JPS6022926B2 - Electric bed stop device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for stopping the bed frame at a predetermined position in an electric bed in which the back and/or legs of the bed frame are rotated by a predetermined angle by a drive unit with a built-in motor. This is related to the improvement of the stop diamond.

As shown in FIG. 7, the drive unit of this type of electric bed is composed of a motor 1' that can freely rotate in forward and reverse directions, and a motor 1'.
A gear reduction mechanism 3' connected to the rotating shaft 2' of the gear reduction mechanism 3', a square drive shaft 5' to which the final gear 4' of the gear reduction mechanism 3' is fixed, and a drive shaft 5' attached to both ends of the drive shaft 5'. , a pair of drive arms (not shown) that rotate the back or legs of the bed frame (not shown),
In order to cut off the power to the motor 1' and lock the bed frame in a predetermined position, a limit switch 7' consisting of a microswitch is attached to the gear support plate 6' that supports the gear reduction mechanism 3'. 5' and final stage gear 4
A control cam portion 9' for operating a limit switch is provided on a synthetic resin bearing sleeve 8' which is connected to the gear support plate 6' and is rotatably joined to the gear support plate 6'. When the bed frame rotates by a predetermined angle (when the back or legs of the bed frame rotates by a predetermined angle), the current supply to the motor 1' is cut off.

Further, a stopper is separately provided to prevent the final stage gear 4' from coming out of mesh and to fix the terminal end in case the limit switch 7' fails. As described above, in the conventional electric bed stopping device, the control cam part 9 is attached to the bearing sleeve 8'.
' is provided to detect the thinness, and its structure is complicated, and the positioning of the control cam part 8' and the final stage gear 4' requires some ingenuity.

Additionally, a separate stopper was required to ensure safety. The present invention has been made in view of the above-mentioned conventional drawbacks, and embodiments of the present invention will be described below with reference to the accompanying drawings. Figures 1 and 2 show the overall structure of a bed according to an embodiment of the present invention, in which 1 is a wooden headboard, 2 is a wooden headboard;
3 is a wooden footboard, and 3 is a wooden side plate that connects the headboard 1 and the footboard 2, and these constitute the outer body. 4 is a back part 4 that can be rotated within a range of about 8 pins.
This bed frame has leg portions 4b that are rotatable within a range of about 30 degrees and about 30 degrees.A plurality of slatted boards 6 are attached to the bed frame 4 for laying a mattress 5 thereon.

Reference numeral 7 denotes a drive unit containing a motor and a gear reduction mechanism, and is installed below the bed frame 4.

Reference numeral 8 denotes a drive arm for rotating the back portion 4a and leg portions 4b of the bed frame 4, and is fixed to both ends of a drive wheel 9 to which the final stage gear of the gear reduction mechanism is attached.

The stove 0 is a hand switch that adjusts the angles of the back 4a and legs 4b of the bed frame 4, and is electrically connected to the motor so as to control the rotational direction and energization of the motor.
3a to 3c show the configuration and operation of the drive unit, in which a drive worm 13 is provided on the rotating shaft 12 of a motor 11 that can freely rotate in forward and reverse directions, and a multi-stage gear reduction mechanism 14.
The rotational force of the motor 11 is transmitted to the sector-shaped final stage gear 15 connected to the drive shaft 9 via the drive shaft 9.

Reference numeral 16 denotes a gear support plate that supports the gear reduction mechanism 14 and the bearing sleeve IT attached to the stage drive shaft 9. On this gear support plate 16, a position detection pin 18 fixed to the final stage gear 15 detects the rotation of the final stage gear 15. An elongated hole 19 having a shape corresponding to the locus drawn by is provided.

The opening and closing of 20 and 21 is controlled by the position detection pin 18,
A limit switch consisting of a normally-closed microswitch that controls energization to the motor 11.
It is fixed at

In the above configuration, FIG. 3a shows a state in which the position detection pin 18 is in contact with the actuating piece 20a of the lower layer detection glue limit switch 20 and the actuating piece 20a is pressed; in this state, the limit switch 20 is OFF, and limit switch 21 is ON.

Therefore, even if the down side switch of the hand switch 10 is pressed, the motor 1 is not energized, and only the up side is activated. When the up side switch of the hand switch 10 is pressed, the motor 11 is energized for the period of time during which the switch is pressed, and the back 4a or leg 4b of the bed frame 4 rises.
If the pressure is continued, the register detection pin 18 will eventually come into contact with the operating piece 21a of the upper layer detection limit switch 21, turning off the limit switch 21 and cutting off the power to the motor 11. This limit switch 21
In the power-off state, contrary to what was described above, only energization of the motor 11 in the downward direction is effective. In Figs. 3b and 3c, the final stage gear 15 rotates and the position detection pin 18 reaches the hole 19.
This shows the state in which the final stage gear 1 has been repositioned at both ends.
This is the limit position at which the engagement between gear 5 and the front gear does not disengage, and further lowering or rising is restricted. Therefore, even if the limit switches 20 and 21 fail and the motor il is erroneously energized, if the position detection pin 18 supports both ends of the innermost hole 19, further lowering or rising can be prevented. . 4 to 6 show other embodiments of the present invention, in which the final stage gear 15 of the gear reduction mechanism 1 and the drive arm 8 are integrally formed, and the drive arm 8 and the drive arm 8 are rotatable. The back part 4a and leg part 4b of the bed frame 4 attached to the bed frame 4 are rotatably connected via a connecting arm 22, and the deceleration mechanism and stopping device are the same as those described above. , final stage gear 1
5 and the drive arm 8 are integrally formed, only one drive arm 8 is required, and the drive shaft 9 is also unnecessary, and the drive arm 8 and the final stage gear 15 are rotatably mounted on the fixed shaft 23. Just do it. As is clear from the above description, according to the present invention, the position detection pin fixed to the final stage gear of the gear reduction mechanism operates the limit switch attached to the gear support plate. Since the position is directly detected, the detection position accuracy is improved, and more reliable control can be performed.In addition, the configuration is simplified because the conventional control cam is not required, and the position detection pin serves as a stopper, so it is possible to prevent the final stage gear from disengaging without the need for a special stopper, and it also has excellent effects such as ensuring safety in the event of a limit switch failure. It is something.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of an electric bed showing an embodiment of the present invention, Figs. 2 a and b are plan and front views showing the bed with the mat removed, and Figs. 3 a, b, c is a front view showing the configuration and operation of the drive unit of the bed, Fig. 4 is an external perspective view of an electric bed showing another embodiment of the present invention, and Figs. 5a and b are views of the bed with the mat removed. FIG. 6 is a front view showing the configuration of the drive unit of the bed, and FIGS. 7a and b are a plan view and front view of the drive unit of the secondary electric bed. . 4... Bed frame, 4a... Leg portion, 7... Drive unit, 8... Drive arm, 11... Motor, 14... Gear reduction mechanism, 15... Final stage gear, 16... Gear support plate, 18...Position detection pin, 19...Elongated hole, 20, 21...Limit switch. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Ship diagram

Claims (1)

[Claims] 1. A motor that can freely rotate in forward and reverse directions, a gear reduction mechanism connected to the rotating shaft of this motor, and a gear reduction mechanism connected to this gear reduction mechanism,
a drive arm that rotates at least either the back or the legs of the bed frame that is rotatably attached; a position detection pin is fixed to the final stage gear of the gear reduction mechanism; An elongated hole corresponding to the locus of the position detection pin as the final stage gear rotates is provided in the gear support plate that supports the gear, the position detection pin is passed through the elongated hole, and the position detection pin is passed through the elongated hole, and An electric bed stopping device comprising a limit switch located on the gear support plate, the opening and closing of which is controlled by the position detection pin, and which controls energization of the motor.