JPH05184695A - Driving appliance - Google Patents

Abstract

PURPOSE: To provide a hitting tool having an impact absorptivity by interposing a vibration absorbing material between formed parts having complementary shapes in a part containing a hitting part and a part containing handle parts and joining them together. CONSTITUTION: In the hitting tool provided with handle parts 1, 4 and a hitting part, the hitting tool is set to a discontinuous one consists of two parts, one part contains the hitting part, the other part contains handle parts 1, 4 or a part of them, and two parts have formed parts 2, 3, 5, 6 having complementary shapes. The formed parts 2, 3, 5, 6 are so assembled as to be axially stacked with each other by a vibration absorber material 7 which is joined between them, the two parts are connected to each other so as not to be separated from each other, and the vibration absorbing material mechanically isolates one part from the other part. Two finger parts engaged with each other in being assembled are provided in each of the complementary-shaped formation parts 2, 3, 5, 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hand-held striking tool having a vibration damping element that insulates a portion held from a portion used for striking.

Although the present invention will be described with particular reference to a competition racket or cricket bat, the present invention should not be construed as limited to a competition racket or cricket bat, as the invention may include, for example, hockey sticks, golf. Clubs, baseball bats, hurling sticks,
It is equally applicable to other strike tools such as polo sticks, croquet mallets and batons, batons and clubs.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a striking tool having a handle portion and a striking portion, the striking tool being a two-part discontinuous tool, while Part includes the striking part, the other part includes the handle part or a part thereof, and the two parts have a forming part having a complementary shape. By vibrating cushioning material interposed between the parts and joined to the forming part, they are combined in an axially overlapping manner, whereby the two parts are inseparably connected to each other and the vibration Buffer material
Mechanically insulate one part from the other.

The forming portion having a complementary shape is preferably formed so as to have a cross section that is substantially the same as the rest of the handle portion. Examples of formations having complementary shapes are (i) a few, three or more fingers that engage each other when assembled, (ii) cones (cones) and sockets, and (iii) pins and sockets. is there.

Axial overlap of the complementary shaped formations means that the opposing surfaces extend in planes which are at an angle to each other, which planes are in the preferred embodiment substantially perpendicular to each other. is there. If the forming part having a complementary shape has almost the same shape but is rotated by 90 ° when finally assembled, it has a forming part 1
It is possible and convenient to mold a piece-shaped hollow handle part, cut the forming part, rotate one of the handle parts by 90 ° and combine the forming parts with complementary shapes. The assembly must be properly jigged to align the elements before injecting the vibration dampening material to fill the gaps between the complementary shaped formations.
The vibration damping material can be a thermosetting material or a thermoplastic material, and is particularly preferably an injectable material such as polyurethane resin. Suitable materials are based on elastomeric materials that have been combined to produce the properties of vibration damping materials.

The preferred polyurethane resin is an injectable thermoset elastomeric material, especially a two-part curable polyurethane in the form of being mixed with a liquid and therefore easily injectable and then curable in place. Is. Such materials are available from Compounding Ingredients Limited (Compoundin).
g Ingredients Limited) to Silcast 101 (Silcure B:
(Curing by adding CILCURE B)). Silcast and Silcure are registered trademarks. (The hardness and elasticity of the vibration damping material are measured according to the British Standard (BS) test, which is internationally available and well known to those skilled in the art). Such materials are those that have desirable properties for the vibration damping material of the present invention, and S. 2782 Part 3
B. has a hardness greater than 60 ° in Shore A as measured according to "Durometer Depression Hardness (Shore A)". S. It has an elasticity of less than 20% as measured according to "Bounce Elasticity" of Method B of 903 Part A8. The vibration damping material is B.I. S. 278
70 ° at Shore A when measured according to “Durometer Depression Hardness (Shore A)” in Part 2, 2
More preferably, it has a hardness in the range of .about.95.degree. S. It is preferably in the range of 5% to 15% as measured according to "Bounce Elasticity" of Method B of 903 Part A8.

The vibration damping material preferably self-bonds to the complementary shaped formation of the two parts of the striking tool, ie does not require a separate adhesive. The two-part curable polyurethane described above has this desirable property.

The handle portion preferably has a single discontinuity according to the invention, the handle portion itself being able to be joined to the striking part rather than being integral with the striking part.

The present invention is particularly used in cricket bats, but it is important that the handle is light and strong, and that the striking portion (ie, the blade) can absorb at least a part of the impact received when striking the cricket ball. is there. The portion including the handle portion is designed such that the forming portion is generally in a plane orthogonal to the surface of the striking portion (blade),
Therefore, it is preferable that the forming portion of the portion including the blade is in a plane substantially parallel to the surface of the blade. This configuration improves the shock absorption of the final product.

Between the finger parts of said one part, especially when the forming part of one part comprises two or more finger parts which mate with corresponding two or more finger parts of the other part. It is preferred to provide a web, which reduces bending of the formations when struck with a tool and thus reduces strain acting on the joint between the formations having complementary shapes. In order to take advantage of this potential improvement, a web needs to be provided between the formations so that the free end of the web approaches the strike when using the strike tool. ..

A preferred material for the handle portion is a fiber such as carbon or glass impregnated with a thermosetting or thermoplastic resin. Such a composition is hollow and therefore can be molded to obtain a lightweight and rigid handle. Especially in the case of hitting tools which are subject to a great impact in use, such as for example cricket bats or hockey sticks, the fibers are, for example, aramid.
d) A material having a large impact absorption property such as fiber or polyethylene fiber can be used.

[0012]

The present invention will now be described, by way of example only, with reference to the drawings.

Referring to FIGS. 1, 2, 3, and 4,
The handle portion includes forming portions (finger portions) 2 and 3. The handle portion 1 is hollow, and as is well known to those skilled in the art of forming hollow articles from polymeric materials, it is a woven or "warp sheet".
et) "in the form of a resin-impregnated fiber wrapped around an expansion tube and then molded under the action of heat and internal pressure. Alternatively, the expansion tube can be replaced by a plastic material that can expand under the action of heat and generate the required internal solidification pressure. The alignment of the fibers of the wrapping material is selected to produce strength in the handle that has the desired orientation, and the type of fiber is the impact provided by the vibration dampening material that is interposed between the complementary shaped formations. It can be selected to yield improved desirable shock absorption properties that are greater than absorbency. Such fibers having good shock absorption properties include glass fibers, aramid fibers and polyethylene fibers, and such fibers may be used in combination with each other or with carbon fibers to obtain desirable properties. Obtainable. The other handle portion 4 is also formed similarly to the handle portion 1 and has forming portions 5 and 6 (behind the forming portion 3 in FIG. 3). Forming part (finger part) having a complementary shape of these two handle parts
And are meshed with each other, and the vibration damping material 7 is injected between the forming portions. When the vibration damping material 7 solidifies, it joins the forming parts. Therefore, both handle parts are mechanically insulated but firmly bonded by the vibration absorbing material. Such an assembly may be used, for example, as part of a competition racket.

Referring to FIGS. 5-8, this structure is based on a principle very similar to that shown in FIGS. 1-4, but with a complementary shaped forming portion each consisting of three fingers. We are using.

With reference to FIGS. 9 and 10, a cricket bat including another embodiment of the present invention comprises a handle portion 8 having formations 9, 10, said formation being provided by a vibration damping material 11. It is associated with the forming parts 12, 13 having the complementary shape of the other handle part 14. The handle assembly is hollow and is a composite of solidified resin impregnated fibers and is joined to a wooden blade 15.

The principal direction in which the cricket ball strikes is indicated by arrow F in FIG. In this configuration,
The forming portions 9, 10 of the handle portion 8 are in a plane orthogonal to the surface of the bat, and therefore the shock absorption is improved as compared to the configuration in which the forming portions 9, 10 are in a plane parallel to the surface of the bat. ..

Referring to FIG. 11, the handle portion 16 is
It has finger portions 17, 18 joined by an integral web 19 over a portion of each length. Referring to FIG. 12, the handle portion 20 includes finger portions 21 and 22 (the finger portion 22 is behind the finger portion 21). By combining the forming portions (finger portions) having the complementary shapes of the two handle portions shown in FIGS. 11 and 12,
They are intermeshed with each other as shown in FIG. The vibration damping material 23 is injected between the forming parts and then solidified to join the forming parts as shown in FIG. The arrow F indicates the direction of the force that the striking device receives during use, whether it is a cricket bat or a tennis racket. Therefore,
The web 19 resists the opening of the fingers 17, 18 that would otherwise occur in use without this configuration.

[Brief description of drawings]

FIG. 1 is a side view showing a handle portion having two finger portions according to an embodiment of the present invention.

2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is a side elevational view showing the handle portion of FIG. 1 in combination with and joined to another handle portion having a complementary shape.

4 is a cross-sectional view taken along the line BB of FIG.

FIG. 5 is a side elevational view of a handle portion having three finger portions according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view taken along the line CC of FIG.

FIG. 7 is a side elevational view showing the handle portion of FIG. 5 in combination with and joined to another handle portion having a complementary shape.

8 is a cross-sectional view taken along the line DD of FIG.

FIG. 9 is a front view showing a cricket bat according to another embodiment of the present invention.

10 is a cross-sectional view taken along the line EE of FIG.

FIG. 11 is a side elevational view showing a handle portion according to yet another embodiment of the present invention having two finger portions partially joined by a web.

12 is a side elevational view showing a striking part having a forming part having a shape complementary to the handle part of FIG. 11. FIG.

13 is a side elevational view showing the handle portion of FIG. 11 in combination with the striking portion of FIG.

14 is a side elevational view showing the handle portion of FIG. 11 joined to the striking portion of FIG.

[Explanation of symbols]

1, 4 Handle part 2, 3 Forming part (finger part) 5, 6 Forming part 7 Vibration damping material 15 Blade

Claims (13)

[Claims] 1. A striking tool including a handle portion and a striking portion, wherein the striking tool is a discontinuous body made up of two parts, one portion including the striking portion, and the other portion including the handle. Part or part thereof, and
One part has a forming part having a complementary shape,
The forming parts are combined in an axially overlapping manner by a vibration damping material interposed between the forming parts and joined to the forming parts, so that the two parts cannot be separated. Impact tool, wherein the vibration damping material mechanically insulates one part from the other part. 2. The striking tool according to claim 1, wherein each of the forming portions having the complementary shape includes at least two finger portions which are engaged with each other when combined. 3. The striking tool according to claim 1, wherein the vibration damping material is a thermosetting material. 4. The striking tool according to claim 1, wherein the vibration damping material is a pourable material. 5. The striking tool according to claim 1, wherein the vibration damping material is an elastomer. 6. The impact tool according to claim 1, wherein the vibration damping material includes polyurethane. 7. The striking tool according to claim 1, wherein the vibration damping material is B.I. S. 2782 Part 3 has a hardness greater than 60 ° in Shore A as measured according to "Durometer Depression Hardness (Shore A)", and S. Method B of 903 Part A8
A percussion tool having an elasticity of less than 20% when measured according to the "rebound elasticity" of. 8. The impact tool of claim 7, wherein the vibration damping material is B.I. S. A striking tool having a hardness in the range of 70 ° to 95 ° in Shore A when measured according to “Durometer-Depressed Hardness (Shore A)” in 2782 Part 3. 9. The impact tool according to claim 7 or 8, wherein the vibration damping material is a B.I. S. Method B of 903 Part A8
5% to 1 when measured according to “Rebound Elasticity”
A percussion tool having elasticity in the range of 5%. 10. The impact tool of claim 1, 2, 3, 4, 5, 6, 8 or 9 comprising a thermosetting polyurethane elastomer injectable with the vibration damping material, the elastomer comprising: S. 2782 Part 3 has a hardness of 70 ° to 95 ° at Shore A as measured according to "Durometer Depression Hardness (Shore A)", and
S. A percussion tool having an elasticity in the range of 5% to 15% as measured according to "Bounce Elasticity" of Method B of 903 Part A8. 11. The striking tool according to any one of claims 1 to 10, wherein the striking tool comprises two parts each having a forming portion connected by a vibration damping material and having a complementary shape. Hitting tool. 12. The impact tool of any of claims 1-11, wherein the vibration dampening material self-bonds to the complementary shaped formation without the need for a separate adhesive. A hitting tool to do. 13. A striking tool according to any one of claims 1 to 12, wherein each of the complementary shaped forming portions comprises at least two finger portions which engage with each other when combined, the at least two finger portions. One of the forming portions having a complementary shape of 1. has a web that partially connects the finger portions along the length thereof.