CN1098675C - Reclining drive device for medical bed - Google Patents

Abstract

The present invention relates to an inclined driving device (50) which comprises an output shaft (58) driven by an electric motor (52) in a shell (51), a driving shaft (54), etc., wherein the driving shaft (54) forms a shape combined with both an inclined operation shaft (27) and the output shaft (58), and a pair of combined grooves (64) which are combined with screw bolts (63) used for installing a cylinder are arranged on the shell (51). The combined grooves (64) and the screw bolts (63) used for installing the cylinder are combined, a convex sheet (62) of the driving shaft (54) is inserted into a groove (31) of the inclined opration shaft (27), and thus, the driving device (50) is arranged on a medical bed.

Description

Tilt drives for medical beds

Technical field:

The invention relates to a tilting drive device, which is used to transform a manual medical bed with a manual tilting mechanism into an electric medical bed.

technical background:

Conventionally, there is a manual medical bed in which a manual recliner mechanism 21 is provided on a medical bed 20 (see FIG. 17 ).

This manual tilting mechanism 21 is composed of a cylinder 23 and a folding rod 26. The cylinder 23 converts the manual rotary motion of the crank handle 22 into a linear motion, and the direct linkage between the folding rod 26 and the cylinder 23 The rod 24 connects and makes a part of the medical bed body 25 tiltable.

And, the connecting mechanism that the crank handle 22 is connected with the tilting operation shaft 27 of the tilting mechanism 21 has two types shown in Fig. 18 and Fig. 19 .

In the connection mechanism 30 shown in FIG. 18 , the groove 31 and the protrusion 32 are combined with each other, and the connection state is maintained by the through pin 33 . The crank handle 22 can be unloaded from the tilting operation shaft 27 by pulling out the through pin 33 .

The connecting mechanism 40 shown in FIG. 19 maintains the connected state by engaging the driving pin 41 and the driving groove 42 on the tilt operation shaft 27 with each other and being pulled by a spring 43 . In order to avoid danger, when the crank handle 22 (referring to Fig. 20) is not used, the crank handle 22 is guided by the hinge pin 44 and the elongated hole 45 and overcomes the effect of the spring 43 to be disengaged from the tilting operation shaft 27 by traction, so that , crank handle 22 just can not stretch out the outside of medical bed 20. Furthermore, the crank handle 22 can be detached from the tilt operation shaft 27 by pulling out the hinge pin 44 .

But the manual medical bed 20 that has this crank handle 22 must turn the crank handle 22 to carry out tilting operation by hand, is quite heavy physical labor, when the hospital is provided with a lot of medical beds, the nurse is forced to frequently Engage in labor other than medical work. And, the same question applies to family caregivers.

In order to be liberated from this heavy physical labor, there has been an electric medical bed with an electric transmission device, but because this electric medical bed is too expensive, the existing manual medical bed with a manual tilting mechanism has been replaced. There are also economic problems in disposing of the bed 20 and purchasing a new one.

The purpose of the present invention is to provide a tilting drive device, which can be used on a manual medical bed with a manual tilting mechanism and transformed into an electric medical bed, so as to save nurses or caregivers from heavy physical labor tilting operations. liberated from.

Another object of the present invention is to provide a tilting drive device that does not overload the device itself, and can stop the folding lever at a specified position.

Disclosure of Invention:

The invention provides a tilting driving device for a medical bed. The tilting driving device for a medical bed has a housing with a reduction mechanism of a motor. Combining or disengaging, and the crank handle can be installed and disassembled on the tilting operation shaft; a support is set on the above-mentioned housing, so that the axes of the aforementioned tilting operation shaft and the aforementioned output shaft are consistent and the housing is installed on the shaft by the support. on the bed frame. Both ends of the transmission shaft can be coupled to or disengaged from the output shaft, respectively, and can be coupled to or disengaged from the tilt operation shaft except the crank handle.

Remove the crank handle from the tilt operation shaft, combine the connecting part formed on the transmission shaft with the crank connection part connected to the crank handle, and combine the support part of the housing with the bed frame of the medical bed, thereby The tilting drive device is installed on the medical bed together with the housing.

When the motor is started, the tilt operation shaft is rotated by the output shaft and the transmission shaft, and a part of the manual medical bed is folded.

In this way, the crank handle is removed from the existing manual medical bed, and then the tilting drive device is assembled, so that the manual medical bed is transformed into an electric medical bed, and nurses or caregivers are liberated from heavy physical labor tilting operations.

Moreover, the tilt driving device for a medical bed provided by the present invention has: a tilt detection shaft that decelerates the aforementioned output shaft and rotates; a pair of cams for tilt detection that can change phases are arranged on the detection shaft; Limit switch to stop rotation.

Generally, the overcurrent protection device of the motor measures the forward limit and the backward limit of the direct linkage rod that tilts the bed, and turns off the motor. However, in this case, an unreasonable force is applied to the driving device itself, and the mechanical life of the entire device is significantly reduced.

The present invention is provided with an inclination detection shaft that decelerates the output shaft to rotate, and a limit switch detects a cam pivoted on the detection shaft, thereby stopping the rotation of the output shaft. The deceleration from the output shaft to the detection shaft is performed at a reduction ratio larger than the maximum number of revolutions of the tilt operation shaft.

In addition, although there are various types of medical beds, since the phase of each cam with respect to the detection axis can be changed, each cam can be adjusted to correspond to the forward limit and reverse limit of the direct link.

A brief description of the attached drawings:

Fig. 1 is a front view of a tilt driving device according to an embodiment of the present invention, showing a partial section thereof.

Fig. 2 is a right side view of Fig. 1 .

Fig. 3 is a top view of the tilt driving device shown in Fig. 1 .

Figure 4 is a simplified diagram of the left view of Figure 1.

Fig. 5 is a front view of a tilt driving device according to another embodiment of the present invention, showing a partial section thereof.

FIG. 6 is a right side view of FIG. 5 .

FIG. 7 is a front view of the tilting drive device shown in FIG. 5 , with the casing partially cut away.

Fig. 8 is a schematic sectional view of arrow 8-8 in Fig. 7 .

Fig. 9 is a front view of a tilt driving device according to yet another embodiment of the present invention, showing a partial section thereof.

FIG. 10 is an internal sectional view of the driving device of FIG. 9 .

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

Fig. 12 is a support member showing the connector of Fig. 9, (a) is a front view, and (b) is a side view.

Fig. 13 is a front view of a tilt driving device according to yet another embodiment of the present invention, showing a partial section thereof.

Fig. 14 is a support member showing 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 tilt driving device according to yet another embodiment of the present invention, showing a partial section thereof.

Fig. 16 is a support member showing 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 the medical bed.

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

Fig. 19 is a front view of other connecting mechanisms of the crank handle.

Fig. 20 is a front view showing the crank handle in Fig. 11 in a non-use state.

The best form of implementing the present invention:

1 to 4 show a tilting drive device 50 installed on a manual medical bed 20 with a connecting mechanism 30 shown in FIG. 18 .

The tilt driving device 50 includes a housing 51 , an electric motor 52 , a reduction mechanism 53 , a transmission shaft 54 and the like.

The electric motor 52 is mounted on the housing 51 . A worm 56 is attached to the rotating shaft 55 of the electric motor 52 . The worm 56 meshes with a worm wheel 57 . The worm 56 and the worm wheel 57 constitute the reduction mechanism 53 .

The output shaft 58 of the worm wheel 57 is pivotally supported on a worm gear case 59 . The worm gear case 59 is mounted on the casing 51 through the mounting legs 60 , 60 integral with the worm gear case 59 .

The transmission shaft 54 is installed on the top of the rotating shaft 58 of the worm wheel 57 through a positioning pin 61 . A protruding piece 62 (joint portion) is formed at the tip end of the propeller shaft 54 . The structure of the protruding piece 62 is a structure combined with the groove (crank connecting portion) 30 on the operating shaft 27 of the tilt drive device of the medical bed 20 shown in FIG. 18 .

A pair of coupling grooves 64 are formed in the case 51, and the coupling grooves are coupled with bolts (attached portions) 63, 63 for mounting the two cylindrical bodies. The cylinder mounting bolts 63 are bolts for mounting the bracket 65 mounted on the cylinder 23 to the suspension 66 mounted on the medical bed 20 .

A control circuit 67 is provided in the housing 51 . The control circuit 67 rotates the electric motor 52 forward and backward by operating a manual push button switch (not shown). In addition, the control circuit 67 also has an overload protection function for the electric motor 52 .

Next, a method of using the tilt drive device 50 will be described.

First, pull out the penetration pin 33 of the manual medical bed 20 shown in FIG. 18 , and remove the crank handle 22 from the tilt operation shaft 27 . Then, the coupling groove 64 of the casing 51 of the tilt driving device 50 is coupled to the bolt 63 for mounting the cylindrical body. Simultaneously insert the tab 62 of the transmission shaft 54 into the slot 31 of the tilting device operating shaft 27 . If the relative positions of the tabs 62 and the slots 31 are misaligned, manually rotate the tabs 62 to align their positions. Then, the fixing bolts 68 are screwed into the casing 51, and the outer circumference of the bracket 65 is pressed against the tips of the fixing bolts 68. As shown in FIG. In this way, the tilt drive device 50 is installed on the medical bed 20 .

Then, the manual push button switch is operated to start the electric motor 52 . The rotational force of the electric motor 52 is transmitted to the tilt operation shaft 27 through the worm 56 , the worm wheel 57 , the output shaft 58 , the positioning pin 61 , the transmission shaft 54 , the tab 62 and the groove 31 of the tilt operation shaft 27 . Thereby, a part of the medical bed main body 25 (see FIG. 17 ) is folded. In this way, by installing the tilting drive device 50 to replace the crank handle 22, the manual medical bed is transformed into an electric medical bed.

Figures 5 to 8 show the tilting drive device 70 installed on the manual medical bed 20, and the manual medical bed 20 has the connection mechanism 40 shown in Figure 19 .

This reclining device 70 also includes a housing 71, an electric motor 72, a reduction mechanism 73, a third spur gear (output shaft) 74, and the like. The electric motor 72 is mounted on the housing 71 . A worm 76 is attached to the rotating shaft 75 of the electric motor 72 . The worm 76 meshes with a worm wheel 77 . The rotary shaft 78 of the worm wheel 77 is pivotally supported on a worm gear case 79 . A worm gear case 79 is installed on the housing 71 . The top end of the rotary shaft 78 is fixed to the first spur gear 80 by a well-known coupling device 92 . The first spur gear 80 is supported by the rotating shaft 78 of the worm wheel 77 and the housing 71 .

The first spur gear 80 meshes with the second spur gear 81 . The second spur gear 81 is rotatably provided on the support shaft 82 via a bearing 83 . Both ends of the support shaft 82 are supported by the housing 71 . The second spur gear 81 meshes with the third spur gear 74 . One side of the third spur gear 74 is freely rotatably provided on a holding member 84 provided on the housing 71 . The third spur gear 74 is formed with a hole 85 through which the tilt operation shaft 27 passes, and a pin receiving groove (coupling portion) 86 coupled with the drive pin (crank connection portion) 41 on the tilt operation shaft 27 is formed. The entrance of the pin receiving groove 86 is formed in a wide shape so as to receive the driving pin 41 .

Engagement grooves 88 , 88 for engaging with a bracket (attached portion) 89 are formed in the housing 71 . The bracket 89 is attached to the cylinder body 23 and is installed on the hanger 90 via the cylinder body attachment bolt 87 . The suspension 90 is installed on the medical bed 20 .

Next, a method of using the tilt drive device 70 will be described.

First, the hinge pin 44 of the manual medical bed 20 shown in FIG. 19 is pulled out, and the crank handle 22 is removed from the tilt operation shaft 27 . Then, the coupling groove 88 of the casing 71 of the tilt driving device 70 is coupled with the bracket 89 . Simultaneously, the tilt operation shaft 27 is inserted into the hole 85 of the third spur gear 74 , and the tip of the tilt operation shaft 27 is supported by the case 71 . At this time, the drive pin 41 on the tilt operation shaft 27 enters the pin receiving groove 86 of the third spur gear 74 . If the relative position of the driving pin 41 and the pin receiving groove 86 deviates, the positions of the driving pin 41 and the pin receiving groove 86 are aligned by manually rotating the third spur gear 74 . Then, the fixing bolts 91 are screwed into the casing 71, and the outer circumference of the bracket 89 is pressed against the tips of the fixing bolts 91. In this way, the tilt driving device 70 is installed on the medical bed 20 .

