Effort-saving hand operated punching device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 7, 2012
Grant Date -
May 27, 2010
app pub date -
Nov 26, 2008
filing date -
Nov 26, 2008
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hole punching device includes two first punching members and a second punching member intermediate the two first punching members. First, second and third lever arms are adapted to render one of the two first punching members, another of the two first punching members and the second punching member to press holes in sheets respectively. The first lever arm has a longitudinal length longer than those of the second and third lever arms, with the second lever arm being longer than that of the third lever arm. Further, the first lever arm actuates the second and third lever arms upon depression of the hole punching device.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully