JPH0678618U - Pivot structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pivotal structure having an angle holding function with excellent durability. [Structure] The second member 3 is rotatable with respect to the first member.
In the structure of pivotally attaching the flat plate-shaped washer 10, the second member 3, the first truncated conical washer 13, and the second truncated conical washer 14 on the shaft 4 fixed to the first member. , And the flange-shaped washer 7 and the caulking portion 8 are formed to sandwich these elements between the flange 6 and the flange-shaped washer 7. The first truncated cone washer 13 is fixed to the second member 3 and the second truncated cone washer 14 is fixed to the flanged washer 7. When the second member 3 rotates with respect to the first member, the first and second frustoconical washers 13, 14 rub against each other, and the angle holding function is achieved by the frictional force exerted therebetween.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pivotal mounting structure for rotatably mounting two members relative to each other, and in particular, the angle between the two members can be any size. The present invention relates to a pivot structure that can be held by.

[0002]

[Prior art]

 For example, in an OA device such as a word processor or a personal computer equipped with a display, a laptop type or a notebook type is often provided with a display unit rotatable or angle adjustable with respect to a main body. By doing so, the operator can adjust the angle of the OA device so that it is easy to see each time the OA device is used.

When adjusting the angle of the display unit as described above, it is preferable that stepless adjustment is possible, and when the angle of the display unit is changed, the posture of the display unit is maintained up to that angle. It is preferable that Therefore, the mechanism for pivotally attaching the display unit to the main body normally has a relatively large resistance against rotation. Then, the resistance to this rotation is made to be generated by frictional force, for example. Therefore, various measures are taken to increase the frictional force in order to enhance the angle holding function of the display unit.

[0004]

[Problems to be solved by the device]

 By the way, the structure for pivotally attaching the display unit to the main body as described above must have durability. This is because, as the use of such OA equipment becomes difficult or impossible to maintain the angle of the display section, the commercial value itself is lowered. However, demanding such durability may result in a conflict with the aforementioned increase in frictional force. That is, when the frictional force between members that rub against each other is increased during the operation of the pivot structure, seizure easily occurs in these members, and as a result, the angle holding function may be deteriorated. The durability mentioned above is also related to the size of the components constituting the pivot structure. That is, for example, the larger the diameters of the members that rub against each other during operation of the pivot structure, the generally better the durability. However, in many cases, the size of the above-described members cannot be increased so much due to the design restrictions of the device in which such a pivot structure is used.

A similar problem is encountered not only in the pivot structure of the display section in the OA equipment, but also in the pivot structure used in other fields as long as the angle holding function is required. For example, there are a pivoting structure between a plurality of links in a pantograph mechanism, a pivoting structure of two legs in a drawing compass, and a pivoting structure of a mirror in a mirror stand.

[0006] Therefore, an object of the present invention is to provide a pivotal structure that is small in size but has excellent durability of an angle holding function.

[0007]

[Means for Solving the Problems]

 The present invention is directed to a pivotal structure for rotatably attaching the first and second members to each other with respect to each other, and solves the above-mentioned technical problem. It is characterized by having the following configuration.

First, the shaft is fixed to the first member in the rotational direction, and the shaft is formed with first and second flanges at predetermined intervals. In the preferred embodiment, one of the first and second flanges is formed integrally with the shaft and the other is arranged on the shaft and by crimping the end of the shaft. Provided by a flanged washer that is fixed.

The second member has a hole for receiving the shaft and is rotatably held with respect to the shaft between the first and second flanges. A flat plate washer is arranged on the shaft between the first flange and the second member. The flat washer is preferably made of a material that is relatively softer than the first flange and the second member.

Further, between the second member and the second flange, the first and second truncated cone-shaped washers are arranged on the shaft in the same direction so as to make surface contact with each other. Here, the first truncated cone washer is fixed to the second member in the rotation direction, and the second truncated cone washer is fixed to the second flange in the rotation direction. The first and second truncated cone-shaped washers are regulated so as to come into pressure contact with each other according to the distance between the first and second flanges and the thicknesses of the flat plate-shaped washer and the second member. In a preferred embodiment, the respective fixing of the above-mentioned first and second frusto-conical washers with respect to the direction of rotation with respect to the second member and the second flange is carried out by the first and second frusto-conical washers respectively. The burr left during the processing of is advantageously used. That is, by fixing the edges of the burrs left on the first and second truncated cone-shaped washers to the second member and the second flange, respectively, the above-mentioned fixing in the rotational direction is achieved. To be done.

[0011]

[Action]

 In the pivot structure according to the present invention, each of the first and second frusto-conical washers is based on its own shape and exerts a spring force in the axial direction of the shaft while applying the first and second flanges. Are pressed into contact with each other based on the spacing defined by Then, the first truncated cone washer rotates and is fixed to the second member in the rotational direction, so that the first truncated cone washer acts together with the second member, and the second truncated cone washer moves to the second member. Is rotationally fixed to the flange of the first flange, so that it acts with the second flange or shaft and the first member. Therefore, in this pivot structure, the first and second frusto-conical washers rub against each other during the rotational movement, and the frictional force that provides the angle holding function is generated by the first and second cones. Created between trapezoidal washers.

[0012] Furthermore, the flat plate-shaped washer arranged between the first flange and the second member is the first flange, that is, the first member and the second member during the operation of the pivot structure. Is allowed to rotate relative to each other, and the first flange and the second member are brought into surface contact with each other, thereby generating a frictional force giving an angle holding function. The flat plate-shaped washer may act both with the first flange and with the second member during the operation of the pivot structure.

[0013]

[Effect of device]

 Thus, according to the present invention, surface contact is realized between both sides of the flat washer and between the first and second truncated cone-shaped washers, respectively, and the surface contact is evenly distributed in the circumferential direction. Therefore, even if the pivot structure is downsized in the radial direction, stable torque can be obtained with high durability. Therefore, the angle holding function of the pivot structure can be made excellent in durability.

As described above, one of the first and second flanges is formed integrally with the shaft, and the other one is disposed on the shaft and the end of the shaft is caulked. When the flat washer is fixed on the shaft by placing the flat washer, the second member, and the first and second truncated cone washers on the shaft, the flange washer is attached to the shaft. Assembling of this pivot structure becomes easier because it can be fixed to the end. Further, by controlling the pressure exerted in the caulking of the end portion of the shaft described above, the torque for relative rotation of the first and second members can be adjusted, and the pivot structure having an arbitrary torque can be adjusted. Will be easier to obtain. At this time, if the flat plate washer is made of a material that is relatively softer than the first flange and the second member, the flat plate washer can also have a function of absorbing a shock received during crimping.

Further, the edges of the burrs left at the time of processing the first and second truncated cone-shaped washers are bited into the second member and the second flange, respectively, so that the first truncated cone-shaped washer is formed. By fixing the washer in the direction of rotation with respect to the second member and the second frustoconical washer in the direction of rotation with respect to the second flange, a desired fixing state can be obtained without requiring any special fixing means. Can be achieved.

[0016]

【Example】

 FIG. 1 is a front view showing a pivot structure 1 according to an embodiment of the present invention. FIG. 2 is a front view showing elements constituting the pivot structure 1 shown in FIG. 1 separated from each other. FIG. 3 is an enlarged cross-sectional view showing a main part of the pivot structure 1 shown in FIG.

The pivot structure 1 is for mounting the first and second members 2 and 3 so as to be rotatable relative to each other. Here, for example, when this pivot structure 1 is applied to an OA device including a display, the first member 2 is fixed to the main body side of the OA device, and the second member 3 holds the display unit. To do. When the pivot structure 1 is applied to a drafting compass, the first and second members 2 and 3 are attached so as to hold the legs, respectively.

A shaft 4 is fixed to the first member 2 in the rotational direction. For this fixing, the projection 5 provided at the end of the shaft 4 is inserted into the hole provided in the first member 2 and the projection 5 is caulked. A flange 6 is integrally formed on the shaft 4. A flange-shaped washer 7 is arranged at the other end of the shaft 4, and the flange-shaped washer 7 is formed by crimping the end of the shaft 4 and forming a crimped portion 8 as shown in FIGS. 1 and 3. It is fixed to the shaft 4. Note that the flange-shaped washer 7 is fixed to the end of the shaft 4 after the elements included in the pivot structure 1 described below are arranged on the shaft 4.

As shown in FIG. 3, the second member 3 has a hole 9 for receiving the shaft 4, and is rotatably held with respect to the shaft 4 between the flange 6 and the flange-like washer 7. .

A flat washer 10 is arranged on the shaft 4 between the flange 6 and the second member 3. As shown in FIG. 3, it is preferable that the flat washer 10 has a recess 11 formed on one surface of the peripheral edge of the inner diameter thereof for the following reason. Since the shaft 4 is usually formed by cutting, it is difficult to form a right-angled edge in the inner corner portion 12 shown in FIG. 3, and the inner corner portion 12 is rounded to some extent or more to some extent. Is left. Therefore, it may be difficult for the flat washer 10 to make surface contact with the flange 6. As described above, by forming the recess 11 in the flat washer 10, the rounded inner corner portion 12 can be received therein, and therefore the flat washer 10 can be surely brought into surface contact with the flange 6. You can

Between the second member 3 and the flange-shaped washer 7, first and second truncated cone-shaped washers 13 and 14 are arranged on the shaft 4 in the same direction so as to make surface contact with each other. It Then, the first truncated cone washer 13 is fixed to the second member 3 in the rotational direction, and the second truncated cone washer 14 is fixed to the flanged washer 7 in the rotational direction. In this embodiment, the burrs 15 and 16 left during processing for obtaining the first and second frustoconical washers 13 and 14, respectively, are advantageously used for the above-mentioned fixing, as shown in FIG. . These burrs 15 and 16 are inevitably formed when blanks can be punched to form frustoconical washers 13 and 14, respectively, and are also desired by selecting the punching direction described above. Can be turned to.

The above-described first and second truncated cone-shaped washers 13 and 14 are pressed against each other due to the distance between the flange 6 and the flange-shaped washer 7 and the thicknesses of the flat plate-shaped washer 10 and the second member 3. Regulated by.

In assembling the pivot structure 1 described above, the flat plate-shaped washer 10, the second member 3, the first truncated cone-shaped washer 13, and the second truncated cone-shaped washer are sequentially mounted on the shaft 4. 14 and the flanged washer 7 are arranged, after which the end of the shaft 4 is crimped to form the crimped portion 8. In order to fix the shaft 4 to the first member 2, the step of crimping the protrusion 5 may be performed simultaneously with the step of forming the crimp portion 8 described above, or may be performed at different times. .

In the pivot structure 1 thus obtained, when the second member 3 is rotated with respect to the first member 2, the first and second frustoconical washers 13 and 14 are brought into contact with each other. The surfaces that are in surface contact rub against each other, and the angle holding function is achieved by the frictional force between them. As shown in the drawing, the first and second frustoconical washers 13 and 14 have the same shape, and are made of the same material, so that the frustoconical washers 13 and 14 are mutually different. If the same spring force and surface hardness are given, the abrasion resistance is further improved against the above-mentioned friction. Further, when the second member 3 is rotated with respect to the first member 2, the flat plate washer 10 rubs against the flange 6 and / or the second member 3 to allow the rotation.

In order to test the durability of the pivot structure 1 according to the above-described embodiment with respect to the angle holding function, the pivot structure 1 was assembled using parts having the following materials and dimensions. That is, stainless steel (SUS416) was used as the shaft 4, and the diameter of the flange 6 was set to 7 mm. Further, phosphor bronze was used as the flat washer 10 and its plate thickness was 0.5 mm. Further, carbonitrided steel (SPCC) was used as the material of each of the second member 3 and the first and second truncated cone-shaped washers 13 and 14, and the respective plate thicknesses were set to 1. It was set to 2 mm, 0.6 mm and 0.6 mm. Further, steel (SECC) was used as the flanged washer 7, and the plate thickness thereof was 1.6 mm. In the pivot structure 1 thus obtained, the initial torque when trying to rotate the second member 3 with respect to the first member 2 was 40 kgmm. Regarding this pivot structure 1, after the second member 3 was reciprocally rotated 60,000 times with respect to the first member 2 at a rotation angle of 180 °, the torque was measured and maintained at a value of 24 kgmm. I was able to. In this embodiment, the suitable torque is 20 kgmm or more.

Although the present invention has been described above with reference to the illustrated embodiments, the following modifications are possible within the scope of the present invention.

For example, the first and second frusto-conical washers 13 and 14 may be arranged between the second member 3 and the flange-shaped washer 7 in directions opposite to those shown. .

Further, although the flanged washer 7 is fixed to the shaft 4 by forming the caulked portion 8, it may be fixed by other means. Further, the function of the flange-shaped washer 7 may be achieved by forming the caulking portion 8 into a flange shape without using the flange-shaped washer 7.

In the above-described embodiment, the second truncated cone washer 14 is fixed in the rotational direction with respect to the flange-shaped washer 7 by incorporating the edge of the burr 16 into the flange-shaped washer 7. However, in order to increase the reliability of such fixing, the second truncated cone washer 14 may be modified as shown in FIG. FIG. 4 is a bottom view of the truncated cone washer 14. In the truncated cone washer 14 shown in FIG. 4, an appropriate number of notches 17 are formed in the peripheral edge of the inner diameter portion by pressing. Such notch 17 effectively acts as a slip stopper for the flange-shaped washer 7.

[Brief description of drawings]

FIG. 1 is a front view showing a pivot structure 1 according to an embodiment of the present invention.

FIG. 2 is a front view showing elements included in the pivot structure 1 shown in FIG. 1 separated from each other.

3 is an enlarged sectional view showing a main part of the pivot structure 1 shown in FIG.

FIG. 4 is a second view used in another embodiment of the present invention.
It is a bottom view of the truncated cone washer 14 of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pivot structure 2 1st member 3 2nd member 4 Shaft 6 Flange (1st flange) 7 Flange washer (2nd flange) 8 Caulking part 9 Hole 10 Flat washer 13 1st truncated cone shape Washer 14 Second truncated cone washer 15, 16 Burr

Claims (4)

[Scope of utility model registration request] 1. A pivoting structure for rotatably attaching a first member and a second member to each other, wherein a shaft is fixed to the first member in a rotational direction. First and second flanges are formed on the shaft at a predetermined distance from each other, and the second member has a hole for receiving the shaft,
Rotatably held with respect to the shaft between the first and second flanges, a flat washer is disposed on the shaft between the first flange and the second member, A first member is provided between the second member and the second flange.
And a second frustoconical washer arranged on the shaft in the same direction so as to be in surface contact with each other, the first frustoconical washer being fixed to the second member in the rotational direction, A second frustoconical washer is rotationally fixed to the second flange, the first and second frustoconical washers include a spacing between the first and second flanges and the flat washer and A pivot structure in which the second members are regulated so as to come into pressure contact with each other according to the respective thicknesses of the second members. 2. One of the first and second flanges is formed integrally with the shaft, and the other of the first and second flanges is disposed on the shaft and by caulking an end portion of the shaft. The pivot structure of claim 1, provided by a fixed flanged washer. 3. The first and second frusto-conical washers each include a burr left during machining, wherein an edge of each burr is formed on the second member and the second flange. The pivot structure according to claim 1 or 2, which is fixed with respect to the rotation direction by biting into each. 4. The pivot structure according to claim 1, wherein the flat washer is made of a material that is relatively softer than the first flange and the second member.