US3841447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-actuating brake
Assignee: Ingersoll Equipment Co Inc
•
Filing: 1973-05-16
•
Granted: 1974-10-15
•
Expires: 1993-05-16
Abstract
Abstract A self-actuating brake mechanism including a flexible brake band having a center portion received around the brake drum and having free ends connected to the braking mechanism of this invention. The improved brake mechanism is self-actuating in both directions of rotation of the brake drum. The brake actuating mechanism includes a pair of levers, each having a fixed pivot axis and a pivotal connection to a common link. The free ends of the band are each pivotally connected to one of the levers between the fixed pivot axis and the common link connection. The brake is actuated by pulling or tensioning the common link member. The brake linkage also includes a stop means which permits rotation of the levers only in a direction which tensions the brake band ends. The friction of braking tensions the pivotal connection of the band to one of the levers, which is fixed by the stop means. The opposed lever rotates about its fixed axis, upon actuation of the brake, to tension the opposed end of the brake band in the direction of rotation of the drum, providing a self-actuating braking action. In the preferred embodiment of the brake mechanism, the pivotal lever connections define a triangular relation which provides a mechanical advantage to braking. In the disclosed embodiment, the levers cross with the common link located between the fixed pivot axes of the levers.
Inventors
- 👤 W Schlapmann
- 👤 D Manteufel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:42
CPC Classifications
F; F16; F16D; F16D49/00; F16D49/08; B; B60; B60T; B60T1/00; B60T1/02; B60T1/06; B60T1/062; B60T13/00
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
185 words
A self-actuating band brake for vehicles and the like, comprising: a flexible brake band having a center portion received around a rotatable brake drum and having opposed free ends, a pair of levers, said levers having spaced fixed pivot axes and each lever having a pivotal connection to a brake actuating means, said brake actuating means adapted to tension said pivot connections upon actuation of the brake, said opposed free band ends each pivotally connected to one of said levers, between said fixed pivot axis and said pivotal connection, and a stop means preventing rotation of said levers about said fixed pivot axis in the direction of rotation of the drum which would relieve the tension on said band ends and permitting rotation in the opposite direction, whereby the friction of braking in one direction tensions the pivotal connection of said band to one of said levers which is fixed by said stop means and the opposed lever rotates about its fixed pivot axis upon actuation of said brake to tension the opposed end of said brake band around said drum and brake the vehicle.
Claim 2
Dependent Claim
185 words
A self-actuating band brake for vehicles and the like, comprising: a flexible brake band having a center portion received around a rotatable brake drum and having opposed free ends, a pair of levers, said levers having spaced fixed pivot axes and each lever having a pivotal connection to a brake actuating means, said brake actuating means adapted to tension said pivot connections upon actuation of the brake, said opposed free band ends each pivotally connected to one of said levers, between said fixed pivot axis and said pivotal connection, and a stop means preventing rotation of said levers about said fixed pivot axis in the direction of rotation of the drum which would relieve the tension on said band ends and permitting rotation in the opposite direction, whereby the friction of braking in one direction tensions the pivotal connection of said band to one of said levers which is fixed by said stop means and the opposed lever rotates about its fixed pivot axis upon actuation of said brake to tension the opposed end of said brake band around said drum and brake the vehicle.
Claim 3
Dependent Claim
64 words
The self-actuating band brake defined in claim 1, characterized in that said fixed pivot axes and said pivotal connections of said levers define a triangle with the first leg of said triangle defined between said fixed pivot axis and said pivotal connection to said band, said first leg extending generally toward the axis of said drum when said brake is in the relaxed position.
Claim 4
Dependent Claim
38 words
The self-actuating band brake defined in claim 2, characterized in that the second leg of said triangle, defined between said fixed pivot axes and said pivotal connection to said brake actuating means is longer than said fiRst leg.
Claim 5
Dependent Claim
42 words
The self-actuating band brake defined in claim 2, characterized in that said levers are L-shaped, each lever having a relatively short arm and a longer arm joined at an apex, said free band ends pivotally connected to said levers adjacent said apex.
Claim 6
Dependent Claim
34 words
The self-actuating band brake defined in claim 4, characterized in that said longer arms of said levers cross and are pivotally connected at spaced locations to a common link located between said pivot axes.
Claim 7
Dependent Claim
53 words
The self-actuating band brake defined in claim 5, characterized in that said common link is pivotally connected to said levers at spaced locations and said common link is pivotally connected to said brake actuating means between said spaced locations, whereby said common link automatically adjusts angularly to compensate for the direction of braking.
Claim 8
Dependent Claim
61 words
The self-actuating band brake defined in claim 6, characterized in that said common link is pivotally connected to the longer leg of said levers by a pair of links each of which abut the short leg of the opposed lever and providing said stop means preventing rotation of said levers in a direction which relieves the tension on said band ends.
Claim 9
Dependent Claim
43 words
The self-actuating band brake defined in claim 1, characterized in that said levers are pivotally connected to a common link at spaced locations by a connector link which abuts the opposed link, preventing rotation in said one direction and providing said stop means.
Claim 10
Dependent Claim
36 words
The self-actuating band brake defined in claim 8, characterized in that said levers are L-shaped, each lever having a longer arm pivotally connected to said common link and a shorter arm having said fixed pivot axis.
Claim 11
Dependent Claim
29 words
The self-actuating band brake defined in claim 9, characterized in that said longer arms of said levers cross and said common link is located between said fixed pivot axes.
Claim 12
Dependent Claim
42 words
The self-actuating band brake defined in claim 10, characterized in that said shorter arms of said levers each include an extension beyond said fixed pivot axis which abut said connector links and preventing rotation in said one direction, providing said stop means.
Claim 13
Dependent Claim
269 words
A self-actuating band brake for vehicles and the like, comprising: a flexible band brake having opposed free ends and a center portion wrapped around a rotatable brake drum, a pair of levers, said levers having fixed pivot axes in spaced relation adjacent said free band ends and spaced pivotal connections to a common link, located between said fixed pivot axes, each free end of said band having a pivotal connection to one of said levers, between said pivot axes and said pivotal connections, said fixed pivot axes and pivotal connections of each of said levers defining a triangle with the first leg of said triangle defined between said fixed pivot axis and said pivotal connection to said band end extending generally toward the axis of said drum when the brake is in the relaxed position and the second leg of said triangle defined between said pivotal connections being greater in length than said first leg, and a stop means adapted to prevent rotation of said levers about said fixed pivot axes toward said drum and permitting rotation away from said drum which tensions said band, and a brake linkage means adapted to tension said common link upon actuation of said brake, whereby the actuation of said brake tensions said common link and said pivotal connections of said levers to cause said band to frictionally engage said drum, the frictional braking of said band in one direction tensioning one pivotal connection to one lever, which is fixed by said stop means and the opposed lever rotating to tension the opposed end of said brake band, providing a self-actuating braking mechanism.
Claim 14
Dependent Claim
269 words
A self-actuating band brake for vehicles and the like, comprising: a flexible band brake having opposed free ends and a center portion wrapped around a rotatable brake drum, a pair of levers, said levers having fixed pivot axes in spaced relation adjacent said free band ends and spaced pivotal connections to a common link, located between said fixed pivot axes, each free end of said band having a pivotal connection to one of said levers, between said pivot axes and said pivotal connections, said fixed pivot axes and pivotal connections of each of said levers defining a triangle with the first leg of said triangle defined between said fixed pivot axis and said pivotal connection to said band end extending generally toward the axis of said drum when the brake is in the relaxed position and the second leg of said triangle defined between said pivotal connections being greater in length than said first leg, and a stop means adapted to prevent rotation of said levers about said fixed pivot axes toward said drum and permitting rotation away from said drum which tensions said band, and a brake linkage means adapted to tension said common link upon actuation of said brake, whereby the actuation of said brake tensions said common link and said pivotal connections of said levers to cause said band to frictionally engage said drum, the frictional braking of said band in one direction tensioning one pivotal connection to one lever, which is fixed by said stop means and the opposed lever rotating to tension the opposed end of said brake band, providing a self-actuating braking mechanism.
Claim 15
Dependent Claim
50 words
The self-actuating band brake defined in claim 12, characterized in that the pivotal connections to said common link are spaced and said brake linkage means is pivotally connected to said common link between said pivotal connection, whereby said common link automatically adjusts anGularly to compensate for the direction of braking.
Claim 16
Dependent Claim
43 words
The self-actuating band brake defined in claim 12, characterized in that said levers are L-shaped, each lever having a longer arm between said pivotal connections and a shorter arm between said fixed pivot axis and said pivotal connection to said free band end.
Claim 17
Dependent Claim
29 words
The self-actuating band brake defined in claim 14, characterized in that said longer arms of said levers cross and said common link is located between said fixed pivot axes.
