Clutch mechanism of lifting screw of nursing bed

Abstract

The utility model belongs to the technical field of nursing beds, and particularly provides a clutch mechanism of a lifting screw of a nursing bed, which comprises a screw, a guide pipe, a gasket, two limit rings and a nut, the guide pipe is sleeved outside the nut, the nut can rotate in the guide pipe, and the two limit rings are fixedly mounted at two ends of an inner cavity of the guide pipe respectively. The two gaskets are coaxially assembled at the two ends of the screw respectively; two inclined blocks are axially assembled on the outer side wall of the nut, a spring is assembled between the two inclined blocks, and sinking tables are coaxially and annularly arranged on the two end faces of the nut. According to the lifting screw engaging and disengaging mechanism of the nursing bed, the gasket, the inclined block, the limiting ring and the limiting groove are matched, and the purpose of rotating engaging and disengaging of the screw and the catheter is achieved; the clutch mechanism is small in occupied space and good in stability, the screw cannot be blocked in the rotating process, and therefore it is guaranteed that the bed board can ascend to the highest point or descend to the lowest point; the clutch mechanism is simple in structure, production and machining difficulty of parts is low, and popularization and mass production are facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of nursing beds, and in particular provides a clutch mechanism for a lifting screw of a nursing bed. Background Art

[0002] Reference Figure 7 The clutch mechanism of the existing nursing bed's lifting screw features a groove machined into the lifting nut. A clutch block passes through a square hole in the lifting guide, making contact with the outer cylindrical surface of the lifting nut and the groove. A spring-loaded semicircular latch then applies a clutch force to the clutch block. When the lifting nut reaches its lowest and highest positions on the lifting screw, a spring pin fixed to the lifting screw engages with the bosses at both ends of the lifting nut, achieving clutch engagement.

[0003] This solution has unstable clutch force, and due to the uncertainty of the thread entry point on the lifting screw, the position of the spring pin relative to the thread is random, which will cause uncertainty in the relative position of the spring pin and the bosses at both ends of the lifting nut. There is a possibility that the spring pin is stuck on the end faces of the bosses at both ends of the lifting nut, resulting in the lifting screw and the lifting nut cannot be effectively clutched, and there is a risk that the nursing bed cannot operate to the lowest and highest positions. Utility Model Content

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a clutch mechanism of a lifting screw of a nursing bed, comprising a screw, a catheter, a gasket, a limiting ring and a nut, wherein the catheter is sleeved on the outside of the nut, and the nut can rotate inside the catheter, two limiting rings are respectively fixedly installed at both ends of the inner cavity of the catheter, and two gaskets are respectively coaxially assembled at both ends of the screw;

[0005] Two inclined blocks are axially mounted on the outer wall of the nut, a spring is mounted between the two inclined blocks, and a coaxial ring-shaped sink is provided on both end faces of the nut;

[0006] The end surface of the limiting ring adjacent to the nut is provided with a plurality of limiting grooves symmetrically arranged in the center, and the inclined blocks can be snapped into the limiting grooves;

[0007] The gasket can pass through the gap between the limiting ring and the screw and be embedded in the sinking platform.

[0008] Furthermore, the lifting screw clutch mechanism of the nursing bed also includes a connecting piece, which is fixedly connected to the outer wall of the catheter.

[0009] Furthermore, a straight groove is axially provided on the outer side wall of the nut, and the inclined block and the spring are both assembled in the straight groove.

[0010] Furthermore, the inclined blocks are provided with inclined surfaces, and the inclined surfaces of the two inclined blocks are arranged facing each other.

[0011] Further, outer walls of the two limiting rings are provided with external threads, and both ends of an inner wall of the guide pipe are provided with internal threads, and the two limiting rings are screwed to the guide pipe.

[0012] The beneficial effects of the utility model are as follows:

[0013] The lifting screw clutch mechanism of the nursing bed adopts a gasket, an inclined block, a limiting ring and a limiting groove to realize the rotation clutching of the screw and the guide pipe.

[0014] The clutch mechanism occupies a small space and has good stability, and the screw cannot be stuck during rotation, so as to ensure that the bed plate can effectively reach the highest point or drop to the lowest point.

[0015] The clutch mechanism has a simple structure, low production and processing difficulty of parts, and is beneficial to popularization and mass production. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic view of the utility model;

[0017] Figure 2 It is a top view of the utility model;

[0018] Figure 3 It is Figure 2 It is a sectional view of A-A;

[0019] Figure 4 It is a structural schematic view of the limiting ring and the nut of the utility model;

[0020] Figure 5 It is a sectional view of the guide pipe and the limiting ring of the utility model;

[0021] Figure 6 It is a sectional view of the nut of the utility model;

[0022] Figure 7 It is a structural schematic view of the prior art;

[0023] The reference signs include:

[0024] 1, screw; 2, guide pipe; 3, connecting piece; 4, gasket;

[0025] 5, limiting ring;

[0026] 501, limiting groove;

[0027] 6, nut;

[0028] 601, straight groove; 602, inclined block; 603, spring; 604, sunken table. DETAILED DESCRIPTION

[0029] The utility model will be described in detail below in combination with the drawings.

[0030] Example 1

[0031] Reference Figures 1-6 A clutch mechanism for a lifting screw of a nursing bed includes a screw 1, a catheter 2, a gasket 4, a limiting ring 5 and a nut 6. The catheter 2 is sleeved on the outside of the nut 6, and the nut 6 can rotate inside the catheter 2. Two limiting rings 5 ​​are respectively fixedly installed at both ends of the inner cavity of the catheter 2 to limit the nut 6 inside the catheter 2. Two gaskets 4 are respectively coaxially assembled at both ends of the screw 1;

[0032] Two inclined blocks 602 are axially mounted on the outer wall of the nut 6, a spring 603 is mounted between the two inclined blocks 602, and a coaxial ring-shaped sink 604 is formed on both end surfaces of the nut 6;

[0033] A plurality of limiting grooves 501 are centrally and symmetrically formed on the end surface of the limiting ring 5 adjacent to the nut 6, and the inclined blocks 602 can be snapped into the limiting grooves 501;

[0034] When the nut 6 moves to the end of the screw 1, the gasket 4 can pass through the gap between the limiting ring 5 and the screw 1 and embed into the sink 604. During this displacement process, the gasket 4 presses against the end face of the inclined block 602 and gradually pushes it out of the limiting groove 501.

[0035] The lifting screw clutch mechanism of the nursing bed also includes a connecting piece 3, which is fixedly connected to the outer wall of the conduit 2 for docking with the nursing bed.

[0036] Preferably, a gap is left between the assembly position of the gasket 4 and the end face of the screw 1 to ensure that the gasket 4 can be completely embedded in the sink 604 and drive the inclined block 602 to be completely disengaged from the limiting groove 501.

[0037] Preferably, a straight groove 601 is axially opened on the outer side wall of the nut 6 , and the inclined block 602 and the spring 603 are both assembled in the straight groove 601 .

[0038] Specifically, the main body of the inclined block 602 is a rectangular parallelepiped, and an inclined surface is formed on the rectangular parallelepiped by chamfering. The inclined surface is located on the side away from the spring 603 and is arranged along the radial direction of the screw 1;

[0039] The inclined surfaces of the two inclined blocks 602 are arranged to face each other, that is, the inclined surface of one inclined block faces clockwise, while the inclined surface of the other inclined block faces counterclockwise.

[0040] Preferably, the two limiting rings 5 ​​are assembled in the conduit 2 by screwing or welding;

[0041] When the threaded assembly method is adopted, the two limiting rings 5 ​​are both threaded into the conduit 2, and a wrench groove is provided on the end surface of the limiting ring 5.

[0042] Example 2

[0043] Compared with the first embodiment, the difference of this embodiment is:

[0044] Specifically, the outer diameter of the gasket 4 is a, the inner diameter of the conduit 2 is b, the inner diameter of the limiting ring 5 is c, the outer diameter of the nut 6 is d, the inner diameter of the sink 604 is f, and the distance between the inclined block 602 and the central axis of the screw 1 is e;

[0045] a<c, d≥c, b>d, e<f / 2.

[0046] Example 3

[0047] Compared with the first or second embodiment, the present embodiment is different in that:

[0048] Specifically, the forward rotation direction of the screw 1 is preset to be clockwise. When the screw 1 rotates forward, the nut 6 moves from front to back. Then, the inclined surface of the front inclined block should face the clockwise direction, and the inclined surface of the rear inclined block should face the counterclockwise direction.

[0049] The screw 1 is rotated clockwise. When the screw 1 rotates forward, the nut 6 moves from the back to the front. The inclined surface of the front inclined block should face the counterclockwise direction, while the inclined surface of the rear inclined block should face the clockwise direction.

[0050] The screw 1 is rotated in a counterclockwise direction. When the screw 1 rotates in a forward direction, the nut 6 moves from front to back. The inclined surface of the front inclined block should face the counterclockwise direction, while the inclined surface of the rear inclined block should face the clockwise direction.

[0051] The forward rotation direction of the screw rod 1 is preset to be counterclockwise. When the screw rod 1 rotates forward, the nut 6 moves from back to front. The inclined surface of the front inclined block should face the clockwise direction, while the inclined surface of the rear inclined block should face the counterclockwise direction.

[0052] The above content is only a preferred embodiment of the present invention. For ordinary technicians in this field, many changes can be made in the specific implementation methods and application scope based on the concept of the present invention. As long as these changes do not deviate from the concept of the present invention, they all fall within the scope of protection of the present invention.

Claims

1. A clutch mechanism for a nursing bed lifting screw, characterized by: It includes a screw, a catheter, a gasket, a limiting ring and a nut. The catheter is sleeved on the outside of the nut, and the nut can rotate in the catheter. Two limiting rings are fixedly installed at both ends of the catheter cavity, and two gaskets are coaxially assembled at both ends of the screw. Two inclined blocks are axially mounted on the outer wall of the nut, a spring is mounted between the two inclined blocks, and a coaxial ring-shaped sink is provided on both end faces of the nut; The end surface of the limiting ring adjacent to the nut is provided with a plurality of limiting grooves symmetrically arranged in the center, and the inclined blocks can be snapped into the limiting grooves; The gasket can pass through the gap between the limiting ring and the screw and be embedded in the sinking platform.

2. The clutch mechanism of the nursing bed lifting screw according to claim 1, characterized in that: It also includes a connecting piece, which is fixedly connected to the outer side wall of the catheter.

3. The clutch mechanism of the nursing bed lifting screw according to claim 1, characterized in that: A straight groove is axially provided on the outer side wall of the nut, and the inclined block and the spring are both assembled in the straight groove.

4. The clutch mechanism of the nursing bed lifting screw according to claim 1, characterized in that: The inclined blocks are provided with inclined surfaces, and the inclined surfaces of the two inclined blocks are arranged facing each other.

5. The clutch mechanism of the nursing bed lifting screw according to claim 1, characterized in that: External threads are provided on the outer walls of the two limiting rings, and internal threads are provided at both ends of the inner wall of the conduit. Both the limiting rings are screwed into the conduit.

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