High-rise building rescue fire truck

Abstract

The present invention discloses a high-rise building rescue fire-fighting vehicle, characterized in that a guide cable mechanism (1) is fixedly installed on the top wall (6) of the building (5), a fixed pulley (35) is fixedly installed under the wall (6), and a cable moving mechanism (3) is installed on the vehicle (11), and a moving mechanism (2) is installed inside the vehicle. The present invention adopts a thrower or an unmanned aerial vehicle to throw a ball connected to a small rope. No matter where the ball is thrown on the roof, the small rope can be pulled by the rope pulley (39) to be pulled around the two ends of the fixed pulley (35) through the guide cable mechanism (1). The small rope is loosened, and the small ball against the wall slides to the ground under the action of gravity and is connected to the large rope by ground personnel. The small rope pulls the large rope, and the large rope pulls the steel wire rope. The hanging basket is fixed on the steel wire rope and can move left and right. As the steel wire rope reciprocates and is loosened and tightened, the rescue fire-fighting operation on the selected floor can be realized. After the operation is completed, the steel wire rope pulls the large rope, and the large rope pulls the small rope for recovery.

Description

Technical Field

[0001] The invention belongs to the field of mechanical technology, and in particular relates to a high-rise building rescue fire truck. Background Art

[0002] With the rapid development of social economy, more and more people live and work in high-rise buildings. Although various high-rise buildings are equipped with safety passages, when fires and other dangerous situations occur, only some people can escape smoothly through the safety passages, while the rest are trapped in the high-rise buildings. The existing fire climbing vehicles have certain limitations in their height and are expensive. The prior art publication number; CN201040150Y, a high-rise building emergency escape and rescue device, because the lightweight traction rope is installed on the outer wall of the roof, the lightweight traction rope is corroded by wind and rain, easy to break, and difficult to maintain. In addition, the lightweight traction rope is not beautiful when hung on the outer wall, and the hanging basket cannot move left and right. A steel wire rope has poor stability and is unsafe. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a high-rise building rescue fire-fighting vehicle which is not restricted by the height of the floor and can be quickly ascended to any working floor by rescue personnel to help the rescued people escape and carry out fire-fighting operations. The vehicle has low cost, is easy to maintain, has good stability and safety, and can improve the success rate of operations.

[0004] The purpose of the present invention and the solution of its main technical problems are achieved by adopting the following technical solutions:

[0005] A high-rise building rescue fire-fighting vehicle of the present invention is characterized in that a guide rope mechanism is fixedly installed on a wall above a building, a side surface is fixedly connected to an upper end of a cable moving mechanism, a lower end of the cable moving mechanism is installed on the vehicle, a moving mechanism is installed in the middle of the cable moving mechanism, the guide rope mechanism consists of a cable groove A, a conduit A, a cable groove B, a conduit B, a guide rope piece A, a guide rope piece B, a guide rope piece C, a column, a cover plate, a ball guide groove, a bottom plate, and an entrance, the top ends of the conduit A and the conduit B are fixedly connected to the guide rope piece A, the guide rope piece B, and the guide rope piece C, one end of the conduit A and the conduit B is connected to the entrance arranged on the ball guide groove, the ball guide groove is connected to the cover plate above and the bottom plate below, the conduit A and the conduit B are respectively provided with a cable groove A and a cable groove B, the cable groove A and the cable groove B correspond to the gaps between the guide rope pieces A, the guide rope piece B, and the guide rope piece C, the conduit A and the conduit B are installed on the wall, the bottom plate is installed on the building, and the two ends of a plurality of columns are respectively connected to the guide rope piece A, the guide rope piece B, the guide rope piece C and the wall.

[0006] The moving mechanism is composed of a motor, a slide rail A, a connector A, a threaded rod, a fire sprinkler, a screw sleeve, a connecting plate A, a connector B, a slide rail B, a positioning shaft seat B, a connecting plate B, a connecting plate C, a hanging basket, and a positioning shaft seat C. The screw sleeve is screwed into the middle of the threaded rod, and the two ends are respectively inserted into the positioning shaft seat B and the positioning shaft seat C. The positioning shaft seat B and the positioning shaft seat C are respectively sleeved on the two ends of the slide rail A and the slide rail B. One end of the slide rail A and the slide rail B is fixedly connected to the motor. The positioning shaft seat B and the positioning shaft seat C are respectively hinged to one end of the connecting plate A and the connecting plate C. The other ends of the connecting plate A and the connecting plate C are respectively hinged to the two ends of the connecting plate B. One end of the connecting plate A and the connecting plate C is respectively hinged to the base of the connecting member A and the connecting member B. The connecting member A and the connecting member B are respectively locked on the large wire rope with the connecting member. The upper and lower ends of the screw sleeve are respectively connected to the hanging basket and the fire sprinkler.

[0007] The cable moving mechanism A is composed of two mirror-mounted balls, two small ropes, two fixed pulleys, two large ropes, two steel wire ropes, two rope pulleys A, two rope pulleys B, two rope pulleys C, two rope pulleys D, two rope pulleys E, and a winch frame. The two balls are respectively connected to the two small ropes, and the two small ropes are wound around the two rope pulleys B. The upper ends of the two large ropes are respectively wound around the two fixed pulleys, and the four lower ends are respectively wound around the two rope pulleys A and the two rope pulleys B. The upper ends of the two steel wire ropes are respectively wound around the two fixed pulleys, and the four lower ends are respectively wound around the two rope pulleys D and the two rope pulleys E. The two rope pulleys A, the two rope pulleys B, the two rope pulleys C, the two rope pulleys D, and the two rope pulleys E are respectively mirror-mounted on the winch frame. The two fixed pulleys are fixedly mounted on the side of the building, and the winch frame is mounted on the vehicle.

[0008] The catheter A is a U-shaped tube, hollow inside, and provided with a U-shaped through groove outside, through which the ball can pass, and the small rope can be inserted into the catheter A through the U-shaped through groove.

[0009] The guide wire piece A, the guide wire piece B and the guide wire piece C are W-shaped on the top.

[0010] The cover plate and the ball guide groove are W-shaped, the cover plate is obliquely installed on the ball guide groove, the ball guide groove is obliquely installed on the bottom plate, and the bottom plate is obliquely installed on the building.

[0011] The positioning shaft seat B and the positioning shaft seat C can move left and right on the slide rail A, the threaded rod and the slide rail B.

[0012] The fire extinguishing nozzle, the screw sleeve and the hanging basket can move left and right on the threaded rod.

[0013] Compared with the prior art, the present invention has obvious beneficial effects; it can be seen from the above technical scheme that: a guide cable mechanism is fixedly installed on the wall above the building, the side is fixedly connected to the upper end of the cable moving mechanism, the lower end of the cable moving mechanism is installed on a vehicle, a moving mechanism is installed in the middle of the cable moving mechanism, the tops of the conduits A and B are fixedly connected to the guide cable pieces A, B and C, one end of the conduits A and B is connected to the inlet set on the guide ball groove, the ball guide groove is connected to the cover plate on the top and the bottom plate on the bottom, the conduits A and B are respectively provided with cable grooves A and B, the cable grooves A and B correspond to the gaps between the guide cable pieces A, B and C, the conduits A and B are installed on the wall, the bottom plate is installed on the building, and the two ends of a number of columns are respectively connected to the guide cable pieces A, B, C and the wall. Use a catapult or drone to move two balls and two small ropes to both sides of the building, pull the two lightweight small ropes respectively, move the two balls along the bottom plate into the ball guide groove, and then enter the ends of conduits A and B respectively through the entrance at the top of the ball guide groove. The small ropes are respectively inserted into the rope grooves A and B and move along the rope grooves A and B. The small ropes pass through the rope grooves A and B, and the two balls pass through the U-shaped conduits A and B and fall out from the other end to the ground. Then, use two lightweight small ropes to tie one end of the two large ropes respectively, pull one end of the two large ropes up and wrap them around the two fixed pulleys respectively. Pull back and fix them on two cable wheels C respectively, and then use two large cables to fix the connecting parts A and B respectively to connect the mobile mechanism to the two large cables. Two cable wheels E connect the other ends of the two large cables. The two cable wheels E rotate to drive the two large cables. The two large cables are connected with connecting parts A and B. The fire sprinkler sprays water to extinguish the fire. The hanging basket picks up and drops off personnel. The motor is connected to the battery. The motor is controlled by the remote control to rotate. The motor drives the threaded rod to rotate to make the screw sleeve move left and right. The ball and small rope are moved by the thrower or drone. The small rope pulls the large rope, and the large rope pulls the wire rope. The hanging basket can move left and right. It is not limited by the height of the floor. The rescue personnel can quickly rise to any operating floor to help the rescued personnel escape and perform fire fighting operations. It has low cost, easy maintenance, good stability, safety, and improves the success rate of operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 It is a structural schematic diagram of the cable guide mechanism of the present invention;

[0016] Figure 3 It is a left side view of the cable guide mechanism of the present invention;

[0017] Figure 4 A top view of the cable guide mechanism of the present invention;

[0018] Figure 5 for Figure 4 Sectional view of AA;

[0019] Figure 6 is a schematic diagram of the structure of the catheter of the present invention;

[0020] Figure 7 is a top view of the catheter of the present invention;

[0021] Figure 8 It is a structural schematic diagram of the ball guide groove of the present invention;

[0022] Fig. 9 It is a structural schematic diagram of the cover plate of the present invention;

[0023] Fig.10 It is a structural schematic diagram of the mobile mechanism of the present invention;

[0024] Fig.11 is a top view of the mobile mechanism of the present invention;

[0025] Fig.12 It is a left side view of the moving mechanism of the present invention;

[0026] Fig.13 It is a structural schematic diagram of the cable moving mechanism of the present invention;

[0027] Fig.14 It is a top view of the cable moving mechanism of the present invention.

[0028] Reference numerals:

[0029] 1. Cable guide mechanism, 2. Moving mechanism, 3. Cable moving mechanism, 4. Car, 5. Building, 6. Fence, 7. Cable groove A, 8. Conduit A, 9. Cable groove B, 10. Conduit B, 11. Cable guide piece A, 12. Cable guide piece B, 13. Cable guide piece C, 14. Column, 15. Cover plate, 16. Ball guide groove, 17. Bottom plate, 18. Entrance, 19. Motor, 20. Slide rail A, 21. Connector A, 22. Threaded rod, 23. Fire sprinkler, 24. Screw sleeve, 25. Connecting plate A, 26. Moving pulley B, 27. Slide rail B, 28. Positioning shaft seat B, 29. Connecting plate B, 30. Connecting plate C, 31. Hanging basket, 32. Positioning shaft seat C, 33. Ball, 34. Small rope, 35. Fixed pulley, 36. Large rope, 37. Wire rope, 38. Rope pulley A, 39. Rope pulley B, 40. Rope pulley C, 41. Rope pulley D, 42. Rope pulley E, 43. Winch frame. DETAILED DESCRIPTION

[0030] The specific implementation methods, structures, features and functions of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0031] A high-rise building rescue fire-fighting vehicle of the present invention is characterized in that a guide cable mechanism 1 is fixedly installed on a wall 6 above a building 5, the side of which is fixedly connected to the upper end of a cable moving mechanism 3, the lower end of the cable moving mechanism 3 is installed on a vehicle 4, and a moving mechanism 2 is installed in the middle of the cable moving mechanism 3. The guide cable mechanism 1 is composed of a cable groove A7, a guide tube A8, a cable groove B9, a guide tube B10, a guide cable piece A11, a guide cable piece B12, a guide cable piece C13, a column 14, a cover plate 15, a ball guide groove 16, a bottom plate 17, and an inlet 18. The top ends of the guide tubes A8 and B10 are fixedly connected to the guide cable pieces A11, B12, and C13, and one end of the guide tubes A8 and B10 is connected to the upper end of the guide cable groove 16. An entrance 18 is provided, the ball guide groove 16 is connected to the cover plate 15 on the top and to the bottom plate 17 on the bottom, the duct A8 and the duct B10 are respectively provided with a cable groove A7 and a cable groove B9, the cable groove A7 and the cable groove B9 correspond to the gaps between the cable guide pieces A11, the cable guide pieces B12 and the cable guide pieces C13, the duct A8 and the duct B10 are installed on the fence 6, the bottom plate 17 is installed on the building 5, and the two ends of the plurality of columns 14 are respectively connected to the cable guide pieces A11, the cable guide pieces B12, the cable guide pieces C13 and the fence 6.

[0032] The mobile mechanism 2 is composed of a motor 19, a slide rail A20, a connector A21, a threaded rod 22, a fire extinguishing nozzle 23, a screw sleeve 24, a connecting plate A25, a connecting piece B26, a slide rail B27, a positioning shaft seat B28, a connecting plate B29, a connecting plate C30, a hanging basket 31, and a positioning shaft seat C32. The middle part of the threaded rod 22 is screwed into the screw sleeve 24, and the two ends are respectively inserted into the positioning shaft seat B28 and the positioning shaft seat C32. The positioning shaft seat B28 and the positioning shaft seat C32 are respectively sleeved on the two ends of the slide rail A20 and the slide rail B27. 20. One end of the slide rail B27 is fixedly connected to the motor 19. The positioning shaft seat B28 and the positioning shaft seat C32 are respectively hinged to one end of the connecting plate A25 and the connecting plate C30. The other ends of the connecting plate A25 and the connecting plate C30 are respectively hinged to the two ends of the connecting plate B29. One end of the connecting plate A25 and the connecting plate C30 are respectively hinged to the base of the connecting piece A21 and the connecting piece B26. The connecting piece A21 and the connecting piece B26 are respectively locked on the large wire rope 37 with the connecting pieces. The upper and lower ends of the screw sleeve 24 are respectively connected to the hanging basket 31 and the fire sprinkler 23.

[0033] The cable transfer mechanism A3 is composed of two mirror-mounted balls 33, two small cables 34, two fixed pulleys 35, two large cables 36, two steel wire ropes 37, two cable wheels A38, two cable wheels B39, two cable wheels C40, two cable wheels D41, two cable wheels E42, and a winch frame 43. The two balls 33 are respectively connected to the two small cables 34, the two small cables 34 are wound around the two cable wheels B39, and the upper ends of the two large cables 36 are respectively wound around the two fixed pulleys 35. The lower ends are respectively wound around two rope pulleys A38 and two rope pulleys B39, the upper ends of the two steel ropes 37 are respectively wound around two fixed pulleys 35, and the four lower ends are respectively wound around two rope pulleys D41 and two rope pulleys E42, the two rope pulleys A38, two rope pulleys B39, two rope pulleys C40, two rope pulleys D41, and two rope pulleys E42 are respectively installed in a mirror-image manner on a winch frame 43, the two fixed pulleys 35 are fixedly installed on the side of the building 5, and the winch frame 43 is installed on the vehicle 4.

[0034] The conduit A8 is a U-shaped tube, hollow inside, and provided with a U-shaped through groove outside, through which the ball 33 can pass, and the small rope 34 can be inserted into the conduit A8 through the U-shaped through groove.

[0035] The guide cable piece A11, the guide cable piece B12 and the guide cable piece C13 are W-shaped on the top.

[0036] The cover plate 15 and the ball guide groove 16 are W-shaped. The cover plate 15 is installed obliquely on the ball guide groove 16 , the ball guide groove 16 is installed obliquely on the bottom plate 17 , and the bottom plate 17 is installed obliquely on the building 5 .

[0037] The positioning shaft seat B28 and the positioning shaft seat C32 can move left and right on the slide rail A20, the threaded rod 22 and the slide rail B27.

[0038] The fire extinguishing nozzle 23 , the screw sleeve 24 , and the hanging basket 31 can move left and right on the threaded rod 22 .

[0039] When in use, first use a thrower or a drone to move the two balls 33 connected to the small ropes 34 and the two small ropes 34 to both sides of the building 5, pull the two light small ropes 34, move the two balls 33 along the bottom plate 17 into the ball guide groove 16, and then enter the ends of the conduits A8 and B10 along the entrance 18 at the top of the ball guide groove 16, the small ropes 34 are respectively inserted into the rope grooves A7 and B9 and move along the rope grooves A7 and B9, the small ropes 34 pass through the rope grooves A7 and B9, the two balls 33 pass through the U-shaped conduits A8 and B10 and fall to the ground from the other end, and then use the two light small ropes 34 to tie one end of the two large ropes 36 respectively, pull one end of the two large ropes 36 up and wrap around the two fixed pulleys 35 respectively, then pull them back and fix them on the two rope wheels C40 respectively, and then use the two large ropes 36 to fix and connect the steel wire ropes 37 respectively. After the steel wire rope 37 is pulled up, it is passed around the connector A21 and the connector B26, and the mobile mechanism 1 is connected to the two steel wire ropes 37. Two cable wheels E42 are connected to the other ends of the two steel wire ropes 37. The two cable wheels E42 rotate to drive the two steel wire ropes 37. The two steel wire ropes 37 carry the connector A21 and the connector B26. The fire extinguishing nozzle 23 sprays water to extinguish the fire. The hanging basket 31 picks up and drops off people. The motor 19 is connected to the battery, and the motor 19 is controlled to rotate by the remote control. The motor 19 drives the threaded rod 22 to rotate to make the screw sleeve 24 move left and right. When recovering, the two steel wire ropes 37 pull the two large ropes 36 respectively, and the two large ropes 36 pull the two small ropes 34.

[0040] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A method for using a high-rise building rescue fire truck, characterized in that: A cable guide mechanism (1) is fixedly installed on a wall (6) above a building (5), and the side thereof is fixedly connected to the upper end of a cable moving mechanism (3). The lower end of the cable moving mechanism (3) is installed on a vehicle (4). A moving mechanism (2) is installed in the middle of the cable moving mechanism (3). The cable guide mechanism (1) comprises a cable groove A (7), a guide tube A (8), a cable groove B (9), a guide tube B (10), a guide cable piece A (11), a guide cable piece B (12), a guide cable piece C (13), a column (14), a cover plate (15), a ball guide groove (16), a bottom plate (17), and an inlet (18). The top ends of the guide tubes A (8) and B (10) are fixedly connected to the guide cable pieces A (11), B (12), and C (13). One end of the guide tubes A (8) and B (10) is connected to the ball guide groove (16). The guide ball groove (16) is connected to the cover plate (15) on the upper side and to the bottom plate (17) on the lower side. The guide tube A (8) and the guide tube B (10) are respectively provided with a cable groove A (7) and a cable groove B (9). The cable groove A (7) and the cable groove B (9) correspond to the gaps between the guide cable pieces A (11), the guide cable pieces B (12) and the guide cable pieces C (13). The guide tubes A (8) and the guide cable pieces B (10) are installed on the fence (6). The bottom plate (17) is installed on the building (5). The two ends of the plurality of columns (14) are respectively connected to the guide cable pieces A (11), the guide cable pieces B (12), the guide cable pieces C (13) and the fence (6). The mobile machine The structure (2) is composed of a motor (19), a slide rail A (20), a connecting piece A (21), a threaded rod (22), a fire sprinkler (23), a screw sleeve (24), a connecting plate A (25), a connecting piece B (26), a slide rail B (27), a positioning shaft seat B (28), a connecting plate B (29), a connecting plate C (30), a hanging basket (31), and a positioning shaft seat C (32). The middle part of the threaded rod (22) is screwed into the screw sleeve (24), and the two ends are respectively inserted into the positioning shaft seat B (28) and the positioning shaft seat C (32). The positioning shaft seat B (28) and the positioning shaft seat C (32) are respectively sleeved on the two ends of the slide rail A (20) and the slide rail B (27). A (20), one end of the slide rail B (27) is fixedly connected to the motor (19), the positioning shaft seat B (28), the positioning shaft seat C (32) are respectively hinged to one end of the connecting plate A (25), the connecting plate C (30), the other end of the connecting plate A (25), the connecting plate C (30) are respectively hinged to the two ends of the connecting plate B (29), the connecting plate A (25), the connecting plate C (30) One end is hinged to the base of the connecting piece A (21), the connecting piece B (26), the connecting piece A (21), the connecting piece B (26) are respectively locked on the large wire rope (37) by the connecting piece, the upper and lower ends of the screw sleeve (24) are respectively connected to the hanging basket (31), the fire sprinkler (23),The cable transfer mechanism (3) is composed of two mirror-mounted round balls (33), two small cables (34), two fixed pulleys (35), two large cables (36), two steel wire ropes (37), two cable wheels A (38), two cable wheels B (39), two cable wheels C (40), two cable wheels D (41), two cable wheels E (42), and a winch frame (43). The two round balls (33) are respectively connected to the two small cables (34), the two small cables (34) are wound around the two cable wheels B (39), and the upper ends of the two large cables (36) are respectively wound around The four lower ends of the two fixed pulleys (35) are respectively wound around two cable wheels A (38) and two cable wheels B (39); the upper ends of the two steel wire ropes (37) are respectively wound around the two fixed pulleys (35) and the four lower ends are respectively wound around two cable wheels D (41) and two cable wheels E (42); the two cable wheels A (38), the two cable wheels B (39), the two cable wheels C (40), the two cable wheels D (41), and the two cable wheels E (42) are respectively mirror-mounted on the winch frame (43); the two fixed pulleys (35) are fixedly mounted on the building (5 ) side, when the winch frame (43) is installed on the vehicle (4) for use, first use a thrower or a drone to move the two balls (33) connected to the small ropes (34) and the two small ropes (34) to the two sides of the building (5), respectively, pull the two lightweight small ropes (34), move the two balls (33) along the bottom plate (17) into the ball guide groove (16), and then enter the ends of the conduit A (8) and the conduit B (10) along the entrance (18) at the top of the ball guide groove (16), respectively, and the small ropes (34) are respectively inserted into the rope grooves A (7) and rope grooves B (10). The groove B (9) moves along the cable groove A (7) and the cable groove B (9), and the small rope (34) passes over the cable groove A (7) and the cable groove B (9). The two balls (33) pass through the U-shaped conduit A (8) and the conduit B (10) and fall out from the other end to the ground. Two light small ropes (34) are respectively tied to one end of the two large ropes (36), and one end of the two large ropes (36) is pulled up and respectively wrapped around two fixed pulleys (35) and then pulled back and fixed to two rope wheels C (40). Then, the two large ropes (36) are respectively fixedly connected to the steel wire ropes (37). After the steel wire rope (37) is pulled up, it is passed around the connecting piece A (21) and the connecting piece B (26), and the moving mechanism (2) is connected to the two steel wire ropes (37). Two cable wheels E (42) are connected to the other ends of the two steel wire ropes (37). The two cable wheels E (42) rotate to drive the two steel wire ropes (37). The two steel wire ropes (37) are connected with the connecting piece A (21) and the connecting piece B (26). The fire sprinkler (23) sprays water to extinguish the fire, and the hanging basket (31) picks up and delivers people. The motor (19) is connected to the battery, and the motor (19) is controlled to rotate by the remote control. The motor (19) drives the threaded rod (22) to rotate so that the screw sleeve (24) moves left and right. When recovering, the two steel wire ropes (37) pull the two large ropes (36) respectively, and the two large ropes (36) pull the two small ropes (34).

2. The method for using the high-rise building rescue fire truck according to claim 1, characterized in that: The catheter A (8) is a U-shaped tube, hollow inside, and provided with a U-shaped through groove outside, through which the ball (33) can pass, and the small rope (34) can be inserted into the catheter A (8) through the U-shaped through groove.

3. The method for using the high-rise building rescue fire truck according to claim 1, characterized in that: The guide cable piece A (11), the guide cable piece B (12), and the guide cable piece C (13) are W-shaped on the top.

4. The method for using the high-rise building rescue fire truck according to claim 1, characterized in that: The cover plate (15) and the ball guide groove (16) are W-shaped. The cover plate (15) is installed obliquely on the ball guide groove (16). The ball guide groove (16) is installed obliquely on the bottom plate (17). The bottom plate (17) is installed obliquely on the building (5).

5. The method for using the high-rise building rescue fire truck according to claim 1, characterized in that: The positioning shaft seat B (28) and the positioning shaft seat C (32) can move left and right on the slide rail A (20), the threaded rod (22) and the slide rail B (27).

6. The method for using the high-rise building rescue fire truck according to claim 1, characterized in that: The fire extinguishing nozzle (23), the screw sleeve (24) and the hanging basket (31) can move left and right on the threaded rod (22).

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