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US3990705A Expired / Lapsed US ⏱️ 0.0 years remaining

Dart flights

Assignee: Clarke and Merrifield Ltd
•
Filing: 1975-07-18
•
Granted: 1976-11-09
•
Expires: 1995-07-18
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Abstract

Abstract A dart flight assembly comprises an adaptor one end of which is arranged to be fitted to the body of a dart, at least one thin metal pin which protrudes from the other end of the adaptor, and at least three blades made from folded sheet plastics material spaced around and mounted directly on the at least one metal pin. A dart flight assembly may have a single pin which is threaded between the flight blades at their junction along the axis of the assembly. Alternatively there may be the same number of metal pins as there are flight blades, the pins being arranged substantially parallel to each other and each pin being held in tangential contact with adjacent pins over part of its length, the ends of the pins remote from the adaptor having equiangular spaced flight blades folded from sheet plastics material slid between them so that the blades are prevented from rotating with respect to the pins.

Inventors

  • 👤 Robert L. Clarke

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 23:12
CPC Classifications
F; F42; F42B; F42B6/00; F42B6/003

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 104 words
A dart flight assembly comprising an adaptor, one end of said adaptor being shaped to be fitted to the body of a dart, at least three thin metal pins protruding from the other end of said adaptor, at least three flight blades, there being the same number of flight blades as of said metal pins, and means holding each of said pins in tangential contact with the adjacent pins over part of its length, said flight blades being equi-angularly spaced and positioned between the ends of said pins remote from said adaptor, whereby said blades are prevented from rotating with respect to said pins.
Claim 2
Dependent Claim 104 words
A dart flight assembly comprising an adaptor, one end of said adaptor being shaped to be fitted to the body of a dart, at least three thin metal pins protruding from the other end of said adaptor, at least three flight blades, there being the same number of flight blades as of said metal pins, and means holding each of said pins in tangential contact with the adjacent pins over part of its length, said flight blades being equi-angularly spaced and positioned between the ends of said pins remote from said adaptor, whereby said blades are prevented from rotating with respect to said pins.
Claim 3
Dependent Claim 18 words
The dart flight assembly of claim 1 in which there are four metal pins and four flight blades.
Claim 4
Dependent Claim 26 words
The dart flight assembly of claim 1, further comprising a sleeving made from a thermoplastics material sheathing said pins between said adaptor and said flight blades.
Claim 5
Dependent Claim 16 words
The dart flight assembly of claim 1, wherein said adaptor is made from a thermoplastics material.
Claim 6
Dependent Claim 15 words
The dart flight assembly of claim 1, wherein said adaptor is made of a metal.
Claim 7
Dependent Claim 16 words
The dart flight assembly of claim 1, wherein said metal pins are made from spring steel.
Claim 8
Dependent Claim 77 words
The dart flight assembly of claim 1, wherein there are three said metal pins, one of said pins being longer than the others of said pins, said ends of said others of said pins being splayed apart and being bent towards said one longer pin, and said end of said one longer pin being bent towards said others of said pins whereby said end of said longer pin is nested between said ends of said other pins.
Claim 9
Dependent Claim 17 words
The dart flight assembly of claim 1, wherein said flight blades are folded from polyester sheet material.
Claim 10
Dependent Claim 32 words
The dart flight assembly of claim 1, wherein said one end of said adaptor which is shaped to be fitted to the body of a dart is formed as a screw-threaded spigot.

References Cited (Backward Citations)

GB531326A Cited
GB534289A Cited
GB584993A Cited
GB664850A Cited
GB679970A Cited
US3595579A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1979-11-09 1980-05-10 1980-11-09 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1983-11-09 1984-05-10 1984-11-09 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1987-11-09 1988-05-10 1988-11-09 $7700.00 Window Closed / Lapsed

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