Anti-falling mechanism

Abstract

The utility model discloses an anti-falling mechanism which comprises a fixed guide rail and a movable guide rail, and the movable guide rail is installed on the fixed guide rail in a sliding mode. A wedge block is fixedly mounted on the movable guide rail, and a lock bolt assembly capable of moving up and down relative to the wedge block is arranged on the wedge block; the lock bolt assembly comprises a bolt column and a toothed roller, the toothed roller is rotationally connected with the bolt column, and the toothed roller is arranged between the fixed guide rail and the movable guide rail; and a compression spring and a sliding gasket are mounted on the bolt column in a sleeving manner. The lock bolt assembly is arranged between the fixed guide rail and the movable guide rail, the fixed guide rail and the movable guide rail are locked through the toothed rollers, the movable guide rail is prevented from automatically and rapidly sliding down in a free falling state, the structure is simple, and use is safe and reliable.

Description

Technical Field

[0001] The utility model belongs to the technical field of transport tools, and particularly relates to an anti-falling mechanism. Background Art

[0002] Handling tools often have a lifting function, achieved by extending them through multiple slidingly connected rails. Existing rails are often connected by a rack-and-pinion structure. A motor drives the gears, which mesh with the racks on the rails and the gears on the motor, allowing the rails to extend and thus rise and fall. However, existing rails often lack locking mechanisms. If the motor fails, the load and the rails will fall synchronously, posing a safety hazard. Therefore, a fall prevention mechanism is needed to overcome this difficulty. Summary of the Invention

[0003] In response to the problems existing in the prior art, the utility model designs an anti-fall mechanism. The utility model provides a locking bolt assembly between the fixed guide rail and the movable guide rail, and locks the two by a toothed roller to prevent the movable guide rail from automatically and quickly sliding down in a free fall state. The structure is simple and the use is safe and reliable.

[0004] The invention object of the utility model is achieved through the following technical solutions: an anti-fall mechanism, comprising a fixed guide rail and a movable guide rail, the movable guide rail being slidably mounted on the fixed guide rail; a wedge being fixedly mounted on the movable guide rail, the wedge being provided with a locking bolt assembly which can move up and down relative to the wedge; the locking bolt assembly comprising a bolt post and a toothed roller, the toothed roller being rotatably connected to the bolt post, the toothed roller being arranged between the fixed guide rail and the movable guide rail; a compression spring and a sliding washer being sleeved on the bolt post.

[0005] Preferably, the movable guide rail is provided with a plurality of guide wheels rotatably connected thereto at both ends, and the fixed guide rail is provided with guide grooves arranged in pairs; the guide grooves extend along the axial direction of the fixed guide rail, and the guide wheels are slidably installed in the guide grooves.

[0006] Preferably, the guide wheels are symmetrically distributed on the left and right sides of the movable guide rail, and the guide grooves are symmetrically distributed on the left and right sides of the fixed guide rail; the outer contours of the guide wheels and the outer contours of the guide grooves match each other, and the left and right spacing of the two guide wheels and the left and right spacing of the two guide grooves are adapted to each other.

[0007] By providing the guide wheel, the movable guide rail can slide more smoothly relative to the fixed guide rail; the guide wheel is limited by the guide groove, which prevents the movable guide rail from separating from the fixed guide rail.

[0008] As preferred, the lock bolt assembly further comprises a roller and a limiting pin; the roller is fixedly installed on the bolt column, and a toothed roller is rotatably connected to the roller; the bolt column is fixedly connected with the limiting pin; the bottom of the wedge block is provided with a support portion, and a compression spring is arranged between the support portion and the limiting pin; the end of the compression spring is provided with a sliding washer, and the sliding washer abuts against the support portion; the fixed guide rail is provided with a guide groove, and the toothed roller is arranged between the guide groove and the wedge block.

[0009] As preferred, the support portion is provided with a mounting hole penetrating the bolt column; the diameter of the mounting hole is larger than the outer diameter of the bolt column, and the diameter of the mounting hole is smaller than the sliding washer; one end of the compression spring abuts against the limiting pin, and the other end of the compression spring abuts against the sliding washer.

[0010] As preferred, the toothed rollers are arranged in pairs on the roller; the wedge block is provided with an inclined surface, and an included angle is arranged between the inclined surface and the inner wall of the guide groove; the toothed roller is arranged close to the inclined surface.

[0011] As preferred, the included angle between the inclined surface and the inner wall of the guide groove is smaller than the self-locking rotation angle of the toothed roller; a gap is arranged between the toothed roller and the guide groove in a non-free fall state; and the movable guide rail can move up and down relative to the fixed guide rail; in a free fall state, the toothed roller moves up along the inclined surface, and the gap between the guide groove and the wedge block disappears.

[0012] As preferred, the fixed guide rail and the movable guide rail are arranged in parallel with each other, and the fixed guide rail and the movable guide rail are both provided with a mounting; the lock bolt assembly moves along the vertical direction.

[0013] The lock bolt assembly has a certain weight, and the compression spring is in a compressed state in a default state, at which time the fixed guide rail and the movable guide rail are both in a non-free fall state; at this time, the bolt column penetrates into the mounting hole, and the toothed roller abuts against the inclined surface of the wedge block; in this way, a gap is left between the toothed roller and the guide groove of the fixed guide rail, the lock bolt assembly is in an unlocked state, and the movable guide rail can freely slide up and down relative to the fixed guide rail; when the movable guide rail is in a falling state, the movable guide rail approaches a free fall motion; the lock bolt assembly is in a weightless state, the compression spring automatically retracts to move the lock bolt assembly as a whole upward; when the lock bolt assembly moves upward, the toothed roller moves along the inclined surface of the wedge block, and finally the toothed roller abuts against the inner wall of the guide groove; at this time, the gap between the toothed roller and the guide groove of the fixed guide rail disappears, and the lock bolt assembly is in a locked state, thereby preventing the movable guide rail from continuing to fall. At this time, the movable guide rail can still be lifted by an external force.

[0014] Compared with the existing technology, the present invention has the following advantages: 1. The relative movement of the movable and fixed guide rails facilitates automatic adjustment of their extension lengths. 2. The automatic cooperation of the locking bolt assembly and the compression spring prevents the movable guide rail from rapidly falling in a free-fall state, resulting in a good locking effect and safe and reliable use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the utility model;

[0016] Figure 2 A three-dimensional diagram from another perspective of the present invention;

[0017] Figure 3 It is an exploded view of the utility model;

[0018] Figure 4 for Figure 3 A partial enlarged view of position A in the middle;

[0019] Figure 5 It is a working schematic diagram of the lock bolt assembly in the unlocked state;

[0020] Figure 6 It is a working schematic diagram of the lock bolt assembly in a locked state;

[0021] Markings in the figure: 1. Fixed guide rail; 2. Movable guide rail; 3. Wedge; 31. Support part; 32. Mounting hole; 33. Inclined surface; 4. Lock bolt assembly; 41. Bolt; 42. Toothed roller; 43. Roller; 44. Limit pin; 5. Compression spring; 6. Sliding washer; 7. Guide wheel; 8. Guide groove. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0023] like Figures 1 to 6 As shown, this embodiment discloses an anti-fall mechanism, including a fixed guide rail 1 and a movable guide rail 2, the movable guide rail 2 is slidably mounted on the fixed guide rail 1; a wedge 3 is fixedly mounted on the movable guide rail 2, and a locking bolt assembly 4 that can move up and down relative to the wedge 3 is provided on the wedge 3; the locking bolt assembly 4 includes a bolt post 41 and a toothed roller 42, the toothed roller 42 is rotatably connected to the bolt post 41, and the toothed roller 42 is arranged between the fixed guide rail 1 and the movable guide rail 2; a compression spring 5 and a sliding washer 6 are sleeved on the bolt post 41.

