JPH0325640Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a pedal for lifting and lowering a chair.

[Conventional technology]

2. Description of the Related Art In hairdressing chairs and the like, it is known that the seat is electrically raised and lowered by operating a single pedal (for example, Japanese Patent Publication No. 43407/1983).

The above-mentioned lifting device is equipped with a locking device for the lifting shaft, and the locking device is operated by a pedal via a link mechanism. Therefore,
The pedal rod is connected to the link mechanism, but since it is necessary to operate the up and down switches of the lifting device at the same time, the pedal rod is attached to the end of the link mechanism so as to be rotatable around an axis.

[Problem that the invention attempts to solve]

As mentioned above, in conventional lifting devices, a single pedal was used to operate the locking device and the lift/lower switches at the same time, so the pedal could only swing in the vertical direction. It was necessary to install it so that it could rotate around its axis. Although it is reasonable to use the pedal as the operating lever for operating the locking device,
Attaching the pedal so that it rotates around an axis complicates the mechanism and poses a problem of causing failure.

Further, since the up and down switches are attached to the main body of the device, it is necessary to remove the cover of the device when inspecting or repairing the switch, making maintenance difficult.

Therefore, the object of this invention is to provide a pedal that solves these problems.

[Means for solving problems]

In order to solve the above-mentioned problems, this invention is a chair lifting/lowering operation pedal with treads protruding from both sides of the tip of the pedal rod.Limit switches for raising and lowering are provided on the top surface of each treadle, and a movable limit switch is installed on the top surface of each limit switch. In addition to providing a flexible contact operating plate, an elastic body is interposed between the contact operating plate and the treadle, and the elastic body separates the contact operating plate from the limit switch by a certain distance, and the pedal depression force increases beyond a certain level. The elastic body is configured to have a predetermined elasticity so that it is compressed when the elastic body is compressed.

[Effect]

When a pedal force is applied to either one of the contact operating plates, the pedal rod is lowered and the locking device is actuated in the releasing direction via a link mechanism connected to the pedal rod. Furthermore, when the pedal force reaches a certain level, the contact operating plate compresses the elastic body and descends, activating the contact of the limit switch. This drives the motor to raise or lower the elevating shaft.

〔Example〕

FIG. 1 shows a lifting device equipped with pedals according to this invention. This elevating device has a main body 2 installed on a base 1, and a motor installed in the main body 2 rotates a screw-driven elevating shaft 3 and raises or lowers the device. ,
A seat is fixed to the upper end of the lifting shaft 3.

The device main body 2 is provided with a locking device 4 for the lifting shaft 3, and the locking device 4 is connected to one end of a link mechanism 6 by a pin 5.

The link mechanism 6 described above is attached to the device main body 2 by a fulcrum pin 7. A pedal rod 8 is integrally connected to the end on the fulcrum pin 7 side by a connecting pin 9.

The pedal rod 8 protrudes outward from the cover 10 of the main body 2, and is provided at its tip with a wing-shaped footboard 11 on both sides (see FIGS. 2 and 3). A limit switch 12 is fixed to the upper surface of each footboard 11 with the contact member 13 facing upward. Further, on the outside of the limit switch 12, a screw shaft 14 screwed into the bottom surface of the tread plate 11 is made to protrude from the top surface of the tread plate 11. This screw shaft 14
A coil spring 15 is fitted into the.

Further, the contact operation plate 17 fixed to the footboard 11 by the mounting screw 16 of the limit switch 12 is
Coil spring 15 from the top of limit switch 12
It is bent so that it reaches above the . This contact operation plate 17 has flexibility, and in a normal state, its tip rests on the coil spring 15 and lightly touches the contact operation plate 13. When this contact member 13 is pushed by a certain stroke a by a contact operation plate 17, it closes an internal contact. Further, the screw shaft 14 limits the downward movement of the contact operating plate 17 so that a force exceeding a certain stroke a does not apply to the limit switch 12.

The coil spring 15 described above is designed to have a spring constant such that it will not be compressed until a pedal force of a certain level or more is applied to the upper surface of the contact operation plate 17. In other words, the entire pedal must be lowered by a certain amount due to a pedal force exceeding a certain level, and the locking device 4 must be released.
The spring constant of the coil spring 15 is set so that the limit switch 12 does not operate.

A rubber cover 18 is attached to each footboard 11 to which the limit switch 12 and the like are attached. The rubber cover 18 is box-shaped with its lower and inner surfaces open, and is attached by engaging the outer circumferential edge of the footboard 11 with a groove 19 formed on the inner circumferential surface of the lower surface. A slight gap is formed between the upper surface of this rubber cover 18 and the contact operation plate 17, so that even if the molded thickness of the rubber cover 18 is uneven, the rubber cover 18 does not hit the contact operation plate 17. . Further, a rib 20 is provided protruding from the center of the upper surface of the footboard 11.

In FIG. 1, reference numeral 21 denotes a stopper, and when the pedal is lowered beyond a certain level, the stopper 21 hits the device main body 2 and limits the lowering.

The embodiment of this invention is as above,
Next, its effect will be explained.

Now, when the upper surface of the rubber cover 18 on either the left or right footboard 11 of the pedal is stepped on, as indicated by the chain line in FIG. 1, the pedaling force is transmitted to the footboard 11 through the rubber cover 18. In addition, when the rubber cover 18 is compressed beyond a certain level, the contact operation plate 17 and the rib 2
0 etc. and directly transmits the pedal force to the footboard 11.
As a result, the pedal rod 8 is lowered and the locking device 4 is actuated via the link mechanism 6 connected thereto to release the lock.

Further, when the pedal force increases, the coil spring 15 is compressed and the contact operation plate 17 is lowered. As a result, the contact member 13 is pushed down, and when it descends by the stroke a, the internal contact is closed and the motor is driven. The motor changes its direction of rotation depending on whether the actuated limit switch 12 is for raising or lowering, and raises and lowers the lifting shaft 3.

Incidentally, when the elevation or descent of the elevator shaft 3 reaches a certain limit, the motor is stopped by actuation of a limit switch (not shown). After stopping, lift the pedal to its original position and lock device 4.
operate in the lock direction.

[Effect of idea]

As mentioned above, this invention has limit switches for raising and lowering on the left and right footboards, so the pedal rod only needs to be fixed to the link mechanism, and the rotation mechanism around the axis is not required as in the conventional method. No longer needed. In addition, inspection and repair of the limit switch becomes easier.

Furthermore, since the limit switch is operated by a contact operation plate supported by an elastic body such as a coil spring, by setting the elasticity appropriately, the limit switch can be operated until the pedal force reaches a certain level. The operation of the limit switch can be restricted. Therefore, it is possible to reliably guarantee a stepwise operation in which the motor is driven after the locking device is activated.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the chair lifting device, FIG. 2 is a cross-sectional plan view of the step board portion, and FIG. 3 is a longitudinal sectional front view of the same. 1...Base, 2...Device main body, 3...Elevating axis,
4... Lock device, 6... Link mechanism, 7... Fulcrum pin, 8... Pedal rod, 11... Step board, 1
2...Limit switch, 13...Contact member, 1
5...Coil spring, 17...Contact operation plate, 18...
...Rubber cover.

Claims (1)

[Scope of utility model registration request] In a chair lifting/lowering operation pedal with treads protruding from both sides of the tip of the pedal rod, a limit switch for raising and lowering is provided on the top surface of each treadle, and a flexible contact operation plate is provided on the top surface of each limit switch. and the treadle, and the elastic body separates the contact operation plate from the limit switch by a certain distance, and the elastic body has an elasticity so that the elastic body is compressed when the pedal depression force increases beyond a certain level. A pedal for lifting and lowering a chair, characterized in that the pedal is set to a predetermined size.