CN109009696B

CN109009696B - Adjustable stretcher capable of being lifted by multiple people in medical field

Info

Publication number: CN109009696B
Application number: CN201810764767.XA
Authority: CN
Inventors: 崔从先; 王磊; 李海燕; 李慧峰; 李晋
Original assignee: Affiliated Hospital of University of Qingdao
Current assignee: Affiliated Hospital of University of Qingdao
Priority date: 2018-07-12
Filing date: 2018-07-12
Publication date: 2020-03-20
Anticipated expiration: 2038-07-12
Also published as: CN109009696A

Abstract

The invention belongs to the field of stretchers, and particularly relates to an adjustable stretcher capable of being lifted by multiple persons in the medical field, which comprises a lying plate, a first adjusting mechanism, a second adjusting mechanism, a telescopic rod mechanism and the like, wherein the first adjusting mechanism and the second adjusting mechanism are symmetrically arranged on two sides of the lower surface of the lying plate; one end of the telescopic rod mechanism is connected with the first adjusting mechanism, and the other end of the telescopic rod mechanism is connected with the second adjusting mechanism; when a person lifting the stretcher at one side of the stretcher shakes or slips, the stretcher is prevented from overturning due to the stress of one side; thereby protecting the stretcher from sliding off the stretcher and ensuring the safety of the stretcher; when the four-person lifting stretcher passes through the corner of the stair or the corner of the narrower lane, the positions of the persons at the two sides of the stretcher are staggered relatively, and the transverse size of the stretcher is reduced, so that the stretcher can pass through the corner of the stair or the corner of the narrower lane more easily.

Description

Adjustable stretcher capable of being lifted by multiple people in medical field

Technical Field

The invention belongs to the field of stretchers, and particularly relates to an adjustable stretcher capable of being lifted by multiple people in the medical field.

Background

The conventional stretcher is generally applied as a simple tool for transporting people at present, and the weight of the stretcher and the people on the stretcher is borne only by two arms of two people when the two people are lifted together in tandem; when the stretcher passes through the corner of a stair or the corner of a narrower roadway, the stretcher is lifted by the front person and the rear person, the force on the two arms cannot be fully applied to the stretcher, and the stretcher easily slips from the hands due to instability, so that the safety of people sitting on the stretcher is endangered; in order to ensure safety when passing through the corners of the stairs or the narrow corners of the alleys, one person needs to be added to each of the two sides of the stretcher; the stretcher has the advantages that the space at the corner of the stair or the narrow corner of the tunnel is insufficient for four people to pass through smoothly at the same time, the stability of the stretcher can not be well kept, and the safety of people sitting on the stretcher can not be ensured; when four persons lift the stretcher and walk on a rugged or slippery road, the persons walk to be deep, shallow and shallow, so that the persons on one side of the stretcher may shake or slide, the two sides of the stretcher are stressed unevenly, and the two sides of the stretcher swing up and down; if the stretcher swings badly, people sitting on the stretcher are likely to fall off the stretcher; the stretcher is not safe for the wounded or the patient because of the lack of necessary protection for the body safety of the people sitting on the stretcher.

The invention designs an adjustable stretcher which can be lifted by a plurality of people in the medical field, and solves the problems.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention discloses an adjustable stretcher capable of being lifted by multiple people in the medical field, which is realized by adopting the following technical scheme.

The utility model provides a stretcher with adjustable medical field many people can lift which characterized in that: the multifunctional lying board comprises a lying board, trapezoidal sliding grooves, a first handle, a first adjusting mechanism, a second adjusting mechanism and a telescopic rod mechanism, wherein the two trapezoidal sliding grooves are formed in the lower surface of the lying board along the length direction of the lying board; one ends of the two trapezoidal sliding grooves are positioned on the symmetry axis of the lower surface of the lying plate, and the two trapezoidal sliding grooves are centrosymmetric around the lower surface of the lying plate; each wide end face of the lying plate is symmetrically provided with a group of first handles, and each group is provided with two first handles; the two groups of first handles on the two wide end surfaces are mutually symmetrical; under a normal state, the first adjusting mechanism and the second adjusting mechanism are symmetrically arranged on two sides of the lower surface of the lying plate; one end of the telescopic rod mechanism is connected with the first adjusting mechanism, and the other end of the telescopic rod mechanism is connected with the second adjusting mechanism.

The first adjusting mechanism comprises a trapezoidal sliding block, a connecting round block, a rotating round block, a U-shaped block, a rotating cavity, a connecting hole, a first pin hole, a first L-shaped connecting block, a second pin hole, a first square groove, a second handle, a rectangular hole, a button, a first transmission strip, a second transmission strip, a transmission strip inclined plane, a first pin, a side support lug and a fourth pin hole, wherein the upper end of the U-shaped block is provided with the rotating cavity; the upper end surface of the U-shaped block is provided with a connecting hole which is communicated with the rotating cavity; a first through pin hole is formed between two side surfaces of the U-shaped block; the rotary round block is arranged in the rotary cavity in a rotating fit manner; the connecting round block is arranged in the connecting hole, and the lower end face of the connecting round block is fixedly connected with the upper end face of the rotating round block; the trapezoidal sliding block is arranged on the upper end surface of the connecting round block; a second pin hole is formed in the outer side of the corner of the L-shaped surface of the first L-shaped connecting block; one end face of the first L-shaped connecting block is provided with a first square groove, and the other end face of the first L-shaped connecting block is provided with a second square groove; the first square groove is vertically communicated with the second square groove; the first L-shaped connecting block is arranged in a U-shaped opening of the U-shaped block through a first pin; the first pin sequentially passes through the first pin hole and the second pin hole; a through rectangular hole is formed between the two end surfaces of the second handle; one end of the second handle is arranged on the end face of the first L-shaped connecting block, which is provided with the first square groove, and the orifice of the rectangular hole on the end face of the second handle is butted with the notch of the first square groove on the first L-shaped connecting block; two side support lugs are symmetrically arranged on the end face of the first L-shaped connecting block, which is provided with the second square groove, and the two side support lugs are parallel to the side face of the U-shaped block, which is provided with the first pin hole; the two side lugs are provided with a through fourth pin hole; a button is arranged on one end face of the first transmission strip, and the other end of the first transmission strip penetrates through a rectangular hole in the second handle and is inserted into a first square groove in the first L-shaped connecting block; one end of the second transmission bar is provided with a transmission bar inclined plane; one end of the second transmission strip, which is provided with a transmission strip inclined plane, is inserted into a second square groove on the first L-shaped connecting block; the inclined surface of the transmission strip is in contact fit with one end of the first transmission strip.

The second adjusting mechanism comprises a trapezoidal sliding block, a connecting round block, a rotating round block, a U-shaped block, a rotating cavity, a connecting hole, a first pin hole, a second L-shaped connecting block, a third pin hole, a third handle, a first pin, a side support lug and a fourth pin hole, wherein the upper end of the U-shaped block is provided with the rotating cavity; the upper end surface of the U-shaped block is provided with a connecting hole which is communicated with the rotating cavity; a first through pin hole is formed between two side surfaces of the U-shaped block; the rotary round block is arranged in the rotary cavity in a rotating fit manner; the connecting round block is arranged in the connecting hole, and the lower end face of the connecting round block is fixedly connected with the upper end face of the rotating round block; the trapezoidal sliding block is arranged on the upper end surface of the connecting round block; a third pin hole is formed in the outer side of the corner of the L-shaped surface of the second L-shaped connecting block; the second L-shaped connecting block is arranged in a U-shaped opening of the U-shaped block through a first pin; the first pin sequentially passes through the first pin hole and the third pin hole; one end of the third handle is arranged on one end surface of the second L-shaped connecting block; two side support lugs are symmetrically arranged on the end face, which is not connected with the third handle, of the second L-shaped connecting block, and the two side support lugs are parallel to the side face, which is provided with the first pin hole, of the U-shaped block; and the two side support lugs are provided with through fourth pin holes.

The telescopic rod mechanism comprises a quadrangular telescopic outer sleeve, a limiting groove, a sixth pin hole, a second pin, a reset spring, a quadrangular telescopic inner rod, a third square groove, a positioning groove, a square through hole, a fifth pin hole, a right-angle triangular block, a third transmission strip, a limiting block and a limiting spring, wherein a plurality of limiting grooves are uniformly formed in one side surface of the inner wall of the quadrangular telescopic outer sleeve along the length direction of the quadrangular telescopic outer sleeve; a through sixth pin hole is formed between two opposite side surfaces of one end, which is not provided with the sleeve opening, of the four-edge telescopic outer sleeve; a through fifth pin hole is formed between two opposite side surfaces at one end of the quadrangular telescopic inner rod; a third square groove and a positioning groove are respectively formed in two ends of one side surface, which is not provided with the fifth pin hole, of the four-edge telescopic inner rod; the third square groove is positioned at one end of the four-edge telescopic inner rod, which is provided with a fifth pin hole; a square through hole is formed in the quadrangular telescopic inner rod along the length direction, and two ends of the square through hole are respectively communicated with the third square groove and the positioning groove; the limiting block is provided with a reset inclined plane, a transmission inclined plane and a limiting plane; the limiting block is arranged in the positioning groove in a sliding fit manner; the limiting spring is positioned in the positioning groove; one end of the limiting spring is connected with the inner wall of the positioning groove, and the other end of the limiting spring is connected with the bottom surface of the limiting block; the third transmission bar is arranged in the square through hole; the right-angle triangular block is arranged at the bottom of the third square groove through a right-angle surface; one end of the third transmission strip is in contact fit with the transmission inclined plane of the limiting block, and the other end of the third transmission strip is fixedly connected with the vertical right-angle surface on the right-angle triangular block; one end of the four-edge telescopic inner rod, which is not provided with the fifth pin hole, is embedded in the four-edge telescopic outer sleeve; the limiting block is matched with the limiting grooves; the return spring is arranged in the quadrangular telescopic outer sleeve; one end of the reset spring is connected with the inner wall of the quadrangular telescopic outer sleeve, and the other end of the reset spring is connected with the quadrangular telescopic inner rod; one end of the four-edge telescopic outer sleeve, which is provided with a sixth pin hole, is arranged between the two side support lugs on the second adjusting mechanism through a second pin; one end of the four-edge telescopic inner rod, which is provided with a fifth pin hole, is arranged between the two side lugs on the first adjusting mechanism through a second pin; the inclined plane of the right-angle triangular block is in contact fit with the second transmission strip; one side of the limiting groove opening close to the fifth pin hole is matched with the reset inclined plane of the limiting block; the side wall of the limiting groove far away from the fifth small hole is matched with the limiting plane of the limiting block.

The two trapezoidal sliding blocks in the first adjusting mechanism and the second adjusting mechanism are respectively arranged in the two trapezoidal sliding grooves on the lying plate in a sliding fit manner.

As a further improvement of the present technology, the connection between the first pin and the first pin hole is a welded connection.

As a further improvement of the present technology, the external dimensions of the first L-shaped connecting block are the same as those of the second L-shaped connecting block.

As a further improvement of the present technology, the external dimensions of the second handle are the same as the external dimensions of the third handle.

As a further improvement of the present technology, the return spring is an extension spring.

As a further improvement of the present technique, the above-mentioned limit spring compresses the spring.

The limiting block has the effects that four people lift the stretcher to stably advance in a normal state, and at the moment, the length of the telescopic rod mechanism is the minimum; the limiting block is embedded into a first limiting groove on the inner wall of the quadrangular telescopic jacket under the action of a limiting spring, a limiting plane of the limiting block is matched with one side surface, close to the opening of the quadrangular telescopic jacket, on the inner wall of the limiting groove, and the telescopic rod cannot be elongated; the first adjusting mechanism and the second adjusting mechanism cannot slide backwards randomly, so that the first adjusting mechanism and the second adjusting mechanism are always positioned in the central positions of two side surfaces of the stretcher; when the four-person lifting stretcher passes through the corner of the stair or the corner of a narrower roadway, a person on one side of the first adjusting mechanism presses the button; the button drives the first transmission strip to move and acts on the transmission strip inclined plane of the second transmission strip; the second transmission bar slides downwards under the action of the first transmission bar; the second transmission strip is used as an inclined plane of the right-angle triangular block, so that the right-angle triangular block drives the third transmission strip to slide towards the direction of the limiting block; the third transmission strip acts on the transmission inclined plane on the limiting block, so that the limiting block moves downwards; the limiting block is separated from the limiting groove, so that the limitation on the quadrangular telescopic coat is removed; meanwhile, people at both sides of the stretcher push the first adjusting mechanism and the second adjusting mechanism to the front and back directions of the stretcher simultaneously; the telescopic rod mechanism extends, the limiting block moves along with the telescopic inner rod, and the first adjusting mechanism and the second adjusting mechanism continue to move to the two ends of the stretcher to proper positions; at the moment, the limiting block moves to a proper limiting groove, and the button is released; the acting force of the third transmission strip on the transmission inclined plane of the limiting block disappears; the limiting block moves upwards under the action of the limiting spring; the limiting block enters a proper limiting groove, and a limiting plane on the limiting block is matched with the inner wall of the limiting groove to limit the telescopic rod mechanism to extend further. After four persons lift the stretcher to pass through the corners of the stairs or the narrow corners of the alleys, the persons at the two sides of the stretcher shift the first adjusting mechanism and the second adjusting mechanism to return to the initial positions; meanwhile, a return spring in the telescopic rod mechanism pulls the quadrangular telescopic inner rod to retract; the notch of the limiting groove acts on the reset inclined plane of the limiting block, so that the limiting block moves downwards and compresses the limiting spring; the limiting block gradually separates from the limiting groove and moves along with the quadrangular telescopic inner rod; in the retraction process of the four-edge telescopic inner rod, the limiting block is matched with each limiting groove meeting the limiting block and then separated from the limiting groove until the limiting block returns to the position of the first limiting groove and is matched with the first limiting groove.

According to the invention, a first adjusting mechanism is in pin connection with a U-shaped block, a second adjusting mechanism is in pin connection with the U-shaped block, and two ends of a telescopic rod mechanism are respectively connected with the first adjusting mechanism and the second adjusting mechanism through two second pins; the lying plate, the first adjusting mechanism, the second adjusting mechanism and the telescopic rod mechanism form a closed four-bar linkage mechanism, and the effect is that when four persons lift the stretcher to walk on a rugged or slippery road, the persons walk to have deep feet and shallow feet, so that the persons on one side of the stretcher may shake or slide, the force for lifting the stretcher on one side is removed, and the persons on the other side still lift the stretcher upwards; at the moment, the first adjusting mechanism or the second adjusting mechanism swings around the first pin under the action of unilateral force; the first adjusting mechanism or the second adjusting mechanism drives the second adjusting mechanism or the first adjusting mechanism to swing around the first pin through the telescopic rod mechanism; such that the forces still acting on the sides of the stretcher act to cause the first and second adjustment mechanisms to oscillate about the respective first pins; the force still acting on the side surface of the stretcher cannot continuously act on the stretcher lying plate upwards, so that the acting forces on the two side surfaces of the stretcher disappear simultaneously; when the person on one side of the stretcher shakes or slips, the four-bar mechanism ensures that the stretcher cannot overturn due to the stress on one side; thereby protecting the stretcher person from sliding off the stretcher and ensuring the safety of the stretcher person.

The trapezoidal sliding block is arranged in the trapezoidal sliding groove in a sliding fit mode, so that when four persons lift the stretcher to pass through the corner of a stair or the corner of a narrower roadway, if the persons at two sides of the stretcher lift the stretcher side by side, the stretcher is likely to pass through the corner more difficultly or cannot pass through the corner due to the space limitation at the corner of the stair or the corner of the roadway; when the invention passes through the corner of a staircase or the corner of a narrower tunnel, a person at one side of the first adjusting mechanism presses the button; the button drives the first transmission strip to move and acts on the transmission strip inclined plane of the second transmission strip; the second transmission bar slides downwards under the action of the first transmission bar; the second transmission strip is used as an inclined plane of the right-angle triangular block, so that the right-angle triangular block drives the third transmission strip to slide towards the direction of the limiting block; the third transmission strip acts on the transmission inclined plane on the limiting block, so that the limiting block moves downwards; the limiting block is separated from the limiting groove, so that the limitation on the quadrangular telescopic coat is removed; at the moment, people at two sides of the stretcher simultaneously push the first adjusting mechanism and the second adjusting mechanism towards the front direction and the rear direction of the stretcher; the telescopic rod mechanism extends, and the first adjusting mechanism and the second adjusting mechanism continue to move to the two ends of the stretcher to proper positions; the positions of people at two sides of the stretcher are staggered relatively, so that the transverse size of the stretcher is reduced, and the stretcher can pass through the corners of stairs or narrow corners of a roadway more easily; after four people lift the stretcher to pass through the corners of the stairs or the narrow corners of the alleys, the people at the two sides of the stretcher return to the initial positions, and the return springs in the telescopic rod mechanisms enable the telescopic rod mechanisms to contract and return to the initial positions.

In the invention, the upper ends of U-shaped blocks in a first adjusting mechanism and a second adjusting mechanism are provided with rotating cavities; the upper end surface of the U-shaped block is provided with a connecting hole which is communicated with the rotating cavity; the rotary round block is arranged in the rotary cavity in a rotating fit manner; the connecting round block is arranged in the connecting hole, and the lower end face of the connecting round block is fixedly connected with the upper end face of the rotating round block; the trapezoidal sliding block is arranged on the upper end face of the connecting round block and has the function that when the first adjusting mechanism and the second adjusting mechanism move towards the two ends of the stretcher simultaneously, the first adjusting mechanism and the second adjusting mechanism respectively rotate around the corresponding connecting round block and the corresponding rotating round block, so that the first adjusting mechanism, the second adjusting mechanism and the telescopic rod mechanism are always in the same plane, and the lying plate, the first adjusting mechanism, the second adjusting mechanism and the telescopic rod mechanism are always a closed four-bar linkage mechanism; no matter where the people on the two sides of the stretcher are located, the stretcher can not be influenced to keep the two sides stable and not swing all the time.

Under normal conditions, the first adjusting mechanism and the second adjusting mechanism are located at the central positions of two sides of the stretcher, people on the two sides of the stretcher exert force simultaneously, and the stretcher runs stably.

When four persons lift the stretcher to walk on a rugged or slippery road, the persons walk deep and shallow with one foot, which may cause the persons on one side of the stretcher to shake or slide, one side of the stretcher is unloaded, and the persons on the other side still lift the stretcher upwards; at the moment, the first L-shaped connecting block or the second L-shaped connecting block swings around the first pin under the action of unilateral force; the first L-shaped connecting block or the second L-shaped connecting block drives the second L-shaped connecting block or the first L-shaped connecting block to swing around the first pin through the telescopic rod mechanism; the force still acting on the side surface of the stretcher only enables the first L-shaped connecting block and the second L-shaped connecting block to swing around the corresponding first pins, and a four-bar linkage formed by the lying plate, the first adjusting mechanism, the second adjusting mechanism and the telescopic rod mechanism is changed into a parallelogram state from a rectangular state; the force still acting on the side surface of the stretcher does not act on the stretcher lying plate upwards any more, so that the acting forces on the two side surfaces of the stretcher disappear simultaneously; when a person lifting the stretcher at one side of the stretcher shakes or slips, the stretcher is prevented from overturning due to the stress on one side; thereby protecting the stretcher person from sliding off the stretcher and ensuring the safety of the stretcher person.

When the four-person lifting stretcher passes through the corner of the stair or the corner of a narrower roadway, a person on one side of the first adjusting mechanism presses the button; the button drives the first transmission strip to move and acts on the transmission strip inclined plane of the second transmission strip; the second transmission bar slides downwards under the action of the first transmission bar; the second transmission strip is used as an inclined plane of the right-angle triangular block, so that the right-angle triangular block drives the third transmission strip to slide towards the direction of the limiting block; the third transmission strip acts on the transmission inclined plane on the limiting block, so that the limiting block moves downwards; the limiting block is separated from the limiting groove, so that the limitation on the quadrangular telescopic coat is removed; at the moment, people at two sides of the stretcher simultaneously push the first adjusting mechanism and the second adjusting mechanism towards the front direction and the rear direction of the stretcher; the telescopic rod mechanism is stretched, the return spring is stretched, and the first adjusting mechanism and the second adjusting mechanism continue to move to the two ends of the stretcher to proper positions; the positions of people at two sides of the stretcher are staggered relatively, so that the transverse size of the stretcher is reduced, and the stretcher can pass through the corners of stairs or narrow corners of a roadway more easily; after four people lift the stretcher to pass through the corners of the stairs or the narrow corners of the alleys, the people at the two sides of the stretcher return to the initial positions, and the return springs in the telescopic rod mechanisms enable the telescopic rod mechanisms to contract and return to the initial positions.

Compared with the traditional stretcher, when a person lifting one side of the stretcher shakes or slips, the stretcher is prevented from overturning due to the stress on one side; thereby protecting the stretcher from sliding off the stretcher and ensuring the safety of the stretcher; when the four-person lifting stretcher passes through the corner of the stair or the corner of a narrower lane, the positions of persons at two sides of the stretcher are staggered relatively, so that the transverse size of the stretcher is reduced, and the stretcher can pass through the corner of the stair or the corner of the narrower lane more easily; the invention has simple structure and better use effect.

Drawings

Fig. 1 is an overall schematic view of the stretcher.

Fig. 2 is a schematic view of a lying board.

Fig. 3 is a schematic perspective view of a first adjustment mechanism.

Fig. 4 is a schematic cross-sectional view of the first adjustment mechanism.

FIG. 5 is a schematic view of the trapezoidal slider, the connecting round block and the rotating round block.

Fig. 6 is a schematic diagram of a U-shaped block.

Fig. 7 is a schematic cross-sectional view of a U-shaped block.

Fig. 8 is a schematic perspective view of a first L-shaped connecting block.

Fig. 9 is a schematic sectional view of the first L-shaped joint block.

Fig. 10 is a perspective schematic view of a second handle.

Fig. 11 is a schematic view of a second adjustment mechanism.

Fig. 12 is a schematic cross-sectional view of a second adjustment mechanism.

Fig. 13 is a schematic view of the third handle and the second L-shaped connecting block.

Fig. 14 is a perspective schematic view of the telescoping rod mechanism.

Fig. 15 is a schematic cross-sectional view of the telescoping rod mechanism.

Fig. 16 is a perspective schematic view of a four-bar telescoping inner pole.

Fig. 17 is a cross-sectional view of a four-bar telescopic inner pole.

Fig. 18 is a schematic view of the engagement of the stopper and the stopper spring.

Fig. 19 is a cross-sectional view of a quad-pod.

Figure 20 is a schematic partial cross-sectional view of the telescoping rod mechanism.

Fig. 21 is a schematic view of a partially assembled cross-section of a stretcher.

Number designation in the figures: 1. a lying board; 2. a trapezoidal chute; 3. a first handle; 4. a first adjustment mechanism; 5. a second adjustment mechanism; 6. a telescopic rod mechanism; 7. a trapezoidal slider; 8. connecting the round blocks; 9. rotating the round block; 10. a U-shaped block; 11. a rotating chamber; 12. connecting holes; 13. a first pin hole; 14. a first L-shaped connecting block; 15. a second pin hole; 16. a first square groove; 17. a second square groove; 18. a second handle; 19. a rectangular hole; 20. a button; 21. a first drive strap; 22. a second drive bar; 23. a drive bar bevel; 24. a first pin; 25. a side lug; 26. a second pin; 27. a second L-shaped connecting block; 28. a third pin hole; 29. a third handle; 30. a quadrangular telescopic coat; 31. a limiting groove; 32. a return spring; 33. a quadrangular telescopic inner rod; 34. a third square groove; 35. positioning a groove; 36. a square through hole; 37. a fifth pin hole; 38. a sixth pin hole; 39. a right-angle triangular block; 40. a third drive bar; 41. a limiting block; 42. a limiting spring; 43. a fourth pin hole; 44. resetting the inclined plane; 45. a transmission bevel; 46. and (5) a limiting plane.

Detailed Description

As shown in fig. 1, the bed comprises a lying plate 1, trapezoidal sliding grooves 2, a first handle 3, a first adjusting mechanism 4, a second adjusting mechanism 5 and a telescopic rod mechanism 6, wherein as shown in fig. 2, the two trapezoidal sliding grooves 2 are formed in the lower surface of the lying plate 1 along the length direction of the lying plate 1; one ends of the two trapezoidal sliding grooves 2 are both positioned on a symmetry axis of the lower surface of the lying plate 1, and the two trapezoidal sliding grooves 2 are centrosymmetric about the lower surface of the lying plate 1; each wide end face of the lying plate 1 is symmetrically provided with a group of first handles 3, and each group is provided with two first handles 3; the two groups of first handles 3 on the two wide end surfaces are mutually symmetrical; as shown in fig. 1, in a normal state, the first adjusting mechanism 4 and the second adjusting mechanism 5 are symmetrically arranged on two sides of the lower surface of the lying plate 1; one end of the telescopic rod mechanism 6 is connected with the first adjusting mechanism 4, and the other end is connected with the second adjusting mechanism 5.

As shown in fig. 3 and 4, the first adjusting mechanism 4 includes a trapezoidal slider 7, a connecting round block 8, a rotating round block 9, a U-shaped block 10, a rotating cavity 11, a connecting hole 12, a first pin hole 13, a first L-shaped connecting block 14, a second pin hole 15, a first square groove 16, a second square groove 17, a second handle 18, a rectangular hole 19, a button 20, a first driving bar 21, a second driving bar 22, a driving bar inclined plane 23, a first pin 24, a side lug 25, and a fourth pin hole 43, wherein as shown in fig. 7, the upper end of the U-shaped block 10 is provided with the rotating cavity 11; the upper end surface of the U-shaped block 10 is provided with a connecting hole 12, and the connecting hole 12 is communicated with the rotating cavity 11; as shown in fig. 6, a first through pin hole 13 is formed between two side surfaces of the U-shaped block 10; as shown in fig. 4, the rotary round block 9 is installed in the rotary cavity 11 by a rotary fit; the connecting round block 8 is arranged in the connecting hole 12, and the lower end face of the connecting round block 8 is fixedly connected with the upper end face of the rotating round block 9; as shown in fig. 5, the trapezoidal slider 7 is mounted on the upper end face of the connecting round block 8; as shown in fig. 8, a second pin hole 15 is formed at the outer side of the L-shaped corner of the first L-shaped connecting block 14; one end face of the first L-shaped connecting block 14 is provided with a first square groove 16, and the other end face is provided with a second square groove 17; as shown in fig. 9, the first square groove 16 is vertically communicated with the second square groove 17; as shown in fig. 3, the first L-shaped connecting block 14 is mounted in the U-shaped opening of the U-shaped block 10 by the first pin 24; the first pin 24 sequentially passes through the first pin hole 13 and the second pin hole 15; as shown in fig. 10, a through rectangular hole 19 is formed between both end surfaces of the second handle 18; as shown in fig. 4, one end of the second handle 18 is mounted on the end surface of the first L-shaped connecting block 14, on which the first square groove 16 is formed, and the orifice of the rectangular hole 19 on the end surface of the second handle 18 is butted with the notch of the first square groove 16 on the first L-shaped connecting block 14; as shown in fig. 3, two side lugs 25 are symmetrically mounted on the end surface of the first L-shaped connecting block 14, on which the second square groove 17 is formed, and the two side lugs 25 are parallel to the side surface of the U-shaped block 10, on which the first pin hole 13 is formed; the two side lugs 25 are provided with through fourth pin holes 43; as shown in fig. 4, one end face of the first transmission bar 21 is provided with a button 20, and the other end thereof passes through the rectangular hole 19 on the second handle 18 and is inserted into the first rectangular groove 16 on the first L-shaped connecting block 14; one end of the second transmission bar 22 is provided with a transmission bar inclined plane 23; one end of the second transmission bar 22, which is provided with a transmission bar inclined plane 23, is inserted into the second square groove 17 on the first L-shaped connecting block 14; the drive bar bevel 23 is in contact engagement with one end of the first drive bar 21.

As shown in fig. 11 and 12, the second adjusting mechanism 5 includes a trapezoidal sliding block 7, a connecting round block 8, a rotating round block 9, a U-shaped block 10, a rotating cavity 11, a connecting hole 12, a first pin hole 13, a second L-shaped connecting block 27, a third pin hole 28, a third handle 29, a first pin 24, a side lug 25, and a fourth pin hole 43, wherein as shown in fig. 6 and 7, the upper end of the U-shaped block 10 is provided with the rotating cavity 11; the upper end surface of the U-shaped block 10 is provided with a connecting hole 12, and the connecting hole 12 is communicated with the rotating cavity 11; a first through pin hole 13 is formed between two side surfaces of the U-shaped block 10; the rotary round block 9 is installed in the rotary cavity 11 in a rotating fit mode; the connecting round block 8 is arranged in the connecting hole 12, and the lower end face of the connecting round block 8 is fixedly connected with the upper end face of the rotating round block 9; as shown in fig. 5, the trapezoidal slider 7 is mounted on the upper end face of the connecting round block 8; as shown in fig. 13, a third pin hole 28 is formed at the outer side of the L-shaped corner of the second L-shaped connecting block 27; as shown in fig. 11, the second L-shaped connecting block 27 is installed in the U-shaped opening of the U-shaped block 10 by the first pin 24; the first pin 24 sequentially passes through the first pin hole 13 and the third pin hole 28; as shown in fig. 13, one end of the third handle 29 is mounted on one end surface of the second L-shaped connecting block 27; as shown in fig. 11, two side lugs 25 are symmetrically mounted on the end surface of the second L-shaped connecting block 27 not connected to the third handle 29, and the two side lugs 25 are parallel to the side surface of the U-shaped block 10 on which the first pin holes 13 are formed; the side lugs 25 are provided with fourth pin holes 43 therethrough.

As shown in fig. 14 and 15, the telescopic rod mechanism 6 includes a four-edge telescopic outer sleeve 30, a limiting groove 31, a sixth pin hole 38, a second pin 26, a return spring 32, a four-edge telescopic inner rod 33, a third groove 34, a positioning groove 35, a square through hole 36, a fifth pin hole 37, a right-angled triangle block 39, a third transmission bar 40, a limiting block 41, and a limiting spring 42, wherein as shown in fig. 19, a plurality of limiting grooves 31 are uniformly formed on one side surface of the inner wall of the four-edge telescopic outer sleeve 30 along the length direction of the four-edge telescopic outer sleeve 30; a through sixth pin hole 38 is formed between two opposite side surfaces at the end, which is not provided with the sleeve opening, of the four-edge telescopic outer sleeve 30; as shown in fig. 16 and 17, a through fifth pin hole 37 is formed between two opposite side surfaces at one end of the four-bar telescopic inner rod 33; the two ends of one side surface of the quadrangular telescopic inner rod 33, which is not provided with the fifth pin hole 37, are respectively provided with a third square groove 34 and a positioning groove 35; the third square groove 34 is positioned at one end of the four-edge telescopic inner rod 33, which is provided with a fifth pin hole 37; a square through hole 36 is formed in the quadrangular telescopic inner rod 33 along the length direction, and two ends of the square through hole 36 are respectively communicated with the third square groove 34 and the positioning groove 35; as shown in fig. 18, the limiting block 41 is provided with a reset inclined plane 44, a transmission inclined plane 45 and a limiting plane 46; as shown in fig. 15, the stopper 41 is mounted in the positioning groove 35 by a sliding fit; the limiting spring 42 is positioned in the positioning groove 35; one end of the limiting spring 42 is connected with the inner wall of the positioning groove 35, and the other end is connected with the bottom surface of the limiting block 41; the third transmission bar 40 is arranged in the square through hole 36; the right-angle triangular block 39 is arranged at the bottom of the third square groove 34 through a right-angle surface; one end of the third transmission strip 40 is in contact fit with the transmission inclined surface 45 of the limiting block 41, and the other end of the third transmission strip is fixedly connected with the vertical right-angle surface on the right-angle triangular block 39; the end of the four-edge telescopic inner rod 33, which is not provided with the fifth pin hole 37, is nested in the four-edge telescopic outer sleeve 30; the limiting blocks 41 are matched with the limiting grooves 31; the return spring 32 is arranged in the four-edge telescopic outer sleeve 30; one end of a return spring 32 is connected with the inner wall of the quadrangular telescopic outer sleeve 30, and the other end is connected with a quadrangular telescopic inner rod 33; one end of the four-edge telescopic outer sleeve 30, which is provided with a sixth pin hole 38, is arranged between the two side lugs 25 on the second adjusting mechanism 5 through a second pin 26; one end of the four-edge telescopic inner rod 33 provided with a fifth pin hole 37 is arranged between the two side lugs 25 on the first adjusting mechanism 4 through a second pin 26; as shown in fig. 21, the inclined surface of the right-angle triangular block 39 is in contact fit with the second transmission bar 22; as shown in fig. 20, one side of the notch of the limiting groove 31 close to the fifth pin hole 37 is matched with the reset inclined surface 44 of the limiting block 41; the side wall of the limiting groove 31 far away from the fifth small hole is matched with the limiting plane 46 of the limiting block 41.

As shown in fig. 1, the two trapezoidal sliders 7 of the first adjusting mechanism 4 and the second adjusting mechanism 5 are respectively mounted in the two trapezoidal sliding grooves 2 of the lying plate 1 by sliding fit.

As shown in fig. 3, the connection between the first pin 24 and the first pin hole 13 is a welded connection.

As shown in fig. 8 and 13, the first L-shaped connecting block 14 has the same outer dimension as the second L-shaped connecting block 27.

As shown in fig. 3 and 11, the external dimensions of the second handle 18 are the same as those of the third handle 29.

As shown in fig. 14, the return spring 32 is an extension spring.

As shown in fig. 18, the above-mentioned limit spring 42 compresses the spring.

The limiting block 41 has the function that four people lift the stretcher to stably advance in a normal state, and at the moment, the length of the telescopic rod mechanism 6 is the minimum; the limiting block 41 is embedded into the first limiting groove 31 on the inner wall of the four-edge telescopic jacket 30 under the action of the limiting spring 42, the limiting plane 46 of the limiting block 41 is matched with one side surface, close to the opening of the four-edge telescopic jacket 30, on the inner wall of the limiting groove 31, and the telescopic rod cannot be elongated; the first adjusting mechanism 4 and the second adjusting mechanism 5 cannot slide backwards randomly, so that the first adjusting mechanism 4 and the second adjusting mechanism 5 are always positioned at the central positions of two side surfaces of the stretcher; when four persons lift the stretcher to pass the corner of the staircase or the corner of the narrower alley, the person on the side of the first adjustment mechanism 4 presses the button 20; the button 20 drives the first transmission bar 21 to move and acts on the transmission bar inclined plane 23 of the second transmission bar 22; the second transmission bar 22 slides downwards under the action of the first transmission bar 21; the second transmission bar 22 acts on the inclined surface of the right-angled triangle block 39, so that the right-angled triangle block 39 drives the third transmission bar 40 to slide towards the direction of the limiting block 41; the third transmission bar 40 acts on the transmission inclined plane 45 on the limiting block 41, so that the limiting block 41 moves downwards; the limiting block 41 is separated from the limiting groove 31, so that the limitation on the four-edge telescopic coat 30 is released; meanwhile, people at both sides of the stretcher push the first adjusting mechanism 4 and the second adjusting mechanism 5 to the front and back directions of the stretcher simultaneously; the telescopic rod mechanism 6 extends, the limiting block 41 moves along with the telescopic inner rod, and the first adjusting mechanism 4 and the second adjusting mechanism 5 continue to move to the proper positions towards the two ends of the stretcher; at this time, the stopper 41 moves to the appropriate stopper groove 31, and the button 20 is released; the acting force of the third transmission strip 40 on the transmission inclined plane 45 of the limiting block 41 disappears; the limiting block 41 moves upwards under the action of the limiting spring 42; the limiting block 41 enters the proper limiting groove 31, and the limiting plane 46 on the limiting block 41 is matched with the inner wall of the limiting groove 31 to limit the telescopic rod mechanism 6 to extend further. After four people lift the stretcher to pass through the corners of the stairs or the narrow corners of the alleys, people at two sides of the stretcher shift the first adjusting mechanism 4 and the second adjusting mechanism 5 to return to the initial positions; meanwhile, a return spring 32 in the telescopic rod mechanism 6 pulls the quadrangular telescopic inner rod 33 to retract; the notch of the stopper groove 31 acts on the reset slope 44 of the stopper 41, so that the stopper 41 moves downward and compresses the stopper spring 42; the limiting block 41 gradually separates from the limiting groove 31 and moves along with the quadrangular telescopic inner rod 33; during the retraction of the four-bar telescopic rod 33, the stopper 41 engages with each of the stopper grooves 31 meeting therewith and then disengages from the stopper groove 31 until it returns to the position of the first stopper groove 31 and engages therewith.

According to the invention, a first adjusting mechanism 4 is in pin connection with a U-shaped block 10, a second adjusting mechanism 5 is in pin connection with the U-shaped block 10, and two ends of a telescopic rod mechanism 6 are respectively connected with the first adjusting mechanism 4 and the second adjusting mechanism 5 through two second pins 26; the lying plate 1, the first adjusting mechanism 4, the second adjusting mechanism 5 and the telescopic rod mechanism 6 form a closed four-bar linkage mechanism, so that when four persons lift the stretcher to walk on a rugged or slippery road, the persons walk deep and shallow with one foot, and the persons on one side of the stretcher may shake or slide to the other side, the force for lifting the stretcher on one side is removed, and the persons on the other side still lift the stretcher upwards; at this time, the first adjusting mechanism 4 or the second adjusting mechanism 5 swings around the first pin 24 under the action of a single-sided force; the first adjusting mechanism 4 or the second adjusting mechanism 5 drives the second adjusting mechanism 5 or the first adjusting mechanism 4 to swing around the first pin 24 through the telescopic rod mechanism 6; so that the forces still acting on the sides of the stretcher act to cause the first adjustment mechanism 4 and the second adjustment mechanism 5 to oscillate about the respective first pins 24; the force still acting on the side surface of the stretcher can not continuously act on the stretcher lying plate 1 upwards, so that the acting forces on the two side surfaces of the stretcher disappear simultaneously; when the person on one side of the stretcher shakes or slips, the four-bar mechanism ensures that the stretcher cannot overturn due to the stress on one side; thereby protecting the stretcher person from sliding off the stretcher and ensuring the safety of the stretcher person.

The trapezoidal sliding block 7 is arranged in the trapezoidal sliding groove 2 in a sliding fit mode, so that when four persons lift the stretcher to pass through the corner of a stair or the corner of a narrower roadway, if the persons at two sides of the stretcher lift the stretcher side by side, the stretcher is likely to pass through the corner more difficultly or cannot pass through due to the space limitation at the corner of the stair or the corner of the roadway; when the invention passes through the corner of the staircase or the narrow corner of the tunnel, a person at one side of the first adjusting mechanism 4 presses the button 20; the button 20 drives the first transmission bar 21 to move and acts on the transmission bar inclined plane 23 of the second transmission bar 22; the second transmission bar 22 slides downwards under the action of the first transmission bar 21; the second transmission bar 22 acts on the inclined surface of the right-angled triangle block 39, so that the right-angled triangle block 39 drives the third transmission bar 40 to slide towards the direction of the limiting block 41; the third transmission bar 40 acts on the transmission inclined plane 45 on the limiting block 41, so that the limiting block 41 moves downwards; the limiting block 41 is separated from the limiting groove 31, so that the limitation on the four-edge telescopic coat 30 is released; at the moment, people at two sides of the stretcher simultaneously push the first adjusting mechanism 4 and the second adjusting mechanism 5 towards the front and back directions of the stretcher; the telescopic rod mechanism 6 extends, and the first adjusting mechanism 4 and the second adjusting mechanism 5 continue to move to the two ends of the stretcher to proper positions; the positions of people at two sides of the stretcher are staggered relatively, so that the transverse size of the stretcher is reduced, and the stretcher can pass through the corners of stairs or narrow corners of a roadway more easily; when four persons lift the stretcher to pass through the corners of the stairs or the narrow corners of the alleys, the persons at both sides of the stretcher return to the initial position, and the return spring 32 in the telescopic rod mechanism 6 enables the telescopic rod mechanism 6 to retract and return to the initial position.

In the invention, the upper ends of U-shaped blocks 10 in a first adjusting mechanism 4 and a second adjusting mechanism 5 are provided with rotating cavities 11; the upper end surface of the U-shaped block 10 is provided with a connecting hole 12, and the connecting hole 12 is communicated with the rotating cavity 11; the rotary round block 9 is installed in the rotary cavity 11 in a rotating fit mode; the connecting round block 8 is arranged in the connecting hole 12, and the lower end face of the connecting round block 8 is fixedly connected with the upper end face of the rotating round block 9; the trapezoidal sliding block 7 is arranged on the upper end face of the connecting round block 8 and has the effect that when the first adjusting mechanism 4 and the second adjusting mechanism 5 move towards the two ends of the stretcher simultaneously, the first adjusting mechanism 4 and the second adjusting mechanism 5 respectively rotate around the corresponding connecting round block 8 and the corresponding rotating round block 9, so that the first adjusting mechanism 4, the second adjusting mechanism 5 and the telescopic rod mechanism 6 are always positioned in the same plane, and the lying plate 1, the first adjusting mechanism 4, the second adjusting mechanism 5 and the telescopic rod mechanism 6 are always a closed four-bar linkage; no matter where the people on the two sides of the stretcher are located, the stretcher can not be influenced to keep the two sides stable and not swing all the time.

The specific implementation mode is as follows: under normal conditions, the first adjusting mechanism 4 and the second adjusting mechanism 5 are positioned at the central positions of two sides of the stretcher, so that people on the two sides of the stretcher exert force simultaneously, and the stretcher runs stably.

When four persons lift the stretcher to walk on a rugged or slippery road, the persons walk deep and shallow with one foot, which may cause the persons on one side of the stretcher to shake or slide, one side of the stretcher is unloaded, and the persons on the other side still lift the stretcher upwards; at this time, the first L-shaped connecting block 14 or the second L-shaped connecting block 27 swings around the first pin 24 under a unilateral force; the first L-shaped connecting block 14 or the second L-shaped connecting block 27 drives the second L-shaped connecting block 27 or the first L-shaped connecting block 14 to swing around the first pin 24 through the telescopic rod mechanism 6; the forces still acting on the side of the stretcher only cause the first L-shaped connecting block 14 and the second L-shaped connecting block 27 to swing around the corresponding first pin 24, and the four-bar linkage formed by the lying plate 1, the first adjusting mechanism 4, the second adjusting mechanism 5 and the telescopic rod mechanism 6 changes from a rectangular state to a parallelogram state; the force still acting on the side surface of the stretcher does not act on the stretcher lying plate 1 upwards any more, so that the acting forces on the two side surfaces of the stretcher disappear simultaneously; when a person lifting the stretcher at one side of the stretcher shakes or slips, the stretcher is prevented from overturning due to the stress on one side; thereby protecting the stretcher person from sliding off the stretcher and ensuring the safety of the stretcher person.

When four persons lift the stretcher to pass the corner of the staircase or the corner of the narrower alley, the person on the side of the first adjustment mechanism 4 presses the button 20; the button 20 drives the first transmission bar 21 to move and acts on the transmission bar inclined plane 23 of the second transmission bar 22; the second transmission bar 22 slides downwards under the action of the first transmission bar 21; the second transmission bar 22 acts on the inclined surface of the right-angled triangle block 39, so that the right-angled triangle block 39 drives the third transmission bar 40 to slide towards the direction of the limiting block 41; the third transmission bar 40 acts on the transmission inclined plane 45 on the limiting block 41, so that the limiting block 41 moves downwards; the limiting block 41 is separated from the limiting groove 31, so that the limitation on the four-edge telescopic coat 30 is released; at the moment, people at two sides of the stretcher simultaneously push the first adjusting mechanism 4 and the second adjusting mechanism 5 towards the front and back directions of the stretcher; the telescopic rod mechanism 6 is extended, the return spring 32 is extended, and the first adjusting mechanism 4 and the second adjusting mechanism 5 continue to move to the proper positions towards the two ends of the stretcher; the positions of people at two sides of the stretcher are staggered relatively, so that the transverse size of the stretcher is reduced, and the stretcher can pass through the corners of stairs or narrow corners of a roadway more easily; when four persons lift the stretcher to pass through the corners of the stairs or the narrow corners of the alleys, the persons at both sides of the stretcher return to the initial position, and the return spring 32 in the telescopic rod mechanism 6 enables the telescopic rod mechanism 6 to retract and return to the initial position.

In conclusion, the invention has the beneficial effects that: when a person lifting the stretcher at one side of the stretcher shakes or slips, the stretcher is prevented from overturning due to the stress of one side; thereby protecting the stretcher from sliding off the stretcher and ensuring the safety of the stretcher; when the four-person lifting stretcher passes through the corner of the stair or the corner of the narrower lane, the positions of the persons at the two sides of the stretcher are staggered relatively, and the transverse size of the stretcher is reduced, so that the stretcher can pass through the corner of the stair or the corner of the narrower lane more easily.

Claims

1. The utility model provides a stretcher with adjustable medical field many people can lift which characterized in that: the multifunctional lying board comprises a lying board, trapezoidal sliding grooves, a first handle, a first adjusting mechanism, a second adjusting mechanism and a telescopic rod mechanism, wherein the two trapezoidal sliding grooves are formed in the lower surface of the lying board along the length direction of the lying board; one ends of the two trapezoidal sliding grooves are positioned on the symmetry axis of the lower surface of the lying plate, and the two trapezoidal sliding grooves are centrosymmetric around the lower surface of the lying plate; each wide end face of the lying plate is symmetrically provided with a group of first handles, and each group is provided with two first handles; the two groups of first handles on the two wide end surfaces are mutually symmetrical; under a normal state, the first adjusting mechanism and the second adjusting mechanism are symmetrically arranged on two sides of the lower surface of the lying plate; one end of the telescopic rod mechanism is connected with the first adjusting mechanism, and the other end of the telescopic rod mechanism is connected with the second adjusting mechanism;

the first adjusting mechanism comprises a trapezoidal sliding block, a connecting round block, a rotating round block, a U-shaped block, a rotating cavity, a connecting hole, a first pin hole, a first L-shaped connecting block, a second pin hole, a first square groove, a second handle, a rectangular hole, a button, a first transmission strip, a second transmission strip, a transmission strip inclined plane, a first pin, a side support lug and a fourth pin hole, wherein the upper end of the U-shaped block is provided with the rotating cavity; the upper end surface of the U-shaped block is provided with a connecting hole which is communicated with the rotating cavity; a first through pin hole is formed between two side surfaces of the U-shaped block; the rotary round block is arranged in the rotary cavity in a rotating fit manner; the connecting round block is arranged in the connecting hole, and the lower end face of the connecting round block is fixedly connected with the upper end face of the rotating round block; the trapezoidal sliding block is arranged on the upper end surface of the connecting round block; a second pin hole is formed in the outer side of the corner of the L-shaped surface of the first L-shaped connecting block; one end face of the first L-shaped connecting block is provided with a first square groove, and the other end face of the first L-shaped connecting block is provided with a second square groove; the first square groove is vertically communicated with the second square groove; the first L-shaped connecting block is arranged in a U-shaped opening of the U-shaped block through a first pin; the first pin sequentially passes through the first pin hole and the second pin hole; a through rectangular hole is formed between the two end surfaces of the second handle; one end of the second handle is arranged on the end face of the first L-shaped connecting block, which is provided with the first square groove, and the orifice of the rectangular hole on the end face of the second handle is butted with the notch of the first square groove on the first L-shaped connecting block; two side support lugs are symmetrically arranged on the end face of the first L-shaped connecting block, which is provided with the second square groove, and the two side support lugs are parallel to the side face of the U-shaped block, which is provided with the first pin hole; the two side lugs are provided with a through fourth pin hole; a button is arranged on one end face of the first transmission strip, and the other end of the first transmission strip penetrates through a rectangular hole in the second handle and is inserted into a first square groove in the first L-shaped connecting block; one end of the second transmission bar is provided with a transmission bar inclined plane; one end of the second transmission strip, which is provided with a transmission strip inclined plane, is inserted into a second square groove on the first L-shaped connecting block; the inclined surface of the transmission strip is in contact fit with one end of the first transmission strip;

the second adjusting mechanism comprises a trapezoidal sliding block, a connecting round block, a rotating round block, a U-shaped block, a rotating cavity, a connecting hole, a first pin hole, a second L-shaped connecting block, a third pin hole, a third handle, a first pin, a side support lug and a fourth pin hole, wherein the upper end of the U-shaped block is provided with the rotating cavity; the upper end surface of the U-shaped block is provided with a connecting hole which is communicated with the rotating cavity; a first through pin hole is formed between two side surfaces of the U-shaped block; the rotary round block is arranged in the rotary cavity in a rotating fit manner; the connecting round block is arranged in the connecting hole, and the lower end face of the connecting round block is fixedly connected with the upper end face of the rotating round block; the trapezoidal sliding block is arranged on the upper end surface of the connecting round block; a third pin hole is formed in the outer side of the corner of the L-shaped surface of the second L-shaped connecting block; the second L-shaped connecting block is arranged in a U-shaped opening of the U-shaped block through a first pin; the first pin sequentially passes through the first pin hole and the third pin hole; one end of the third handle is arranged on one end surface of the second L-shaped connecting block; two side support lugs are symmetrically arranged on the end face, which is not connected with the third handle, of the second L-shaped connecting block, and the two side support lugs are parallel to the side face, which is provided with the first pin hole, of the U-shaped block; the two side lugs are provided with a through fourth pin hole;

the telescopic rod mechanism comprises a quadrangular telescopic outer sleeve, a limiting groove, a sixth pin hole, a second pin, a reset spring, a quadrangular telescopic inner rod, a third square groove, a positioning groove, a square through hole, a fifth pin hole, a right-angle triangular block, a third transmission strip, a limiting block and a limiting spring, wherein a plurality of limiting grooves are uniformly formed in one side surface of the inner wall of the quadrangular telescopic outer sleeve along the length direction of the quadrangular telescopic outer sleeve; a through sixth pin hole is formed between two opposite side surfaces of one end, which is not provided with the sleeve opening, of the four-edge telescopic outer sleeve; a through fifth pin hole is formed between two opposite side surfaces at one end of the quadrangular telescopic inner rod; a third square groove and a positioning groove are respectively formed in two ends of one side surface, which is not provided with the fifth pin hole, of the four-edge telescopic inner rod; the third square groove is positioned at one end of the four-edge telescopic inner rod, which is provided with a fifth pin hole; a square through hole is formed in the quadrangular telescopic inner rod along the length direction, and two ends of the square through hole are respectively communicated with the third square groove and the positioning groove; the limiting block is provided with a reset inclined plane, a transmission inclined plane and a limiting plane; the limiting block is arranged in the positioning groove in a sliding fit manner; the limiting spring is positioned in the positioning groove; one end of the limiting spring is connected with the inner wall of the positioning groove, and the other end of the limiting spring is connected with the bottom surface of the limiting block; the third transmission bar is arranged in the square through hole; the right-angle triangular block is arranged at the bottom of the third square groove through a right-angle surface; one end of the third transmission strip is in contact fit with the transmission inclined plane of the limiting block, and the other end of the third transmission strip is fixedly connected with the vertical right-angle surface on the right-angle triangular block; one end of the four-edge telescopic inner rod, which is not provided with the fifth pin hole, is embedded in the four-edge telescopic outer sleeve; the limiting block is matched with the limiting grooves; the return spring is arranged in the quadrangular telescopic outer sleeve; one end of the reset spring is connected with the inner wall of the quadrangular telescopic outer sleeve, and the other end of the reset spring is connected with the quadrangular telescopic inner rod; one end of the four-edge telescopic outer sleeve, which is provided with a sixth pin hole, is arranged between the two side support lugs on the second adjusting mechanism through a second pin; one end of the four-edge telescopic inner rod, which is provided with a fifth pin hole, is arranged between the two side lugs on the first adjusting mechanism through a second pin; the inclined plane of the right-angle triangular block is in contact fit with the second transmission strip; one side of the limiting groove opening close to the fifth pin hole is matched with the reset inclined plane of the limiting block; the side wall of the limiting groove far away from the fifth small hole is matched with a limiting plane of the limiting block;

2. The adjustable multi-person liftable stretcher in the medical field according to claim 1, wherein: the connection between the first pin and the first pin hole is welded connection.

3. The adjustable multi-person liftable stretcher in the medical field according to claim 1, wherein: the appearance size of the first L-shaped connecting block is the same as that of the second L-shaped connecting block.

4. The adjustable multi-person liftable stretcher in the medical field according to claim 1, wherein: the appearance size of the second handle is the same as that of the third handle.

5. The adjustable multi-person liftable stretcher in the medical field according to claim 1, wherein: the return spring is an extension spring.

6. The adjustable multi-person liftable stretcher in the medical field according to claim 1, wherein: the limiting spring compresses the spring.