WO1997015263A1

WO1997015263A1 - Reclining drive device for medical bed

Info

Publication number: WO1997015263A1
Application number: PCT/JP1995/002185
Authority: WO
Inventors: Akio Hori; Hitoshi Chiba; Yoshihisa Kinoshita
Original assignee: Tsubakimoto Chain Co.
Priority date: 1995-10-24
Filing date: 1995-10-24
Publication date: 1997-05-01
Also published as: KR970706786A; KR100221537B1

Abstract

A reclining drive device (50) comprises an output shaft (58) driven by an electric motor (52) in a casing (51), a transmission shaft (54) and the like. The transmission shaft (54) is shaped to engage with both of a reclining operating shaft (27) and the output shaft (58). The casing (51) is formed with a pair of engaging grooves (64) which are adapted to engage with a cylinder mounting bolt (63). When the engaging grooves (64) are made to engage with the cylinder mounting bolt (63) and a projecting piece (62) of the transmission shaft (54) is inserted into a groove (31) of the reclining operating shaft (27), the reclining drive device (50) is mounted to a medical bed.

Description

Description Reclining drive for medical beds Technical field

TECHNICAL FIELD The present invention relates to a reclining drive device for converting an existing manual medical bed having a manual reclining mechanism into an electric medical bed. Background technology

Conventionally, the medical bed 20 (see Fig. 17) is a manually operated medical bed provided with a manual reclining mechanism 21.

The manual reclining mechanism 21 includes a cylinder 23 that converts the manual rotary motion of the crank handle 22 into linear motion, and a linear motion lever 24 of the cylinder 23 that is connected to a medical bed body 25. It is composed of a lifting lever 26 that tilts the part.

There are two types of connecting mechanisms for connecting the crank handle 22 to the reclining operation shaft 27 of the reclining mechanism 21, as shown in FIGS.

In the connecting mechanism 30 shown in FIG. 18, the groove 31 and the ridge 32 are engaged with each other, and the connecting state is maintained by the through pin 33. As shown in FIG. The crank handle 22 can be removed from the reclining operation shaft 27 by pulling out the penetrating pin 33.

In the connecting mechanism 40 shown in FIG. 19, the driving pin 41 and the driving groove 42 on the reclining operation shaft 27 are engaged with each other, and the connected state is maintained by the traction of the spring 43. there is Crank handle 22 (see Fig. 20) When not in use, it is pulled by the spring 43 with the hinge pin 44 and the long hole 45 as guides to prevent the reclining operation shaft 27 from engaging. It is removed so as not to protrude outside the medical bed 20 . Also, the crank handle 22 can be removed from the reclining operation shaft 27 by pulling out the hinge pin 44.

However, the manual medical bed 20 having the crank handle 22 in this way must be reclining by turning the crank handle 22 by hand, which is quite hard work, and many people in hospitals need to do this. The problem is that nurses are frequently forced to perform non-medical work when medical beds are installed. The same is true for caregivers at home.

In order to relieve this heavy labor, there is an electric medical bed with an electric recliner, but since this electric medical bed is expensive, it is difficult to replace the existing manual medical bed with a manual reclining mechanism. There is an economic problem in discarding 20 and introducing a new one.

The object of the present invention is to use an existing manual medical bed with a manual reclining mechanism as it is and convert it into an electric medical bed, so that nurses or caregivers can be relieved from heavy reclining work. To provide a reclining drive device for

Another object of the present invention is to provide a reclining drive device capable of stopping a tilting lever in a predetermined posture without overloading the device itself. Invention disclosure

The present invention provides a reclining chair to which a crank handle is detachably attached. The reclining operation shaft and the output shaft are aligned with a casing of a speed reducer with a motor that has an output shaft that engages and disengages from one end of the reclining operation shaft via a transmission shaft, and the casing is mounted on the casing. A reclining bed for a medical bed, which is provided with support metal fittings attached to a bed frame, both ends of the transmission shaft are formed to be removably engaged with the output shaft, and reclining operation shafts from which the crank handle is removed are removably formed. Provide a drive. In this reclining drive device, the crank handle is removed from the reclining operation shaft, the engaging portion formed on the transmission shaft is engaged with the crank connecting portion to which the crank handle was connected, and the supporting fitting of the casing is attached to the medical bed. It is attached to the medical bed together with the casing by engaging with the frame.

