Cutlery – Perforating or indenting implements – Pivoted handles
Reexamination Certificate
2000-04-07
2002-06-11
Rachuba, M. (Department: 3724)
Cutlery
Perforating or indenting implements
Pivoted handles
C030S362000, C030S358000
Reexamination Certificate
active
06401345
ABSTRACT:
BACKGROUND
The present invention generally relates to a tool head for a dual punch tool such as a pneumatic punch. More particularly, the invention relates to a tool head having two different punch pins operably provided therein.
Pneumatic punches are small hand-held tools used for machining. As shown in
FIGS. 5 and 6
, a conventional pneumatic punch
50
typically has a tool head
60
provided on a movable shaft
55
, which is movable in an axial direction thereof. The tool head
60
comprises an L-shaped fixed seat
61
and an inverted L-shaped movable seat
65
mated with the fixed seat
61
. The fixed seat
61
is fixedly mounted on a main body
50
a
of the pneumatic punch
50
and defines an aperture
610
therein to permit the movable shaft
55
to extend therethrough, and further defines a receiving recess or groove
62
to receive a punch pin
63
and an elastic element
64
provided around the punch pin
63
. A side cover
70
securely mounted on a top opening
62
a
of the receiving recess
62
limits the lateral movement of the punch pin
63
and the elastic element
64
. The movable seat
65
defines a screw hole
650
corresponding to the aperture
610
of the fixed seat
61
to be fixed to a threaded end of the moving shaft
55
. The movable seat
65
also defines a discharging passage
66
corresponding to the punch pin
63
. A transverse slot groove
67
is defined in the movable seat
65
and is substantially perpendicular to the discharging passage
66
. The discharging passage
66
has two opposite openings
67
a
,
67
b
in communication with the transverse slot
67
respectively provided with a first guide cylinder
68
and a second guide cylinder
69
.
In operation, and as shown in
FIG. 6
, when a sheet plate
72
is inserted for punching into the transverse groove
67
, and between the first guide cylinder
68
and the second guide cylinder
69
, the pneumatic punch
50
is actuated to retract the moving shaft
55
. This action draws the movable seat
65
toward the fixed seat
61
. Accordingly, the punch pin
63
is inserted through the second guide cylinder
69
into the first guide cylinder
68
. A waste sheet
74
punched off the sheet plate
72
is discharged via the discharging passage
66
.
However, the conventional pneumatic punch
50
only has one punch pin
63
provided to punch only one type or size of punched hole in a sheet plate, though other conventional devices are believed to also have a flange, or the like. If a work piece needs to be punched with two different hole sizes, for example, the punch pin
63
of the conventional tool head
60
of the pneumatic punch
50
must be changed or replaced frequently, or a second pneumatic size punch
50
with a different punch pin must be available.
Accordingly, it is an objective of the present invention to provide an improved tool head of a hole punching device that can punch two different sizes or types of holes in a work piece by repositioning a single tool head.
These and other objects, advantages and novel features of the present invention are discussed or will be apparent in the detailed description of the invention.
SUMMARY OF THE INVENTION
In keeping with one aspect of the present invention, a hand-held, hole punching device has a shaft, a main body with a device for axially moving the shaft in a reciprocating motion and a tool head connected to the shaft. The tool head includes a fixed portion on the main body for slidably engaging the shaft so that the fixed portion permits the shaft to slide axially relative to the fixed portion. The tool head also has a movable portion secured to the shaft so that the movable portion moves axially with the shaft. The movable portion and the fixed portion cooperatively define at least two hole punchers. Each hole puncher has a punch pin that is different from a punch pin of any other hole puncher on the tool head.
In another aspect of the present invention, the hole punching device also includes a fixed portion that is configured with a generally upright J-shaped formation and a movable portion that is configured with a generally inverted J-shaped formation. The portions are then disposed relative to each other so that the fixed portion impedes axial motion of the movable portion.
In yet another aspect of the present invention, the hole punching device further includes a fixed portion with an axially extending guide block and a movable portion with an axially extending guide slot configured and disposed for matingly engaging the guide block. The mating of the guide block with the guide slot at least prevents lateral movement of either the fixed or the movable portion relative to the corresponding other fixed or movable portion on the tool head.
REFERENCES:
patent: 3008234 (1961-11-01), Mattera
patent: 4583438 (1986-04-01), Kane
patent: RE33798 (1992-01-01), Waltonen
patent: 5095618 (1992-03-01), Dacey, Jr.
patent: 5390575 (1995-02-01), Saito
patent: 5622076 (1997-04-01), Welty
patent: 5630277 (1997-05-01), Kimura
patent: 5974926 (1999-11-01), Kimura
Greer Burns & Crain Ltd.
K.K.U. Limited
Rachuba M.
Tran Kim Ngoc
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