Claim 18
Dependent Claim
50 words
The self-actuating band brake defined in claim 15, characterized in that said longer arms of said levers are joined to said common link by pivotally connected connector links which abut said shorter arms of the opposed link and prevent rotation of said levers toward said drum, providing said stop means.
Claim 19
Dependent Claim
27 words
The self-actuating band brake defined in claim 16, characterized in that said shorter arms include an extension beyond said fixed pivot axes which abut said connector links.
Claim 20
Dependent Claim
38 words
The self-actuating band brake defined in claim 14, characterized in that said arms are joined at an apex and said free ends of the brake band are each pivotally connected to one of said arms adjacent said apex.
Claim 21
Dependent Claim
42 words
The self-actuating band brake defined in claim 18, characterized in that said apex is located adjacent said free ends of said brake band and said shorter arms extend toward the axis of said drum when said brake is in the relaxed position.
Claim 22
Dependent Claim
44 words
The self-actuating band brake defined in claim 19, characterized in that said stop means comprises a pair of connector links each pivotally connecting one of said longer arms of said levers to said common link and abutting the shorter arm of the opposed links.
Claim 23
Dependent Claim
212 words
A self-actuating band brake for vehicles and the like, comprising: a flexible brake band for receipt around a conventional brake drum, a pair of L-shaped levers, each lever having a relatively short arm extending generally toward said drum and the longer arm, said arms joined at an apex adjacent the ends of said brake band, each lever having a fixed pivot axis in said short arm and a pivotal connection to a common link adjacent the end of said longer arm, said brake band having a center portion wrapped around said drum and opposed free ends, each of said free band ends pivotally connected to one of said levers adjacent said apex, a stop means preventing rotation of said levers about said fixed pivot axes towards said band ends, and a brake actuating means adapted to tension said common link away from said brake drum to tension said band around said drum, whereby the frictional braking of said band in one direction tensions the pivotal connection of said band to one of said levers, which is fixed by said stop means, and upon actuation of the brake, the opposed lever is rotated about its fixed pivot axis to tension the opposed end of said band in a self-actuating direction, around said drum.
Claim 24
Dependent Claim
212 words
A self-actuating band brake for vehicles and the like, comprising: a flexible brake band for receipt around a conventional brake drum, a pair of L-shaped levers, each lever having a relatively short arm extending generally toward said drum and the longer arm, said arms joined at an apex adjacent the ends of said brake band, each lever having a fixed pivot axis in said short arm and a pivotal connection to a common link adjacent the end of said longer arm, said brake band having a center portion wrapped around said drum and opposed free ends, each of said free band ends pivotally connected to one of said levers adjacent said apex, a stop means preventing rotation of said levers about said fixed pivot axes towards said band ends, and a brake actuating means adapted to tension said common link away from said brake drum to tension said band around said drum, whereby the frictional braking of said band in one direction tensions the pivotal connection of said band to one of said levers, which is fixed by said stop means, and upon actuation of the brake, the opposed lever is rotated about its fixed pivot axis to tension the opposed end of said band in a self-actuating direction, around said drum.
Claim 25
Dependent Claim
29 words
The self-actuating band brake defined in claim 21, characterized in that said longer arms of said levers cross and said common link is located between said fixed pivot axes.
Claim 26
Dependent Claim
53 words
The self-actuating band brake defined in claim 22, characterized in that said levers are pivotally connected to said common link at spaced locations and said brake actuating means is pivotally connected to said common link between said spaced locations, permitting said common link to adjust angularly to compensate for the direction of braking.
Claim 27
Dependent Claim
45 words
The self-actuating band brake defined in claim 21, characterized in that said stop means comprises a pair of connector links which pivotally connect said levers to said common link and abut the opposed link, said connector links preventing rotation of said levers toward said drum.
Claim 28
Dependent Claim
28 words
The self-actuating band brake defined in claim 24, characterized in that said short lever arms include an extension beyond said fixed pivot axes which abut said connector links.
Claim 29
Dependent Claim
41 words
The self-actuating band brake defined in claim 21, characterized in said brake actuating means includes a brake rod pivotally connected at one end to said common link and said brake rod connected to a brake pedal linkage at the opposed end.
Claim 30
Dependent Claim
59 words
The self-actuating band brake defined in claim 26, characterized in that said brake pedal linkage includes a brake pedal link having a fixed pivot and pivotally connected to said brake rod spaced from said fixed pivot, whereby rotation of said brake pedal link tensions said rod, pulling said common link and tightening said brake band around the brake drum.
References Cited (Backward Citations)
US1464761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |