Foldable rigid ruler applicable to the height measurement of large cruise ships

Abstract

The present invention discloses a foldable rigid ruler applicable to the height measurement of large cruise ships, which includes a first ruler sleeve, a convex rigid ruler, a rectangular rigid ruler and a second ruler sleeve. A tripod is connected to the bottom of the first ruler sleeve, a tape measure is arranged on the tripod, and the top of the tape measure is connected to the bottom of the first ruler sleeve. A spirit level is connected to the outside of the first ruler sleeve. The convex rigid ruler is connected to the inner cavity of the first ruler sleeve. Both ends of the rectangular rigid ruler are respectively connected to the convex rigid ruler and the second ruler sleeve through hinges. This foldable rigid ruler applicable to the height measurement of large cruise ships can determine the interference height between the air duct and the ceiling by measuring the height from the lower deck to the lower boundary of the ceiling. By measuring the height from the upper boundary of the ceiling to the upper deck, it can determine how much distance other air ducts, cable trays or water pipes can be raised upward to reduce the interference height between the air duct and the ceiling, providing data support for subsequent design modifications.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring tools, and particularly to a foldable rigid ruler applicable to the height measurement of large cruise ships. Background Art

[0002] The structural floor height of large cruise ships is generally 2800 mm, which is divided into two areas with the ceiling as the boundary. The area between the upper boundary of the ceiling and the upper deck is used to arrange outfitting parts such as ventilation pipes, cables, and water pipes, and the area between the lower deck and the lower boundary of the ceiling is used for personnel living and work communication. Due to the narrow space above, there will be a problem that the air duct interferes with the ceiling keel, affecting the installation of the ceiling; moreover, during the initial stage of cruise ship construction, the deck will be deformed within the range of 0 - 10 mm due to construction reasons. How to accurately measure the height between the air duct and the lower deck, as well as the height of the air duct, cable, and water pipe from the upper deck, is an important way to solve the interference between the air duct and the ceiling keel. For this reason, we propose a foldable rigid ruler applicable to the height measurement of large cruise ships. Summary of the Invention

[0003] The purpose of the present invention is to provide a foldable rigid ruler applicable to the height measurement of large cruise ships to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A foldable rigid ruler applicable to the height measurement of large cruise ships, including a first ruler sleeve, a convex rigid ruler, a rectangular rigid ruler, and a second ruler sleeve. A tripod is connected to the bottom of the first ruler sleeve, a tape measure is arranged on the tripod, and the top of the tape measure is connected to the bottom of the first ruler sleeve. A spirit level is connected to the outside of the first ruler sleeve. The convex rigid ruler is connected to the inner cavity of the first ruler sleeve. Both ends of the rectangular rigid ruler are respectively connected to the convex rigid ruler and the second ruler sleeve through hinges. A slider is arranged in the inner cavity of the second ruler sleeve, and abutting plates are arranged on both sides of the slider. The abutting plates are in contact with but not connected to the inner wall of the second ruler sleeve. A driving component is arranged in the inner cavity of the slider. The driving component penetrates through the slider and is connected to the second ruler sleeve. An advancing component is also arranged in the inner cavity of the slider. The advancing component is respectively connected to the driving component and the abutting plate.

[0005] Preferably, an elastic cord is arranged in the inner cavity of the second ruler sleeve. Both ends of the elastic cord are respectively connected to the bottom of the inner cavity of the second ruler sleeve and the slider. Two protective pulleys are symmetrically arranged on the outside of the elastic cord. The two protective pulleys are respectively connected to the driving component and the second ruler sleeve.

[0006] Preferably, the driving assembly includes a partition connected to the protective pulley, and a rack is arranged on the partition; it further includes a first gear and a second gear arranged in the inner cavity of the slider through a mounting seat. On the surfaces of the first gear and the second gear close to each other, a first connecting shaft and a second connecting shaft are respectively arranged. The end of the first connecting shaft is connected with a driving wheel, a transmission belt is arranged on the driving wheel, the driving wheel is connected with a driven wheel through the transmission belt, the driven wheel is connected with the bottom of the slider through a bearing seat, and the end of the driven wheel is connected with a first bevel gear. The end of the second connecting shaft is connected with a driving gear, the driving gear is connected with the bottom of the slider through a mounting seat, and the outer edge of the driving gear meshes with a driven gear. The driven gear is connected with the bottom of the slider through a bearing seat, and the end of the driven gear is connected with a second bevel gear.

[0007] Preferably, the advancing assembly includes a third bevel gear meshing with the first bevel gear and the second bevel gear. A worm is connected to the third bevel gear. The worm is connected with the bottom of the slider through a bearing seat, and a worm gear is meshed with the outer side of the worm. Both sides of the worm gear are connected with threaded rods. The threaded rods are connected with the bottom of the slider through bearing seats, and a threaded barrel is connected to the threaded rods. The end of the threaded barrel is connected with a sleeve. A second spring is arranged in the inner cavity of the sleeve. One end of the second spring is connected with the bottom of the sleeve, and the other end of the second spring is connected with a connecting rod. The connecting rod penetrates through the slider and is connected with the pressing plates on both sides of the slider.

[0008] Preferably, the inner cavities of the first gear and the second gear are both connected with an embedded ratchet and a connecting disc. A stop pawl and a mounting plate are connected to the connecting disc. A first spring is connected to the mounting plate. Both ends of the first spring are respectively connected with the stop pawl and the mounting plate, and the embedded ratchets and the stop pawls in the inner cavity of the first gear are in the opposite direction to the embedded ratchets and the stop pawls in the inner cavity of the second gear.

[0009] Preferably, the first connecting shaft and the second connecting shaft are respectively connected with the connecting discs in the inner cavities of the first gear and the second gear.

[0010] Preferably, one end of the connecting rod located in the inner cavity of the sleeve is connected with a limiting ring, and the connecting rod is connected with the second spring through the limiting ring.

[0011] Preferably, limiting blocks are connected to both sides of the slider, and the slider is connected with the second ruler sleeve through the limiting blocks.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] By providing a first ruler sleeve, a convex rigid ruler, a rectangular rigid ruler, and a second ruler sleeve, the interference height between the air duct and the ceiling can be determined by measuring the height from the lower deck to the lower boundary of the ceiling; the distance that other air ducts, cable trays, or water pipes can be raised upward can be determined by measuring the height from the upper boundary of the ceiling to the upper deck, so as to reduce the interference height between the air duct and the ceiling, providing data support for subsequent design modifications. At the same time, by providing a driving component and an advancing component, when the slider slides in the second ruler sleeve, the frictional force between the pressing plates on both sides of the slider and the second ruler sleeve due to wear is avoided from becoming smaller, and the overall setting effectively improves the practical performance of the measuring tool. Description of the Drawings

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

[0015] Figure 2 For the present invention Figure 1 It is an enlarged view of the structure at A in the present invention;

[0016] Figure 3 It is a cross-sectional view of the structure of the second ruler sleeve of the present invention;

[0017] Figure 4 It is a schematic diagram of the structure of the slider of the present invention;

[0018] Figure 5 For the present invention Figure 4 It is an enlarged view of the structure at B in the present invention;

[0019] Figure 6 It is a partial cross-sectional view of the structure of the slider of the present invention;

[0020] Figure 7 For the present invention Figure 6 It is an enlarged view of the structure at C in the present invention;

[0021] Figure 8 It is a cross-sectional view of the structure of the sleeve of the present invention;

[0022] Figure 9 It is a schematic diagram of the structure of the first gear of the present invention;

[0023] Figure 10 It is a schematic diagram of the structure of the second gear of the present invention.

[0024] In the figure: 1 - first ruler sheath; 2 - tripod; 3 - spirit level; 4 - convex hard ruler; 5 - rectangular hard ruler; 6 - second ruler sheath; 7 - slider; 71 - limiting block; 8 - pressing plate; 9 - driving assembly; 91 - partition board; 92 - rack; 93 - first gear; 931 - embedded ratchet wheel; 932 - connecting disk; 933 - stop pawl; 934 - mounting plate; 935 - first spring; 94 - second gear; 95 - first connecting shaft; 96 - driving wheel; 97 - transmission belt; 98 - driven wheel; 99 - first bevel gear; 910 - second connecting shaft; 911 - driving gear; 912 - driven gear; 913 - second bevel gear; 10 - pressing-in assembly; 101 - worm; 102 - third bevel gear; 103 - worm gear; 104 - threaded rod; 105 - threaded barrel; 106 - sleeve; 107 - second spring; 108 - connecting rod; 1081 - limiting ring; 11 - elastic cord; 12 - protective pulley. Specific implementation manner

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Please refer to Figure 1-10 , the present invention provides a technical solution: a foldable hard ruler applicable to the height measurement of large cruise ships, including a first ruler sheath 1, a convex hard ruler 4, a rectangular hard ruler 5, and a second ruler sheath 6. The bottom of the first ruler sheath 1 is connected to a tripod 2. A tape measure is arranged on the tripod 2, and the top of the tape measure is connected to the bottom of the first ruler sheath 1. A spirit level 3 is connected to the outside of the first ruler sheath 1. The convex hard ruler 4 is connected to the inner cavity of the first ruler sheath 1. Both ends of the rectangular hard ruler 5 are respectively connected to the convex hard ruler 4 and the second ruler sheath 6 through hinges. A slider 7 is arranged in the inner cavity of the second ruler sheath 6. Pressing plates 8 are arranged on both sides of the slider 7. The pressing plates 8 are in contact with but not connected to the inner wall of the second ruler sheath 6. A driving assembly 9 is arranged in the inner cavity of the slider 7. The driving assembly 9 penetrates through the slider 7 and is connected to the second ruler sheath 6. A pressing-in assembly 10 is also arranged in the inner cavity of the slider 7. The pressing-in assembly 10 is respectively connected to the driving assembly 9 and the pressing plate 8. Among them, in order to facilitate the reset of the slider 7 after measurement, an elastic cord 11 is arranged in the inner cavity of the second ruler sheath 6. Both ends of the elastic cord 11 are respectively connected to the bottom of the inner cavity of the second ruler sheath 6 and the slider 7. Two protective pulleys 12 are symmetrically arranged on the outside of the elastic cord 11. The two protective pulleys 12 are respectively connected to the driving assembly 9 and the second ruler sheath 6. In addition, in order to make the slider 7 always move horizontally in the second ruler sheath 6, limiting blocks 71 are connected to both sides of the slider 7. The slider 7 is connected to the second ruler sheath 6 through the limiting blocks 71.

[0027] Specifically, unfold the rectangular rigid ruler 5 and the second ruler sleeve 6 around the hinge and fix them with a buckle. When encountering an uneven deck surface, observe the position of the bubble in the spirit level 3 and adjust the pan-tilt on the tripod 2 to keep the main part of the foldable rigid ruler always perpendicular to the deck surface. At this time, adjust the height of the convex rigid ruler 4 in the first ruler sleeve 1 so that the top of the second ruler sleeve 6 abuts against the bottom of the air duct, and the distance between the bottom of the air duct and the bottom of the first ruler sleeve 1 can be measured. At the same time, measure the distance between the bottom of the first ruler sleeve 1 and the lower deck with the tape measure at the bottom of the first ruler sleeve 1. The two measured values are the distance from the lower deck to the lower boundary of the ceiling. When measuring the distance from the upper boundary of the ceiling to the upper deck, the slider 7 slides down along the second ruler sleeve 6 when it encounters an air duct, cable tray or water pipe. When the top of the second ruler sleeve 6 reaches the inverted top of the upper deck, the slider 7 stops moving. The distance between the position where the slider 7 stops and the top of the second ruler sleeve 6 is the distance from the upper boundary of the ceiling to the upper deck.

[0028] The driving assembly 9 includes a partition 91 connected to the protective pulley 12, and a rack 92 is arranged on the partition 91; it also includes a first gear 93 and a second gear 94 arranged in the inner cavity of the slider 7 through a mounting seat. On the sides of the first gear 93 and the second gear 94 close to each other, a first connecting shaft 95 and a second connecting shaft 910 are respectively arranged. The end of the first connecting shaft 95 is connected with a driving wheel 96, a transmission belt 97 is arranged on the driving wheel 96, the driving wheel 96 is connected with a driven wheel 98 through the transmission belt 97, the driven wheel 98 is connected with the bottom of the slider 7 through a bearing seat, and the end of the driven wheel 98 is connected with a first bevel gear 99. The end of the second connecting shaft 910 is connected with a driving gear 911, the driving gear 911 is connected with the bottom of the slider 7 through a mounting seat, and the outer edge of the driving gear 911 meshes with a driven gear 912. The driven gear 912 is connected with the bottom of the slider 7 through a bearing seat, and the end of the driven gear 912 is connected with a second bevel gear 913. Among them, the inner cavities of the first gear 93 and the second gear 94 are both connected with an embedded ratchet 931 and a connecting disc 932. A stop pawl 933 and a mounting plate 934 are connected to the connecting disc 932. A first spring 935 is connected to the mounting plate 934. The two ends of the first spring 935 are respectively connected with the stop pawl 933 and the mounting plate 934. And the embedded ratchet 931 and the stop pawl 933 in the inner cavity of the first gear 93 are in the opposite direction to the embedded ratchet 931 and the stop pawl 933 in the inner cavity of the second gear 94. In addition, the first connecting shaft 95 and the second connecting shaft 910 are respectively connected with the connecting discs 932 in the inner cavities of the first gear 93 and the second gear 94.

[0029] Specifically, when the slider 7 slides downward in the second ruler sleeve 6, since both the first gear 93 and the second gear 94 are engaged with the rack 92 fixedly connected to the partition plate 91, the rack 92 drives the first gear 93 and the second gear 94 to rotate clockwise. Due to the acting force of the stop pawl 933 fixedly connected to the connecting disk 932, the first gear 93 drives the connecting disk 932 to rotate clockwise within the inner cavity of the first gear 93. At this time, since the embedded ratchet 931 and the stop pawl 933 in the inner cavity of the first gear 93 are in the opposite direction to the embedded ratchet 931 and the stop pawl 933 in the inner cavity of the second gear 94, when the second gear 94 rotates, it continuously pushes the stop pawl 933 on the connecting disk 932 to squeeze the first spring 935 fixedly connected thereto. Thus, when the slider 7 slides downward, the second gear 94 does not drive the connecting disk 932 within its inner cavity to rotate. When the connecting disk 932 within the inner cavity of the first gear 93 rotates, the connecting disk 932 drives the first connecting shaft 95 fixedly connected thereto to rotate, and the first connecting shaft 95 drives the driving wheel 96 fixedly connected to its end to rotate clockwise. Since the driving wheel 96 is connected to the driven wheel 98 through the transmission belt 97, the driving wheel 96 drives the driven wheel 98 to rotate clockwise through the transmission belt 97, so that the driven wheel 98 drives the first bevel gear 99 fixedly connected thereto to rotate clockwise. When the slider 7 moves upward in the second ruler sleeve 6, the first gear 93 and the second gear 94 rotate counterclockwise on the rack 92. At this time, due to the acting force of the stop pawl 933 within its inner cavity, the second gear 94 drives the connecting disk 932 to rotate counterclockwise within the inner cavity of the second gear 94. And since the embedded ratchet 931 and the stop pawl 933 in the inner cavity of the first gear 93 are in the opposite direction to the embedded ratchet 931 and the stop pawl 933 in the inner cavity of the second gear 94, the connecting disk 932 within the inner cavity of the first gear 93 does not rotate. When the connecting disk 932 within the inner cavity of the second gear 94 rotates counterclockwise, it drives the second connecting shaft 910 fixedly connected thereto to rotate counterclockwise, so that the second connecting shaft 910 drives the driving gear 911 fixedly connected thereto to rotate counterclockwise. At this time, since the driving gear 911 is meshed with the driven gear 912, the driving gear 911 drives the driven gear 912 to rotate clockwise, so that the driven gear 912 drives the second bevel gear 913 fixedly connected thereto to rotate clockwise. Thus, when the slider 7 moves up and down in the second ruler sleeve 6, both the first bevel gear 99 and the second bevel gear 913 rotate clockwise, which is convenient for driving the third bevel gear 102 to rotate clockwise when the slider 7 moves.

[0030] The advancing assembly 10 includes a third bevel gear 102 meshing with a first bevel gear 99 and a second bevel gear 913. A worm 101 is connected to the third bevel gear 102. The worm 101 is connected to the bottom of the slider 7 through a bearing block. A worm gear 103 meshes with the outer side of the worm 101. Threaded rods 104 are connected to both sides of the worm gear 103. The threaded rods 104 are connected to the bottom of the slider 7 through bearing blocks. A threaded barrel 105 is connected to the threaded rods 104. A sleeve 106 is connected to the end of the threaded barrel 105. A second spring 107 is arranged in the inner cavity of the sleeve 106. One end of the second spring 107 is connected to the bottom of the sleeve 106, and the other end of the second spring 107 is connected to a connecting rod 108. The connecting rod 108 penetrates through the slider 7 and is connected to the pressing plates 8 on both sides of the slider 7. Among them, in order to prevent the connecting rod 108 from disengaging from the sleeve 106, a limiting ring 1081 is connected to the end of the connecting rod 108 located in the inner cavity of the sleeve 106, and the connecting rod 108 is connected to the second spring 107 through the limiting ring 1081.

[0031] Specifically, since the third bevel gear 102 meshes with the first bevel gear 99 and the second bevel gear 913 respectively, when the slider 7 moves downward, the first bevel gear 99 drives the third bevel gear 102 to rotate clockwise. When the slider 7 moves upward, the second bevel gear 913 drives the third bevel gear 102 to rotate clockwise. When the third bevel gear 102 rotates, it drives the worm 101 fixedly connected thereto to rotate. Since the worm 101 and the worm gear 103 are meshingly connected, the worm 101 drives the worm gear 103 to rotate. At this time, the worm gear 103 drives the threaded rods 104 fixedly connected to both sides thereof to rotate. Since the transmission ratio between the worm 101 and the worm gear 103 is large, the threaded rods 104 rotate slowly. When the threaded rods 104 rotate, the threaded rods 104 drive the threaded barrel 105 threadedly connected thereto to rotate, so that the threaded barrel 105 moves away from the threaded rods 104. At this time, since the end of the threaded barrel 105 is connected to the sleeve 106 through a bearing, the threaded barrel 105 pushes the sleeve 106 to move while moving away from the threaded rods 104. At this time, since the connecting rod 108 is fixedly connected to the pressing plate 8, and the pressing plate 8 abuts against the inner wall of the second scale sleeve 6, the sleeve 106 squeezes the second spring 107 fixedly connected thereto when moving, so that the elasticity of the second spring 107 increases. Since the pressing plate 8 often rubs against the inner wall of the second scale sleeve 6, the friction force between the pressing plate 8 and the second scale sleeve 6 gradually becomes smaller. Therefore, the continuously increasing elasticity of the second spring 107 is used to drive the friction force between the pressing plate 8 and the second scale sleeve 6 to always maintain a fixed value.

[0032] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0033] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A foldable rigid ruler applicable to the height measurement of large cruise ships, comprising a first ruler sheath (1), a convex rigid ruler (4), a rectangular rigid ruler (5), and a second ruler sheath (6), characterized in that: A tripod (2) is connected to the bottom of the first ruler sleeve (1). A tape measure is arranged on the tripod (2), and the top of the tape measure is connected to the bottom of the first ruler sleeve (1). A spirit level (3) is connected to the outside of the first ruler sleeve (1). The convex hard ruler (4) is connected to the inner cavity of the first ruler sleeve (1). Both ends of the rectangular hard ruler (5) are respectively connected to the convex hard ruler (4) and the second ruler sleeve (6) through hinges and buckles. A slider (7) is arranged in the inner cavity of the second ruler sleeve (6). Tightening plates (8) are arranged on both sides of the slider (7). The tightening plates (8) are in contact with but not connected to the inner wall of the second ruler sleeve (6). A driving assembly (9) is arranged in the inner cavity of the slider (7). The driving assembly (9) penetrates through the slider (7) and is connected to the second ruler sleeve (6). An advancing assembly (10) is further arranged in the inner cavity of the slider (7). The advancing assembly (10) is respectively connected to the driving assembly (9) and the tightening plates (8). An elastic cord (11) is arranged in the inner cavity of the second ruler sleeve (6). Both ends of the elastic cord (11) are respectively connected to the bottom of the inner cavity of the second ruler sleeve (6) and the slider (7). Two protective pulleys (12) are symmetrically arranged on the outside of the elastic cord (11). The two protective pulleys (12) are respectively connected to the driving assembly (9) and the second ruler sleeve (6). The driving assembly (9) includes a partition plate (91) connected to the protective pulley (12). A rack (92) is arranged on the partition plate (91). It further includes a first gear (93) and a second gear (94) arranged in the inner cavity of the slider (7) through a mounting seat. A first connecting shaft (95) and a second connecting shaft (910) are respectively arranged on the sides of the first gear (93) and the second gear (94) close to each other. An end of the first connecting shaft (95) is connected to a driving wheel (96). A transmission belt (97) is arranged on the driving wheel (96). The driving wheel (96) is connected to a driven wheel (98) through the transmission belt (97). The driven wheel (98) is connected to the bottom of the slider (7) through a bearing seat. An end of the driven wheel (98) is connected to a first bevel gear (99). An end of the second connecting shaft (910) is connected to a driving gear (911). The driving gear (911) is connected to the bottom of the slider (7) through a mounting seat. The outer edge of the driving gear (911) meshes with a driven gear (912). The driven gear (912) is connected to the bottom of the slider (7) through a bearing seat. An end of the driven gear (912) is connected to a second bevel gear (913).

2. The foldable rigid ruler applicable to the height measurement of large cruise ships according to claim 1, characterized in that: The advancing assembly (10) includes a third bevel gear (102) meshing with a first bevel gear (99) and a second bevel gear (913). A worm (101) is connected to the third bevel gear (102). The worm (101) is connected to the bottom of the slider (7) through a bearing block. A worm gear (103) meshes with the outer side of the worm (101). Both sides of the worm gear (103) are connected with threaded rods (104). The threaded rods (104) are connected to the bottom of the slider (7) through bearing blocks. A threaded barrel (105) is connected to the threaded rods (104). A sleeve (106) is connected to the end of the threaded barrel (105). A second spring (107) is arranged in the inner cavity of the sleeve (106). One end of the second spring (107) is connected to the bottom of the sleeve (106), and the other end of the second spring (107) is connected with a connecting rod (108). The connecting rod (108) penetrates through the slider (7) and is connected with the pressing plates (8) on both sides of the slider (7).

3. The foldable rigid ruler applicable to the floor height measurement of large cruise ships according to claim 1, characterized in that: Inner ratchets (931) and connecting discs (932) are connected to the inner cavities of the first gear (93) and the second gear (94). A stop pawl (933) and a mounting plate (934) are connected to the connecting disc (932). A first spring (935) is connected to the mounting plate (934). Both ends of the first spring (935) are respectively connected to the stop pawl (933) and the mounting plate (934). The inner ratchets (931) and stop pawls (933) in the inner cavity of the first gear (93) are in opposite directions to the inner ratchets (931) and stop pawls (933) in the inner cavity of the second gear (94).

4. The foldable rigid ruler applicable to the height measurement of large cruise ships according to claim 1, wherein: The first connecting shaft (95) and the second connecting shaft (910) are respectively connected to the connecting discs (932) in the inner cavities of the first gear (93) and the second gear (94).

5. The collapsible rigid ruler applicable to the storey height measurement of large cruise ships according to claim 2, wherein: A limiting ring (1081) is connected to one end of the connecting rod (108) located in the inner cavity of the sleeve (106). The connecting rod (108) is connected to the second spring (107) through the limiting ring (1081).

6. The collapsible rigid ruler applicable to the storey height measurement of large cruise ships according to claim 1, wherein: Limiting blocks (71) are connected to both sides of the slider (7). The slider (7) is connected to the second ruler sleeve (6) through the limiting blocks (71).

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