Then, a manual push button switch (not shown) is operated to start the electric motor 72 . The rotational force of the electric motor 72 is transmitted to the tilt operation shaft 27 through the worm 76 , the worm wheel 77 , the first, second, and third spur gears 80 , 81 , and 74 , the pin receiving groove 86 , and the drive pin 41 . Thereby, a part of the medical bed main body 25 (see FIG. 9 ) is folded. In this way, by installing the tilting drive device 70 to replace the crank handle 22, the manual medical bed is transformed into an electric medical bed.

When the tilting operation shaft 27 is positioned at the inside of the medical bed 20, use the tilting drive device 50 shown in FIGS. 1 to 4; The tilt drive device 70. Therefore, the slope shown in Figures 5 to 8

The first to third spur gears 80 , 81 , and 74 of the driving device 70 are arranged in the width direction of the medical bed 20 , and are formed in a flat shape so as not to protrude outside the medical bed 20 .

Figures 9 to 12 show other embodiments. The tilt drive device 100 of this embodiment has a device protection mechanism. When the inclination angle reaches the maximum and the inclination angle reaches the minimum, the protection mechanism stops the electric motor 102 . That is, when the direct link reaches the forward limit and the backward limit, the electric motor 102 is stopped.

The protection mechanism has: a tilt angle detection shaft 104 arranged in the housing 103, a pair of cams 105, 106 mounted on the detection shaft 104, and limit switches 107, 108 activated by the cams 105, 106, respectively.

The tilt angle detection shaft 104 rotates in conjunction with the output shaft 110 via two gears 109 . The reduction ratio is very important. Typically, the output shaft 110 rotates by about 40-50. When using the limit switches 107 and 108, it is necessary to make the rotation angle of the detection shaft 104 not exceed 360°. Therefore, the reduction ratio is set to 70 in this embodiment. In order to obtain a certain reduction ratio, it is of course possible to use a worm or a planetary gear train.

The pair of cams 105 and 106 stops the electric motor 102 and the output shaft 110 by actuating the limit switches 107 and 108 . One cam 105 is used to detect the forward limit of the direct linkage, and the other cam 106 is used to detect the backward limit of the direct linkage. The phases of the cams 105 and 106 can be changed respectively with respect to the inclination angle detection shaft 104 . For example, when the direct linkage rod is at the advance limit, the cam 105 adjusts the phase, and the limit switch 107 is activated, and at this position, the screw threaded with the cam 105 is pressed against the surface of the detection shaft 104, thereby the cam 105 is fixed at the specified position. position.

When the limit switches 107 and 108 actuated by the cams 105 and 106 detect that the tilt operation shaft 101 cannot be rotated beyond this limit, the electric motor 102 is stopped. The device and thus the hospital bed can thus be protected.

In the present embodiment, the stop of the electric motor 102 is adjusted by changing the phase of the cams 105 and 106, but the following configurations are also possible. That is: the cam can also be fixed on the detection shaft 104 to change the position of the limit switch. For example, the bottom of the housing 103 is made into an arc shape, and a slider that can move concentrically with the detection shaft 104 is provided along the bottom, and the slider is fixed at a predetermined position by screws. Install limit switches on this slide. By adjusting the positions of the sliding member and the limit switch, the forward limit and the backward limit of the direct linkage rod can be detected.

The embodiment of Figures 9 to 12 incorporates an improved structure of the connector. The connector 111 is used to connect the standardized and unified driving device to various medical beds. The connecting part 111 has a supporting part 112 for fixing the driving device 100 on the medical bed, and has a transmission shaft 113 for connecting the output shaft 110 of the driving device 100 to the tilting operation shaft 101 .

The connecting part 111 of this embodiment has a supporting part 112 for fixing the driving device 100 on the bed frame 114 and a joint part 113 for connecting the output shaft 110 to the tilting operation shaft 101 with a hexagonal hole.

The supporting member 112 is fastened on the casing 103 of the driving device 100 . Then, the support member 112 is suspended on the bed frame 114, and the bolt 115 screwed together below is compressed on the bed frame 114, so that the driving device 100 is installed on the bed frame 114.

Moreover, the support member and the casing shown in FIGS. 1 to 8 are of an integral structure, but as in this embodiment, by making the support member 112 and the casing separate components, standardization and unification of the driving device can be realized.

The joint part 113 is inserted into the notched circular output shaft 110 of the driving device 110 and fixed by screws. The hexagonal tip of the joint member 113 is inserted into the tilt operation shaft 101 having a hexagonal hole.

Figure 13 and Figure 14 show other embodiments of the connector. The supporting member 121 of the connecting member 120 of this embodiment uses the cylinder installation bolt 122 to fix the driving device 123 on the medical bed 124 . The supporting member 121 is fastened on the casing 125 of the driving device 123 . Then, a pair of cantilever rods 126 are inserted between the suspension part 127 and the housing 128, the cylinder mounting bolts 122 are inserted into the coupling groove 129 and screwed into the bolts 122, and the bolts 131 threaded with the tongue piece 130 are pressed tightly. On the cylinder 128, the drive unit 123 is thus mounted on the bed frame 132.

The joint of this embodiment transmits the rotational force from the output shaft 134 to the tilt operation shaft 135 using the drive pin 133 . One end of the joint piece 136 is inserted into the notch circular output shaft 134 of the driving device 123 and fixed with screws. And the other end of the joint member 136 is inserted into the tilt operation shaft 135 . At this time, the driving pin 133 is inserted into the pin receiving groove 137 formed at the tip of the joint member 136 .

Figures 15 and 16 show yet another embodiment of the connector. The supporting member 141 of the connecting member 140 in this embodiment is to fix the driving device 143 on the medical bed 144 by using the cylinder mounting bolts 142 . The supporting member 141 is fastened on the casing 145 of the driving device 143 . Then, a pair of cantilever rods 146 are inserted between the suspension parts 147 and the cylinder body 148, the cylinder installation bolts 142 are inserted into the suspension parts 147 and the cantilever rods 146 and the bolts 142 are tightened, so that the drive unit 143 is installed on the On the bed frame 149. In addition, the joint member of this embodiment is the same as that shown in FIG. 14 .

As described above, since the connectors suitable for various medical beds are prepared, the drive device can be used in common.

Industrial Utilization Possibility

Connect the connecting part of the output shaft or transmission shaft to the crank connecting part of the tilting operation shaft that removes the handle, and combine the combining groove of the housing with the installed part, so that the tilting drive device of the present invention is installed together with the housing On a medical bed. Therefore, the tilting drive device can be simply installed on the manual tilting mechanism, and it is beneficial to easily transform the existing manual medical bed with the manual tilting mechanism into an electric medical bed.

Moreover, since the manual medical bed is transformed into an electric medical bed by using the tilting drive device, nurses or caregivers are liberated from the tilting operation of heavy physical labor.

In addition, since the present invention is provided with a tilt angle detection shaft for decelerated rotation of the output shaft, and the limit switch is used to detect the rotation angle of the cam pivoted on the detection shaft, the direct linkage lever driven by the tilt operation shaft is measured in advance. The forward limit and backward limit of the output shaft are stopped, so that the device itself will not be overloaded, and the mechanical life can be extended. Furthermore, by changing the phase of each cam, the stop position of the motor can be easily set corresponding to various medical beds. In addition, there is no need to use expensive motors such as servo motors.

Claims (3)

1. A tilting drive device for a medical bed, the tilting drive device for a medical bed is provided with a housing with a reduction mechanism of a motor, the output shaft of the motor is connected to one end of the tilting operation shaft, and the aforementioned The housing, the pair of bolts are spaced apart from the bed frame and placed between the suspension parts in a drooping state and are opposite to the tilting operation shaft, and the tilting operation shaft can be combined with or disengaged from the crank handle. In the tilt driving device, it is characterized in that a pair of protruding supports are provided on the above-mentioned housing, so that the axis centers of the above-mentioned tilt operation shaft and the above-mentioned output shaft are consistent, and the aforementioned housing is installed on the bed frame by the support On the top end of the supporting member, a coupling portion into which the respective bolts are inserted is formed. 2. The tilt driving device for a medical bed as claimed in claim 1, wherein a transmission shaft is arranged between the above-mentioned tilt operation shaft and the above-mentioned output shaft, and the two ends of the transmission shaft are respectively formed in a shape capable of being combined with or disengaged from the above-mentioned output shaft and A shape that engages or disengages from the tilt operation shaft after removing the crank handle. 3. The tilt driving device for a medical bed as claimed in claim 1, comprising: a tilt angle detection shaft that decelerates the output shaft and rotates, a pair of cams for tilt angle detection that can change phases on the detection shaft, A limit switch that stops the rotation of the above-mentioned output shaft by actuation.

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