US3897291A — Method and assembly for making a power transmissi…

Claim 1

Independent Claim 250 words

The method of making a power transmission belt having transversely extending driving teeth on opposite surfaces thereof and an essentially inextensible tensile member embedded therein, said method comprising: A. forming separate first and second belt portions of flexible polymeric material by means of pressure in the absence of any appreciable degree of curing or vulcanization with each portion after forming having a plurality of driving teeth on one surface thereof, said teeth extending transversely of the portions; B. positioning said first portion around a grooved generally cylindrical mandrel to form an endless generally cylindrical belt sleeve with the teEth of said first portion facing outwardly of the mandrel; C. applying a tensile member over substantially the entire outer periphery of the opposite surface of said first portion; D. positioning said second portion over said tensile member to form an endless generally cylindrical belt sleeve with the opposite surface of said second portion in contact with said tensile member and with the teeth of said second portion facing outwardly of the mandrel; E. maintaining said first and second portions in a generally cylindrical disposition while aligning the teeth of said second portion in a predetermined position relative to the teeth of said first portion and retaining the configuration of the teeth of said second portion relative to the teeth of said first portion; and F. curing the previously formed first and second portions into a molded integral belt structure having teeth on opposite surfaces thereof and said tensile member embedded therein.

Claim 2

Independent Claim 250 words

The method of making a power transmission belt having transversely extending driving teeth on opposite surfaces thereof and an essentially inextensible tensile member embedded therein, said method comprising: A. forming separate first and second belt portions of flexible polymeric material by means of pressure in the absence of any appreciable degree of curing or vulcanization with each portion after forming having a plurality of driving teeth on one surface thereof, said teeth extending transversely of the portions; B. positioning said first portion around a grooved generally cylindrical mandrel to form an endless generally cylindrical belt sleeve with the teEth of said first portion facing outwardly of the mandrel; C. applying a tensile member over substantially the entire outer periphery of the opposite surface of said first portion; D. positioning said second portion over said tensile member to form an endless generally cylindrical belt sleeve with the opposite surface of said second portion in contact with said tensile member and with the teeth of said second portion facing outwardly of the mandrel; E. maintaining said first and second portions in a generally cylindrical disposition while aligning the teeth of said second portion in a predetermined position relative to the teeth of said first portion and retaining the configuration of the teeth of said second portion relative to the teeth of said first portion; and F. curing the previously formed first and second portions into a molded integral belt structure having teeth on opposite surfaces thereof and said tensile member embedded therein.

Claim 3

Dependent Claim 29 words

The method as claimed in claim 1 wherein the method further comprises applying a facing of wear-resistant material to cover the teeth of at least one of said portions.

Claim 4

Dependent Claim 22 words

The method as claimed in claim 1 wherein the method further comprises adhering said tensile member to said first and second portions.

Claim 5

Dependent Claim 17 words

The method as claimed in claim 1 wherein said retaining step takes place during said curing step.

Claim 6

Dependent Claim 40 words

The method as claimed in claim 1 wherein said endless belt sleeves have a width less than the axial length of the mandrel so that the outer peripheral surface of said mandrel is exposed adjacent the first and second portions.

Claim 7

Dependent Claim 186 words

The method as claimed in claim 5 wherein said aligning step comprises applying a flexible grooved generally cylindrical matrix over said second portion, said matrix having a plurality of teeth provided in one surface thereof, said teeth disposed in outer rows at each axial end thereof with the teeth of each row extending axially of the matrix and facing inwardly of the mandrel, and a plurality of lands and grooves on its inwardly facing surface extending axially between said rows of teeth, said teeth having an opposite configuration to the grooves of the mandrel and said grooves having an opposite configuration to that of the teeth of said second portion, said matrix having a greater axial length than the first and second portions and the teeth of said matrix protrude radially inwardly beyond the surface of said lands so that when said matrix is applied over said second portion the teeth of said matrix face inwardly of the mandrel and mesh with the grooves of the mandrel in the exposed surface thereof and the grooves of said matrix mesh with the teeth of said second portion.

Claim 8

Dependent Claim 197 words

The method as claimed in claim 6 wherein said matrix includes at least one inner row of teeth disposed intermediately of said outer rows with the teeth of said inner row extending axially of the matrix and protruding radially inwardly beyond the surface of said lands inwardly of said mandrel and the method comprises: A. providing said first and second belt portions with each said portion comprised of a plurality of separate belt sections; B. positioning the belt sections of said first portion around said mandrel with a space therebetween; C. positioning each separate belt section of said second portion over each separate belt section of said first portion so that each overlying section of said second portion is aligned with each underlying section of said first portion and each of the aligned sections are of substantially equal widths so that the outer peripheral surface of the mandrel between each aligned section is exposed; and D. applying said matrix over said mandrel and said aligned sections so that the teeth of the inner row of said matrix overlying the surface of the mandrel disposed between each aligned section registers with the grooves of the exposed mandrel therebetween.

Claim 9

Dependent Claim 70 words

The method as claimed in claim 6 wherein the method further comprises slitting said matrix in a direction parallel to the grooves of the matrix to form a plurality of separate matrix segments and disposing each said matrix segment around said mandrel and said second portion with each said segment disposed in a side-by-side relationship so that substantially the entire outer peripheral surface of said second section is covered thereby.

Claim 10

Dependent Claim 30 words

The method as claimed in claim 6 wherein after the curing step said method comprises removing said matrix and cutting said belt structure into toothed belts of the desired dimensions.

Claim 11

Dependent Claim 34 words

The method as claimed in claim 7 wherein each said belt portion is comprised of two belt sections and the method comprises positioning each said belt section one at a time over the mandrel.

Claim 12

Dependent Claim 116 words

IN A METHOD OF MANUFACTURING A TOOTHED POWER TRANSMISSION BELT INCLUDING THE STEPS OF FORMING A FIRST TOOTHED BELT PORTION BY MEANS OF PRESSURE IN THE ABSENCE OF ANY APPRECIABLE DEGREE OF CURING OR VULCANIZATION WITH SAID FIRST BELT PORTION HAVING A FABRIC FACING, APPLYING SAID FIRST BELT PORTION TO A GENERALLY CYLINDRICALLY SHAPED MANDREL PROVIDED WITH GROOVES EXTENDING AXIALLY THEREOF, THE TEETH OF SAID FIRST TOOTHED BELT PORTION LYING IN THE GROOVES OF SAID MANDREL, SPLICING THE ENDS OF SAID FIRST TOOTHED BELT PORTION TO FORM AN ENDLESS BAND, MANTAINING SAID FIRST AND SECOND PORTIONS IN A GENERALLY CYLINDRICAL DISPOSITION WHILE ALIGNING THE TEETH OF SAID SECOND PORTION IN A PREDETERMINED POSITION RELATIVE TO THE

Claim 13

Dependent Claim 116 words

IN A METHOD OF MANUFACTURING A TOOTHED POWER TRANSMISSION BELT INCLUDING THE STEPS OF FORMING A FIRST TOOTHED BELT PORTION BY MEANS OF PRESSURE IN THE ABSENCE OF ANY APPRECIABLE DEGREE OF CURING OR VULCANIZATION WITH SAID FIRST BELT PORTION HAVING A FABRIC FACING, APPLYING SAID FIRST BELT PORTION TO A GENERALLY CYLINDRICALLY SHAPED MANDREL PROVIDED WITH GROOVES EXTENDING AXIALLY THEREOF, THE TEETH OF SAID FIRST TOOTHED BELT PORTION LYING IN THE GROOVES OF SAID MANDREL, SPLICING THE ENDS OF SAID FIRST TOOTHED BELT PORTION TO FORM AN ENDLESS BAND, MANTAINING SAID FIRST AND SECOND PORTIONS IN A GENERALLY CYLINDRICAL DISPOSITION WHILE ALIGNING THE TEETH OF SAID SECOND PORTION IN A PREDETERMINED POSITION RELATIVE TO THE

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-07-28	1979-01-27	1979-07-29	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-07-28	1983-01-27	1983-07-29	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-07-28	1987-01-27	1987-07-29	$7700.00	Window Closed / Lapsed

Method and assembly for making a power transmission belt and belt made thereby

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