Patent US3604865A successfully refreshed from Google Patents.
US3604865A
Expired / Lapsed
US
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Brake position indicator
Assignee: Goodyear Tire and Rubber Co
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Filing: 1970-05-13
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Granted: 1971-09-14
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Expires: 1990-05-13
Abstract
Abstract A device for indicating when the pads of a disc brake system are in contact with the brake disc. The device automatically compensates for the gradual reduction of thickness of the brake pads through wear. A pin extends rearwardly through the housing, is attached at one end to the piston and carries at its outer end a microswitch. A second pin also extends through the housing parallel to the first pin and contacts the operating lever of the switch as the piston moves toward the disc. The second pin is frictionally retained in the housing and is attached to the piston by a connection which causes movement of the second pin only when the piston moves beyond a predetermined amount.
Inventors
- 👤 Carl E Bricker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:00
CPC Classifications
H; H01; H01H; H01H35/00; F; F16; F16D; F16D66/00; F16D2066/003
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
105 words
A brake position indicator for use on a hydraulic disc brake assembly having a housing and a piston slidably movable within said housing and mounting a brake pad on its outer face, comprising: a first pin connected to said piston for axial movement therewith and extending rearwardly through said housing; a second pin means connecting said second pin to said piston for limited axial movement of said piston relative to said second pin, said second pin extending rearwardly through said housing; and a switch mounted on the end of said first pin and responsive for actuation thereof to the relative position of said second pin.
Claim 2
Dependent Claim
105 words
A brake position indicator for use on a hydraulic disc brake assembly having a housing and a piston slidably movable within said housing and mounting a brake pad on its outer face, comprising: a first pin connected to said piston for axial movement therewith and extending rearwardly through said housing; a second pin means connecting said second pin to said piston for limited axial movement of said piston relative to said second pin, said second pin extending rearwardly through said housing; and a switch mounted on the end of said first pin and responsive for actuation thereof to the relative position of said second pin.
Claim 3
Dependent Claim
18 words
The brake position indicator according to claim 1 wherein said first pin extends coaxially through said second pin.
Claim 4
Dependent Claim
47 words
The brake position indicator according to claim 2 wherein said second pin has an annular flange received within a cylindrical bore within said piston said bore having an annular stop member for engaging said flange of said pin upon movement of said piston beyond a predetermined amount.
Claim 5
Dependent Claim
45 words
A brake position indicator according to claim 3 wherein said predetermined amount of movement of said piston is substantially equal to the distance traveled by said piston from its normally released position to a position in which said brake pad is contacting the brake disc.
Claim 6
Dependent Claim
102 words
In a hydraulic disc brake assemblY having a housing, a piston slidably received in a bore in said housing and mounting a brake pad on its outer face, the improvement comprising: a first pin connected to said piston for axial movement therewith, said first pin extending through said housing; a second pin frictionally retained in said bore in said housing; means for moving said second pin coaxially with said piston when said piston has traveled beyond a predetermined distance; and a switch mounted to one of said pins and responsive for actuation thereof to relative movement between said first and second pins.
Claim 7
Dependent Claim
102 words
In a hydraulic disc brake assemblY having a housing, a piston slidably received in a bore in said housing and mounting a brake pad on its outer face, the improvement comprising: a first pin connected to said piston for axial movement therewith, said first pin extending through said housing; a second pin frictionally retained in said bore in said housing; means for moving said second pin coaxially with said piston when said piston has traveled beyond a predetermined distance; and a switch mounted to one of said pins and responsive for actuation thereof to relative movement between said first and second pins.
Claim 8
Dependent Claim
28 words
The improvement according to claim 5 wherein said predetermined distance is equal to the minimum distance traveled by said piston from the brake-released to the brake-applied position thereof.
Claim 9
Dependent Claim
54 words
The improvement according to claim 6 wherein said switch is a normally open switch having an operating lever mounted on said first pin, movement of said first pin relative to said second pin by a distance equal to said minimum distance causing said second pin to contact the operating lever and close said switch.
References Cited (Backward Citations)
US3223795A
Cited
US3396824A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |