JPH0747580Y2 - Friction lock device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is used for adjusting the angle of a panel display of a laptop computer, word processor, etc., and for preventing the fall of various lids such as an electric rice cooker and an electric pot. The present invention also relates to a friction lock device that can be used as well.

[Prior Art] Fig. 11 (a) is a front view of a conventional hinge used for connecting a lid and a compact body of a cosmetic compact.
11 (b) is a left side view thereof, FIG. 11 (c) is a right side view thereof, and FIG. 11 (d) is a sectional view taken along the line D-D shown in FIG. 11 (c).

In FIG. 11 (a), 10 is a fixing member fixed to the compact body, and as shown in FIG. 11 (c), a plate-shaped mounting portion 10 in which a hole 10b is provided in a substantially columnar member 10a.
c is integrally formed.

The fixing member 10 is fixed to the body by inserting a screw into the hole 10b and tightening the screw into the compact body. Element
A hole 10d is formed so as to penetrate in the axial direction passing through the center of 10a. 11 is a movable member, and as shown in FIG. 11 (d),
The movable member 11 has a substantially columnar shape, and a convex portion 11a is provided at the center of one end surface. A compact lid is attached to the convex portion 11a.

A hole 11b penetrates in the axial direction passing through the center of the movable member 11, and the spring pin 5 is press-fitted together with the hole 10d of the fixed member 10 as shown in FIG. 11 (d).

The movable member 11 rotates about the spring pin 5 as a rotation axis.

At this time, the rotational torque generated when the movable member 11 is rotated in both forward and reverse directions uses the frictional force generated between the inner surface of the hole 11b of the movable member 11 and the outer surface of the spring pin 5, With this rotation torque, the compact lid can be stopped at any position.

[Problems to be Solved by the Invention] In the above-described conventional technique, even if there is a slight variation in the outer surface of the spring pin 5 and the inner surface of the hole 11b of the movable member 11, the rotational torque is greatly affected and the rotational torque is greatly affected. Has greatly varied.

For this reason, the above-mentioned conventional techniques cannot be used for those requiring precision.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to increase the number of parts, facilitate the assembling, and continuously adjust the rotating torque, and obtain the rotating torque with high accuracy. It is to provide a possible friction lock device.

[Means for Solving the Problems] In order to achieve the above object, the present invention is a shaft member that is inserted into a movable member and a fixed member, and one side portion of the shaft member is slidable in the axial direction in a rotation restrained state. It is movably inserted into the movable member, and the other side portion is press-fitted into the fixed member, and the frictional force generated between the fixed member and the fixed member is made variable by this press-fitted length.

As the shaft member, a solid shaft member such as a parallel pin or a taper pin, or a shaft member that bends in the radial direction can be used.

Further, the shaft member may be subjected to rotation stop processing such as knurling on the outer circumference of the movable member side insertion portion.

Furthermore, the shaft member insertion hole of the fixing member is a cylindrical hole, a stepped hole,
Alternatively, either tapered hole may be used.

[Operation] The movable member rotates together with the shaft member. The rotational torque of the movable member at this time is determined by the frictional force generated between the shaft member and the fixed member.

The magnitude of the frictional force is adjusted by the press-fitting length of the shaft member with respect to the fixed member.

When the shaft member is a solid shaft made of parallel pins and a shaft member that bends in the radial direction, the contact area with the fixing member increases or decreases as the press-fitting length increases or decreases, and the frictional force generated between the fixing member also increases or decreases. . Thereby, the rotating torque of the movable member can be adjusted steplessly. The magnitude of the rotation torque at this time is the same in the raw reverse rotation of the movable member.

By applying anti-rotation processing such as knurling to the outer periphery of the movable member side insertion portion of the shaft member, it is possible to reliably restrain the relative rotation between the shaft member and the movable member.

Further, the shaft member is press-fitted into a cylindrical hole, a stepped hole or a tapered hole formed in the fixing member.

[Embodiment] Hereinafter, the present invention will be described in detail based on an illustrated embodiment.

1 to 4 show a friction lock device 1 according to a first embodiment of the present invention.

The friction lock device 1 is roughly composed of a movable member 2, a fixed member 3, and a shaft member 4.

As shown in FIG. 3, the movable member 2 is formed of a synthetic resin in a columnar shape, and a through hole 2a is formed in the axial center portion thereof.

In addition, one end (the left end in FIG. 3A) of the movable member 2 is cut in parallel to form a mounting portion 2b for a mating rotating member (for example, a lid of a compact case).

The fixing member 3 has a columnar shaft-supporting portion 31 and a flat plate-shaped fixing portion 32 integrally extending outside the shaft-supporting portion 31. A through hole 31a is formed in the shaft support portion 31, and the fixed portion 3
2 is a mating fixing member (for example, compact case body)
A mounting hole 32a is formed therein.

Further, the shaft member 4 is composed of parallel pins having a uniform diameter in the length direction. The shaft member 4 is inserted through the through holes 2a and 31a of the movable member 2 and the fixed member 3. This insertion is performed by press-fitting the shaft member 4 into the through holes 2a and 31a, and the press-fitting force at this time is designed such that the through holes 2a and 31a have a diameter so that the movable member 2 side is larger than the fixed member 3 side. Has been done. Due to this difference in the pressure input, the shaft member 4 is inserted into the through hole 2a of the movable member such that the shaft member 4 is slidable in the axial direction in a rotationally restrained state and is rotated together with the movable member 2. The other side portion of 4 is a through hole 31 of the fixing member 3.
When the movable member 2 is rotated, the frictional force is generated between the outer peripheral surface of the shaft member 4 and the hole wall of the through hole 31a. The frictional force at this time is the rotational torque of the movable member 2, and when an external force exceeding the rotational torque acts on the movable member 2, the movable member 2 can rotate for the first time in the acting direction of the external force.

The magnitude of this rotation torque is as shown in FIG.
Is determined by the press-fitting length L into the through hole 31a, and by increasing or decreasing the press-fitting length L, the contact area between the outer peripheral surface of the shaft member 4 and the hole wall of the through hole 31a increases or decreases, and the rotational torque is steplessly changed. It can be increased / decreased and a small amount of rotational torque can be adjusted.

As described above, in the friction lock device 1, the shaft member 4 is inserted into the movable member 2 such that one side portion thereof is axially slidable in a rotation restrained state, and the other side portion is fixed to the fixing member 3 and the fixing member 3. The press-fitting length L to obtain a desired frictional force (rotational torque) between them is press-fitted and assembled. The friction lock device 1 assembled in this way can obtain the same rotation torque by the forward and reverse rotations of the movable member 2, and the counter rotation member (for example, the counterpart rotation member attached to the movable member 2 by this rotation torque). , The lid of the compact case) can be held at any opening angle.

FIG. 5 shows a friction lock device 12 according to a second embodiment of the present invention.

The present device 12 is different from the friction lock device 1 only in that a shaft member 11 that bends in a radial direction such as a spring is used instead of the shaft member 4 of the friction lock device 1 described above, and other structures are the same. Since it is the same as No. 1, the same reference numeral is given and its description is omitted.

In this friction lock device 12, the through hole 31 of the fixing member 3
The rotational torque of the movable member 2 can be continuously adjusted by increasing or decreasing the press-fitting length L of the shaft member 13 with respect to a.

FIG. 6 shows a friction lock device 20 according to a third embodiment of the present invention.

The present device 20 is different from the friction lock device 1 only in that a shaft member 21 made of a taper pin is used instead of the shaft member 4 of the friction lock device 1 described above, and the other structure is the same as the device 1. Therefore, the same reference numerals are given and the description thereof is omitted.

The shaft member 21 is a taper pin whose diameter gradually increases from one end (the left end in FIG. 6) to the other end, and one end of the shaft member 21 is press-fitted into the through hole 2a of the movable member 2. The other side portion is press-fitted into the through hole 31a of the fixing member 3. The pressure input at this time is larger on the movable member 2 side than on the fixed member 3 side, and due to the difference in this pressure input, the shaft member
One side portion of 21 rotates together with the movable member 2, and at the time of this rotation, the other side portion rotates while generating a frictional force between the outer peripheral surface thereof and the hole wall of the through hole 31a. This frictional force becomes the rotational torque of the movable member 2.

The friction lock device 20 assembled in this manner has a through hole 31a.
The rotational torque can be adjusted steplessly by increasing or decreasing the press-fitting length L on the large diameter portion side of the shaft member 21 with respect to. The adjustment range at this time has the merit of expanding as compared with the case of using the parallel pin. The direction of taper of this shaft member 21 may be opposite to that described above.

7 and 8 show a friction lock device 30 according to a fourth embodiment of the present invention.

The friction lock device 30 has a structure in which the movable members 2 and 200 are arranged on both sides of the fixed member 3, and the shaft member 33 is inserted through the fixed member 3 and the movable members 2 and 200. The movable members 2 and 200 have the same structure in which through holes 2a and 200a are formed respectively, and the movable member 2 and 200 are attached to the mating member 2b and 200a.
200b are arranged on both sides of the fixing member 3 so as to face outward.

As shown in FIG. 8, the shaft member 33 has one end (left end in FIG. 8).
From the taper pin, the diameter of which gradually increases from the other end to the other end, and both sides of the through holes 2a and 200 of the movable members 2 and 200 are formed.
While being press-fitted into a, the central portion has a through hole 31a in the fixing member 3.
It is inserted into the fixed member 3 and the movable members 2 and 200 by being pressed into. The pressure input at this time is larger on the movable members 2 and 200 side than on the fixed member 3 side, and the movable members 2 and 200 and both side portions of the shaft member 33 rotate together due to the difference in the pressure inputs. During movement, the central portion of the shaft member 33 rotates while generating a frictional force between the outer peripheral surface of the shaft member 33 and the hole wall of the through hole 31a. This frictional force becomes the rotational torque of the movable members 2 and 200.

The friction lock device 30 assembled in this manner has a through hole 31.
The rotational torque can be adjusted steplessly by increasing or decreasing the press-fitting length L of the shaft member 33 on the large diameter portion side with respect to a.

FIG. 9 shows a modification of the shaft member. A shaft member 41 shown in FIG. 4A is a modified example of the shaft member 4 used in the friction lock device 1, and a knurling process 41a is applied to the outer periphery of the portion press-fitted into the movable member 2 along the axial direction. Further, the shaft member 210 shown in FIG. 3B is a modification of the shaft member 21 used in the friction lock device 20, and the outer periphery of the portion press-fitted into the movable member 2 is knurled 210a along the axial direction. There is. Further, the shaft member 330 shown in FIG. 7C is a modification of the shaft member 33 used in the friction lock device 30, and the knurling 330a and 330b are provided along the axial direction on the outer periphery of the press-fitted portion to the movable members 2 and 200. It has been subjected.

These deformed shaft members 41, 210, and 330 are assembled to the friction lock devices 1, 20, and 30, respectively, so that each shaft member 4
1,210 and 330 knurling 41a, 210a and 330a, 330b
The construction part of (1) bites into the movable members 2 and 200, and is pressed into the movable member in a more reliable rotation restrained state. At this time, since each knurling process is performed along the axial direction of each shaft member, the shaft member after press fitting can slide in the axial direction. Therefore, the press-fitting length L of the shaft member with respect to the fixed member 3 can be adjusted by sliding the shaft member in the axial direction, whereby the rotational torque of the movable member can be adjusted steplessly.

Further, the through hole 31a of the fixing member 3 used in the above-described friction lock devices 1, 10, 20, and 30 is not limited to a cylindrical hole having a uniform hole diameter as shown in FIG. It may be a stepped hole having a stepwise different hole diameter shown in (b), or a tapered hole having a gradually increasing or decreasing hole diameter shown in FIG. 10 (c). In this case, when the shaft member is a parallel pin, the diameter of the cylindrical hole,
The maximum hole diameter of the stepped hole and the maximum hole diameter of the tapered hole are designed to be slightly smaller than the outer diameter of the shaft member.

[Advantages of the Invention] As described above, according to the present invention, the shaft member inserted between the movable member and the fixed member serves as the rotation shaft of the movable member, and the shaft member and the fixed member are separated by the press-fitting length to the fixed member. Since the rotational torque of the movable member is adjusted by increasing / decreasing the frictional force generated between them, the assembly is easy without increasing the number of parts such as a rotational torque adjusting mechanism.

Further, since the above-described adjustment of the rotation torque is performed by the press-fitting length of the shaft member with respect to the fixed member, it becomes a stepless adjustment, and a minute adjustment of the rotation torque is possible, and a highly accurate friction lock device can be obtained.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention. FIG. 1 (a) is a front view, FIG. 1 (b) is a left side view, FIG. 1 (c) is a right side view, and FIG. 2 is FIG. FIG. 2C is a sectional view taken along line 2-2, FIG. 3 shows the movable member of the first embodiment, and FIG. 3A is a front view, FIG. 3B is a left side view, and FIG. Is a right side view, FIG. 4 shows the fixing member of the first embodiment, and FIG. 4 (a) is a front view.
The same figure (b) is a left side view, the same figure (c) is a right side view, FIG. 5 is a vertical sectional view of a second embodiment of the present invention, and FIG. 6 is a vertical sectional view of a third embodiment of the present invention. FIGS. 7A and 7B show a fourth embodiment of the present invention. FIG. 7A is a front view, FIG. 7B is a left side view, FIG. 7C is a right side view, and FIG. Fig. 7 (c) is a sectional view taken along line 8-8, Figs. 9 (a), (b), (c) are front views of other shaft members, and Figs. 10 (a), (b), (c). 11 is a sectional view showing a through hole of a fixing member, FIG. 11 shows a conventional friction lock device, FIG. 11 (a) is a front view, FIG. 11 (b) is a left side view, and FIG. 11 (c) is a right side view. The figure and the same figure (d) are the DD sectional views taken on the line (c). 1,12,20,30 ... Friction lock device, 2 ... Movable member, 3 ... Fixed member, 4,13,21,33,41,210,330 ... Shaft member, 41a, 210a, 330
a, 330b ... Knurl processing (rotation stop processing).

Claims (4)

[Scope of utility model registration request] 1. A shaft member which is inserted into a movable member and a fixed member, wherein one side portion of the shaft member is slidably inserted into the movable member in a rotationally restrained state and the other side. A friction lock device characterized in that a portion is press-fitted into a fixing member and a frictional force generated between the portion and the fixing member can be varied by the press-fitting length. 2. The friction lock device according to claim 1, wherein the shaft member is a solid shaft member such as a parallel pin or a taper pin or a shaft member that is bent in the radial direction. 3. The friction lock device according to claim 1, wherein the shaft member is provided with a rotation stopping process such as a knurl on the outer periphery of the movable member side insertion portion. 4. The friction lock device according to claim 1, wherein the insertion hole of the shaft member of the fixing member is a cylindrical hole, a stepped hole or a tapered hole.