US3556259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fail-safe brake with elastomeric actuator
Assignee: Individual
•
Filing: 1969-03-13
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Granted: 1971-01-19
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Expires: 1989-03-13
Abstract
Abstract An improved fail-safe type of brake is disclosed for engaging rodlike pistons or other driven members for locking them against movement. The brake has a brakeshoe surrounding the rod with an inner friction surface for engaging the rod. The brakeshoe is formed in a number of sections and has its outer surface spaced from an outer housing. The space between the shoe and housing is filled with a compressed resilient elastomer which is attached to the facing surfaces of the brakeshoe and the housing. The compressed elastomer applies a radially inwardly directed braking force on the rod. Relative axial movement between the brakeshoe and the housing by a hydraulic drive in the brake results in a deformation or thinning of the elastomer and the release of the braking force. When the hydraulic drive in the brake is released, the resiliency of the elastomer returns it to its original compressed braking form. The braking force is thus obtained from the compressed elastomer and the deformation of the elastomer by the application of a hydraulic force releases the brake.
Inventors
- 👤 Earle F Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:10
CPC Classifications
F; F16; F16D; F16D49/00; F16D49/18; F15; F15B; F15B15/00; F15B15/20; F15B15/26; F15B15/262
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
130 words
A brake for an elongated, axially movable rod comprising: a brakeshoe surrounding the rod and being mounted for movement radially of the rod; a hollow housing member spaced outwardly from and surrounding the brakeshoe; an elastomeric braking member mounted coaxial to the outer surface of the brakeshoe, said braking member being made of material selected from the group consisting of natural rubber, synthetic rubber and plastic and being positioned between and compressed by the inner wall of the housing member and the outer surface of the brakeshoe whereby it presses the brakeshoe against the rod; and drive means for stretching the braking member axially of the rod whereby it is deformed and has a reduced thickness radially of the rod to remove the pressure of the brakeshoe from the rod.
Claim 2
Dependent Claim
130 words
A brake for an elongated, axially movable rod comprising: a brakeshoe surrounding the rod and being mounted for movement radially of the rod; a hollow housing member spaced outwardly from and surrounding the brakeshoe; an elastomeric braking member mounted coaxial to the outer surface of the brakeshoe, said braking member being made of material selected from the group consisting of natural rubber, synthetic rubber and plastic and being positioned between and compressed by the inner wall of the housing member and the outer surface of the brakeshoe whereby it presses the brakeshoe against the rod; and drive means for stretching the braking member axially of the rod whereby it is deformed and has a reduced thickness radially of the rod to remove the pressure of the brakeshoe from the rod.
Claim 3
Dependent Claim
135 words
A brake for an axially movable cylindrical rod comprising the combination of: a generally cylindrical brakeshoe surrounding said rod and having axial slot means for permitting the shoe to be forced radially inwardly in gripping engagement with the rod; a hollow member having a generally cylindrical surface spaced radially outwardly from and surrounding said brakeshoe; an elongated hollow generally cylindrical elastomeric braking member made of material selected from the group consisting of natural rubber, synthetic rubber and plastic positioned between and compressed by and attached to facing outer and inner surfaces of said brakeshoe and said hollow member respectively; and hydraulic power means for stretching said braking member by relatively moving the brakeshoe and hollow member axially and thereby reducing the radial thickness of the braking member and releasing its compressive force on the brakeshoe.
Claim 4
Dependent Claim
135 words
A brake for an axially movable cylindrical rod comprising the combination of: a generally cylindrical brakeshoe surrounding said rod and having axial slot means for permitting the shoe to be forced radially inwardly in gripping engagement with the rod; a hollow member having a generally cylindrical surface spaced radially outwardly from and surrounding said brakeshoe; an elongated hollow generally cylindrical elastomeric braking member made of material selected from the group consisting of natural rubber, synthetic rubber and plastic positioned between and compressed by and attached to facing outer and inner surfaces of said brakeshoe and said hollow member respectively; and hydraulic power means for stretching said braking member by relatively moving the brakeshoe and hollow member axially and thereby reducing the radial thickness of the braking member and releasing its compressive force on the brakeshoe.
Claim 5
Dependent Claim
38 words
The brake as claimed in claim 2 in which said hydraulic power means comprises a hydraulically driven pistonlike member, and means coupling said brakeshoe to said pistonlike member including means permitting axial and radial movement of said brakeshoe.
Claim 6
Dependent Claim
110 words
A brakeshoe for an axially movable rod comprising the combination of: a brakeshoe surrounding said rod; a hollow member spaced outwardly from and surrounding said brakeshoe; an elastomeric braking member made of material selected from the group consistiNg of natural rubber, synthetic rubber and plastic positioned between, secured to and compressed by said brakeshoe and said hollow member and normally pressing said shoe radially into braking engagement with said rod; and power means for stretching said braking member by relatively moving the brakeshoe and the hollow member axially in one direction and thereby reducing the radial thickness of the braking member and releasing its radially inward force on the brakeshoe.
Claim 7
Dependent Claim
110 words
A brakeshoe for an axially movable rod comprising the combination of: a brakeshoe surrounding said rod; a hollow member spaced outwardly from and surrounding said brakeshoe; an elastomeric braking member made of material selected from the group consistiNg of natural rubber, synthetic rubber and plastic positioned between, secured to and compressed by said brakeshoe and said hollow member and normally pressing said shoe radially into braking engagement with said rod; and power means for stretching said braking member by relatively moving the brakeshoe and the hollow member axially in one direction and thereby reducing the radial thickness of the braking member and releasing its radially inward force on the brakeshoe.
Claim 8
Dependent Claim
27 words
The brake as claimed in claim 4 in which said brakeshoe and said hollow member have facing surfaces flared with respect to the axis of said rod.
Claim 9
Dependent Claim
17 words
The brake as claimed in claim 4 in which said power means comprises a hydraulically operated means.
Claim 10
Dependent Claim
26 words
The brake as claimed in claim 4 in which said power means comprises an expandable bladder adapted for connection to a source of fluid under pressure.
Claim 11
Dependent Claim
32 words
The brake as claimed in claim 4 in which said brakeshoe and said hollow member have cylindrical outer and inner facing surfaces respectively and said elastomeric braking member comprises a hollow cylinder.
Claim 12
Dependent Claim
26 words
The brake as claimed in claim 4 in which said securement between said elastomeric braking member and said brakeshoe and hollow member comprises physically interlocked portions.
Claim 13
Dependent Claim
39 words
The brake as claimed in claim 4 in which said brakeshoe has a flared outer surface and the inner surface of said hollow member has a complementary flared shape, and said elastomeric braking member is a hollow truncated cone.
Claim 14
Dependent Claim
57 words
The brake as claimed in claim 4 which further comprises a second brakeshoe and a second elastomeric braking member positioned for providing relative axial movement between said second brakeshoe and said hollow member, and additional power means for stretching said second braking member by relatively moving the second brakeshoe and hollow member axially in the opposite direction.
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |