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US 5,511,313 AGranted
Pneumatic powered pinking shears
AssigneePatricia D. Yoder
InventorsPatricia D. Yoder, Andrew D. McGraw
Life of this patent
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Abstract
An electric/pneumatic pinking shear with one touch button blade closure. The blades In these shears are shorter than previous blades because of the twisting and bending moments of long thin blades. The bending moments of the blades have been reduced so that shear tension between the blades can be kept to a minimum. The teeth on the blades are wider than other pinking shears in order to improve the quality of the finished cut. This will decrease the amount of thread unraveling after the fabric is cut.
Claims13
A power pinking device, comprising:
- (a) A hollow casing;
- (b) means for providing a source of compressed gas;
- (c) pneumatic power drive means;
- (d) a stationary lower cutting blade secured to said hollow casing, which lower cutting blade has a serrated cutting edge having a plurality of teeth of predetermined height;
- (e) an upper movable cutting blade pivotally connected to said stationary blade and having a serrated cutting edge having a plurality of teeth of predetermined height, whose teeth are positioned to interdentate with the teeth of said lower cutting blade in a serrated shearing action;
- and
- (f) means for operatively coupling said upper blade to said pneumatic power drive means for oscillation of said upper blade when said pneumatic power drive means is actuated, said means comprising a connecting rod having a distal end and a proximal end, which connecting rod is fixably attached to said piston at its proximal end;
- a connecting arm having a distal end and a proximal end;
- a slotted connecting arm guide;
- wherein said connecting rod defines a bore in its distal end for receiving a pin that permits movable attachment of said connecting arm hingeably with respect to said connecting rod;
- said connecting arm defines bores in both its distal and proximal ends for receiving pins that permit movable attachment of said connecting arm hingeably with respect to said connecting rod and with respect to said upper cutting blade;
- the movement of said connecting arm being constrained in a vertical path by the slot of said connecting arm guide.
9 more elements
Dependencies are inferred from the claim text.