Cutlery – Cutting tools – Plural cooperating blades
Reexamination Certificate
2003-04-07
2004-07-06
Peterson, Kenneth E. (Department: 3724)
Cutlery
Cutting tools
Plural cooperating blades
C030S179000, C030S229000, C030S233000, C030S286000, C030S293000
Reexamination Certificate
active
06757978
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to scissors and more particularly to a pair of scissors for angularly cutting a sheet stock (e.g., plastic steel, plastics, wood, etc.) with improved characteristics.
BACKGROUND OF THE INVENTION
A pair of conventional scissors for angularly cutting a sheet stock (e.g., plastic steel, plastics, wood, etc.) is shown in FIG.
6
. The scissors comprises a lower handle unit
11
having a U-shaped section, the lower handle unit
11
comprising aligned apertures
111
in the forward, aligned, elongated slots
112
behind the apertures
111
, a block
113
disposed in the slots
112
, aligned small apertures
114
below the slots
112
, an elongate member
116
, and a rivet
115
inserted through a rearward hole of the elongate member
116
and the apertures
114
for causing the elongate member
116
to be pivotal about the rivet
115
by manipulating a forward knob
117
of the elongate member
116
; a blade
12
comprising a forward cutting edge
121
, a rearward notch
123
, the block
113
being disposed laterally across the slots
112
and the notch
123
, an intermediate aperture
122
, and a pin
124
inserted through the apertures
111
and
122
; an upper handle unit
13
having a U-shaped section, the upper handle unit
13
comprising a forwardly projecting, channel-shaped arm
131
, aligned apertures
132
in the forward, two openings
133
in the rear, a bolt
14
driven through the aligned openings
133
, the apertures
122
and a washer
141
to be fastened by a cap nut
141
, and a bottom recess
134
at the rear end of the arm
13
, the recess
134
being adapted to lock the elongate member
116
; an elongate, resilient piece
15
having a hole
151
in the rear fastened to the upper handle unit
13
by a rivet, the resilient piece
15
having a forward end disposed in the lower handle unit
11
; a board
16
of sector-shaped comprising a lower ridge
161
disposed in the channel of the arm
131
, a number of apertures
162
through the ridge
161
in which one of the apertures
162
is aligned with the apertures
132
, a bolt
163
driven through washers
164
, the apertures
132
, and the aperture
162
to be fastened by a cap nut
165
, a central slit
166
, a cut
167
at the rearward end of the slit
166
, the cut
167
being urged against arcuate top sides of the arm
131
, and a plurality of equally spaced lines
168
originated from about the cut
167
. In operation, place a sheet member formed of plastic steel, plastics, or wood on the board
16
. Next, position the sheet member on the board
16
by aligning one side of the sheet member with one of the lines
168
. Next, close the blade
12
on the sheet member by working the lower and upper handle units
11
and
13
against each other. Finally, the sheet member is angularly cut.
However, the prior art suffered from several disadvantages. For example, the sheet member tends to slip forward in the cutting process. This condition is particularly significant when the sheet member is relatively thick. In a case that the sheet member is formed of wood fiber the cut portion of the sheet member may squeeze toward the forward, uncut portion thereof. Hence, more force is required to cut the sheet member completely. Also, an uneven surface is formed on the cut portion of the sheet member, resulting in detraction from the sheet member's external appearance. Hence, a need for improvement exists.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a pair of scissors for angularly cutting a sheet stock comprising an upper handle unit of U-shaped, the upper handle unit comprising a forwardly projecting, channel-shaped arm, forward apertures, and intermediate apertures; a lower handle unit of U-shaped, the lower handle unit comprising a channel-shaped forward arm having forward apertures, rivet apertures in a rear of the forward apertures thereof, first apertures below the rivet apertures, and oblique slots in a rear of the first and the rivet apertures; a blade comprising a cutting edge, a first aperture, and a rearward rivet aperture; a board of sector-shaped comprising a flat top, a lower ridge having a rear projected end, an elongate slot in a rear of the ridge, and an aperture in a forward of the ridge; a pair of fasteners each having an enlarged head and a shank; and an elongate, resilient piece disposed in the upper handle unit; wherein in assembly the forward apertures of the upper handle unit is aligned with the aperture of the board after placing the ridge in the arm of the upper handle unit with the flat top supported on the arm of the upper handle unit, insert first pins through the forward apertures of the upper handle unit and the aperture of the board to cause the board to pivotal about the upper handle unit, the elongate slot is aligned with the first apertures of the lower handle unit prior to inserting a second pin through the first apertures of the lower handle unit and the elongate slot with the head of the second pin urged against the first aperture of the lower handle unit, insert a rivet through the rivet apertures of the lower handle unit and the rivet aperture of the blade for fastening, the first aperture of the blade is aligned with the forward apertures and intermediate apertures of the upper handle unit after placing the arm of the lower handle unit in the arm of the upper handle unit and placing the blade in the arm of the lower handle unit sequentially, pivotably fasten the lower and the upper handle units and the blade together by inserting third pins through the forward apertures of the lower handle unit, the intermediate apertures of the upper handle unit, and the first aperture of the blade, the shanks of the fasteners are inserted into the oblique slot to be defined therein, and the heads of the fasteners are slidably urged against the oblique slot; for closing the scissors hold the lower and the upper handle units to apply force toward each other, the lower and the upper handle units are operative to close each other by pivoting about the third pins, the board and the cutting edge close on the sheet stock to be cut on the flat top by pivoting about the first pins in response to pivoting the upper handle unit, the flat top and the blade close on each other by pivoting about the first pins in response to pivoting the lower handle unit, a rear end of the elongate slot contacts the second pin as the fasteners have slid to a lowest point in the oblique slot to be urged by the ridge so that the ridge is prevented from further rearward movement with energy stored in the resilient piece; for opening the scissors push the fasteners to a highest point in the oblique slot prior to loosening a grip on the lower and the upper handle units, the stored energy of the resilient piece is applied on the blade to expand the lower and the upper handle units away from each other, the cutting edge and the flat top pivot about the first and the third pins respectively to open an opening therebetween, a forward end of the elongate slot contacts the second pin, and form a gap between a forward end of the blade and that of the flat top; and in a cutting operation press the lower and the upper handle units against each other for causing the board and the blade to close on the sheet stock, the ridge pivots in response to pivoting the lower handle unit, the second pin slides along the elongate slot to move the ridge, a rear portion of the flat top moves upward, and a pointed end of the blade closes on a forward end of the flat top. By utilizing this, the sheet stock can be smoothly, evenly cut by the blade.
The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings.
REFERENCES:
patent: 2709298 (1955-05-01), Mater
patent: 4106195 (1978-08-01), Berg
patent: 5542182 (1996-08-01), Martinez
patent: 5673487 (1997-10-01), Malagnoux
patent: 5913575 (1999-06-01), Lai
patent: 6308421 (2001-10-01), Wang
patent: 6532847
Flores Sánchez Omar
Peterson Kenneth E.
Pro-Techtor Inter-national Services
LandOfFree
Scissors for angularly cutting sheet stock does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Scissors for angularly cutting sheet stock, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scissors for angularly cutting sheet stock will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3254930