Hole punch element
AssigneeWorkTools, Inc.
InventorJOEL S. MARKS
Life of this patent
Estimating the term…
Abstract
A hole punch device that reduces the force required to create a hole in papers or other sheet media. A punch element of the hole punch device includes a locally sloped or indented floor to create a bend in the sheet media as it is punched to create an enlarged, oval hole. The punch pin may include an expanding sleeve surround the pin that forms a larger diameter during the cutting stroke and springs back to a smaller diameter during a pull out stroke. A coiled torsion return spring is positioned remotely from and non-coaxially with the punch pin. A keyed pin and support frame arrangement ensures a predetermined rotational orientation of the pin for sequential cutting for reduced cutting force. A long lead-in surface in the frame helps installing sheet media into the feed slot of the punch element.
Claims20
A hole punch device for creating holes in paper sheets within the device, comprising:
- a substantially cylindrical punch pin having a pin axis;
- a frame guiding the punch pin along the pin axis, wherein the frame includes a base having a surface;
- a slot in the frame, wherein the slot includes a ceiling and a floor, the floor including an anvil cavity and a floor portion for a paper path with an offset surface contour, and wherein the floor coincides with the surface of the base of the frame;
- the paper sheets normally extending remotely from the pin in a perpendicular direction to the pin axis;
- and
- wherein the punch pin at a lowest position at least partially extends into the anvil cavity, and the punch pin presses the paper within the slot against the base so that the paper sheets, exclusive of a location within the anvil cavity, are forced to bend at the pin in relation to the perpendicular direction to follow the offset surface contour of the slot.
A hole punch device for creating holes in paper sheets within the device, comprising:
- a substantially cylindrical punch pin having a pin axis;
- a frame guiding the punch pin along the pin axis;
- a slot in the frame, wherein the slot includes a ceiling and a floor, the floor including an anvil cavity and a floor portion supporting a paper path with an offset surface contour;
- the ceiling adjacent the pin extends perpendicular to the pin axis;
- the paper path extending remotely from the pin in a perpendicular direction to the pin axis;
- and
- wherein the punch pin at a lowest position at least partially extends into the anvil cavity, the punch pin moves within the slot toward the offset surface contour of the floor so that the paper path is confined by the pin to become kinked at the offset surface contour.
Dependencies are inferred from the claim text.