CN115468452A

CN115468452A - Bow arm protection device

Info

Publication number: CN115468452A
Application number: CN202110654889.5A
Authority: CN
Inventors: 刘吉昌
Original assignee: Poe Lang Enterprise Co Ltd
Current assignee: Poe Lang Enterprise Co Ltd
Priority date: 2021-06-11
Filing date: 2021-06-11
Publication date: 2022-12-13

Abstract

A pantograph arm protection device comprising: a bow arm; and the vibration protective layer is made of a material with deflection larger than that of the bow arm, is coated and combined on the bow arm and is bent when the bow arm is stressed, the deflection larger than that of the bow arm is bent along with the bow arm by virtue of the vibration protective layer, and absorbs the vibration of the bow arm in bending recovery so as to reduce the swing deformation amplitude, protect the internal structure of the bow arm from being torn and damaged, and effectively prolong the service life.

Description

Bow arm protection device

Technical Field

The invention relates to the technical field of sports equipment, in particular to a protection device for a bow arm.

Background

With the progress of the times, arches gradually become one of sports, even in large-scale competitions, archery competitions also exist, the archery operation is that a bowler holds the archery with one hand and lifts the archery forwards, pulls the bowstring with the other hand to make the bow arm bend and store force, then releases the pulled bowstring, and drives the archery to shoot out towards a target object through the force rebounded by the bow arm.

The bow arm is usually made of glass fiber, carbon fiber or wood, and the elastic force for providing archery is generated when the bow arm is bent under force through the arrangement of the internal fibers. Among them, glass fiber has the advantages of lightness, corrosion resistance, aging resistance, water and moisture resistance, insulation and the like, and is often used for manufacturing various sports equipment; carbon fiber has the advantages of high strength, light weight, high chemical resistance and high temperature resistance, and is also commonly used for sports equipment.

However, the glass fiber and the carbon fiber have a certain service life and will weaken the strength with the use time, as shown in fig. 5 and fig. 6, the bow arm 30 is a bow arm structure made of glass fiber, the bow arm 30 is assembled at one side of the bow body 40 by a connecting end 31, the bow arm 30 provides a pivot guide wheel 33 by a pivot hole 32 arranged at one end far away from the bow body 40, the guide wheels 33 of the two bow arms 30 combined at two sides of the bow body 40 can provide winding connection of the bowstring 41, so as to provide the power for pulling the bow arm 30; therefore, when the string is released, the energy stored in the bow arm 30 is restored by elastic deformation to eject the arrow through the bow string 41, which tends to make the bow arm 30 swing to and fro to a large extent (as shown by the dotted line in the figure).

Therefore, the bow arm 30 is pulled back and forth by the large reciprocating swing force, not only the vibration noise between the bow arm 30 and the bow body 40 is generated, but also the fiber arrangement organization structure inside the bow arm 30 is frequently deformed and pulled to form the crack 34 under the reciprocating swing operation, so that the bow arm cannot be used durably.

Disclosure of Invention

The main technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, and to provide a protection device for a bow arm, which protects the bow arm from bending and restoring vibration to reduce the swing deformation amplitude, so as to protect the structure of the bow arm from being damaged, and effectively improve the durability.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a bow arm protection device comprising:

a bow arm;

and a vibration protective layer is made of a material with deflection larger than that of the bow arm, is coated and combined on the bow arm and bends when the bow arm is stressed, bends along with the bow arm with deflection larger than that of the bow arm by virtue of the vibration protective layer, absorbs the vibration of the bow arm in bending recovery to reduce the swing deformation amplitude, and protects the structure of the bow arm from being torn and damaged.

The invention has the advantages that the bow arm is protected from vibration of bending recovery to reduce the swing deformation amplitude, the structure of the bow arm is protected from being damaged, and the service life is effectively prolonged.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a perspective view of the present invention.

FIG. 2 is a schematic cross-sectional view taken along line II-II of FIG. 1.

FIG. 3 is a schematic cross-sectional view of the line III-III shown in FIG. 1.

Fig. 4 is a schematic sectional view of the present invention in a state of use in which it is bent by force.

Fig. 5 is a schematic cross-sectional view of a bow arm structure made of glass fiber material bent under stress.

Fig. 6 is a schematic view of the conventional bow arm assembled on both sides of the bow body in use.

The reference numbers in the figures illustrate:

bow arm 10

Bending stress surface 11

Side 12

Pivot hole 13

Vibration protection layer 20

Bending protection sheet 21

Side protective sheet 22

Bow arm 30

Connection end 31

Pivot hole 32

Guide wheel 33

Crack 34

Bow body 40

Bow string 41

Detailed Description

Referring to fig. 1 to 4, a protection device for a bow arm of the present invention includes:

a bow arm 10;

and a vibration protection layer 20 is made of a material with deflection larger than that of the arm 10, the vibration protection layer 20 is coated and combined with the arm 10, and when the arm 10 is stressed to bend, the vibration protection layer 20 bends along with the arm 10 with deflection larger than that of the arm 10, absorbs vibration of the arm 10 in bending return to reduce swing deformation amplitude, and protects the arm 10 from tearing damage.

According to the above description, the present invention forms a protection structure by using the vibration protection layer 20 to cover and combine the circumference of the arm 10, and the material flexibility of the vibration protection layer 20 is greater than that of the arm 10, so as to absorb the vibration of the arm 10 after bending when the arm 10 is stressed.

Therefore, as shown in fig. 4, after one end of the bow arm 10 is pulled by the bow string via the pivoted guide wheel to be subjected to bending force and accumulation force to eject arrow, the vibration protection layer 20 larger than the deflection of the bow arm bends with the bow arm 10 and absorbs the vibration of the bow arm 10 recovered from bending, so as to reduce the swing deformation amplitude (as shown by the dotted line in the figure, the swing amplitude is relatively reduced compared with the conventional swing amplitude of the bow arm shown in fig. 5), thereby protecting the internal structure of the bow arm 10 from being damaged and effectively prolonging the service life.

Moreover, the present invention can reduce the noise caused by the reciprocating vibration of the pantograph 10 through the vibration protection layer 20, so as to improve the quality of the pantograph 10.

Moreover, since the shock protection layer 20 is more flexible than the arm 10, it can support the covered arm 10 to provide better power storage.

In the following, the features of each component of the present invention are further described in detail, in fig. 1 to 4, the arm 10 has two bending stress surfaces 11, two side surfaces 12 and a pivot hole 13, the two bending stress surfaces 11 are located at two opposite sides and extend along the length direction of the arm 10, the two side surfaces 12 are connected to the two bending stress surfaces 11, the width of the bending stress surface 11 is greater than that of the side surfaces 12, the arm 10 has a pivot hole 13 located near one end, and the pivot hole 13 penetrates through the two side surfaces 12; therefore, when the bending stress surface 11 is stressed and bent by pulling the bow string of the winding provided by the pivot hole 13 and the pivot guide wheel, the bending stress of the bow arm 10 is shared by the bending stress surface 11 with larger width to reduce the deformation amplitude.

Moreover, the shock protection layer 20 includes two bending protection sheets 21 covering the two bending stress surfaces 11 and two lateral protection sheets 22 covering the two lateral surfaces 12, so that the shock protection layer 20 provides an integral covering for the circumference of the arm 10, and can effectively absorb the shock recovered by bending the arm 10 to reduce the swing deformation and protect the internal structure of the arm 10 from being torn.

Moreover, the vibration protection layer 20 includes a thermoplastic elastomer, or the vibration protection layer 20 includes a thermal elastomer, or the vibration protection layer 20 includes a mixture of a thermoplastic elastomer and a thermal elastomer. Wherein the thermoplastic elastomer is any one of or a combination of any two or more of the following: thermoplastic Polyurethanes (TPU), thermoplastic vulcanizates (TPV), thermoplastic polyolefin elastomers (TPO), thermoplastic Rubber elastomers (TPS/TPR), thermoplastic polyester elastomers (TPEE), pure Terephthalic Acid (PTA); the heat-curable elastomer includes natural rubber and silicone rubber.

In the present invention, the vibration protection layer 20 is coupled to the yoke 10 by mounting the yoke 10 on a mold of an injection molding machine and coupling the vibration protection layer 20 to the outer surface of the yoke 10 by injection molding.

Finally, the vibration protection layer 20 of the present invention may also be coated on the outer surface of the bow arm 10 by hot press molding.

As described above, the present invention uses the vibration protection layer 20 to bend with the bow arm 10 with a large deflection, so as to truly overcome the dilemma and the disadvantage that the current bow arm cannot be used durably due to large vibration swing when being bent and restored by stress, and achieve the following advantages:

1. the vibration of the bow arm 10 in bending recovery is effectively absorbed to reduce the swing deformation amplitude, the internal structure of the bow arm 10 is protected from being torn and damaged, and the service life is prolonged.

2. Further reduce the noise that bow arm 10 reciprocating vibration caused to promote the quality of use of bow arm 10.

3. Moreover, the vibration protection layer 20 is bent with a large deflection along with the bow arm 10, so that the bow arm 10 is supported to have a better force storage, thereby further improving the use efficiency.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiment according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A bow arm protection device, comprising:

a bow arm;

2. The device as claimed in claim 1, wherein the arm has two bending force-bearing surfaces located at opposite sides and extending along the length of the arm, two side surfaces connecting the two bending force-bearing surfaces, the bending force-bearing surfaces having a width greater than the width of the side surfaces, and a pivot hole located near one end and penetrating through the two side surfaces.

3. The pantograph arm protection device of claim 2, wherein the shock protection shield comprises two bending protection plates covering the two bending bearing surfaces and two side protection plates covering the two side surfaces.

4. The pantograph arm protection device of claim 1, wherein said shock protection layer comprises a thermoplastic elastomer.

5. The pantograph arm protection device of claim 1, wherein the shock protection layer comprises a thermally curable elastomer.

6. The bow arm protector of claim 1, wherein said shock protection layer comprises a blend of a thermoplastic elastomer and a thermoset elastomer.

7. The device as claimed in claim 1, wherein the vibration protection layer is attached to the arm by mounting the arm on a mold of an injection molding machine, and attaching the vibration protection layer to the outer surface of the arm by injection molding.

8. The pantograph arm protection device of claim 1, wherein the shock protection layer is overmolded onto the outer surface of the pantograph arm.