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US3729070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manual release mechanism for an emergency and parking brake
Assignee: DBA SA
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Filing: 1971-05-04
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Granted: 1973-04-24
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Expires: 1991-05-04
Abstract
Abstract Manual release mechanism for an emergency and parking brake control system utilizing a fluid pressure operated spring cylinder, a transmission cable stretched between the piston contained in this cylinder and a brake control lever being guided by a sheath, the ends of said sheath taking anchor on a pair of stops respectively connected to stationary parts. The mechanism comprises two relatively slidable members, one connected to one of the stops, the other one connected to the adjacent stationary part, these members being normally locked in the position of their maximum extension. Release of the emergency brake is obtained by releasing the locked members, thus allowing the stop of the sheath to move to a position in which the tension of the cable is relieved. One of the members can be a socket connected to the cylinder body, the other member being then a plug connected to the stop and slidably received in the socket, a projection on the plug and a notch in the socket allowing these members to be mutually locked or unlocked when one of the members is rotated while the projection is facing the notch. Embodiments are described in which re-locking of the members occurs automatically upon reinstating fluid pressure in the spring cylinder.
Inventors
- 👤 Marchand C Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:54
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/08; B60T17/085; B60T17/086
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
187 words
In a vehicle, a braking system having a mechanical actuator and fluid pressure responsive means including resilient means for actuating said mechanical actuator comprising: said fluid pressure responsive means including a housing carried by said vehicle defining a chamber therewithin and a fluid pressure responsive piston slidably mounted in said chamber, flexible means operatively connecting said piston with said mechanical actuator for operating the latter, said resilient means yieldably urging said piston to a first position actuating said mechanical actuator; and a manual release mechanism for releasing said mechanical actuator when said piston is disposed in said first position, said release mechanism including a sheath for guiding said cable means, means securing one end of said sheath to a fixed portion of the vehicle, means securing the other end of said sheath to said vehicle, said last-mentioned means including first and second members movable relative to one another in an axial direction, said first member being carried by a fixed portion of the vehicle and said second member being carried on said sheath, and locking means normally maintaining said members in the position of their maximum extension.
Claim 2
Dependent Claim
187 words
In a vehicle, a braking system having a mechanical actuator and fluid pressure responsive means including resilient means for actuating said mechanical actuator comprising: said fluid pressure responsive means including a housing carried by said vehicle defining a chamber therewithin and a fluid pressure responsive piston slidably mounted in said chamber, flexible means operatively connecting said piston with said mechanical actuator for operating the latter, said resilient means yieldably urging said piston to a first position actuating said mechanical actuator; and a manual release mechanism for releasing said mechanical actuator when said piston is disposed in said first position, said release mechanism including a sheath for guiding said cable means, means securing one end of said sheath to a fixed portion of the vehicle, means securing the other end of said sheath to said vehicle, said last-mentioned means including first and second members movable relative to one another in an axial direction, said first member being carried by a fixed portion of the vehicle and said second member being carried on said sheath, and locking means normally maintaining said members in the position of their maximum extension.
Claim 3
Dependent Claim
76 words
The invention of claim 1: said first member being a socket carried by said housing, said second member being a plug slidably received by one end of said socket, said locking means being operable by rotating said plug from a first position maintaining said members at their maximum extension to a second position permitting the plug to withdraw into said socket, and a rod carried by said piston extending through the other end of said socket.
Claim 4
Dependent Claim
115 words
The invention of claim 2: said locking means including means projecting from the outer surface of said plug, and axially extending grooves with said socket for receiving said projecting means, ribs separating said grooves, said ribs terminating within said socket to define a circumferentially extending cavity between the end of the grooves and the one end of the socket, said plug being rotatable from said first position in which the projecting means engage the ends of said ribs defining said cavity to thereby lock said plug against movement relative to the socket to a second position in which the projecting means are aligned with the grooves to permit the plug to withdraw into said socket.
Claim 5
Dependent Claim
99 words
The invention of claim 2: said locking means includIng means projecting from the outer surface of said plug, and axially extending grooves within said socket cooperating with said projecting means, a sleeve disposed between the plug and the socket having an axially extending slot means receiving said projecting means and detents cooperating with said projecting means to lock said plug against movement relative to the socket, said sleeve being secured against movement axially with respect to said members but rotatable about its axis, and resilient means yieldably rotating said sleeve to urge said projections into engagement with said detents.
Claim 6
Dependent Claim
35 words
The invention of claim 4: said detents being circumferential recesses located at the ends of said slots in said sleeve, said socket being rotatable to align said projections with said slots and with said grooves.
Claim 7
Dependent Claim
37 words
The invention of claim 4: said locking means including ribs separating said grooves, said ribs terminating within said socket to define a circumferential cavity between the ends of the ribs and said one end of the socket.
Claim 8
Dependent Claim
85 words
The invention of claim 2: said locking means including an annular groove on said plug, said socket being restricted from movement axially with respect to said plug but being rotatable about its axis, an articulated segment pivotally mounted on said housing and adapted to be received within said annular groove and being operably connected to said socket so that rotation of the latter drives the segment into said groove, and resilient means yieldably rotating said segments in a direction driving the latter into the groove.
Claim 9
Dependent Claim
29 words
The invention of claim 7: the connection between the segment and the socket including a projecting member on said segment, said socket having a slot receiving said projecting 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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |