Power mechanism for patient transfer bed

Abstract

The power mechanism for a patient transfer bed is characterized by comprising a movable beam, a gearbox with a motor fixed on the movable beam, a transmission shaft connected to the power output end of the gearbox, a gearbox with gears fixed to both ends of the movable beam, and racks arranged at both ends of the bed frame. The gears are rotatably connected in the gearbox, the transmission shaft drives the gears in the gearbox to rotate, the gears in the gearbox driven by both ends of the transmission shaft are respectively meshed with the racks at both ends of the bed frame, the movable bed with a transmission belt is fixedly connected to at least one of the movable beam and the gearbox, and the transmission gear on the clutch arranged on the roller that drives the transmission belt to move is meshed with the gear on the gearbox. Compared with the prior art, the present invention has the advantages of simple structure, low manufacturing cost, and convenient disassembly and assembly.

Description

Technical Field

[0001] The present invention relates to a medical device. Background Art

[0002] As disclosed in patent application CN201911062014.5, the power mechanism of the mobile bed for transporting medical patient transfer beds includes a motor arranged on the bed frame, a screw rod arranged on the bed frame driven by the motor through a transmission mechanism (a transmission wheel / transmission belt transmission mechanism or a sprocket / chain transmission mechanism) and a nut screwed on the screw rod, and the nut is connected to the mobile bed frame. Although the transmission precision is high by using a screw rod and a nut, the cost is also correspondingly high, and it is inconvenient to disassemble and assemble. Moreover, the movement of the mobile bed does not require high transmission precision. In addition, the power mechanism and other transmission mechanisms of the mobile bed (such as the transmission mechanism that moves the belt on the mobile bed) are independent and have no connection with each other. The independent arrangement of multiple power transmission mechanisms also leads to the complex structure and high cost of this product. Summary of the invention

[0003] The object of the present invention is to provide a power mechanism for a patient transfer bed which has low manufacturing cost, is easy to assemble and disassemble, and operates smoothly.

[0004] The present invention is implemented as follows: it includes a movable beam, a gearbox with a motor fixed on the movable beam, a transmission shaft connected to the power output end of the gearbox, a gearbox with gears fixed to both ends of the movable beam, and racks arranged at both ends of the bed frame. The gears are rotatably connected in the gearbox, and the transmission shaft drives the gears in the gearbox to rotate. The gears in the gearbox driven by both ends of the transmission shaft are respectively meshed with the racks at both ends of the bed frame. A frame formed by connecting the movable beam, the gearbox and the gearbox is fixedly connected to the movable bed with a transmission belt, and the transmission gear on the clutch arranged on the roller that drives the transmission belt to move is meshed with the gear on the gearbox.

[0005] When in use, the motor drives the transmission shaft to rotate through the gearbox, and the transmission shaft drives the gears in the gearboxes on both sides to rotate synchronously. The rotating gears roll forward and backward along the rack, and the movable bed fixedly connected to it is driven to move forward and backward through the gearbox, movable beam and gearbox connected to form a frame. During the movement of the movable bed, the gear drives the roller to rotate through the transmission gear through the clutch, and the roller drives the transmission belt on the movable bed to move, so as to transfer the patient from the movable bed to the sickbed or from the sickbed to the movable bed. The motor power directly drives the gear to rotate, so that the frame connected by the movable beam, the gearbox and the gearbox moves forward and backward along the rack, and there is no need for the transmission mechanism of the screw rod and the nut in the prior art, thereby simplifying the structure, reducing the manufacturing cost, and facilitating disassembly and assembly; the movable beam is used and the two ends of the movable beam are fixedly connected to the gearbox, so that the gravity of the movable bed will not fall on the transmission shaft, avoiding the transmission shaft being affected by the gravity of the movable bed and affecting its transmission, and at the same time, it also reduces the manufacturing cost of the transmission shaft (since it is only transmission, there is no need to have sufficient rigidity to withstand the gravity of the movable bed)

[0006] Compared with the prior art, the present invention has the advantages of simple structure, low manufacturing cost, convenient assembly and disassembly, and smooth operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a structural schematic diagram of the present invention;

[0008] Figure 2 It is a schematic diagram of the structure of the moving bed using the present invention;

[0009] Figure 3 is a schematic diagram of the structure of the gearbox;

[0010] Figure 4 for Figure 1 A partial enlarged view of point A. DETAILED DESCRIPTION

[0011] The present invention is now described in further detail with reference to the accompanying drawings and embodiments:

[0012] like Figure 1 , 2As shown, this embodiment includes a movable beam 1, a gearbox 3 with a motor 2 fixed on the movable beam 1, a transmission shaft 4 connected to the power output end of the gearbox 3, a gearbox 6 with a gear 5 fixed at both ends of the movable beam 1, and a rack 8 arranged at both ends of a bed frame 7. The gear 5 is rotatably connected in the gearbox 6 (the shaft connected to the gear 5 is connected to the bearing on the gearbox 6), the transmission shaft 4 drives the gear 5 in the gearbox 6 to rotate, and the gears 5 in the gearbox 6 driven by both ends of the transmission shaft 4 are respectively placed on the rack 8 at both ends of the bed frame 7 and meshed with them. The frame formed by the movable beam, the gearbox and the gearbox is fixedly connected to the movable bed frame 11 of the movable bed 10 with a transmission belt 9, and the transmission gear 14 on the clutch 13 arranged on the roller 12 that drives the transmission belt 9 to move is meshed with the gear 5 on the gearbox 6.

[0013] Another preferred embodiment is: Figure 3 As shown, the gear box 6 comprises a housing 6a, a narrow gear set 6b rotatably arranged in the housing 6a and composed of a plurality of gears arranged vertically and meshing with each other, a gear 5 located above the narrow gear set 6b and meshing with the uppermost narrow gear, the gear 5 being wider than the narrow gear set 6b and the narrow gear set 6b being located on one side of the gear 5, and a rack 8 passing through the housing 6a and being located on the other side below the gear 5. The narrow gear set 6b composed of a plurality of narrow gears arranged vertically and meshing with each other is adopted to extend the power transmission distance, so that the power arranged below the movable bed 10 can be smoothly transmitted to the transmission gear 14 of the clutch 13 on the side of the movable bed 10 which is relatively high, so as to smoothly drive the transmission belt 9 to move, and at the same time, the center of gravity of the movable bed 10 relative to the rack 8 is lowered, so that the movable bed 10 moves stably. A rollable limiting roller 15 is arranged in the box body 6a below the rack 8, so that the gear box 6 is positioned on the rack 8 and moves smoothly back and forth along the rack 8, thereby preventing the movable bed 10 fixedly connected to the frame composed of the movable beam 1, the gearbox 6 and the gear box 6 from falling off the bed frame 7.

[0014] Another preferred embodiment is: Figure 1 As shown, the movable beams 1 are two tubes fixed on both sides of the gearbox 3 (fixed by flanges at both ends of the tubes), and the transmission shafts 4 at the power output ends on both sides of the gearbox 3 pass through the tubes 1.

[0015] like Figure 1 , 2 As shown, another preferred embodiment is: the movable bed 10 includes a movable bed frame 11, rollers 12 arranged on the front and rear sides of the movable bed frame 11, and a conveyor belt 9 (belt or cloth belt) wound around the rollers 12 on the left and right sides, as shown in FIG. Figure 1 , 4 As shown, a transmission gear 14 constituting a clutch 13 is connected to the end of one of the rollers 12 .

[0016] like Figure 1 , 4 As shown, another preferred embodiment is: the transmission gear 14 constituting the clutch 13 is connected to the end of the roller 12 through a bearing, a non-circular shaft 12a (such as a square shaft) is arranged on the outer side of the end of the roller 12, and the non-circular shaft is slidably connected with a rotating member 16 arranged on it, and the outer side surface of the transmission gear 14 is provided with external teeth 17, and the inner side surface of the rotating member 16 corresponding to the external teeth arranged on the outer side surface of the transmission gear 14 is provided with internal teeth 18, and the outer surface of the rotating member 16 is provided with an annular groove 16a, and a fork 20 with a shift rod 19 is arranged in the groove 16a, and the middle part of the shift rod 19 is hinged on the hinge outside the gear box 6, and the free end of the shift rod 19 is driven by the push rod 21a of the electric push rod 21 arranged on the gearbox 3. The transmission gear 14, the rotating member 16, the fork 20 with the shift rod 19, and the electric push rod 21 constitute the clutch 13.

Claims

1. A power mechanism for a patient transfer bed, characterized in that It includes a movable beam, a gearbox with a motor fixed on the movable beam, a transmission shaft connected to the power output end of the gearbox, a gearbox with gears fixed at both ends of the movable beam, and racks arranged at both ends of the bed frame. The gears are rotatably connected in the gearbox, and the transmission shaft drives the gears in the gearbox to rotate. The shaft connected with the gears is connected to the bearing on the gearbox. The gears in the gearbox driven by both ends of the transmission shaft are respectively meshed with the racks at both ends of the bed frame. The frame formed by the movable beam, the gearbox and the gearbox is fixedly connected to the movable bed with a transmission belt. The transmission gear on the clutch arranged on the roller that drives the transmission belt to move is meshed with the gear on the gearbox. The gearbox includes a box body, a narrow gear group composed of a plurality of narrow gears arranged up and down and meshing with each other, which is rotatably arranged in the box body, and a gear located above the narrow gear group and meshing with the uppermost narrow gear. The gear is wider than the narrow gear group and the narrow gear group is located on one side of the gear. The rack passes through the box body and is located on the other side below the gear. The movable beam is two tubes fixed on both sides of the gearbox, and the transmission shafts at the power output ends of both sides of the gearbox pass through the tubes.

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