Mechanical guns and projectors – Element – For archery projector
Patent
1990-03-27
1991-09-03
Reese, Randolph A.
Mechanical guns and projectors
Element
For archery projector
42 106, F41B 500
Patent
active
050443518
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a shock-absorber for sporting and hunting bows.
It has hitherto been customary to fit counterweights or directional stabilizers to the bow by means of rubber bearings acting as vibration dampers. during aiming and shooting, however, this does not prevent the bow from being disturbed by inadequate damping and inherent stability of the rubber bearings.
The purpose of this invention is to reduce the aiming and shooting problems by means of improved shock-absorber.
According to the invention, this is accomplished by means of a shock-absorber for sporting and hunting bows, comprising a counterweight which is fitted to the bow by means of a hydraulic or pneumatic shock-absorber.
Preferably the counterweight consists of a V-bar. The V-bar generally consists of a front bar which is attached to the bow in the direction of the shot and a bifurcated bar attached to the back side of the bow. Weighing elements can then be attached to the ends of the front bar and the bifurcated bar.
The shock-absorber may be fitted to the bow by means of a hydraulic or pneumatic shock-absorber. The shock-absorber is preferably fitted in such a manner that the piston-rod is secured to the bow in the direction of the shot and that the counterweight, in the form of a conventional V-bar, is fitted to the damperhousing. The hydraulic or pneumatic damper makes it possible to fit the stabilizing weights to the bow in such a manner as to permit damped movement between, the weights and the bow during shooting, although the said weights act as though they were mounted "rigidly" horizontally and vertically to the direction of the shot. This provides the highest possible aiming and shooting accuracy, in conjunction with damping in the direction of the shot. As a result of this, the energy remaining in the bow is absorbed as soon as the arrow is released, and the shock of the release is considerably reduced.
In the case of hunting bows in particular, the damper-housing itself may form the counter- or stabilizing weight, or the latter may be in the form of a short stabilizer.
The hitherto usual rubber bearings are no longer necessary or may be made hard. This provides the advantage of complete aiming stability, i.e. stabilizer-vibration during aiming, arising from soft rubber bearings, is eliminated.
The invention is described in greater detail hereinafter in conjunction with the drawings attached hereto, wherein:
FIG. 1 is a diagrammatical side elevation of a bow with the shock-absorber fitted; and
FIG. 2 is an axial cross-section through the hydraulic shock-absorber in FIG. 1, to an enlarged scale.
A hydraulic shock-absorber 2 is fitted to bow 1, shown in FIG. 1, in such a manner that piston-rod 3 points in the direction of the shot. Secured to housing 4 of shock-absorber 2 is a conventional stabilizing counterweight 5 which, in this example of embodiment, is in the form of a so-called V-bar.
As shown in FIG. 2, piston-rod 3 of shock-absorber 2 is provided with a piston 6. In the design shown in FIG. 2, shock-absorber 2 is in the form of a single-tube damper. Arranged in piston 6 are one or more passages 7 which serve to connect oil-chambers 9 located on each side of piston 6. Oil-chambers 9 are closed off by means of plugs 10, 11, plug 10 being secured to housing 4 whereas plug 11 is adapted to move along piston-rod 3 and acts as a separating piston. Arranged between plug 10 and piston 6, and between piston 6 and plug 11, are springs 8 which keep piston 6 centred. Arranged at the opposite end of housing 4 is a plug 13. Arranged between plug 13 and axially displaceable plug 11 is a preloading spring 12. Plugs 10 and 11 are sealed off from piston-rod 3 by expanding-ring seals 14 actuated by oilpressure.
One end of piston-rod 3 is provided with a thread 15 and a lock-nut 16 for attachment to the bow. Stabilizing counterweight 5 is adapted to be inserted, in parallel with piston-rod 3, into a sleeve 17 fitted to housing 4.
Shock-absorber 2 causes the vibration-energy of the mass of bow 1 to be transferred, through piston-rod
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Amerika-Bogen-Handelsgesellschaft mbH
Reese Randolph A.
Thompson Jeffrey L.
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