Cutlery – Cutting tools – Plural cooperating blades
Reexamination Certificate
2000-08-24
2002-01-08
Watts, Douglas D. (Department: 3724)
Cutlery
Cutting tools
Plural cooperating blades
C030S261000
Reexamination Certificate
active
06336272
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a scissors structure.
2. Description of the Related Art
A conventional scissors structure
50
in accordance with the prior art shown in
FIG. 8
comprises two pivotally connected blades
51
, two handles
54
, a locking pin
52
secured on one of the two blades
51
, a recessed locking piece
53
pivotally mounted on the other blade
51
and detachably locked on the locking pin
52
, and a spring
55
mounted between the two handles
54
.
However, connection between the locking piece
53
and the locking pin
52
is not stable so that the locking piece
53
is easily detached from the locking pin
52
so that the two handles
54
of the scissors structure are easily expanded even when not in use, thereby affecting the locking effect of the scissors structure. In addition, the scissors structure is in use, the locking piece
53
is suspended on the blade
51
as shown in phantom lines so that the locking piece
53
is easily in contact with the handles
54
, thereby greatly influencing the operation of the handles
54
and the cutting action of the blades
51
.
The closest prior art of which the applicant is aware is disclosed in U.S. Pat. No. 5,297,343 to Melter et al., filed on Jan. 7, 1993, entitled by “Trimming scissors and sheath assembly”.
When the scissors are in use, the two handles
24
and
28
are separated from each other and the lock button
20
is attached to the handle
24
. However, the lock button
20
freely slidable on the rails
68
and
70
is easily moved forward, thereby easily hindering the relative movement between the two handles
24
and
28
while the lock button
20
is easily broken when the two handles
24
and
28
are moved toward each other, thereby decreasing the lifetime of the scissors
10
. In addition, the compression spring
18
mounted on the rear end of the lock button
20
is located away from the pivot point of the two handles
24
and
28
, thereby easily clipping or injuring the user's hand. Further, the compression spring
18
is mounted on the rear end of the lock button
20
and is located away from the pivot point of the two handles
24
and
28
so that the tension of the two handles
24
and
28
of the scissors
10
is not efficient.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a scissors structure comprising:
a first blade portion including a first handle defining a first chamber having a front end provided with a first locking stub and a rear end provided with a T-shaped first guide rail, the first guide rail having a front end provided with a first guide track located adjacent to the first locking stub and a rear end defining an access opening;
a second blade portion pivotally mounted on the first blade portion and including a second handle defining a second chamber having a front end provided with a second locking stub and a rear end provided with a T-shaped second guide rail provided with a second guide track, at least one snapping boss mounted on the second guide rail and aligning with the access opening of the first guide rail;
a restoring spring mounted between the first handle and the second handle and having a first end secured to the first locking stub and a second secured to the second locking stub; and
a substantially I-shaped locking member slidably mounted between the first guide rail and the second guide rail and having two sides each provided with a T-shaped guide slot for receiving the first guide track of the first guide rail and the second guide track of the second guide rail, the guide slot having two sides each provided with an inward folded retaining flange for limiting the first guide track of the first guide rail and the second guide track of the second guide rail, the retaining flange defining at least one positioning notch for detachably locking the at least one snapping boss.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
REFERENCES:
patent: 5297343 (1994-03-01), Melter et al.
patent: 5987755 (1999-11-01), Shih
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