Patent US3789738A successfully refreshed from Google Patents.
US3789738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extensible piston
Assignee: Bendix Corp
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Filing: 1972-03-24
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Granted: 1974-02-05
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Expires: 1992-03-24
Abstract
Abstract A fluid pressure actuated piston having an outer piston member and an inner piston member slidable therein which pistons have equivalent areas exposed to said fluid pressure and are sequentially pressurized thereby providing extended piston travel. The outer piston is operatively connected to a normally closed fluid vent which is opened to vent the pressurized fluid to the inner piston substantially simultaneously with engagement of the outer piston with a fixed stop whereupon the inner piston continues to move.
Inventors
- 👤 R Horner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:22
CPC Classifications
F; F16; F16D; F16D55/00; F16D55/24; F16D55/26; F16D55/36; F16D55/40; F15; F15B; F15B15/00; F15B15/08; F15B15/14; F15B15/16; F16D65/00; F16D65/14; F16D65/16; F16D65/18; F16D2055/0004; F16D2055/0058; F16D65/78; F16D2065/785; F16D2121/00; F16D2121/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
240 words
Extensible fluid pressure actuated piston means particularly adapted for use in a multiple disc aircraft disc brake provided with fixed piston carrier means providing limited axial travel of a piston carried thereby, said piston means comprising: a source of pressurized fluid; a sleeve threadedly engaged with said piston carrier means and connected to receive said pressurized fluid; a first piston slidably carried in said sleeve and responsive to said pressurized fluid; a second piston slidably carried by said first piston and together with said first piston defining a fluid chamber; a circular stud extending through said first piston and provided with a radially outwardly extending plate at one end thereof which plate is engaged at its radially outermost portion by said sleeve to fixedly secure said stud in position in said piston carrier means; flexible fluid seal means operatively connected to said first piston means for slidable engagement with said stud to provide a fluid seal theRebetween; a reduced diameter section formed on said stud and provided with an adjustable stop member threadedly engaged therewith; said first piston being displaced by said pressurized fluid to a predetermined position defined by said stop member where said fluid seal means registers with said reduced diameter section to vent said pressurized fluid to said chamber; said second piston being responsive to said pressurized fluid vented to said chamber and urged thereby axially away from said first piston to provide a corresponding extension thereof.
Claim 2
Dependent Claim
240 words
Extensible fluid pressure actuated piston means particularly adapted for use in a multiple disc aircraft disc brake provided with fixed piston carrier means providing limited axial travel of a piston carried thereby, said piston means comprising: a source of pressurized fluid; a sleeve threadedly engaged with said piston carrier means and connected to receive said pressurized fluid; a first piston slidably carried in said sleeve and responsive to said pressurized fluid; a second piston slidably carried by said first piston and together with said first piston defining a fluid chamber; a circular stud extending through said first piston and provided with a radially outwardly extending plate at one end thereof which plate is engaged at its radially outermost portion by said sleeve to fixedly secure said stud in position in said piston carrier means; flexible fluid seal means operatively connected to said first piston means for slidable engagement with said stud to provide a fluid seal theRebetween; a reduced diameter section formed on said stud and provided with an adjustable stop member threadedly engaged therewith; said first piston being displaced by said pressurized fluid to a predetermined position defined by said stop member where said fluid seal means registers with said reduced diameter section to vent said pressurized fluid to said chamber; said second piston being responsive to said pressurized fluid vented to said chamber and urged thereby axially away from said first piston to provide a corresponding extension thereof.
Claim 3
Dependent Claim
31 words
Extensible fluid pressure actuated piston means, as claimed in claim 1, wherein: said first piston is provided with a skirt portion; said second piston being slidably contained by said skirt portion.
Claim 4
Dependent Claim
46 words
Extensible fluid pressure actuated means as claimed in claim 2 wherein: said circular stud is provided with a cross sectional area equal to the cross sectional area of said skirt portion to thereby equalize the effective fluid pressure responsive areas of said first and second pistons.
Claim 5
Dependent Claim
37 words
Extensible fluid pressure actuated piston means, as claimed in claim 1, wherein: said first piston is provided with normally closed bleed valve means adapted to be opened to permit retraction of said piston into said first piston.
Claim 6
Dependent Claim
48 words
Extensible fluid pressure actuated piston means, as claimed in claim 1, wherein: said first piston is provided with a central opening through which said stud extends and said recess surrounding said opening; said annular recess adapted to receive an annular flexible fluid seal slidably engaged with said stud.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |