US3801102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety dart and method for manufacturing the same
Assignee: Marx L & Co Inc us
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Filing: 1972-01-07
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Granted: 1974-04-02
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Expires: 1992-01-07
Abstract
Abstract A safety dart and method for manufacturing the same. The safety dart includes an elongated shaft having an elongated free end portion terminating in an end surface of the shaft and formed with a transverse opening spaced from the latter end surface. A suction cup is fixed to the shaft at the free end portion of the latter, surrounding this free end portion and having part of the material of the suction cup itself extending through and filling the transverse opening to achieve a strong mechanical connection between the suction cup and the shaft. Preferably the materials used for the suction cup and shaft are such that there will be a surface bond also between the suction cup and the shaft. The shaft is first molded and then the shaft is placed in a suction cup mold with the free end portion of the shaft together with the transverse opening in this free end portion situated in the hollow interior of the suction-cup mold. Then the suction cup itself is molded around this free end portion of the shaft so that the material of the suction cup will flow through and fill the transverse opening of the shaft. The shaft is preferably made of a solid body of high impact styrene and the suction cup is preferably made of resilient yieldable plastic which has a styrene butadiene polymer base.
Inventors
- 👤 R Lohr
- 👤 J Quigley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:01
CPC Classifications
F; F42; F42B; F42B6/00; F42B6/003; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/4987; Y10T29/49872
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
215 words
A safety dart comprising a shaft having an elongated free end portion terminating in an end surface situated at one end of said shaft, said elongated free end portion being formed with an opening passing transversely through said elongated free end portion and spaced from said end surface, a suction cup fixed to said shaft at said free end portion thereof, said suction cup having a cup portion situated beyond said end surface and an elongated rear neck portion surrounding said elongated free end portion of said shaft with said elongated free end portion of said shaft extending into said rear elongated neck portion of said suction cup, and means fixed to said neck portion of said suction cup and extending through said opening for mechanically fixing said suction cup to said shaft, said means filling said transverse opening, and said means being integral with and made of the same material as said suction cup, the material of said suction cup being bonded to the surface of said shaft for providing a connection with the latter in addition to the connection provided by said means, said shaft being made of a solid body of high impact styrene and said suction cup being made of a resilient yieldable plastic which has a styrene butadiene polymer base.
Claim 2
Dependent Claim
215 words
A safety dart comprising a shaft having an elongated free end portion terminating in an end surface situated at one end of said shaft, said elongated free end portion being formed with an opening passing transversely through said elongated free end portion and spaced from said end surface, a suction cup fixed to said shaft at said free end portion thereof, said suction cup having a cup portion situated beyond said end surface and an elongated rear neck portion surrounding said elongated free end portion of said shaft with said elongated free end portion of said shaft extending into said rear elongated neck portion of said suction cup, and means fixed to said neck portion of said suction cup and extending through said opening for mechanically fixing said suction cup to said shaft, said means filling said transverse opening, and said means being integral with and made of the same material as said suction cup, the material of said suction cup being bonded to the surface of said shaft for providing a connection with the latter in addition to the connection provided by said means, said shaft being made of a solid body of high impact styrene and said suction cup being made of a resilient yieldable plastic which has a styrene butadiene polymer base.
Claim 3
Dependent Claim
238 words
A safety dart comprising a shaft having an elongated free end portion terminating in an end surface situated at one end of said shaft, said elongated free end portion being formed with an opening passing transversely through said elongated free end portion and spaced from said end surface, said suction cup fixed to said shaft at said free end portion thereof, said suction cup having a cup portion situated beyond said end surface and an elongated rear neck portion surrounding said elongated free end portion of said shaft with said elongated free end portion of said shaft extending into said rear elongated neck portion of said suction cup, and means fixed to said neck portion of said suction cup and extending through said opening for mechanically fixing said suction cup to said shaft, said means filling said transverse opening, and said means being integral with and made of the same material as said suction cup, the material of said suction cup being bonded to the surface of said shaft for providing a connection with the latter in addition to the connection provided by said means, said shaft being made of a solid body of high impact plastic and said suction cup being made of a resilient yieldable plastic, and the latter two plastics having an affinity for each other providing the direct bonding of the plastics to each other without any additional material situated between the bonded plastics.
Claim 4
Dependent Claim
238 words
A safety dart comprising a shaft having an elongated free end portion terminating in an end surface situated at one end of said shaft, said elongated free end portion being formed with an opening passing transversely through said elongated free end portion and spaced from said end surface, said suction cup fixed to said shaft at said free end portion thereof, said suction cup having a cup portion situated beyond said end surface and an elongated rear neck portion surrounding said elongated free end portion of said shaft with said elongated free end portion of said shaft extending into said rear elongated neck portion of said suction cup, and means fixed to said neck portion of said suction cup and extending through said opening for mechanically fixing said suction cup to said shaft, said means filling said transverse opening, and said means being integral with and made of the same material as said suction cup, the material of said suction cup being bonded to the surface of said shaft for providing a connection with the latter in addition to the connection provided by said means, said shaft being made of a solid body of high impact plastic and said suction cup being made of a resilient yieldable plastic, and the latter two plastics having an affinity for each other providing the direct bonding of the plastics to each other without any additional material situated between the bonded plastics.
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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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |