JP4249934B2 - Manual telescopic column - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manually extendable column that is installed so as to be able to move up and down, such as a projector, an antenna, or a television camera, and is held at an arbitrary height.
[0002]
[Prior art]
Various proposals have been made for mechanisms for raising and lowering a load such as a projector, and a mechanism provided with a drive motor that provides lifting power in order to reduce the weight burden of the load and facilitate the lifting operation. is there.
[0003]
[Problems to be solved by the invention]
However, when a drive motor is provided, the drive mechanism becomes complicated, and there is a limit to reducing the weight and size of the apparatus. Further, depending on the type of the load, it is necessary to provide a mechanism for rotating around the axis, which makes it more difficult to reduce the weight and size.
The present invention has been made in view of such circumstances, and an object thereof is to provide a manually extendable column that can be reduced in size and weight.
[0004]
[Means for Solving the Problems]
The manual telescopic column according to the present invention is designed to reduce the burden on the weight of the load when moving up and down while realizing a lighter and smaller size by using a constant load spring instead of the drive source for lifting and lowering. An object can be rotated around an axis.
That is, the present invention is provided with a main body portion, a lower portion accommodated in the main body portion, and a shaft having an upper portion extending upward from the main body portion and capable of fixing a load so as to be movable in the axial direction of the main body portion ,
At the lower part of the shaft, an end for attaching the lower end of the constant load spring and a spring fixing bracket having a through hole having a smaller diameter than the shaft are arranged, and a screw having a screw part having a smaller diameter than the through hole is passed through the through hole. The bracket is attached to the lower end of the shaft by providing a clearance X between the shaft and the bracket and between the bracket and the screw head, and between the upper portion of the main body and the end of the spring fixing bracket. to the constant force spring for imparting a biasing force to hold the axial position of the shaft through the fitting is provided, whereby it was held rotatably the shaft to movably and axially around the axial direction It is a manual telescopic column for mounted objects such as a projector.
If necessary, a means for fixing the rotation of the shaft and a means for fixing the axial movement of the shaft may be provided.
It is preferable that the leaf spring of the constant load spring is disposed so as to be inclined with respect to the shaft axis.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a manual telescopic column according to the present invention will be described based on the drawings.
As shown in FIG. 1, the manual telescopic column 1 is provided with a holding member 3 at the upper end of a prismatic main body 2 and holds a stainless steel shaft 4 via the holding member 3. A gantry 6 on which a pair of projectors 5 are placed is provided at the upper end of the shaft 4. The main body portion 2 has a flange portion 2a at an upper position of the intermediate portion, and an angle portion 2b at a lower end portion. Mounting holes are formed in the flange portion 2a and the angle portion 2b, and when installing the manual telescopic column 1, bolts (not shown) are inserted and fixed in the mounting holes of the flange portion 2a and the angle portion 2b. To stand in place. In addition, the main-body part 2 has the drain pipe 2c in a lower end part.
As shown in FIGS. 1 and 2, the shaft 4 can be moved in the axial direction so as to be expanded and contracted with respect to the main body 2. The expansion / contraction stroke of the shaft 4 in this embodiment is about 900 mm, for example.
[0006]
As shown in FIG. 4, the holding member 3 is provided with oilless metals 3 a and 3 a at two upper and lower portions. As a result, the shaft 4 can be satisfactorily slipped, and the shaft 4 is held by the holding member 3 so that it can be moved in the axial direction and rotated about the axis. A lock screw 7 is provided on the holding member 3, and the movement of the shaft 4 can be fixed by the lock screw 7.
The upper part of the shaft 4 protrudes from the main body 2, and the lower part of the shaft 4 is accommodated in the main body 2. A spring fixture 8 is attached to the lower portion of the shaft 4. As shown in FIG. 5, the spring fixing bracket 8 includes end portions 8 b and 8 b for attaching a lower end 10 c of a leaf spring 10 a to be described later and a through hole 8 c having a smaller diameter than the shaft 4. The attachment is performed by screwing a female screw 4a at the lower end of the shaft 4 and screwing a screw 9 having a male screw 9a corresponding to the female screw 4a into the female screw 4a through the through hole 8c of the spring fixing bracket 8. ing. In the attached state, a predetermined gap X is formed between the shaft 4 and the spring fixing bracket 8. Accordingly, the shaft 4 is supported so as to be rotatable about the axis with respect to the spring fixing bracket 8 , and the angle of the shaft 4 can be freely changed within a substantially horizontal plane within the main body 2 fixed at the installation place.
[0007]
As shown in FIG. 4, two constant load springs 10 and 10 are provided inside the main body 2 so as to face each other. The constant load spring 10 is an elongated, strip-shaped plate spring 10a wound around a drum portion 10b in a coil shape. When the outer end 10c of the plate spring 10a is extended from the drum portion 10b, the plate spring 10a is moved to the drum portion. An urging force is generated in the direction of rewinding to 10b. In the present embodiment, the projector 5 is easily lifted using the rewinding force when the constant load spring 10 is stretched, and the projector 5 is maintained at the raised height.
The drum portion 10b is screwed to the inner wall surface 2d of the main body portion 2, and the leaf spring lower end 10c is attached to the end portion 8b of the spring fixing bracket 8 via the fixing plate 8a. Since the main body 2 and the spring fixing bracket 8 are connected by the constant load spring 10, the urging force of the constant load spring 10 acts on the shaft 4 via the spring fixing bracket 8. The weight of the projector 5 and the biasing force of the constant load spring 10 are balanced, and in particular, the projector 5 can be held at an arbitrary height without providing a position fixing means. Can be done with force. If the projector 5 is pushed down, its height can be lowered.
As shown in FIGS. 3 and 5 , the leaf spring 10a of the constant load spring 10 attached to the spring fixing bracket 8 is bent and bent at the outer end 10c. The reason for this is as follows. That is, when the leaf spring 10a is extended, both ends in the lateral direction are turned up by the force of the spring itself, and the cross-sectional shape becomes concave. This phenomenon becomes more prominent as the length of the extending spring becomes longer, and the turned-up portion comes into contact with the shaft and the outer cover, causing a hindrance to the extending operation. Therefore, by bending the outer end 10c and pulling it obliquely, the extending cross-sectional shape of the leaf spring 10a becomes a flat surface, and there is no such inconvenience.
[0008]
When the weight of the projector 5 is large, the weight balance can be achieved by using a constant load spring having a larger spring constant, and the weight balance can be achieved by increasing the number of constant load springs 10. By maintaining the weight balance, an arbitrary height can be maintained without being affected by the weight of the projector 5, and the height can be moved with a slight force. For example, a total of four constant load springs 10 can be used, and more constant load springs can be used.
[0009]
When the shaft 4 is rotated about the axis with respect to the spring fixing bracket 8, since the clearance X is provided between the spring fixing bracket 8 and the screw 9, the shaft 4, the gantry 6, and the projector 5 include the main body 2. However, the angle can be freely changed in a substantially horizontal plane. The angle can be fixed with a lock screw 7 provided on the holding member 3. The lock screw 7 can also be used when fixing the height of the projector 5.
[0010]
As shown in FIG. 4, a latch lock 11 is attached to the gantry 6, and a groove portion 3 b is formed in the holding member 3 correspondingly. Therefore, the gantry 6 and the projector 5 can be pushed down to the lowest position (see FIG. 2), and the gantry 6 and the holding member 3 can be connected and fixed by the latch lock 11.
[0011]
【The invention's effect】
Since the present invention uses a constant load spring to raise and lower a projector or other load with a slight force and maintain an arbitrary height, the structure can be simple and lightweight, and the installation area can also be increased. Just a little. Further, the shaft can be rotated around the axis with respect to the spring fixing bracket, and the angle of the shaft can be freely changed in a substantially horizontal plane.
[Brief description of the drawings]
FIG. 1 is a front view showing a state where a projector is fixed to a manually extendable column according to an embodiment of the present invention and a shaft is extended.
FIG. 2 is a right side view showing a state in which a shaft of a manual telescopic column to which a projector is fixed is pushed down.
FIG. 3 is an enlarged view of a portion III in FIG.
4 is a schematic vertical cross-sectional view of the manually extendable column in FIG. 1. FIG.
FIG. 5 is an enlarged view of a portion V in FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Manual expansion-contraction column 2 Main-body part 2a Flange part 2b Angle part 2c Drain pipe 2d Inner wall surface 3 Holding member 3a Oilless metal 3b Groove part 4 Shaft 4a Female screw 5 Floodlight 6 Mounting stand 7 Lock screw 8 Spring fixing bracket 8a Fixing plate 8b End part 8c Through-hole 9 Screw 9a Male screw 10 Constant load spring 10a Leaf spring 10b Drum part 10c Outer end 11 Latch lock X Clearance

Claims (4)

Main body 2;
A shaft 4 having a lower part accommodated in the main body part 2 and an upper part extending upward from the main body part 2 and capable of fixing a load is provided to be movable in the axial direction of the main body part 2 ;
The bottom of the shaft 4, to place the spring fixing member 8 having an end portion 8 b and the through hole 8 c of smaller diameter than the shaft 4 for mounting the lower end 10 c of the constant force spring 10, the small diameter of the screw than the through-hole 8c A screw 9 having a portion is attached to the shaft 4 through the through hole 8c, and the metal fitting 8 is provided with a clearance X between the shaft 4 and the metal fitting 8 and between the metal fitting 8 and the head of the screw 9 to provide the shaft 4 Attached to the lower end of
Between the end 8b of the upper and the spring fixing member 8 main body 2 is provided with a constant force spring 10 to impart a biasing force to hold the axial position on the shaft 4 via the bracket 8,
Thus, a manually extendable column for a mounted object such as a projector, wherein the shaft 4 is held so as to be movable in the axial direction and rotatable about the axis. Manual expandable column according to claim 1, further comprising a means for fixing the rotation of the shaft 4. Manual expandable column according to claim 1 or 2, characterized in that it comprises a means for fixing the axial movement of the shaft 4. The manually extendable column according to claim 1, wherein the leaf spring (10b) of the constant load spring (10) is disposed to be inclined with respect to the axis of the shaft (4).

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