JP4620226B2 - Adjustable leg device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an adjusting leg device for adjusting, for example, an optical axis angle of a projector and a level of a desk top plate.
[0002]
[Prior art]
In order to adjust the optical axis angle of the projector and the level of the desk top plate, a screw means for converting rotational displacement into length displacement is generally incorporated in the leg portion. Such a lifting stroke of the height adjusting leg is determined by a relative rotation angle between the female screw and the male screw.
[0003]
[Problems to be solved by the invention]
However, for example, the screw standard represented by the ISO standard has a lead angle that gives a friction angle that places importance on stationary support under heavy loads. The stroke is small and suitable for making fine adjustments, but is unsatisfactory for making quick adjustments.
[0004]
Although it is conceivable to set the lead angle of the screw appropriately as desired, using a special screw outside the standard has more disadvantages in terms of compatibility and workability, and it is a good idea. hard.
[0005]
The present invention has been devised to solve such problems of the prior art, and its main purpose is to enable rough adjustment by simple operation after using general-purpose screws. It is to provide an improved adjusting leg device.
[0006]
In order to achieve such an object, in the present invention, the configuration of the adjusting leg device for adjusting the height or angle of a projector or the like is extended from the grounding end (the grounding leg 3 in the embodiment) and the grounding end. a leg member having the shaft portion (screw shaft 5 in the embodiment) issued a casing (2) provided with a hole (4) for inserting the shaft portion, the first perpendicular to the axis of the shaft portion along the axis, against the away movably so as to the casing in sliding engagement lock members (10), biasing means for biasing in a direction to press the locking member to the shaft portion (carried out on the shaft portion A compression coil spring 9), and an operation member (operating lever in the embodiment) provided to the casing so as to be rotatable about the first axis and not displaceable in the first axis direction. 6), in response to rotation of said operating member, said biasing And it shall be characterized by having a cam mechanism (18) for separating from the shaft portion along the locking member against the biasing force of the stage to the first axis. According to this, the position of the shaft portion is normally held by the pressure contact force applied to the lock member. Then, the position of the shaft portion can be freely adjusted by operating the operation member to separate the lock member from the shaft portion. Further, the operation of separating the lock member from the shaft portion can be simplified. Further, the direction of the operating force can be matched with the direction of the load applied to the leg member.
[0007]
Further, the lock member includes a lock member shaft portion (horizontal shaft 12 in the embodiment) that extends along the first axis from a portion opposite to the portion that contacts the shaft portion in the first axial direction. A block portion (slide block 8 in the embodiment) provided at the tip of the lock member shaft portion, and the biasing means is a compression coil spring (9), and the casing and the block portion The block portion is urged toward the shaft portion along the first axis, and the operation member is rotatably supported by the lock member shaft portion, and the casing The cam mechanism is formed so as to be immovable in the first axial direction, and the cam mechanism is formed at portions of the operating member and the block portion that are opposed to each other in the first axial direction, and engages with each other. Mountain (16 Characterized in that it comprises 17).
[0008]
In addition, and it intended to comprise a holding means for holding the lock member in a position spaced from the shaft portion. Thereby, even if a hand is released from an operation member, the free state of a shaft part can be maintained. Each of the operation member and the cam crest of the block portion is provided with a flat surface (16a, 17a) orthogonal to the first axis at the top in the first axial direction, The flat surface of the cam crest of the operation member and the flat surface of the cam crest of the block portion are in contact with each other at a predetermined rotational position of the operation member in which the lock member is separated from the shaft portion. The lock member is held at a position separated from the shaft portion.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
[0010]
FIG. 1 shows the entirety of an adjusting leg device constructed according to the invention. This adjusting leg device 1 is fixed to the bottom of a casing of a device such as a projector, and is provided in the casing 2 with a casing 2 fixed to the casing and a grounding leg 3 attached to the lower end thereof. The screw shaft 5 inserted through the vertical hole 4 and an operation lever 6 for releasing the lock state of the screw shaft described later are provided.
[0011]
As shown in FIGS. 2 and 3, the casing 2 has a rectangular tube shape with its central axis extending in the horizontal direction, and at one end thereof, the screw shaft 5 is slidable in the vertical direction. A vertical hole 4 is provided to pass through. A horizontal guide hole 7 is formed in the casing 2, and a slide block 8 is slidably held. The slide block 8 is elastically biased by a compression coil spring 9 which is compressed and contacted with the end wall of the guide hole 7.
[0012]
The screw shaft 5 comes into contact with a semicircular lock member 10 formed with a female screw 10a corresponding to the male screw 5a of the screw shaft 5, and the female screw 10a of the lock member 10 meshes with the male screw 5a of the screw shaft 5. The axial displacement of the screw shaft 5 is restricted. The screw shaft 5 is prevented from being detached from the casing 2 by an E-ring 11 fitted to the upper end thereof.
[0013]
A horizontal shaft 12 extends from the back surface of the lock member 10 and the above-described slide block 8 is integrally coupled to the free end thereof. That is, the lock member 10 can move in the casing 2 together with the slide block 8 in the horizontal direction, and is elastically biased by the compression coil spring 9, whereby the female screw 10 a is always engaged with the male screw 5 a of the screw shaft 5. It is matched.
[0014]
A central boss 13 formed integrally with the operation lever 6 is fitted to the horizontal shaft 12 of the lock member 10. The central boss 13 is engaged with the slot 14 of the casing 2 with a projection 15 so that the central boss 13 cannot move in the axial direction and can rotate within a predetermined angle range, and is rotated by the operation of the operation lever 6 protruding from the casing 2. It can move.
[0015]
As shown in FIGS. 4 and 5, a cam mechanism 18 composed of a plurality of triangular peaks 16 and 17 that are equally spaced in the circumferential direction is provided at the axially opposite portion between the slide block 8 and the central boss 13. ing. The ridges 16 and 17 of the slide block 8 and the center boss 13 are aligned with each other without a gap (see FIG. 4).
[0016]
Next, the operation procedure of the device of the present invention will be described.
[0017]
Normally, since the lock member 10 is pressed against the screw shaft 5 by the elastic force of the compression coil spring 9 applied to the slide block 8, the female screw 10a of the lock member 10 is engaged with the male screw 5a of the screw shaft 5. . 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.
[0018]
When the operation lever 6 is pushed up to rotate the central boss 13, the cam block 16 on the slide block 8 rides on the slope of the cam mount 17 on the side of the central boss 13 that cannot move in the axial direction. The spring 9 is moved to the left while being compressed (see FIG. 5). Along with the leftward displacement of the slide block 8, the lock member 10 integrally coupled to the slide block 8 is displaced to the left.
[0019]
Thereby, the female screw 10a of the lock member 10 is separated from the male screw 5a of the screw shaft 5, so that the screw shaft 5 becomes free. Therefore, if the axial position of the screw shaft 5 is appropriately set and the operation lever 6 is returned again, the lock member 10 presses the female screw 10a against the male screw 5a of the screw shaft 5 by the pressing force of the compression coil spring 9, so that the screw The shaft 5 cannot move in the axial direction, and its position is maintained.
[0020]
In this state, if the screw shaft 5 is rotated, the screw shaft 5 is displaced in the axial direction according to the lead angle of the screw, so that the same fine adjustment as that of a normal adjusting leg can be performed.
[0021]
If the configuration as described above, that is, the rotation axis of the operation lever 6 is orthogonal to the axis of the screw shaft 5, the direction of the operation force for releasing the lock of the screw shaft 5 opposes the direction of the load applied to the grounding leg 3. Therefore, it is not necessary to apply useless force to adjust the height.
[0022]
In addition, since the cam mechanism 18 is composed of triangular peaks 16 and 17, the operating lever 6 can be operated without changing the pressing force of the lock member 10 against the screw shaft 5 only by changing the inclination angle of the cam peaks. The operation stroke can be set appropriately.
[0023]
As shown in FIGS. 6 and 7, the tops of the cam ridges 16 and 17 are cut out to provide flat bearing surfaces 16a and 17a orthogonal to the axial direction. If the flat surfaces 16a and 17a at the top of the cam crest are brought into 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 free state of the screw shaft 5 can be maintained. If the operation lever 6 is returned a little to release the contact between the flat surfaces 16a and 17a at the top of the cam crest, the crests and troughs of both sides naturally fit together and the slide block 8 is pushed out.
[0024]
【The invention's effect】
As described above, according to the present invention, since the locked state and unlocked state of the axial position of the leg portion can be selected by a simple operation, it is possible to easily switch between coarse adjustment and fine adjustment, A great effect can be achieved in improving the usability of the adjusting leg device.
[Brief description of the drawings]
1 is an overall perspective view of the device of the present invention. FIG. 2 is a sectional view taken along line II-II in FIG. 1. FIG. 3 is a sectional view taken along line III-III in FIG. FIG. 5 is an operation explanatory diagram of the cam mechanism showing the unlocked state. FIG. 6 is an operation explanatory diagram showing the locked state of another cam mechanism. FIG. 7 is an unlocked state of another cam mechanism. Illustration of operation [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Adjustment leg apparatus 2 Casing 3 Grounding leg 4 Vertical hole 5 Screw shaft 6 Operation lever 7 Guide hole 8 Slide block 9 Compression coil spring 10 Locking member 12 Horizontal shaft 13 Center boss 16 Cam mountain (slide block side)
17 Mount Cam (center boss side)
18 Cam mechanism

Claims (4)

An adjusting leg device for adjusting the height or angle of a projector or the like,
A leg member having a grounding end and a shaft portion extending from the grounding end;
A casing having a hole through which the shaft portion is inserted;
A lock member slidably engaged with the casing so as to be movable toward and away from the shaft portion along a first axis perpendicular to the axis of the shaft portion;
An urging means for urging the lock member in a direction in pressure contact with the shaft portion;
An operating member provided for the casing that is rotatable about the first axis and is not displaceable in the first axis direction ;
And a cam mechanism for separating the locking member from the shaft portion along the first axis against the biasing force of the biasing means in response to the rotation of the operation member. apparatus. The lock member includes a lock member shaft portion extending along the first axis from a portion opposite to a portion in contact with the shaft portion in the first axial direction, and a distal end portion of the lock member shaft portion. Provided block part,
The urging means is a compression coil spring, provided between the casing and the block portion, urges the block portion toward the shaft portion along the first axis,
The operation member is rotatably supported by the lock member shaft portion, and engages with the casing so as not to move in the first axial direction.
2. The cam mechanism according to claim 1, wherein the cam mechanism includes cam crests that are formed at portions of the operation member and the block portion that are opposed to each other in the first axial direction, and that engage with each other. Adjusting leg device as described. The adjusting leg device according to claim 1 or 2, further comprising holding means for holding the lock member at a position spaced apart from the shaft portion. Each of the operation member and the cam crest of the block portion is provided with a flat surface perpendicular to the first axis at the top in the first axial direction, and the lock member is separated from the shaft portion. The flat surface of the cam crest of the operation member and the flat surface of the cam crest of the block portion are in contact with each other at a predetermined rotational position of the operation member in a separated state, and the lock member is The adjusting leg device according to claim 3, wherein the adjusting leg device is held at a position separated from the portion.

Images