Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Reexamination Certificate
2000-03-17
2001-09-11
Meislin, D. S. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
C081S124700, C081S177200
Reexamination Certificate
active
06286395
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention concerns hand tools generally, and specifically hand held tools for turning and driving bolts, screws and the like. More specifically, this invention relates to a spherical ratchet handle for driving socket wrenches.
2. Description of Related Art
Because they are very useful, ratcheted, hand-held wrenches are ubiquitous. A ratchet wrench tool comprises an elongated handle adapted to rotate about the axis of a male drive post that couples to a cylindrical socket used to drive a threaded fastener, such as a bolt or screw. The ratchet drives the fastener by repeated turns of the wrench handle through an arc comprising a portion of a 360° sweep around the fastener axis. The ratchet mechanism embedded in the end of the handle above the post prevents unintentional reversing of fastener tightening when the handle is moved backwards. Rotation of the elongated handle through the full 360° of a single turn, however, may be hampered by nearby objects. Need commonly exists to overcome the drawbacks inherent in using such wrenches in tight quarters.
The typical solution is to provide an extension rod to offset the drive post vertically from the fastener so the handle can be rotated in more open space. Some confined situations, however, limit even this usage. A narrow or crooked access space can prevent a user from aligning an extension rod with the fastener axis, and extension rods may not be available or may be of inadequate length. In some applications, a user may be able to reach a fastener with his hand to turn it, even though he could not see it much less turn it with a conventional ratchet. A need exists for a tool useful in such situations.
For certain rotational motions, mis-alignment of the drive post and fastener axes can be problematic, especially for repetitive motions. Where a fastener must be kept precisely aligned (e.g. when first being started), a conventional, side-handle ratchet is awkward to use. Favoring accuracy over force, the user instead will grip the head of the ratchet and twist it without much help from elongated handle. A spherical ratchet handle would provide better leverage in such applications with the same desired control.
SUMMARY OF THE INVENTION
Accordingly, it is an object of this invention to provide a ratchet handle which nests comfortably and conveniently in the user's hand.
It is another object of this invention to provide a ratchet handle which, while aligned with a fastener, provides optimum leverage for driving the fastener.
It is another object of this invention to provide a spherical ratchet handle which doubles as a multiple tool device.
The foregoing and other objects of this invention are achieved by providing a ratchet handle of generally spherical shape, the handle having an embedded ratchet mechanism near one surface, the drive post of which is accessible through a diametrical channel extending from the opposite side of the sphere. An extension rod inserted into the channel mates with the drive post and extends beyond the opposite surface of the handle a selected distance to a socket wrench which may be used to drive a fastener of corresponding size. Supplemental male and female recesses accept additional extension rods that serve as lever handles and fixed, non-ratcheted drives.
REFERENCES:
patent: 226582 (1880-04-01), Miller
patent: 244309 (1881-07-01), Rhodes
patent: 1578065 (1926-03-01), Bemus et al.
patent: 2410971 (1946-11-01), Hartley
patent: 2564356 (1951-08-01), Dianda
patent: 3330316 (1967-07-01), MacNeill
patent: 3342229 (1967-09-01), Janes
patent: 3742787 (1973-07-01), Whiteford
patent: 3855882 (1974-12-01), Wittmann
patent: 4086831 (1978-05-01), Smith
patent: 4235269 (1980-11-01), Kraus
patent: 4273173 (1981-06-01), Smith et al.
patent: 4448097 (1984-05-01), Rocca
patent: 4466523 (1984-08-01), De Carolis et al.
patent: 4542667 (1985-09-01), Jang
patent: 4546677 (1985-10-01), Berkich
patent: 4748874 (1988-06-01), Sharp et al.
patent: 5461950 (1995-10-01), Iwinski
patent: 5528963 (1996-06-01), Wei
patent: 5749271 (1998-05-01), Liu
patent: 5832791 (1998-11-01), Lin
patent: 5848680 (1998-12-01), Rinner
patent: 5967003 (1999-10-01), Lin
Manning Guy V.
Meislin D. S.
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