JPH10249748A - Synthetic resin spanner and method of manufacturing the same - Google Patents

Abstract

(57) [Summary] [Spanner] Spanner J is not larger than the size specified in wrench JIS, has excellent electrical insulation, is resistant to rust, is light and strong, and does not damage the parts to be tightened.
Provided is a spanner suitable for light work, capable of withstanding near the bending moment value of the strength test described in IS. SOLUTION: A substantially U-shaped insert member 8 made of steel or ceramic is formed along an inner peripheral edge of an opening 4 formed in a substantially U-shape.
A synthetic resin head 12 having embedded therein and a synthetic resin grip 18 connected to the head 12 constitute a spanner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spanner as one of power tools and a method for manufacturing the same, and more specifically, is suitable for light work and has sufficient strength for light work.
The present invention relates to a synthetic resin spanner that is light, can have high insulation if necessary, and is hardly corroded, and a method of manufacturing the same.

[0002]

2. Description of the Related Art A metal wrench is often used for tightening and loosening bolts and nuts. The wrench has electrical conductivity because it is mainly made of metal as specified in JIS B-4630-1986 (hereinafter abbreviated as JIS wrench). Therefore, it may not be used depending on the work content.

On the other hand, an insulating wrench is known in which the outer surface of the above-mentioned metal wrench is covered with an insulating material. However, this wrench is larger than the size specified in the spanner JIS by the coating thickness of the insulating material. Therefore, there is a problem in workability.

[0004] A metal spanner has also been used for light work such as tightening or loosening a decorative nut, light metal, or synthetic resin parts. There are problems such as damage.

Japanese Utility Model Application Laid-Open No. 4-83572 (Japanese Utility Model Application No. 2-12)
No. 5192) discloses a non-conductive resin spanner for preventing a flaw or damage on a side that can be tightened, and this wrench has a diameter of a joint portion between a grip portion and a tightening portion. In actual use, the width across flats that hold the bolts and the like may be deformed, and the maximum bending moment may be insufficient, which may not be suitable for practical use.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric insulating material which cannot be solved by the above-mentioned prior art and which does not become larger than the size specified in the spanner JIS. Excellent in rust resistance, light, durable, with little damage to the parts to be fastened, and can withstand up to the strength test value of spanner JIS.
An object of the present invention is to provide a spanner having good workability, particularly suitable for light work.

[0007]

In order to achieve the above object, the present invention provides: [1] A substantially U-shaped insert member is buried along the inner peripheral edge of a substantially U-shaped opening. A synthetic resin spanner having a mouth, and a synthetic resin spanner characterized by being composed of a synthetic resin grip formed by connecting the head to at least one end thereof,
[2] The insert member has a reinforcing portion, [3] The synthetic resin is a synthetic resin reinforced with glass fiber, boron fiber, carbon fiber, or alumina fiber, [4] Insert member [5] that the insert member is made of a non-conductive ceramic.

The present invention also provides [6] a synthetic resin head having a substantially U-shaped opening and having a substantially U-shaped insert member embedded along the inner peripheral edge of the opening, and at least one end of the synthetic resin head. And a synthetic resin wrench comprising a synthetic resin grip portion formed by connecting the wrench and the synthetic resin wrench by an insert molding method.

In the present invention, the above problem is caused by attaching the insert member having the same strength and hardness as steel (hereinafter, abbreviated as “insert member”) to the spanner opening at the mouth of the spanner. Is to obtain a spanner that solves the problem.

Hereinafter, the present invention will be described in detail.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a synthetic resin spanner incorporating an insert member of the present invention.

In FIG. 1, reference numeral 2 denotes a main body having an opening 4 formed in a substantially U-shape, which is made of synthetic resin. A groove 6 is formed along the inner peripheral edge of the substantially U-shaped opening 4 of the head main body 2.
A letter-shaped insert member 8 is embedded. The head main body 2 and the insert member 8 constitute a head 12 having a mouth portion 10.

One surface 14 and the other surface 16 of the insert member 8 which oppose each other in the width direction of the mouth portion 10 are formed parallel to each other, and the width S is a two-plane width. S0 is the outer width of the insert member 8, S1 is the outer width of the head 12, T is the thickness of the head 12, and t is the thickness of the insert member 8.

One end of a grip portion 18 made of synthetic resin is integrally connected to the head 12 at a side substantially opposite to the mouth portion 10, thereby forming a spanner. Note that L is a spanner length.

In the wrench having the above construction, a bolt or a nut is sandwiched between the mouth portions 10 and the grip portion 1 is held around the bolt or the nut.
These can be tightened or loosened by rotating 8.

As the synthetic resin, polypropylene,
General-purpose resins such as polyethylene and polystyrene, and various soft resins can be used. Further, a thermoplastic resin such as a polyamide resin, a polycarbonate resin, and a polyethylene terephthalate resin, and a thermosetting resin such as a polyester resin can also be exemplified.

Of these synthetic resins, polyamide resins are particularly preferred for reasons of moldability, strength, oil resistance and the like.

