Information
-
Patent Grant
-
6473955
-
Patent Number
6,473,955
-
Date Filed
Wednesday, October 24, 200122 years ago
-
Date Issued
Tuesday, November 5, 200221 years ago
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Inventors
-
Original Assignees
-
Examiners
Agents
-
CPC
-
US Classifications
Field of Search
US
- 029 268
- 029 267
- 029 278
- 029 280
- 029 283
- 029 2835
- 029 270
- 269 6
- 269 3
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International Classifications
-
Abstract
An improved pulling gun to provide a parallel and linear pulling force for pulling out screws of various sizes from bulged screw cartridges smoothly without reduced defects. The pulling gun includes a lever and a handle having respectively an upper section pivotally engaged with each other and a lower section bifurcated at a front and a rear position by a pivotal spring located in the handle. The lever has an upper pin mounted to the top end to pivotally engage with a guide sleeve which has two side walls formed respectively an upper flange and a lower flange bent inwards from the top and bottom ends thereof. The upper section of the handle engages with a pulling sleeve which has two side walls each having a guide slot in parallel with each other to allow the upper pin of the lever moving therein. The pulling sleeve is movable in the guide sleeve linearly and in parallel to generate a linear and parallel pulling force to remove screws without wobbling or generating defects.
Description
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.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a perspective view of a conventional pulling gun.
FIG. 2
is a side view of a conventional pulling gun in use.
FIG. 3
is a front view of a conventional pulling gun in use.
FIG. 4
is a perspective view of the invention.
FIG. 5
is an exploded view of the invention.
FIG. 6
is a side view of the invention in use.
FIG. 7
is a front view of the invention in use.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to
FIG. 4
, the invention mainly includes a lever
10
and a handle
20
which have respectively an upper section pivotally engaged with each other and a lower section bifurcated at a front and a rear position. The lever
10
has an upper pin
11
mounted to the top end to pivotally engage with a guide sleeve
30
. The guide sleeve
30
has two side walls which have respectively an upper flange
31
and a lower flange
32
bent inwards from the top and bottom ends thereof. The handle
20
has an upper section with two side walls thereof forming jutting ledges
21
to fasten with two lower plates
41
of a pulling sleeve
40
through three pins
22
,
22
′ and
22
″. The three pins include an outer pin
22
′ to pivotally engage with the lever
10
and an inner pin
22
″ to anchor a tension spring
50
which has two extended legs
51
to push the inner walls of the lower sections of the handle
20
and lever
10
apart at normal conditions. The pulling sleeve
40
is coupled with the interior of the guide sleeve
30
and has two side walls each having a guide slot
42
in parallel with each other. The upper pin
11
of the guide sleeve
30
passes through the guide slot
42
. The guide sleeve
30
and pulling sleeve
40
have respectively a front end which has a V-shaped notch
33
and
43
formed thereon. The notches
33
and
43
have a wider top end and a narrower bottom end (as shown in FIGS.
4
and
7
).
Referring to
FIG. 6
, the upper flange
31
and lower flange
32
of the guide sleeve
30
guide the pulling sleeve
40
moving in parallel in the guide sleeve
30
, and the parallel guide slots
42
on the pulling sleeve
40
allow the pulling sleeve
40
moving linearly through the upper pin
11
of the guide sleeve
30
.
Referring to
FIG. 7
, when in use, the front walls of the guide sleeve
30
and pulling sleeve
40
are contacted to each other, and the notches
33
and
43
may be wedged on the neck section of the head of a screw
62
located in a bulged screw cartridge
60
. Then grasp handle
20
and lever
10
and move them towards each other as shown by the arrow in
FIG. 6
, the upper pin
11
originally located at the rear end of the guide slot
42
will be moved forwards and drives the guide sleeve
30
forwards, and the pulling sleeve
40
will be moved rewards relative to the guide sleeve
30
as shown by the arrow in FIG.
4
. As shown in
FIG. 7
, the front wall of the guide sleeve
30
is anchored on the screw seat
61
of the bulged screw cartridge
60
, hence the pulling sleeve
40
will be moved rearwards relative to the inner pin
22
′ which serves as a fulcrum shown by broken lines in FIG.
6
. The notch
43
thus can pull the head of the screw
62
rearwards from the bulged screw cartridge
60
to a position shown by the broken line to complete screw removing operation.
Referring to
FIG. 7
, the notches
33
and
43
of the guide sleeve
30
and pulling sleeve
40
is tapered from the top end to the bottom end, thus can be used to engage and remove different sizes of the screw
62
and bulged screw cartridge
60
. The parallel and linear movement of the invention can also produce a parallel and linear pulling force during operation to prevent wobbling and reduce defected operation.
While the preferred embodiment of the invention has been set forth for the purpose of disclosure, modifications of the disclosed embodiment of the invention as well as other embodiments thereof may occur to those skilled in the art. Accordingly, the appended claims are intended to cover all embodiments which do not depart from the spirit and scope of the invention.
Claims
- 1. A pulling gun for deploying expanding anchors, comprising:a lever having an upper pin mounted to a top end thereof to pivotally engage with a guide sleeve and a first upper section and a first lower section, the guide sleeve having two side walls each having an upper flange and a lower flange bending inwards from the top end and the bottom end thereof, and a first front wall having a first notch with an opening facing upward; and a handle having a second upper section pivotally engaged with the first upper section of the lever and a second lower section which is pivotally engaged with a spring which in turn pushes the first lower section and the second lower section apart and bifurcated at a front position and a rear position, the second upper section being engaged with a pulling sleeve which is coupled with the interior of the guide sleeve, the pulling sleeve having two side walls which have respectively a slot in parallel with each other, the upper pin of the lever being movable in the slots, the pulling sleeve further having a second front wall which has a second notch formed thereon matching and contactable with the first notch; wherein the pulling sleeve is movable linearly and in parallel in the guide sleeve through bordering of the upper flange and the lower flange and channeling of the parallel slots about the upper pin anchored on the guide sleeve to generate a linear and parallel pulling force.
- 2. The pulling gun for deploying expanding anchors of claim 1, wherein the first notch and second notch are respectively formed in V-shaped tapering from the top to bottom thereof.
US Referenced Citations (4)