US4069586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Center punch
Assignee: Individual
•
Filing: 1976-05-19
•
Granted: 1978-01-24
•
Expires: 1996-05-19
Abstract
Abstract A center punch particularly adapted for locating and marking the center position of a circular opening, as for making a center mark in a stud that has been broken off below the surface, to facilitate drilling and removing the stud. Movable jaws are each provided with an end portion of reduced thickness that extends into the opening adjacent the stud and a shoulder that abuts the exposed surface to retain the punch in a center position.
Inventors
- 👤 Horace C. Skelton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:45
CPC Classifications
B; B25; B25D; B25D5/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
94 words
A center punch comprising a tubular barrel having a plurality of parallel slots extending from one and thereof thereby to define a plurality of spaced circumferentially-positioned jaws, each of said jaws having a tapered external surface, a punch member having a point at one end thereof, means slidably retaining said punch member for longitudinal movement within said barrel, and clamping means releasably forcing said jaws inward comprising a collar in threaded engagement with said barrel and in compressive engagement with said tapered surfaces whereby adjustment of said collar causes radial movement of said jaws.
Claim 2
Dependent Claim
94 words
A center punch comprising a tubular barrel having a plurality of parallel slots extending from one and thereof thereby to define a plurality of spaced circumferentially-positioned jaws, each of said jaws having a tapered external surface, a punch member having a point at one end thereof, means slidably retaining said punch member for longitudinal movement within said barrel, and clamping means releasably forcing said jaws inward comprising a collar in threaded engagement with said barrel and in compressive engagement with said tapered surfaces whereby adjustment of said collar causes radial movement of said jaws.
Claim 3
Dependent Claim
25 words
A center punch as claimed in claim 1 including a spring arranged to bias said punch member longitudinally in a direction away from said jaws.
Claim 4
Dependent Claim
55 words
A center punch as claimed in claim 1 wherein each of said jaws includes a shoulder on its outer surface adjacent but spaced from the free end of said jaws, each of said shoulders forming a surface perpendicular to the longitudinal axis of said barrel, all of said shoulder surfaces lying in a common plane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |