Novel traction seat with clamping type structure

Abstract

The invention discloses a novel clamping type structure traction seat, and particularly relates to the technical field of traction seats, the novel clamping type structure traction seat comprises a lower shell assembly and an upper shell assembly, the middle parts, close to each other, of the lower shell assembly and the upper shell assembly are hinged to each other, and a traction assembly is mounted on the rear side of the upper shell assembly; a locking assembly is arranged on the front side of the upper shell assembly, and a sensor assembly is installed on the upper shell assembly. According to the novel traction seat of the clamping type structure, the traction assembly drives the locking assembly to complete opening and closing, manual opening and closing and automatic opening and closing can be achieved in cooperation with the inductor assembly in actual application, and the design of combining manual operation and automatic operation is adopted; the method greatly meets the diversified requirements of different users in different use situations, and can show extraordinary value no matter under the condition that manual accurate control is needed or under the condition that a convenient and efficient automatic operation mode is pursued.

Description

Technical Field

[0001] The invention relates to the technical field of fifth wheel, and in particular to a new type of fifth wheel with a clamping structure. Background Art

[0002] The fifth wheel is a component used to connect the tractor and trailer. It is installed on the tractor frame and cooperates with the towing pin on the trailer to realize the towing and steering operations of the tractor to the trailer. Its structure includes a seat body, which is generally made of high-strength metal materials and has mounting holes for fixing to the tractor frame; the towing pin hole size and shape match the trailer towing pin, and there is a wear-resistant bushing inside; the locking mechanism can lock the trailer towing pin. In the transportation industry, the fifth wheel is widely used in vehicle combinations such as semi-trailers and full trailers, which is very important for logistics and transportation companies to improve transportation efficiency and safety.

[0003] At present, the towing seat installed on domestic tractors is a traditional towing seat, which has a complex structure, high failure rate, cumbersome operation, high labor intensity, low work efficiency, and manual unlocking. When an abnormality occurs in the product, it cannot be discovered in time, and there is a certain risk of use. In view of this, it is necessary to develop a towing seat product with a simple structure, reliable performance and high automation. Summary of the invention

[0004] The main purpose of the present invention is to provide a novel clamping structure fifth wheel which can effectively solve the above-mentioned problems.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A novel clamping structure traction seat includes a lower shell assembly and an upper shell assembly. The lower shell assembly and the upper shell assembly are hinged to each other in the middle where they are close to each other. A traction assembly is installed on the rear side of the upper shell assembly, a locking assembly is arranged on the front side of the upper shell assembly, and a sensor assembly is installed on the upper shell assembly.

[0007] Preferably, the upper shell assembly includes a top plate and two fixed plates 2, two fixed plates 1 are longitudinally symmetrically installed on both sides of the bottom end of the top plate away from the middle, two fixed plates 3 are transversely symmetrically installed between the two fixed plates 1, two fixed plates 2 are longitudinally symmetrically installed between the two fixed plates 3, and the two fixed plates 2 divide the middle part of the bottom end of the top plate into three parts: a middle groove and two side grooves.

[0008] Preferably, the lower shell assembly includes a base plate, and four hinged plates are longitudinally symmetrically installed on both sides of the top end of the base plate away from the middle, and the two hinged plates on the same side are respectively hingedly installed on the two side surfaces of the inner cavity of the two side grooves, and a plurality of connecting grooves are horizontally equidistantly opened on both sides of the top end of the two base plates away from the middle.

[0009] Preferably, the locking assembly includes two extruded side plates and two locking pieces, the two extruded side plates are longitudinally symmetrically installed in the middle of the inner cavity of the middle groove, the two extruded side plates are symmetrically provided with two penetrating through grooves on the opposite front sides, the top rear sides of the two extruded side plates are connected to the upper side plate by screw threads, a fixing block 1 is fixedly installed in the middle of the front side of the top of the upper side plate, and two fixing rods 4 are symmetrically installed on both sides of the bottom end of the upper side plate away from the middle.

[0010] Preferably, the two locking members are located on the lower side of the upper side plate, and two hinged ears rotatably connected to the two fixing rods four are fixedly installed on the top rear sides of the two locking members, and a tension spring two is hung between the top rear sides of the two locking members, and a clamping hook one and a clamping hook two matched with the two through grooves are respectively installed on the end surfaces of the two locking members close to the two extrusion side plates, and two fixing blocks two are symmetrically installed on the front sides of the opposite surfaces of the two extrusion side plates.

[0011] Preferably, the rotating block includes a fixing ring, a rotating rod, a fixing rod one, a fixing rod three and a fixing ear, the fixing ring is fixedly installed on the rear side of the middle part of the bottom end of the top plate, a threaded rod is slidably installed on the inner cavity surface of the fixing ring, and two nuts are respectively threadedly installed on the rear side of the outer surface of the threaded rod, a connecting block is fixedly installed on one end of the nut close to the rearmost fixing plate three, a locking fork is fixedly installed on the top middle of the connecting block, and two ends of the locking fork away from the connecting block penetrate the fixing plate three on the rearmost side and slidably extend into the inner cavity of the middle groove, and two opposite surfaces of the locking fork in the vertical direction respectively conflict with the two locking members.

[0012] Preferably, a spring is sleeved on the outer surface of the threaded rod, and the spring is pressed between the nut and the connecting block. The fixing rod three is fixedly installed on the right side of the bottom end of the top plate close to the threaded rod, and a rotating block is rotatably installed on the outer surface of the fixing rod three, and an arc groove sliding with the phase is penetrated through the top of the rotating block, and a connecting ring is fixedly installed on the side of the top of the rotating block away from the connecting block, and the fixing ear is fixedly installed on the right side of the fixing plate three on the rear side, and a tension spring 1 is hung between the fixing ear and the connecting ring.

[0013] Preferably, the rotating rod is fixedly installed on the upper right side of the bottom end of the top plate away from the middle, the outer surface of the rotating rod is rotatably connected to a cylinder, a hinged frame is fixedly installed on the output end of the cylinder, the hinged frame is rotatably connected to the rotating block, the fixed rod 1 is fixedly installed on the upper left side of the bottom end of the top plate close to the middle, a stop block is rotatably installed on the outer surface of the fixed rod 1, the end of the stop block away from the fixed rod 1 is abutted against the locking fork, the stop block is clamped with the connecting block, a pull rod is hooked in the inner cavity of the connecting ring, and the pull rod passes through the fixed plate 1 on the far left in the horizontal direction.

[0014] Preferably, the sensor assembly includes a solenoid valve, a proximity switch 1, a proximity switch 2 and a proximity switch 3. The solenoid valve is fixedly installed on the rightmost side of the bottom end of the top plate away from the middle, the proximity switch 1 is fixedly installed on the right side of the bottom end of the top plate close to the stop block, the proximity switch 2 is installed through the top of the fixed block 2 on the far right, and the proximity switch 3 is installed through the top of the fixed block 1.

[0015] Compared with the prior art, the present invention has the following beneficial effects: the present invention uses a traction assembly to drive a locking assembly to complete opening and closing. In actual use, it can be used in conjunction with a sensor assembly to achieve both manual opening and closing and automatic opening and closing. This design combining manual and automatic greatly meets the diverse needs of different users in different usage scenarios. Whether it is in situations where precise manual control is required or in an automatic operation mode that pursues convenience and efficiency, the present invention can demonstrate its extraordinary value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the connection structure of the upper housing component and the traction lock component in the present invention;

[0018] Figure 3 It is a schematic diagram of the connection structure between the upper housing component and the traction component in the present invention;

[0019] Figure 4 For the present invention Figure 3 A magnified schematic diagram of the node at A in the middle;

[0020] Figure 5 It is a schematic diagram of the connection structure between the upper housing assembly and the locking assembly of the present invention;

[0021] Figure 6 For the present invention Figure 5 Schematic diagram of the cross-section split structure at B in the middle;

[0022] Figure 7It is a schematic diagram of the side elevation structure of the lower shell assembly in the present invention;

[0023] Figure 8 It is a structural schematic diagram of the control panel of the present invention.

[0024] In the figure: 20, lower shell assembly; 21, bottom plate; 22, hinged plate; 23, connecting groove; 30, upper shell assembly; 31, top plate; 32, fixed plate 1; 33, fixed plate 2; 34, side groove; 35, middle groove; 36, fixed plate 3; 40, traction assembly; 41, fixed ring; 42, threaded rod; 43, nut; 44, rotating rod; 3, cylinder; 45, hinged frame; 46, fixed rod 1; 47, connecting block; 471, pull rod; 4, rotating block; 481, arc groove; 482, connecting ring; 483, fixed rod 3; 49, fixed hanging ear; 5, stop block ;6. Pull rod;7. Tension spring one;8. Locking fork;9. Spring;50. Sensor assembly;2. Solenoid valve;10. Proximity switch one;15. Proximity switch two;17. Proximity switch three;19. Control panel;1. Switch;11. Unlock indicator light;16. Separation indicator light;18. Lock indicator light;60. Locking assembly;61. Upper side plate;62. Fixed rod four;63. Fixed block one;64. Extrusion side plate;641. Through groove;642. Articulated ear;643. Fixed block two;65. Locking piece;12. Tension spring two;13. Clamping hook one;14. Clamping hook two. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0026] like Figure 1-Figure 8 As shown, a novel clamping structure traction seat includes a lower shell assembly 20 and an upper shell assembly 30. The lower shell assembly 20 and the upper shell assembly 30 are hinged to each other at the middle part close to each other. A traction assembly 40 is installed on the rear side of the upper shell assembly 30, a locking assembly 60 is arranged on the front side of the upper shell assembly 30, and a sensor assembly 50 is installed on the upper shell assembly 30;

[0027] In this solution, the locking assembly 60 is driven by the traction assembly 40 to complete the opening and closing. In actual use, it can be used in conjunction with the sensor assembly 50 to achieve manual opening and closing and automatic opening and closing. This design that combines manual and automatic greatly meets the diverse needs of different users in different usage scenarios.

[0028] Specifically, the upper shell assembly 30 includes a top plate 31 and two second fixing plates 33. Two first fixing plates 32 are longitudinally symmetrically installed on both sides of the bottom end of the top plate 31 away from the middle, and two third fixing plates 36 are transversely symmetrically installed between the two first fixing plates 32. The two second fixing plates 33 are longitudinally symmetrically installed between the two third fixing plates 36. The two second fixing plates 33 divide the middle part of the bottom end of the top plate 31 into three parts: a middle groove 35 and two side grooves 34.

[0029] The lower housing assembly 20 includes a bottom plate 21, and four hinge plates 22 are longitudinally symmetrically installed on both sides of the top of the bottom plate 21 away from the middle. The two hinge plates 22 on the same side are hingedly installed on the two side surfaces of the inner cavity of the two side grooves 34, and a plurality of connecting grooves 23 are horizontally equidistantly opened on both sides of the top of the two bottom plates 21 away from the middle.

[0030] In actual use, the bottom plate 21 is placed on the frame crossbeam and is threadedly connected to the frame crossbeam by screws, and the top plate 31 is parallel to the bottom plate 21 and hinged to each other. In this way, when the road conditions are complicated during towing, and when the vehicle is driving on an uneven road surface such as potholes, bumps, and slopes, the traction seat can be rotated up and down, so that the trailer can better adapt to the changes in the road surface, reduce the twisting force, and ensure the stability and safety of the vehicle.

[0031] Specifically, the locking assembly 60 includes two extruded side plates 64 and two locking members 65. The two extruded side plates 64 are longitudinally symmetrically installed in the middle of the inner cavity of the middle groove 35. Two through slots 641 are symmetrically provided on the opposite front sides of the two extruded side plates 64. The top rear sides of the two extruded side plates 64 are connected to the upper side plate 61 by screw threads. A fixing block 1 63 is fixedly installed in the middle of the front side of the top of the upper side plate 61. Two fixing rods 4 62 are symmetrically installed on both sides of the bottom of the upper side plate 61 away from the middle.

[0032] The two locks 65 are located at the lower side of the upper side plate 61, and two hinged ears 642 rotatably connected to the two fixing rods 4 62 are fixedly installed on the rear sides of the top ends of the two locks 65, and a tension spring 2 12 is hung between the rear sides of the top ends of the two locks 65. The end surfaces of the two locks 65 close to the two extrusion side plates 64 are respectively installed with a clamping hook 13 and a clamping hook 2 14 adapted to the two through grooves 641, and two fixing blocks 2 643 are symmetrically installed on the front sides of the opposite surfaces of the two extrusion side plates 64.

[0033] The rotating block 4 includes a fixing ring 41, a rotating rod 44, a fixing rod 1 46, a fixing rod 3 483 and a fixing ear 49. The fixing ring 41 is fixedly installed on the rear side of the middle part of the bottom end of the top plate 31. A threaded rod 42 is slidably installed on the inner surface of the fixing ring 41. Two nuts 43 are respectively threadedly installed on the rear side of the outer surface of the threaded rod 42. A connecting block 47 is fixedly installed on one end of the nut 43 close to the rearmost fixing plate 3 36. A 471 is fixedly installed on the middle part of the top end of the connecting block 47. A locking fork 8 is fixedly installed on one end of the connecting block 47 away from the threaded rod 42. Both ends of the locking fork 8 away from the connecting block 47 penetrate the rearmost fixing plate 3 36 and slide to extend into the inner cavity of the middle groove 35. Two opposite surfaces of the locking fork 8 in the vertical direction respectively conflict with the two locking members 65.

[0034] The rotating rod 44 is fixedly mounted on the upper right side of the bottom end of the top plate 31 away from the middle, the outer surface of the rotating rod 44 is rotatably connected with the cylinder 3, the output end of the cylinder 3 is fixedly mounted with a hinge frame 45, the hinge frame 45 is rotatably connected with the rotating block 4, the fixed rod 1 46 is fixedly mounted on the upper left side of the bottom end of the top plate 31 near the middle, the outer surface of the fixed rod 1 46 is rotatably mounted with a stop block 5, the end of the stop block 5 away from the fixed rod 1 46 is abutted against the locking fork 8, the stop block 5 is clamped with the connecting block 47, the inner cavity of the connecting ring 482 is hooked with a pull rod 6, and the pull rod 6 passes through the leftmost fixed plate 1 32 in the horizontal direction;

[0035] The sensor assembly 50 includes a solenoid valve 2, a proximity switch 10, a proximity switch 2 15 and a proximity switch 3 17. The solenoid valve 2 is fixedly mounted on the rightmost side of the bottom end of the top plate 31 away from the middle, the proximity switch 10 is fixedly mounted on the right side of the bottom end of the top plate 31 close to the stop block 5, the proximity switch 2 15 is installed through the top of the rightmost fixed block 2 643, and the proximity switch 3 17 is installed through the top of the fixed block 1 63;

[0036] When the device needs to be unlocked: the solenoid valve 2 is controlled by switch 1 to ventilate the cylinder 3, and the piston rod of the cylinder 3 pushes the rotating block 4 to rotate by connecting with the rotating block 4. When the rotating block 4 rotates, it also pushes the stop block 5 to rotate to release the safety state. The pull rod 6 and the tension spring 7 are connected with the rotating block 4 and are simultaneously popped out and stretched. When the rotating block 4 rotates, it drives the locking fork 8 pin to move, and the locking fork 8 moves up at the same time. The spring 9 is compressed to release the locking state. When the locking fork 8 moves up to the final position, the proximity switch 10 senses the locking fork 8. At this time, the proximity switch 10 turns on the unlocking indicator light 11, and the unlocking is completed. Under the pulling force of the tension spring 2 12, the clamping hook 13 and the clamping hook 2 14 are pulled to the left and right sides respectively. The clamping hook 2 14 opens to the final position. When the proximity switch 2 15 senses the clamping hook 2 14, the proximity switch 2 15 turns on the separation indicator light 16, and at this time, the proximity switch 3 17 does not detect that the traction pin is in the disconnected state, and the proximity switch 3 17 and the locking indicator light 18 are not connected, and the locking indicator light 18 goes out. Finally, the switch 1 controls the solenoid valve 2 to exhaust the cylinder 3, and the tension spring 17 is connected to the rotating block 4. The tension spring 17 rotates the rotating block 4 through the tension. When the rotating block 4 rotates, it drives the locking fork 8 to move downward, and the lower ends of the locking fork 8 enter the grooves on both sides of the clamping hook 13 and the clamping hook 14. At this time, the pre-hanging state is completed. If the cylinder 3 cannot work normally, the above action can be manually achieved by pulling the pull rod 6;

[0037] When the device needs to be locked: after the traction seat is in the unlocked state, when the trailer is being pulled, the traction pin enters the traction seat, and the traction pin collides with the clamping hook 13 and the clamping hook 2 14, driving the clamping hook 13 and the clamping hook 2 14 to automatically move inward at the same time to clamp the traction pin firmly; when the clamping hook 13 and the clamping hook 2 14 move, the locking fork 8 moves upward at the same time, and the lower ends of the locking fork 8 are disengaged from the grooves on both sides of the clamping hook 13 and the clamping hook 2 14; when the clamping hook 13 and the clamping hook 2 14 clamp the traction pin in place, the locking fork 8 moves downward under the drive of the spring 9, the tension spring 17 and the rotating block 4, and the lower ends of the locking fork 8 are locked with the clamping hook 1 13 and the two sides of the clamping hook 2 14 are in flat contact to achieve locking. Since the traction pin is clamped in place by the clamping hook 13 and the clamping hook 2 14, the proximity switch 3 17 senses the traction pin, and the proximity switch 3 17 turns on the locking indicator light 18, which is lit. At the same time, the locking fork 8 and the clamping hook 14 are separated from their original positions. The proximity switch 10 cannot sense that the locking fork 8 is disconnected from the unlocking indicator light 11, and the indicator light goes out. The proximity switch 2 15 cannot sense that the clamping hook 2 14 is disconnected from the separation indicator light 16, and the indicator light goes out. Since the locking fork 8 moves downward, the backstop block 5 automatically rotates to the top of the locking fork 8 to prevent the locking fork 8 from retreating, and the locking is completed.

[0038] In this solution, the air source of the cylinder 3 comes from the air pump on the vehicle, and the cylinder 3 is connected to the air pump on the vehicle. The connection method and control method of the two belong to the conventional solutions of the prior art and will not be elaborated in detail in the present invention.

[0039] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A novel clamping structure fifth wheel, comprising a lower housing assembly (20) and an upper housing assembly (30), characterized in that: The lower shell component (20) and the upper shell component (30) are hinged to each other at their middle parts close to each other, a traction component (40) is installed on the rear side of the upper shell component (30), a locking component (60) is arranged on the front side of the upper shell component (30), and a sensor component (50) is installed on the upper shell component (30).

2. The novel clamping structure fifth wheel according to claim 2 is characterized by: The upper shell assembly (30) comprises a top plate (31) and two second fixing plates (33); two first fixing plates (32) are longitudinally symmetrically installed on both sides of the bottom end of the top plate (31) away from the middle; two third fixing plates (36) are transversely symmetrically installed between the two first fixing plates (32); the two second fixing plates (33) are longitudinally symmetrically installed between the two third fixing plates (36); the two second fixing plates (33) divide the middle part of the bottom end of the top plate (31) into three parts: a middle groove (35) and two side grooves (34).

3. The novel clamping structure fifth wheel according to claim 3 is characterized by: The lower shell assembly (20) comprises a bottom plate (21), and four hinge plates (22) are longitudinally symmetrically mounted on two sides of the top end of the bottom plate (21) away from the middle, and the two hinge plates (22) located on the same side are hingedly mounted on the two side surfaces of the inner cavity of the two side grooves (34), respectively, and a plurality of connection grooves (23) are transversely equidistantly opened on two sides of the top end of the two bottom plates (21) away from the middle.

4. The novel clamping structure fifth wheel according to claim 3 is characterized by: The locking assembly (60) includes two extruded side plates (64) and two locking pieces (65). The two extruded side plates (64) are longitudinally symmetrically installed in the middle of the inner cavity of the middle groove (35). Two through slots (641) are symmetrically provided on the opposite front sides of the two extruded side plates (64). The top rear sides of the two extruded side plates (64) are connected to the upper side plate (61) by screw threads. A fixing block 1 (63) is fixedly installed in the middle of the top front side of the upper side plate (61). Two fixing rods 4 (62) are symmetrically installed on both sides of the bottom end of the upper side plate (61) away from the middle.

