Tools – Wrench – screwdriver – or driver therefor – Machine
Reexamination Certificate
2000-05-10
2001-08-14
Eley, Timothy V. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Machine
C081S063100, C081S057280, C081S057290, C007S138000
Reexamination Certificate
active
06272952
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a screwdriver and wrench combination hand tool, and more particularly to such a screwdriver and wrench combination hand tool, which comprises a double-reversible screwdriver and a wrench.
Screwdriver and wrench are commonly used hand tools. However, these two hand tools are provided for different purposes, i.e., a screwdriver, as shown in
FIG. 1
, is designed for turning screws, and a wrench, as shown in
FIG. 2
, is designed for turning bolts and nuts. The screwdriver shown in
FIG. 1
is a double-reversible screwdriver. This structure of double-reversible screwdriver, as shown in
FIGS. 1 and 3
, is generally comprised of a handle
1
, a ratchet holder
2
, a ratchet wheel
3
, two movable stop plates
401
and
402
, a plastic slide
5
, a retainer plate
6
, a metal protective sleeve
7
, and a screwdriver bit
8
. The ratchet holder
2
, the ratchet wheel
3
, the movable stop plates
401
and
402
, and the slide
5
form a double-reversible control mechanism for controlling the direction of rotation of the screwdriver bit
8
. The stop plates
401
and
402
are respectively mounted at front and rear ends in a receiving chamber
201
in the ratchet holder
2
at two opposite sides of the ratchet wheel
3
. Because the stop plates
401
and
402
are respectively mounted at the front and rear ends in the receiving chamber
201
in the ratchet holder
2
, the receiving chamber
201
has a certain length, which limits the installation of wrench means to provide an added function to the double-reversible screwdriver. Further, the plate slide
5
has positioning blocks
501
secured to a notched sliding slot
701
in the metal protective sleeve
7
. The slide
5
wears quickly with use because positioning blocks
501
are frequently rubbed against the peripheral edge of the notched sliding slot
701
. When the slide
5
begins to wear, it can no longer positively positioned in the notched sliding slot
701
.
SUMMARY OF THE INVENTION
The present invention has been accomplished under the circumstances in view. It is the main object of the present invention to provide a double-reversible screwdriver and wrench combination tool, which combines a double-reversible screwdriver and a wrench into a handy hand tool. It is another object of the present invention to provide a double-reversible screwdriver and wrench combination hand tool, which is durable and practical in use. According to one aspect of the present invention, the double-reversible screwdriver and wrench combination hand tool comprises: a handle, a main body fastened to one end of the handle, the main body comprising a rear coupling end fastened to the handle, a front end terminating in a T-tube formed of a longitudinal tube and a transverse tube, and a receiving chamber on the middle between the rear coupling end and the front end, a longitudinal spindle mounted in the longitudinal tube, the longitudinal spindle having a rear end terminating in a fixed ratchet wheel suspended inside the main body, and a front end terminating in a coupling portion and disposed outside the longitudinal tube, a coupling socket coupled to the coupling portion of the longitudinal spindle to hold a screwdriver bit, enabling the screwdriver bit to be rotated with the longitudinal spindle, a first bevel gear suspended in the receiving chamber inside the main body and rotated with the longitudinal spindle, a transverse spindle mounted in the transverse tube and rotated with the longitudinal spindle, the transverse spindle having a front coupling rod extended out of the transverse tube for holding a wrench socket for turning screw bolts and nuts, a second bevel gear fixedly provided at a rear end of the transverse spindle and meshed with the first bevel gear for synchronous rotary motion with the longitudinal spindle, and double-reversible control mechanism provided in the main body and operated to control forward/reverse rotation of the longitudinal spindle relative to the main body. According to another aspect of the present invention, the longitudinal tube and the transverse tube each have an inner thread, and two screw plugs are respectively threaded into the inner thread in the longitudinal tube and the transverse tube to hold the longitudinal spindle and the transverse spindle in place. According to still another aspect of the present invention the double-reversible control mechanism comprises a ratchet wheel fixedly mounted on the longitudinal spindle, a first stop means and a second stop means bilaterally mounted inside the receiving chamber and respectively forced into engagement with the ratchet wheel to stop the ratchet wheel from rotary motion, a holding down spring plate mounted in the main body to hold down the first stop means and the second stop means, and a rotary wheel mounted on the main body and rotated between a first position where said first stop means is released from said ratchet wheel and said second stop means is maintained engaged with said ratchet wheel for enabling said ratchet wheel to be rotated clockwise relative to said main body, a second position where the second stop means is released from the ratchet wheel and the first stop means is maintained engaged with the ratchet wheel for enabling the ratchet wheel to be rotated counter-clockwise relative to the main body, and a third position where the first stop means and the second stop means are maintained engaged with the ratchet wheel to stop the ratchet wheel from rotary motion relative to the main body, the rotary wheel having a projecting rod for moving the first stop means and the second stop means upon rotary motion of the rotary wheel on the main body. According to still another aspect of the present invention, the first bevel gear comprises a coupling hole coupled to the ratchet wheel for enabling the longitudinal spindle to be rotated with the first bevel gear. According to still another aspect of the present invention, a spring is mounted on the transverse spindle and stopped between the second bevel gear and the screw plug in the transverse tube to force the second bevel gear into engagement with the first bevel gear. According to still another aspect of the present invention, the holding down spring is fastened to an invertedly extended L-shaped holder inside the receiving chamber. According to still another aspect of the present invention, the holding down spring comprises positioning flange means secured to a broad area in the receiving chamber. According to still another aspect of the present invention, the double-reversible control mechanism further comprises three recessed locating holes equiangularly provided at the rotary wheel, a spring element mounted in a recessed hole on the main body, and a steel ball supported on the spring element and forced by the spring element into engagement with one of the recessed locating holes to hold the rotary wheel in one of the first position, second position and third position. According to still another aspect of the present invention, a first shell and a second shell are sealed together and covered on the T-tube of the main body, and a cylindrical third shell is coupled to the first shell and the second shell and rotated on the main body, the third shell having an inside projection engaged into a locating groove on the rotary wheel for enabling the rotary wheel to be rotated with the third shell. According to still another aspect of the present invention, the receiving chamber of the main body has a bottom wall sloping downwards from an outer side thereof toward the center thereof, and the first top means and the second stop means are tilted and perpendicularly forced into engagement with sloping teeth of the ratchet wheel. According to still another aspect of the present invention, the holding down spring is mounted in an outside annular groove at the periphery of the main body, having two protruding pressure strips for pressing on the first stop means and the second stop means respectively. According to still another aspect of the present inv
Hsu Chang Hsueh-O
Hsu Yu-Tu
Berry Jr. Willie
Birch & Stewart Kolasch & Birch, LLP
Eley Timothy V.
LandOfFree
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