Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Reexamination Certificate
2000-06-19
2001-09-04
Banks, Derris H. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
C081S063000
Reexamination Certificate
active
06282993
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a ratchet mechanism of a ratchet tool and the head of the ratchet tool has a simple structure so that the ratchet mechanism is easily assembled and installed in the head of the ratchet tool.
BACKGROUND OF THE INVENTION
A conventional ratchet tool generally includes a shank and a head that is connected to an end of the shank. A ratchet mechanism is received in the head so as to perform the desired function. The head has many stepped shoulder portions to let the parts of the ratchet mechanism be engaged with the stepped shoulder portions. In order to manufacture the stepped shoulder portions, at least three different machines or manufacturing processes are needed to finish it. The first one is to manufacture the body of the head by way of forging or the like, the second one is to define different stepped shoulder portions by lathe, and the third one is to drill holes in the head by a drilling machine. The manufacturing processes obviously builds a high manufacturing cost. Besides, a lot of parts are needed to be assembled to be the ratchet mechanism and the more number of the parts is needed, the higher possibilities that the parts could be lost during assembling the tool.
The present invention intends to provide a ratchet tool that has a head with a simple structure so that the manufacturing cost is reduced and the number of parts that compose the ratchet mechanism is few.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a ratchet tool and comprising a shank and a head which has a hole and a recess is defined in an inside of the hole. Two identical plates are respectively connected to two sides of the head and each plate has a ring portion engaged with the hole. A tongue portion extends from each the ring portion and is engaged with the recess. A slot and an aperture are respectively defined through the tongue portion. A ring member is rotatably received in the hole in the head and the ring member has a toothed outer periphery. The ring member has a polygonal inside. A pawl member is received in the recess and has a curved toothed surface defined in a first end of the pawl member. A protrusion extends from a top of the pawl member and the protrusion is movably received in the slot. A pushing member is movably engaged with a second end of the pawl member and an elongated hole is defined in the pushing member. A pin extends through the two apertures in the two plates and the elongated hole.
The object of the present invention is to provide a ratchet tool that has a head with simple structure which is easily to be manufactured.
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: 1078059 (1913-11-01), Mossberg
patent: 1635102 (1927-07-01), Watson
patent: 2185002 (1939-12-01), Pack
patent: 2735324 (1956-02-01), Goldwater et al.
patent: 3019682 (1962-02-01), Hare
patent: 4703676 (1987-11-01), Mayer
patent: 4986147 (1991-01-01), Cooper
patent: 5794496 (1998-08-01), Arnold
Forman Msrk A.
See-Bang Learng
Banks Derris H.
Baxley, Es Charles E.
Shu-Ying Tseng
Thomas David B.
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