Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Reexamination Certificate
2003-01-27
2003-11-18
Hail, III, Joseph J. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
C081S060000, C081S063000
Reexamination Certificate
active
06647833
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a hand tool, and more particularly to a ratchet wrench, which can provide larger power and can drive a pawl moving stably.
2. Description of the Related Art
FIG. 9
shows a conventional ratchet wrench
8
, which comprises a handle
80
having a head portion
81
at an end thereof. The head portion
81
is provided with a through
811
, a first chamber
812
and a second chamber
813
. A driving device
82
having teeth
821
at a annular outer surface thereof is installed in the through hole
811
via a C-ring
88
such that the driving device is rotatable. A pawl
83
is received in the first chamber
812
meshed with the teeth
821
of the driving device
82
. A switching device
84
is received in the second chamber
813
, which has a recess
841
along a diameter orientation thereof in which installs a spring
85
and a bullet
86
. The bullet
86
elastically pushes the pawl
83
. A positioning member
87
is installed in a recess
814
on a sidewall of the second chamber
813
against the switching device
84
.
The combination of the spring
85
and the bullet
86
generally has two functions, one of which is elastically pushing the pawl
83
to make it meshed with the teeth
821
of the driving device
82
, the other one of which is moving the pawl
82
to right side or left side of the first chamber
812
. The driving device
82
is turned with the handle
80
when the handle
80
is turned forwards, so that the driving device
82
can turn a nut or a bolt. But, when the handle
80
is turned reversibly, the driving device
82
will keep still.
FIG. 10
shows another conventional ratchet wrench
9
, which is similar to aforesaid conventional ratchet wrench
8
, except that an elongated piece element
96
is replaced with the bullet
86
of the ratchet wrench
8
. The elongated piece element
96
works for same functions.
In practice, the driving device
82
will be driving to turn more or less when the handle
80
is turned reversibly. This trend of the driving device is requested to be less, otherwise, the wrench will unable to turn a loosed nut or bolt.
A considerable reason of aforesaid result is the strength of the spring. It is asked to as less as possible so that the bullet
86
(or the piece element
96
) will has less affect of the pawl departing from the driving device when the handle is turned reversibly. But, a spring with smaller strength might cause the pawl cannot mesh with the driving device securely when the handle is turned forwards.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a ratchet wrench, which has less capacity of driving a driving device turning when the wrench is turned reversibly.
According to the objectives of the present invention, a ratchet wrench comprises a handle having a head portion at an end thereof, a through hole, a first chamber and a second chamber at the head portion, wherein the first chamber has opposite sides thereof communicated with the through hole and the second chamber respectively. A driving device has a polygonal hole at a center thereof and teeth at an outer side thereof whereby the driving device is installed in the through hole of the handle for free rotation. A pawl has teeth at a side thereof and a driven portion at an opposite side thereof, whereby the pawl is received in the first chamber and detachably meshes the teeth thereof with the teeth of the driving device. A switching device has an axle member and a turning member at an end of the axle member, wherein the axle member is received in the second chamber of the handle for free rotation and the turning member is left out of the handle. A supporting device, which is substantially a strip element, has two substantially parallel extending segments and a contacting segment with opposite ends thereof connected with distal ends of the extending segments, wherein proximal ends of the extending segments are movably connected with the axle member of the switching device and the contacting segment is received in the first chamber of the handle, and means for driving the contacting segment having at least a part thereof elastically against the pawl at the driven portion.
REFERENCES:
patent: 3269496 (1966-08-01), Kilness
patent: 5533427 (1996-07-01), Chow
patent: 6065374 (2000-05-01), Taggart
patent: 6435062 (2002-08-01), McCann
patent: 6516692 (2003-02-01), Hsien
patent: 6543316 (2003-04-01), Daigle et al.
Bacon & Thomas PLLC
Hail III Joseph J.
Shakeri Hadi
LandOfFree
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