US3765360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced mast construction
Assignee: Individual
•
Filing: 1972-03-31
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Granted: 1973-10-16
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Expires: 1992-03-31
Abstract
Abstract Mast construction for sailboat spars, flagpoles and the like, and a method of making the same. The mast includes an inner wood core generally cruciform in shape, and low density, rigid thermoplastic foam material positioned in the open areas of the core, with the exposed surface of the thermoplastic material being shaped to provide the desired mast contour. A plurality of reinforcing wires are secured around the foam material, and a resinous material is trowelled around the foam material and the cruciform core, with the resinous material when set imbedding the reinforcing wires and providing a smooth outer contour.
Inventors
- 👤 P Monfort
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:51
CPC Classifications
B; B63; B63B; B63B15/00; B63B15/0083
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
118 words
Mast construction for sailboat spars, flagpoles and the like, comprising: a. an inner wood core generally cruciform in shape; b. low density, rigid thermoplastic foam material positioned in the open areas defined by adjacent legs of said cruciform wood core, the exposed surface of said thermoplastic material being shaped to provide the desired mast contour; c. a plurality of reinforcing wires disposed longitudinally on the exterior of said foam material and transversely spaced around the circumference thereof; d. means for interconnecting said reinforcing wires to enhance the resistance of struCtural stress in the mast, and e. resinous material around said foam material and said cruciform core and imbedding said reinforcing wires thereby to provide a smooth outer contour.
Claim 2
Dependent Claim
118 words
Mast construction for sailboat spars, flagpoles and the like, comprising: a. an inner wood core generally cruciform in shape; b. low density, rigid thermoplastic foam material positioned in the open areas defined by adjacent legs of said cruciform wood core, the exposed surface of said thermoplastic material being shaped to provide the desired mast contour; c. a plurality of reinforcing wires disposed longitudinally on the exterior of said foam material and transversely spaced around the circumference thereof; d. means for interconnecting said reinforcing wires to enhance the resistance of struCtural stress in the mast, and e. resinous material around said foam material and said cruciform core and imbedding said reinforcing wires thereby to provide a smooth outer contour.
Claim 3
Dependent Claim
42 words
The mast of claim 1 wherein said rigid thermoplastic foam material is shaped and arranged on said cruciform wood core so as to provide an open area adjacent the center of the cruciform thereby to provide a hollow, relatively light weight mast.
Claim 4
Dependent Claim
19 words
The mast of claim 1 which is tapered in cross sectional thickness from one end thereof to the other.
Claim 5
Dependent Claim
64 words
The mast of claim 1 wherein said means for interconnecting said reinforcing wires comprises fill wires extending circumferentially within and secured to said reinforcing wires, the ends of adjacent fill wires being attached to rigidify said reinforcing wires and enhance the transverse tensile strength in the mast, and terminating rings disposed at each end of said mast around which the reinforcing wires are hooked.
Claim 6
Dependent Claim
42 words
The mast of claim 4 wherein said terminating rings are pre-fabricated and shaped to correspond to the shape of the opposed ends of the mast, with the diameter of said terminating rings being at least twice the diameter of said reinforcing wires.
Claim 7
Dependent Claim
29 words
The mast of claim 4 further including supplemental reinforcement means secured to said reinforcing wires in the areas of said mast more likely to be subjected to greater stresses.
Claim 8
Independent Claim
139 words
The method of making a light weight mast for sailboat spars, flagpoles and the like comprising the steps of: a. providing a wood core cruciform shaped in cross section; b. applying to the exterior of said core a low density, rigid thermoplastic foam material bridging the legs of the cruciform core at the terminal portions thereof; c. shaping the exterior of said foam material to provide the desired exterior contour of said mast; d. positioning reinforcing wires longitudinally along the exterior of said foam material in transversely spaced relation; e. interconnecting the intermediate and end portions of said reinforcing wires, and f. covering the exterior of said foam material and said core with a resinous material of a thickness substantially to imbed said reinforcing wires so as to provide a mast having a smooth contour of the desired shape.
Claim 9
Independent Claim
139 words
The method of making a light weight mast for sailboat spars, flagpoles and the like comprising the steps of: a. providing a wood core cruciform shaped in cross section; b. applying to the exterior of said core a low density, rigid thermoplastic foam material bridging the legs of the cruciform core at the terminal portions thereof; c. shaping the exterior of said foam material to provide the desired exterior contour of said mast; d. positioning reinforcing wires longitudinally along the exterior of said foam material in transversely spaced relation; e. interconnecting the intermediate and end portions of said reinforcing wires, and f. covering the exterior of said foam material and said core with a resinous material of a thickness substantially to imbed said reinforcing wires so as to provide a mast having a smooth contour of the desired shape.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |