JP2004169870A - Rotation suppressing mechanism of movable body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obviate the necessity of filling oil and applying grease, and to obtain high durability with regard to a movable body such as an opening/closing lid of various vessels or a liquid crystal display stand of a desktop personal computer. <P>SOLUTION: A rotation suppressing mechanism of the movable body comprises a rotary shaft mounted on a device main body, the movable body having a through hole fitting the rotary shaft, a holding ring arranged along the through hole and fixing to the movable body, a braking member made of abrasion-resistant engineering plastics engaged in the holding ring, a washer being in contact with the braking member and turning or stopping with the rotary shaft. By tightening the whole mechanism, when the movable body rotates, a side face of the braking member and the side face of the washer form frictional surfaces. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotation suppressing mechanism which does not require lubrication and grease application and has high durability, and more particularly to a rotation suppressing mechanism for a movable body such as an opening / closing lid of various containers or a liquid crystal display stand of a desktop personal computer.
[0002]
[Prior art]
In general passenger cars, various turning mechanisms are installed in the glove box cover plate, sun visor, car navigator, in-vehicle TV, etc. so that the movable body such as the opening / closing lid and the LCD display unit can be swiveled to a predetermined position and stopped. are doing. In addition, there are many movable bodies provided with an opening / closing lid even in a general home or company, such as an opening / closing lid for a copier or a scanner, a keyboard lid and a back lid for an electronic organ or a piano, and a front panel for a writing desk. Can be exemplified. These movable bodies can be vertically turned by a turning mechanism such as a hinge or a rotary fitting. Since these swivel mechanisms freely rotate in any of the vertical and horizontal directions, they can be injured when closing the lid, etc. May be damaged.
The turning suppressing mechanism appropriately prevents the turning of the movable body in place of the above-mentioned turning mechanism, thereby preventing the moving body such as the opening / closing lid from suddenly turning and causing an accident. As this turning suppression mechanism, a mechanism is generally used in which a rotating shaft of a movable body is inserted into a through hole of a device main body, and a nut is strongly fastened to the rotating shaft via a washer and several disc springs. In this turning suppression mechanism, the side wall surface and the washer surface of the device main body become friction surfaces, and the rotation of the movable body is strongly suppressed by the elasticity of several disc springs. This lubrication surface requires regular lubrication or grease application to maintain pivoting operation.
[0004]
[Problems to be solved by the invention]
Performing regular lubrication and grease application with the above-described turning suppression mechanism is a complicated operation, and even if such periodic maintenance work is performed, the contact portion is worn by strong spring elasticity, and abrasion residue is generated, and the movable body is generated. It is easy for the turning operation to be difficult. The present inventor has already proposed a turning restraint mechanism in Japanese Patent Publication No. 7-59427 and Japanese Patent No. 2650149, and these turning restraining mechanisms appropriately apply a brake to both the upper and lower turning directions, whereby the lid Although there is an advantage that a sudden downward turn does not occur, the size of the mechanism is slightly long and the structure is somewhat complicated, so that it may not be possible to meet the demand of the user for cost reduction. Japanese Patent No. 2770297 is popular because it has a simple structure and the opening and closing operation of the lid can be appropriately adjusted. Even if the movable body can be used, in order to suppress the opening and closing operation of a relatively large and heavy movable body, it is not possible to simply increase the size according to the load of the movable body.
According to the present invention, as a result of repeated studies on a device for suppressing the turning of a movable member that is somewhat heavy, it is possible to prevent the plastic braking member from being deformed by pressure and thermal expansion, thereby enabling tens of thousands of turns by a relatively heavy moving member. It is an object of the present invention to propose a turning suppressing mechanism which has a high durability that can cope with a test, has a simple structure, and is inexpensive to manufacture. It is another object of the present invention to provide a turning suppressing mechanism that can omit periodic maintenance work by eliminating the need for lubrication and grease application.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a turning suppression mechanism according to the present invention includes a rotating shaft attached to a device main body, a movable body provided with a through-hole into which the rotating shaft is fitted, and a concentric arrangement with the through-hole. The vehicle includes a retaining ring fixed to the movable body, a wear-resistant engineering plastic braking member fitted into the retaining ring, and a washer that contacts the braking member and rotates or stands with the rotation shaft. In this turning suppression mechanism, when the movable body is turned by tightening the entire mechanism, the side surface of the braking member and the side surface of the washer become friction surfaces. In addition, since the braking member fits inside the retaining ring, the retaining ring prevents the braking member from deforming outward.
In the turning suppressing mechanism according to the present invention, it is possible to arrange braking members on both side surfaces of the movable body. Therefore, the turning suppressing mechanism is configured such that a rotating shaft attached to the device body, a movable body provided with a through-hole into which the rotating shaft is fitted, and fixed to both surfaces of a plate-shaped movable body arranged concentrically with the through-hole. The two retaining rings, two braking members fitted into the respective retaining rings, and two washers that come into contact with the respective braking members and rotate and stop with the rotating shaft. In this turning suppression mechanism, when the movable body is turned by tightening the entire mechanism via a disc spring, the side surface of each braking member and the side surface of the washer become a friction surface.
[0008] In the turning suppressing mechanism of the present invention, it is preferable that a projection for preventing rotation is formed on the outer peripheral surface or side surface of the braking member, whereby the braking member rotates or stops together with the movable body. The outer diameter of the washer in contact with the braking member is slightly smaller than the inner diameter of the retaining ring, allowing the washer to enter the retaining ring when the entire mechanism is tightened.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
As illustrated in FIGS. 3 and 4, the turning suppression mechanism 1 according to the present invention includes a braking member 22 that operates integrally with the movable body, that is, the extension portion 14, and a washer 26 that integrally operates with the device main body, that is, the rotating shaft 10. The holding ring 18 is entirely disposed on the outer periphery of the braking member. For this reason, the plastic braking member 22 has an inner surface that comes into contact with the extension portion 14 and is completely surrounded by the metal retaining ring 18 and the washer 26, so that there is room for deformation or expansion even under pressure and heat. Absent. Each of the braking member 22 and the washer 26 is a donut-shaped disk, and the friction surface between the braking member 22 and the washer 26 is flat, so that less wear residue is generated. Moreover, since the braking member 22 is made of wear-resistant engineering plastic, the turning suppressing mechanism 1 can be used for a long time.
In FIGS. 3 and 4, the braking members 22, 24 are arranged on both sides of the extension portion 14, but it is also possible to arrange the braking members on only one side. Both ends of the rotating shaft 10 may be supported by a fixed plate, or two extensions 14 may be inserted into one rotating shaft. Also, two or more disc springs 30 may be used, or the nut 32 may be fastened with a caulking stop instead of the nut 32.
In the turning suppressing mechanism 1, the brake member 22 and the washer 26 can be manufactured if they have the same outer diameter and a diameter of 7 to 8 mm or more. After the braking member 22 and the washer 26 are fitted into the holding ring 18 of the extension portion 14, the entire rotation suppressing mechanism 1 is tightened, so that the side surface of the braking member 22 and the side surface of the washer 26 become frictional surfaces. 14 can be stopped at any rotational position.
The holding ring 18 may be formed by spot welding a ring-shaped metal material to the extension portion 14 or by forming a metal by cutting. The inner diameter of the retaining ring 18 is slightly larger than the outer diameter of the braking member 22 and the washer 26, and the thickness of the retaining ring is greater than the thickness of the braking member 22.
The braking members 22 and 24 need to be provided with a detent member at the extension 14 of the movable body so as not to run idle with the washer. As an example, a side projection 38 (FIG. 7) or a peripheral projection 44 (FIG. 8) is formed on the braking member, while a depression 40 (FIG. 6) on the extension 14 or a depression 48 (FIG. 6) on the inner peripheral surface of the retaining ring. 8) is provided. Further, a pin penetrating the braking member 22 and the extension portion 14 may be attached, or the outer peripheral surface of the braking member and the inner peripheral surface of the holding ring may be non-circular planes such as ellipses and rectangles. The extension 14 may be integrated.
The equipment having a movable body to which the turning suppression mechanism 1 is attached includes, for example, a car navigation device 2 (FIG. 1), a writing desk 5 (FIG. 2), a copier or scanner having an opening / closing lid, and a liquid crystal display stand of a desktop personal computer. , Laptop PCs, space-saving desktop PCs, car glove boxes, sun visors, on-board TVs, etc. For home use, for example, the present invention can also be applied to the toilet seat 52 of the Western-style toilet 50 as shown in FIG. 9, and in this case, a pair of turning suppression mechanisms 54 is provided.
[0015]
【Example】
The present invention will be described with reference to the drawings, but the present invention is not limited to the embodiments. 1 and 2 illustrate a movable body and a device main body to which the turning suppression mechanism 1 (FIG. 3) according to the present invention can be applied. FIG. 1 shows a car navigation device 2 installed in an automobile, in which a movable body 3 of a turning suppression mechanism is a liquid crystal display display unit, and a device body 4 is a stand body installed on a dashboard. FIG. 2 shows a commercially available writing desk 5, in which a movable body 6 of the turning suppression mechanism is a front plate and a device body 7 is a desk body.
As shown in FIGS. 3 and 4, the turning suppressing mechanism 1 has a rotating shaft 10 which is horizontally fixed to a fixing plate 8 of the apparatus main body by caulking. The rotating shaft 10 is a non-circular shaft in which a male screw thread 12 is engraved on the front part and both sides 13, 13 of the peripheral surface are cut in parallel along the axial direction as is clear from FIG. An extension 14 of a movable body is arranged in the turning suppression mechanism 1, and the rotating shaft 10 is inserted into a circular through hole 16 (FIG. 6) of the extension. The shapes and dimensions of the fixed plate 8 and the extension 14 are appropriately changed according to the apparatus main body and the movable body, and a structure that supports both ends of the rotating shaft is provided, or two extensions are separately mounted on one rotating shaft. It is also possible.
The turning restraining mechanism 1 further has holding rings 18 and 20 which are arranged concentrically with the through holes 16 and are fixed to both surfaces of the plate-shaped extension portion 14, and are fitted in the holding rings 18 and 20. It has braking members 22 and 24, washers 26 and 28 that come into contact with each braking member, at least one disc spring 30, and a nut 32. The washers 26 and 28 are provided with non-circular through holes 33 (FIG. 5) corresponding to the non-circular cross section of the rotating shaft 10. Further, the braking members 22 and 24 are provided with a circular through-hole 36 (FIG. 7) that can be inserted into the rotating shaft 10, and have the same diameter as the through-hole 16.
The rotary shaft 10 is fitted with, for example, a sleep 34 and circular plates 35, 35 for appropriate isolation. Next, the second washer 28, the second braking member 24, the extension portion 14 of the movable body, the first braking member 22, and the first washer 26 are sequentially fitted on the rotating shaft 10, and a nut 32 is further connected via a disc spring 30. Fasten with. In FIG. 3, the washers 26, 28 are made of hard metal, while the braking members 22, 24 are preferably injection molded articles of a wear-resistant engineering plastic such as carbon-containing polyacetal resin.
The retaining rings 18 and 20 are usually of the same shape, are arranged concentrically with the through holes 16 on both sides of the extension 14 of the movable body, and are fixed to the extension 14 by spot welding or the like (see FIG. 6). . The inner diameter of the retaining ring 18 is slightly larger than the outer diameter of the braking members 22, 24. Further, the thickness of the retaining ring 18 is larger than the thickness of the braking members 22 and 24.
The braking members 22 and 24 are usually the same shape, and are donut-shaped disks having flat sides. The rotating shaft 10 can be rotatably fitted into the center hole 36 of the braking member 22. When the braking member 22 is fitted to the retaining ring 18, the center hole 36 matches the through hole 16 of the extension 14. The braking member 22 is formed with a pair of detent protrusions 38, 38 (FIG. 7) on the side surface on the extension portion 14 side so as to be able to rotate and stop reliably with the extension portion 14. Indentations 40, 40 (FIG. 6) are provided on the corresponding side surfaces of the 14. When the entire rotation suppressing mechanism 1 is tightened, the projections 38, 38 fit into the recesses 40, 40, respectively.
The washers 26 and 28 are generally the same shape, and are generally donut-shaped disks with flat sides. The center hole of the washer 28 is a non-circular through-hole 33. When the washer 28 is fitted on the rotating shaft 10, the washer 28 rotates and stops together with the rotating shaft. Washer 28 has approximately the same outer diameter as braking member 24 and can be fitted to retaining ring 18.
FIG. 8 shows another braking member 42. In this braking member, instead of the protrusions 38, 38, two or six protrusions 44 are provided at equal intervals on the peripheral surface. It is necessary to form a recess 48 in the inner peripheral surface of the retaining ring 46. By having the projections 44 and the recesses 48, the braking member 42 always rotates and stops together with the extension of the movable body.
When the rotation suppressing mechanism 1 is assembled and tightened with the nut 32, the brake members 22, 24 are elastically pressed by the washers 26, 28 by the disc spring 30, and both enter the holding ring 18 or 20. At this time, the projections 38, 38 of the braking members 22, 24 fit into the recesses 40, 40 of the extension portion 14, and the braking member rotates together with the extension portion 14 of the movable body. On the other hand, since the washers 26 and 28 have the non-circular through holes 33, they are stationary together with the rotating shaft 10, that is, the fixed plate 8 of the device main body.
The turning suppressing mechanism 1 has a thickness of only about 10 mm even when all necessary members are added, and the plastic braking members 22, 24 are brought into surface contact with the washers 26, 28 to tighten the entire mechanism. The side surface of the rotating braking member 22 and the side surface of the stationary washer 26 serve as friction surfaces, and the extension portion 14 of the movable body can be stopped at an arbitrary rotational position. The turning restraint mechanism 1 receives a load of about 50 kg weight acting when rotating the movable body on the side surfaces of both braking members and the side surfaces of both washers. Since the plastic brake members 22 and 24 have their outer peripheral surfaces tightly surrounded by the retaining ring 18 or 20, they do not deform or break outward even when a continuous pressing force or heat is applied. It can be used for a long period of time and easily withstands tens of thousands of turning tests.
In the car navigation device 2 shown in FIG. 1, when the movable body 3 of the liquid crystal display is rotated, the braking members 22 and 24 are rotated via the extension 14 attached to the movable body. The display unit can be lowered or turned upside down from the page of FIG. Further, if the rotation suppressing mechanism has the rotation axis 10 arranged in the vertical direction with respect to the liquid crystal display, the screen of the liquid crystal display can be rotated 360 degrees.
[0026]
【The invention's effect】
In the turning suppressing mechanism according to the present invention, the outer periphery of the plastic braking member is in close contact with the inner peripheral surface of the retaining ring, and the outer peripheral image of the braking member is closely surrounded by the retaining ring. Therefore, even if a continuous pressing force or heat is applied to the braking member, the turning suppressing mechanism can be stably used for a long period of time without deforming or damaging the braking member outward. This turning suppression mechanism appropriately brakes both the upper and lower turning directions of the movable body to prevent the movable body from suddenly turning, and has a relatively small overall thickness and a simple structure. Can appropriately respond to the demand for cost reduction.
In the turning suppressing mechanism of the present invention, even if operations such as lubrication or grease application are omitted, seizure does not occur as in the case of the conventional metal mechanism, and the brittleness of the conventional plastic hinge does not occur. do not have. Therefore, the turning restraint mechanism of the present invention is advantageous in terms of manufacturing cost and running cost, and can withstand a load of up to about 50 kg weight acting when rotating the movable body, thereby enabling various fields such as a passenger car field. It is possible to apply to.
Further, in the turning restraining mechanism of the present invention, the friction surface between the braking member and the washer is flat, and even if the moving body is turned frequently, there is no generation of wear residue at the contact portion. However, the turning operation of the movable body is always constant. The braking member of this turning suppression mechanism can easily withstand tens of thousands of turning tests.
[Brief description of the drawings]
FIG. 1 is a front view showing an application example of a turning suppression mechanism of the present invention.
FIG. 2 is a perspective view showing another application example of the turning suppression mechanism.
FIG. 3 is a side view showing an example of the turning suppressing mechanism according to the present invention, and shows an extended portion of the movable body in a cross section.
FIG. 4 is an exploded side view showing a turning suppressing mechanism of the present invention, and a part thereof is shown in a cross section.
FIG. 5 is a sectional view taken along line AA of FIG. 3;
FIG. 6 is an end view of the extension shown along BB in FIG. 4;
FIG. 7 is a perspective view of a braking member applicable to the extension of FIG. 6;
FIG. 8 is a front view showing a state where another braking member has been fitted into the holding ring.
FIG. 9 is a plan view showing another application example of the turning suppression mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotation suppressing mechanism 8 Fixing plate 10 of device main body Rotating shaft 12 Male thread 14 Extensions 18 and 20 of movable body Holding rings 22 and 24 Braking members 26 and 28 Washers 30 Disc springs 32 Nuts

Claims (3)

A rotating shaft to be attached to the device body, a movable body provided with a through hole into which the rotating shaft is fitted, a holding ring arranged concentrically with the through hole and fixed to the movable body, and fitted into the holding ring. A braking member made of abrasion-resistant engineering plastic, and a washer that comes into contact with the braking member and that rotates or stops along with a rotation axis. And a side surface of which serves as a friction surface, and the braking member fits inside the retaining ring, thereby preventing the braking member from being deformed outward by the retaining ring. A rotating shaft attached to the device main body, a movable body provided with a through hole into which the rotating shaft is fitted, and two holding rings arranged concentrically with the through hole and fixed to both surfaces of the plate-shaped movable body; It has two braking members made of wear-resistant engineering plastic fitted in each retaining ring, and two washers that come into contact with each braking member and rotate and stop together with the rotating shaft, and through a disc spring. By tightening the entire mechanism, when the movable body is turned, the side surface of each braking member and the side surface of the washer become a friction surface, and each braking member fits inside the retaining ring, so that each retaining ring allows the braking member to move outward. A turning control mechanism that prevents deformation. By forming a projection for preventing rotation on the outer peripheral surface or side surface of the braking member, the braking member rotates or stops together with the movable body, and the outer diameter of the washer that contacts the braking member is larger than the inner diameter of the holding ring. 3. The turning suppression mechanism according to claim 1, wherein the washer is slightly smaller, and the washer enters the holding ring when the entire mechanism is tightened.

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