US 6,981,626 B1
Stapler with a leg-cutting device
Eric Tsai, Ta-Li (Taiwan)
Assigned to Apex Mfg. Co., Ltd., Taichung Hsien (Taiwan)
Filed on Dec. 08, 2004, as Appl. No. 11/6,587.
Int. Cl. B25L 5/02 (2006.01); B27F 7/23 (2006.01)
U.S. Cl. 227—79 19 Claims
OG exemplary drawing
 
17. In a stapler having a main base, a pivotal base pivotally attached to the main base and a leg-cutting device, wherein the leg-cutting device comprises:
an upper base securely attached to the pivotal base and having at least one through hole;
two arm holders securely attached to the pivotal base and extending toward the main base;
two pushing arms pivotally connected to the arm holders respectively and each pushing arm having a sliding end and a pushing end;
a lower base securely attached to the main base, corresponding to the upper base and having an arm-lifting top surface, wherein the sliding ends of the pushing arms are slidably attached to the arm-lifting top surface of the lower base to make the pushing arms to move upward when the pivotal base with the arm holders moves downward;
a cutting pad attached to the upper base and having a bottom and a protrusion extending from the bottom to form a first cutting edge at the bottom and a second cutting edge at the protrusion;
two cutting blocks attached respectively to the pushing ends of the pushing arms and aligning with the at least one through hole in the upper base, and each cutting block having an inclined surface formed on the top of the cutting block at a corner away from the other cutting block;
two guiding blocks slidably mounted on the pivotal base and driven by the cutting blocks to move in a lateral direction while the cutting blocks moves, and each guiding block having a curved guiding top surface formed on the guiding block at one end facing to the other guiding block; and
two biasing members abutting respectively against the guiding blocks to provide the guiding blocks resilient forces.