US3621948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic friction braking system
Assignee: LIFECYCLE Inc
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Filing: 1969-06-20
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Granted: 1971-11-23
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Expires: 1989-06-20
Abstract
Abstract An automatic friction braking system including a brake wheel with an encircling brake band. The brake band is coupled to a pulley biased in a direction opposite the differential tension in the brake band by a spiral spring. A motor operated cam adjusts the tension in the brake band. A potentiometer is coaxially mounted with the pulley to indicate the degree of rotation of the pulley and thus torque load on the brake wheel and is coupled through a closed loop servosystem to the loading motor. A dual potentiometer is also provided for indicating the power dissipation of the brake wheel.
Inventors
- 👤 Keene P Dimick
- 👤 Anthony J Iozzi
- 👤 Earl L Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:09
CPC Classifications
A; A63; A63B; A63B24/00; A61; A61B; A61B5/00; A61B5/22; A61B5/221; A63B21/00; A63B21/012; A63B21/015; A63B22/00; A63B22/06; A63B22/0605; A63B2220/00; A63B2220/17
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
195 words
An automatic friction braking system having a rotatable brake wheel, brake band means at least partially encircling said brake wheel and having a differential tension due to rotation of said brake wheel, and means for varying the tension in said brake band means whereby the torque load on said brake wheel is similarly varied said system comprising: means for sensing the differential tension in said brake band means including pulley means coupled to said brake band means, and including curved spring means biasing said pulley means in opposition to said differential tension said spring means being coaxial with said pulley means, the degree of rotation of said pulley means being indicative of said torque load on said brake wheel; first potentiometer means coaxial with said pulley means and responsive to the rotation thereof to produce an output signal proportional to said degree of rotation of said pulley means; means for providing a reference signal; and means for comparing said output signal with said reference signal to produce an error signal, said means for varying said tension being responsive to said error signal to maintain said torque load at a magnitude determined by said reference signal.
Claim 2
Dependent Claim
195 words
An automatic friction braking system having a rotatable brake wheel, brake band means at least partially encircling said brake wheel and having a differential tension due to rotation of said brake wheel, and means for varying the tension in said brake band means whereby the torque load on said brake wheel is similarly varied said system comprising: means for sensing the differential tension in said brake band means including pulley means coupled to said brake band means, and including curved spring means biasing said pulley means in opposition to said differential tension said spring means being coaxial with said pulley means, the degree of rotation of said pulley means being indicative of said torque load on said brake wheel; first potentiometer means coaxial with said pulley means and responsive to the rotation thereof to produce an output signal proportional to said degree of rotation of said pulley means; means for providing a reference signal; and means for comparing said output signal with said reference signal to produce an error signal, said means for varying said tension being responsive to said error signal to maintain said torque load at a magnitude determined by said reference signal.
Claim 3
Dependent Claim
59 words
An automatic friction braking system as in claim 1 together with means for sensing the rotary speed of said brake wheel, second potentiometer means coaxial with said pulley means and responsive to the degree of rotation thereof; and power-indicating means coupled to said speed-sensing means and said second potentiometer means for indicating the power dissipation of said brake wheel.
Claim 4
Dependent Claim
109 words
An automatic friction braking system as in claim 2 where said second potentiometer means includes a resistor with a moving contact having a location on said resistor corresponding to said degree of rotation of said pulley means, and where said speed-sensing means is coupled across said resistor to produce a current through said resistor proportional to said rotary speed said power-indicating means including voltmeter means coupled to said moving contact for sensing the magnitude of voltage at said moving contact said voltage being proportional to the product of said torque load and said rotary speed wherebY the power dissipation of said brake wheel is indicated by said voltmeter means.
Claim 5
Dependent Claim
18 words
An automatic friction braking system as in claim 1 where said curved spring means is a spiral-type spring.
Claim 6
Dependent Claim
67 words
An automatic friction braking system as in claim 1 where said first potentiometer means includes, a disk mounted coaxially with said spring means said disk having a groove in its rim, a helically wound conductor mounted in said groove, and brush means engaging said conductor, said brush means and disk having relative movement between each other as determined by said degree of rotation of said pulley means.
Claim 7
Dependent Claim
28 words
An automatic friction braking system as in claim 5 together with second potentiometer means similar to said first potentiometer means and mounted in another groove in said rim.
Claim 8
Dependent Claim
37 words
An automatic friction braking system as in claim 5 where said conductor is wound on an insulated wire said wire having two ends and being mounted in said groove by fastening means at each of said ends.
Claim 9
Dependent Claim
36 words
An automatic friction braking system as in claim 7 together with second potentiometer means similar to said first potentiometer means and mounted in another groove in said rim said fastening means being common to both potentiometers.
Claim 10
Dependent Claim
15 words
An automatic friction braking system as in claim 8 where said fastening means are screws.
Claim 11
Dependent Claim
31 words
An automatic friction braking system as in claim 1 where said pulley means includes stop means having adjustable eccentric means for limiting rotation of said pulley means in said bias direction.
Claim 12
Dependent Claim
52 words
An automatic friction braking system as in claim 1 where said first potentiometer means includes brush means mounted for rotation with said pulley means, means carrying a resistor engaging said brush means, and means for positioning said resistor relative to said brush means while said pulley means is in a predetermined position.
Claim 13
Dependent Claim
16 words
An automatic friction braking system as in claim 11 where said positioning means includes a setscrew.
References Cited (Backward Citations)
US3049313A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |