Jam resistant staple holding track for staplers
US7118019B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 11, 2003 |
| Grant date | Oct 10, 2006 |
| Priority date | — |
| Expiry date | Jan 25, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25C5/1665
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An anti-jamming design for a stapler track provides reduced force to shear a staple from a rack of staples. In stapling, a front staple must be separated from a rack of staples to eject the staple out. Conventional staplers shear the glue that holds the staples together all at once, so the peak force to separate the staple is high. In the present invention the glue that holds staples together in a rack is sheared by a peeling action. Locally progressing sections of glue are peeled as the front staple is sheared from the adjacent second staple. According to one embodiment of the invention progressive shearing is provided by an asymmetric track front end, whereby the front staples are fully supported on one side only so that the staple rack twists as the striker slowly presses down. The striker contacts the supported, higher, side of the staple first and the staple begins to shear from this higher side. When used in a low force spring actuated stapler, the present invention prevents the striker from resting atop the staple in an energized state if the stapling cycle is not properly completed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.