Cutlery – Sheathed – Sliding blade
Reexamination Certificate
2001-08-06
2004-12-14
Shoap, Allan N. (Department: 3724)
Cutlery
Sheathed
Sliding blade
C030S124000, C030S125000, C030S335000, C030S336000
Reexamination Certificate
active
06829827
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is related to an improved artistic knife with spare blades. The main body of the artistic knife has a guide rail serving to guide and restrict an engaging block to truly engage with and drive the blade.
FIGS. 11 and 12
show a conventional artistic knife with spare blades. The artistic knife has a handle
8
one side of which is formed with a receptacle
81
for receiving blades
82
therein. Each blade
82
is formed with two notches
821
and two locating sections
811
are disposed in the receptacle
81
to restrict the blades
82
. A blade seat
7
is disposed in the handle
8
corresponding to the receptacle
81
. The upper edge of the blade seat
7
is punched with a resilient engaging plate
71
. The engaging plate
71
slightly protrudes from the blade seat
7
and is engaged in the notches
821
of the blade
82
for fixing the innermost blade
82
in the receptacle
81
. A push button
72
of the blade seat
7
serves to forward move the blade
82
to front end of the handle
8
. In order to detach the blade
82
, the handle
8
is provided with a press button
83
for pushing the resilient engaging plate
71
to disengage from the notches
821
of the blade. Under such circumstance, the blade
82
can be drawn out and replaced by a new one. A stop board
84
and a spring push section
83
are disposed at the receptacle
81
for pushing the blade
82
toward the blade seat
7
.
Referring to
FIG. 13
, the resilient engaging plate
71
of the blade seat
7
slightly protrudes from inner edge of the blade seat
7
. In order to effectively engage the engaging plate
71
into the notches
821
of the blade
82
, the protrusion length T needs to be approximately equal to the thickness of the blade
82
. However, the blade
82
has a quite thin thickness in which an error inevitably exists when manufactured. Therefore, the protrusion length T may be too small for the engaging plate
71
to effectively engage in the notches
821
of the blade
82
. Accordingly, it is hard for the engaging plate
71
to drive the blade to extend out from the handle
8
. On the other hand, the protrusion length T may be too long so that the engaging plate
71
may engage with two blades at the same time. Under such circumstance, the blades will block the front end of the handle
8
and cannot extend out.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide an improved artistic knife with spare blades in which a blade seat is back and forth slidably disposed in the main body of the knife. The main body is formed with a receptacle corresponding to the blade seat for receiving multiple spare blades. Each blade has more than one engaging notch. The blade seat is provided with a transversely movable engaging block corresponding to the engaging notch of the blade for inserting therein. The main body has a guide rail corresponding to the engaging block. By means of the guiding and restriction of the guide rail, in the travel of the blade pushed out by the blade seat, the engaging block is inserted into the engaging notches of the blade deeper and deeper. In returning travel, the depth by which the engaging block is inserted in the engaging notch is gradually reduced until it is slightly smaller than the thickness of the blade. Therefore, the engaging block can be truly engaged with one single blade.
It is a further object of the present invention to provide the above artistic knife in which the blade seat has a slot rearward extending from the blade cavity. In addition, the receptacle has a projecting block corresponding to the slot. The projecting block is inlaid in the slot for stopping the blade when the blade seat is moved backward. Accordingly, the blade is prevented from sliding backward along with the blade seat and getting out of the receptacle.
It is a further object of the present invention to provide the above artistic knife in which the handle is pivotally connected with rear end of the main body. The handle is formed with a chamber for receiving spare blades therein. Accordingly, the number of the spare blades is increased.
The present invention can be best understood through the following description and accompanying drawings wherein:
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Prone Jason
Shoap Allan N.
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