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US 9,541,358 B2Granted
Blow pipe dart
OwnerRalph Robertson Hepburninventor
Life of this patent
Estimating the term…
Abstract
An elastomeric blow pipe dart (10) including: a generally circular body portion (12); a tapered portion (16) extending from the generally circular body portion (12); and a nose (18) having a smaller diameter than the tapered portion (16) and extending from the tapered portion (16) to a tip (20). The blow pipe dart (10) may comprise a soft rubber, and the nose (18) may define an end bore (26) so that air passes through the nose (18) when the dart (10) is launched.
Claims10
A blow dart apparatus for amusement, the apparatus comprising:
- a blow pipe (30) formed by a hollow tube;
- and
- an elastomeric blow pipe dart (10) for insertion within the blow pipe (30), the hollow tube dimensioned to be slightly wider than a diameter of the blow pipe dart (10), the blow pipe dart (10) molded from soft rubber and having:
- a generally circular body portion (12);
- a tapered portion (16) extending from the generally circular body portion (12), the tapered portion (16) being centrally located within the dart (10);
- a circular boss (14) protruding from the circular body portion (12), the circular boss (14) spacing the circular body portion (12) and the tapered portion (16) apart and away from an inner wall of the blow pipe thereby providing reduced contact between the dart (10) and the inner wall of the blow pipe (30), the circular boss (14) being located at a rear-most extreme location of the dart (10);
- a main bore (22) located within the body portion (12);
- a nose (18) having a smaller diameter than the tapered portion (16) and extending from the tapered portion (16) to a tip (20) located at a front-most extreme location of the dart (10), the nose (18) being narrow and tapered from the tapered portion (16) to the tip (20), the body portion (12) being located within the dart (10) between the tapered portion (16) and the circular boss (14);
- an end bore (26) located within the nose (18), the end bore (26) having a smaller diameter than the main bore (22) thereby forming a restriction of air flow at the tapered portion (16) so as to provide limited leakage of air from the tip (20);
- and
- a contiguous passage formed internal to the dart (10) and extending along a longitudinal axis of the dart (10) from the front-most location of the dart (10) to the rear-most location of the dart (10) for air flow formed by the end bore (26) and the main bore (22) where the limited leakage of air from the tip (20) provides pressure reduction within the main bore (22) thus reducing speed of the dart.
8 more elements
A blow dart apparatus for amusement, the apparatus comprising:
- a blow pipe (30) formed by a hollow tube;
- and
- an elastomeric blow pipe dart (10) for insertion within the blow pipe (30), the hollow tube dimensioned to be slightly wider than a diameter of the blow pipe dart (10), the blow pipe dart (10) molded from soft rubber and having:
- a generally circular body portion (12);
- a tapered portion (16) extending from the generally circular body portion (12), the tapered portion (16) being centrally located within the dart (10);
- a circular boss (14) protruding from the circular body portion (12), the circular boss (14) spacing the circular body portion (12) and the tapered portion (16) apart and away from an inner wall of the blow pipe thereby providing reduced contact between the dart (10) and the inner wall of the blow pipe (30), the circular boss (14) being located at a rear-most extreme location of the dart (10);
- a main bore (22) located within the body portion (12) wherein side walls thereof have a first thickness;
- a nose (18) having a smaller diameter than the tapered portion (16) and extending from the tapered portion (16) to a tip (20) located at a front-most extreme location of the dart (10) wherein the nose (18) is narrow and tapers from the tapered portion (16) to the tip (20), the body portion (12) being located within the dart (10) between the tapered portion (16) and the circular boss (14);
- an end bore (26) contiguous with the main bore (22) and located within the nose (18), the end bore (26) having a smaller diameter than the main bore (22) wherein side walls thereof have a second thickness significantly less than the first thickness;
- and
- the side walls of the end bore (26) are sufficiently thin relative to the side walls of the main bore (22) thereby providing a means for easily deforming the nose (18) upon impact.
8 more elements
Dependencies are inferred from the claim text.