Information
-
Patent Grant
-
6324762
-
Patent Number
6,324,762
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Date Filed
Thursday, February 3, 200024 years ago
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Date Issued
Tuesday, December 4, 200122 years ago
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CPC
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US Classifications
Field of Search
US
- 030 2
- 030 125
- 030 329
- 030 332
- 030 337
- 030 339
- 007 118
- 007 158
- 007 165
- 007 167
- 081 1774
- 081 490
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International Classifications
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Abstract
A combinable scriber knife includes a handle combined with a main housing and a subordinate housing. The main housing has a slotted lock at a first end engageable with a locking plate at a first end of the subordinate housing, a U-shaped hook pivoted at a second end including a locking knot on inner side engageable with a locking hole in a second end of the subordinate housing, a pair of coupling posts on an inner side engageable with a pair of coupling holes in an inner side of the subordinate housing, a plurality of chambers inside the main housing to receive a plurality of the hexagonal shanks of screwdriver which are engageable within a hexagonal central bore at the second of the main housing and a trapezoid shaped blade inserted into the slotted lock and retained by a knot inside the main housing.
Description
BACKGROUND OF THE INVENTION
The present invention relates to cutting apparatus and more particularly to a combinable scriber knife which has a housing combined without screws or rivet so as to be readily assembled or disassembled during the replacement of blade.
Conventional scriber knife includes at least two types. The first type comprises a hollow interior handle into which is a breakable blade slidably received. The blade is composed of a plurality of breakable portions. When the edge of the distal portion becomes blunt, it can be broken off and let the sharp-pointed edge of the second portion to be available. This type of scriber knife is convenient in use. However, if wastes of material. Besides, when all portions of the blade is broken off, it becomes useless. The second type of the scriber knife comprises a combined handle which is fastened by screws or rivet and a stronger single blade fixed into the handle. This blade can cut rigid materials. However, it is difficult to change the blade when it becomes blunt.
SUMMARY OF THE PRESENT INVENTION
The present invention has a main object to provide a combinable scriber knife which has a handle releasibly combined with a main housing and a subordinate housing without using screw or rivet.
Another object of the present invention is to provide a combinable scriber knife which has a retaining slot at a first end of the main housing for securing a retaining plate at a first end of the subordinate housing.
Still another object of the present invention is to provide a combinable scriber knife which has a retaining knot in the first end for retaining a blade.
Further object of the present invention is to provide a combinable scriber knife which has a U-shaped hook pivoted at a second end of the subordinate housing for coupling the subordinate housing to an end of the main housing.
Further object of the present invention is to provide a hexagon cavity at the second end of the main housing enabling the knife to engage with a shank of screwdriver.
Further object of the present invention is to provide a combinable scriber knife which includes a plurality of chambers inside the handle for receiving the shanks of screwdriver with different heads.
The present invention will become more fully understood be reference to the following detailed description thereof when read in conjunction with the attached drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is an exploded perspective view to show a combinable scriber knife of the preferred embodiment according to the present invention.
FIG. 2
is a perspective view to show an outlook of an assemblage of
FIG. 1
,
FIG. 3
is a perspective view to show an inner structure of the present invention,
FIG. 4
is a sectional view to show the structure at the second end of the present invention,
FIG. 5
is a sectional view indicating that the U-shaped hook is at an opening position,
FIG. 6
is a sectional view taken along Line
4
—
4
of
FIG. 4
, and
FIG. 7
is a sectional view indicating that a shank of screwdriver engages into the hexagon cavity at the second end of the knife.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
With reference to
FIGS. 1
,
2
and
3
of the drawings, the combinable scriber knife of the present invention comprises generally a handle releasibly combined with a main housing
10
and a subordinate housing
20
of roughly V-shaped section.
The main housing
10
has a lock
11
at a first end including a retaining slot
111
, a knot
12
inside the housing
10
adjacent the lock
11
, a guide plate
13
abutting the knot
12
, a plurality of longitudinal partitions
14
and
15
respectively connected with a plurality of transverse partitions
16
so as to define a plurality of chambers
141
,
151
and
161
therebetween, a cylinder
17
centrally formed at a second end including a hexagonal central bore
171
toward outside of the housing
10
(as shown in FIG.
4
), a pair coupling posts
18
spacedly formed in the second end aside the cylinder
17
, a notch
19
formed in the outer surface of the second end and a pair of pivot holes
191
spacedly formed in the notch
19
adjacent the coupling posts
18
. A U-shaped hook
24
has a pair of retaining ends
241
including a pair of elastic extensions
242
at their outer ends pivotally engaged into the pivot holes
191
respectively in a snap fitting, a central hole
243
in a transverse portion of the U-shaped hook
24
engageable with the hexagonal central bore
171
of the cylinder
17
, a bevel front edge
245
at a locking end
244
and a locking knot
246
centrally formed on an inner side of the locking end
244
(as shown in FIGS.
5
and
6
).
The subordinate housing
20
has a locking plate
21
projected outward form a first end engageable into the retaining slot
111
of the lock
11
, a pair of coupling holes
22
spacedly formed in an inner side adjacent a second end engageable with the coupling posts
18
, a rectangular depression
23
formed in an outer side abutting the second end and a locking holes
231
centrally formed in the depression
23
engageable with the locking knot
246
of the U-shaped hook
24
.
A trapezoid shaped blade
30
engageable into the retaining slot
111
of the main housing
10
and slidable on the guide plate
13
has a pair of retaining notches
31
spacedly formed in the back made engageable with the knot
12
.
A plurality of shanks
32
of screwdriver are received in the chambers
141
,
151
and
161
of the main housing
10
(as shown in FIG.
3
). The shanks
32
each has a hexagonal body engageable with the hexagonal central bore
171
of the cylinder
17
, a keystone tip and a phillips tip which may be different in size to fit different size of screws.
When assembling, first engage the blade
30
into the retaining slot
111
of the main housing
10
and engage one of the retaining notches
31
with the knot
12
and dispose the shanks
32
of screwdriver into the chambers
141
,
151
and
161
(as shown in FIG.
3
), then insert the locking plate
21
of the subordinate housing
20
into the retaining slot
111
from inner side thereof and then combine the main housing
10
and the subordinate housing
20
together when the pair of coupling posts
18
are automatically engaged with the coupling holes
22
, finally press the U-shaped hook
24
inward so that the locking knot
246
will be firmly locked in the locking hole
231
in a snap fitting.
FIG. 2
shows a well assembled scriber knife of the present invention which is combined without needing a screw or rivet, if inverts the above process to change the blade
30
, one can readily disassemble the scriber knife without needing a lock.
When one wants to fasten or unfasten a screw, takes one of suitable shank
32
from the chamber
141
,
151
or
161
and engages the shank
32
into the hexagonal central bore
171
(as shown in FIG.
7
), it will provide adequate torque to finish the job.
The specification relating to the above embodiment should be construed as exemplary rather as limitative of the present invention with many variations and modifications being readily attainable by a person of average skill in the art without departing from the spirit or scope thereof as defined by the appended claims and their legal equivalents.
Claims
- 1. A combinable scriber knife comprising:a handle of V-shaped section releasibly combined a main housing and a subordinate housing: said main housing having a lock including a retaining slot at a first end thereof, a knot inside the main housing adjacent the lock, a guide plate abutting the knot, a plurality of longitudinal partitions connected respectively with a plurality of transverse partitions to define a plurality of chambers inside the main housing, a cylinder including a hexagonal central bore toward outward centrally formed in a second end thereof, a pair of coupling posts spacedly formed in the second end aside the cylinder, a notch formed in an outer surface of the second end and a pair of pivot holes spacedly formed in the notch adjacent the coupling posts; a U-shaped hook having a pair of retaining ends including a pair of elastic extensions extending outward from their outer ends respectively pivoted in the pivot holes of the main housing in a snap fitting, a central hole in a transverse portion of the U-shaped hook engageable with the hexagonal central bore of the cylinder, a bevel edge at a locking end thereof and a locking knot centrally formed on an inner side of the locking end; said subordinate housing having a locking plate projected outward from a first end thereof engaged with the retaining slot at the first end of the main housing, a pair of coupling holes spacedly formed in an inner side adjacent a second end thereof respectively engaged with the coupling posts of the main housing, a rectangular depression formed in an outer surface abutting the second end of the subordinate housing and a locking hole centrally formed in the rectangular depression engaged with the locking knot of the U-shaped hook; a trapezoid shaped blade inserting into the retaining slot at the first end of the main housing and slidable on the guide plate having a pair of retaining notches spacedly formed in a back thereof and engaged with the knot of the main housing; a plurality of shanks of screwdriver disposed into the chambers of the main housing, said shanks each having a hexagonal body engageable with the hexagonal central bore of the main housing, a keystone tip at a first end and a phillips tip at a second end thereof.
- 2. The scriber knife according to claim 1 wherein said keystone tip and said phillips tip can be different in size.
US Referenced Citations (6)