Blood collection pad replacement workbench

Abstract

The present invention relates to a mechanically automatic blood collection pad replacement workbench for blood collection. The workbench is characterized in that it includes a table frame, on which a feeding box and a recycling box are provided. The feeding box is provided with a support plate, on which a storage box is provided, the storage box has a discharge hole, and the feeding box has a feeding hole. The bottom of the storage box is provided with a material selection hole. A shift fork mechanism is provided below the support plate, the shift fork of the shift fork mechanism extends into the material selection hole, and the shift fork mechanism is connected to a tilting lever mechanism. A rubbing wheel mechanism is provided at the front end of the support plate. A flap is hinged on the upper surface of the recycling box. A push plate is provided inside the recycling box, and a first compression spring is evenly distributed under the push plate. A traction mechanism is connected to the bottom of the push plate, and the traction mechanism is connected to the tilting lever mechanism. A spring seat is provided in front of the table frame, and the front end of the tilting lever mechanism is located below the seat cushion of the spring seat. The use of this workbench for blood collection operations does not require electric drive, which not only avoids energy consumption but also is not easy to damage, thereby greatly reducing the cost of use.

Description

Technical Field

[0001] The invention relates to medical equipment, in particular to a mechanical blood sampling pad automatic replacement workbench for blood sampling. Background Art

[0002] In the medical industry, doctors often need to draw blood for diagnostic tests, making it the most labor-intensive testing task in every hospital. To ensure sterility during blood draws, a sterile pad is placed under the patient's arm. Due to the high workload, it's common for doctors to forget to replace the pad or do so too late, potentially leading to cross-infection.

[0003] To address the problem of delayed blood sampling pad replacement, a number of automated blood sampling pad replacement devices have emerged on the market. Conventional automated blood sampling pad replacement devices typically consist of a base with a discharge box and a recovery box at either end. The discharge box contains a rotating shaft on which a continuous stream of sterile pads is wound, while the recovery box contains a rotating shaft connected to a stepper motor for rewinding and recycling the used sterile pads from the discharge box. The stepper motor's rotation can be controlled semi-automatically by manually turning a switch or fully automatically by a controller combined with a sensor. These automated blood sampling pad replacement devices all rely on electrical power. Their high usage rates and frequent start-stop cycles not only consume significant energy but also easily damage the motor and electronic components, requiring frequent maintenance and significantly increasing operating costs. For hospitals, using such devices in blood sampling procedures is environmentally unfriendly and inconvenient, making them unprofitable. For patients, the increased operating costs of these devices are inevitably passed on to them, increasing their medical burden. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art and provide a mechanical automatic blood collection pad replacement workbench for blood collection. When using this workbench for blood collection, the patient only needs to sit down or stand up to drive its mechanical structure to automatically replace the blood collection pad. No electric drive is required, which not only avoids energy consumption, but also is not easy to damage, and can greatly reduce the cost of use.

[0005] In order to solve the above problems, the following technical solutions are adopted:

[0006] The mechanical, automatic blood collection pad replacement workbench for blood collection of the present invention is characterized in that it includes a table frame, on which a feed box and a recovery box are arranged in sequence from back to front. The feed box contains a support plate, and above the support plate is a storage box for storing blood collection pads. The front bottom of the storage box has a horizontally arranged elongated discharge hole, and the front side wall of the feeding box corresponding to the discharge hole has a feed hole. The bottom of the storage box has elongated material selection holes arranged longitudinally along the table frame, and the support plate corresponding to the material selection holes has a clearance hole. Below the support plate is a shift fork mechanism, the upper end of the shift fork mechanism extends into the material selection hole of the storage box, and the lower part of the shift fork mechanism is connected to a tilting rod mechanism, which can push the shift fork mechanism to slide longitudinally along the table frame. The front end of the support plate has a downward step, and above the step is a rubbing wheel mechanism that is linked to the shift fork mechanism. The rubbing wheel mechanism is used to send the blood collection pad out of the discharge hole of the storage box through the feed hole of the feeding box. The recycling box has an opening on its upper surface, with hinged flaps at the front and rear edges of the opening. A horizontally arranged push plate is located within the recycling box, with first compression springs interposed between the push plate and the bottom of the recycling box. A traction mechanism is connected below the push plate, which is connected to the tilting lever mechanism so that it can be linked with the shifting fork mechanism. The upper surface of the recycling box is no higher than the lower edge of the feed hole of the feed box. A spring seat is located in front of the table frame, with the front end of the tilting lever mechanism extending from the bottom of the table frame and positioned below the seat cushion of the spring seat.

[0007] The upper end of the material storage box is open, and an elastic pressure plate is arranged inside the elastic pressure plate. The outer shell of the elastic pressure plate is made of elastic material, springs are evenly distributed inside the outer shell, and a weight is fixed on the upper part of the elastic pressure plate.

[0008] The shift fork mechanism includes a slider, a slide bar arranged longitudinally along the table frame is provided below the support plate, the slider is located on the slide bar and the two are in sliding fit. The shift fork is fixed on the upper surface of the slider.

[0009] A first connecting rod is hingedly connected to the lower portion of the slider, and a second connecting rod is hingedly connected to the inner side wall of the rear end of the feed box. A sliding sleeve is mounted on the second connecting rod, and the outer ends of the first and second connecting rods are hingedly matched. An L-shaped tilting rod is located below the table frame. The upper end of the vertical portion of the tilting rod passes through the table frame and is hingedly matched to the sliding sleeve. The front end of the horizontal portion of the tilting rod extends upward at an angle. A rod seat is located below the front end of the table frame, and the inclined portion of the tilting rod is hingedly matched to the lower end of the rod seat. The outer end of the inclined portion of the tilting rod is located below the seat cushion of the spring seat. The first connecting rod, second connecting rod, sliding sleeve, tilting rod, and rod seat constitute the tilting rod mechanism.

[0010] At least three pull ropes are evenly connected to the middle of the lower surface of the push plate. The lower ends of the pull ropes converge and are connected to an elastic ring. The elastic ring is connected to a traction rope, which extends vertically downward and is connected to the horizontal portion of the tilting rod. The pull ropes, elastic ring, and traction ropes constitute the traction mechanism.

[0011] The rubbing wheel mechanism comprises two horizontally arranged, vertically parallel rotating shafts, each end of which is rotatably engaged with the side walls of the two feeding boxes. A large gear and a rubbing wheel are mounted on each shaft, meshing with each other. The two rubbing wheels correspond to each other vertically, with a gap between them corresponding to the position of the discharge hole of the storage box. A small gear is coaxially connected to the large gear on the lower shaft, and a horizontally arranged rack is connected to the front end of the shift fork mechanism. This rack extends through the vertical wall of the step at the front end of the support plate and meshes with the small gear.

[0012] The push plate is rectangular and has through holes at its four corners. Vertically arranged guide rods are provided at the four corners of the recycling box, and the through holes at the four corners of the push plate are sleeved on the corresponding guide rods.

[0013] The spring seat includes a base with a vertically arranged sleeve fixed on the base, a vertically arranged insertion rod fixed below the seat cushion, the lower end of the insertion rod inserted into the sleeve of the base, and a second compression spring externally mounted on the sleeve, the upper end of the second compression spring extending to the bottom of the seat cushion.

[0014] The above solution has the following advantages:

[0015] The mechanical automatic replacement blood sampling pad workbench for blood sampling of the present invention includes a table frame, and a feeding box and a recycling box are arranged on the table frame from back to front in sequence; a support plate is provided in the feeding box, and a storage box is provided above the support plate, and a discharge hole is provided at the bottom front end of the storage box, and a feeding hole is provided on the front end side wall of the feeding box corresponding to the discharge hole; a shifting hole is provided at the bottom of the storage box; a shifting fork mechanism is provided below the support plate, and the upper end of the shifting fork of the shifting fork mechanism extends into the shifting hole of the storage box, and a tilting rod mechanism is connected to the bottom of the shifting fork mechanism, which can push the shifting fork mechanism to slide longitudinally along the table frame; a downward step is provided at the front end of the support plate, and a tilting rod mechanism is provided above the step to connect to the shifting fork mechanism A linked rubbing wheel mechanism is used to deliver the blood collection pads from the discharge hole of the storage box through the feed hole of the feed box. The collection box has an opening on its upper surface, with hinged flaps at the front and rear edges of the opening. A horizontally arranged push plate is located within the collection box, with first compression springs interposed between the push plate and the bottom of the collection box. A traction mechanism is connected below the push plate, which is connected to the tilting lever mechanism so that it can be linked with the shifting fork mechanism. The top surface of the collection box is no higher than the bottom edge of the feed hole of the feed box. A spring seat is located in front of the table frame, with the front end of the tilting lever mechanism extending from the bottom of the table frame and positioned below the seat cushion of the spring seat. Before use, sterile blood collection pads are stacked and placed in the storage box. When a patient needs blood drawn, they must sit on the spring seat. The seat cushion presses down on the front end of the tilting lever mechanism, causing the rear end of the tilting lever mechanism to tilt up, releasing the traction mechanism, causing the push plate of the collection box to push upward under the action of the first compression spring, pushing the flap of the opening horizontally and closing. At the same time, the rear end of the tilting lever mechanism tilts up, driving the fork mechanism to slide forward. The fork then pushes the blood sampling pad at the bottom layer of the storage box out of the discharge hole. At this point, the rubbing wheel mechanism, linked to the fork mechanism, delivers the blood sampling pad from the discharge hole through the feed hole of the feed box to the flap of the recycling box. The patient can now place their arm on the blood sampling pad for blood collection. After the blood collection is complete, the patient stands up and leaves. The spring seat cushion resets, the tilting lever mechanism also resets, and the rear end of the tilting lever mechanism drops, tightening the traction mechanism, causing the push plate of the recycling box to descend, opening the flap at the opening, and the used blood sampling pad to fall into the recycling box. At the same time, the rear end of the tilting lever mechanism drops, driving the fork mechanism to slide backward and reset. It can be seen from this that the mechanical automatic replacement blood collection pad workbench for blood collection of the present invention can drive its mechanical structure to automatically complete the replacement and recycling operations of the blood collection pad only through the patient's sitting down and standing up movements. It does not require electric drive and there are no start-stop movements of any electrical components. It not only avoids energy consumption, but is also not easy to damage and is easy to repair and maintain, which can greatly reduce the cost of use and alleviate the burden on hospitals and patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a mechanical automatic blood sampling pad replacement workbench for blood sampling of the present invention;

[0017] Figure 2 yes Figure 1 Enlarged schematic diagram of the middle AA direction;

[0018] Figure 3 yes Figure 1 Enlarged schematic diagram of the middle BB direction. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below with reference to the accompanying drawings.

[0020] like Figure 1 、 Figure 2 and Figure 3 As shown, the mechanical automatic blood collection pad replacement workbench for blood collection of the present invention includes a table frame 1, on which a feed box 2 and a recovery box 18 are arranged in sequence from back to front. The feed box 2 has a support plate 3, and above the support plate 3 is a storage box 6 for storing blood collection pads 9. The front bottom of the storage box 6 has a horizontally arranged long strip discharge hole 10, and the discharge hole 10 corresponds to a feed hole 16 on the front side wall of the feed box 2. The bottom of the storage box 6 has a long strip material selection hole 26 arranged longitudinally along the table frame 1, and the support plate 3 corresponding to the material selection hole 26 has a clearance hole.

[0021] The upper end of the storage box 6 is open, housing an elastic pressure plate 7. The outer shell of the elastic pressure plate 7 is made of an elastic material and is evenly distributed with springs. A weight 8 is secured to the upper portion of the elastic pressure plate 7. The weight 8 provides a compacting effect. As the blood sampling pad 9 is consumed, the elastic pressure plate 7 gradually descends. The springs within ensure that the blood sampling pad 9 remains compacted while allowing for a certain amount of upward and downward movement.

[0022] There is a fork mechanism below the support plate 3, and the upper end of the fork 27 of the fork mechanism extends into the material shifting hole 26 of the storage box 6. The bottom of the fork mechanism is connected to a tilting rod mechanism, which can push the fork mechanism to slide longitudinally along the table frame 1.

[0023] A spring seat is located in front of the table frame 1. The front end of the tilting lever mechanism extends from the bottom of the table frame 1 and is located below the spring seat's cushion 32. The spring seat includes a base 36, to which a vertically arranged sleeve 34 is fixed. A vertically arranged insertion rod 33 is fixed below the cushion 32, with the lower end of the insertion rod 33 inserted into the sleeve 34 of the base 36. A second compression spring 35 is mounted on the sleeve 34, the upper end of which extends to the bottom of the cushion 32.

[0024] like Figure 1As shown, in this embodiment, the shift fork mechanism includes a slider 5. Below the support plate 3, there is a slide bar 4 arranged longitudinally along the table frame 1. The slider 5 is located on the slide bar 4 and the two are in a sliding fit. The shift fork 27 is fixed to the upper surface of the slider 5. The lower part of the slider 5 is hinged with a first connecting rod 28. The inner wall of the rear end of the feed box 2 is hinged with a second connecting rod 29. The second connecting rod 29 is covered with a sliding sleeve 30. The outer ends of the first connecting rod 28 and the second connecting rod 29 are in a hinged fit. Below the table frame 1, there is an L-shaped tilting rod 31. The upper end of the vertical part of the tilting rod 31 passes through the table frame 1 and is hinged to the sliding sleeve 30. The front end of the horizontal part of the tilting rod 31 extends upward at an angle. There is a rod seat 22 below the front end of the table frame 1. The inclined part of the tilting rod 31 is in a hinged fit with the lower end of the rod seat 22. The outer end of the inclined part of the tilting rod 31 is located below the seat cushion 32 of the spring seat. The first connecting rod 28 , the second connecting rod 29 , the sliding sleeve 30 , the tilting rod 31 and the rod seat 22 constitute the tilting rod mechanism.

[0025] The front end of the support plate 3 has a downward step 37 , and above the step 37 there is a rubbing wheel mechanism linked to the fork mechanism, which is used to deliver the blood sampling pad 9 from the discharge hole 10 of the storage box 6 through the feed hole 16 of the feed box 2 .

[0026] like Figure 1 and Figure 2 As shown, in this embodiment, the rubbing wheel mechanism includes two horizontally arranged and vertically parallel rotating shafts 11. Both ends of the rotating shafts 11 are rotatably engaged with the side walls of the two feeding boxes. A large gear 12 and a rubbing wheel 13 are provided on each of the two rotating shafts 11. The two large gears 12 are meshed with each other. The two rubbing wheels 13 correspond to each other in the vertical direction and have a gap between them. This gap corresponds to the position of the discharge hole 10 of the storage box 6. The large gear 12 on the lower rotating shaft 11 is concentrically connected to a small gear 15. The front end of the slider 5 of the shift fork mechanism is connected to a horizontally arranged rack 14. This rack 14 passes through the vertical wall of the step 37 at the front end of the support plate 3 and meshes with the small gear 15.

[0027] like Figure 1 As shown, the upper surface of the recovery box 18 has an opening, and flaps 17 are hingedly connected to the front and rear edges of the opening. A horizontally arranged push plate 20 is installed in the recovery box 18. First compression springs 21 are evenly distributed between the push plate 20 and the bottom of the recovery box 18. A traction mechanism is connected to the bottom of the push plate 20. This traction mechanism is connected to the tilting lever mechanism so that it can cooperate with the shift fork mechanism in a coordinated manner. The upper surface of the recovery box 18 is no higher than the lower edge of the feeding hole 16 of the feeding box 2.

[0028] In this embodiment, the push plate 20 is rectangular and has through-holes at each of its four corners. Vertical guide rods 19 are located at each of the four corners of the recovery box 18, and the through-holes at the four corners of the push plate 20 fit over the corresponding guide rods 19. At least three pull ropes 23 are evenly connected to the middle of the lower surface of the push plate 20. The lower ends of the pull ropes 23 converge and are connected to an elastic loop 24. A traction rope 25 is connected to the elastic loop 24. The traction rope 25 extends vertically downward and connects to the horizontal portion of the tilting lever 31. These pull ropes 23, elastic loop 24, and traction rope 25 constitute the traction mechanism.

[0029] Before use, the sterile blood sampling pads 9 are stacked together and placed in the storage box 6. When the patient needs to have blood drawn, he must sit on the spring seat. The seat cushion 32 presses down the front end of the tilting lever mechanism (i.e., the outer end of the inclined portion of the tilting lever 31). The tilting lever 31 rotates along its hinge point with the rod seat 22 below the table frame 1, and the rear end of the tilting lever 31 tilts upward as a whole. At this time, the traction rope 25 in the traction mechanism connected to the horizontal portion of the tilting lever 31 is released, causing the push plate 20 of the recovery box 18 to rise under the action of the first compression spring 21, pushing the flap 17 of the opening of the recovery box 18 to close horizontally. At the same time, the rear end of the lever 31 tilts up, i.e., the vertical portion of the lever 31 rises. Under the action of the sleeve 30, the second connecting rod 29 rotates counterclockwise about its hinge point with the inner wall of the feed box 2. The angle between the second connecting rod 29 and the first connecting rod 28 increases, and the first connecting rod 28 pushes the slider 5 in the shift fork mechanism forward, driving the shift fork 27 to pull the blood sampling pad 9 at the bottom layer of the storage box 6 out of the discharge hole 10. At this time, the rack 14 on the slider 5 in the shift fork mechanism moves forward, driving the meshed pinion 15 in the rubbing wheel mechanism to rotate. The pinion 15 then drives the large gear 12 and rubbing wheel 13 to rotate. Because the outer peripheral travel of the large gear 12 and rubbing wheel 13 is greater than that of the pinion 15 at the same rotation angle, when the front end of the blood sampling pad 9 enters between the two rubbing wheels 13, the rubbing wheel 13 can quickly deliver the blood sampling pad 9 through the feed hole 16 of the feed box 2 and onto the flap 17 of the recovery box 18. At this time, the patient can place his arm on the blood sampling pad 9 to draw blood. After the blood collection is completed, the patient stands up and leaves, the cushion 32 of the spring seat is reset, the tilting rod mechanism is also reset, the rear end of the tilting rod 31 falls, the traction rope 25 in the traction mechanism is tightened, the push plate 20 of the recycling box 18 is lowered, the flap 17 of the opening of the recycling box 18 is opened, and the used blood sampling pad 9 will fall into the recycling box 18. At the same time, the rear end of the tilting rod 31 falls, which also drives the slider 5 in the fork mechanism to slide backward and reset. It can be seen from this that the mechanical automatic replacement of blood sampling pads for blood collection of the present invention can drive its mechanical structure to automatically complete the replacement and recycling of blood sampling pads only through the patient's sitting down and standing up actions. It does not require electric drive and there is no start-stop action of any electrical components. It can not only avoid energy consumption, but also is not easy to damage and is easy to repair and maintain. It can greatly reduce the cost of use and reduce the burden on hospitals and patients.

Claims

1. A mechanical blood collection pad automatic replacement workbench for blood collection, characterized in that The invention comprises a table frame (1), wherein a feeding box (2) and a recycling box (18) are sequentially arranged on the table frame (1) from the back to the front; a support plate (3) is provided in the feeding box (2), and a storage box (6) for storing a blood collection pad is provided above the support plate (3); a front end bottom of the storage box (6) is provided with a horizontally arranged long strip discharge hole (10), and a feeding hole (16) is provided on the front end side wall of the feeding box (2) corresponding to the discharge hole (10); a long strip shifting hole (26) is provided at the bottom of the storage box (6) and arranged longitudinally along the table frame (1), and a clearance hole is provided on the support plate (3) corresponding to the shifting hole (26); a shift fork mechanism is provided below the support plate (3), and the upper end of the shift fork (27) of the shift fork mechanism extends into the storage box (6) ) in the shifting hole (26) of the feeding box (2), a tilting rod mechanism is connected below the shifting fork mechanism, and the tilting rod mechanism can push the shifting fork mechanism to slide longitudinally along the table frame (1); the shifting fork mechanism includes a slider (5), and a slide bar (4) is arranged longitudinally along the table frame (1) below the support plate (3), and the slider (5) is located on the slide bar (4) and the two are in sliding cooperation; the shifting fork (27) is fixed to the upper surface of the slider (5); the lower part of the slider (5) is hinged with a first connecting rod (28), and the inner side wall of the rear end of the feeding box (2) is hinged with a second connecting rod (29), and the second connecting rod (29) is covered with a sliding sleeve (30), and the outer ends of the first connecting rod (28) and the second connecting rod (29) are hinged; the table frame (1) An L-shaped tilting rod (31) is provided at the bottom, the upper end of the vertical portion of the tilting rod (31) passes through the table frame (1) and is hingedly engaged with the sliding sleeve (30), the front end of the horizontal portion of the tilting rod (31) is tilted and extends upward, a rod seat (22) is provided below the front end of the table frame (1), the inclined portion of the tilting rod (31) is hingedly engaged with the lower end of the rod seat (22); a spring seat is provided in front of the table frame (1), the outer end of the inclined portion of the tilting rod (31) is located below the seat cushion (32) of the spring seat; the first connecting rod (28), the second connecting rod (29), the sliding sleeve (30), the tilting rod (31) and the rod seat (22) constitute the tilting rod mechanism; the front end of the support plate (3) is provided with a downward step (37), the step (37) is provided with a downward step (37) There is a rubbing wheel mechanism on the top that is linked to the fork mechanism, and the rubbing wheel mechanism is used to send the blood sampling pad coming out of the discharge hole (10) of the storage box (6) through the feed hole (16) of the feed box (2); the upper surface of the recovery box (18) is provided with an opening, and the front and rear edges of the opening are hinged with a flap (17); a horizontally arranged push plate (20) is provided in the recovery box (18), and a first compression spring (21) is evenly distributed between the push plate (20) and the bottom of the recovery box (18), and a traction mechanism is connected to the bottom of the push plate (20), and the traction mechanism is connected to the tilting rod mechanism so that it can be linked with the fork mechanism, and the upper surface of the recovery box (18) is not higher than the lower edge of the feed hole (16) of the feed box (2);The middle part of the lower surface of the push plate (20) is evenly connected to no less than three pull ropes (23), the lower ends of the pull ropes (23) are gathered together and connected to an elastic ring (24), and the elastic ring (24) is connected to a traction rope (25), and the traction rope (25) is vertically downward and connected to the horizontal part of the tilting rod (31); the pull rope (23), the elastic ring (24) and the traction rope (25) constitute the traction mechanism; the front end of the tilting rod mechanism extends from the bottom of the table frame (1) and is located below the seat cushion (32) of the spring seat; the spring seat presses the front end of the tilting rod mechanism downward, and the tilting rod (31) rotates along the hinge point between it and the rod seat (22) below the table frame (1), thereby driving the traction mechanism to release and return to the horizontal closed state of the two flaps (17), and at the same time, the fork mechanism slides to push the blood sampling pad to move, and then the rubbing wheel mechanism feeds the blood sampling pad to the top of the flap (17).

2. The blood collection pad mechanical automatic replacement workbench according to claim 1, characterized in that The upper end of the material storage box (6) is open, and an elastic pressure plate (7) is provided therein.

3. The mechanical automatic blood collection pad replacement workbench for blood collection according to claim 2, characterized in that The outer shell of the elastic pressure plate (7) is made of elastic material, and springs are evenly distributed therein. A weight block (8) is fixed on the upper part of the elastic pressure plate (7).

4. The blood collection pad mechanical automatic replacement workbench according to claim 1, characterized in that The rubbing wheel mechanism comprises two horizontally arranged and vertically parallel rotating shafts (11), both ends of the rotating shafts (11) are rotatably matched with the two side walls of the two feeding boxes; a large gear (12) and a rubbing wheel (13) are provided on the two rotating shafts (11), the two large gears (12) are meshed with each other, the two rubbing wheels (13) correspond to each other and there is a gap between them, and the gap corresponds to the position of the discharge hole (10) of the storage box (6); the large gear (12) on the lower rotating shaft (11) is concentrically connected to a small gear (15), and the front end of the fork mechanism is connected to a horizontally arranged rack (14), and the rack (14) passes through the vertical wall of the front step (37) of the support plate (3) and meshes with the small gear (15).

5. The mechanical automatic blood collection pad replacement workbench for blood collection according to claim 1, characterized in that The push plate (20) is rectangular and has through holes at its four corners. The four corners of the recovery box (18) are provided with vertically arranged guide rods (19), and the through holes at the four corners of the push plate (20) are sleeved on the corresponding guide rods (19).

6. The mechanical automatic blood collection pad replacement workbench for blood collection according to claim 1, characterized in that The spring seat comprises a base (36), a vertically arranged sleeve (34) is fixed on the base (36), a vertically arranged insertion rod (33) is fixed below the seat cushion (32), and the lower end of the insertion rod (33) is inserted into the sleeve (34) of the base (36); the sleeve (34) is covered with a second compression spring (35), and the upper end of the second compression spring (35) extends to the bottom of the seat cushion (32).

Images