Self-aligning caliber bar
US4773164A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 1987 |
| Grant date | Sep 27, 1988 |
| Priority date | — |
| Expiry date | Jun 8, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF41G1/54
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A caliber bar for locating the centerline of the bore at the muzzle of a gun including a frame, first and second trunnion housings axially mounted on the frame, each of the trunnion housings pivotally mounting three centering arms circumferentially spaced at 120.degree. from each other for contacting the side of a bore at axially spaced locations, and first and second liquid springs mounted on the first and second trunnion housings, respectively, for biasing the centering arms associated with each trunnion housing simultaneously outwardly equal amounts into engagement with the side of the bore, and detents for removably holding the first and second trunnion housings in the frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.