Mechanical guns and projectors – Element – For archery projector
Patent
1993-08-16
1995-01-31
Nicholson, Eric K.
Mechanical guns and projectors
Element
For archery projector
188378, F41B 520
Patent
active
053851366
ABSTRACT:
The preferred embodiment of an impulse stabilizer for reducing the effects of a mechanical impulse produced by apparatus including archery bows or air-rifles comprises a sealed elongated housing containing along its axis from one end to the other: a first cushion; a first mass that is elongated, contains an axial hole, is surrounded with one or more bushings, and that only loosely fits within the housing; a coil type spring under compression; a second mass that is the same as the first mass except that its length, density, or hole cross-section area may be different; and a second cushion. The voids within the housing are essentially filled with a fluid such as hydraulic fluid. The dimensions are such that, at rest, the spring urges both masses against their adjacent cushions. When the stabilizer is subjected to an impulse, one mass moves away from its adjacent cushion against its inertia, the restorative force of the spring, and the damping of the fluid flowing through its hole and around its periphery in such a manner as to reduce the effects of the impulse. An impulse in the opposite direction similarly activates the other mass. Both masses are similarly affected by the spring. However, since they may differ in mass and may offer differing resistance to the fluid, the response may be different depending on the direction of an impulse. An alternate embodiment optionally does not use cushions, bushings, or holes.
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patent: 4986018 (1991-01-01), McDonald
patent: 5044351 (1991-09-01), Pfeifer
Archery Dynamics, Inc.
McLaughlin James C.
Nicholson Eric K.
Ricci John A.
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