JP2002040556A - Adjustable leg device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adjustable leg device improved to perform coarse adjustment by easy operation while using a general standard screw. SOLUTION: This adjustable leg device for adjusting the height or the angle of a projector is constituted of a leg member having a grounding end (3) and a shaft part (5) extended from the grounding end, casing (2) equipped with a hole through which the shaft part is inserted, a lock member (10) sliding in the casing so that it can move to contact with/separate from the shaft part, an energizing means (9) energizing the lock member in a direction where the lock member press-contacts with the shaft part, an operation member (6) exerting force to displace the lock member in a direction where the lock member is separated from the shaft part, and a force transmitting means (18) for transmitting the force exerted on the operation member to the lock member. Thus, the position of the shaft part is held usually by press-contacting force exerted on the lock member ordinarily and by operating the operation member so that the lock member is separated from the shaft part, the position of the shaft part is freely adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adjusting leg device for adjusting, for example, the optical axis angle of a projector and the level of a desk top.

[0002]

2. Description of the Related Art In order to adjust the optical axis angle of a projector and the horizontality of a desk top, it is common practice to incorporate screw means for converting rotational displacement into length displacement into legs. The lifting stroke of the height adjusting leg is determined by the relative rotation angle between the female screw and the male screw.

[0003]

However, for example, IS
The screw standard represented by the O standard is a lead angle that can obtain a friction angle that emphasizes stationary support of large loads. Therefore, the stroke per rotation is required for the height adjustment leg as described above. Although small and suitable for fine adjustment, quick adjustment has been unsatisfactory.

Although it is conceivable to appropriately set the lead angle of the screw as desired, the use of a special screw which is not standard has many disadvantages in terms of compatibility and workability. Hard to say.

[0005] The present invention has been devised to solve such problems of the prior art, and its main objects are as follows.
It is an object of the present invention to provide an improved adjustment leg device that can perform a coarse adjustment with a simple operation using a screw of a general standard.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, the structure of an adjusting leg device for adjusting the height or angle of a projector or the like is changed to a grounding end (embodiment). And a casing (2) having a hole (4) through which the shaft portion is inserted, and a leg member having a shaft portion (the screw shaft 5 in the embodiment) extending from the grounding end in the embodiment. A lock member (10) slidably fitted to the casing so as to be able to move toward and away from the shaft portion; ), An operating member (operating lever 6 in the embodiment) for applying a force for displacing the lock member in a direction to separate the lock member from the shaft portion, and a force transmission for transmitting the force applied to the operating member to the lock member. Means (the cam mechanism 18 in the embodiment). And it shall be characterized in that.
According to this, the position of the shaft portion is normally held by the pressing force applied to the lock member. Then, by operating the operation member to separate the lock member from the shaft portion, the position of the shaft portion can be freely adjusted.

According to a second aspect of the present invention, the force transmitting means having the above-mentioned structure is a cam mechanism for converting a rotational movement of the operating member into a linear movement of the lock member. Thereby, the operation of separating the lock member from the shaft can be simplified. In this case, if the configuration of claim 3 is adopted, that is, if the rotation axis of the operation member is orthogonal to the axis of the shaft portion, the direction of the operation force can be made to coincide with the direction of the load applied to the leg member.

[0008] In addition, in claim 4, a holding means for holding the lock member at a position separated from the shaft portion is provided. Thus, the free state of the shaft portion can be maintained even when the hand is released from the operation member.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows the entirety of an adjusting leg device constructed according to the present invention. The adjusting leg device 1 is fixed to the bottom of a housing of a device such as a projector. The casing 2 is fixed to the housing, and a grounding leg 3 is attached to a lower end thereof. A screw shaft 5 inserted into the inserted vertical hole 4 and an operation lever 6 for releasing a locked state of the screw shaft described later are provided.

As shown in FIGS. 2 and 3, the casing 2 has a rectangular cylindrical shape with its central axis extending in the horizontal direction, and has one end side slidable in the vertical direction. A vertical hole 4 through which the screw shaft 5 is inserted is provided. A horizontal guide hole 7 is formed in the casing 2, and a slide block 8 is slidably held therein.
The slide block 8 is resiliently urged by a compression coil spring 9 which is in close contact with the end wall of the guide hole 7.

A semicircular lock member 10 having a female screw 10 a corresponding to the male screw 5 a of the screw shaft 5 abuts on the screw shaft 5, and the lock member 1 contacts the male screw 5 a of the screw shaft 5.
The engagement of the 0 female screw 10a restricts the axial displacement of the screw shaft 5. The screw shaft 5 is prevented from coming off the casing 2 by an E-ring 11 fitted to the upper end thereof.

A horizontal shaft 12 extends from the back surface of the lock member 10, and the slide block 8 is integrally connected to its free end. That is, the lock member 10
Is movable in the horizontal direction in the casing 2 together with the slide block 8, and is resiliently urged by a compression coil spring 9, whereby the female screw 10a of the screw shaft 5 always meshes with the female screw 10a.

A central boss 13 integrally formed with the operation lever 6 is fitted to the horizontal shaft 12 of the lock member 10. The center boss 13 is engaged with a slot 14 of the casing 2 with a projection 15 so as to be immovable in the axial direction and rotatable within a predetermined angle range, and is rotated by operating the operation lever 6 protruding from the casing 2. It can move.

As shown in FIGS. 4 and 5, a cam mechanism 18 comprising a plurality of triangular ridges 16 and 17 equally spaced in the circumferential direction is provided at an axially opposed portion between the slide block 8 and the center boss 13. Is provided. The ridges 16 and 17 of the slide block 8 and the center boss 13 are fitted to each other without any gap (see FIG. 4).

Next, the operation of the apparatus of the present invention will be described.

Normally, since the lock member 10 is pressed against the screw shaft 5 by the resilient force of the compression coil spring 9 applied to the slide block 8, the female screw 10a of the lock member 10 meshes with the male screw 5a of the screw shaft 5. In state. Therefore, by rotating the screw shaft 5, an axial displacement amount corresponding to the rotation angle determined by the lead angle of the screw is given to the screw shaft 5.

When the operating lever 6 is pushed up to rotate the center boss 13, the cam ridge 16 on the slide block 8 side is inclined on the slope of the cam boss 17 on the center boss 13 which cannot move in the axial direction.
The slide block 8 moves to the left while compressing and compressing the compression coil spring 9 (see FIG. 5). As the slide block 8 is displaced leftward, the lock member 10 integrally connected to the slide block 8 is displaced leftward.

Thus, the female screw 10 of the lock member 10
Since a is separated from the external thread 5a of the screw shaft 5, the screw shaft 5 becomes free. If the position of the screw shaft 5 in the axial direction is appropriately set and the operating lever 6 is returned again, the locking member 10 presses the female screw 10 a against the male screw 5 a of the screw shaft 5 by the pressing force of the compression coil spring 9. The shaft 5 cannot move in the axial direction and its position is maintained.

In this state, if the screw shaft 5 is rotated,
Since the screw shaft 5 is displaced in the axial direction according to the lead angle of the screw, fine adjustment similar to that of a normal adjusting leg can be performed.

If the rotation shaft of the operation lever 6 is perpendicular to the axis of the screw shaft 5 as described above, the direction of the operation force for unlocking the screw shaft 5 is the direction of the load applied to the ground leg 3. Therefore, there is no need to apply a useless force to adjust the height.

Further, the cam mechanism 18 is connected to the triangular peaks 16.
With the configuration of 7, the operation stroke of the operation lever 6 can be set appropriately without changing the pressing force of the lock member 10 against the screw shaft 5 only by changing the inclination angle of the cam ridge.

As shown in FIGS. 6 and 7, the tops of the cam ridges 16 and 17 are cut off to provide flat bearing surfaces 16a and 17a perpendicular to the axial direction, and the operation lever 6 is fully rotated. Sometimes, if the flat surfaces 16a and 17a at the tops of the cam ridges are in contact with each other, the slide block 8 is not pushed back even if the hand is released from the operation lever 6, so that the screw shaft 5
Can be maintained in a free state. When the operating lever 6 is slightly returned to release the contact between the flat surfaces 16a and 17a at the top of the cam ridge, the ridge and valley of the two naturally fit together and the slide block 8 is pushed out.

[0024]

As described above, according to the present invention, the locked state and the unlocked state of the leg in the axial direction can be selected by a simple operation, so that the coarse adjustment and the fine adjustment can be easily switched. Therefore, a great effect can be achieved in improving the usability of the adjusting leg device.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of the apparatus of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG. 1;

FIG. 4 is an operation explanatory view of a cam mechanism showing a locked state.

FIG. 5 is an operation explanatory view of a cam mechanism showing an unlocked state.

FIG. 6 is an operation explanatory view showing a locked state of another cam mechanism.

FIG. 7 is an operation explanatory view showing an unlocked state of another cam mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Adjusting leg device 2 Casing 3 Grounding leg 4 Vertical hole 5 Screw shaft 6 Operating lever 7 Guide hole 8 Slide block 9 Compression coil spring 10 Lock member 12 Horizontal shaft 13 Center boss 16 Cam ridge (slide block side) 17 Cam ridge (center) (Boss side) 18 Cam mechanism

Claims (4)

[Claims] An adjusting leg device for adjusting the height or angle of a projector or the like, comprising: a leg member having a ground end and a shaft extending from the ground end; and a hole through which the shaft is inserted. A casing provided with: a lock member slidably fitted to the casing so as to be able to move toward and away from the shaft portion; an urging means for urging the lock member in a direction of pressing against the shaft portion; and the lock member. An operating member for applying a force for displacing the operating member in a direction to separate the operating member from the shaft portion; and a force transmitting means for transmitting a force applied to the operating member to the lock member. . 2. The adjusting leg device according to claim 1, wherein the force transmitting means is a cam mechanism that converts a rotational motion of the operation member into a linear motion of the lock member. 3. The adjustment leg device according to claim 2, wherein a rotation axis of the operation member is orthogonal to an axis of the shaft portion. 4. The adjusting leg device according to claim 1, further comprising a holding means for holding the lock member at a position separated from the shaft portion.