US3638560A — Apparatus for bonding brake blocks

Claim 1

Independent Claim 122 words

A pressure band and spreader assembly for use in heat bonding brake blocks for large vehicle brakes utilizing brake blocks having a nonuniform thickness under pressures ranging from 200 to 300 pounds per square inch which comprises: a. a pressure band to encircle a pair of brakeshoes arranged circularly and loaded with brake blocks having a nonuniform radial dimension to be welded thereto, b. a portable spreader assembly to exert linear pressure diametrically against said brakeshoes to hold said shoes and said blocks against the inner walls of said band, and c. means carried by said assembly for transmitting localized pressure at the ends of said shoes transversely across the width of the pressure band to eliminate uneven stretching of said band.

Claim 2

Dependent Claim 122 words

A pressure band and spreader assembly for use in heat bonding brake blocks for large vehicle brakes utilizing brake blocks having a nonuniform thickness under pressures ranging from 200 to 300 pounds per square inch which comprises: a. a pressure band to encircle a pair of brakeshoes arranged circularly and loaded with brake blocks having a nonuniform radial dimension to be welded thereto, b. a portable spreader assembly to exert linear pressure diametrically against said brakeshoes to hold said shoes and said blocks against the inner walls of said band, and c. means carried by said assembly for transmitting localized pressure at the ends of said shoes transversely across the width of the pressure band to eliminate uneven stretching of said band.

Claim 3

Dependent Claim 41 words

A pressure band and spreader assembly as defined in claim 1 in which said means comprises a reinforcing plate means secured to said band to reinforce the band at its circumference which spans the space between the ends of said shoes.

Claim 4

Dependent Claim 46 words

A pressure band and spreader assembly as defined in claim 1 in which said means comprises a thickened portion derived from an overlap of the ends of said band to reinforce the band at its circumference which spans the space between the ends of said shoes.

Claim 5

Dependent Claim 40 words

A pressure band and spreader assembly as defined in claim 1 in which said means comprises a load bearing surface extending transversely of said band and positioned against circumferential displacement by engagement between said band and portion of a brakeshoe.

Claim 6

Dependent Claim 55 words

A pressure band and spreader assembly as defined in claim 1 in which said portable spreader mechanism comprises a pair of spaced pressure plates having arcuate surfaces to lie against laterally spaced portions of a brakeshoe on the outsides of struts on said shoes, and means to position said plates in said transverse spaced relation.

Claim 7

Dependent Claim 56 words

A pressure band and spreader assembly as defined in claim 5 in which spring leaf means is located to exert a radially outward force on said pressure plates, and means is provided to load said springs to provide a take up as compensation for band expansion under heat to maintain binding pressure on said brake blocks.

Claim 8

Dependent Claim 79 words

A pressure band and spreader assembly as defined in claim 5 in which the means to position said pressure plates comprises spacer plates extending between and secured to said pressure plates having transverse parallel edges extending away from the arcuate surfaces, leaf spring means spanning and overlying said edges, and means to exert radially outward pressure on said leaf spring means between said spacer plates to exert a high pressure radially on said spacer plates against the confined brakeshoes.

Claim 9

Dependent Claim 37 words

A pressure band and spreader assembly as defined in claim 5 in which means is provided at the edges of said spacer plates to loosely confine said leaf springs against displacement when said portable assembly is disassembled.

Claim 10

Dependent Claim 143 words

A pressure band and spreader assembly for use in heat bonding brake blocks for large vehicle brakes utilizing tapering brake blocks under pressures ranging from 200 to 300 pounds per square inch and having brakeshoe struts extending beyond brake block Supporting tables which comprises: a. a pressure band for encircling opposed brakeshoe tables in diametrically opposed relation having opposed portions to contact brake blocks to be bonded and opposed intermediate portions to bridge between said brake blocks, and b. reinforcing plate means laminated with said intermediate portions to extend between opposed brakeshoe tables and dimensioned to extend between the end of said brakeshoe struts wherein to strengthen said pressure band as it bridges the opposed brakeshoes and transmit tension throughout its width and the width of said band to insure consistent pressure on said brake blocks against the brakeshoe tables longitudinally and laterally.

