JPS605292B2 - electric bed - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric bed comprising a bed frame having a back riser and/or leg raiser driven by a motor.

Conventional Structure and Problems Conventionally, the drive unit of this type of electric bed consists of 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 coupling to this gear reduction mechanism. It is composed of a drive shaft connected through a member, and a pair of drive arms that are attached to both ends of the drive koji and rotate the back raising part and/or leg raising part of the bed frame. Its structure was complicated.

That is, as shown in FIG. 8, the coupling member is rotatably connected to a rectangular coupling sleeve 2' to which a rectangular drive shaft 1' is attached, and a support plate (not shown) that supports a gear reduction mechanism. It consists of a bearing sleeve 3' made of synthetic resin, and a spacer 5' for positioning the fan-shaped output stage gear 4'. A support shaft 6' provided therethrough passes through the drive shaft 1' and a drive arm 7' attached to both ends of the drive shaft 1' rotates about the support shaft 6'.

Note that the support ball 6' passes through the drive arm 7' and screws 8'.
It is fixed to a support 9' attached to a side plate (not shown) forming the outer frame of the bed. As described above, in the past, coupling members were constructed by combining many members, making assembly complicated and requiring a support shaft separate from the drive shaft. Furthermore, two drive arms are required, resulting in a large number of parts. Furthermore, since the mattress is simply layered on the bed frame, there is a risk that the mattress may shift. OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the prior art, and it simplifies the configuration of the drive unit and eliminates the need for a special abnormality detection device or clutch mechanism, and allows the bed frame to be moved, especially when lowering. Even if a hand or the like is caught between the outer frame of the bed and the bed frame, the rotation of the bed frame is stopped and furthermore, the bed frame and the mattress are prevented from shifting.

Structure of the Invention The present invention simplifies the structure by integrally forming the output stage gear of the gear reduction mechanism that constitutes the drive unit with the drive arm, and furthermore, separates the drive arm and the bed frame.
By having the drive arm supported by a rotatable roller provided on the bed frame, safety is ensured without the need for an abnormality detection device or clutch mechanism, and by integrating the bed frame and mattress, the mattress This is to prevent the occurrence of misalignment.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will now be described with reference to the accompanying drawings.

Figures 1, 2, and 3 show the overall structure of the bed. 1 is a wooden headboard, 2 is an iron frame body that connects to the headboard 1, and these make up the outer body of the bed. It consists of 3 is a back raising part 3a which can be freely rotated in a range of about 800 degrees, and leg raising parts 3c, 3 which can be freely rotated in a range of about 30 degrees.
d, and a bed frame having a fixed waist part 3b, the back raising part 3a and the waist part 3b, the waist part 3b and the first leg raising part 3c, and the first leg raising part 3c and the second leg raising part 3d. They are each rotatably connected with bolts and nuts 4.

Reference numeral 5 designates a mattress in which a wooden core part 6 and a cushioning part 7 are covered with an outer cover, and consists of a back part 5a, a waist part 5b, legs 5c and 5d, and a nut 8 is embedded in the core part 6, and the bed frame 3 and is fixed with bolts 9.

10 is a drive unit with a built-in motor, gear reduction mechanism, etc.
It is installed below the bed frame 3 in a state where it is supported by a drive part support shaft.

11 is the back part 3a and the first leg part 3c of the bed frame 3
The drive arm that moves the output stage gear of the gear reduction mechanism and the
Physically attached.

Reference numeral 12 denotes a hand switch for adjusting the angles of the back 3a and legs 3c of the bed frame 3, and is electrically connected to the motor so as to control the rotational direction and energization of the motor.

Note that the width of the mattress 5 is formed wider than the width of the frame body 2. FIG. 4 shows the configuration of the drive unit 10, in which motors 3 and 13', which can freely rotate in forward and reverse directions, are arranged symmetrically on the same axis.In the following explanation, only the power transmission path of the motor 3 will be explained.

A drive worm 5 is provided on the rotating shaft 14 of the motor 13, and is integrated with a fan-shaped output stage gear and an output stage gear 18 connected to a synthetic resin drive shaft sleeve 20' through a multi-stage gear mechanism 16. The configuration is such that the rotational force of the motor 3 is transmitted to the formed drive arm 11. 17 is a drive part support shaft, and this drive part support shaft 17 is attached to the drive shaft sleeve 2.
0 and fixed to the frame body 2, the driving part 1
It holds 0.

The output stage gear 18 has a back portion 3a of the bed frame 3.
A synthetic resin drive shaft sleeve 20 is fitted with a stop pin 19 for stopping the drive of the motor 13 when the leg 3c reaches the oo or 30o position, and the drive part support shaft 17 is made of iron. and the positioning spacer 21 of the output stage gear 18 in a rotatable manner, and the gear mechanism 1
It is attached to gear support plates 22 and 23 that support 6. The gear support plate 22 includes two microswitches 24,
24' is attached, and when the output stage gear 18 rotates to the terminal position, the stop pin 19 hits the micro switch 24 or 24', cutting off the current supply to the motor 13. ing. FIGS. 5, 6, and 7 show the relationship between the drive arm 11 and the bed frame 3, and the drive arm 11 is rotatable on a connecting fitting 25 fixed to the center of the back 3a and leg 3c of the bed frame 3. A roller shaft 27 is attached to hold the roller 26.

As the drive arm 11 rotates, the roller 26 slides on the end surface of the drive arm 11, and the back part 3a and leg part 3c of the bed frame 3 rotate. When the drive arm 11 and bed frame 3 descend, the bed frame If an object or hand gets caught in the bed frame 3, the drive arm 11 continues to descend, but since the bed frame 3 is not connected to the drive arm 11, the bed frame 3 stops on the spot, ensuring safety. Effects of the Invention As is clear from the above configuration, according to the present invention, since the drive arm is provided integrally with the output stage gear, the configuration is simplified, making manufacturing and assembly easier. Because it is integrated, the mattress does not shift even when the bed frame is moved up and down, and because the bed frame is placed inside the mattress, it has an excellent design, and the frame itself is placed inside the mattress. It is highly safe because it prevents people's feet or hands from getting caught between the bed and the bed frame, and since the drive arm and the bed frame connection fitting are not connected, there is no need for an abnormality detection device or clutch mechanism. It has excellent effects, such as being able to maintain safety even at low temperatures.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an electric bed according to an embodiment of the present invention, Fig. 2a is a front view of the bed, Fig. 2b is a plan view showing the relationship between the mattress frame body, and Fig. 3 is a mattress Plan view showing the relationship between the bed frame and the bed frame, Fig. 4 a, b
are a plan view and a front view of the drive unit of the same electric bed, No. 5
The figure is a partial perspective view showing the relationship between the drive arm and the back and legs of the bed frame, Figure 6 is a side view of the same part, Figure 7 is a front view of the same part, and Figure 8 is a drive for a conventional electric bed. FIG. 1...Headboard, 2...Frame body, 3...Bed frame, 3a...Back riser,
3c, 3d... Leg raiser, 5... Mattress,
5a...・Back, 5c, 5d...legs,
6... Mattress core village part, 7... Mattress cushion material part, 10... Drive part, 11...
... Drive arm, 13, 13' ... Motor, 16 ... Gear reduction mechanism, 17 ... Drive part support shaft, 18 ... Output Stage gear, 25...
... Connecting fittings, 26 ... Loaf 10 Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8

Claims (1)

[Claims] 1. A headboard and a frame body that constitute the outer casing of the bed, a drive unit that is attached to the outer casing and has a built-in motor and a gear reduction mechanism, and a back riser or leg raiser that is driven by the motor. a bed frame having at least one of the above, a rotatable back part and a leg part corresponding to the back raising part and the leg raising part of the bed frame; and a lower surface of the back raising part and the leg raising part of the bed frame. A connecting fitting fixed to the central part of the bed frame, a roller rotatably provided on the connecting fitting, and an output stage gear of the gear reduction mechanism are integrally formed, and the roller contacts the back of the bed frame. and a drive arm for raising and lowering a raising part or a leg raising part, the pinerest is made up of a cushion material part and a core part, the core part is fixed to the bed frame, and the width thereof is set to the width of the frame main body. An electric bed that is wider than the width.