The synthetic resin may be a resin reinforced with a fiber such as glass fiber, boron fiber, alumina fiber, carbon fiber or the like as a reinforcing material. For example, glass fiber reinforced polypropylene, glass fiber reinforced polyamide resin, glass fiber reinforced polycarbonate resin, glass fiber reinforced polyester resin, and the like.When these reinforced resins are used, since the strength is large, the maximum bending is possible. A spanner with a larger moment can be obtained.
Alternatively, in the case of the same shape, the insert member can be made smaller. When using a polypropylene resin reinforced with glass fibers, the glass fibers are supplied in the form of roving, even long fiber pellets,
Compound pellets cut into 1.5 to 9 mm and made by kneading chopped strands may be used, and the amount of the reinforcing material mixed can be appropriately selected according to the shape of the insert member.

Although the carbon fiber is conductive, it can be made non-conductive by selecting the amount of the carbon fiber. In the case of a spanner used for an application which does not always require non-conductivity, the carbon fiber is used. Can also be used as a reinforcing material.

The insert member is a member that comes into direct contact with a bolt, a nut, or the like, and is a portion to which a bending moment of a wrench is applied.

The material of the insert member is preferably a metal having an HRC hardness of 45 or more, such as a pre-hardened steel, a quenched and tempered steel, a precipitation hardened steel, and a corrosion resistant steel, in terms of hardness and strength.
Furthermore, a new material having a strength equal to or close to that of a metal such as ceramics can be used. In this case, the weight can be reduced and the better insulation can be improved by selecting the material. Examples of these new materials include alumina-based and silicon carbide-based ceramics.

As a method for manufacturing a wrench, a synthetic resin wrench main body in which a groove 6 is formed along the U-shaped opening 4 of the head main body 2 in advance, and an insert member 8 is fitted thereto. However, it is preferable to adopt an insert molding method in which an insert member is previously mounted in a mold and a resin is injected into the mold.

FIG. 2 shows another example of the spanner of the present invention. In this example, heads 24 and 26 are integrally formed at both ends of the grip portion 22, respectively. Head 24,
26, steel insert members 28 and 30 are embedded and attached to the same grooves (not shown) as described above. These insert members 28 and 30 are formed with substantially rectangular reinforcing portions 40 and 42 protruding to the side opposite to the mouth portions 36 and 38 of the substantially U-shaped insert member main portions 32 and 34, and are formed as a whole substantially Y-shaped. It is shaped like a letter. Reinforcing part 4
Although the length of each of 0 and 42 is not particularly limited, it is preferable that the reinforcing portions 40 and 42 do not contact each other in order to ensure insulation properties. , Especially 1/3 of the length of the grip 22
It is preferable to set the degree.

The other configuration is the same as that of the above-described example, and the description is omitted.

In this example, since the reinforcing members 40 and 42 are provided on the insert member, the grip portion 22 is provided.
The rigidity between the head and the heads 24 and 26 is increased, so that the tightening force applied to the grip portion can be reliably transmitted to the head when the bolt or the like is tightened or loosened.

Further, since the insert members 28 and 30 are independent and do not contact each other, there is no electrical conductivity, and therefore, the insulation of the spanner is reliably maintained.

If the electrical insulation is not a problem, the insert members 28 and 30 may be formed integrally instead of being formed as independent structures. Alternatively, the insert member may be configured to be resin-coated on an insert member whose other dimensions are reduced by about 2 mm.
The shape of the wrench may be either a one-sided wrench or a two-sided wrench, and can also be applied to glasses and boxes.

FIG. 4 and Table 3 show the shape, dimensions, and the like of a wrench-type wrench described in JIS Spanner as a conventional wrench. FIG. 3 and Table 2 show the shape, dimensions, and the like of a round spanner described in the spanner JIS as a conventional spanner.

Hereinafter, the present invention will be described in detail with reference to examples.

[0030]

【Example】

Examples 1 to 9 Using insert members having dimensions shown in Table 1, resin insert wrench with insert members having dimensions shown in Table 1 were manufactured. FIG. 1 shows the shape. The material of the insert member was SKD61 having an HRC hardness of 50, and was manufactured by an insert molding method using a polyamide 66 resin reinforced with 42% by weight of long fiber glass as a synthetic resin. The molding conditions themselves are known to those skilled in the art.

The dimensions of the insert member and the dimensions of the insert-molded resin wrench (product of the present invention) shown in Table 1 are described below.

That is, the dimension S1 of the insert member is as shown in FIG.
And the S0 dimension of the JIS filing spanner shown in Table 3 minus 2 to 8 mm.

Also, a molded resin spanner (product of the present invention)
Is between the S1 size of the file-type wrench shown in FIG. 4 and Table 3 and the S1 size of the round wrench shown in FIG. 3 and Table 2.

The thickness T of the resin spanner (product of the present invention)
The dimensions are between the T-dimensions of the spear wrench shown in FIGS. 4 and 3 and the T-dimensions of the round wrench shown in FIGS.

Further, the t-dimension of the insert member is smaller than the T-dimension of the spear type wrench shown in FIG. 4 and Table 3 by 1 to 5 mm.

The shape and dimensions described above are preferable because they have little practical inconvenience.

Table 1 shows the results of measuring the maximum bending moment (strength) and weight of the resin wrench of the present invention thus manufactured.

[0038]

[Table 1]

[0039]

[Table 2]

[0040]

[Table 3] Comparative Examples 1 to 13 In order to compare the performance with the product of the present invention, spanners having the shapes and dimensions shown in FIG. The synthetic resin used for manufacturing this spanner was the same synthetic resin as the spanners of Examples 1 to 9. Note that no insert member was used for this spanner.

[0041]

[Table 4] Table 4 shows the maximum bending moment (strength) of the obtained spanner.
showed that. Comparative Examples 2, 4, 6, 8 (Nominal dimensions 13, 14, 17, 1
The wrench 9) is similar in size and shape to the round wrench described in JIS shown in FIG. However, as shown in Table 4, the maximum bending moment value of these wrench is the practical bending moment value (tightening torque value) as a wrench.
Do not have.

Comparative Examples 3, 5, 7, and 9 (nominal size 1
3, 14, 17, 19), an attempt was made to increase the S1 dimension to increase the maximum bending moment value from the dimension of the round spanner described in JIS. However, as shown in Table 4, the maximum bending moment could only be increased by about 50%. The reason that the improvement in the maximum bending moment at this time was small was that the width across flats was permanently deformed and the bolts slipped during tightening. In this case, it cannot be tightened again with the same bending moment. Therefore, it can be understood that a sufficient bending moment value cannot be obtained unless the strength of the width across flat portion is increased to prevent permanent deformation even if the joint portion between the grip portion and the head is simply increased.

The difference between the resin spanner of the comparative example not using the insert member and the dimensions and shape of the spanner described in JIS is mainly that the maximum outer width S1 and the thickness T are the same as those of the comparative example. Is in the bigger point. Since the smaller the S1 dimension and the T dimension are, the smaller the area is, the better the work is in the narrow portion. Therefore, it is clear that the resin wrench of the comparative example without using the insert member has difficulty in workability.

For reference, the standard tightening torque (bending moment) according to the bolt strength classification and the spanner JI
Table 5 shows the bending moment of the strength test described in S.

[0045]

[Table 5] * Published by Tokyo Tackle Screw Union: Posted from the screw general catalog

[0046]

According to the present invention, the spanner body is formed of a synthetic resin, and a substantially U-shaped insert member is embedded in the opening for holding a bolt or the like. To tighten bolts,
When loosened, it is difficult to damage or damage the product to be tightened. Further, since the insert member embedded in the mouth has high strength, it is not easily deformed, and therefore the maximum bending moment is extremely high. Furthermore, since it is formed of insulating synthetic resin except for the insert member, it is non-conductive,
It has the features that it is hardly corroded and can be manufactured to a size within the dimensions specified in the spanner JIS.

[Brief description of the drawings]

FIG. 1 shows an example of a spanner of the present invention, (a) is a plan view,
(B) is a side view.

FIG. 2 is a plan view showing another example of the spanner of the present invention.

FIG. 3 shows a round one-sided wrench described in JIS wrench.
(A) is a plan view and (b) is a side view.

FIG. 4 shows a wrench-type single-ended wrench described in JIS wrench.
(A) is a plan view and (b) is a side view.

5A and 5B show a one-sided wrench of a comparative product of the present invention, wherein FIG. 5A is a plan view and FIG. 5B is a side view.

[Explanation of symbols]

 2 Main body 4 Opening 6 Groove 8 Insert member 10 Mouth 12 Head 14 One surface 16 Other surface 18 Grip portion 40, 42 Reinforcement portion

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor: Tatsumasa Tamate 3-11-15 Nihonmatsu, Sagamihara City, Kanagawa Prefecture

Claims (6)

[Claims] 1. A synthetic resin head having a mouth formed by embedding a substantially U-shaped insert member along an inner peripheral edge of an opening formed in a substantially U shape, and the head being provided at least at one end thereof. A synthetic resin wrench, comprising a synthetic resin grip portion formed by connecting the two. 2. The synthetic resin spanner according to claim 1, wherein the insert member has a reinforcing portion. 3. The synthetic resin comprises glass fiber, boron fiber,
The synthetic resin spanner according to claim 1, wherein the spanner is a synthetic resin reinforced with carbon fiber or alumina fiber. 4. The synthetic resin spanner according to claim 1, wherein the insert member is made of metal. 5. The synthetic resin spanner according to claim 1, wherein the insert member is made of a non-conductive ceramic. 6. A synthetic resin head having a substantially U-shaped opening and having a substantially U-shaped insert member embedded along an inner peripheral edge of the opening, and the head being connected to at least one end thereof. A method of manufacturing a synthetic resin spanner, comprising manufacturing a synthetic resin spanner including a synthetic resin grip portion by an insert molding method.