US3585828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bladder expander and casket product
Assignee: Wallace Expanding Machines Inc
•
Filing: 1968-09-05
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Granted: 1971-06-22
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Expires: 1988-09-05
Abstract
Abstract An expander for forming a drawn metal product such as a casket and the like. The expander includes a bladder which surrounds a ring. Hydraulic fluid is pumped into the bladder to cause the bladder to expand and force the workpiece against a rigid outer die, the hydraulic fluid being conveyed by a conduit which extends through the bladder and ring and is fixed to the ring. The above mentioned caskets have a one-piece single-seam construction for their sidewalls.
Inventors
- 👤 Ralph E Roper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:00
CPC Classifications
B; B21; B21D; B21D22/00; B21D22/10; B21D22/12; B21D22/125; Y; Y10; Y10S; Y10S425/00; Y10S425/014
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
104 words
Expander apparatus comprising a bladder of toroidal configuration having an outer wall and an inner wall integrally joined a ring-shaped band member received within and coaxial with said bladder, a conduit communicating with said bladder through said ring-shaped member, means for supplying hydraulic fluid under pressure through said conduit for expanding said bladder, a set of outer dies positioned outwardly of said bladder, said bladder being expandable to force a workpiece against said outer dies, and support means for said bladder and ring-shaped member, said support means positioning said bladder in fixed relation to said outer dies and preventing inward expansion of said bladder.
Claim 2
Dependent Claim
104 words
Expander apparatus comprising a bladder of toroidal configuration having an outer wall and an inner wall integrally joined a ring-shaped band member received within and coaxial with said bladder, a conduit communicating with said bladder through said ring-shaped member, means for supplying hydraulic fluid under pressure through said conduit for expanding said bladder, a set of outer dies positioned outwardly of said bladder, said bladder being expandable to force a workpiece against said outer dies, and support means for said bladder and ring-shaped member, said support means positioning said bladder in fixed relation to said outer dies and preventing inward expansion of said bladder.
Claim 3
Dependent Claim
50 words
The expander apparatus of claim 1 additionally comprising a collar receiving said conduit and opening in said bladder, an annular member embedded in said bladder and surrounding said collar outwardly of the area at which said conduit communicates through said ring-shaped member, said collar being secured to said ring-shaped member.
Claim 4
Dependent Claim
40 words
The expander apparatus of claim 2 wherein said bladder is adhered to said ring-shaped member adjacent said conduit on said first side of said ring-shaped member and wherein said bladder is otherwise separated from said ring-shaped member by petroleum jelly.
Claim 5
Dependent Claim
42 words
The expander apparatus of claim 2 additionally comprising epoxy cement securing and positioning aid annular member relative to said ring-shaped member, said epoxy cement forming a part of said bladder, said bladder being otherwise formed of urethane which bonds to said epoxy.
Claim 6
Dependent Claim
26 words
the expander apparatus of claim 1 additionally comprising a pair of boots of expandable flexible material surrounding said bladder at the upper and lower ends thereof.
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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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |