Patent US3813197A successfully refreshed from Google Patents.
US3813197A
Expired / Lapsed
US
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Apparatus for making an endless power transmission belt
Assignee: Dayco Products LLC
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Filing: 1972-05-30
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Granted: 1974-05-28
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Expires: 1992-05-30
Abstract
Abstract A molding apparatus and method for making an endless belt construction in an inverted position and having a precisely preloaded load-carrying section are provided. The apparatus employs a mold core defined by a plurality of movable L-shaped segments and means for applying radial forces against the segments in a plurality of spaced parallel planes perpendicular to a central axis therethrough to thereby move the segments radially outwardly and precisely position and hold such segments at a tension-applying location where their outer surfaces define a right circular cylindrical surface and the desired preloading on the load-carrying section.
Inventors
- 👤 R Ray
- 👤 W Champeau
- 👤 Atee K Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:45
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/14; B29C45/14631; B29C45/17; B29C45/40; B29C45/44; B29C45/4421; B29D; B29D29/00; B29D29/10; Y; Y10; Y10S; Y10S425/00; Y10S425/818
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
351 words
An apparatus for making an inverted endless power transmission belt construction having a precisely preloaded loadcarrying section, said apparatus comprising; a mold core having a central axis and a plurality of moveable segments which are moveable radially inwardly and outwardly and have outside surfaces which cooperate to define a precision right circular cylindrical surface, said segments being moveable radially inwardly toward said axis to a retracted position to enable installation of a portion of said belt construction therearound, means for moving and holding said segments radially outwardly from said axis to precisely position said segments to a tensionapplying location wherein their outside surfaces define said right circular cylindrical surface; an outer housing supported in position concentrically around said core and having an inside surface which cooperates with said right circular cylindrical surface to define opposed walls of a mold cavity; said moving and holding means applying radial forces against said segments in a plurality of spaced parallel planes arranged substantially perpendicular to said axis to thereby preload said portion of said belt construction in a uniform and precise manner across its entire width and enable introduction of an elastomeric material into said cavity for precision molding against said portion; a bottom plate having a top planar horizontal surface defining a bottom wall for said mold cavity, each of said segments and said housing being supported on said horizontal surface; each of said segments having a substantially L-shaped cross-sectional configuration defined by a horizontally extending leg portion supported on said horizontal surface and a vertically extending leg portion arranged substantially parallel to said axis; each leg portion of eaCh of said segments having a vertically extending arcuate surface which is concave toward said axis, said moving and holding means having a pair of vertically spaced cylindrical surfaces which engage said arcuate surfaces and hold said segments at said tension-applying location, and at said location said arcuate surfaces on said horizontal leg portions are arranged on a first common circumference and said arcuate surfaces on said vertical leg portions are arranged on a second common circumference which is larger than said first circumference.
Claim 2
Independent Claim
351 words
An apparatus for making an inverted endless power transmission belt construction having a precisely preloaded loadcarrying section, said apparatus comprising; a mold core having a central axis and a plurality of moveable segments which are moveable radially inwardly and outwardly and have outside surfaces which cooperate to define a precision right circular cylindrical surface, said segments being moveable radially inwardly toward said axis to a retracted position to enable installation of a portion of said belt construction therearound, means for moving and holding said segments radially outwardly from said axis to precisely position said segments to a tensionapplying location wherein their outside surfaces define said right circular cylindrical surface; an outer housing supported in position concentrically around said core and having an inside surface which cooperates with said right circular cylindrical surface to define opposed walls of a mold cavity; said moving and holding means applying radial forces against said segments in a plurality of spaced parallel planes arranged substantially perpendicular to said axis to thereby preload said portion of said belt construction in a uniform and precise manner across its entire width and enable introduction of an elastomeric material into said cavity for precision molding against said portion; a bottom plate having a top planar horizontal surface defining a bottom wall for said mold cavity, each of said segments and said housing being supported on said horizontal surface; each of said segments having a substantially L-shaped cross-sectional configuration defined by a horizontally extending leg portion supported on said horizontal surface and a vertically extending leg portion arranged substantially parallel to said axis; each leg portion of eaCh of said segments having a vertically extending arcuate surface which is concave toward said axis, said moving and holding means having a pair of vertically spaced cylindrical surfaces which engage said arcuate surfaces and hold said segments at said tension-applying location, and at said location said arcuate surfaces on said horizontal leg portions are arranged on a first common circumference and said arcuate surfaces on said vertical leg portions are arranged on a second common circumference which is larger than said first circumference.
Claim 3
Independent Claim
328 words
An apparatus for making an inverted endless power transmission belt construction having a precisely preloaded load-carrying section, said apparatus comprising; a mold core having a central axis and a plurality of moveable segments which are moveable radially inwardly and outwardly and have outside surfaces which cooperate to define a precision right circular cylindrical surface, said segments being moveable radially inwardly toward said axis to a retracted position to enable installation of a portion of said belt construction therearound, means for moving and holding said segments radially outwardly from said axis to precisely position said segments to a tension-applying location wherein their outside surfaces define said right circular cylindrical surfaces; an outer housing supported in position concentrically around said core and having an inside surface which cooperates with said right circular cylindrical surface to define opposed walls of a mold cavity; said moving and holding means applying radial forces against said segments in a plurality of spaced parallel planes arranged substantially perpendicular to said axis to thereby preload said portion of said belt construction in a uniform and precise manner across its entire width and enable introduction of an elastomeric material into said cavity for precision molding against said portion; a bottom plate having a top planar horizontal surface defining a bottom wall for said mold cavity, each of said segments and said housing being supported on said horizontal surface; each of said segments having a substantially L-shaped cross-sectional configuration defined by a horizontally extending leg portion supported on said horizontal surface and a vertically extending leg portion arranged substantially parallel to said axis; said moving and holding means comprising a central core member having a lower cam surface for engaging the top edge portions of said horizontally extending leg portions and an upper cam surface for engaging the top edge portions of said vertically extending leg portions, each of said cam surfaces applying radial forces in an associated horizontal plane upon moving said central member toward said plate.
Claim 4
Independent Claim
328 words
An apparatus for making an inverted endless power transmission belt construction having a precisely preloaded load-carrying section, said apparatus comprising; a mold core having a central axis and a plurality of moveable segments which are moveable radially inwardly and outwardly and have outside surfaces which cooperate to define a precision right circular cylindrical surface, said segments being moveable radially inwardly toward said axis to a retracted position to enable installation of a portion of said belt construction therearound, means for moving and holding said segments radially outwardly from said axis to precisely position said segments to a tension-applying location wherein their outside surfaces define said right circular cylindrical surfaces; an outer housing supported in position concentrically around said core and having an inside surface which cooperates with said right circular cylindrical surface to define opposed walls of a mold cavity; said moving and holding means applying radial forces against said segments in a plurality of spaced parallel planes arranged substantially perpendicular to said axis to thereby preload said portion of said belt construction in a uniform and precise manner across its entire width and enable introduction of an elastomeric material into said cavity for precision molding against said portion; a bottom plate having a top planar horizontal surface defining a bottom wall for said mold cavity, each of said segments and said housing being supported on said horizontal surface; each of said segments having a substantially L-shaped cross-sectional configuration defined by a horizontally extending leg portion supported on said horizontal surface and a vertically extending leg portion arranged substantially parallel to said axis; said moving and holding means comprising a central core member having a lower cam surface for engaging the top edge portions of said horizontally extending leg portions and an upper cam surface for engaging the top edge portions of said vertically extending leg portions, each of said cam surfaces applying radial forces in an associated horizontal plane upon moving said central member toward said plate.
Claim 5
Dependent Claim
20 words
An apparatus as set forth in claim 2 in which each of said cam surfaces comprises a substantially frustoconical surface.
Claim 6
Dependent Claim
55 words
An apparatus as set forth in claim 2 and further comprising a top plate arranged against said segments and housing and defining a top wall for said mold cavity which cooperates with said bottom wall and said opposed walls to define a completely enclosed mold cavity enabling introduction of said elastomeric material therewithin under pressure.
Claim 7
Dependent Claim
106 words
An apparatus as set forth in claim 2 in which each of said L-shaped segments has an opening extending through its horizontal leg parallel to its vertical leg, said opening being elongated along a radial line from said axis, and further comprising a plurality of bolts corresponding in number to the said plurality of segments, each bolt being received through the elongated opening of an associated segment and having a threaded end threadedly received in said plate, each bolt holding its segment with its vertical leg parallel to said axis yet allowing sliding movements of its horizontal leg radially inwardly and outwardly on said horizontal surface.
Claim 8
Dependent Claim
43 words
An apparatus as set forth in claim 5 and further comprising a plurality of detachable fastening members fixed to said bottom plate and defIning an integral part thereof, said members having threaded openings therein which threadedly receive said threaded ends of said bolts.
Claim 9
Dependent Claim
75 words
An apparatus as set forth in claim 2 in which said plurality of segments comprise a plurality of six segments arranged in two sets of three with the segments in each set being spaced 120* apart and the segments of one of said sets is moveable radially inwardly a substantial distance to allow radial inward movement of the segments of the other set to enable said installation of said portion of said belt construction therearound.
Claim 10
Dependent Claim
54 words
An apparatus as set forth in claim 7 in which said vertically extending leg portions of said segments have inclined planar surfaces defining opposite sides thereof, said planar surfaces of one segment cooperating with planar surfaces of adjoining segments and the outer edges of said planar surfaces coinciding with said right circular cylindrical surface.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |