Patent FR1189403A successfully refreshed from Google Patents.
Patent US3575087A successfully refreshed from Google Patents.
US3575087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locking cylinder
Assignee: LOURDES IND Inc
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Filing: 1968-11-18
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Granted: 1971-04-13
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Expires: 1988-11-18
Abstract
Abstract A hydraulic cylinder and piston designed to move a load to a desired position and to lock in that position for extended periods of time, until released, even though fluid pressure to the cylinder may be interrupted, as by leakage or a break in the supply line, the locking being effected by the frictional engagement of one or more collets with the piston rod under the influence of one or more spring-biased collet closure rings.
Inventors
- 👤 Walter A Sherwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:38
CPC Classifications
F; F41; F41A; F41A23/00; F41A23/56; F15; F15B; F15B15/00; F15B15/20; F15B15/26; F15B15/262; F16; F16B; F16B1/00; F16B1/02; F16B4/00; F16B4/002; F41A23/50; F41F; F41F3/00; F41F3/04; F41F3/052
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
167 words
A shaft slidable through a housing to selected adjusted positions with respect to said housing in combination with releasable locking means adapted to hold the shaft in each adjusted position against an applied axial load comprising, a fixed abutment within the housing, a plurality of collets bearing against the shaft, each collet having at least one beveled outer surface, at least one compression ring having a beveled inner surface complementary to and bearing against the beveled outer surface of an adjacent collet, resilient drive means biased to urge said collets and ring toward said abutment and into shaft locking position, the collet nearest said drive means engaging tightly with the shaft and transmitting additional locking force from the shaft to an adjacent collet the locking force applied representing the sum of the forces developed and transmitted by the arrangement of the components of said locking means in cooperation with said shaft, and unlocking means adapted to be actuated to counter act the bias of said drive means.
Claim 2
Dependent Claim
167 words
A shaft slidable through a housing to selected adjusted positions with respect to said housing in combination with releasable locking means adapted to hold the shaft in each adjusted position against an applied axial load comprising, a fixed abutment within the housing, a plurality of collets bearing against the shaft, each collet having at least one beveled outer surface, at least one compression ring having a beveled inner surface complementary to and bearing against the beveled outer surface of an adjacent collet, resilient drive means biased to urge said collets and ring toward said abutment and into shaft locking position, the collet nearest said drive means engaging tightly with the shaft and transmitting additional locking force from the shaft to an adjacent collet the locking force applied representing the sum of the forces developed and transmitted by the arrangement of the components of said locking means in cooperation with said shaft, and unlocking means adapted to be actuated to counter act the bias of said drive means.
Claim 3
Dependent Claim
33 words
The shaft locking combination according to claim 1 in which the fixed abutment is provided with a beveled inner surface complementary to and bearing against the beveled outer surface of an adjacent collet.
Claim 4
Dependent Claim
31 words
The shaft locking combination according to claim 2 in which each collet has two oppositely facing beveled outer surfaces and at least one compression ring has oppositely facing beveled inner surfaces.
Claim 5
Dependent Claim
32 words
The shaft locking combination according to claim 3 which includes a second coMpression ring having a single beveled inner surface complementary to and bearing against a beveled outer surface of a collet.
Claim 6
Dependent Claim
22 words
The shaft locking combination according to claim 1 in which the resilient drive means is a spring under less than maximum compression.
Claim 7
Dependent Claim
99 words
The shaft locking combination according to claim 1 in which the fixed abutment is located intermediate the ends of the housing and which includes a plurality of collets as claimed on each side of said fixed abutment, at least one compression ring as claimed on each side of the abutment, resilient drive means as claimed on each side of the abutment, and in which the unlocking means is associated with said abutment, the respective beveled surfaces on one side of the fixed abutment being disposed oppositely with respect to the beveled surfaces on the other side of the abutment.
Claim 8
Dependent Claim
35 words
The shaft locking combination according to claim 6 in which the fixed abutment is provided with beveled inner surfaces on each side complementary to and bearing against the beveled outer surface of an adjacent collet.
Claim 9
Dependent Claim
36 words
The shaft locking combination according to claim 7 in which each collet has two oppositely facing beveled outer surfaces and at least one compression ring on each side of the abutment has oppositely beveled inner surfaces.
Claim 10
Dependent Claim
39 words
The shaft locking combination according to claim 8 which includes a second compression ring on each side of the abutment and having a single beveled inner surface complementary to and bearing against a beveled outer surface of a collet.
Claim 11
Dependent Claim
22 words
The shaft locking combination according to claim 6 in which the resilient drive means is a spring under less than maximum compression.
Claim 12
Dependent Claim
42 words
The shaft locking combination according to claim 1 in which each collet has a single beveled outer surface and a flat radially disposed side face and each compression ring has a single beveled inner surface and a flat radially disposed side face.
Claim 13
Dependent Claim
33 words
The shaft locking combination according to claim 11 in which the fixed abutment is provided with a beveled inner surface complementary to and bearing against the beveled outer surface of an adjacent collet.
Claim 14
Dependent Claim
99 words
The shaft locking combination according to claim 11 in which the fixed abutment is located intermediate the ends of the housing and which includes a plurality of collets as claimed on each side of said fixed abutment, at least one compression ring as claimed on each side of the abutment, resilient drive means as claimed on each side of the abutment, and in which the unlocking means is associated with said abutment, the respective beveled surfaces on one side of the fixed abutment being disposed oppositely with respect to the beveled surfaces on the other side of the abutment.
Claim 15
Dependent Claim
35 words
The shaft locking combination according to claim 13 in which the fixed abutment is provided with beveled inner surfaces on each side complementary to and bearing against the beveled outer surface of an adjacent collet.
Claim 16
Dependent Claim
26 words
The shaft locking combination according to claim 1 which includes a hydraulic cylinder and piston, said slidable shaft being a piston rod attached to said piston.
References Cited (Backward Citations)
US2348764A
Cited
US2632425A
Cited
US2808903A
Cited
US3009747A
Cited
US3203513A
Cited
US3176590A
Cited
US3353455A
Cited
US3429233A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |