JPH0893747A - Shaft lock device - Google Patents

Abstract

PURPOSE: To provide a shaft lock device which can make a fine adjustment of lock force by adjusting the lock force of the shaft lock device such as locking a rotating object member in a prescribed angle position. CONSTITUTION: A pressing member 10 composed of a lock nut 9 and a pushing screw to push-open a pitch of a coil spring 6 wound round a rotary member 2 of a shaft lock device 1 pivotally fixed to a rotating object member, is provided, and frictional torque force between the coil spring 6 and a rotary shaft 2 is changed, and lock force is adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft lock device used for an opening / closing member such as a panel display of a laptop type word processor, which can adjust a locking force for holding a predetermined inclination angle when opening / closing various kinds of opening / closing covers.

[0002]

2. Description of the Related Art Conventionally, in a laptop type word processor or the like, as shown in FIG.
On the other hand, the lid 101 is provided with a liquid crystal display unit on the inner surface thereof, and the pen 103 and keys are operated while the lid 101 is erected at a predetermined angle. Therefore, the shaft lock device 1 as shown in FIG. 12 is provided in the pivotal support portion 100 provided at both ends of the hinge portion of the lid 101.
Are arranged.

Such a shaft lock device is constructed as shown in FIGS. 12A to 12D, FIG. 12B is a plan view, FIG. 12D is a front view, and FIG. 12A is a side view, and FIG. 12A is a sectional view taken along the line CC of FIG. 12C. In each of these drawings, one side end of the rotary shaft 2 is formed with a connecting portion 2a that is cut in parallel, and the connecting portion 2a is fitted in a lid 101 which is a member to be rotated and which has, for example, the display portion of the word processor described above. It is inserted and fixed.
The other end of the rotary shaft 2 is formed as a small diameter portion, and the fixed bracket 3
It is loosely fitted in the inner diameter of the fixed bearing 4 fixed to and is rotatable.

In the fixed bracket 3, cut and raised pieces 3a and 3b formed by bending a plate material into a U-shaped cross section form a bearing portion. The outer diameter of the fixed bearing 4 is supported by the cut-and-raised piece 3b in a cantilever manner. The outer diameter of the fixed bearing 4 is selected to be the same as the large diameter portion of the rotary shaft 2.

The coil spring 6 is wound such that the inner diameter portion thereof is selected to be smaller than the outer diameter of the fixed bearing 4 and the rotary shaft 2 loosely fitted in the fixed bearing, and the coil spring 6 is wound around the outer diameter of the rotary shaft 2 and the fixed bearing 4. To be in close contact. The collar 5 is a washer fitted on the rotary shaft, and the C-shaped collar ring 7 serves to prevent the rotary shaft 2 from coming off.

The above-described conventional shaft lock device has the rotary shaft 2
When the rotating body 100 rotates with the rotation of the rotating body 100 and a rotational direction force acts to reduce the coil inner diameter of the coil spring 6, the rotating body 100 is predetermined by the friction torque acting between the coil spring 6 and the rotating shaft 2. When a lock torque that locks the closed position of the angle is generated and a rotational direction force that expands the coil inner diameter of the coil spring 6 is applied, a slip torque is generated between the coil spring 6 and the rotation shaft 2, and the rotating body is rotated. It is easy to close the lid of 100.

The above-mentioned lock torque is selected to be larger than the slip torque.

[0008]

According to the structure of the conventional shaft lock device 1 described above, the coil spring 6 and the rotary shaft 2 are previously formed.
Since the lock force is determined by the frictional force generated between the lock member and the lock member, there is a problem that the lock force cannot be adjusted after the lock member is incorporated in and attached to a mechanical device such as a rotated member.

An object of the present invention is to provide a shaft locking device which solves the above-mentioned problems, and an object of the present invention is to provide a coil spring pressing member as a locking force adjusting means capable of locking and adjusting the shaft locking device. Axis lock device alone,
Alternatively, the present invention intends to obtain a shaft locking device whose locking force can be adjusted arbitrarily even after the shaft locking device is attached to a device such as a rotated body.

[0010]

A shaft locking device of the present invention, as shown in FIG. 1, shows a coil spring 6 densely wound around a rotary shaft 2 pivotally mounted on a member to be rotated, In a shaft lock device 1 comprising a fixed bracket 3 on which the rotary shaft 2 is pivotally mounted, a coil spring 6 wound around the rotary shaft 2 is provided.
Is provided with a pressing member 10 for expanding the pitch.

[0011]

The coil spring 6 closely wound around the outer diameter portion of the rotary shaft 2 and the fixed bearing used in the shaft lock device of the present invention.
The coil spring 6 which is in close contact with the rotating shaft 2 by pressing the pressing member 10 so as to expand its pitch.
The inner diameter of the coil spring 6 becomes smaller by pushing the pitch of the coil spring 6 wider, and the dimensional difference between the outer diameter of the rotating shaft 2 and the inner diameter of the coil spring 6 changes to change the close contact amount of the coil spring 6 that is in close contact with the rotating shaft 2. With this configuration, it is possible to easily adjust the locking force with the shaft locking device alone or with the shaft locking device attached to the device, and to expand the control range.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a shaft lock device according to the present invention will be described in detail below with reference to FIGS. 1A to 1C are a side sectional view, a plan view and a side view showing a first embodiment of the present example. The parts corresponding to those of the conventional shaft lock device 1 described with reference to FIGS. 12 (A) to 12 (D) are designated by the same reference numerals.

As shown in FIGS. 1 (A) to 1 (C), the shaft lock device 1 of the present example is opened at a predetermined angle position during opening / closing operation of a display such as a laptop personal computer as a rotated body. Used to lock the display that was set up for viewing the display. The shaft lock device 1 is composed of a rotary shaft 2, a fixed bearing 4 which rotatably supports the rotary shaft 2, a coil spring 6 wound around the rotary shaft 2 in a close contact state, and a fixed bracket 3. There is.

The rotary shaft 2 is composed of a cylindrical body made of metal steel, and one end of the rotary shaft 2 is a connecting portion 2a which is cut in parallel to be fitted in and fixed to the rotating body 100, and the other end thereof. 2b is formed as a small diameter portion and is axially supported by the fixed bearing 4. That is, the small diameter portion 2b of the rotary shaft 2 is rotatably fitted in the inner diameter of the fixed bearing 4 formed in a cylindrical shape.

The bottom surface of the fixing bracket 3 is formed into a substantially rectangular shape, and four through holes for attaching the rotating body 100 to the main body 102 are provided. The cut-and-raised pieces 3a and 3b bent to the side surface form a bearing portion, and the cut-and-raised piece 3c bent to the front surface portion is a pressing member disposition portion. That is, a cut-and-raised piece 3a obtained by cutting and raising an iron plate or the like is provided with a through hole through which the large-diameter portion of the rotary shaft 2 can be inserted, and the through-hole serves as a bearing portion of the rotary shaft 2, and the cut-and-raised piece is further formed. A through hole is formed in 3b so that the small diameter portion of the rotary shaft 2 can be inserted therethrough. Further, a cylindrical fixed bearing 4 is fixed and integrated with the inside of the cut-and-raised piece 3b, that is, on the surface side facing the cut-and-raised piece 3a. Therefore, the fixed bearing 4 is cantilevered by the cut-and-raised piece 3b. The small-diameter portion of the rotary shaft 2 is rotatably inserted into the inner diameter of the fixed bearing 4, and the large-diameter portion is also inserted into the cut-and-raised piece 3a so that the rotary shaft 2 is rotated by the fixed bearing 4 and the cut-and-raised piece 3a. Be pivoted as possible. A washer or a collar 5 is fitted into the small diameter portion 2b of the rotary shaft 2, and the rotary shaft 2 is prevented from coming off by a collar ring 7 made of a C-shaped ring or the like.

A push screw 8 is attached to the cut-and-raised piece 3c bent to the front surface.
A through hole for inserting the hole is formed at a position facing the center position of the diameter of the rotary shaft 2, and a tap stand for screwing with the set screw 8 is formed. Reference numeral 9 is a lock nut for locking the push screw 8.

The coil spring 6 is wound so that its inner diameter is smaller than the outer diameter of the rotary shaft 2 and the outer diameter of the fixed bearing 4 in a free state. When the coil spring 6 is inserted through these shafts, it is expanded and inserted. To be done. For this reason, the coil spring 6 externally inserted is configured such that the inner diameter of the coil is in close contact with the rotary shaft 2 and a predetermined friction torque force can be applied.

According to the shaft lock device 1 having the above-described structure, the lock nut 9 screwed onto the set screw 8 is loosened to fix the set screw 8 even after the set screw is attached to the rotated member or before being attached. When the internal thread formed on the cut-and-raised piece 3c is screwed and rotated, the tip of the set screw 8 contacts the outer diameter of the coil spring 6 as shown in FIGS. 2 (A) and 2 (B), and further rotates. Then, the winding pitch of the coil spring 6 can be expanded. In this state, the lock nut 9 is brought into contact with the cut-and-raised piece to fix the push screw 8.

According to the operation of the pressing member 10, the pitch of the coil spring 6 is expanded by the thickness of the set screw 8 and is displaced toward the rotary shaft 2 side, so that the inner diameter of the coil spring 6 is reduced and the tightening margin is increased to increase the torque. The force is increased, and the torque force adjustment can be adjusted even after the set is assembled.

Another embodiment of the shaft lock device 1 of the present invention will be described with reference to FIGS. 3 (A) and 3 (B). 3A is a side view and FIG. 3B is a front view. In this example, the fixing bracket 3 has the same structure as that shown in FIGS. 12A to 12D of the related art. . As described above, the pressing member 10 is detachably attachable to the shaft locking device already attached to the laptop personal computer or the like, and the L metal fitting 11 bent in the L shape is formed with a female screw to be pushed. Pressing member 10 in which screw 8 and lock nut 9 are screwed together
Is fixed to the fixed bracket 3 with the set screw 12.

FIGS. 4 (A) and 4 (B) show still another configuration example of the present invention, which is obtained by improving the structure described in FIGS. 1 (A) to 1 (C). 4 (A) is a side view and FIG. 4 (B) is a sectional view.
Left and right and front and rear cut-and-raised pieces 3a, 3b, 3c, 3d are formed on the front and rear cut-and-raised pieces 3a and 3d.
Nos. 0 and 10a are provided, and the set screws 8 and 8a constituting the pressing members 10 and 10a are arranged so as to face the coil spring 6 wound around the rotary shaft 2, so that the coil spring 6 is provided. The amount of movement of the pitch can be increased, and the pitch can be spread more uniformly than in the configuration of FIGS. 1A to 1C, so that the torque adjustment allowance is reduced and finer torque adjustment is possible. be able to.

A side view and a plan view of this embodiment shown in FIGS. 5A and 5B show the attachable pressing member explained in FIGS. 3A and 3B as shown in FIG. 4A. As in (B) and (B), a plurality of such pressing members are attached, and attachment of such a plurality of pressing members is applicable to FIGS. 6 to 10 described later. In this example, a pressing member 10a having the same structure as the front surface of the fixed bracket 3 is attached to the rear of the fixed bracket 3 with set screws 12a and 12a, and a push screw 9 is attached.
And 9a are arranged so as to face the center line of the coil spring 6.

FIG. 6 shows still another configuration example of the present invention. In the case of this example, as shown in the side view of FIG. 6 (A) and the sectional view of FIG. 6 (B), the push nut 8 is attached to the tip of the push screw 8 in order to further increase the push-spreading amount of the coil spring 6, that is, the pitch. In this case, the pitch is further widened as compared with the case where only the set screw 8 is used, and torque adjustment with a larger adjustment allowance becomes possible. Such a method of attaching a nut to the tip of the push screw 8 can be applied to all shaft locking devices except FIG.

A sixth embodiment of the shaft lock device of the present invention is shown in FIGS. 7 (A) and 7 (B). FIG. 7 (A) is a side view and FIG. 7 (B) is a front view. In the present example, the position of the set screw 8 is located upward, and the present invention is applied to the shaft lock device 1 having a small hinge installation space width. be able to. In the configuration of this example, the plate member is bent so that the cut-and-raised pieces 3a and 3b of the fixed bracket 3 are bridged to have a U-shaped cross section, and the bent piece 15a is formed.
Female screws are formed on the bracket 15 on which the lock springs 15 and 15c are formed, the push screw 8 with which the lock nut 9 is screwed is screwed, and the tip end of the push screw 8 presses the coil spring 6 from the upper side of the coil spring 6. It is designed so that it spreads out so as to have a predetermined pitch. A bracket rotation stop portion 15c is formed on the left and right sides of the lower end of the bent piece 15a so as to lock the left and right walls of the cut and raised piece 3a of the fixed bracket 3.

A seventh embodiment of the shaft lock device of the present invention is shown in FIGS. 8 (A) to 8 (D). In this embodiment, the wedge plate is tightened with a band to widen the pitch of the coil spring, and the torque adjustment range is determined by the band width, and the degree of freedom of the adjustment range can be increased.

8A is a sectional view, FIG. 8B is a plan view, FIG. 8C is a side sectional view, and FIG. 8D is an enlarged view of part A of FIG. 8A. There is. As shown in each figure, the coil spring 6 closely wound around the rotary shaft 2 and the fixed bearing 4.
The band 17 formed into a substantially Ω shape is wound on the outer diameter of the. Wedge plates 16, 16 ... Which push and expand the pitch of the coil spring 6 are fixed inside the band 17 (see FIG. 8).
(See (D)), the wedge plate 16 is inserted between the lines of the coil spring 6 to expand the pitch. In addition, the rising portions at both ends of the band 17 are configured so that the tightening amount can be adjusted with a tightening screw.

FIG. 9A shows another embodiment of the present invention.
And FIG. 9B shows a plan sectional view and a side sectional view of the eighth embodiment.
An example will be described. In the case of this example, the coil spring contact portion of the rotary shaft 2 is formed as the taper portion 18 so that the amount of change in torque is large even if the amount of pitch movement of the coil spring 6 is small. That is, the rotary shaft 2 has a tapered portion 18
The configuration is the same as that of each of the above-described embodiments except that the outer diameter is increased and the large-diameter portion is axially supported by the cut-and-raised pieces 3a.

A ninth embodiment of the present invention is shown in FIGS. 10 (A) to 10 (C). FIG. 10A is a plan sectional view, FIG.
10B is a plan view, and FIG. 10C is a side view. In this example, a groove hole 19 is formed in the cut-and-raised piece 3c in front of the fixed bracket 3, and a square screw or nut 21 is formed in the groove hole 19. Is slidably arranged to the left and right, the saddle plate 20 bent in a U shape and having a through hole is covered from the upper side of the cut-and-raised piece 3c, and the push screw 9 screwed with the lock nut 9 is attached to the saddle plate 20. Since the end of the set screw 9 is brought into contact with the coil spring 6 by being screwed into the through hole and the square screw 21, the pressing member 10 can be moved left and right by an amount corresponding to the length of the slot hole. Since the pressing position can be finely adjusted, the coil spring can be expanded at any position and the shaft lock device capable of changing the torque amount can be obtained.

[0029]

As described in detail above, according to the shaft locking device of the present invention, the locking force can be adjusted even after the shaft locking device is attached to the hinge part of an electronic device such as a personal computer, so that it can be loosened. The effect can be exerted for adjustment and the like. Therefore, it is possible to expand the range of the lock force control of the rotated body.

[Brief description of drawings]

FIG. 1 shows an embodiment of a shaft locking device of the present invention,
(A) is a side sectional view, (B) is a plan view, and (C) is a side view.

FIG. 2 illustrates the operation of the shaft locking device of the present invention (A).
Is a sectional view and (B) is a plan view.

FIG. 3 shows a second embodiment of the shaft locking device of the present invention,
(A) is a side view and (B) is a front view.

FIG. 4 shows a third embodiment of the shaft locking device of the present invention,
(A) is a side view and (B) is a sectional view.

FIG. 5 shows a fourth embodiment of the shaft locking device of the present invention,
(A) is a side view and (B) is a plan view.

FIG. 6 shows a fifth embodiment of the shaft locking device of the present invention,
(A) is a side view and (B) is a sectional view.

FIG. 7 shows a sixth embodiment of the shaft locking device of the present invention,
(A) is a side view and (B) is a front view.

FIG. 8 shows a seventh embodiment of the shaft locking device of the present invention,
(A) is a sectional view, (B) is a plan view, (C) is a side sectional view,
FIG. 8D is an enlarged view of part A of FIG.

FIG. 9 shows an eighth embodiment of the shaft locking device of the present invention,
(A) is a plan sectional view and (B) is a side sectional view.

10A and 10B show a ninth embodiment of the shaft locking device of the present invention, in which FIG. 10A is a plan sectional view, FIG. 10B is a plan view, and FIG.

FIG. 11 is an explanatory diagram of a display device in which a conventional axis lock device is used.

FIG. 12 shows a conventional shaft locking device, where (A) is (C).
Is a cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

 1 axis lock device 2 rotation axis 3 fixed bracket 6 coil spring 8 push screw 9 lock nut 10 pressing member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Itsuo Yasuda 3 1170 Ako Ako, Komagane City, Nagano Prefecture

Claims (9)

[Claims] 1. A shaft lock device comprising a coil spring densely wound around a rotary shaft pivotally mounted on a rotatable member and a fixed bracket pivotally mounted on the rotary shaft, wherein the coil spring is wound around the rotary shaft. A shaft lock device comprising a pressing member for expanding the pitch of a coil spring. 2. The shaft locking device according to claim 1, wherein the pressing member is a pressing screw screwed to the fixing bracket. 3. The shaft lock device according to claim 1, wherein the pressing member is a tightening band provided with a wedge portion wound around an outer diameter of the coil spring. 4. The shaft lock device according to claim 1 or 2, wherein the pressing member is detachably arranged on the fixing bracket. 5. The shaft locking device according to claim 1, wherein the pressing member is a push nut screwed with a push screw screwed to the fixed bracket. 6. The pressing member is slidably attached to the fixing bracket so that the pressing position of the coil spring can be adjusted.
The shaft lock device according to any one of claims 1 to 5. 7. The shaft lock device according to claim 1, wherein a plurality of the pressing members are arranged. 8. The shaft locking device according to claim 1, wherein the pressing member is pressed from the front side, the rear side, or the upper side of the fixed block. . 9. The shaft lock according to claim 1, wherein a diameter of a rotating shaft around which the coil spring pressed by the pressing member is wound is partially changed. apparatus.