Patent US2676188A successfully refreshed from Google Patents.
US3672031A
Expired / Lapsed
US
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Method of manufacturing plastic bowling pin
Assignee: Individual
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Filing: 1970-09-17
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Granted: 1972-06-27
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Expires: 1990-09-17
Abstract
Abstract This specification discloses a bowling pin of plastic that has the appearance of a wooden pin, sounds like a wooden pin, and scores like a wooden pin. These properties are imparted by the structure comprising a hollow main body, a hollow core with a space between the core and the body, a removable and replacable cap plug for the upper end of the core, and a removable and replaceable base plug for the lower end of the core; and method of manufacturing the pin of this construction. The present invention relates to blowling pins, and is concurred primarily with a bowling pin of plastic that has all the properties that are of vital interest to a bowler, of a wooden pin and which properties are imparted to the pin by the structural characteristics thereof.
Inventors
- 👤 Maurice Anthony Negrini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:58
CPC Classifications
A; A63; A63D; A63D9/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49789; Y10T29/49798; Y10T29/49826; Y10T29/49861; Y10T29/49879; Y10T29/49947; Y10T29/49959; Y10T29/49961
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
129 words
In the manufacture of a plastic bowling pin, the method comprising the steps of: a. extruding a plastic into a strip of a required cross section; b. cutting a block of appropriate length from saId strip; c. machining the outer surface of said block to provide a contour approximately that of the finished pin; d. drilling a longitudinal passage in said block to provide bore sections; e. milling said block internally from said passage to provide shoulders and an enlarged cylindrical surface between the shoulders; f. assembling a hollow core in said bore passages by insertion therein leaving a hollow portion therebetween formed by said enlarged surface; g. fixing the assembled relation of the body and core; and h. finally finishing the outer contour of said body and core.
Claim 2
Dependent Claim
129 words
In the manufacture of a plastic bowling pin, the method comprising the steps of: a. extruding a plastic into a strip of a required cross section; b. cutting a block of appropriate length from saId strip; c. machining the outer surface of said block to provide a contour approximately that of the finished pin; d. drilling a longitudinal passage in said block to provide bore sections; e. milling said block internally from said passage to provide shoulders and an enlarged cylindrical surface between the shoulders; f. assembling a hollow core in said bore passages by insertion therein leaving a hollow portion therebetween formed by said enlarged surface; g. fixing the assembled relation of the body and core; and h. finally finishing the outer contour of said body and core.
Claim 3
Dependent Claim
53 words
The method of claim 1 together with making the hollow core by the following steps: i. extruding a plastic into a strip of required cross section; j. drilling an upper bore in said core strip from the upper end, and k. drilling a lower bore into said core strip from the lower end.
Claim 4
Dependent Claim
30 words
The method of claim 2 together with the step of machining the outer surface of the core in the zone of the lower bore to provide a desired contour thereon.
Claim 5
Dependent Claim
22 words
The method of claim 3 in which external ribs are formed on said core by the milling of the outer surface 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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |