Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Reexamination Certificate
2001-10-24
2002-11-05
Wilson, Lee (Department: 3723)
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
C029S270000, C029S280000, C029S282000, C269S006000
Reexamination Certificate
active
06473955
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an improved pulling gun and particularly a pulling gun that provides a parallel and linear pulling force for pulling out screws of various sizes from bulged screw cartridges smoothly with reduced defects.
2. Description of the Prior Art
Conventional pulling guns such as the one shown in
FIG. 1
generally include a handle
70
and a lever
80
coupling at the upper sections and bifurcated at the lower sections in a front and a rear manner. There is a tension spring
50
pivotally engaged with a pivotal pin
73
anchored on two walls of the handle
70
with two extended legs
51
to keep the lower section of the lever
80
spaced from the lower section of the handle
70
at normal conditions. There is a cylindrical guiding sleeve
71
mounted to the upper section of the handle
70
. There is also a cylindrical pulling sleeve
81
of a smaller diameter mounted to the upper section of the lever
80
and coupled with and housed in the guiding sleeve
71
. The sleeves
71
and
81
have respectively a notch
711
and
811
formed at the front ends. The lever
80
further has two guide slots
82
formed on two walls to couple respectively with a support pin
72
.
Referring to
FIG. 2
, when not in use at the normal conditions, the lower sections of the handle
70
and lever
80
are bifurcated and spaced from each other, and the front ends of the sleeves
71
and
81
are contacted. As shown in
FIG. 3
, the notches
711
and
811
of the sleeves
71
and
81
have an upward opening which may be wedged on the neck section under the head of a screw
62
located in a bulged screw cartridge
60
with the front end of the guiding sleeve
71
depressing against the outer rim of the screw seat
61
. When the lever
80
is depressed against the handle
70
, the upper section of the lever
80
will move the pulling sleeve
81
rearwards to pull the head of the screw
62
and remove the screw
62
.
As the lever
80
is pivotally engaged with the handle
70
on a single pivotal joint, when the lever
80
is moved towards the handle
70
about the pin
73
as a fulcrum, the upper ends of the handle
70
and lever
80
will be moved away in opposite directions, and the pulling sleeve
81
of the lever
80
will pull the screw
60
rearwards. The top end of the handle
70
will be rocked along a curve (shown by broken lines in FIG.
2
). As a result, the guiding sleeve
71
will be moved in a skewed direction and biased from the accurate anchor position. The movement of pulling the screw will be skewed and becomes not effective.
Moreover, the notches
711
and
811
of the sleeves
71
and
81
usually are formed in a fixed size of a semicircular shape. Thus one set of pulling gun can fit and be used for the bulged screw cartridge
60
of one specification. Its applicability is severely limited.
SUMMARY OF THE INVENTION
In view of aforesaid disadvantages, it is a primary object of the invention to provide an improved pulling gun that provides a parallel and linear pulling movement between the guiding sleeve and pulling sleeve so that a parallel and linear pulling force will be generated to pull out the screw without wobbling to reduce defected operations.
Another object of the invention is to provide an improved pulling gun that have V-shaped notches formed on the front walls of the guiding sleeve and pulling sleeve for pulling out screws of various sizes from bulged screw cartridges effectively and conveniently.
To achieve the objects set forth above, the invention has a lever pivotally engaged with a handle at an upper section and formed bifurcated lower sections in a front and a rear manner. The lever has an upper section pivotally engaged with two side walls of a guiding sleeve through an upper pin. The two side walls of the guiding sleeve have respectively an upper flange and a lower flange bent inwards on the top and bottom edges. The handle has an upper section with two side walls thereof formed jutting ledges to fasten with a pulling sleeve through three pins. The three pins include an outer pin to pivotally engage with the lever and an inner pin to anchor a tension spring which has two extended legs to push the inner sides of the lower sections of the handle and lever to make them spaced apart at normal conditions. The pulling sleeve is coupled with the interior of the guide sleeve and has two side walls each having a guide slot in parallel with each other. The upper pin passes through the guide slot for guiding the pulling sleeve moving in parallel and linearly between the upper and lower flanges of the guide sleeve. The guide sleeve and pulling sleeve have respectively a front wall which have a notch formed thereon. Then notch has a wider top end and a narrower bottom end to engage with screw heads of various sizes in the bulged screw cartridges. The pulling gun thus made can provide a parallel and linear pulling force to remove the screws without wobbling or resulting defected operations.
The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.
REFERENCES:
patent: 2339397 (1944-01-01), Helbush
patent: 4602418 (1986-07-01), Bone et al.
patent: 4932638 (1990-06-01), Chen
patent: 6108885 (2000-08-01), Cox
Joker Industrial Co., Ltd.
Rosenberg , Klein & Lee
Wilson Lee
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