JP2000145757A - Free stop hinge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure smooth sliding performance, to shorten the difference between the dynamic friction coefficient and the static friction coefficient in opening and closing and to secure conductivity between a turning body and a base body by using a material formed by kneading conductive powder to synthetic resin taking PTEF(polytetrafluoroethylene) as a base material for the slide surface. SOLUTION: Washers 4, 4 are constituted by taking metallic plates, metallic meshes of a material formed by kneading graphite, carbon and carbon fibers as conductive powder to synthetic resin taking PTEF as a base material, as reinforcing materials or core materials. The washers are fitted to a support shaft 3 by pinching the panel ends of a bracket 2 from both sides, and a screw nut 7 is fixed after the panel ends of the bracket 2 and the contact surfaces of the washers 4 are adjusted in torque by an external thread 32 and the screw nut 7. Accordingly, balanced turning frictional force and sliding performance between the washers 4, 4 and the panel end contact surfaces of the bracket 2 are secured, and conductivity of the reinforcing material between the brackets 1, 2 is secured through conductive powder.

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, a free stop hinge of this type has a base portion of another bracket rotatably fitted to a shaft fixed to the base portion of one bracket and serving as a support shaft, and this rotation is performed by a fleece. A washer made of oil-impregnated sintered material between a metal washer that rotates integrally with the shaft that serves as the support shaft and the bracket base on the mating side to obtain torque that maintains the top position. A type having a free stop function by adjusting a torque while fitting a mold sliding member, caulking a support shaft and tightening the fitting member has been used.

[0003]

In such a conventional structure, the difference between the coefficient of dynamic friction at the time of opening and closing and the coefficient of static friction at the time of locking of the rotating main body is large, so that a backlash in which vibration occurs at the time of stoppage occurs, There is a problem that the accuracy of the opening angle is difficult to obtain.

Further, if the rotation is repeatedly performed, the sliding member lacks oil and the sliding function becomes defective or the member is damaged. Therefore, it is considered that the washer-type sliding member is made of a synthetic resin material. I have been.

[0005] 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.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and has a rotation support shaft interposed between a bracket for supporting a rotation main body and a bracket mounted on a base body. With the shaft fixed to the base of one bracket, and the base of the other bracket
The shaft is rotatably fitted to the shaft via a washer made of a material obtained by kneading a conductive material powder into a synthetic resin based on EF (polytetrafluoroethylene), and the fitting end of the support shaft is screwed into the shaft. The torque adjustment is performed while tightening the fitting member with a nut or a caulking.

That is, the washer in the present invention is:
By using a material in which conductive material powder is kneaded in a synthetic resin based on PTEF (polytetrafluoroethylene) for the sliding surface, the smooth sliding property and the difference between the coefficient of kinetic friction and the coefficient of static friction during opening and closing are improved. And the conductivity between the rotating main body and the base body is ensured by kneading the conductive material powder.

Further, as means for ensuring the conductivity, a projection formed of a conductive material as a reinforcing material is exposed on the sliding surface or the inner end of the washer, and the base of the bracket which is in sliding contact with the washer is electrically conductive. The configuration is such that the tops of the conductive material projections are in direct sliding contact with each other, so that the conductivity can be reliably ensured.

[0009] Further, by adjusting the torque while tightening the fitting member at the fitting end of the support shaft with a screwing nut or caulking, it is possible to freely set the torque according to the application, and to reduce the number of parts. Less assembly work is now possible.

[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 support shaft 3 constituted by a shaft is fixed to the base of the bracket 2 supporting the rotating main body, and is mounted on the base body. The panel end of the bracket 1 is rotatably fitted between the washers 4 via a flange 5 provided at one end of the support shaft 3, a stopper 6, and the like. The nut 7 is adjusted to a predetermined torque and fixed.

The support shaft 3 has a fixed length shaft portion on the fixed side.
A flange 5 is provided on the fitting end side with 31 placed, and a tip of the flange 5 is provided with a deformed shaft portion 33 into which a fitting hole of a stopper 6 for restricting rotation of the bracket 1 is fitted, and a tip thereof is a nut. A male screw 32 into which the screw 7 is screwed is formed.

The washers 4 and 4 are made of a material obtained by kneading graphite, carbon, or carbon fiber as a conductive material powder into a synthetic resin based on PTEF (polytetrafluoroethylene), and reinforcing a metal plate, a metal mesh, or the like into a material. Alternatively, it is configured as a core material, is fitted to the support shaft 3 with the panel end of the bracket 1 sandwiched from both sides, and the male screw 32 and the screwing nut 7 press the contact surface between the panel end of the bracket 1 and the washer 4 appropriately. After the torque is adjusted to the adjusted state, the screwing nut 7 is fixed with an adhesive, caulking, or the like.

In a synthetic resin based on PTEF (polytetrafluoroethylene), the static friction torque required for a free stop as a sliding material is about 4 kg × cm to 5 kg × cm. It is extremely low compared to 7 kg x cm to 9 kg x cm of the sintered metal used, and the difference between the dynamic friction torque and the static friction torque is extremely small as compared with conventional sliding materials. Is very good, and the accuracy of the open / close angle by the free stop is easily obtained.

With this configuration, a balanced rotational friction force and slidability between the washers 4 and 4 and the panel end contact surface of the bracket 1 are ensured, and a reinforcing metal mesh,
Conductivity between the brackets 1 and 2 is also ensured via a metal plate or a blended conductive material powder.

When it is necessary to ensure the conductivity, a protrusion 43 is formed on a conductive material 42 such as a metal or a metal mesh as a reinforcing material, and the synthetic resin sliding surface 41 of the washer 4 is formed. Alternatively, the protrusion 43 is exposed at the inner diameter end portion 44 so that the base of the bracket 1 that slides on the washer and the top of the conductive material protrusion directly slide.

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

The support shaft 3 and the washer 4 are connected to each other by adjusting the amount of tightening of the screw nut 7 and the amount of caulking at the fitting end of the support shaft 3.
The rotation torque can be set to a predetermined value.

[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 side view showing an embodiment of a spindle similarly constituted by a shaft.

FIG. 3 is a perspective view showing an embodiment of a washer in which a protrusion is similarly formed on a conductive material of a reinforcing material, and a top of the protrusion is exposed on a sliding surface.

FIG. 4 is a perspective view showing an embodiment of a washer in which a projection of the conductive material is similarly exposed at an inner end.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bracket which supports a rotating main body 2 Bracket which is supported on a base body 3 Support shaft 31 Shaft part 32 Male screw 33 Deformed shaft part 4 Washer 41 Sliding surface of washer 42 Conductive material of reinforcing material 43 Projection part 44 Inner end Part 5 Flange 6 Stopper 7 Screw nut

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Makoto Natori 10801-5 Haramura, Suwa-gun, Nagano F-term in the Norton Suwa Plant (reference) 3J105 AA03 AB11 AB50 AC07 BB55 BC14 BC31 DA06

Claims (2)

[Claims] 1. A rotating support shaft interposed between a bracket for supporting a rotating main body and a bracket mounted on a base body, wherein a shaft is fixed to a base of one bracket, and the other bracket is provided. The base portion is rotatably fitted to the shaft via a washer made of a material obtained by kneading a conductive material powder into a synthetic resin whose base surface is PTEF (polytetrafluoroethylene). A free-stop hinge characterized in that the fitting end of the shaft is torque-adjusted by tightening the fitting member with a screw nut or caulking. 2. A projection formed of a conductive material as a reinforcing material is exposed on a sliding surface or an inner diameter end of a washer, and a base of a bracket which slides on the washer and a top of the conductive material projection are in direct sliding contact. 2. The free stop hinge according to claim 1, wherein the hinge is configured as follows.