US3750488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Handbrake apparatus
Assignee: Westinghouse Air Brake Co
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Filing: 1972-01-17
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Granted: 1973-08-07
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Expires: 1992-01-17
Abstract
Abstract This invention relates to a railway car hand brake apparatus having a spring-biased friction clutch to provide for automatic change from high to low speed drive of a driven member by a drive member upon engagement of the brake shoes with the tread surface of the corresponding wheels in response to the manual rotation of a hand brake wheel. Until the brake shoes engage the tread surface of the wheels, the driven member, which carries thereon a drum upon which a hand brake chain is wound, is driven at fast speed through the friction clutch from the drive member that constitutes a drive shaft and a hand wheel keyed thereto. Slippage of the clutch occurs upon the shoes engaging the tread surface of the wheels, whereupon the drum is driven at a slow speed through a gear train interposed between the driven member to which the drum is keyed and the drive shaft.
Inventors
- 👤 G Mcclure
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:30
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H61/0293; F16H2710/00; F16H2710/24; F16H2710/26; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19251; Y10T74/19256; Y10T74/19274; Y10T74/20; Y10T74/20396; Y10T74/20474; Y10T74/20486; Y10T74/20492; Y10T74/20498
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
197 words
A hand brake apparatus for railway vehicles, the combination comprising: a. a driven shaft having mounted thereon a winding drum upon which a hand brake chain may be wound, b. a manually rotatable drive shaft, wherein the improvement comprises: c. a friction-type clutching means capable of slipping action and providing a direct high-speed driving connection through which said drive shaft drives said driven shaft in the absence of slipping action, said clutching means comprising: i. at least two oppositely-arranged clutch elements, ii. means carrying said at least two oppositely arranged clutch elements and having a one-way driving connection with said drive shaft whereby said at least two clutch elements are rotatable with said drive shaft upon rotation thereof in one direction, and iii. biasing means interposed between said at least two clutch elements for biasing one of said at least two clutch elements into frictional contact with said clutch-element-carrying means and the other of said at least two clutch elements into frictional contact with said driven shaft, and d. a gear train providing an indirect slow-speed driving connection through which said drive shaft drives said driven shaft upon the occurrence of slipping action of said clutching means.
Claim 2
Dependent Claim
197 words
A hand brake apparatus for railway vehicles, the combination comprising: a. a driven shaft having mounted thereon a winding drum upon which a hand brake chain may be wound, b. a manually rotatable drive shaft, wherein the improvement comprises: c. a friction-type clutching means capable of slipping action and providing a direct high-speed driving connection through which said drive shaft drives said driven shaft in the absence of slipping action, said clutching means comprising: i. at least two oppositely-arranged clutch elements, ii. means carrying said at least two oppositely arranged clutch elements and having a one-way driving connection with said drive shaft whereby said at least two clutch elements are rotatable with said drive shaft upon rotation thereof in one direction, and iii. biasing means interposed between said at least two clutch elements for biasing one of said at least two clutch elements into frictional contact with said clutch-element-carrying means and the other of said at least two clutch elements into frictional contact with said driven shaft, and d. a gear train providing an indirect slow-speed driving connection through which said drive shaft drives said driven shaft upon the occurrence of slipping action of said clutching means.
Claim 3
Dependent Claim
37 words
A hand brake apparatus, as recited in claim 1, further characterized in said drive and driven shafts are coaxial and one end of said driven shaft constitutes a bearing for the adjacent end of said drive shaft.
Claim 4
Dependent Claim
150 words
A hand brake apparatus, as recited in claim 1, further characterized in that said gear train comprises: a. a first pinion rotatable with said drive shaft, b. a housing, c. a stub shaft journaled in said housing, d. a first gear mounted on said stub shaft for rotation therewith, one tooth of which always has a line of contact with one tooth of said first pinion, e. a second pinion mounted on said stub shaft for rotation therewith, f. a second gear rotatably mounted on said driven shaft, one tooth of which always has a line of contact with one tooth of said second pinion, and g. a one-way driving connection between said second gear and said driven shaft whereby rotation of said second gear in one direction, upon slipping of said clutching means, effects rotation of said driven shaft in the same direction to wind up said winding drum.
Claim 5
Dependent Claim
104 words
A haNd brake apparatus, as recited in claim 3, further characterized in that said housing comprises three casing sections each of which is provided with a bearing, one end of said drive shaft and said driven shaft being journaled respectively in the bearing in two of said casing sections, and one gear of said gear train having a hub integral therewith journaled in the bearing in the other of said casing sections, said hub constituting a bearing for the other end of said driven shaft, and said other end of said driven shaft constituting a bearing for the other end of said drive shaft.
Claim 6
Dependent Claim
68 words
A hand brake apparatus, as recited in claim 1, further characterized in that each of said clutch elements comprises a cup-shaped cylinder, and said clutch-element-carrying means comprises a sleeve member having a pair of inwardly extending, diametrically arranged arcuate members integral therewith, each of which is provided with at least one bore for receiving two of said oppositely arranged cup-shaped cylinders and the respective biasing means interposed therebetween.
Claim 7
Dependent Claim
86 words
A hand brake apparatus, as recited in claim 1, further characterized in that said clutch-element-carrying means comprises a sleeve member having a pair of inwardly extending diametrically-arranged clevises on each of which is pivotally mounted a pawl, and said drive shaft has mounted thereon for rotation therewith a ratchet wheel for providing a driving connection with said pawls upon rotation of said drive shaft in only one direction whereby said friction-type clutching means is driven by said drive shaft upon rotation thereof in said one direction.
Claim 8
Dependent Claim
115 words
A hand brake apparatus, as recited in claim 6, further characterized in that said driven shaft has rigidly secured to its periphery a ratchet wheel, and one gear of said gear train carries a plurality of pawls pivotally mounted thereon in such arcuately spaced relationship that only certain of said pawls fully engage said ratchet wheel upon rotation of said one gear in only one direction for providing a driving connection between said one gear and said ratchet wheel to effect rotation of said driven shaft subsequent to the occurrence of slipping of said clutch elements, said arcuate spacing being effective to reduce backlash upon cessation of said one gear to drive said ratchet wheel.
Claim 9
Dependent Claim
97 words
A hand brake apparatus, as recited in claim 7, further characterized in that said ratchet wheel is provided with a hub mounted on and secured to said driven shaft and with a counterbore coaxial with said hub for receiving therein said sleeve member, and said one gear is provided with a hub rotatably mounted on the hub of said ratchet wheel and with an undercut coaxial with said hubs for receiving therein in unequal spaced-apart arcuate relation said pivoted pawls to provide a reduction in backlash upon cessation of said one gear to drive said ratchet wheel.
Claim 10
Dependent Claim
161 words
A hand brake apparatus, as recited in claim 1, further characterized in that each of said clutch elements comprises a cup-shaped cylinder, said clutch-element-carrying means comprises a sleeve member having a pair of inwardly extending, diametrically arranged arcuate members integral therewith, each of which is provided with at least one bore for receiving two of said oppositely arranged cup-shaped cylinders together with the respective biasing means interposed therebetween and a pair of inwardly extending, diametrically arranged clevises on each of which is pivotally mounted a pawl, and said drive shaft has mounted thereon for rotation therewith a ratchet wheel for providing a driving connection with said pawls upon rotation of said drive shaft in only one direction whereby said friction-type clutching means is driven by said drive shaft upon rotation thereof in said one direction, and said friction-type clutching means in turn driving said driven shaft until the driving resistance of said driven shaft produces slipping action of said clutching means.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |