JP3084266B2 - Free stop hinge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection between a monitor and a main body of a laptop personal computer or a word processor, a connection between a document cover and a main body of a printer or a facsimile, or a small electronic device such as an electronic organizer. The present invention relates to a free-stop hinge which can be used to connect a display unit to a main body and which can be freely opened and closed at any angle.

[0002]

2. Description of the Related Art Conventionally, in this type of free stop hinge, the base of the other bracket is rotatably fitted to a shaft serving as an axis fixed to the base of one bracket, and this rotation is performed by a fleece. A washer-type slide made of oil-impregnated sintered material between the washer that rotates integrally with the shaft that serves as the shaft core and the bracket base on the fitting side to obtain the torque that maintains the top position Fit the components,
The one which has a free stop function by adjusting the torque while caulking the support shaft and tightening the fitting member has been used.

[0003]

In such a conventional structure, when the rotation is repeatedly performed, the sliding member lacks oil and the sliding function becomes defective or the member is damaged. It has been considered that the sliding member is made of a synthetic resin material.

[0004] However, this type of equipment has not been realized in many cases because of the problem of conductivity between the rotating main body and the base body.

[0005] In addition, the conventional free stop hinge relies on a rotating torque caused by crimping pressure of a washer and a sliding member provided at one end in the longitudinal direction of a shaft and a bushing body. In such a case, torque for maintaining the free stop function cannot be obtained, and durability against rotation has become a problem.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and a bush for attaching a rotation support shaft to a shaft core to maintain a free stop function has low friction and has high conductivity. Reinforcement with appropriate elasticity and rigidity is added to the synthetic resin having, and the inner diameter of the bush is slightly smaller than the outer diameter of the shaft core. It is configured as a so-called interference fit forcibly press-fitting.

[0007] That is, the bush in the present invention generates free stop torque between the outer surface of the shaft core and the entire contact surface of the bush inner diameter by the interference fit of the appropriate elasticity and rigidity of the reinforcing material, so that durability against rotation is reduced. In addition to securing sufficient rotation, both ends of the rotation support shaft that are not related to the rotation torque can be made of a free material. Can be secured.

When it is desired to secure conductivity in the bush body itself, conductive material powder is mixed and mixed with the synthetic resin of the bush, and a flange body is integrated at both ends or one end using the material synthetic resin. By molding
The slidability with the bracket insertion part has been improved, and the number of parts has been reduced, making assembly work easier.

Further, in order to secure appropriate elasticity and rigidity of the bush, a metal mesh is incorporated as a core material in the synthetic resin of the bush mixed with the conductive material powder, or a metal plate is attached by being superposed. .

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a bracket supported on the base body, 2 is a bracket supporting the rotating main body, and a shaft core 3 is fixed to an end of the bracket 2 supporting the rotating main body. The shaft core 3 is press-fitted into the mounted bush 4.

The bush 4 incorporates a metal mesh in which wires having appropriate elasticity and rigidity are combined in a lattice shape, or is made of a synthetic resin into which a conductive material powder, for example, graphite or carbon is blended and kneaded. Flange members 4b, 4b are integrally formed at both ends of the cylindrical portion 4a into which the shaft core 3 is inserted, and the flange members 4b, 4b face each other between the washers 8a, 8b which rotate integrally with the shaft core 3. It is fitted.

The washers 8a, 8b and the flange members 4b, 4b of the bush 4 are fixed by caulking or the like while being appropriately pressed. In addition, in order to facilitate the work when the shaft core 3 is press-fitted into the bush 4, a slit 4c may be freely inserted.

With this configuration, a balanced rotational friction force between the washers 8a, 8b and the contact surfaces 4D, 4D of the flange body of the bush 4, and between the shaft core 3 and the inner diameter of the cylindrical portion 4a of the bush 4 is obtained. And slidability are secured, metal mesh of reinforcement,
Conductivity between the brackets 1 and 2 is also ensured via a metal plate or a blended conductive material powder.

