US3173659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety lift
Assignee: Individual
•
Filing: 1963-04-29
•
Granted: 1965-03-16
•
Expires: 1983-04-29
Abstract
No abstract record available.
Inventors
- 👤 George T Hemmeter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:41
CPC Classifications
B; B66; B66F; B66F3/00; B66F3/24; B66F3/25; B66F3/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
A SAFETY LIFT COMPRISING A CYLINDER, A BASE HEAD AT ONE END OF SAID CYLINDER, A GUIDE HEAD AT THE OTHER END OF SAID CYLINDER, AN AIR PISTON RECIPROCABLE IN SAID CYLINDER BETWEEN SAID HEADS, A PISTON TUBE ON SAID GUIDE HEAD, PROJECTING FROM SAID CYLINDER THROUGH SAID GUIDE HEAD, SAID PISTON TUBE HAVING A CIRCUMFERENTIAL GROOVE THEREIN DEFINED BY AN UPPER SHOULDER AND A LOWER SHOULDER, MEANS ON SAID GUIDE HEAD FORMING A CONICAL BASE, AN ARCUATE DETENT MEMBER HAVING AN EXTERIOR CONICAL FACE SLIDABLE ON SAID CONICAL BASE, A DETENT ON THE EXTERIOR OF SAID DETENT MEMBER AND RECEIVABLE IN SAID GROOVE BENEATH SAID UPPER SHOULDER, MEANS ON SAID DETENT MEMBER FORMING A CAM IN THE LIFTING PATH OF SAID LOWER SHOULDER, MEANS AXIALLY MOVABLE ON SAID GUIDE HEAD AND ENGAGING SAID DETENT MEMBER FOR MOVING SAID DETENT MEMBER AXIALLY, AND A SPRING INTERPOSED BETWEEN SAID GUIDE HEAD AND SAID DETENT MEMBER FOR URGING SAID DETENT MEMBER AGAINST SAID AXIALLY MOVABLE MEANS AND FOR FRICTIONALLY RESTRAINING SAID DETENT MEMBER.
Claim 2
Dependent Claim
171 words
A SAFETY LIFT COMPRISING A CYLINDER, A BASE HEAD AT ONE END OF SAID CYLINDER, A GUIDE HEAD AT THE OTHER END OF SAID CYLINDER, AN AIR PISTON RECIPROCABLE IN SAID CYLINDER BETWEEN SAID HEADS, A PISTON TUBE ON SAID GUIDE HEAD, PROJECTING FROM SAID CYLINDER THROUGH SAID GUIDE HEAD, SAID PISTON TUBE HAVING A CIRCUMFERENTIAL GROOVE THEREIN DEFINED BY AN UPPER SHOULDER AND A LOWER SHOULDER, MEANS ON SAID GUIDE HEAD FORMING A CONICAL BASE, AN ARCUATE DETENT MEMBER HAVING AN EXTERIOR CONICAL FACE SLIDABLE ON SAID CONICAL BASE, A DETENT ON THE EXTERIOR OF SAID DETENT MEMBER AND RECEIVABLE IN SAID GROOVE BENEATH SAID UPPER SHOULDER, MEANS ON SAID DETENT MEMBER FORMING A CAM IN THE LIFTING PATH OF SAID LOWER SHOULDER, MEANS AXIALLY MOVABLE ON SAID GUIDE HEAD AND ENGAGING SAID DETENT MEMBER FOR MOVING SAID DETENT MEMBER AXIALLY, AND A SPRING INTERPOSED BETWEEN SAID GUIDE HEAD AND SAID DETENT MEMBER FOR URGING SAID DETENT MEMBER AGAINST SAID AXIALLY MOVABLE MEANS AND FOR FRICTIONALLY RESTRAINING SAID DETENT MEMBER.
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) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |