JP3692010B2 - Elevating chair locking device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chair that lifts and lowers a seat with a cylinder and locks the rotation of the ram of the cylinder with a brake shoe after the lifting and lowering of the seat and stops the lifting of the seat. It is related with the locking device of the raising / lowering chair which enabled the lock | rock of the ram to be automatically performed if the lock | rock of this was cancelled | released and raising / lowering was completed.
[0002]
[Prior art]
Conventionally, in a chair that is lifted and lowered by a cylinder, the seat portion can be rotated to the left and right by rotating the ram itself that performs the lifting and lowering operation. The rotation of the ram must be locked with a shoe.
[0003]
Therefore, when raising and lowering the seat, after the operation of releasing the lock of the ram by the brake shoe, the seat is raised and lowered by operating the ram raising and lowering means. An operation to lock the ram was performed.
[0004]
[Problems to be solved by the invention]
In the lifting chair of such a mechanism, when the ram is lifted and lowered with the raising and lowering of the seat portion, the brake shoe is loosened because the ram is tightened by the brake shoe and cannot be lifted, for example, the pedal is pressed. And so on.
[0005]
When the lift is finished, the pressed pedal is lifted, the ram is tightened with a brake shoe to prevent rotation, and the seat portion is prevented from rotating during the cutting operation.
[0006]
Thus, in the conventional lift chair, it is necessary to push up the pedal pushed down to unlock the ram in order to lock it, and the upper surface of the shoe will be used for that purpose. There was a problem such as.
[0007]
The present invention is intended to solve the above-described problems. The object of the present invention is to provide a switch for raising and lowering the ram without pushing up the pedal for locking and locking the ram by a brake shoe. It is possible to release the lock of the ram without operating the switch for raising and lowering the ram, and it is possible to unlock only the ram. is there.
[0008]
The locking device for the lifting chair according to the present invention achieves the above-described object, and means includes an operating shaft whose tip is supported so as to be able to move up and down and rotate in both the left and right directions, and the operating shaft above the operating shaft. For lifting the ram, rotating pedal for rotating the operating shaft in both the left and right directions orthogonal to the operating shaft, and driving the cylinder for moving the seat up and down, and rotating the operating shaft in both the left and right directions respectively for lifting the ram and right and left one switch, connects the brake shoe male screw is screwed into the screw portion with attached so as to surround the ram periphery of the cylinder, and the screw of the brake shoe and the operating shaft wherein rotating the screw and a coupling means for releasing the clamping of the ram by the brake shoe, except when pressing of the rotary pedal of the spring bar when the rear end of the operation shaft is pressed Te It is obtained to automatically tighten the ram pushes the operating shaft upward by the force.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a locking device for a lifting chair according to the present invention will be described with reference to the drawings.
[0011]
Reference numeral 1 denotes a chair base , and a vertically rotating body 2 is rotatably supported by a shaft 1b on a shaft support 1a fixed on the upper surface.
[0012]
A rotating support shaft 2a that protrudes forward is fixed to the vertical rotating body 2 at the center of the left and right of the place that is supported by the shaft support 1a. However, a fixed operation shaft 3 is fitted in the axial direction. The operating shaft 3 is formed with a lowering switch 9a for raising and lowering a ram 6a of a hydraulic cylinder 6 described later, and T-shaped arms 3a and 3b for operating the raising switch 9b .
[0013]
The operation shaft 4 is inserted into the operation shaft body 3 so as to be exposed behind the chair base 1, and a rotary pedal 4 a is fixed to the rear end of the operation shaft 4 so as to protrude in both the left and right directions. A spring 5 is installed between the operation shaft body 3 and the chair base 1 to push up the rear end of the operation shaft 4 upward.
[0014]
In addition, the hydraulic cylinder 6 is fixed to the chair base 1 in an upright state, and a seat base 7 is attached to the upper end of the ram 6 a of the cylinder 6. The ram 6 a is lowered if the user presses the down switch 9a by the hydraulic circuit 8 attached to the cylinder 6, also is configured to rise when the user presses the up switch 9b.
[0015]
Near the upper end of the ram 6a, a brake shoe 10 having an inner diameter substantially equal to the diameter of the ram 6a is attached so as to surround the ram 6a. The brake shoe 10 has a through hole 10a. A screw 11 having a male screw 11a at the tip is inserted into the through hole 10a. The male screw 11a of the screw 11 is screwed into the nut 12 of the brake shoe 10, and the screw 11 is rotated. The inner diameter of the brake shoe 10 is expanded or reduced.
[0016]
One end of an arm 13 is fixed to the screw 11, and the other end of the arm 13 is rotatably supported on the upper end of a connecting rod 14. The lower end of the connecting rod 14 is connected to an arm 3 c that extends rearward from the operation shaft body 3.
[0017]
Lock equipment for lifting the chair of this embodiment, in a state where the rotation pedal 4a is not pressed not operated as shown in FIG. 1, the operation shaft for the operation shaft 3 is pushed up by the spring 5 3 is pushed up by the arm 3c, and this movement is transmitted to the screw 11 by the arm 13 so that the screw 11 rotates, so that the nut 12 is tightened and the brake shoe 10 fastens the ram 6a, and the rotation of the ram 6a. Is blocking.
[0018]
Then, in order to raise the chair, when the right side of the rotary pedal 4a is pushed down with the foot in FIG. 3, the operation shaft 4 and the operation shaft body 3 rotate clockwise about the rotation support shaft 2a, and this movement is operated. The connecting rod 14 is pushed up by the arm 3c of the shaft body 3, and the arm 13 rotates the screw 11 counterclockwise in FIG.
[0019]
The rotation of the screw 11 releases the tightening of the ram 6a by the brake shoe 10 and releases the ram 6a from being raised and lowered and prevented from rotating. Further, since the lift switch 9b is pushed by the rotation of the rotation support shaft 2a, the hydraulic circuit 8 operates to supply oil into the cylinder 6 and thus raise the ram 6a. When the lift reaches a predetermined position and the foot is released from the rotating pedal 4a, the operating shaft 4 is pushed up by the spring force of the spring 5, and accordingly, the pedal 4a returns to the neutral position and the ram 6a rotates. As the movement is blocked, the ascent switch 9b is cut off and the ascent of the ram 6a is stopped.
[0020]
Further, when the left side of the rotary pedal 4a is stepped on, the ram 6a is unlocked by lowering the rear end side of the operation shaft 4 as described above, and at the same time, the operation shaft 4 operates in the opposite direction. The lowering switch 9a is closed and the ram 6a is lowered. When the foot is released from the pedal 4a, the pedal 4a returns to the neutral position as described above, and the ram 6a is locked.
[0021]
In this way, the brake shoe 10 releases the lock of the ram 6a by stepping on the right side or the left side of one rotary pedal 4a, the seat portion is free to rotate, and the ram 6a is raised. Alternatively, if the foot is lowered and the foot is lifted to an arbitrary height and the foot is released from the rotating pedal 6a, the ram 6a stops moving up and down and the ram 6a is locked by the brake shoe 10.
[0022]
Further, when the center of the rotary pedal 4a, that is, the joint with the operation shaft 4 is pushed down, the operation shaft 4 does not rotate, so that the arm portions 3a and 3b press the up switch 9a and the down switch 9b. There is no, and only the lock of the ram 6a due to the downward inclination of the front end side of the operation shaft 4 is released.
[0023]
Therefore, when it becomes necessary to change the orientation of the seat part during the cutting operation, the ram 6a is unlocked by stepping on the center of the rotating pedal 4a as described above, and the seat part can be freely oriented. It is possible to change the position of the ram 6a by releasing the foot from the rotary pedal 4a, and the possibility of changing the orientation of the seat portion can be eliminated.
[0024]
【The invention's effect】
As described above, according to the present invention, the rotation of the ram is automatically performed without the operation for locking the rotation of the ram before the rotation pedal is depressed and after the ram is lifted and lowered by the depression of the rotation pedal. The direction of the customer who is locked and sits on the seat does not change.
[0025]
Then, when the seat is raised and lowered by raising and lowering the ram by stepping on the rotation pedal, the raising and lowering and rotation of the ram are automatically locked without performing an operation for unlocking the raising and lowering of the ram. Once released, the ram can be raised and lowered.
[0026]
Therefore, there is no need to specially operate the ram rotation lock device when raising and lowering the seat, the operation is simplified and operation mistakes are naturally prevented, and it is easy to operate and malfunctions due to operation mistakes etc. It can be prevented beforehand.
[0027]
In addition, when the center part of the rotating pedal, that is, the connecting part with the operating shaft is stepped on, only the rotation lock of the ram can be removed. It has the effect that can be removed.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of the present invention by cutting a part thereof in a state before a pedal is depressed.
FIG. 2 is a side view showing a part of the above in a state where a pedal is depressed and partly cut.
FIG. 3 is a plan view of FIG. 1 with a part cut away.
[Explanation of symbols]
3 Operation shaft body 3a, 3b Arm portion 3c Arm 4 Operation shaft 4a Rotating pedal 6 Cylinder 6a Ram 9a Lowering switch 9b Lifting switch 10 Brake shoe 11 Screw 14 Connecting rod

Claims (1)

An operation shaft supported so that the tip portion can move up and down and rotate in both the left and right directions; a spring that pushes the operation shaft upward; a rotary pedal that rotates the operation shaft in both the left and right directions orthogonal to the operation axis; and right and left one switch for ram lift operating each in rotation in both directions of the operating shaft by driving the cylinder for raising and lowering the seat, the threaded portion with attached so as to surround the periphery of the ram of the cylinder the male thread brake is screwed shoe, tightening of the ram by rotating the brake shoe to the screw and the screw and the operating shaft when the rear end of the operating shaft coupled is pressed in the brake shoe Connecting means for releasing the ram, and the ram is automatically tightened by pushing up the operation shaft upward by the spring force of the spring except when the rotary pedal is pressed down. Locking device of the lift chair, characterized.

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