US3701398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid and mechanically actuated disc brake system
Assignee: MR GASKET COMPANY A OH CORP
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Filing: 1970-10-15
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Granted: 1972-10-31
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Expires: 1990-10-15
Abstract
Abstract The invention concerns improvements in a disc brake assembly that comprises: A. FIRST MEANS OPERABLE IN RESPONSE TO CONTROLLED APPLICATION OF FLUID PRESSURE TRANSMITTED FROM A SOURCE TO ADVANCE A BRAKE PART INTO BRAKING ENGAGEMENT WITH A ROTATING DISC, THE BRAKE PART BEING SUBJECT TO WEAR, AND B. SECOND MEANS OPERABLE IN RESPONSE TO PREDETERMINED DECREASE IN SOURCE FLUID PRESSURE TO EFFECT DISPLACEMENT OF SAID BRAKE PART INTO BRAKING ENGAGEMENT WITH SAID DISC AND IRRESPECTIVE OF THE WORN CONDITION OF SAID PART.
Inventors
- 👤 Samuel J Martins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:45
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/38; F16D65/40; F16D65/52; F16D65/54; F16D55/00; F16D55/02; F16D55/22; F16D55/224; F16D2121/00; F16D2121/02; F16D2121/14; F16D2123/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
185 words
In combination: a. a disc brake caliper body, b. a brake pad and a piston and cylinder assembly carried by said body and operable in response to fluid pressure application to the piston to urge the pad against the disc, and c. a ram body having an internal tapered surface and structure coupling said ram body to the piston to urge the latter toward the disc in response to auxiliary force transmission, d. said structure including a piston extension, having a tapered terminal and a wedge element having wedge coupling with both said tapered terminal and the ram body internal tapered surface to accommodate relative shifting of the piston and said extension toward the disc as the pad wears, while maintaining the ram body coupled to said piston extension for auxiliary force transmission, said ram body having a side opening to exteriorly expose said wedge element contained within the ram body for adjustment shifting out of wedge coupling relatIon with said piston extension to permit retraction thereof relatively away from the disc, the ram body projecting openly and free of confinement by the caliper body.
Claim 2
Dependent Claim
185 words
In combination: a. a disc brake caliper body, b. a brake pad and a piston and cylinder assembly carried by said body and operable in response to fluid pressure application to the piston to urge the pad against the disc, and c. a ram body having an internal tapered surface and structure coupling said ram body to the piston to urge the latter toward the disc in response to auxiliary force transmission, d. said structure including a piston extension, having a tapered terminal and a wedge element having wedge coupling with both said tapered terminal and the ram body internal tapered surface to accommodate relative shifting of the piston and said extension toward the disc as the pad wears, while maintaining the ram body coupled to said piston extension for auxiliary force transmission, said ram body having a side opening to exteriorly expose said wedge element contained within the ram body for adjustment shifting out of wedge coupling relatIon with said piston extension to permit retraction thereof relatively away from the disc, the ram body projecting openly and free of confinement by the caliper body.
Claim 3
Dependent Claim
102 words
The combination of claim 1 including a piston stem carried to advance with said piston in response to said application of fluid pressure thereto, there being a support sleeve carried by the cylinder and a spring connected between the cylinder and sleeve to resist stem advancement in the sleeve and to retract the stem relative to the sleeve in response to decreased fluid pressure applicator to the piston, there also being a drag part carried by the cylinder to frictionally resist advancement and retraction of the sleeve, such resistance being overcome by piston induced sleeve displacement to compensate for brake part wear.
Claim 4
Dependent Claim
23 words
The combination of claim 1 including a spring urging the wedge element toward wedge coupling relation with the piston extension and ram body.
Claim 5
Dependent Claim
34 words
The combination of claim 1 wherein said brake pad is carried at one side of the disc, and including another brake pad carried by the caliper body at the opposite side of the disc.
Claim 6
Dependent Claim
42 words
The combination of claim 4 including means mounting the caliper body to shift in opposite directions relative to the disc in order to bring said brake pads into engagement with opposite sides of the disc in response to said fluid pressure application.
Claim 7
Dependent Claim
42 words
The combination of claim 5 including retractor means to retract said piston and to shift said caliper body in response to reduction of said primary braking force, and tending to disengage said braking pads from engagement with opposite sides of the disc.
Claim 8
Dependent Claim
28 words
The combination of claim 1 including auxiliary force transmitting means located to transmit force urging the ram body in a direction to urge the piston toward the disc.
Claim 9
Dependent Claim
17 words
The combination of claim 7 wherein said means includes a lever pivotally connected to said caliper body.
Claim 10
Dependent Claim
19 words
The combination of claim 8 wherein the lever has a fulchrum, and including means to adjustably position said fulchrum.
Claim 11
Dependent Claim
54 words
The combination of claim 8 including a spring operable to pivot the lever to exert braking force in response to a decrease in said fluid pressure, and another piston operatively connected to said lever and normally responsive to application of said fluid pressure to overcome the spring to prevent said pivoting of said lever.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |