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US 7,721,636 B2Granted
Hole puncher
AssigneeSDI Corporation
InventorI-Hui Liu
Life of this patent
Estimating the term…
Abstract
A hole puncher has a base, multiple cutter brackets, multiple cutters, multiple springs, a linkage, an activating member and a handle. The base has two ends. The cutter brackets are mounted on the base. The cutters are mounted slidably through the cutter brackets. The linkage connects pivotally to one end of the base. The activating member connects pivotally to the linkage. The handle connects pivotally to the other end of the base and selectively pivots the linkage down. With the linkage and the activating member, the hole punch is effort-saving.
Claims10
A hole puncher comprising:
- a base having
- a front end;
- a rear end;
- a bottom surface;
- a top surface;
- multiple through holes defined through the base in a row;
- a linkage bracket attached to the front end of the base;
- and
- a handle bracket attached to the rear end of the base;
- multiple cutter brackets being hollow, mounted on the base and corresponding respectively to the through holes and each cutter brackets having a guide hole defined through the cutter bracket and aligned with a corresponding through hole in the base;
- multiple cutters corresponding respectively to the cutter brackets, slidably mounted respectively through the guide holes and each cutter having
- a top end;
- a bottom end;
- a blade formed on the bottom end;
- and
- a clasp mounted radially on the cutter and selectively abutting a corresponding cutter bracket;
- multiple springs corresponding respectively to and mounted respectively in the cutter brackets, pressing respectively against the clasps and respectively biasing the cutters up from extending completely through the cutter brackets;
- a linkage connecting to the linkage bracket on the base and having two links being longitudinal, arranged at an interval and connecting pivotally to the linkage bracket, and each link having
- a connecting end connecting pivotally to the linkage bracket;
- and
- a driven end opposite to the connecting end;
- an activating member connecting pivotally to and located between the links of the linkage and having
- a pressing member being flat and slidably abutting the top ends of the cutters;
- and
- an intermediate connecting member formed on the activating member and connecting pivotally and non-slidably to the links;
- and
- a handle connecting pivotally to the handle bracket on the base and selectively driving the driven ends of the links to pivot down and having
- a connection end connecting pivotally to the handle bracket;
- a push end being opposite to the connection end;
- and
- a driving member mounted on the handle near the connection end and connecting to and selectively driving the driven end of the links to pivot down.
28 more elements
Dependencies are inferred from the claim text.