JPH0577615U - Axis locking device - Google Patents

Abstract

(57) [Summary] [Structure] An external shaft 2 having a tapered hole portion 6 and a tapered shaft portion 8 that fits into the hole portion 6 of the external shaft 2 and are rotatable relative to the external shaft 2. An inner shaft 3 provided,
It has an adjusting means 19 capable of adjusting the pressing force between the shaft portion 8 of the inner shaft 3 and the hole portion 6 of the outer shaft 2, and the hole portion 6 of the outer shaft 2 and the shaft portion 8 of the inner shaft 3 are The adjusting means 19 mutually generate a pressing force, and the pressing force causes a frictional resistance between them to lock the shaft. [Effect] Since a spring, a movable shaft of the same diameter, and a fixed shaft are not required, it is possible to reduce the size and weight and manufacture at low cost.
In addition, galling and the like will not occur.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an axis lock device used in, for example, a laptop personal computer or a word processor, and capable of fixing a position of a display panel with respect to a main body including a keyboard at an arbitrary angle.

[0002]

[Prior Art]

 Generally, the display panel of a laptop computer or word processor is normally stored in a closed state in a main body equipped with a keyboard and the like, and is used in an opened state from the main body. When using the display panel, it may be difficult to see the characters and pictures on the screen due to the fact that light such as lighting is reflected on the screen of the display panel depending on the conditions of use and place of use. The position can be fixed to the main body at any angle.

An example of a shaft locking device for fixing the position of the display panel at an arbitrary angle with respect to the main body is that disclosed in Japanese Utility Model Laid-Open No. 1-135397. This shaft locking device includes a movable shaft, a fixed shaft having the same diameter as the movable shaft and provided on both sides of the movable shaft, and a spring that is externally fitted to the movable shaft and the fixed shaft. When the movable shaft rotates to one side, the spring in the part that is externally fitted in close contact with one fixed shaft contracts the diameter to generate lock torque, and at the same time it is externally inserted in close contact with the other fixed shaft. The spring in the locked area expands to generate slip torque, and the sum of this lock torque and slip torque acts on the movable shaft to fix the position of the display panel at an arbitrary angle.

[0004]

[Problems to be solved by the device]

 However, in the shaft locking device with such a structure, the display disk is fixed in position at an arbitrary angle by the force of the spring, so the spring must have a certain diameter, and thus the shaft locking device can be made compact.・ There was a limit to weight reduction. Also, since it is necessary that springs be externally fitted in close contact with the movable shaft and the fixed shafts on both sides of the movable shaft that sandwich the large-diameter part in the center, the large-diameter part and both sides of the movable shaft must be fixed There was a problem that the manufacturing cost was high because the outer diameter of the shaft had to be substantially the same. The manufacturing cost increases as the shaft diameter decreases, which also makes it difficult to reduce the size and weight of the shaft locking device. In addition, the grease applied to the spring and the shaft may be dried due to long-term use and the like, and the shaft may be galled by the spring.

Therefore, an object of the present invention is to provide a shaft locking device that is small and lightweight, can be manufactured at low cost, and does not cause galling of the shaft.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, a shaft locking device of the present invention has an outer shaft having a tapered hole portion, and a tapered shaft portion that fits into the hole portion of the outer shaft. It is characterized in that it has an inner shaft provided so as to be rotatable relative to the shaft, and an adjusting means capable of adjusting the pressing force between the shaft portion of the inner shaft and the hole portion of the outer shaft.

[0007]

[Action]

 According to the shaft lock device of the present invention, the taper hole portion of the outer shaft and the taper shaft portion of the inner shaft exert a pressing force on each other by the adjusting means, and the pressing force causes a frictional resistance therebetween. become. Therefore, if a torque that exceeds the torque due to this frictional resistance is applied between the external shaft and the internal shaft, they will rotate relative to each other, and a torque that is less than the torque due to the frictional resistance will occur between the external shaft and the internal shaft. These will not rotate relative to each other.

Specifically, for example, the main body of the laptop type device is provided on the external shaft side, the display panel is provided on the internal shaft side, and the torque required to open and close the display panel is provided between the external shaft and the internal shaft. If the torque due to the frictional resistance between them is made larger and the torque due to the weight of the display board is made smaller than the torque due to the frictional resistance, the display board can be fixed in position at an arbitrary angle.

[0009]

【Example】

 A shaft locking device according to an embodiment of the present invention will be described below with reference to FIGS. 1 is a partially sectional front view of this embodiment, FIG. 2 is a plan view of this embodiment, and FIG. 3 is a side view of this embodiment.

In the figure, reference numeral 1 denotes the shaft locking device of the present embodiment, reference numeral 2 denotes an outer shaft, and reference numeral 3 denotes an inner shaft provided inside the outer shaft 2 so as to be rotatable relative to each other. The inner shaft 3 is made of plastic such as polyacetal.

The outer shaft 2 has a bottomed cylindrical shape with an opening on one side, and a bottom surface portion 4 thereof is integrally formed with an arm portion 5 extending upward from the outer shaft 2 shown in FIG. Further, the hole 6 has a taper shape in which the diameter decreases as it approaches the bottom surface portion 4, and a through hole 7 having a diameter smaller than the bottom surface of the hole portion 6 is provided in the center.

The inner shaft 3 has the same taper angle as that of the hole 6 of the outer shaft 2 and the bottom surface 9 on the maximum outer diameter side of the shaft 8 shown in FIG. The arm portion 10 extends upward as shown. Further, a through hole 11 having substantially the same diameter as the through hole 7 is provided at the center thereof, and an insertion hole 12 having a diameter larger than the through hole 11 by a predetermined amount is provided on the bottom face 9 side of the through hole 11. ing.

Then, the screw member 13 is inserted from the insertion hole 12 side of the inner shaft 3 into both the through holes 7 and 11 of the outer shaft 2 and the inner shaft 3 which are fitted to each other in the hole 6 and the shaft 8. Has been done. A plurality of (three in the illustrated example) elastic members 16 are inserted following the washer 15 on the head 14 side at one end of the screw member 13, and the washer 15 and the elastic member 16 have the screw member 13 It is provided in the insertion hole 12 of the inner shaft 3 by being inserted at a predetermined position. A screw portion 17 at the other end of the screw member 13 projects outward from the bottom surface portion 4 of the outer shaft 2, and a nut 18 is screwed into the screw portion 17. Then, by tightening the screw member 13 and the nut 18 with a predetermined torque, the tapered hole portion 6 of the outer shaft 2 and the tapered shaft portion 8 of the inner shaft 3 generate a pressing force to each other. The screw member 13, washer 15, elastic member 16 and nut 18 compose the adjusting means 19 of this embodiment, and the elastic member 16 is provided for the purpose of increasing the pressing force. Therefore, a spring or the like can be used instead.

In the shaft lock device 1 having the above structure, for example, a main body of a laptop device (not shown) is provided on the external shaft 2 side via the arm portion 5, and a display board (not shown) is provided via the arm portion 10. When the display board is opened and closed with respect to the main body by the adjustment means 19, the external shaft 2 and the internal shaft 3 exert a pressing force on each other. Will cause frictional resistance. Here, when the torque required to open and close the display board becomes larger than the torque due to this frictional resistance, the display board opens and closes while rotating the outer shaft 2 and the inner shaft 3 relatively. If the opening and closing torque is removed to fix the display board, only the torque for closing the outer shaft 2 and the inner shaft 3 due to the weight of the display board acts on the outer shaft 2 and the inner shaft 3. The torque will be smaller than the torque due to, and the position will be fixed at an arbitrary angle.

The shaft locking device 1 of the present embodiment uses the screw member 13 of the adjusting means 19 and the nut so that the display board can be easily opened and closed by the force of a person and is not closed by the weight of the display board. The tightening torque with respect to 18 is appropriately set so that an appropriate pressing force is generated between the tapered hole portion 6 of the outer shaft 2 and the tapered shaft portion 8 of the inner shaft 3.

Here, in the above-described embodiment, the structure in which the main body of the laptop type device is provided on the outer shaft 2 side and the display board is provided on the inner shaft 3 side has been described as an example. It is also possible to adopt a structure in which the inner shaft 3 is provided in reverse. Further, the present application is not limited to the laptop device and can be applied to various objects.

[0017]

[Effect of the device]

 As described above in detail, according to the shaft locking device of the present invention, the adjusting means causes a pressing force to be generated between the tapered hole portion of the outer shaft and the tapered shaft portion of the inner shaft, and the pressing force respectively Since frictional resistance is generated between these shafts and these shafts are locked, there is no need for springs, movable shafts with the same diameter, and fixed shafts, which enables downsizing and weight reduction, and low cost manufacturing. , No galling will occur.

[Brief description of drawings]

FIG. 1 is a partially sectional front view of a shaft locking device according to an embodiment of the present invention.

FIG. 2 is a plan view of a shaft locking device according to an embodiment of the present invention.

3A and 3B are side views of a shaft locking device according to an embodiment of the present invention, where FIG. 3A is a left side view of FIG. 2 and FIG. 3B is a right side view of FIG.

[Explanation of symbols]

 1 Shaft Lock Device 2 External Shaft 3 Inner Shaft 6 Hole 8 Shaft 19 Adjusting Means

Claims (1)

[Scope of utility model registration request] 1. An inner shaft having a tapered hole portion, an inner shaft having a tapered shaft portion that fits into the hole portion of the outer shaft and rotatably provided to the outer shaft, A shaft locking device, comprising: an adjusting unit capable of adjusting a pressing force between the shaft portion of the shaft and the hole portion of the external shaft.