Claim 11

Dependent Claim 143 words

A pressure band and spreader assembly for use in heat bonding brake blocks for large vehicle brakes utilizing tapering brake blocks under pressures ranging from 200 to 300 pounds per square inch and having brakeshoe struts extending beyond brake block Supporting tables which comprises: a. a pressure band for encircling opposed brakeshoe tables in diametrically opposed relation having opposed portions to contact brake blocks to be bonded and opposed intermediate portions to bridge between said brake blocks, and b. reinforcing plate means laminated with said intermediate portions to extend between opposed brakeshoe tables and dimensioned to extend between the end of said brakeshoe struts wherein to strengthen said pressure band as it bridges the opposed brakeshoes and transmit tension throughout its width and the width of said band to insure consistent pressure on said brake blocks against the brakeshoe tables longitudinally and laterally.

Claim 12

Dependent Claim 37 words

A pressure band and spreader assembly as defined in claim 9 in which said intermediate portions of said band and said reinforcing plate means are perforated to provide clearance for the ends of spaced struts on brakeshoes.

Claim 13

Dependent Claim 50 words

A pressure band and assembly as defined in claim 9 in which laterally extending pressure blocks underlie said intermediate band portions and the respective ends of said reinforcing plate means at the end of said brakeshoes to distribute expansion pressure laterally and evenly across said bands and said plate means.

Claim 14

Dependent Claim 35 words

A device as defined in claim 11 in which means on said pressure blocks and means on struts of encircled brakeshoes interengage to position and retain said blocks under the pressure exerted by said band.

Claim 15

Dependent Claim 68 words

A device as defined in claim 12 in which brakeshoes within said band have pressure ends in the form of spaced struts extending along the shoe, said pressure ends having flat angled edges on the outside thereof, said pressure block having slots terminating in flat surfaces to interengage with said edges, and means transfixing said blocks and said struts to lock said blocks in place in said interengagement.

Claim 16

Dependent Claim 183 words

In a pressure band and spreader assembly for use in heat bonding brake blocks for large vehicle brakes having a nonuniform thickness under pressures ranging from 200 to 300 pounds per square inch, a portable spreader element for use in said assembly comprising: a. a pair of parallel pressure plates each having an arcuate edge to fit and bear against the inside surface of a brakeshoe table outside the struts on said table, b. a pair of spacer plates secured to and extending between said pressure plates to space said pressure plates in parallel relation, said spacer plates each having an outer edge to face said table slotted to provide clearance for brakeshoe struts, and having an inner edge facing away from said arcuate edges to serve as a load-bearing edge, c. leaf-spring means spanning and overlying said load-bearing edges, d. means for loosely confining said leaf-spring means against said load-bearing edges, and e. means secured to said leaf-spring means extending generally diametrically of said arcuate edges to cooperate with another spreader element to maintain a selected relative position within a pressure band.

Claim 17

Dependent Claim 183 words

In a pressure band and spreader assembly for use in heat bonding brake blocks for large vehicle brakes having a nonuniform thickness under pressures ranging from 200 to 300 pounds per square inch, a portable spreader element for use in said assembly comprising: a. a pair of parallel pressure plates each having an arcuate edge to fit and bear against the inside surface of a brakeshoe table outside the struts on said table, b. a pair of spacer plates secured to and extending between said pressure plates to space said pressure plates in parallel relation, said spacer plates each having an outer edge to face said table slotted to provide clearance for brakeshoe struts, and having an inner edge facing away from said arcuate edges to serve as a load-bearing edge, c. leaf-spring means spanning and overlying said load-bearing edges, d. means for loosely confining said leaf-spring means against said load-bearing edges, and e. means secured to said leaf-spring means extending generally diametrically of said arcuate edges to cooperate with another spreader element to maintain a selected relative position within a pressure band.

Claim 18

Dependent Claim 61 words

In combination with opposed pairs of portable spreader elements as defined in claim 14, a pair of spaced upright expander units to bear against said leaf-spring means for exerting separating pressure to apply band pressure on brakeshoes, said expander units being slotted laterally from one side to permit said diametrically extending means to slide into position for application of separating force.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1975-01-31	1975-08-02	1976-02-01	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1979-01-31	1979-08-02	1980-02-01	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1983-01-31	1983-08-02	1984-02-01	$7700.00	Window Closed / Lapsed

Apparatus for bonding brake blocks

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