US3879240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a unitary camper structure
Assignee: Individual
•
Filing: 1973-08-17
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Granted: 1975-04-22
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Expires: 1993-08-17
Abstract
Abstract A unitary camper body formed of an exterior fiberglassreinforced shell and supporting skeletal metal framework integrally bonded together by an insulating core layer of lowdensity foamed polyurethane. The core layer also permanently secures in position any fixtures included in the camper structure. A second layer of high-density foamed polyurethane overlaid on the surface of the first layer provides an inner protective facing for the camper structure. The camper body is fabricated by placing a preformed fiberglass-reinforced shell over a skeletal metal framework so as to form a mold against which a first layer of low-density polyurethane foam is sprayed from the inside to form an inner core, followed by the spraying against the exposed surface of the core layer of a thin second layer of high-density polyurethane foam which forms the interior facing of the camper structure.
Inventors
- 👤 Raymond W Wall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:33
CPC Classifications
B; B60; B60P; B60P3/00; B60P3/32; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1062
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
112 words
A method for making a unitary camper body which comprises the steps of: a. forming an impact-resistent exterior shell; b. mounting said exterior shell on a preformed skeletal reinforcing framework thereby forming a self-contained female mold; c. spraying a first layer of polymeric foam into said mold and over substantially the entire inner surface thereof, said foam layer curing in situ and adhering to and locking itself together with said shell and framework, respectively; and d. thereafter, before said first layer has fully cured, spraying a second layer of polymeric foam over substantially the entire exposed interior surface of said first layer, thereby providing a protective interior facing for said camper body.
Claim 2
Independent Claim
112 words
A method for making a unitary camper body which comprises the steps of: a. forming an impact-resistent exterior shell; b. mounting said exterior shell on a preformed skeletal reinforcing framework thereby forming a self-contained female mold; c. spraying a first layer of polymeric foam into said mold and over substantially the entire inner surface thereof, said foam layer curing in situ and adhering to and locking itself together with said shell and framework, respectively; and d. thereafter, before said first layer has fully cured, spraying a second layer of polymeric foam over substantially the entire exposed interior surface of said first layer, thereby providing a protective interior facing for said camper body.
Claim 3
Independent Claim
102 words
A METHOD FOR MAKING UNITARY CAMPER BODY WHICH COMPRISES THE STEPS OF: A. FORMING AN IMPACT-RESISTENT EXTERIOR SHELL; B. MOUNTING SAID EXTERIOR SHELL ON A PREFORMED SKELETAL REINFORCING FRAMEWORK THEREBY FORMING A SELF-CONTAINED FEMALE MOLD; C. SPRAYING A FIRST LAYER OF POLYMERIC FOAM INTO SAID MOLD AND OVER SUBSTANTIALLY THE ENTIRE INNER SURFACE THEREOF, SAID FOAM LAYER CURING IN SITU AND ADHERING TO AND LOCKING ITSELF TOGEHTER WITH SAID SHELL AND FRAMEWORD, RESPECTIVELY; AND D. THEREAFTER, BEFORE SAID FIRST LAYER HAS FULLY CURED, SPRAYING A SECOND LAYER OF POLYMERIC FOAM OVER SUBSTANTIALLY THE ENTIRE EXPOSED INTERIOR SURFACE OF SAID FIRST LAYER, THEREBY
Claim 4
Independent Claim
102 words
A METHOD FOR MAKING UNITARY CAMPER BODY WHICH COMPRISES THE STEPS OF: A. FORMING AN IMPACT-RESISTENT EXTERIOR SHELL; B. MOUNTING SAID EXTERIOR SHELL ON A PREFORMED SKELETAL REINFORCING FRAMEWORK THEREBY FORMING A SELF-CONTAINED FEMALE MOLD; C. SPRAYING A FIRST LAYER OF POLYMERIC FOAM INTO SAID MOLD AND OVER SUBSTANTIALLY THE ENTIRE INNER SURFACE THEREOF, SAID FOAM LAYER CURING IN SITU AND ADHERING TO AND LOCKING ITSELF TOGEHTER WITH SAID SHELL AND FRAMEWORD, RESPECTIVELY; AND D. THEREAFTER, BEFORE SAID FIRST LAYER HAS FULLY CURED, SPRAYING A SECOND LAYER OF POLYMERIC FOAM OVER SUBSTANTIALLY THE ENTIRE EXPOSED INTERIOR SURFACE OF SAID FIRST LAYER, THEREBY
Claim 5
Dependent Claim
32 words
The method of claim 1 further characterized in that said first layer is formed of a low-density foamable polyurethane material and said second layer is formed of a high-density foamable polyurethane material.
Claim 6
Dependent Claim
72 words
The method of claim 1 wherein fixtures are laid in with temporary fasteners against the inner sides of said skeletal framework prior to said first spraying step, and thereafter said first foam layer is sprayed around said fixtures and against said shell and framework, respectively, so that said first layer upon curing adhers to and acts as the principal means for permanently securing said fixtures in place within said camper body structure.
Claim 7
Dependent Claim
35 words
The method of claim 1 wherein said first layer, upon curing, is the principal bonding means for permanently securing together said exterior shell and said supporting skeletal framework, respectively, to form an integrated camper body.
Claim 8
Dependent Claim
56 words
The mehod of claim 2 further characterized in that said first layer, upon curing, has a density of from about 0.5 to 10 pounds per cubic foot, and said second layer, upon curing, has a density greater than about 10 pounds per cubic foot and a thickness of from about 1/16 to 1/4 of an inch.
Claim 9
Dependent Claim
36 words
The method of claim 2 wherein said first layer has a density of from about 1.5 to 5.0 pounds per cubic foot and said second layer has a density greater than 15 pounds per cubic foot.
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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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |