Jablonsky
patent: 4498350 (1985-02-01), Ross
patent: 4876906 (1989-10-01), Jones
patent: 5381702 (1995-01-01), Ohno

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