US3683883A

US3683883A - Stabilizer for archery bow

Info

Publication number: US3683883A
Application number: US117943A
Authority: US
Inventors: Tadao Izuta
Original assignee: Nippon Gakki Co Ltd
Current assignee: Nippon Gakki Co Ltd
Priority date: 1970-03-02
Filing date: 1971-02-23
Publication date: 1972-08-15
Anticipated expiration: 1989-08-15

Abstract

A stabilizer for an archery bow comprising a rod member and a weight body integrally connected to the free end of the rod member the other end of which is fixed to an archery bow, is further improved in such a manner that the weight body is formed into a non-magnetic outer casing housing a plurality of weight members made of a permanent magnet material so that the weight members can be freely moved inside of the outer casing against magnetic forces caused by the permanent magnet weight members, whereby energy of any vibration or shock, attraction or repression, caused in the archery bow and transmitted to the weight members is consumed within the weight body and the intensity of the vibration or shock is rapidly minimized.

Description

United States Patent Izuta [54] STABILIZER FOR ARCHERY BOW [72] Inventor: Tadao lzuta, Hamamatsu, Japan [73] Assignee: Nippon Gakki Seizo Kabushiki Kaisha, Shizuoka-ken, Japan [22] Filed: Feb. 23, 1971 [21 Appl. No.2 1 17,943

[30] Foreign Application Priority Data March 2, 1970 Japan ..45/2012l March 2, 1970 Japan ..45/20122 Oct. 27, 1970 Japan ..45/ 106038 [52] US. Cl. ..l24/30 R, 124/24, 267/136 [51] Int. Cl ..F4lb 5/00 [58] Field of Search ..l24/25, 24, 23, 35, 22, 30 R, 124/41; 267/136, 137

[56] References Cited UNITED STATES PATENTS 3,342,172 9/1967 Sanders ..l24/30 R X 3,412,725 11/1968 Hoyt ..124/30 R X [15 3,683,883 Aug. 15, 1972 7/1969 Cress 124/30 R Primary Examiner-Richard C. Pinkham I 8 Assistant Examiner-William R. Browne Attorney-Ostrolenk, Faber, Gerb & Soffen ABSTRACT A stabilizer for an archery bow comprising a rod member and a weight body integrally connected to the free end of the rod member the other end of which is fixed to an archery bow, is further improved in such a,

7 Claims, 6 Drawing Figures PATENTEDMM I912 3.883.883

SHEEI 1 OF 2 Fig.7

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5a W 5d 5a SNSN INVENTOR 7770/40 /ZV74 STABILIZER FOR ARCHERY BOW BACKGROUND OF THE INVENTION This invention relates to stabilizers which are employed on an archery bow for absorbing vibration or shock created therein so that the hitting rate of the archery bow is substantially improved.

When an arrow is notched on an archery bow and the latter is fully drawn, a vibration of small amplitude butof a higher pitch is created due to the highly tensioned archers muscles, and when the arrow is released, vibration or shock of far more intensified amplitude is created due to the abrupt recovery of the limbs and the string of the archery bow to their original positions. In order to absorb these vibration and shock for stabilizing the operation of the archery bow and for improving hitting rate thereof, one or more of stabilizers are attached to the handle riser of the archery bow. However, most of the conventional stabilizers have been constructed in rather a simple manner comprising a weight body and a comparatively long rod member integrally joined to each other so that the stabilizer can be vibrated easily. Although various proposals have been made for improving the vibration or shock absorbing nature of the stabilizer, most of them are concerned with the construction of the rod member and its attaching portion to the archery bow, and as faras I am aware, no recognizable improvement has not yet been proposed for the construction of the weight body.

SUMMARY OF THE INVENTION Therefore, a primary object of the present invention is to provide a stabilizer wherein the weight body itself is formed into an improved construction, and the vibration or shock absorbing nature of the stabilizer is substantially improved.

Another object of the present invention is to provide a stabilizer wherein the center of gravity of an archery bow can be adjusted as desired.

Still another object of the invention is to provide a stabilizer wherein the assembling of component weight members is extremely simple.

These and other objects of the present invention can be achieved by a stabilizer having a weight body and a rod member, the weight body comprising a weight body with magnetic pieces stacked together within the weight body, and a magnetic member fixed to the weight body for magnetically attracting the plurality of magnetic pieces.

According to another embodiment of the invention, the magnetic poles of the plurality of permanent magnet pieces are so arranged that the permanent magnet pieces repel against each other.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings:

FIG. 1 is a fragmentary profile view, partly in section, of a stabilizer constituting a first embodiment of the present invention, which is attached to the handle portion of an archery bow;

FIG. 2 is longitudinal sectional view of the weight portion of the stabilizer which constitutes a modification of the first embodiment of the invention;

FIG. 3 is a fragmentary profile view, partly in section, of a stabilizer constituting a second embodiment ofthe invention attached to the handle portion of an archery bow;

FIG. 4 is a longitudinal sectional view of the weight portion of the stabilizer constituting a modification of the second embodiment of the invention;

FIG. 5 is a similar view of the weight portion of the stabilizer shown in FIG. 4 wherein the polarity disposition of the permanent magnet pieces is further modified; and

FIG. 6 is a longitudinal sectional view of the weight portion of the stabilizer which constitutes a third embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION Referring now to FIG. 1 showing a stabilizer constituting a first embodiment of the present invention, the stabilizer comprises a rod member 1 made of aluminum, a synthetic resin, or FRP, and a weight body 2 integrally attached to an end of the rod member 1.

The weight body 2 is formed into a hollow construction having a cylindrical case 2a and a cap 3 both being made of non-magnetic material such as aluminum or a synthetic resin. Inside of the case 2a, three

permanent magnets

4a, 4b, and 40 made of Alunico, ferrite, or the like are stacked together side by side with the north and south magnetic poles arranged in the same order, so that they are magnetically attracted by each other. At the inside bottom of the case 2a, a magnetic coupling member 6 is bonded to the bottom wall of the case 2a, and the above mentioned stack of the three

permanent magnets

4a, 4b, and 4c are attracted by the magnetic coupling member 6 so that a void space '5 is formed near the entrance end of the case 2a where the cap 3 is fixedlyattached by any suitable means.

In a modification of this embodiment shown in FIG. 2, the cap 3 is made of a magnetic material for attracting the stack of three permanent magnets 40, 4b, and 40 so that a void space 5 is formed at the bottom portion of the case 2a. In this case, the magnetic coupling member 6 as indicated in FIG. 1 can be eliminated.

With the constructions of the weight body shown in FIGS. 1 and 2, the

permanent magnets

4a, 4b, and 4c are attracted together in the normal condition and further attracted by the coupling member 6 or cap 3, and when the stabilizer is subjected to a vibration or shock, the permanent magnets are forced to be moved against the attracting forces between ,these magnets and coupling member or cap, whereby the energy of the vibration or shock is consumed more rapidly than in the conventional stabilizers. Furthermore, the number of the permanent magnets may be changed to any suitable number from three as exemplarily indicated in FIGS. 1 and 2, whereby the center of gravity of the stabilizer may be changed as desired. Since these permanent magnets are automatically stacked together by the magnetically attracting forces acting between the permanent magnets, there is no necessity of the magnets being bonded in the case of the assembling of the stabilizer, and a required number of the permanent magnets stacked together are merely inserted inside of the hollow case 2a and the cap 3, thus economizing labor required for assembling the stabilizer.

In FIG. 3, there is indicated a second embodiment of the present invention wherein the weight body 2 is formed into a hollow construction having a cylindrical casing 2a, a gap adjusting member 4 threadedly engaged with one end thereof, and a cap 3 attached to the other end. Inside of the cylindrical casing 2a, there are located two weight members a and 5b. The casing 2a may consist of aluminum, synthetic resin, or the like non-magnetic material, and between the weight member 5a and the gap adjusting member 4 and also between the weight member 5b and the cap 3, there are provided

rubber cushions

6, 6. The weight members 5a and Sb are made of permanent magnetic material such as Alunico, ferrite, or the like, formed into short cylindrical configuration, and the weight members are housed in the casing 2a in such a manner that the north and south magnetic poles of the weight members are arranged in opposite or reverse orders, so that a repelling force acts therebetween. As a result, the two weight members are repelled against each other and urged toward the gap adjusting member 4 and als toward the cap 3.

In FIG. 4, there is indicated modification of the second embodiment, wherein four

weight members

5a, 5b, 5c, and 5d are provided inside of the casing 2a. The magnetic poles of the adjacent pair of weight members are arranged in opposite orders with a repelling force acting therebetween, so that the

weight members

5a and 5b located at both ends are urged outwardly onto the

rubber cushions

6, 6, and the intermediately disposed two

weight members

5c and 5d located floatingly in spaced relationship between these two

weight members

5a and 5b.

In FIG. 5, another modification of the second embodiment of the present invention is shown wherein the magnetic poles of outwardly disposed two

weight members

5a and 5d or 5b and 5c are respectively arranged in the same orders and the magnetic poles of the intermediately disposed two

weight members

5c and 5d are arranged in opposite orders, so that the endwise adjacent pair of the

weight members

5a and 5d or 5b and 5c attract each other but the intermediate pair of the

weight members

5c and 5d repel each other. As a result, the adjacent pair of

weight members

5a and 5d attracting each other are urged rightwardly onto the rubber cushion 6 and the other adjacent pair of

weight members

5b and 5c attracting each other are urged leftwardly onto the rubber cushion 6 at the leftward end, and a comparatively large void space is formed centrally between the two pairs of the weight members.

In either of the constructions shown in FIGS. 3, 4, and 5, when the weight body is integrally connected with the rod member 1 to form a stabilizer, and when the stabilizer thus formed is attached to the handle portion of an archery bow, any vibration or shock caused in the archery bow is transmitted to the stabilizer and the weight body is swung around the bottom portion of the rod member 1. Inside of the casing of the weight body, the magnetic weight members are moved against the magnetic forces reciprocally, and the vibration or ,shock will be rapidly reduced because of the energy consumption within the magnetic weight members. Furthermore, the total weight of the weight members may be changed by suitably replacing the weight members, whereby the center of gravity of the archery bow can be adjusted as desired.

In FIG. 6, there is indicated a third embodiment of the present invention wherein the stacking direction of the magnetic weight members is selected to be perpendicular to the longitudinal direction of the rod member. In this embodiment, a stabilizer comprising a rod member 1 and a weight body 2 is attached to the handle portion of the archery bow through a mounting member 8 of an ordinary construction. The weight body 2 further comprises a cylindrical casing 2a with a gap adjustable cap 3 and a plurality of permanent magnet weight members the number of which is exemplarily selected in three. The casing 2a is made of a nonmagnetic material such as aluminum, synthetic resin, or the like, and the three permanent

magnet weight members

5a, 5b, and 5c are made of a permanent magnetic material such as Alunico, ferrite, or the like. The

weight members

5a, 5b, and 5c are further formed to be freely slidable inside of the casing 2a and for

instance rubber cushions

6a and 6b are provided at both ends of the interior of the casing 20 so that any movement of the end weight members Sn and 50 can be received resiliently by means of the

rubber cushions

6a and 6b. In the shown example, the magnetizing directions of these three

weight members

5a, 5b, and 5c are selected to be opposite one from the other so that the same north or south magnetic poles appear on the confronting surfaces of the adjacent weight members, whereby the

weight members

5a, 5b, and 5c repel each other and an interval of gap is formed between each pair of the confronting surfaces of the weight members 50, 5b, and 50. These intervals of the gaps canbe adjusted by adjusting the cap 3 along the longitudinal directionof the casing 2a. As a characteristic feature of this embodiment, the casing 2a is provided with a connecting portion at one side ofits peripheral wall intermediately along its length, and the connecting portion is integrally connected with the free end of the rod member 1 for instance by thread engagement. By this way, the stacking direction of the

weight members

5a, 5b, and 5c is made perpendicular to the axial direction of the rod member 1.

When the stabilizer, in accordance with this embodiment, is attached to the handle portion of an archery bow through the mounting member 8 as described above, with the direction of the longitudinal axis of the casing 2a being determined suitably, any vibration or shock created in the archery bow is transmitted to the stabilizer through the mounting member 8 and rod member 1, and the weight body 2 will be swung around the fixed end of the rod member 1. When the weight body 2 is swung around the fixed point, the

weight members

5a, 5b, and 50 included in the casing 2a of the weight body 2 will be moved along the axial direction of the casing 2a against the magnetic forces exerted therebetween, and the energy of the vibration or shock thus transmitted to the

weight members

5a, 5b, and 5c will be consumed. It should be noted that, in this embodiment, when the direction of the longitudinal axis of the casing 2a is suitably adjusted, the

weight members

5a, 6b, and 5c slidably located inside of the weight body 2 are reciprocated more effectively against the magnetic forces, and the vibration or shock created in the archery bow can be rapidly reduced.

What is claimed is:

l. A stabilizer foran archery bow comprising a rod member adapted to be fixed at a suitable position on an archery bow, said rod having a free end, a weight body connected to the free end of the rod member, said weight body comprising a non-magnetic outer casing,

said casing including a plurality of individual weight members therein, said weight members being permanent magnets, said weight body being larger in size than necessary to house the weight members, and said weight members being individually movable inside of said casing in side by side relationship so that energy of any vibration or shock transmitted to the weight members is thereby consumed.

2. A stabilizer as set forth in claim 1 wherein said weight body further comprises a magnetic member attached to and positioned inside of said casing, any one of said weight members being magnetically attracted by said magnetic member.

3. A stabilizer as set forth in claim 2 wherein the north to south magnetic poles is the arrangement of said weight members.

4. A stabilizer as set forth in claim 1 wherein the weight members are arranged in said weight body in a north-north, south-south manner so that a repelling force acts between the weight members.

5. A stabilizer as set forth in claim 1 wherein said plurality of weight members consists of four permanent magnets, and the north magnetic poles of the adjacent pair of permanent magnets adjacent each other with a repelling force acting therebetween.

6. A stabilizer as set forth in claim 1 wherein said plurality of weight members consists of four permanent magnets, the north magnetic poies of the outwardly disposed pair of permanent magnets are positioned away from each other and the north magnetic poles of. the intermediately disposed adjacent pair of permanent magnets are arranged facing each other.

7. A stabilizer as set forth in claim 1 wherein the outer casing made of a nommagnetic material is connected to the free end of the rod member in such a manner that the longitudinal axis of the outer casing is disposed perpendicular to the longitudinal axial of the rod member.

Claims

1. A stabilizer for an archery bow comprising a rod member adapted to be fixed at a suitable position on an archery bow, said rod having a free end, a weight body connected to the free end of the rod member, said weight body comprising a non-magnetic outer casing, said casing including a plurality of individual weight members therein, said weight members being permanent magnets, said weight body being larger in size than necessary to house the weight members, and said weight members being individually movable inside of said casing in side by side relationship so that energy of any vibration or shock transmitted to the weight members is thereby consumed.

6. A stabilizer as set forth in claim 1 wherein said plurality of weight members consists of four permanent magnets, the north magnetic poles of the outwardly disposed pair of permanent magnets are positioned away from each other and the north magnetic poles of the intermediately disposed adjacent pair of permanent magnets are arranged facing each other.

7. A stabilizer as set forth in claim 1 wherein the outer casing made of a non-magnetic material is connected to the free end of the rod member in such a manner that the longitudinal axis of the outer casing is disposed perpendicular to the longitudinal axial of the rod member.