Patent US4252313A successfully refreshed from Google Patents.
US4252313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Playground equipment
Assignee: Recreation Tech Inc
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Filing: 1979-04-18
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Granted: 1981-02-24
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Expires: 1999-04-18
Abstract
Abstract A type of playground device has vertical or horizontal support members with pipes perpendicular to such wooden support members extending between and mounted on the support members. Each pipe has a sharpened circular edge on each end which extends into a relatively large diameter inner pipe receiving portion of a transverse opening in one of the wooden support members; the sharp edge engages the bottom of the opening with the other side of the wooden support member having a relatively large outer bolt head receiving opening communicating with the inner pipe receiving opening through a central relatively small diameter opening portion. A bolt extends through the opening portions, which are axially aligned, into a threaded plug near the end of the pipe and pulls the sharp end edge of the pipe into the wood of the wooden support member upon tightening of the bolt to provide a construction that is both strong and vandal proof and protrusion free.
Inventors
- 👤 Gerald P. Skalka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:08
CPC Classifications
A; A63; A63B; A63B9/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
208 words
A vertically extending structure comprising first and second spaced wooden support members, an elongated member extending between and supported by said first and second wooden support members, said elongated member having at least one end configured to penetrate its wooden support member, each of said wooden support members in axial alignment with said elongated member, said transverse openings each including an inwardly facing portion of a size and shape to matingly receive and to envelop in a supporting fashion one end of said elongated member, a central bolt body receiving portion having a transverse dimension less than that of said inwardly facing portion, and an outer bolt head receiving portion having a greater transverse diameter than said central bolt body receiving portion and bolt means extending through said transverse opening having a threaded end threadably engaged with internal thread means in the end of said elongated member so that tightening of said bolt means pulls said one end of said elongated member into the wood to penetrate the wood of said wooden support member at the innermost extend of said inwardly facing portion of said transverse opening to tend to prevent the removal of said elongated member from said inwardly facing portions if said bolt means is removed.
Claim 2
Dependent Claim
208 words
A vertically extending structure comprising first and second spaced wooden support members, an elongated member extending between and supported by said first and second wooden support members, said elongated member having at least one end configured to penetrate its wooden support member, each of said wooden support members in axial alignment with said elongated member, said transverse openings each including an inwardly facing portion of a size and shape to matingly receive and to envelop in a supporting fashion one end of said elongated member, a central bolt body receiving portion having a transverse dimension less than that of said inwardly facing portion, and an outer bolt head receiving portion having a greater transverse diameter than said central bolt body receiving portion and bolt means extending through said transverse opening having a threaded end threadably engaged with internal thread means in the end of said elongated member so that tightening of said bolt means pulls said one end of said elongated member into the wood to penetrate the wood of said wooden support member at the innermost extend of said inwardly facing portion of said transverse opening to tend to prevent the removal of said elongated member from said inwardly facing portions if said bolt means is removed.
Claim 3
Dependent Claim
13 words
The invention of claim 1 wherein said elongated member is a metal pipe.
Claim 4
Dependent Claim
41 words
The invention of claim 1 wherein said elongated member is a metal pipe and wherein said bolt head receiving portion is of sufficient depth to fully enclose the head of said bolt within the peripheral confines of said wooden support member.
Claim 5
Dependent Claim
33 words
The invention of claim 1 wherein said bolt head receiving portion is of sufficient depth to fully enclose the bolt head of said bolt within the peripheral confines of said wooden support member.
Claim 6
Dependent Claim
25 words
The invention of claim 1 wherein said elongated member is a metal pipe extending in a horizontal manner and having a friction enhancing outer coating.
Claim 7
Dependent Claim
35 words
The invention of claim 1 wherein said elongated member is a hollow metal pipe and said internal thread means is provided in plug members spaced inwardly in said pipe from the said one end thereof.
Claim 8
Dependent Claim
13 words
The invention of claim 6 wherein said metal pipe is of cylindrical configuration.
Claim 9
Dependent Claim
29 words
The invention of claim 1 wherein a plurality of said elongated members are mounted between said wooden support members with each of said elongated members comprising a metal tube.
Claim 10
Dependent Claim
20 words
The invention of claim 8 wherein said wooden support members comprise vertical posts and said metal tubes are horizontally oriented.
Claim 11
Dependent Claim
211 words
A vertically extending structure comprising first and second spaced wooden support members, an elongated metal tube extending between and supported by said first and second wooden support members, said elongated metal member having at least one end of a configuration to penetrate its wooden support member, each of said wooden support members including a transverse opening extending through the wooden support members in axial alignment with said elongated member, said transverse openings each including an inwardly facing portion of a size and shape to matingly receive and to envelop in a supporting fashion one end of said elongated member and a central bolt body receiving portion adjacent said inwardly facing portion having a transverse dimension less than that of said inwardly facing portion, and bolt means extending through said transverse opening having a threaded end threadably engaged with internal thread means in the end of said elongated metal tube member so that tightening of said bolt means pulls said one end of said elongated member into the wood to penetrate the wood of said wooden support member at the innermost extent of said inwardly facing portion of said transverse opening to tend to prevent the removal of said elongated member from said inwardly facing portions if said bolt means is removed.
Claim 12
Dependent Claim
211 words
A vertically extending structure comprising first and second spaced wooden support members, an elongated metal tube extending between and supported by said first and second wooden support members, said elongated metal member having at least one end of a configuration to penetrate its wooden support member, each of said wooden support members including a transverse opening extending through the wooden support members in axial alignment with said elongated member, said transverse openings each including an inwardly facing portion of a size and shape to matingly receive and to envelop in a supporting fashion one end of said elongated member and a central bolt body receiving portion adjacent said inwardly facing portion having a transverse dimension less than that of said inwardly facing portion, and bolt means extending through said transverse opening having a threaded end threadably engaged with internal thread means in the end of said elongated metal tube member so that tightening of said bolt means pulls said one end of said elongated member into the wood to penetrate the wood of said wooden support member at the innermost extent of said inwardly facing portion of said transverse opening to tend to prevent the removal of said elongated member from said inwardly facing portions if said bolt means is removed.
Claim 13
Dependent Claim
45 words
The invention of claim 10 wherein said elongated metal tube is of a cylindrical configuration and a thickness selected to deform its said one end to prevent turning of the elongated metal tube in its wooden support member upon the tightening of said bolt means.
References Cited (Backward Citations)
CH73548A
Cited
DE327136C
Cited
US2206581A
Cited
US2462321A
Cited
US3524644A
Cited
US3814416A
Cited
US3893776A
Cited
US3969871A
Cited
US4124317A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |