JP4708825B2 - Tilt foot structure - Google Patents

Description

  The present invention relates to a tilt foot structure, and more particularly to a tilt foot structure capable of fine adjustment by rotation of a foot portion and free vertical movement of the foot portion.

  Conventionally, a projection projector is often projected upward from a low position onto a projection surface such as a screen or a wall. In order to project an image at a desired position based on the relative relationship between the projection projector and the projection surface, the projection projector is used. It was necessary to adjust the projection optical axis of the projector vertically and horizontally. The left and right sides can be adjusted by rotating the projection type projector to the left and right, but the upper and lower sides require lifting the projection side of the projection type projector.

  FIG. 7 is a schematic side view of the projection type projector. The projection projector 50 has an upper case 1 and a lower case 2, and a foot part 11 of a tilt foot is provided on the lower surface of the lower case 2 on the projection lens 40 side, and the screw is usually rotated by rotating the foot part 11. The vertical tilt angle of the projection projector 50 is adjusted by moving the projection projector 50 in and out of the lower case 2. Usually, it is provided on each of the left and right sides of the lower case 2 and cooperates with the rear fixed leg to adjust the inclination in the vertical direction and the rotation direction around the optical axis.

Also, a foot part that slides up and down without using a screw mechanism and a locking mechanism for the foot part are provided, and the locking mechanism is released and the foot part is moved up and down to a desired height and fixed by the locking mechanism In order to facilitate the operation, Patent Document 1 discloses a projection angle adjustment mechanism and a height adjustment mechanism in which an operation portion of a locking mechanism is provided on the upper surface of the case.
JP 2001-218130 A

  The conventional tilt foot structure using the screw mechanism can adjust the projection angle delicately. However, when adjusting, there is only a method of adjusting by rotating the foot portion 11 while holding the projection projector 50 with one hand, When the adjustment amount is large, it is necessary to rotate the heavy projection projector 50 while lifting it. Further, in the state where many foot portions 4 appear when the angle is adjusted, there is a problem that the distance from the engaging portion of the screw to the foot portion 4 becomes long and the tilt foot portion becomes loose.

  Further, the mechanism described in Patent Document 1 has a problem that the foot portion is easy to put in and out but delicate projection angle adjustment is not easy.

  An object of the present invention is to provide a tilt foot structure that can be easily adjusted even when the amount of adjustment is large and that allows fine adjustment of the projection angle.

The tilt foot structure of the present invention is
A tilt foot structure that protrudes from the lower surface of the device and raises and lowers a tilt foot portion that adjusts the tilt of the device. The tilt foot structure includes a shaft having a male screw and a foot portion. The inner surface has a female screw that can be screwed with the male screw, and the male screw and the female screw are screwed into each of the cylindrical holding block divided into two in the direction parallel to the axis of the shaft and the two divided holding blocks. A moving means for moving the position to a position where the male screw and the female screw are disengaged, and an operation button provided on the surface of the device for operating the moving means. The moving means has a member having a cylindrical surface surrounding the holding block, and the holding block is located near the lower end of the inner surface of the cylindrical surface. The inner diameter of the cylindrical surface of the cylindrical surface is aligned with the tapered portion, and when the outer surface excluding the tapered portion of the holding block comes into contact, the screwing of the female screw of the holding block and the male screw of the shaft is released, When the extended end of the taper part of the holding block comes into contact, the internal thread of the holding block is screwed with the male screw of the shaft, and the operation with the operation button makes the taper part of the holding block contact the cylindrical surface This is an operation of moving between a position where the taper portion of the cylindrical surface comes into contact with a position where the taper portion comes into contact.

  The holding block is a cylindrical structure divided into two parts surrounding the shaft. One end of the cylinder is sized to contact the periphery of the through hole of the tilt foot portion of the device, and the inner surface of the one end side has a shaft on the inner surface. A female screw that can be screwed with a male screw is provided, and a tapered portion is provided at the portion corresponding to the female screw on the outer surface of the cylinder, and the end opposite to the female screw is supported by a fixing pin so that it can be opened and closed. A support arm that is biased to the open side by the means and that extends horizontally on each upper part is provided, and the moving means surrounds the through hole of the tilt foot portion of the equipment and is fixed to the equipment so as to surround the holding block. An inner surface of the cylindrical structure, and a compression spring that is provided outside the cylindrical structure and compresses each support arm of the holding block in a direction away from the through hole. Maintenance A portion corresponding to the tapered portion of the block is provided with a tapered portion that abuts the tapered portion on the outside of the holding block in a state where the female screw of the holding block and the male screw of the shaft are released, and the upper portion of the holding block is provided at the upper portion. Cuts into which the support arms can be inserted may be provided.

  The portion of the inner surface of the holding block where the internal thread is not provided may be a curved surface that is close to the apex of the thread of the external thread when the internal thread is engaged with the external thread of the shaft.

  The operation button pushes down the support arm of the holding block against the pressing force of the compression spring so that the holding block is pushed down until the taper of the holding block is aligned with the taper of the inner surface of the cylindrical structure. The compression means may be a coil spring or may be any of an elastic synthetic resin and a rubber member.

  The compression spring may be a single coil spring that is provided so as to surround the outer periphery of the cylindrical structure, and each of the two coils biases the indicating arm across the outer periphery of the cylindrical structure. It may be a spring.

  Subtle height adjustment using the screwing of the male screw of the shaft and the female screw of the holding block by the rotation of the foot part, and a large height adjustment by freely moving the foot part up and down by releasing the screwing by pressing the operation button . Further, the shaft can be prevented from shaking due to the contact between the shaft and the holding block over a long distance.

The following effects of the present invention can be obtained. That is,
The first effect is that from a fine adjustment of the height to a large adjustment can be easily performed. This is because a screw mechanism and a slide mechanism can be selected.

  The second effect is that the degree of shakiness of the tilt foot portion is reduced even when the tilt foot portion protrudes frequently. This is because a cylindrical structural component that engages with the shaft of the tilt foot portion is provided.

  The third effect is that the tilt foot portion can be easily removed and the tilt foot portion can be easily replaced when it is damaged. This is because the engagement with the threaded portion of the tilt foot portion can be easily released and the tilt foot portion can be extracted.

  The tilt foot structure of the present invention is characterized in that it can easily perform from a fine adjustment of the height to a large adjustment.

  An embodiment of a tilt foot structure according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic partial exploded perspective view of a tilt foot structure according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the tilt foot structure shown in FIG. 3 is a cross-sectional view of the tilt foot structure of FIG. 1 in a state where the operation button is pressed. 4 is an enlarged sectional view of the tilt foot portion of FIG. 3, and FIG. 5 is an enlarged sectional view of the vicinity of the operation button of FIG.

  In the first embodiment, the tilt foot structure 100 is a height-adjustable support leg attached to a device and its adjustment mechanism. Here, the upper case of the projection projector 50 schematically shown in FIG. 1 and the related part of the lower case 2 are also included. Although the embodiment will be described as a tilt foot structure for a projection projector, the application is not limited to a projection projector, and it can be effectively used as a support leg for a device that requires height adjustment. Since the projection type projector itself is the same as the projection type projector 50 described with reference to FIG. 7 as a conventional example, FIG. 7 is quoted for description, and the same components are denoted by the same reference numerals.

  The tilt foot structure 100 of the projection projector 50 according to the present invention includes an upper case 1 and a lower case 2 of the projection projector 50, a tilt foot portion 10, and a lock mechanism 20 that locks and releases the tilt foot portion 10. The operation button 30 is provided on the upper case 1 and operates the lock mechanism. The lock mechanism 20 includes a holding block and moving means for moving each of the two divided holding blocks to a position where the male screw and the female screw are engaged with each other and a position where the male screw and the female screw are disengaged.

  The tilt foot portion 10 includes a shaft 12 having a male screw portion 12a on the outer periphery, and a foot portion 11 that is integrated with the shaft 12 and contacts the floor surface to support a load.

  The lock mechanism 20 includes a first movable block 21 and a second movable block 22 that are holding blocks, a fixed block 23 that is a moving means, a longitudinal compression spring 24, and a lateral compression spring 25.

  The fixed block 23 includes a cylindrical portion 23a and a base 23b that fixes the cylindrical portion 23a. The cylindrical portion 23a is provided by surrounding the through portion for the tilt foot portion 10 of the lower case 2 with the base 23b. The upper and lower guide grooves into which the arm portions 21a and 22b of the first movable block 21 and the second movable block 22 are inserted are opposed to each other, and a predetermined length is provided at the lower portion of the inner surface. A downwardly opening tapered portion is formed at a predetermined step.

  The first movable block 21 and the second movable block 22 are members of the same shape obtained by dividing a guide cylinder surrounding the shaft 12 into two in the vertical direction, and the shaft 12 is disposed inside the cylindrical portion 23 a of the fixed block 23. Are provided symmetrically with respect to each other. The two movable blocks 21 and 22 intersect with each other at the upper part and are fixed to be opened and closed by a fixing pin 26. When closed, the inner surface contacts the entire outer surface of the shaft 12. The two movable blocks 21 and 22 are pressed in the direction of opening to both sides around the fixed pin 26 by a lateral compression spring 25 provided at the lower part of the fixed pin 26. The inner surface is provided with a curved surface having a radius almost in contact with the top of the thread of the threaded portion 12a of the shaft 12 except for a predetermined length on the lower side. Female screw portions 21b and 22b that can be screwed with the screw portion 12a are provided respectively. Therefore, when the first movable block 21 and the second movable block 22 are closed, the screw portions 21b and 22b are screwed with the screw portion 12a of the shaft, and the upper cylindrical portion is in a state of guiding the screw portion 12a. When the outer surface is closed except for a predetermined length on the lower side, the outer surface is a curved surface having a gap with the inner surface of the cylindrical portion 23a, and a predetermined length provided on the lower portion of the cylindrical portion 23a is provided on the lower predetermined length. And a lower opening taper portion that can come into contact with the lower opening taper portion of a predetermined step and a lower end of the taper portion of the first movable block 21 and the second movable block 22 in the closed state. The distance between the tips of the first and second movable blocks 21 and 22 is approximately equal to the inner diameter of the cylindrical portion 23a. When the tapered portions of the first movable block 21 and the second movable block 22 are engaged with the tapered portion of the cylindrical portion 23a, The taper dimension is set so that the screw portions 21b, 22b of the first movable block 21, the second movable block 22 and the screw portion 12a of the shaft 12 are disengaged. Accordingly, in the state where the tips of the tapered portions of the first movable block 21 and the second movable block 22 are raised to the straight portion of the cylindrical portion 23a, the screw portion 12a of the shaft 12 is screwed with the screw portions 21a and 22a, and the first When the movable block 21 and the second movable block 22 are lowered until the tip of the taper portion abuts the taper portion of the cylindrical portion, the screwing of the screw portion 12a of the shaft 12 and the screw portions 21a and 22a is released. The

  Arm portions 21a and 22a provided in the first movable block 21 and the second movable block 22 are inserted into the vertical grooves of the cylindrical portion 23a. The lower surfaces of the arm portions 21a and 22a are held at one end by the base 23b of the fixed block 23 and the other ends of the vertical compression springs 24 surrounding the cylindrical portion 23a are in contact with each other. The movable block 22 is urged toward the operation button 30 by the vertical compression spring 24, and the respective arm portions 21 a and 22 a are in contact with the lower surface of the skirt portion 30 a of the operation button 30.

  Since the upper surfaces of the arm portions 21 a and 22 a of the first movable block 21 and the second movable block 22 are in contact with the lower surface of the skirt portion 30 a of the operation button 30, the first movable block 21 is depressed by pressing the operation button 30. The second movable block 22 descends inside the cylindrical portion 23 a against the urging force of the vertical compression spring 24. A force in the direction of opening the tip is applied to the first movable block 21 and the second movable block 22 by the lateral compression spring 25 provided below the fixed pin 26, and the outer side of each tip is on the cylindrical portion 22a. Contact the inner surface. The stroke of the operation button 30 is set to be longer than the taper length of the cylindrical portion 23 a, and the lowering of the first movable block 21 and the second movable block 22 is prevented by the tips thereof contacting the lower case 2. . Therefore, when the operation button 30 is not pressed, the tips of the first movable block 21 and the second movable block 22 are in contact with the straight cylindrical inner surface of the cylindrical portion 23a, and the screw portions 21b and 22b are the screw portions 12a of the shaft 12. Screwed together. When the operation button 30 is pressed, the outer surfaces of the distal ends of the first movable block 21 and the second movable block 22 descend the tapered portion of the inner surface of the cylindrical portion 23 a, and the first movable block 21 and the lower movable block 22 are in contact with the lower case 2. Since the lower taper part of the outer surface of the movable block 21 and the second movable block 22 is in contact with the taper part below the inner surface of the cylindrical part 23a, the screw parts 21b and 22b are opened to contact the screw part 12a of the shaft 12. The screwing is released. Accordingly, the tilt foot portion 10 can freely move up and down on the inner surfaces of the first movable block 21 and the second movable block 22. When the operation button 30 is returned, the first movable block 21 and the second movable block 22 start to rise due to the urging force of the vertical compression spring 24, and the tapered portion enters the straight cylindrical surface of the cylindrical portion 23a and the first The distal ends of the movable block 21 and the second movable block 22 move inward, and the screw portions 21b and 22b are screwed with the screw portion 12a of the shaft 12.

  When adjusting the projection angle of the tilt foot structure 100 of the projection projector 50 according to the present invention, when adjusting the subtle angle, the first movable block 21 and the second movable block 21 with the operation button 30 not depressed. The height is adjusted by turning the foot portion 11 by utilizing the relationship between the thread portion 21b of the internal thread formed on each inner surface of the block 22 and the thread portion 12a of the external thread formed on the shaft 12 to be screwed. it can.

  When making a larger adjustment, the operation button 30 is pushed down. As a result, the skirt portion 30a of the operation button 30 pushes down the arm portions 21a, 22a provided on the upper portions of the first movable block 21 and the second movable block 22, respectively. The second movable block 22 descends against the urging force of the vertical compression spring 24. The first movable block 21, which is pressed in the direction in which the lower portion is opened by the lateral compression spring 25 around the fixed pin 26, has a tapered portion of the lower opening on the outer surface of the lower portion of the second movable block 22. The lower part of the inner surface of 23a is lowered in a direction to come into contact with the tapered part of the lower opening. When the predetermined distance is lowered, the screw portion 12a of the shaft 12 and the screw portions 21b and 22b formed on the inner surfaces of the first movable block 21 and the second movable block 22 are unscrewed, so that the shaft 12 can freely move. It becomes possible to move up and down. Accordingly, if the projection projector 50 is held at a desired angle in advance, the opened foot portion 11 is lowered to the floor surface. Therefore, if the operation button 30 is opened there, the first movable block 21 and the second movable block 22, the screw portion 12a of the shaft 12 is screwed with the screw portions 21b and 22b formed on the inner surfaces of the first movable block 21 and the second movable block 22, respectively, and the foot portion 11 is fixed. Is done. In this case, since the foot portion 11 is raised by the strokes of the first movable block 21 and the second movable block 22, it is desirable to draw out the foot portion by that amount in advance. Thereafter, the height can be finely adjusted by rotating the foot portion 11.

  In addition, by operating the operation button 30 so that the operation button 30 is knocked while the foot portion 11 is separated from the floor, the operation of repeatedly releasing the screw portion 12a, lowering the foot portion 11 slightly, and being locked is repeated. The foot part 11 can be extended little by little.

  When the operation button 30 is not pressed, the inner surfaces of the first movable block 21 and the second movable block 22 other than the screw portions 21a and 22a are substantially in contact with the top of the screw thread of the screw portion 12a of the shaft 12. Therefore, even if a lateral force is applied to the foot part 11, the shaft 12 does not rattle and the foot part 11 is stabilized.

  The first movable block 21 and the second movable block 22 have been described as having a force acting to open outward around the fixed pin 26 by the lateral compression spring 25, but this spring is elastic. It may be replaced with a synthetic resin or a rubber member.

  Further, by installing the tilt foot structure 100 of the present invention on the left and right sides of the front side of the projection projector 50, the left and right inclination of the projection screen can be easily adjusted.

  Next, a second embodiment of the tilt foot structure according to the present invention will be described with reference to the drawings. FIG. 6 is a schematic partial exploded perspective view of a tilt foot structure according to a second embodiment of the present invention. Since the second embodiment is the same as the first embodiment except that the configuration of the longitudinal compression spring is different from that of the first embodiment, the same parts are denoted by the same reference numerals and names. The description is omitted.

  Similarly to the first embodiment, arm portions 21a and 22a provided in the first movable block 21 and the second movable block 22 are inserted into the vertical grooves of the cylindrical portion 23a. The other ends of the two vertical compression springs 27, one end of which is held by the base 23b of the fixed block 23, are fixed to the distal ends of the arms 21a and 22a, respectively, and the first movable block 21 and the second movable block 22 is urged toward the operation button 30 by the vertical compression spring 27, and the respective arm portions 21 a and 22 a are in contact with the lower surface of the skirt portion 30 a of the operation button 30. It may be a single spring surrounding the cylinder due to the arrangement relationship with other constituent members, or two springs for urging each supporting arm.

It is a typical fragmentary exploded perspective view of the tilt foot structure object of a 1st embodiment of the present invention. It is sectional drawing in the state in which the operation button of the tilt foot structure of FIG. 1 is not pressed. It is sectional drawing in the state in which the operation button of the tilt foot structure of FIG. 1 was pressed. It is an expanded sectional view of the tilt foot part of FIG. FIG. 4 is an enlarged cross-sectional view in the vicinity of the operation button in FIG. 3. It is a typical partial exploded perspective view of the tilt foot structure of a 2nd embodiment of the present invention. It is a typical side view of a projection type projector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper case 2 Lower case 10 Tilt foot part 11 Foot part 12 Shaft 12a, 21b, 22b Screw part 20 Lock mechanism 21 1st movable block 21a, 22a Arm part 22 2nd movable block 23 Fixed block 23a Cylindrical part 23b Base 24, 27 Vertical compression spring 25 Horizontal compression spring 26 Fixing pin 30 Operation button 30a Skirt portion 40 Projection lens 50 Projection type projector 100 Tilt foot structure

Claims (8)

A tilt foot structure that protrudes from the lower surface of the device and raises and lowers a tilt foot part that adjusts the tilt of the device,
A tilt foot part composed of a shaft and a foot part provided with male threads;
A cylindrical holding block which is provided so as to surround the shaft, has an internal thread that can be screwed with the external thread on the inner surface, and is divided into two in a direction parallel to the axis of the shaft;
Moving means for moving each of the two divided holding blocks to a position where the male screw and the female screw are engaged and a position where the engagement of the male screw and the female screw is disengaged;
An operation button provided on the surface of the device for operating the moving means;
The outer surface of each of the holding blocks is a curved surface having a taper portion spreading toward the bottom at the lower end,
The moving means has a member having a cylindrical surface that surrounds the holding block, and has a divergent taper portion that is aligned with the tapered portion of the holding block in the vicinity of the lower end portion of the inner surface of the cylindrical surface. The inner diameter of the surface is such that when the outer surface excluding the tapered portion of the holding block comes into contact, the screwing of the female screw of the holding block and the male screw of the shaft is released, and the extended end of the tapered portion of the holding block is When the female block of the holding block comes into contact with the male screw of the shaft when contacted,
The operation by the operation button is a tilt foot structure in which the taper portion of the holding block is moved between a position in contact with the cylindrical surface and a position in contact with the tapered portion of the cylindrical surface. The holding block is a cylindrically divided structure that surrounds the shaft, and one end side of the cylinder is sized to contact the periphery of the through hole of the tilt foot portion of the device, The inner surface is provided with a female screw that can be screwed with the male screw of the shaft, and the outer surface of the cylinder is provided with a downwardly opening tapered portion corresponding to the female screw, and the ends opposite to the female screw are fixed to each other. It is supported by a pin so that it can be opened and closed, and is urged to the open side by compression means, and a support arm that extends sideways is provided on each upper part.
The moving means surrounds a through hole of the tilt foot portion of the device and is fixed to the device so as to surround the holding block, and is provided outside the cylindrical structure. A compression spring that presses each support arm of the holding block in a direction away from the through hole;
A portion of the inner surface of the cylindrical structure corresponding to the tapered portion of the holding block has the taper on the outside of the holding block in a state in which the female screw of the holding block and the male screw of the shaft are released. 2. The tilt foot structure according to claim 1, wherein a tapered portion that abuts the first portion is provided, and a notch into which the support arm of the holding block can be inserted is provided at an upper portion.   The operation button pushes down the support arm of the holding block against the pressing force of the compression spring, so that the tapered portion of the holding block is aligned with the tapered portion of the inner surface of the cylindrical structure. The tilt foot structure according to claim 1, wherein the holding block is configured to be pushed down to the bottom.   The portion of the inner surface of the holding block where the female screw is not provided is a curved surface that is close to the apex of the thread of the male screw in a state where the female screw is screwed with the male screw of the shaft. 3. A tilt foot structure according to 2.   The tilt foot structure according to claim 2, wherein the compression means is a coil spring.   The tilt foot structure according to claim 2, wherein the compression means is one of an elastic synthetic resin and a rubber member.   The tilt foot structure according to claim 2 or 3, wherein the compression spring is a single coil spring that surrounds the outer periphery of the cylindrical structure. 4. The tilt foot structure according to claim 2, wherein each of the compression springs is two coil springs each biasing the pointing arm across an outer periphery of the cylindrical structure. 5.

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