Heavy duty stapler

Abstract

A stapler comprising a base defining a horizontal plane, a cartridge assembly coupled to the base at a cartridge attachment point, the cartridge assembly including a ram, and a lever arm pivotally coupled to the base at a lever pivot axis. The lever arm includes a grip at one end for receiving a manual input from a user, and the lever arm is coupled to the ram at a ram input in order to provide a drive force. The stapler includes an inherent force factor, calculated as the horizontal distance from the lever pivot axis to the end of the lever arm divided by the horizontal distance from the lever pivot axis to the ram input, of is at least 3.8. Preferably, the lever arm defines an effective lever axis that is at least about 65° offset from the ram axis when in the static position. When stapling, the effective lever axis is preferably greater than about 95° when the lever arm is compressed to the fully stapled position.

Dependencies are inferred from the claim text.