JPH052301Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of pliers suitable for clamping work that requires electrical insulation, heat insulation, corrosion resistance, abrasion resistance, etc.

[Conventional technology]

BACKGROUND ART Clamping tools such as pliers, pliers, and pliers have been widely used for cutting wire rods and clamping objects. These clamping tools (hereinafter referred to as pliers) are mainly made of steel, so they have high toughness and mechanical strength, but they are also conductive and electrically heated, and are resistant to corrosion by acids, alkalis, and corrosive gases. Because of the large degree of damage caused to the tool, it was unsuitable as a tool for working with live wires on current-carrying circuits or in places where it comes into contact with hot objects or corrosive objects. Therefore, for example, if metal pliers are used to work on live wires such as power transmission lines or communication lines, there is a risk of electric shock or confusion with the signals of the communication lines due to noise, etc., and these should be avoided. Pliers with a structure in which a tube made of synthetic resin is shown in the grip part of the pliers especially for the purpose of electrical insulation have come to be used in many cases.

However, even with pliers that have synthetic resin tubes covered, after long-term use, some parts of the coating may become damaged or pinholes may develop, exposing the metal. many,
If you were not aware of this and used it for live wire work, there was a great risk of causing an irreversible accident.

In order to overcome the above-mentioned disadvantages of steel pliers with their electrical conductivity, heat conductivity, and corrosive properties, there are pliers in which the part that clamps an object is made of a ceramic body. For example, there are Utility Model 60-167669 and Utility Model 61-50662. It has been proposed that these have a pair of clamping parts made of ceramic, joined to a metal main body by convex-concave fitting, and fixed with an adhesive.

[Problem that the invention attempts to solve]

However, when it comes to holding parts made of ceramic, which has properties such as insulation, heat insulation, and corrosion resistance, it has a tapered shape and has lower bending strength and toughness than steel. Ceramic material is slightly inferior to ceramic material, so if a force exceeding a certain strength limit is applied to pliers whose gripping parts are made of ceramic material, the tapered ceramic gripping part may break. , cracked at the corner,
Although it has the above-mentioned excellent properties, it has problems in practical use, such as being prone to chipping.

[Means for solving problems]

In order to solve the above problems, at least the part of the first clamping part and the second clamping part that clamps the object has electrical insulation properties, has heat insulation properties, corrosion resistance, corrosion resistance, wear resistance, etc., and has a relatively large size. It is made of a ceramic material such as zirconia (ZrO ₂ ) having toughness, and thin-walled parts are formed in the vicinity of the hinges of the first clamping part and the second clamping part and/or in the vicinity of the hinge part of the grip part in order to achieve elastic deformation. It's pliers.

〔Example〕

Hereinafter, embodiments of the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows a side view of the pliers 1 according to the present invention, and the grip members 2 and 3 are connected to each other by a hinge H, and the tips of the first clamping part 2a and the second clamping part 3a are made of ceramic. The tip members 2c and 3c are fixed by adhesive, screwing, groove fitting, or the like.

Further, thin-walled portions 2b and 3b each having a semicircular shape are formed in the portions of the first and second holding portions 2a and 3a close to the hinge portion H, respectively.

In this way, the first thin portions 2b and 3b are made of steel,
The second clamping portions 2a, 3a are formed so that they can be easily elastically deformed.

Therefore, the tip members 2c, 3c made of Saramikku
However, based on, for example, strongly gripping the grips 2 and 3 of the object 4, the object 4 can be moved to the tip members 2c, 2c, 3, etc.
When a pressing force (clamping force) exceeding the allowable strength limit of the tip members 2c, 3c is applied, the thin parts 2b, 3b of the first and second clamping members 2a, 3a, to which the tip members 2c, 3c are fixed, By elastically deforming as shown by the dotted line, the pressing force exceeding the limit is absorbed and is prevented from acting on the clamped object 4.

Furthermore, FIG. 2 shows another embodiment according to the present invention, in which a thin wall portion 2 is provided near the hinge portion H of each grip portion 2, 3.
By forming d and 3d, the grip portion 2,
Even if a strong gripping force is applied to the tip members 2c, 3c, and there is a possibility that a force exceeding the allowable limit will be applied to the tip members 2c, 3c, the gripping portions 2, 3 themselves will elastically deform, and the gripping force beyond that will be applied to the ceramic tips. Members 2c, 3c
This prevents cracking and chipping from occurring. In addition, in the embodiment shown in FIG. 2, since the thin parts 2d and 3d are formed in the grip parts 2 and 3, the pliers 1' in which the first and second grip parts 2a and 3a are provided with the blade parts B are formed. can be configured.

[Effect of idea]

As described above, according to the pliers of the present invention, at least the abutting part that clamps an object, that is, the tip member is made of ceramic, and the vicinity of the hinge part of the first and second clamping parts, the hinge part of each grip part Since a thin wall is formed in the vicinity, a clamping force that exceeds the allowable limit will not be applied to the ceramic body, preventing it from cracking, chipping, or cracking.
Alternatively, it is possible to prevent the joint portion (connection portion with the metal material) from coming off.

As a result, the long lifespan of the pliers is made up of a ceramic clamping member that is insulating, non-static, non-magnetic, wear-resistant, corrosion-resistant, heat-insulating, and non-adherent to solder and silver solder. It is possible to aim for

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are both side views of the pliers according to the embodiment of the present invention. 1, 1'... pliers, 2, 3... grip, 2c,
3c... Tip member, B... Blade portion, H... Hinge portion.

Claims (1)

[Scope of utility model registration request] At least the parts of the first clamping part and the second clamping member, each of which is connected to the grip part, that clamps an object are made of ceramic material, and the vicinity of the hinge part of the first clamping part and the second clamping part and/or the grip part A pair of pliers characterized in that a thin wall portion is formed near the hinge portion of the pliers.