JPS6357052B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bed, and more particularly to an adjustable bed in which a floor plate is raised relative to a frame.

Conventionally, in this type of bed, the floorboards were raised and lowered by operating a transmission mechanism using a motor, but when attempting to lower the floorboards, parts of the body, such as limbs, were caught between the floorboards and the frame. There was a risk that the product would be crushed and damaged. To prevent this from happening, a detection rope is placed on the bottom of the ramp that serves as the floorboard.
A bed is provided which connects the detection rope to switching means of the drive motor and is configured to actuate the switching means and stop movement of the drive motor when the detection rope contacts and is pushed by some object. (Jitko No. 53-43292). However, in this bed, parts of the body such as limbs or other objects are detected in areas where the detection rope is not stretched.
When it is sandwiched between the floorboard ramp and the frame,
The drive motor does not stop. In addition, even if the detection rope detects that a part of the body such as a limb or other object is pinched, and the drive motor stops, the part of the body such as a limb or other object remains as it is, so it is easy to There was a problem that the floorboard could not be removed from between the ramp and the frame.

An object of the present invention is to provide a bed that eliminates such problems, and its main purpose is to provide a bed with a sensing plate on the floorboard, and to place a sensing plate on the floorboard between the sensing plate and the frame. The bed is constructed so that when the part is pinched, a limit switch interposed between the motor and the power supply is turned off by a sensing plate, and at the same time, the engagement between the transmission mechanism and the floor board is released.

Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. In FIGS. 1 to 8, reference numeral 10 denotes a bed, which is provided with a frame 11. frame 11
is a headboard 12, a footboard 13,
It consists of two parallel connecting members 14, 15 that connect both boards 12, 13, and a pipe 16 that connects both connecting members 14, 15 at the lower part thereof.
Support pieces 17, 18 and 19 are fixed on the connecting member 14, and the left side of the support piece 17 is in contact with the right side of the headboard 12, and the right side of the support piece 19 is in contact with the left side of the footboard 13. The support piece 18 is located slightly to the left of the center of the connecting member 14. 20, 21 and 22 are connecting members 1
The left side of the support piece 20 is in contact with the right side of the headboard 12, the right side of the support piece 22 is in contact with the left side of the footboard 13, and the support piece 21 is in contact with the left side of the footboard 13. It is located to the left of the center and faces the support piece 18.

Reference numeral 23 denotes a fixed floor plate framed by pipes, which is supported and fixed to four support pieces 18, 19, 21, and 22, and its length in the transverse direction is approximately the same as the length of the footboard 13. Reference numeral 24 denotes an up/down floor board framed by pipes, and a pair of metal plates 25, 26 protrudes from the right end surface of the board.
6 is rotatably connected to a pair of metal plates 27 and 28 protruding from the left end surface of the fixed floor plate 23 by pins 29 and 30. A pair of arms 31 and 32 protrude downward and to the right from the center of the right end of the raising/lowering floor board 24, and when these arms 31 and 32 are operated by a motor 33, they are attached to the left via a transmission mechanism 34. When the floor plate 24 is pressed, the pins 29, 3
The left end of the raising/lowering floor plate 24 is separated from the support pieces 17 and 20 by rotating clockwise around 0.

Further, 70 is a sensing plate, the right end of which is the spring part 7.
0a and is fixed to the right end of the raising/lowering floor board 24, and the left end of the sensing plate 70 is connected to pins 71, 7.
It is supported by 2. However, pins 71, 7
2 is fixed to the left end of the up/down floor board 24, and the left end of the sensing plate 70 rotates around a spring portion 70a formed adjacent to the right end of the sensing board 70 as a fulcrum to approach the up/down floor board 24. It's becoming possible. When the sensing plate 70 approaches the up/down floor board 24, the limit switches 54a, 54 fixed to the up/down floor board 24 are activated.
b is turned off to stop the operation of the motor 33.

The motor 33 is fixed to a support plate 37 welded to the pipe 16 with bolts 35 and nuts 36. Therefore, a vibration isolating rubber 38 is interposed between the motor 33 and the support plate 37.
The vibration of the motor 33 is caused by the operation of the pipe 1.
6 to prevent it from being transmitted to the entire frame as much as possible. A bracket 39 is welded to the pipe 16 and holds a gearbox 41 with a screw 40. 42 is a worm shaft equipped with a worm gear 43, and an end portion 42a protrudes from the gear box 41. End 42a of this worm shaft 42
and the rotating shaft 33a of the motor 33 are connected via a flexible cable 44. Reference numeral 45 denotes a sleeve rotatably supported by the gear box 41. A gear 46 perpendicular to the worm gear 43 is attached to the outer periphery of the sleeve, and a threaded shaft 47 is threaded onto the inner periphery of the sleeve. There is. Then, as the motor 33 operates, the worm gear 43
When the screw shaft 47 rotates, the screw shaft 47 moves forward and backward relative to the sleeve 45.

A gap 48 is fitted to the left end of the screw shaft 47, and has a flange 49 on the periphery of its opening, and a tongue 50 protruding from its tip surface 48a. However, the tongue portion 50 of the lever is provided with a pin 51, and one end 51a and the other end (not shown) of the pin 51 are connected to elongated holes 52 bored in the arms 31, 32.
It passes through 53. Further, since the raising/lowering floor board 24 tries to rotate counterclockwise due to its own weight, one end 51a of the pin 51 engages with one end of the elongated hole 52 to create a clearance between it and the other end of the elongated hole 52. have. Although the other end of the pin 51 is not shown,
It engages with one end of the elongated hole 53 and has a clearance between it and the other end of the elongated hole 53.

Now, the electric circuit 55 for operating the motor 33 will be explained based on FIG.
6 is a power supply, 57 is a fuse, 58 is a transformer, 5
9 is a rectifier, 60 is a smoothing capacitor, 61 is a changeover switch, 62 is a rising relay, 63 is a falling relay, 65 is a contact of the rising relay 62, 66 is a contact of the falling relay 63, 67 is a capacitor,
68 is the main winding of the motor 33, 69 is the motor 3
With the auxiliary winding 3, the lever 61 of the changeover switch 61
When a is turned over and connected to the terminal 62a, the relay 62 is activated, and its contact 65 is closed and the motor 3 is connected to the terminal 62a.
The main winding 68 of the motor 33 is excited, and the rotating shaft 34 of the motor 33 rotates in the normal direction to raise the floor plate 24. Further, when the lever 61a is pushed down and connected to the terminal 63a, the relay 63 is activated and its contact 66 is closed. However, contact point 6
Since the two limit switches 54a and 54b connected in series with the motor 6 are normally turned on, the auxiliary winding 69 of the motor 33 is energized, and the rotating shaft 34 of the motor 33 is reversed in order to lower the floor plate 24. It's becoming like that. Note that the lever 61a can maintain a neutral position between the terminal 62a and the terminal 63a, so that neither the relays 62 nor 63 are activated.

To describe the operation of the above configuration, when the lever 61a of the changeover switch 61 is pushed down and connected to the terminal 62a, the motor 33 is activated, and its rotating shaft 34
rotates forward. The normal rotation of the rotating shaft 34 of the motor 33 is transmitted through a flexible cable 44 to a transmission mechanism 34, that is, a worm shaft 42 and a worm shaft 42.
The signal is transmitted to a gear 46 formed in the same direction. When the gear 46 rotates in the normal direction, the sleeve 45 also rotates in the normal direction, the screw shaft 47 moves to the left as seen in FIGS. Move and raise. When the motor 33 operates, it vibrates and generates noise (so-called chatter).
is attached to the pipe 16 via a vibration isolating rubber 38, and the rotary shaft 34 of the motor is connected to the transmission mechanism via a flexible cable 44, so vibrations are suppressed and the accompanying noise is also suppressed. becomes smaller. Arm 3 to transmission mechanism 34
1 and 32 are energized and the rotating raising/lowering floor plate 24 comes to the desired position, the lever 61a is connected to the terminal 62.
When it is moved away from a and brought to the neutral position, the motor 33 stops and the rotation of the up/down floor board 24 stops.

Next, when the lever 61a of the changeover switch 61 is turned down and connected to the terminal 63a, the rotating shaft 34 of the motor 33 is reversed and the screw shaft 47 is
As you can see in the diagram, it will move to the right. At the same time, the raising/lowering floor board 24 rotates counterclockwise under its own weight. At this time, when a part of the body such as a limb is connected to the connecting member 1
5, 16 and the sensing plate 70, limit switches 54a and/or 54b are turned off. On the other hand, the screw shaft 47 further advances to the right, and one end 51a of the pin 51 escapes toward the other end of the elongated hole 52, and the other end escapes toward the other end of the elongated hole 53. Therefore, the limit switches 54a and 54
As is clear from the circuit shown in FIG. 8, when either or both of b are turned off, the operation of the motor 33 is stopped.
2, 53, the raised/lowered floor plate 24 is not forced to rotate counterclockwise due to the movement of the screw shaft 47, and the part of the body such as the pinched limbs etc. No parts will be damaged.

As described above, the present invention provides a bed in which a transmission mechanism is actuated by a motor to raise and lower a floorboard relative to a frame. A sensing plate and a limit switch are provided on the floor plate, and a part of the body such as a limb or other object is sandwiched between the sensing plate and the frame. When the transmission mechanism is disengaged from the floor plate, the limit switch is turned off by the sensing plate at the same time, thereby cutting off the power supply to the motor, resulting in the following effects.

When a part of the body such as a limb or other object is caught between the sensing plate attached to the floor board and the frame, the sensing plate turns off the limit switch and cuts off the power to the motor. Compared to the case of detecting an object held by a rope, the sensing range can be expanded and safety can be increased.

A transmission mechanism that engages with one end of the elongated hole attached to the up/down floor board when the motor stops due to a limb or other body part being caught between the sensing plate attached to the up/down floor board and the frame. Since the pin also stops, parts of the body such as limbs and other objects can be easily removed by lifting the floor board so that the other end of the elongated hole engages with the pin.

[Brief explanation of drawings]

FIG. 1 is a plan view of one embodiment of the bed according to the present invention, FIG. 2 is a sectional view taken along the line of FIG. 1, and FIG.
The figure is a perspective view of the raising/lowering floor plate, Figure 4 is an enlarged view of section A in Figure 2, Figure 5 is a cross-sectional view along the line shown in Figure 2, Figure 6 is
The figure shows the state inside the gearbox, FIG. 7 is a view taken in the direction of arrow B in FIG. 5, and FIG. 8 is an electric circuit diagram for operating the motor. 11... Frame, 24... Lifting floor board, 31,
32...Arm, 33...Motor, 34...Transmission mechanism, 52, 53...Elongated hole, 54a, 54b...
...Limit switch, 70...sensing plate.

Claims (1)

[Claims] 1. In a bed in which a transmission mechanism is operated by a motor to raise and lower a floorboard relative to a frame, an arm provided with a long hole is attached to the floorboard, and an arm that passes through the long hole and is attached to one end of the long hole is attached to the transmission mechanism. Further, a sensing plate and a limit switch are provided on the floor plate, so that when a part of the body such as a limb or other object is squeezed between the sensing plate and the frame, the transmission mechanism and the floor plate are provided. The bed is configured to turn off the limit switch using the sensing plate at the same time the limit switch is disengaged from the motor, thereby cutting off power to the motor.