U.S. patent number 3,757,761 [Application Number 05/197,680] was granted by the patent office on 1973-09-11 for archery bow having vibration dampener.
This patent grant is currently assigned to Nippon Gakki Seizo Kabushiki Kaisha. Invention is credited to Tadao Izuta.
United States Patent |
3,757,761 |
Izuta |
September 11, 1973 |
ARCHERY BOW HAVING VIBRATION DAMPENER
Abstract
An archery bow being provided with at least one pair of
stabilizers or vibration dampeness each of which comprises a
vibrator, such as a rod- member with a weight mounted at the free
end thereof. The vibrator extends over the limb section of the
archery bow, and is directly connected to the limb section through
an elastic member, such as a coil spring. The vibrator is also
connected to the bow at another location on the bow. The shock and
vibration caused by the limb section is directly and immediately
transmitted to the vibrator through the elastic member, and is
effectively absorbed by the vibrator. The elastic member prevents
the shock or vibration that is once transmitted from the limb
section to the vibrator to be fed back to the limb section.
Inventors: |
Izuta; Tadao (Shizuoka-ken,
Hamamatsu-shi, JA) |
Assignee: |
Nippon Gakki Seizo Kabushiki
Kaisha (Hamamatsu-shi, JA)
|
Family
ID: |
22730331 |
Appl.
No.: |
05/197,680 |
Filed: |
November 11, 1971 |
Current U.S.
Class: |
124/23.1;
124/89 |
Current CPC
Class: |
F41B
5/1426 (20130101) |
Current International
Class: |
F41B
5/00 (20060101); F41B 5/20 (20060101); F41b
005/00 () |
Field of
Search: |
;124/3R,23,24,25
;248/358R ;267/136 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Pinkham; Richard C.
Assistant Examiner: Browne; William R.
Claims
What is claimed is:
1. An archery bow having a handle section; limb sections extending
from said handle section at both ends thereof; and at least one
pair of stabilizers each comprising an elongated vibrating member
extending over one of said limb sections, means for elastically
supporting said vibrating member, said elastically supporting means
being connected with said vibrating member near one end of said
vibrating member and also being connected with said one limb
section; said vibrating member being directly connected near its
other end to said one limb section, at a position spaced from the
connection to the bow for said one end, near the other end of said
vibrating member.
2. The archery bow as claimed in claim 1, wherein said vibrating
member is formed into a rod member with a free end, and is provided
with a weight at the free end thereof.
3. The archery bow as claimed in claim 1, wherein said bow has a
connecting portion between said handle and said limb sections and
said vibrating member is attached to said connecting portion of
said handle and limb sections.
4. The archery bow as claimed in claim 1, wherein said elastically
supporting means is a coil spring.
5. The archery bow as claimed in claim 1, wherein said vibrating
member is connected with said one limb section near said vibrating
member's other end by a coupling, said coupling member is
frictionally engaged with said vibrating member and said one limb
section so that it can be slidable along said vibrating member and
said one limb section.
6. The archery bow as claimed in claim 1, wherein said vibrating
member is a plate spring, and said elastically supporting means is
a rubber cushion.
7. The archery bow as claimed in claim 1, wherein said elastically
supporting means is integrally with said vibrating member and is
curved toward said one limb section so as to provide a thrusting
force to said one limb section.
8. The archery bow as claimed in claim 7, wherein said vibrating
member is a plate spring.
Description
BACKGROUND OF THE INVENTION
This invention relates to an archery bow which is provided with at
least a pair of stabilizers acting on the limb sections.
In a conventional archery bow, a vibration or shock being caused in
the handle section (rigid center section) is absorbed or reduced by
one or more stabilizers each consisting of a vibratory rod member
with a weight connected at the free end thereof. Such stabilizers
are usually attached to the handle section of an archery bow. This
vibration or shock in the handle section is propagated from the
limb sections, and is created by quick recoveries of the limb
sections and the string to their original positions when the arrow
is released after full drawing. Such vibration or shock is not a
definite one but differs due to the natural vibration of the bow
body as well as due to each strength of recovery of the limb
sections and the string of the archery bow to their original
position. In conventional structures of stabilizers, a vibration or
shock is absorbed or reduced only be means of the vibration of the
vibratory rod, and therefore, the amplitude of the vibration is a
definite one and it is impossible to regulate the amplitude of
vibration to cope with the natural vibration of the bow body. As
further demerits of the conventional stabilizer for an archery bow,
the absorption or reduction of the vibration or shock is slow since
the absorption or reduction comes into effect after the vibration
or shock is propagated into the handle section, to which the
stabilizers are attached.
SUMMARY OF THE INVENTION
The principal object of the present invention is to provide an
archery blow having stabilizers in which a vibration or shock which
is brought about in the limb sections is absorbed or reduced in
each limb section before it is propagated into the handle section,
the absorption or reduction of the vibration or shock being carried
out desirably by means of stabilizers each comprising a vibrator
extending over the limb section, and an elastic member attached
between the vibrator and each limb section.
Other objects, features and advantages of the present invention
will be apparent from the following description, taken in
connection with the accompanying drawings, in which the figures
show several embodiments of the invention. It is to be expressly
understood, however, that the drawings are for the purpose of
illustration and description only and are not designed as a
definition of the invention, reference being had for this purpose
to the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
FIG. 1 is a side view of an archery bow having stabilizers of the
first embodiment of the present invention;
FIG. 2 is a fragmentary side view partly in section of the
stabilizer shown in FIG. 1;
FIG. 3 is a fragmentary side view partly in cross section of an
archery bow having a stabilizer embodying the second embodiment of
the present invention; and
FIG. 4, and FIG. 5 are fragmentary side views of archery bows,
respectively showing the third and fourth embodiments of the
present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the drawings, numerals 1, 1 designate limb sections extending
from the upper and lower ends of the handle section 2 of an archery
bow. Stabilizers 3, 3 are supported over the respective limb
sections 1, 1.
In the first embodiment of the invention shown in FIGS. 1 and 2,
each stabilizer 3 is composed of a rod vibrator 4 having a weight 5
such as a metal ball at the top free end thereof. The other end of
the vibrator 4 is connected through a universal joint 6 to a rod
support 7 attached to the coupling portion of the handle and limb
sections. A coil spring 8 is disposed between the rod vibrator 4
and the limb section 1 of the archery bow. That is, one end of the
coil spring 8 is connected to that portion of the rod vibrator 4
near the weight 5, and the other end thereof is connected to the
limb section 1.
In the archery bow provided with the stabilizer 3 of above
described construction, the elastic member 8 expands and contracts
due to the back-and-forth vibration of the limb section 1, and this
back-and-forth vibration of the limb section 1 is mostly
transmitted to the vibrator 4 through the coil spring 8, although
it is partly transmitted through the rod support 7. Consequently,
the vibrator 4 vibrates back and forth, simultaneously causing the
expansion and contraction of the elastic member 8. Accordingly, a
vibration or shock in the limb section 1 is rapidly absorbed or
reduced by the elastic movement of the elastic member 8 and the
vibration of the vibrator 4, and a slight vibration or shock
propagated in the handle section is also absorbed or reduced by the
vibration of the vibrator 4. The elastic coil spring 8 also acts to
prevent the shock or vibration once transmitted to the vibrator 4
to be returned back to the limb section 1.
In the second embodiment of the present invention shown in FIG. 3,
in the same way as the above-described first embodiment, the
vibrator 4 having the weight 5 at the top free end thereof is
located at the side of the limb section 1 by fixing the base end
thereof to the interconnecting portion of the limb section 1 and
the handle section 2 through an elastic damper 9, and the vibrator
4 is connected by an interconnecting member 10 at a position near
the weight 5. Both ends of the interconnecting member 10 are
slidably fitted to the rod vibrator 4 and the limb section 1,
respectively, by the frictional engagement therewith. Accordingly,
the interconnecting member 10 can be forcedly shifted along the
vibrator and limb section. In the above described construction, the
vibration or shock caused by the limb section is transmitted to the
vibrator 4 through the interconnecting member 10, and accordingly
the vibrator vibrates, thus absorbing and reducing the vibration or
shock in the limb section. The damper 9 helps the vibrator 4 to
vibrate more effectively. Moreover, the amplitude of vibration of
the vibrator 4 can be varied according to the varied positioning of
the interconnecting member 10, and therefore the vibration can be
regulated at archer's will by sliding the interconnecting member 10
along the vibrator and limb section. This interconnecting member 10
further contributes to the regulation of the bending strength of
the limb section 1.
In the third embodiment of the invention shown in FIG. 4, the
vibrator 4 is made of a plate spring. The base end of the plate
spring 4 is fitted to the coupling portion of the limb section 1
and the handle section 2. An elastic member 8 such as of rubber
cushion is interposed between the free end of the vibrator 4 and
the limb section 1, so that it connects therebetween, and shock in
the limb 1 is transmitted to the vibrator 4 through the elastic
member 8 and absorbed or reduced by means of said vibrator 4
vibrating together with the elastic member 8.
Lastly, in the fourth embodiment of the invention shown in FIG. 5,
the vibrator 4 consisting of a plate spring is made integrally with
an elastic member 8, wherein the free end portion of the vibrator 4
is curved toward the limb section 1, so that the curved end portion
elastically thrusts the limb section 1, causing an elastic action
between the vibrator 4 and the limb section 1. This construction
also permits the vibration or shock caused by the limb section to
be transmitted to the vibrator 4 through the curved elastic member
8.
As described above, according to the present invention, a vibration
or shock can be absorbed or reduced instantly in the limb sections
of an archery bow, and therefore, the archery bow of this invention
is more effective than the conventional ones, in which the
vibration or shock is absorbed or reduced through the bow body. The
bow of the present invention can further attain a superior
stabilizing effect, since it enables the effective length of the
vibrator to be regulated at will.
* * * * *