The bush 4 is composed of a synthetic resin having PTEF (polytetrafluoroethylene) as a base material, kneaded with graphite and carbon as a conductive material powder, and has a metal mesh 6 as a core material to constitute a basic material. The shaft core 3 was press-fitted into a cylinder formed by roll pressing, drawing, and punching, and then tightly fitted to lower the resistance value, thereby increasing the rotational torque and the electric conductivity.

Further, as another embodiment, a metal plate 7 having appropriate elasticity and rigidity is superposedly attached as a backing material to a synthetic resin material of a bush mixed with a conductive material powder, so that it is robust. Can be enhanced.

When it is necessary to improve the slidability, the cylindrical portion 4a of the bush 4 is extended by using the spacer 5, and the contact area between the shaft core 3 and the inner diameter of the bush 4 is increased. Make the free stop rotation operation more reliable.

As an example, a basic material in which graphite and carbon are kneaded as a conductive material powder into a synthetic resin based on PTEF (polytetrafluoroethylene) and a metal mesh 6 is incorporated as a core material is described by the applicant. As a result of the experiment, measurement results as shown in FIG. 8 were obtained.

It should be noted that, for equipment that does not require electrical conductivity or equipment that does not require such a large torque strength, there is no need to incorporate a metal mesh into the material of the bush 4 or knead the conductive material powder. Of course, it is free to provide a body or not.

According to the above construction, the present invention provides a sliding function by the occurrence of insufficient sliding in the rotating direction while ensuring the electrical conduction between the bracket supporting the rotating main body and the bracket mounted on the base body. The defect was eliminated to prevent damage to the members.

The rotation torque can be set to a predetermined value by adjusting the amount of tight fit between the shaft core 3 and the bush 4.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is an overall perspective view showing an example of a free stop hinge applied to a notebook computer.

FIG. 2 is a front view showing an example of a free stop hinge which is also a small electronic device and rotates in parallel.

FIG. 3 is an enlarged perspective view showing an example of a bush similarly provided with a flange body.

FIG. 4 is an enlarged side view of a main part showing a relationship between the bush, the shaft core, and the bracket, similarly showing a cross section of a required part of the bush and the bracket.

FIG. 5 is an enlarged side view of a main part in a cross section of a required part showing a relationship between a bush, a shaft core, and a bracket when a spacer is applied to the bush and the bracket.

FIG. 6 is an enlarged vertical sectional side view of a basic material in which a conductive material powder is kneaded into a synthetic resin and a metal mesh is incorporated as a core material.

FIG. 7 is an enlarged vertical cross-sectional side view of a base material in which a metal plate is superposed and attached as a backing material to a material synthetic resin mixed with a conductive material powder.

FIG. 8 is a graph showing the relationship between a rotational torque and a resistance value in an experiment on the number of sliding times of a specific material

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bracket which supports a rotating main body 2 Bracket supported on a base body 3 Shaft core 4 Bush 4a Cylindrical part of a bush 4b Flange body of a bush 4c Splitting of a bush 4d Contact surface of a washer of a bush flange body 5 Spacer 6 Metal mesh 7 Metal Plate 8a, 8b Washer A material synthetic resin layer

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-9-331181 (JP, A) JP-A-60-181147 (JP, A) JP-A-5-71434 (JP, U) JP-A-63 49018 (JP, U) JP-A 3-54476 (JP, U) JP-A 61-81060 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16C 11/04-11 /Ten

Claims (3)

(57) [Claims] A bush for mounting a rotation support shaft interposed between a bracket supporting a rotation main body and a bracket mounted on a base body to a shaft core is made of a synthetic resin material and a conductive material powder. And a synthetic resin with a built-in metal mesh with appropriate elasticity and rigidity.The inner diameter of the bush is made smaller than the outer diameter of the shaft core, and the larger diameter shaft core is made smaller. A free-stop hinge characterized in that it is configured as an interference fit that is forcibly press-fitted into the bush. 2. A bush mounted on a shaft core is formed by mixing a conductive material powder into a material synthetic resin and superimposing a metal plate having appropriate elasticity and rigidity as a reinforcing material of the synthetic resin. 2. A free stop hinge according to claim 1, wherein the free stop hinge is configured. 3. The free stop hinge according to claim 1, wherein a cut is provided on one side of the bush attached to the shaft core.