JP2623194B2 - Elevating screw cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw cylinder for raising and lowering and turning a chair seat or a pedestal such as a screw-driven electric / cosmetic chair, a medical table and an optical table.

[0002]

2. Description of the Related Art A conventional screw-driven lifting device is disclosed in Japanese Patent Publication No. 56-4340, which was previously filed by the applicant and published.
There is No. 7 "Mounting device". According to this, the shaft 11 of the male screw 16 that is rotationally driven is located at the bottom of the inner surface of the case 1 but is provided outside the male screw 16 so that the screw 19
And the male screw 16 is rotated, so that the elevating cylinder 1
7 is provided to rise. However, since the fixing member 13 provided in the case 1 is provided above the motor 2, the elevating cylinder 17 cannot be positioned below the motor 2, and therefore the initial height (a chair, a medical table Sufficient stroke cannot be taken for the same position after the lowest position). That is, there is a disadvantage that the dead stroke portion of "initial height"-"stroke" = "dead stroke" is long.

In the screw drive, since the elevating cylinder 17 rotates at the time of elevating, the rotation is reduced to some extent by a load placed on a chair or a table as in the prior application, and the elevating cylinder 17 is stopped from rotating. I was This does not provide sufficient rotation control, and there is a disadvantage that the chair seat or the pedestal moves on its own during work or treatment.

Further, according to this, when the elevating cylinder 17 is moved up to the maximum, the operating leaf 37 is released, the upper limit switch 33 is operated, and the elevating cylinder 17 stops being lifted. In this case, when an electric failure of the limit switch or the like occurs and the switch does not operate, there is a problem that the elevating cylinder 17 comes off.

[0005]

As described above, in the conventional screw cylinder for raising and lowering, since the raising and lowering cylinder 17 cannot be positioned below the motor 2, a sufficient stroke cannot be taken with respect to the initial height. Because of the problem of
By moving the elevating cylinder 17 to a position below the motor 2, the dead stroke portion is shortened so that a sufficient stroke can be obtained with respect to the initial height.

Further, in order to eliminate the drawback of rotating at the time of working or performing operations on a chair seat or a pedestal at the time of ascending or stopping, a structure is provided in which the elevating cylinder 17 can be easily locked or released so as not to rotate, and sufficient rotation control is performed. To be able to do. Furthermore, in order to take measures such as when the control of the highest position cannot be performed due to an electrical failure of a limit switch or the like, even if the motor continues to rotate on the rising side, the rising stops mechanically at the highest position. It is structured so that the lifting cylinder 17 does not come off.

[0008]

In order to attain the above object, a lifting screw cylinder according to the present invention is provided with a hollow shaft attached to a motor, which is provided to extend below the motor in an inner cylinder base and is moved up and down. So that the elevating screw part can be made longer. An elevating screw shaft is fixed inside the hollow shaft, and an elevating cylinder is screwed to the elevating screw shaft so as to be able to ascend and descend by an elevating cylinder female thread provided below the elevating cylinder.

A key is attached to the inner cylinder, and the key is inserted into a groove cut in the inner surface of the elevating outer cylinder, thereby guiding the elevating outer cylinder to ascend and descend so as not to rotate easily. A rotating flange to which a chair seat or a pedestal is attached is provided on the substrate located at the top of the elevating cylinder so as to be rotatable with respect to the elevating cylinder, and one end of the substrate above the elevating cylinder is pivotally supported. A roller is provided at an intermediate portion of a lever to which a spring for urging the other side inward is attached, and the rotation of the chair seat or the pedestal is performed by fitting into a plurality of grooves provided in the rotating flange support plate. The rotation flange is configured to be easily stopped, and the rotation of the rotary flange of the chair seat or the pedestal can be stopped or positioned.

Further, the screw portion at the top of the elevating screw shaft is shaved to be smaller than the screw bottom diameter of the elevating screw shaft to form a screw shaft idler portion. In order not to let it go, idle it at the idler part of the lifting screw.

[0011]

Since the lifting screw cylinder of the present invention has the above-described structure, a hollow shaft attached to the motor and rotatable integrally with the rotor is provided extending to a position below the motor in the base case. An elevating screw is fixed below the hollow shaft, and the elevating screw is rotated by driving a motor. When the elevating screw rotates, the elevating cylinder female screw portion provided inside the lower part of the elevating cylinder to which the chair seat or the pedestal is attached is screwed with the male screw of the elevating screw, so that the elevating cylinder moves up and down. It has become.

[0012] Therefore, since the vertical female screw portion can be positioned below the motor, the vertical cylinder provided with the chair seat or the pedestal can be moved from a low position to a high position. A rotating flange to which a chair seat or a pedestal is attached is provided on the substrate located on the top of the elevating outer cylinder so as to be rotatable with respect to the elevating outer cylinder, and is provided on the substrate above the elevating outer cylinder, and one end is a shaft. A roller is provided at an intermediate portion of a lever to which a spring which is supported and the other of which is provided to urge inward is attached. Thereby, the chair seat or the pedestal is configured to be stopped by the roller being fitted into the roller groove provided on the rotating flange support plate, and the rotation of the rotating flange to which the chair seat or the pedestal is attached is stopped. , The positioning can be easily performed.

Further, since the male screw portion at the top of the elevating screw is shaved smaller than the diameter of the elevating screw shaft to form a screw idler, when the female screw portion of the elevating cylinder rises to the position, the elevating cylinder does not rise. Thus, even when the limit switch or the like does not operate due to an electrical failure, it does not come off, and can be stopped at the highest position.

[0014]

FIG. 1 is a longitudinal sectional view showing a state in which a lifting screw cylinder is lowered, and FIG. 2 is a longitudinal section showing a state in which the lifting screw cylinder is raised. FIG. 3 is a plan view of a rotation stopping mechanism, FIG. 4 is a cross-sectional view of a main part of a top of a lifting screw, and FIG. 5 is a side view of a state in which a chair seat is mounted on a screw cylinder for lifting. Now, the lifting screw cylinder mounted on a chair will be described in particular.

Referring to FIG. 5, reference numeral 1 denotes a base in which a screw cylinder for raising and lowering is used in a chair, and an inner cylinder 2 of the screw cylinder is fixed to the base 1 in a detachable manner. Reference numeral 13 denotes an elevating outer cylinder, which is provided so as to be able to move up and down with respect to the inner cylinder 2, and has a structure in which a chair seat 26 is mounted on an upper portion.

Next, the lifting screw cylinder according to the present invention will be described. Reference numeral 3 denotes an inner cylinder base which is fixed to a lower portion of the inner cylinder 2. A motor 5 is fixedly supported at an intermediate position of the inner cylinder 2, and a hollow shaft 6 is rotatably supported by the motor 5 via a bearing 8. A bracket 7 is fixed to the bottom of the hollow shaft 6, and an elevating screw 9 is fixed at the axial position of the hollow shaft 6 together with the hollow shaft 6 by the bracket 7 and stands upright. A screw shaft idler portion 9a is formed on the top of the lifting screw 9 by shaving it smaller than the shaft diameter of the lifting screw 9.

Further, a lifting member 10 having a female screw portion 10a at a lower portion is screwed to the lifting screw 9 so that the lifting screw 9 can be raised and lowered with the rotation of the lifting screw 9. A rotating flange 11 to which a chair seat is attached is fixed above the elevating cylinder 10. Supporting plate 11a in the lower portion of the rotary flange 11, the base portion 11b is integrally formed respectively, a sliding otherwise 11c is formed on the bottom surface of said supporting plate 11 a, a plurality on an outer peripheral surface of the supporting plate 11a Roller groove 11
d is provided. And an ultraviolet ray tube housed in the housing.

Reference numeral 12 denotes a substrate. The outer peripheral surface of the substrate 12 is fixed to the elevating outer cylinder 13 via a detent pin 21, and a sliding groove 12a is formed on the upper surface.
The sliding protrusion 11c is inserted so as to be rotatable and slidable with respect to the substrate 12. Further, on the upper surface of the substrate 12, a lever 23 rotatably supported on one side by a base shaft 24 is provided, and a spring 25 biased toward the support plate side is provided on the other side.
2 are installed. The rotation of the rotating flange 11 is stopped by fitting the roller 22 into a roller groove 11 d provided on the outer peripheral surface of the support plate 11 a of the rotating flange 11.

Further, a key groove 13a is cut at an appropriate position on the inner surface of the elevating outer cylinder 13, and a key 17 fixed to the inner cylinder 2 is fitted to prevent a guide when the chair moves up and down and prevents easy rotation. I have. Therefore, the key 1 fixed to the inner cylinder 2
7 is slidable in a key groove 12a provided on the inner surface of the elevating outer cylinder 13, so that the elevating outer cylinder 13 does not rotate and moves up and down by the lead of the elevating screw 10.

Reference numeral 18 denotes a lower limit position detection switch, which is operated by pressing or light amount when the substrate 12 integrated with the elevating outer cylinder 13 is located at the lowest position, and the chair seat 2 at the lowest position.
6 will stop. Reference numeral 19 denotes an upper limit position detection switch. The lowermost portion of the elevating cylinder 10 is operated by contact with the upper limit position detection switch 19 or by the amount of light, and the chair seat 26 stops at the uppermost position. Reference numeral 4 denotes a fixed bracket that guides the elevating cylinder 10 and also functions as a mounting base for the switches.

With the above structure, the lifting screw 9 fixed in the hollow shaft 10 having a hollow shaft driven by the motor is simultaneously rotated, and the lifting screw 9
Is screwed into the female screw portion 10a of the elevating cylinder 10 to prevent rotation by the key groove 13a of the elevating outer cylinder 13 and the key 17 attached to the inner cylinder 2 and to fix the fixing bracket 4 And the sliding outer cylinder 13 with the sliding pads 27 and 28,
The board 12 provided near the top of the elevating cylinder 13 and the rotating flange 11 to which the chair seat 26 is attached, etc., are integrally guided up and down while being guided.

A lower portion of the inner cylinder 2 is provided with an inner cylinder base 3 which can be inserted into a socket of the chair base 1, and a hollow shaft 6 of the motor 5 is inserted into a concave portion of the inner surface of the inner cylinder base 3 at a lower portion of the motor 5. Since it is provided in a projecting manner, the length of the screw portion of the lifting screw 9 can be increased. Further, the rotating flange 11 is rotatable with respect to the substrate 12 fixed to the elevating outer cylinder 13, and the roller 22 provided on the upper surface of the substrate 12 is provided on the outer peripheral surface of the support plate 11 a of the rotating flange 11. The rotation of the rotating flange 11 can be stopped by fitting into the roller groove 11d.

Further, since the male screw portion at the top of the elevating screw 9 is shaved smaller than the diameter of the shaft of the elevating screw 9 to form the screw shaft idler portion 9a, the female screw portion 10 of the elevating cylinder 10 is formed.
When a rises to this position, the elevating cylinder 10 does not rise, so even if the elevating cylinder 10 rises to the upper limit position, such as when the upper-limit position detection switch 19 does not operate due to an electrical failure, it comes out. Without stopping at the highest position.

In the above embodiment, the shape of the rotating flange 11 rotatably supported by the substrate 12 fixed to the elevating outer cylinder 13 and fixing the chair seat 26 is not particularly limited, and may be appropriately adjusted. Any structure can be used as long as the rotation is stopped and released at the position. In the above embodiment, the lifting screw cylinder of the present invention is disclosed as being insertable into the base 1. However, it may be formed integrally. Further, the positions of the upper and lower position detection switches 18 and 19 can be changed as appropriate, and the installation positions of the key groove 13a and the key 17 for performing the rotational braking can be changed as appropriate.

[0025]

As described above, according to the present invention, the hollow shaft, which is the rotating shaft of the motor, is projected from below the rotor, the lower end of the lifting screw is attached to this hollow shaft, and the lifting cylinder is screwed onto the lifting screw. The vertical movement width of the elevating cylinder can be increased because it is moved up and down together, so that the initial height of a chair seat such as a hairdressing chair can be lowered and the elevating stroke can be lengthened.

Further, since the chair seat is rotatable and lockable with respect to the elevating cylinder, the chair seat can be rotated to an appropriate position or its rotation can be stopped. The chair seat can be fixed to further,
At the upper limit position of the elevating cylinder, the upper end of the elevating screw is a screw shaft andrundler part, so even if it rises to the highest position of the elevating cylinder, it does not come off from the elevating screw, so a sensor that detects the highest position In the case of a failure, there is an effect that the chair seat does not come off and is safe.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a state in which a lifting screw cylinder to which an embodiment of the present invention is applied is lowered.

FIG. 2 is a longitudinal sectional view showing a state in which a lifting screw cylinder is raised.

FIG. 3 is a plan view of a rotation stopping mechanism.

FIG. 4 is a sectional view of a main part of a top portion of a lifting screw.

FIG. 5 is a side view of a state in which a chair seat is mounted on the lifting screw cylinder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 2 Inner cylinder 3 Inner cylinder base 4 Fixed bracket 5 Motor 6 Hollow shaft 7 Bracket 8 Bearing 9 Lifting screw 9a Idler part 10 Lifting cylinder 10a Female thread part 11 Rotating flange 11a Support plate 11b Base part 11c Sliding protrusion 11d Roller groove DESCRIPTION OF SYMBOLS 12 Substrate 12a Sliding groove 13 Elevating outer cylinder 13a Keyway 14 Snap ring 15 Cover 17 Key 18 Lower limit position detection switch 19 Upper limit position detection switch 21 Detent pin 22 Roller 23 Lever 24 Base shaft 25 Spring 26 Chair seat 27 Sliding pad 28 Sliding pad

Claims (2)

(57) [Claims] 1. A base, an inner cylinder fixedly inserted into a center of the base in an upright state, a motor fixed to a substantially center of the inner cylinder, and a role as a rotation shaft of the motor. A hollow shaft to be formed, an elevating screw having a lower end fixed to the hollow shaft and protruding from an upper end of the hollow shaft, an elevating cylinder screwed to the elevating screw and moving up and down in the hollow shaft, A substrate fixed to the upper end of the elevating cylinder, an elevating outer cylinder fixed to the outer periphery of the substrate and restricted in the rotating direction with respect to the inner cylinder and raised and lowered, and rotatably supported by the substrate A rotating flange having roller grooves formed at desired intervals on an outer periphery of a disk-shaped support plate, and a roller rotatably supported outside the support plate of the substrate and rotatably fitted in the roller groove at an intermediate portion. And a roller attached to the tip of the lever, A lifting / lowering screw cylinder comprising a spring which is pressed against the outer peripheral side of the support plate. 2. The lift screw according to claim 1, wherein a screw portion at an upper end of the lift screw is cut off to form a screw shaft idler portion, and the screw shaft idler portion prevents the lift cylinder from coming out of the lift screw. Screw cylinder for lifting.