5. The novel clamping structure fifth wheel according to claim 4 is characterized by: The two locking members (65) are located at the lower side of the upper side plate (61), and two hinged ears (642) rotatably connected to the two fixing rods (62) are fixedly installed on the rear sides of the top ends of the two locking members (65). A tension spring (12) is hung between the rear sides of the top ends of the two locking members (65). A clamping hook (13) and a clamping hook (14) matched with the two through grooves (641) are respectively installed on the end surfaces of the two locking members (65) close to the two extrusion side plates (64), and two fixing blocks (643) are symmetrically installed on the front sides of the opposite surfaces of the two extrusion side plates (64).

6. The novel clamping structure fifth wheel according to claim 5, characterized in that: The rotating block (4) comprises a fixing ring (41), a rotating rod (44), a fixing rod 1 (46), a fixing rod 3 (483) and a fixing hook (49); the fixing ring (41) is fixedly mounted on the rear side of the middle part of the bottom end of the top plate (31); a threaded rod (42) is slidably mounted on the inner surface of the fixing ring (41); two nuts (43) are respectively threadedly mounted on the rear side of the outer surface of the threaded rod (42); one end of the nut (43) close to the rearmost fixing plate 3 (36) is fixedly mounted on the fixing plate 3 (36) A connecting block (47) is fixedly installed, and a (471) is fixedly installed in the middle of the top end of the connecting block (47). A locking fork (8) is fixedly installed at one end of the connecting block (47) away from the threaded rod (42). The two ends of the locking fork (8) away from the connecting block (47) penetrate the third fixing plate (36) on the rear side and slide into the inner cavity of the middle groove (35). The two opposite surfaces of the locking fork (8) in the vertical direction respectively contact with the two locking members (65).

7. The novel clamping structure fifth wheel according to claim 6, characterized in that: The outer surface of the threaded rod (42) is sleeved with a spring (9), and the spring (9) is held between the nut (43) and the connecting block (47). The fixed rod three (483) is fixedly mounted on the right side of the bottom end of the top plate (31) close to the threaded rod (42). The outer surface of the fixed rod three (483) is rotatably mounted with a rotating block (4), and the top of the rotating block (4) is penetrated by an arc groove (481) that slides with the (471). A connecting ring (482) is fixedly mounted on the side of the top of the rotating block (4) away from the connecting block (47). The fixed hanging ear (49) is fixedly mounted on the right side of the rearmost fixed plate three (36), and a tension spring one (7) is hung between the fixed hanging ear (49) and the connecting ring (482).

8. The novel clamping structure fifth wheel according to claim 7 is characterized by: The rotating rod (44) is fixedly mounted on the upper right side of the bottom end of the top plate (31) away from the middle, the outer surface of the rotating rod (44) is rotatably connected to the cylinder (3), the output end of the cylinder (3) is fixedly mounted with a hinge frame (45), the hinge frame (45) is rotatably connected to the rotating block (4), the fixed rod (46) is fixedly mounted on the upper left side of the bottom end of the top plate (31) close to the middle, the outer surface of the fixed rod (46) is rotatably mounted with a stop block (5), the end of the stop block (5) away from the fixed rod (46) is abutted against the locking fork (8), the stop block (5) is clamped with the connecting block (47), the inner cavity of the connecting ring (482) is hooked with a pull rod (6), the pull rod (6) passes through the leftmost fixed plate (32) in the horizontal direction.

9. The novel clamping structure fifth wheel according to claim 8, characterized in that: The sensor assembly (50) comprises a solenoid valve (2), a proximity switch 1 (10), a proximity switch 2 (15) and a proximity switch 3 (17); the solenoid valve (2) is fixedly mounted on the rightmost side of the bottom end of the top plate (31) away from the middle; the proximity switch 1 (10) is fixedly mounted on the right side of the bottom end of the top plate (31) close to the stop block (5); the proximity switch 2 (15) is installed through the top of the rightmost fixed block 2 (643); and the proximity switch 3 (17) is installed through the top of the fixed block 1 (63).

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