US3935627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making sheet metal pulley
Assignee: Arrowhead Engineering Corp
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Filing: 1974-07-19
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Granted: 1976-02-03
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Expires: 1994-07-19
Abstract
Abstract A method for forming the grooves in single and multigroove sheet metal pulleys, including shaping and/or crimping of the groove walls, wherein the grooves are formed by a sequential, single step, continuous process from a punched or drawn blank without intermediate handling and/or displacement of the blank using both axial and radial pressures, wherein the applied radial pressures or forces are substantially less than the applied axial pressures or forces. The pulley may have grooves of the same or different pitch and of the same or different diameter.
Inventors
- 👤 Fred A. Wolbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:33
CPC Classifications
B; B21; B21D; B21D26/00; B21D26/02; B21D26/021; B21D15/00; B21D15/04; B21D15/10; B21D26/031; B21D53/00; B21D53/26; B21D53/261; F; F16; F16H; F16H55/00; F16H55/32; F16H55/36; F16H55/44; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49453; Y10T29/4946
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
193 words
A process for making a sheet metal pulley having plural grooves therein in a continuous single work cycle from a hollow generally cup-shaped sheet metal blank having an inner hub portion, an outer axially extending flange portion and at least one axially extending wall portion and at least one angular, transversely extending wall portion therebetween comprising the steps of: a. supporting said blank in a metal deforming apparatus; b. introducing a forming fluid into the interior of said blank to exert pressure against said wall portions; c. exerting an axial force on said blank at said hub portion by actuating a ram member disposed thereat to outwardly deform said wall portions by the coaction of said axial force and said forming fluid; d. confining and shaping said outwardly deformed wall portions between plural movable forming die members disposed exteriorly of said blank and cooperatively actuating said ram member and said plural forming die members to partially form grooves; e. adjusting the pressure and volume of said forming fluid while simultaneously crimping at least one lateral wall of said grooves to complete the formation thereof; and f. withdrawing said plural movable forming die member.
Claim 2
Dependent Claim
193 words
A process for making a sheet metal pulley having plural grooves therein in a continuous single work cycle from a hollow generally cup-shaped sheet metal blank having an inner hub portion, an outer axially extending flange portion and at least one axially extending wall portion and at least one angular, transversely extending wall portion therebetween comprising the steps of: a. supporting said blank in a metal deforming apparatus; b. introducing a forming fluid into the interior of said blank to exert pressure against said wall portions; c. exerting an axial force on said blank at said hub portion by actuating a ram member disposed thereat to outwardly deform said wall portions by the coaction of said axial force and said forming fluid; d. confining and shaping said outwardly deformed wall portions between plural movable forming die members disposed exteriorly of said blank and cooperatively actuating said ram member and said plural forming die members to partially form grooves; e. adjusting the pressure and volume of said forming fluid while simultaneously crimping at least one lateral wall of said grooves to complete the formation thereof; and f. withdrawing said plural movable forming die member.
Claim 3
Dependent Claim
46 words
The process as defined by claim 1, wherein said blank is supported in said metal deforming apparatus by causing said flange portion to be held between the upper shaped end of a stationary die member and one edge of a shaped first movable forming die member.
Claim 4
Dependent Claim
43 words
The process as defined in claim 1, wherein said forming fluid is introduced into the interior of said blank through conduits disposed within a movable forming die member in sealing engagement with the interior of said blank about which said blank is deformed.
Claim 5
Dependent Claim
17 words
The process as defined by claim 1, wherein said pulley has two grooves of different pitch diameters.
Claim 6
Dependent Claim
16 words
The process as defined by claim 1, wherein said pulley has two grooves of different widths.
Claim 7
Dependent Claim
19 words
The process as defined by claim 1, wherein said pulley has two grooves of the same diameter and configuration.
Claim 8
Dependent Claim
47 words
The process as defined by claim 1, wherein said blank is comprised of plural axially extending wall portions and angular, transversely extending wall portions and wherein each of said grooves is located and determined as to size by bulging said axially extending wall portions in the blank.
Claim 9
Dependent Claim
47 words
The process as defined in claim 1, wherein the pressure of said forming fluid is greater during the deformation of said at least one axially extending wall portion and the formation of an uncrimped groove wall therein than during the formation of a crimped grooved wall therein.
Claim 10
Dependent Claim
37 words
The process as defined by claim 1, wherein said grooves are formed sequentially in a continuous single work cycle with the first of said grooves being formed at the end nearest said hub portion of said blank.
Claim 11
Dependent Claim
20 words
The process as defined by claim 1, wherein said grooves are formed substantially simultaneously in a continuous single work cycle.
Claim 12
Dependent Claim
18 words
The process as defined by claim 1, wherein the pressure and volume of said forming fluid is decreased.
Claim 13
Dependent Claim
97 words
The process as defined by claim 1, wherein said pulley is a multi-groove pulley and said grooves are formed sequentially and during the formation of said grooves the pressure and volume of the forming fluid within said blank at the point of deformation is reduced following outward deformation during the crimping of said at least one lateral wall while the pressure exerted by said forming fluid along the remainder of the wall portions of said blank is maintained sufficiently high to promote outward deformation of said wall portions as said axial force is exerted upon said blank.
Claim 14
Dependent Claim
14 words
The process as defined by claim 1, wherein said forming fluid is a liquid.
Claim 15
Dependent Claim
23 words
The process as defined by claim 1, wherein residual air within said blank is evacuated prior to the exertion of said axial force.
Claim 16
Dependent Claim
37 words
The process as defined by claim 1, wherien said pulley is multi-groove and at least one lateral wall of said grooves is crimped thereby providing a pulley having a surface area less than that of said blank.
Claim 17
Dependent Claim
24 words
The process as defined by claim 1, wherein an adjacent pair of said plural movable forming die members are biased away from each other.
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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) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |