JPS6125465Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a switch device for raising and lowering the floor of a bed or the like. For example, beds used by patients in hospitals, etc. can be raised and lowered by rotating the floor to allow patients to sit in a comfortable position while eating, reading, applying makeup, etc., or can be raised and lowered like a chair. Because the optimal height of the floor for examinations, bed making, and raising and lowering patients is different, there are those that allow the entire floor to be raised and lowered, and those that are designed to monitor the patient's blood circulation as part of treatment. There is one in which the entire floor is sloped in order to change the shape. Many of the conventional switch devices used to raise and lower the floor cannot be kept in the ON state, so when a nurse or the like raises or lowers a patient's back, the switch must be turned on and off while raising and lowering the floor by a predetermined amount. It was a huge loss of time as I had to keep pressing the button. Furthermore, if such a switch device is simply of a holding type, not only will it be cumbersome to release the holding after a small amount of elevation, but there will also be a risk of erroneous operation if the patient on the floor operates the switch by himself/herself. The present invention provides a switch device for raising and lowering the floor of a bed or the like, which eliminates these drawbacks, and will be described in detail below based on embodiments.

Reference numeral 1 denotes a switch box equipped with switches 2 and 2', and the switch box 1 is provided with an operating shaft 3. The operating shaft 3 is provided with an operating section 4 that turns on the switches 2, 2' starting at rotational positions b, b' at a predetermined angle in both directions from the neutral position a. Further, the operation shaft 3 is provided with a position c, which is rotated further than the rotational positions b and b' within the range in which the switches 2 and 2' are ON, while the operation shaft 3 is pivoted toward the neutral position a. A holding mechanism M for holding at c' is provided. In the embodiment shown in FIG. 2, an actuating cam 5 is provided on the operating shaft 3, and a protrusion on one side thereof is used as the actuating part 4, and the actuating part 4 operates the actuators 6, 6 of the left and right switches 2, 2'. It is a mechanism that is turned on by pressing '. Further, on the other side of the actuating cam 5, arcuate portions 9 and 9' are formed via a flat portion 7 and corner portions 8 and 8' on the left and right sides of the flat portion 7, and a leaf spring 10 is pressed against the other side. The holding mechanism M is constructed by the following. Further, the embodiment shown in FIG. 3a is provided with a coil spring 11 and a pressure plate 12 in place of the leaf spring 10 in the structure shown in FIG.
Furthermore, in the configuration of FIG. 3b, a magnet N _{1 is provided near the other side of the operating cam 5 of FIG. 2, and the magnet N 1 is} provided on the other side of the operating cam 5 corresponding to the neutral position a.
A holding mechanism M is constructed by providing a magnet S of opposite magnetism, and magnets _{N 2 and} N ₂ ' having the same polarity as the magnet N 1 on the left and right sides thereof. In addition to the above, the configurations of the switches 2, 2' and the actuator 4 that turns them ON and OFF include, for example, a configuration that turns ON and OFF by transmitting or blocking light, and a configuration that turns ON and OFF by transmitting or blocking light, or by the presence or absence (or a little) of magnetism.
Any configuration that performs ON-OFF may be used as appropriate. The holding mechanism M also springs the operating shaft 3 toward the neutral position a and holds it at a position further rotated than the rotational positions b and b' within the range where the switches 2 and 2' are ON. Any mechanism other than the above may be used, such as a snap mechanism using an over-center mechanism. Incidentally, reference numerals 19 and 20 in the figure are guide pins or guides for setting the rotation range of the actuating cam 5.

In the above configuration, the present invention includes an appropriately configured operating lever 13 on the operating shaft 3, and a switch box 1.
It is attached to an appropriate location such as the side part 15 of a floor plate of a bed 14 or the like, and is used by performing predetermined wiring via a floor lifting electric motor 16 and a connector 17. In the present invention, the switches 2 and 2' in the switch box 1 may be switches configured to directly control the electric motor 16, or may be switches such as relays or SCRs.
It may also be possible to control it indirectly via an appropriate drive circuit using, etc.

In such a configuration, when the floorboard is raised or lowered or the entire floor is raised or lowered, when the operating shaft 3 is rotated counterclockwise using the operating lever ₁₃ as shown in FIG. operating cam 5
The operating portion 4 of the switch 2 reaches a position where it pushes the actuator 6 of the switch 2, and from this point on, the switch 2 is turned on and the electric motor 16 is operated. In the state of the rotation angle θ ₁ , the leaf spring 10 is attached to the left corner 8 of the operating cam 5.
The actuating cam 5 is in pressure contact with the actuating cam 5, thereby imparting a clockwise moment to the actuating cam 5, that is, the actuating shaft 3 is urged toward the neutral position. Therefore, in this state, the operating lever 1
When the user releases his/her hand from 3, the operating shaft 3 returns to the neutral position a due to the above-mentioned bounce, the switch 2 is also turned off, and the operation of the electric motor 16 is stopped. The above return operation of the operating shaft 3 is performed even when the operating shaft 3 is rotated by a predetermined angle beyond the rotation angle θ ₁ , and the switch 2 is also rotated by a predetermined angle.
It is in the ON range. When the operating shaft 3 reaches a predetermined rotation angle θ ₂ , the leaf spring 9 comes into pressure contact with the arcuate portion 9 on the left side of the left corner 8, and therefore no longer applies any moment to the operating cam 5. There is no rebound in the direction of the neutral position a of the shaft 3. Therefore, in this state, even if you release your hand from the operating lever 13, the operating shaft 3 will not return to the neutral position a, and the switch 2 will not return to the neutral position a.
The operation of the electric motor 16 maintained in the ON state continues. The operation shaft 3 is returned from this state by applying a return force using the operation lever 13. The holding mechanism M shown in FIGS. 2 and 3a described above has a structure that simply does not apply a moment in the return direction at the position c, but in addition, the holding mechanism M shown in FIG.
As shown in the mechanism, after the rotation angle θ ₂ is exceeded, a moment in the opposite direction to the return direction may be actively applied by the repulsive force between the magnets N ₁ and N ₂ ′. Such a mechanism may be constructed as appropriate, such as a snap mechanism using a well-known over-center mechanism.

According to the above-described operation, the present invention operates the electric motor 16 by rotating the operating lever 13 to one side and turning on the switch 2.
8 can be raised, and the back floor plate 18 can be lowered by rotating it to the other side and turning on the switch 2'. In such a case, if the operating shaft 3 is rotated by a predetermined angle θ ₂ or more, it will be held in that position, so even if the operating lever 13 is released, the switches 2 and 2' can be maintained in the ON state. Since the floor can be raised and lowered continuously, it is no longer necessary to keep pressing a switch as in the past when raising or lowering the floor to a preset position, reducing the time and labor burden on nurses, etc. can be significantly reduced. In this case, a limit switch is provided at a suitable location in the electric motor 16 or the lifting mechanism, and the electric motor 1 is turned off after lifting a predetermined amount.
Of course, it is necessary to stop 6. Next, in the present invention, when the floor is rotated within the predetermined angle _θ2 , a return force is always applied by the spring of the operation shaft 3, so when the floor is raised or lowered in this state, Simply by releasing the operating lever 13 at a predetermined position, the switches 2 and 2' can be automatically turned OFF to stop the vertical movement. Therefore, it has the feature that it is not troublesome to operate when ascending and descending slightly, and when used by a patient himself, there is a risk that he may continue ascending and descending due to malfunction even though he is in an insufficient position. , so-called failsafe can be achieved. In order to make this fail-safe even more effective, the switch box 1 may be provided with an appropriate regulating means for regulating the maximum rotation angle of the operating shaft 3 to less than the angle θ ₂ when necessary; The force required to rotate by an angle θ ₂ or more may be increased.

As described above, in the present invention, when the rotation angle of the operating shaft by the operating handle is less than a predetermined angle, the operating shaft is automatically returned to the neutral position, and when the rotation angle is greater than the predetermined angle, the operating shaft is held at the rotating position. Therefore, the time and labor burden on nurses etc. can be reduced, and
It has the characteristic of improving safety for patients and the like.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention; FIG. 1a is an explanatory external view, FIG. 1b is an explanatory external view showing how it is attached to a bed, and FIGS. 2a and b are examples of the configuration and operation. FIGS. 3A and 3B are enlarged explanatory views of important parts showing the configuration and operation of another example. Code, 1...Switch box, 2, 2'...Switch, 3...Operating shaft, 4...Operating part, 5...Operating cam, 6, 6'...Actuator, 7...Flat part, 8 , 8'... Corner part, 9, 9'... Arc part, 10
... Leaf spring, 11 ... Coil spring, 12 ... Pressure plate, 13 ... Operation lever, 14 ... Bed, 15 ...
...Side frame, 16...Electric motor, 17...Connector, 18...Back floor plate, 19...Guide groove, 20...
... Guide pin, M ... Holding mechanism, a ... Neutral position,
b, b'... Rotation position, N ₁ , N ₂ , N ₂ ', S... Magnet.

Claims (1)

[Scope of utility model registration request] A switch box equipped with a switch has an operating axis,
The operating shaft is provided with an actuating portion that turns on the switch starting from a rotation position of a predetermined angle in both directions from the neutral position, and the operating shaft is further provided with an actuating portion that flips the switch toward the neutral position, Lifting/lowering operation of a floor of a bed or the like, characterized in that a holding mechanism is provided to hold the switch at a position further rotated than the rotational position in the ON range, and an operation lever is configured on the operation shaft. switch device.