Medical instrument cleaning equipment
By designing medical device cleaning equipment for conveying pipes, spray heads, motors, quick connection devices and mobile devices, the problems of poor cleaning effects and complex operation of existing equipment are solved, efficient cleaning and flexible movement are achieved, and medical devices are ensured. Clean and safe.
Patent Information
- Application Number
- CN202420805312.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-18
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-04-18
AI Technical Summary
The existing medical device cleaning equipment has a simple structure and a single cleaning function, which cannot effectively remove stubborn stains and bacteria. The pipe connection is complicated, the operation is complicated, the equipment is inflexible, and the sealing is poor, which affects the cleaning effect and operation convenience.
A medical device cleaning equipment including conveying pipes, spray heads, motors, quick connection devices and mobile devices is designed. Preliminary and powerful cleaning is achieved through the conveying assembly, quick connection devices realize pipes quickly and seal, and mobile devices realize equipment. Flexible movement and fixation.
Effectively remove stubborn stains and bacteria from medical devices, simplify pipe connection operations, improve equipment mobility and efficiency, and ensure cleanliness and safety.
Smart Images
Figure CN222175118U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical equipment maintenance, and more specifically, to a medical equipment cleaning device. Background Art
[0002] In the medical industry, cleaning of medical devices is a key link in ensuring medical safety and reducing infection risks. However, existing medical device cleaning equipment still has some deficiencies in structural design and functional implementation, which affects the cleaning effect and operational convenience.
[0003] First of all, the existing medical device cleaning equipment is usually simple in structure and has a single cleaning function. It often only uses a simple flushing method, which may not be able to effectively remove stubborn stains, blood stains, and bacteria on medical devices, resulting in poor cleaning effects. Incompletely cleaned medical devices may have residual harmful substances, increasing the risk of infection for patients and affecting medical safety and treatment effects.
[0004] Secondly, there are some problems with the connection of pipelines in the existing technical means. The pipeline connection methods in some cleaning equipment are relatively cumbersome and require complicated operating steps and special tools, which not only increases the difficulty of operation, but also prolongs the cleaning preparation time. At the same time, the existing pipeline connection methods may not be able to achieve rapid disassembly and assembly, resulting in time-consuming equipment maintenance and cleaning. In addition, some connection methods have poor sealing properties, which may cause liquid leakage during the cleaning process, which not only wastes cleaning agents but also may pollute the working environment.
[0005] In addition, existing medical device cleaning equipment usually adopts a fixed cabinet structure. This design limits the flexibility and mobility of the equipment. In a medical environment, cleaning equipment may need to be used in different locations, such as an operating room, a disinfection room, or a supply room. The fixed structure makes it very inconvenient to move the equipment when it needs to be moved, increasing the labor intensity and time cost of transportation. Utility Model Content
[0006] 1. Technical issues to be solved
[0007] In view of the problems existing in the prior art, the utility model provides a medical device cleaning device to solve the technical problems mentioned in the background technology.
[0008] (II) Technical solution
[0009] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a medical device cleaning equipment, including a cleaning box, a box door is provided on one side of the cleaning box, a cleaning device is arranged in the cleaning box, the cleaning device includes a conveying pipe, a support block, a motor, a connecting shaft, blades, a through hole and a cleaning chamber, the support block is arranged inside the cleaning box, the cleaning chamber is installed on the support block, the through hole is opened on the side wall and the bottom end of the cleaning chamber, the conveying pipe is arranged at the top end of the cleaning box, the motor is installed at the bottom end of the cleaning box, the connecting shaft is arranged in the cleaning box, and the bottom end of the connecting shaft is connected to the output end of the motor, the blade is arranged on the side wall of the connecting shaft, one end of the conveying pipe is connected to a quick-connect device, and the quick-connect device The device includes a clamping tube, a movable sleeve, a first spring, an elastic plate, a clamping frame, a clamping groove, a connecting tube, an unlocking groove, an unlocking block and a sealing gasket, wherein the connecting tube is installed at the top of the cleaning box, the clamping tube is detachably installed in the connecting tube, the movable sleeve is movably installed on the outside of the connecting tube, the two ends of the elastic plate are respectively connected to the corresponding movable sleeves, the first spring is movably arranged on the inner side of the elastic plate, the clamping frame is engaged with the clamping groove, the clamping groove is arranged on the outside of the clamping tube, the unlocking groove is arranged on the inside of the movable sleeve, the unlocking blocks are arranged on both sides of the clamping frame, and the unlocking blocks are slidably installed in the unlocking sleeve, the sealing gasket is detachably installed inside the connecting tube, and a moving device is arranged on the outside of the cleaning box.
[0010] The utility model is further configured as follows: a conveying assembly is provided on one side of the cleaning box, an output end of the conveying assembly is connected to a conveying pipe, an output pipe is provided at the output end of the conveying assembly, and the other end of the output pipe is connected to the bottom end of the cleaning box.
[0011] The utility model is further configured that a spray head is provided at the top of the interior of the cleaning box, and an input end of the spray head is communicated with a bottom end of a connecting pipe.
[0012] The utility model is further configured as follows: a slider is provided on the inner side of the unlocking block, a sliding groove is correspondingly provided on the side wall of the connecting tube, the slider is slidably installed in the sliding groove, a second spring is provided in the sliding groove, one end of the second spring is connected to the slider, and the configuration of the above components can realize the stable movement and resetting of the unlocking block, making the use of the quick connecting device more stable.
[0013] The utility model is further configured that a groove is provided on the inner side of the connecting pipe, and a rubber ring is provided on the outer side of the clamping pipe. The configuration of the groove and the rubber ring further enhances the sealing performance of the pipeline connection.
[0014] The utility model is further configured as follows: the mobile device includes a frame, a push handle and universal wheels, the cleaning box and the conveying assembly are both installed on the frame, the push handle is fixedly installed on one side of the frame, and the universal wheels are detachably installed at the four corners of the bottom end of the frame. The configuration of the mobile device can realize flexible movement of the equipment.
[0015] The utility model is further configured that brake blocks are provided on both sides of the frame, and a limiting rod is provided on the top of the brake block. The limiting rod can be movably installed on both sides of the frame. The configuration of the brake blocks and the limiting rod can stop the equipment.
[0016] The utility model is further configured as follows: a push spring is sleeved on the outer side of the limit rod, the top end of the push spring is connected to the bottom end of the frame, the bottom end of the push spring is connected to the top end of the brake block, a limit frame is provided on the frame, the limit frame can be movably installed at a corresponding position on the frame, a lap block is provided on the frame, one end of the limit frame is overlapped onto the top of the lap block, and the arrangement of the above components can ensure the stable fixation of the equipment and prevent it from moving easily.
[0017] (III) Beneficial effects
[0018] Compared with the prior art, the utility model provides a medical device cleaning device having the following
[0019] Beneficial effects:
[0020] 1. The cleaning device adopts the design of delivery pipe, spray head and motor and other components to achieve the initial flushing and strong cleaning of medical devices. This design delivers the cleaning liquid to the spray head through the delivery assembly to achieve the initial flushing of the medical devices. Subsequently, the motor drives the blades to rotate through the connecting shaft to stir the cleaning liquid in the cleaning box to achieve strong cleaning of the medical devices. The design of the cleaning device can effectively remove stubborn stains, blood and bacteria on medical devices, improve the cleaning effect, and ensure the cleanliness and safety of medical devices.
[0021] 2. The quick-connect device adopts a design of multiple components such as a clamping tube, a movable sleeve, a clamping frame and a sealing gasket to achieve quick connection and reliable sealing of the pipeline. This design realizes the rapid engagement and release of the clamping frame through the cooperation of the elastic plate and the first spring. When connecting, you only need to loosen the elastic plate, and the clamping frame can automatically snap into the clamping groove, and through the cooperation of the sealing gasket and the rubber ring, a reliable seal is achieved at the connection. The design of the quick-connect device greatly simplifies the operating steps of pipeline connection, improves the connection efficiency, and ensures the reliability and sealing of the connection.
[0022] 3. The mobile device adopts the design of components such as a frame, a push handle and universal wheels to achieve flexible movement and fixation of the equipment. This design, through the cooperation of universal wheels and push handles, allows the equipment to be flexibly moved between different locations, improving the applicability and efficiency of the equipment. At the same time, through the setting of brake blocks and limit rods, the equipment can be quickly fixed and positioned. The design of the mobile device makes the equipment very convenient when it needs to be moved, while maintaining stability and reliability during use. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 This is a schematic diagram of the overall structure of a medical device cleaning device in the utility model;
[0024] Figure 2 It is a schematic diagram of the overall structure of the second viewing angle in the utility model;
[0025] Figure 3 It is a cross-sectional structural diagram of the cleaning device part in the utility model;
[0026] Figure 4 It is a structural schematic diagram of the quick-connect device part of the utility model;
[0027] Figure 5 It is a schematic cross-sectional structure diagram of the quick-connect device part of the utility model.
[0028] In the figure: 1. cleaning box; 2. box door; 3. conveying pipe; 4. supporting block; 5. motor; 6. connecting shaft; 7. blade; 8. through hole; 9. cleaning chamber; 10. clamping tube; 11. movable sleeve; 12. first spring; 13. elastic plate; 14. clamping frame; 15. clamping groove; 16. connecting pipe; 17. unlocking groove; 18. unlocking block; 19. sealing gasket; 20. conveying assembly; 21. output pipe; 22. sprinkler head; 23. slider; 24. slide groove; 25. second spring; 26. groove; 27. rubber ring; 28. frame; 29. push handle; 30. universal wheel; 31. brake block; 32. limit rod; 33. push spring; 34. limit frame; 35. overlap block. DETAILED DESCRIPTION
[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0030] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.
[0031] In the present invention, unless otherwise specified, directions such as "up" and "down" are usually used in reference to the directions shown in the drawings, or in reference to the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "left" and "right" are usually used in reference to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.
[0032] See also Figure 1-5A medical device cleaning device comprises a cleaning box 1, a box door 2 is provided on one side of the cleaning box 1, a cleaning device is arranged in the cleaning box 1, the cleaning device comprises a conveying pipe 3, a support block 4, a motor 5, a connecting shaft 6, a blade 7, a through hole 8 and a cleaning chamber 9, the support block 4 is arranged inside the cleaning box 1, the cleaning chamber 9 is installed on the support block 4, the through hole 8 is opened on the side wall and the bottom end of the cleaning chamber 9, the conveying pipe 3 is arranged at the top of the cleaning box 1, the motor 5 is installed at the bottom end of the cleaning box 1, the connecting shaft 6 is arranged in the cleaning box 1, and the bottom end of the connecting shaft 6 is connected to the output end of the motor 5, the blade 7 is arranged on the side wall of the connecting shaft 6, and one end of the conveying pipe 3 is connected with a quick connection device, and the quick connection device comprises a clamping tube 10, a movable sleeve 11, a first spring 12, an elastic plate 13, a clamp The connecting frame 14, the card slot 15, the connecting pipe 16, the unlocking slot 17, the unlocking block 18 and the sealing gasket 19, the connecting pipe 16 is installed at the top of the cleaning box 1, the card tube 10 is detachably installed in the connecting pipe 16, the movable sleeve 11 is arranged on the outside of the connecting pipe 16, the two ends of the elastic plate 13 are respectively connected with the corresponding movable sleeves 11, the first spring 12 is movably arranged on the inner side of the elastic plate 13, the card frame 14 is engaged with the card slot 15, the card slot 15 is opened on the outside of the card tube 10, the unlocking slot 17 is opened on the inner side of the movable sleeve 11, the unlocking blocks 18 are arranged on both sides of the card frame 14, and the unlocking blocks 18 are slidably installed in the unlocking sleeve, the sealing gasket 19 is detachably installed inside the connecting pipe 16, and a moving device is arranged on the outside of the cleaning box 1.
[0033] A conveying assembly 20 is provided on one side of the cleaning box 1 , and the output end of the conveying assembly 20 is connected to the conveying pipe 3 . An output pipe 21 is provided on the output end of the conveying assembly 20 , and the other end of the output pipe 21 is connected to the bottom end of the cleaning box 1 .
[0034] A spray head 22 is provided at the top of the cleaning box 1 , and an input end of the spray head 22 is connected to the bottom end of the connecting pipe 16 .
[0035] A slider 23 is provided inside the unlocking block 18 , and a slide groove 24 is correspondingly provided on the side wall of the connecting pipe 16 . The slider 23 is slidably installed in the slide groove 24 . A second spring 25 is provided in the slide groove 24 , and one end of the second spring 25 is connected to the slider 23 .
[0036] A groove 26 is formed on the inner side of the connecting tube 16 , and a rubber ring 27 is formed on the outer side of the clamping tube 10 .
[0037] In this embodiment, when the medical device needs to be cleaned, the elastic plates 13 on both sides are first pulled, and the elastic plates 13 will compress the first spring 12 in the middle, and then the elastic plates 13 will drive the movable sleeves 11 connected on both sides to move, and the slider 23 and the slide groove 24 will limit and guide the movable sleeve 11, and the slider 23 will slide in the slide groove 24 and compress the second spring 25 set in the slide groove 24. Due to the special structural design of the unlocking groove 17 and the unlocking block 18, when the movable sleeves 11 on both sides move relatively inward, , the card frame 14 will move relatively outward, when the elastic plate 13 can no longer be pulled, one end of the card frame 14 is just flush with the inner wall of the connecting tube 16, and then the card tube 10 is inserted into the connecting tube 16, and one end of the card tube 10 is against the sealing gasket 19 set on the inner side of the connecting tube 16, and then the elastic plate 13 is released, the first spring 12 and the elastic plate 13 will reset, the second spring 25 will push the slider 23 to reset in the slide groove 24, and then the movable sleeve 11 will drive the unlocking block 18 to reset, so that one end of the card frame 14 is locked The clamping frame 14 is completely engaged in the clamping groove 15. Due to the special structural design inside the clamping groove 15, when the clamping frame 14 is completely engaged in the clamping groove 15, the clamping tube 10 will compress the sealing gasket 19, and the rubber ring 27 arranged on the outer side of the clamping tube 10 will also be engaged in the corresponding groove 26, so as to achieve the rapid connection of the pipeline and ensure the high sealing of the connection. Then, the box door 2 is opened, and the medical device to be cleaned is placed in the cleaning chamber 9. Then, the box door 2 is closed, and the conveying assembly 20 is opened, so that the conveying assembly 20 can transfer the cleaning liquid. The liquid is transported to the spray head 22 through the delivery pipe 3 and sprayed into the cleaning chamber 9 through the spray head 22 to achieve preliminary flushing of the medical device. When the liquid surface in the cleaning chamber 1 accumulates to a certain height and covers the medical device, the delivery assembly 20 can be closed, and then all the motors 5 can be turned on. The motor 5 drives the blades 7 to rotate through the connecting shaft 6 connected to the output end, thereby stirring the cleaning liquid accumulated in the cleaning chamber 1, thereby strongly cleaning the medical device in the cleaning chamber 9. After cleaning, the cleaning liquid in the cleaning chamber 1 can be completely discharged through the output pipe 21.
[0038] See also Figure 1-2 As an implementation method of a mobile device for cleaning medical equipment: the mobile device includes a frame 28, a push handle 29 and universal wheels 30, the cleaning box 1 and the conveying assembly 20 are both installed on the frame 28, the push handle 29 is fixedly installed on one side of the frame 28, and the universal wheels 30 are detachably installed at the four corners of the bottom end of the frame 28.
[0039] Brake blocks 31 are provided on both sides of the frame 28 , and limiting rods 32 are provided on the tops of the brake blocks 31 . The limiting rods 32 can be movably installed on both sides of the frame 28 .
[0040] A push spring 33 is sleeved on the outer side of the limit rod 32, the top end of the push spring 33 is connected to the bottom end of the frame 28, and the bottom end of the push spring 33 is connected to the top of the brake block 31. A limit frame 34 is provided on the frame 28, and the limit frame 34 can be movably installed at a corresponding position on the frame 28. A lap block 35 is provided on the frame 28, and one end of the limit frame 34 is overlapped to the top of the lap block 35.
[0041] More specifically, when the equipment needs to be moved, the limit frames 34 are first pulled open, and then the limit rod 32 is lifted upward, and at the same time, the brake block 31 will compress the push spring 33. When the top end of the limit rod 32 set on the lower end face of the card plate passes the upper end face of the overlapping block 35, the limit frame 34 is pushed back to its original position, so that one end of the limit frame 34 is re-overlapped to the top end of the overlapping block 35, and then the limit rod 32 is released, and the card plate set on the top end of the limit rod 32 will be stuck by the limit frame 34, and then the frame 28 is pushed by the push handle 29, so that the frame 28 moves through the universal wheel 30 set at the bottom. When it moves to the specified position, the limit frame 34 is pulled open again, and the push spring 33 will drive the brake block 31 and the limit rod 32 to reset, thereby fixing the equipment in place.
[0042] In summary, when the overall device is in use or in operation: when the medical device needs to be cleaned, first pull the elastic plates 13 on both sides, the elastic plates 13 will compress the first spring 12 in the middle, and then the elastic plates 13 will drive the movable sleeves 11 connected on both sides to move, the slider 23 and the slide groove 24 will limit and guide the movable sleeve 11, and the slider 23 will slide in the slide groove 24 and compress the second spring 25 set in the slide groove 24. Due to the special structural design of the unlocking groove 17 and the unlocking block 18, when the movable sleeves 11 on both sides are relatively moved, When the inner side moves, the card frame 14 will move relatively to the outer side. When the elastic plate 13 can no longer be pulled, one end of the card frame 14 is just flush with the inner wall of the connecting tube 16, and then the card tube 10 is inserted into the connecting tube 16, and one end of the card tube 10 is against the sealing gasket 19 set on the inner side of the connecting tube 16, and then the elastic plate 13 is released, the first spring 12 and the elastic plate 13 will reset, the second spring 25 will push the slider 23 to reset in the slide groove 24, and then the movable sleeve 11 will drive the unlocking block 18 to reset, so that the card frame One end of the clamping frame 14 is engaged with the clamping groove 15. Due to the special structural design inside the clamping groove 15, when the clamping frame 14 is fully engaged with the clamping groove 15, the clamping tube 10 will compress the sealing gasket 19, and the rubber ring 27 arranged on the outer side of the clamping tube 10 will also be engaged with the corresponding groove 26, so as to achieve the rapid connection of the pipeline and ensure the high sealing of the connection. Then, the box door 2 is opened, and the medical device to be cleaned is placed in the cleaning chamber 9. Then, the box door 2 is closed, and the conveying assembly 20 is opened, so that the conveying assembly 20 is The cleaning liquid is transported to the spray head 22 through the delivery pipe 3, and is sprayed into the cleaning chamber 9 through the spray head 22 to achieve preliminary flushing of the medical equipment. When the liquid surface in the cleaning box 1 accumulates to a certain height and covers the medical equipment, the delivery assembly 20 can be closed, and then all the motors 5 can be turned on. The motor 5 drives the blades 7 to rotate through the connecting shaft 6 connected to the output end, thereby stirring the cleaning liquid accumulated in the cleaning box 1, thereby strongly cleaning the medical equipment in the cleaning chamber 9. After cleaning, the cleaning liquid in the cleaning box 1 can be completely discharged through the output pipe 21.
[0043] When the device needs to be moved, first pull out the limit frames 34, then lift the limit rod 32 upward, and at the same time the brake block 31 will compress the push spring 33. When the top end of the limit rod 32 set at the lower end face of the card plate passes the upper end face of the lap block 35, push the limit frame 34 back to its original position so that one end of the limit frame 34 is re-lapped to the top end of the lap block 35, and then release the limit rod 32, the card plate set at the top end of the limit rod 32 will be stuck by the limit frame 34, and then push the frame 28 through the push handle 29, so that the frame 28 moves through the universal wheel 30 set at the bottom. When it moves to the specified position, pull out the limit frame 34 again, and the push spring 33 will drive the brake block 31 and the limit rod 32 to reset, thereby fixing the device in place.
[0044] In all the schemes mentioned above, the connection between two parts can be selected according to actual conditions by welding, bolt and nut matching connection, bolt or screw connection or other well-known connection methods, which are not described here one by one. In the above, all fixed connections are preferably welded. Although the embodiments of the utility model have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the utility model. The scope of the utility model is defined by the attached claims and their equivalents.
Claims
1. A medical device cleaning device, comprising a cleaning box (1), wherein one side of the cleaning box (1) is provided with a box door (2), wherein: The cleaning box (1) is provided with a cleaning device, and the cleaning device comprises a conveying pipe (3), a support block (4), a motor (5), a connecting shaft (6), a blade (7), a through hole (8) and a cleaning chamber (9). The support block (4) is arranged inside the cleaning box (1), the through hole (8) is opened on the side wall of the cleaning chamber (9), the bottom end of the connecting shaft (6) is connected to the motor (5), the blade (7) is arranged on the side wall of the connecting shaft (6), one end of the conveying pipe (3) is connected to a quick-connect device, and the quick-connect device comprises a clamping pipe (10), a movable sleeve (11), a first spring (12), an elastic The invention relates to a plate (13), a clamping frame (14), a clamping groove (15), a connecting pipe (16), an unlocking groove (17), an unlocking block (18) and a sealing gasket (19); the two ends of the elastic plate (13) are connected to the corresponding movable sleeve (11); the first spring (12) is arranged on the inner side of the elastic plate (13); the clamping frame (14) is clamped with the clamping groove (15); the unlocking groove (17) is arranged on the inner side of the movable sleeve (11); the unlocking block (18) is arranged on both sides of the clamping frame (14); the sealing gasket (19) is installed inside the connecting pipe (16); and a moving device is arranged on the outer side of the cleaning box (1).
2. A medical device cleaning device according to claim 1, characterized in that: A conveying assembly (20) is provided on one side of the cleaning box (1), the output end of the conveying assembly (20) is connected to the conveying pipe (3), the output end of the conveying assembly (20) is provided with an output pipe (21), and the other end of the output pipe (21) is connected to the bottom end of the cleaning box (1).
3. A medical device cleaning device according to claim 2, characterized in that: A spray head (22) is provided at the top of the cleaning box (1), and an input end of the spray head (22) is connected to the bottom end of the connecting pipe (16).
4. The medical device cleaning device according to claim 1, characterized in that: A slider (23) is provided on the inner side of the unlocking block (18), and a slide groove (24) is correspondingly provided on the side wall of the connecting tube (16). The slider (23) is slidably installed in the slide groove (24), and a second spring (25) is provided in the slide groove (24), and one end of the second spring (25) is connected to the slider (23).
5. A medical device cleaning device according to claim 4, characterized in that: A groove (26) is provided on the inner side of the connecting pipe (16), and a rubber ring (27) is provided on the outer side of the clamping pipe (10).
6. A medical device cleaning device according to any one of claims 1 to 5, characterized in that: The mobile device comprises a frame (28), a push handle (29) and universal wheels (30); the cleaning box (1) and the conveying assembly (20) are both mounted on the frame (28); the push handle (29) is fixedly mounted on one side of the frame (28); and the universal wheels (30) are detachably mounted at the four corners of the bottom end of the frame (28).
7. A medical device cleaning device according to claim 6, characterized in that: Brake blocks (31) are provided on both sides of the vehicle frame (28), and a limiting rod (32) is provided on the top of the brake block (31). The limiting rod (32) can be movably installed on both sides of the vehicle frame (28).
8. A medical device cleaning device according to claim 7, characterized in that: A push spring (33) is sleeved on the outer side of the limit rod (32), the top end of the push spring (33) is connected to the bottom end of the frame (28), and the bottom end of the push spring (33) is connected to the top end of the brake block (31). A limit frame (34) is provided on the frame (28), and the limit frame (34) can be movably installed at a corresponding position on the frame (28). A lap block (35) is provided on the frame (28), and one end of the limit frame (34) is lapped above the lap block (35).