When the motor is activated, the reclining operation shaft rotates via the output shaft and the transmission shaft, and a part of the manual medical bed is raised and lowered.

In this way, by removing the crank handle and then installing the reclining drive in an existing manual medical bed, the manual medical bed can be converted into an electric medical bed and used by nurses or caregivers. workers are freed from heavy reclining work.

Further, the present invention comprises a reclining detection shaft that decelerates and rotates the output shaft, a pair of reclining detection cams that are phase-changeable on the detection shaft, and a rotation of the output shaft that is activated by the cams. A recliner drive for a medical bed with a limit switch for stopping.

Generally, the forward limit and backward limit of the linear motion rod that tilts the bed are detected by an overcurrent protection device of the electric motor, and the electric motor is stopped. However, in such a case, excessive force acts on the main body of the driving device, and the mechanical life of the entire device is significantly reduced. Therefore, in the present invention, a reclining detection shaft that decelerates and rotates the output shaft is provided, and a limit switch detects a cam that is pivotally attached to the detection shaft to stop the rotation of the output shaft. Deceleration from the output shaft to the detection shaft is performed at a reduction ratio greater than the maximum rotation speed of the reclining operation shaft.

In addition, there are various types of medical beds, but by making it possible to change the phase of each cam with respect to the detection axis, each cam can be adjusted to correspond to the forward and backward limits of the linear motion rod. . Brief description of the drawing

FIG. 1 is a front view of a reclining drive device according to an embodiment of the present invention, shown partially in section.

FIG. 2 is a view of FIG. 1 viewed from the right side.

3 is a top view of the reclining drive device in FIG. 1. FIG.

FIG. 4 is a schematic view of FIG. 1 viewed from the left.

FIG. 5 is a front view of a reclining drive device according to another embodiment of the present invention, shown partially in section.

FIG. 6 is a view of FIG. 5 viewed from the right side.

FIG. 7 is a top view of the reclining drive device in FIG. 5, with the casing section cut away.

8 is a schematic cross-sectional view taken along arrow 8-8 in FIG. 7. FIG.

FIG. 9 is a front view of a reclining drive device according to still another embodiment of the present invention, shown partially in section.

10 is a cross-sectional view of the inside of the driving device of FIG. 9. FIG.

Fig. 11 is a plan view showing the relative positions of the cam and the limit switch; be.

FIG. 12 shows a support fitting of the connector of FIG. 9, (a) being a front view and (b) being a side view.

FIG. 13 is a front view of a reclining drive device according to still another embodiment of the present invention, shown partially in section.

Fig. 14 shows the support fitting of the connector of Fig. 13, (a) is a front view, (b) is a side view, and (c) is a bottom view.

FIG. 15 is a front view of a reclining drive device according to still another embodiment of the present invention, shown partially in section.

Fig. 16 shows the support fitting of the connector of Fig. 15, (a) is a front view, (b) is a side view, and (c) is a bottom view.

Fig. 17 is a schematic front view of a medical bed;

Fig. 18 is a perspective view of a connecting mechanism of a crank handle;

Fig. 19 is a front view of another connecting mechanism of the crank handle;

FIG. 20 is a front view showing the unused state of the crank handle in FIG. 11; BEST MODE FOR CARRYING OUT THE INVENTION

FIGS. 1-4 show a reclining drive 50 attached to a manual medical bed 20 having a coupling mechanism 30 shown in FIG.

This reclining drive device 50 is composed of a casing 51, an electric motor 52, a reduction mechanism 53, a transmission shaft 54, and the like.

The electric motor 52 is attached to the casing 51. A worm 56 is attached to the rotary shaft 55 of the electric motor 52. The worm 5-6 is in contact with the worm wheel 5-7. Worm 5 6 and Worm Hoi The rule 57 constitutes a speed reduction mechanism 53.

The output shaft 58 of the worm wheel 57 is supported by the worm case 59. The worm case 59 is attached to the casing 51 by means of mounting legs 60 , 60 integral with the worm case 59 .

A transmission shaft 54 is attached to the tip of the rotating shaft 58 of the worm wheel 57 by a knock pin 61 . A projecting piece (engaging portion) 62 is formed at the tip of the transmission shaft 54 . The projecting piece 62 engages with the groove (crank connecting portion) 30 of the reclining operation shaft 27 of the medical bed 20 shown in FIG.

The casing 51 is formed with a pair of engaging grooves 64 that engage with two cylinder mounting bolts (attached portions) 63, 63. As shown in FIG. The cylinder mounting port 63 is a port for mounting the bracket 65 attached to the cylinder 23 to the suspension fitting 66 attached to the medical bed 20 .

A control circuit 67 is provided within the casing 51 . The control circuit 67 is a circuit that rotates the electric motor 52 forward and backward by operating a push button switch (not shown) at hand. The control circuit 67 also has an overload protection function for the electric motor 52.

Next, how to use the reclining drive device 50 will be explained.

First, pull out the penetrating pin 33 of the manual medical bed 20 shown in FIG. Next, the engagement groove 64 of the casing 51 of the reclining drive device 50 is engaged with the cylinder mounting bolt 63. At the same time, the projection 62 of the transmission shaft 54 is inserted into the groove 31 of the reclining operation shaft 27. If there is a relative positional deviation between the projecting piece 62 and the groove 31, manually rotate the projecting piece 62 to adjust the position. After that, the fixing bolt 68 is screwed into the casing 51, and the tip of the fixing bolt 68 presses the outer circumference of the bracket 65. this Thus, the reclining drive device 50 is attached to the medical bed 20.

Then, the electric motor 52 is started by operating the push button switch at hand. The rotational force of electric motor 52 is transmitted through worm 56, worm wheel 57, output shaft 58, dowel pin 61, transmission shaft 54, projecting piece 62, and groove 31 of reclining operation shaft 27. It is transmitted to the reclining operation shaft 27 via. As a result, a portion of the medical bed body 25 (see Fig. 17) is tilted. Thus, by installing the reclining drive device 50 instead of the crank handle 22, the manual medical bed is converted into an electric medical bed.

FIGS. 5-8 show a recliner drive 70 attached to a manual medical bed 20 with the coupling mechanism 40 shown in FIG.

This reclining drive device 70 also comprises a casing 71, an electric motor 72, a reduction mechanism 73, a third spur gear (output shaft) 74, and the like. The electric motor 72 is attached to the casing 71. A worm 76 is attached to the rotating shaft 75 of the electric motor 72 . The worm 76 is attached to the worm wheel 77. A rotating shaft 78 of the worm wheel 77 is supported on the worm case 79. The worm case 7-9 is attached to the casing 7-1. The tip of the rotating shaft 78 is fixed to the first spur gear 80 by a known fastening device 92. The first spur gear 80 is supported by the rotating shaft 78 of the worm wheel 77 and the casing 71 . The first spur gear 80 meshes with the second spur gear 81 . The second spur gear 81 is rotatably provided on a support shaft 82 by a bearing 83. Both ends of the support shaft 82 are supported by the casing 71. The second spur gear 81 is engaged with the third spur gear 74. One side surface of the third spur gear 74 is rotatably provided on a holding member 84 provided on the casing 71 . third flat The gear 74 has a hole 85 through which the reclining operation shaft 27 passes, and a pin receiving groove (engagement portion) in which the drive pin (crank connection portion) 41 on the reclining operation shaft 27 is engaged. 8 and 6 are formed. The pin-receiving groove 86 has a widening entrance so that the drive pin 41 can be easily received. The casing 71 is formed with engaging grooves 88, 88 that engage with a bracket (mounted portion) 89. As shown in FIG. The bracket 89 is attached to the cylinder 23, and is provided to the hanging fitting 90 by the cylinder mounting port 87. Suspension bracket 90 is attached to medical bed 20 .

Next, how to use the reclining drive device 70 will be explained.

First, pull out the hinge pin 44 of the manual medical bed 20 shown in FIG. Next, the engagement groove 88 of the casing 71 of the reclining drive device 70 is engaged with the bracket 89. At the same time, the reclining operation shaft 27 is inserted into the hole 85 of the third spur gear 74, and the tip of the reclining operation shaft 27 is supported by the casing 71. At this time, the driving pin 41 on the reclining operation shaft 27 enters the pin receiving groove 86 of the third spur gear 74. If there is a deviation in the relative position between the driving pin 41 and the pin receiving groove 86, the third spur gear 74 is manually rotated so that the driving pin 41 and the pin receiving groove 86 are aligned. position. After that, the fixing bolt 91 is screwed into the casing 71, and the tip of the fixing bolt 91 presses the outer circumference of the bracket 89. With this, the reclining drive device 70 is attached to the medical bed 20.

Then, a push button switch (not shown) at hand is operated to start the electric motor 72. The rotational force of electric motor 72 is generated by worm 76, worm wheel 77, first, second and third spur gears 80, 81, 74, pin receiving groove 86, driving pin 41 is transmitted to the reclining operation shaft 27 via the As a result, a portion of the medical bed main body 25 (see Fig. 9) is tilted. Thus, by installing the reclining drive device 70 instead of the crank handle 22, the manual medical bed is converted into an electric medical bed.

The reclining drive device 50 shown in FIGS. 1 to 4 is used when the reclining operation shaft 27 is located deep in the medical bed 20, and the reclining drive device shown in FIGS. 5 to 8 is used. 7 0 is used when the reclining operating axis 2 7 is located near the outside of the medical bed 2 0 . For this reason, the reclining drive device 70 shown in FIGS. 5 to 8 has the first to third spur gears 80, 81, 74 attached to the medical bed so as not to protrude outside the medical bed 20. They are arranged in the width direction of the door 20 and have a flat shape. 9 to 12 show still another embodiment. The reclining drive device 100 of this embodiment has a device protection mechanism. The protection mechanism stops the electric motor 102 when the reclining angle reaches the maximum and when the reclining angle reaches the minimum. That is, the electric motor 102 is stopped when the linear motion rod reaches the forward limit and the backward limit.

The protection mechanism includes a reclining angle detection shaft 104 arranged in a casing 103, a pair of cams 105 and 106 attached to the detection shaft 104, and cams 105 and 106 attached to the detection shaft 104. It has limit switches 107, 108 activated by 5, 106.

The reclining angle detection shaft 104 interlocks with the output shaft 110 and rotates through two gears 109 . What is important is the reduction ratio. Normally, the output shaft 110 rotates 40-50 at maximum. When using the limit switches 107, 108, the number of revolutions of the detection axis 104 must be less than 360°. Therefore, in this embodiment, the speed reduction ratio is set to 70. Needless to say, a worm or planetary gear train can be used to obtain a constant reduction ratio. stomach.

A pair of cams 105, 106 are for activating limit switches 107, 108 to stop the electric motor 102 and the output shaft 110. One cam 105 is a linear moving rod forward limit detection cam, and the other cam 106 is a linear moving rod backward limit detecting cam. Each of the cams 105, 106 can change the phase with respect to the reclining angle detection axis 104. For example, when the linear motion rod is at its forward limit, the phase is adjusted so that the cam 105 activates the limit switch 107. Pressing against the surface of 4 locks the cam 105 in place.

The limit switches 107 and 108 activated by the cams 105 and 106, know that the reclining operation shaft 101 should not rotate any more, and the electric motor 102 to stop This protects the equipment and thus the medical bed.

In this embodiment, the stopping of the electric motor 102 is adjusted by changing the phases of the cams 105 and 106, but the following configuration may be used. That is, the cam may be fixed to the detection shaft 104 and the position of the limit switch may be changed. For example, the bottom of the casing 103 is formed in an arc shape, and a slider that can move concentrically with the detection axis 104 along the bottom is provided. The slider is fixed in place with a screw or the like. Install a limit switch on the slider. By adjusting the positions of the slider and limit switch, the forward limit and backward limit of the linear motion rod can be detected. The embodiment of Figures 9-12 includes an improved connector configuration. The connector 111 is a device for connecting a standardized and unified driving device to a wide variety of medical beds. The connector 1 1 1 is connected to the driving device 1 0

Support bracket 112 for fixing 0 to the medical bed, and drive unit 100 It has a transmission shaft 113 for connecting the output shaft 110 to the reclining operation shaft 101.

The connector 111 of this embodiment comprises a support metal fitting 112 for fixing the driving device 100 to the bed frame 114, and an output shaft 110 connected to the reclining operation shaft 101 with a hexagonal hole. It has fittings 1 1 3 for connection.

The support fitting 112 is fixed to the casing 103 of the driving device 100. Then, the support bracket 112 is suspended from the bed frame 114, and when the bolt 114 screwed to the bottom surface is pressed against the bed frame 114, the driving device 100 is attached to the bed frame 114. be done.

1 to 8 are integral with the casing, but the drive device can be standardized by separating the support metal fittings 112 from the casing as in this embodiment. · Unification can be achieved.

The fitting 113 is inserted into the notched circular output shaft 110 of the driving device 100 and fixed with a screw. The hexagonal tip of the fitting 113 is inserted into the reclining operation shaft 101 with a hexagonal hole.

Figures 13 and 14 show another embodiment of the connector. The support fitting 121 of the coupling 120 of this embodiment is for fixing the driving device 123 to the medical bed 124 using the cylinder mounting port 122. . The support fitting 121 is fixed to the casing 125 of the driving device 123. Then, insert the pair of arms 126 between the hanging bracket 127 and the cylinder 128, insert the cylinder mounting bolt 122 into the engagement groove 129, and tighten the bolt 12 2 is tightened, and the port 131 screwed into the tongue 130 is pressed against the cylinder 128, and the drive device 123 is attached to the bed frame 132. The joint metal fitting of this embodiment uses the driving pin 133 to transmit the rotational force from the output shaft 134 to the reclining operation shaft 135 . One end of the fitting 136 is inserted into the notched circular output shaft 134 of the drive device 123. and secured with screws. Also, the other end of the fitting 136 is inserted into the reclining operation shaft 135 . At this time, the driving pin 133 is housed in the pin receiving groove 137 formed at the tip of the joint metal fitting 136 .

Figures 15 and 16 show still another embodiment of the connector. The support fitting 141 of the coupling 140 of this embodiment is for fixing the driving device 143 to the medical bed 144 using the cylinder mounting port 142. . The support fitting 141 is fixed to the casing 145 of the driving device 143. Then, insert the pair of arms 146 between the suspension fitting 147 and the cylinder 148, and insert the cylinder mounting port 142 into the suspension fitting 147 and the arm 146. When the bolt 142 is tightened, the driving device 143 is attached to the bed frame 149. The metal fittings of this embodiment are the same as those shown in FIG.

As described above, the driving device itself can be generalized by arranging the couplings according to a wide variety of medical beds. Industrial applicability

In the reclining drive device of the present invention, the engaging portion of the output shaft or the transmission shaft is connected to the crank connecting portion of the reclining operation shaft from which the handle is removed, and the engaging groove of the casing is engaged with the mounted portion. It is designed to be attached to the medical bed together with the casing. Therefore, the reclining drive device can be easily attached to the manual reclining mechanism, and the existing manual medical bed having the manual reclining mechanism can be easily converted into an electric medical bed. useful for

Furthermore, by converting a manual medical bed into a motorized medical bed with a reclining drive, nurses or caregivers are relieved of the heavy lifting of reclining.

2 In addition, the present invention provides a reclining angle detection shaft that rotates at a reduced speed with respect to the output shaft, detects the rotation angle of a cam pivotally attached to this detection shaft by a limit switch, and performs linear motion in which the reclining operation shaft is driven. Since the forward limit and the backward limit of the rod are detected in advance and the rotation of the output shaft is stopped, the device itself is not overloaded and the mechanical life can be extended. In addition, by changing the phase of each cam, the stop position of the electric motor can be easily determined according to various medical beds. Furthermore, it does not require an expensive motor such as a support motor.

Claims

Statement under Article 19 (1) of the Convention

Claim (1) clarifies that the casing of the speed reducer with a motor is attached using a port attached to a suspension metal fitting that is spaced and vertically installed from the bed frame. In other words, the reclining operation shaft and output shaft of the casing are aligned with each other, and the casing is attached to the bed frame. Clarified to form a junction. In the cited example JP 60-1696, the driving device A is placed on the floor and does not show the technique of attaching the driving device A to the bed.

In the cited example JP 60—: 15547, the case 22 is installed on the moving base 25 and does not show the technique of attaching the case 22 to the bed. In JP 6-38961 of the cited example, the electric motor 12 is suspended from the bed by metal 92, and the reclining operation shaft and the output shaft are aligned with each other and the casing is installed. It does not show the technology to attach it to the bed frame and the support metal fittings that form the engagement part at the tip. In the present invention, a pair of supporting metals are protrudingly provided on the casing for mounting the casing on the bed frame by aligning the axes of the reclining operation shaft and the output shaft, and inserting the respective ports at the tips of the supporting metals. The reclining drive device can be easily attached to the manual reclining mechanism by forming the engaging portion to be reclining.