US3709546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conduit puller
Assignee: Individual
•
Filing: 1970-07-20
•
Granted: 1973-01-09
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Expires: 1990-07-20
Abstract
Abstract A device adapted to be inserted into one end of a conduit and for releasably engaging the inner surface of the conduit to allow the latter to be pulled by the device in one direction. The device has a cam member, a number of toothed elements slidable along the cam member and frictionally engageable with the inner surface of the conduit, and means for forcing the elements along the member to move the elements radially outwardly thereof effectively increase the diameter of the elements.
Inventors
- 👤 D Vaughan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:13
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/10; B66C1/42; B66C1/44; B66C1/54; Y; Y10; Y10T; Y10T279/00; Y10T279/10; Y10T279/1037; Y10T279/1041; Y10T279/1054; Y10T279/1058
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
163 words
A conduit puller comprising: a shaft; a member mounted on the shaft and having a cam surface extending away from the shaft at a predetermined angle; a pair of conduit-engaging elements; means coupled with the elements for yieldably holding the same in sliding engagement with said cam surface, the latter having a configuration permitting the elements to shift radially with respect to the shaft as the elements move longitudinally thereof; a tubular body surrounding the shaft and movable along the same; a coil spring surrounding the shaft within the body, said spring normally being under compression and in engagement with one end of the body to force the latter against the ends of said elements to thereby cause the latter to be biased in a direction to cause the elements to shift radially outwardly with respect to the shaft; and means on the body for connecting the end of each element thereto, whereby the elements and the body move together along the shaft.
Claim 2
Dependent Claim
163 words
A conduit puller comprising: a shaft; a member mounted on the shaft and having a cam surface extending away from the shaft at a predetermined angle; a pair of conduit-engaging elements; means coupled with the elements for yieldably holding the same in sliding engagement with said cam surface, the latter having a configuration permitting the elements to shift radially with respect to the shaft as the elements move longitudinally thereof; a tubular body surrounding the shaft and movable along the same; a coil spring surrounding the shaft within the body, said spring normally being under compression and in engagement with one end of the body to force the latter against the ends of said elements to thereby cause the latter to be biased in a direction to cause the elements to shift radially outwardly with respect to the shaft; and means on the body for connecting the end of each element thereto, whereby the elements and the body move together along the shaft.
Claim 3
Dependent Claim
41 words
A puller as set forth in claim 1, wherein said connecting means includes an annular flange, each element having a groove therein adjacent to said body, the flange extending into the grooves of the elements and being radially shiftable relative thereto.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |