Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Reexamination Certificate
2000-06-21
2001-05-29
Meislin, D. S. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
Reexamination Certificate
active
06237447
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a one-way driving control mechanism of a wrench, and more particularly to a one-way driving control mechanism of a wrench with an elliptical spinner element, a diameter-variable grommet and a pawl in the housing of its head. When the spinner element rotates the body of the wrench, a pawl is jammed on one side of the housing by spinner element to perform one-way driving. That is, the spinner element can rotate relatively to the wrench body to make one segment of the grommet jam against the wall of the housing to get one-way fastening. Thus the wrench body can drive the spinner element in one direction for screwing a screw nut or screw bolt. Therefore the one-way driving control mechanism of a wrench according to the invention has a simpler mechanism and greater torque.
BACKGROUND OF THE INVENTION
The well-known one-way driving control mechanism of a wrench are described as following, a called D-head ratchet wrench is disclosed in U.S. Pat. No. 5,537,899, which is characterized by an inner peripheral surface having an annual groove in its housing and a pawl with teeth in each of two ends of a driving head. The driving head establishes a one-way rotation by controlling that the pawl in one end engages with the annular groove of a body. Furthermore, a reverse rotation can be established by rotating a chucking block to make the pawl in the other end engaging with the annular groove. Thus, a one-way driving control in a reverse direction can be performed. A called calabash-form ratchet wrench, is disclosed in U.S. Pat. Nos. 5,957,009 and 5,533,427. This kind of ratchet wrench, which includes an annular groove in the inner peripheral surface of a driving head and a suitable pawl having teeth, in fundamental, is similar to that of the above-mentioned patent. Thus, the function of one-way rotation can be achieved by engaging the pawl with the annular groove in inner peripheral surface. Further, a called non-noise ratchet wrench is disclosed in U.S. Pat. Nos. 5,941,140 and 5,884,537, which is constituted with a rolling body, a spring and non-regular surface. The rolling body jams with and looses from the non-regular surface of the housing to establish the one-way driving control. Unlike former above-mentioned ratchet wrenches, the last type of ratchet wrench does not appear the phenomenon of jumping teeth, and hence has no noise. However, for the ratchet wrench having the annular groove engaged with a pawl, its disadvantages include complicated mechanism, high manufacturing cost, and causing jumping teeth noise. And the non-noise ratchet wrench has too many components, and is also with high manufacture cost as well as small torque.
SUMMARY OF THE INVENTION
The primary objective of the invention is to provide a wrench of simple mechanism, low cost, no-noise driving and big torque. According to the invention, the one-way driving control mechanism of a wrench comprises a wrench body, a spinner element, a diameter-variable grommet and a pawl. The head portion of the wrench body has a housing for placing a spinner element, a diameter-variable grommet and a pawl. The middle portion of the spinner element takes the shape of an elliptic cylinder. A diameter-variable grommet consisting of two movable separate segments is set around the circumference of the cylinder. The outside diameter of such a diameter-variable grommet is slightly smaller than the inside diameter of the housing. With twisting the wrench, the spinner element rotates relatively to the wrench body, and then the elliptic cylinder pushes the diameter-variable grommet outward, which make one segment of the grommet jam against the wall of the housing to get one-way fastening. As a result, such wrench is capable of achieving the virtues of simplifying mechanism, reducing manufacture cost, having no noise and increasing torque.
REFERENCES:
patent: 5199329 (1993-04-01), Hsu
patent: 5509332 (1996-04-01), Donaldson
patent: 5533427 (1996-07-01), Chow
patent: 5537899 (1996-07-01), Diedrich
patent: 5957009 (1999-09-01), McCann
Chen Chyn-Huei
Chen Shiou-Yih
Meislin D. S.
Rosenberg , Klein & Lee
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