Tool having a swing head rotatable within a small space

Details Tool having a swing head rotatable within a small space Tool having a swing head rotatable within a small space

1999-12-29

2001-05-22

Smith, James G. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Machine

C081S177700

Reexamination Certificate

active

06234049

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a ratchet tool, and more particularly, to an improved ratchet tool that has a swing head which is rotated within a small angle by an eccentric member connected to a rod in the shank.
BACKGROUND OF THE INVENTION
A conventional ratchet tool generally includes a head within which a ratchet mechanism is received, a shank extending from the head. The head has an output shaft to be engaged with a socket and when rotating the shark, the socket can be reciprocatingly rotated without removing the socket from the object. The ratchet mechanism generally includes a toothed member and a pawl member which is engaged with the toothed member to decide the effective direction of the toothed member to which the Output shaft is connected. In the effective direction, the toothed member and the output shaft both are rotated so as to tighten or loosen an object. In the opposite direction, only the toothed member is rotated while the output shaft remained still. When the toothed member is rotated with the output shaft, the pawl member is firmly engaged with the toothed member. in other words, the pawl member will not engaged with the toothed member when the gap between two adjacent teeth of the toothed member is large. The head of the ratchet tool is rotated while the output shaft is not rotated when the pawl member is located in the gap and does not firmly engaged with any tooth of the toothed member. Obviously, the conventional ratchet tool cannot be used in a small space because the small space allows the head to be rotated only a small angle.
The present invention intends to provide a tool having a head which is actuated to rotate about the output shaft by an eccentric rod connected to a rotatable shank of the tool so that when rotating the shank, the head is rotated a small angle so that the tool is especially suitable to be used in a small space.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a tool having a head with an output shaft extending therefrom and a recess is defined in an end of the head. The head is pivotally received in a slot of a base and a tube extends from the base. A shank has an eccentric rod extending longitudinally from a first end thereof and the shank
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extends through the tube so that the eccentric rod is located in the slot and retained in the recess of the head.
The object of the present invention is to provide a tool that has a rotatable shank and a head which is rotated a small angle when rotating the shank.
These and further objects, features and advantages of the present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, several embodiments in accordance with the present invention.


REFERENCES:
patent: 4334445 (1982-06-01), Timewell
patent: 4991470 (1991-02-01), Singleton
patent: 5517844 (1996-05-01), Sanders
patent: 5584220 (1996-12-01), Darrah et al.
patent: 5896789 (1999-04-01), Giardino

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