US Patent: 376,396 - Pipe Wrench


	Home\| FAQ	Search:Advanced\|Person\|Company\| Type\|Class	Login


Quick search:	Patent number:	Patent Date:

US Patent: 376,396

Pipe Wrench

Patentee:

Daniel R. Porter (exact or similar names) - Chelsea, MA

USPTO Classifications:

81/150, 81/92

Tool Categories:

wrenches : pipe wrenches

Assignees:

William E. Davidson - Boston, MA

Manufacturer:

Not known to have been produced

Witnesses:

Patent Dates:
Applied:	May 04, 1887
Granted:	Jan. 10, 1888

Patent Pictures:

Daniel R. Porter patent January 10, 1888

USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Stan Schulz

Description:

The base of the sliding jaw is wedge shaped, and clamped in place by collar with a thumb screw. The extra length of the jaw from the jaw face to the clamp allows for spring action for the jaws to grip and release.

The April 26, 1910 SHAW (pat. no. 956,280) and March 9, 1920 Frederick E. Walden "WAL-PAT" (pat. no. 1,333,517) have a similar spring action between the jaws.