Limb of archery bow

Abstract

Disclosed is a limb of an archery bow for eliminating problems involved in a conventional limb having a flat strip structure exhibiting an insufficient stability and an insufficient shooting speed. The disclosed limb includes wood layers, carbon layers, and fiber glass layers and has a concave or convex arc-shaped cross-sectional structure outwardly or inwardly gently bent in a longitudinal direction.

Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a limb of an archery bow, and more particularly to a limb of an archery bow which exhibits an increase in torsion strength and bending strength, thereby achieving an enhancement in stability and shooting speed.

[0003] 2. Description of the Related Art

[0004] Referring to FIG. 1, an archery bow for archery games is illustrated. As shown in FIG. 1, the archery bow typically includes a bow body 1, a pair of limbs 2 detachably coupled to upper end lower ends of the bow body 1, and a bowstring 3 coupled at both ends thereof to the limbs 2.

[0005] When an archer nocks an arrow onto the bowstring 3, and then draws the bowstring 3 using the arrow, the upper and lower limbs 2 are elastically bent. When the archer nocks releases the arrow, the bowstring 3 returns immediately to its original state by virtue of the resilience of the limbs 2, thereby shooting the arrow to a target.

[0006] In such an archery bow having the above mentioned configuration, the limbs serve as main means for shooting an arrow. The structure of these limbs directly have influence on the shooting speed and stability of the arrow, and the resistance to vibrations occurring immediately after the shooting of the arrow.

[0007] FIG. 2 is an enlarged perspective view illustrating a conventional limb. The limb, which is denoted by the reference numeral 2, is detachably coupled to one end of the bow body 1 by means of a coupling screw 4.

[0008] FIG. 3 is an enlarged cross-sectional view taken along the line A-A of FIG. 2. As shown in FIG. 3, the limb has a multilayer structure composed of wood layers 5, carbon layers 6, and fiber glass layers 7 symmetrically arranged with respect to the centerline of the structure thickness.

[0009] The reason why the limb has a multilayer structure is to obtain an increase in bending strength and torsion strength. The bending strength is directly related with the shooting speed of the arrow. The torsion strength is directly related with the stability of the limb exhibited immediately after the bowstring is released from a tensed state. That is, the torsion strength is directly related with the target hitting rate.

[0010] However, the conventional limb structure cannot have optimized bending and torsion strengths because its cross-sectional shape is rectangular.

SUMMARY OF THE INVENTION

[0011] Therefore, the present invention has been made to solve the above mentioned problem involved in the conventional limb, and an object of the invention is to provide a limb of an archery bow which has an arc-shaped multilayer cross-sectional structure composed of wood layers, carbon layers, and fiber glass layers, so that it obtains an increase in bending strength and torsion strength, thereby being capable of achieving an enhancement in the resistance to vibrations occurring when an arrow is shot, an improvement in stability, and an enhancement in shooting speed.

[0012] In accordance with the present invention, this object is accomplished by providing a limb for an archery bow including wood layers, carbon layers, and fiber glass layers, the limb having a concave or convex arc-shaped cross-sectional structure outwardly or inwardly gently bent in a longitudinal direction.

BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above objects, and other features and advantages of the present invention will become more apparent after a reading of the following detailed description when taken in conjunction with the drawings, in which:

[0014] FIG. 1 is a perspective view illustrating a conventional archery bow;

[0015] FIG. 2 is an enlarged perspective view illustrating a conventional limb;

[0016] FIG. 3 is an enlarged cross-sectional view taken along the line A-A of FIG. 2;

[0017] FIG. 4 is an enlarged perspective view illustrating a limb according to an embodiment of the present invention;

[0018] FIG. 5 is an enlarged perspective view taken along the line B-B of FIG. 4;

[0019] FIG. 6 is an enlarged perspective view taken along the line B-B of FIG. 4, illustrating the drawn state of a bowstring;

[0020] FIG. 7 is an enlarged perspective view illustrating a limb according to another embodiment of the present invention;

[0021] FIG. 8 is an enlarged perspective view taken along the line C-C of FIG. 7; and

[0022] FIG. 9 is an enlarged perspective view taken along the line C-C of FIG. 7, illustrating the drawn state of a bowstring.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Now, the present invention will be described in detail, in conjunction with embodiments illustrated in the annexed drawings.

[0024] In accordance with the present invention, a limb is provided which has a multilayer structure composed of wood layers, carbon layers, and fiber glass layers, and a concave or convex arc-shaped cross-sectional shape outwardly or inwardly gently bent in a longitudinal direction. In FIGS. 5, 6, 8, and 9, the wood layers, carbon layers, and fiber glass layers are denoted by the reference numerals 5, 6, and 7, respectively.

[0025] FIG. 4 is an enlarged perspective view illustrating a limb of an archery bow according to an embodiment of the present invention. Although the archery bow has upper and lower arc-shaped limbs, only one limb, that is, the upper arc-shaped limb, is illustrated for the simplicity of illustration because the upper and lower arc-shaped limbs have the same structure. In FIG. 4, the limb is denoted by the reference numeral 8. In the case of FIG. 4, the limb has a concave arc-shaped cross-sectional shape outwardly gently bent in a longitudinal direction in accordance with a first embodiment of the present invention.

[0026] FIG. 5 is a cross-sectional view taken along the line B B of FIG. 4. FIG. 5 illustrates the state in which the bowstring denoted by the reference numeral 3 is not drawn yet. In this state, there is no deformation generated at the arc-shaped limb 8. When the archer draws an arrow necked onto the bowstring 3 by 16 to 19 inches, the arc-shaped limb 8 is deformed to be laterally flattened, as shown in FIG. 6, so that it has an increased resilience.

[0027] When the archer abruptly releases the arrow after further drawing the arrow nocked onto the bowstring 3 by about 30 inches, the arrow is shot at an increased speed by virtue of not only the longitudinal resilience of the arc-shaped limb 8 returning to the original longitudinal state thereof, but also the lateral resilience of the arc-shaped limb 8 returning to the original cross-sectional shape.

[0028] FIGS. 7 to 9 illustrate a second embodiment of the present invention in which the arc-shaped limb 8 has a convex arc-shaped cross-sectional structure outwardly or inwardly gently bent in a longitudinal direction. The principle of this second embodiment is the same as that of the first embodiment shown in FIG. 4.

[0029] As apparent from the above description, in accordance with the present invention, the limb has a concave or convex arc-shaped cross-sectional structure, as shown in FIGS. 4 to 9. By virtue of such a structure, the bowstring 3 is strongly tensed when the archer draws the bowstring 3 by about 16 to 19 inches. At this time, the arc-shaped limb 8 is deformed to be laterally flattened, that is, to have an increased radius of curvature. By virtue of the structure according to the present invention, the bowstring 3 is rather easily drawn within a range of 20 to 30 inches.

[0030] When the archer releases the bowstring 3, the arc-shaped limb 8 exhibits a longitudinal resilience allowing it to return to its original longitudinal state and a lateral resilience allowing it to return to the original cross-sectional shape, so that it provides effects of increasing its torsion and bending strengths and increasing the shooting speed of the arrow.

[0031] Although the preferred embodiments of the invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

1. A limb for an archery bow including wood layers, carbon layers, and fiber glass layers, the limb having a concave or convex arc-shaped cross-sectional structure outwardly or inwardly gently bent in a longitudinal direction.