[0024] The movable guide rail 2 is provided with a plurality of guide wheels 7 rotatably connected thereto at both ends. The fixed guide rail 1 is provided with a pair of guide grooves 8. The guide grooves 8 extend axially along the fixed guide rail 1, and the guide wheels 7 are slidably mounted within the guide grooves 8. The guide wheels 7 are symmetrically distributed on the left and right sides of the movable guide rail 2, and the guide grooves 8 are symmetrically distributed on the left and right sides of the fixed guide rail 1. The outer contours of the guide wheels 7 and the outer contours of the guide grooves 8 complement each other, and the left-right spacing between the two guide wheels 7 and the left-right spacing between the two guide grooves 8 are mutually adapted.

[0025] The lock bolt assembly 4 also includes a roller 43 and a stop pin 44. The roller 43 is fixedly mounted on the bolt 41 and is provided with a toothed roller 42 rotatably connected thereto. The bolt 41 is provided with a stop pin 44 fixedly connected thereto. The bottom of the wedge block 3 is provided with a support portion 31. A compression spring 5 is provided between the support portion 31 and the stop pin 44. The end of the compression spring 5 is provided with a sliding washer 6, which abuts against the support portion 31. The fixed guide rail 1 is provided with a guide groove 8, and the toothed roller 42 is provided between the guide groove 8 and the wedge block 3. The support portion 31 is provided with a mounting hole 32 for inserting the bolt 41. The diameter of the mounting hole 32 is larger than the outer diameter of the bolt 41, and smaller than the diameter of the sliding washer 6. One end of the compression spring 5 abuts against the stop pin 44, and the other end of the compression spring 5 abuts against the sliding washer 6. The toothed rollers 42 are arranged in pairs on rollers 43; the wedge block 3 is provided with an inclined surface 33, and an angle is formed between the inclined surface 33 and the inner wall of the guide groove 8; the toothed rollers 42 are arranged near the inclined surface 33. The angle between the inclined surface 33 and the inner wall of the guide groove 8 is less than the self-locking rotation angle of the toothed rollers 42; in the non-free-fall state, a gap is provided between the toothed rollers 42 and the guide groove 8, allowing the movable guide rail 2 to move up and down relative to the fixed guide rail 1; in the free-fall state, the toothed rollers 42 move upward along the inclined surface 33, and the gap between the guide groove 8 and the wedge block 3 disappears. The fixed guide rail 1 and the movable guide rail 2 are arranged parallel to each other and are both installed; the locking bolt assembly 4 moves in the vertical direction.

[0026] The specific operation process of the embodiment is as follows, the lock bolt assembly 4 has a certain weight, the compression spring 5 is in a compressed state in the default state, at this time the fixed guide rail 1 and the movable guide rail 2 are in a non-free fall state; at this time the bolt column 41 is inserted in the mounting hole 32, the toothed roller 42 abuts against the inclined surface 33 of the wedge block 3; in this way, the gap between the toothed roller 42 and the guide groove 8 of the fixed guide rail 1 is left, the lock bolt assembly 4 is in an unlocked state, and the movable guide rail 2 can freely slide up and down relative to the fixed guide rail 1; when the movable guide rail 2 is in a falling state, at this time the movable guide rail 2 approaches free fall motion; the lock bolt assembly 4 will be in a weightless state, the compression spring 5 automatically retreats to make the lock bolt assembly 4 move upward as a whole; when the lock bolt assembly 4 moves upward, the toothed roller 42 moves along the inclined surface 33 of the wedge block 3, and finally the toothed roller 42 abuts against the inner wall of the guide groove 8; at this time, the gap between the toothed roller 42 and the guide groove 8 of the fixed guide rail 1 disappears, the lock bolt assembly 4 is in a locked state, thereby preventing the movable guide rail 2 from continuing to fall. At this time, the movable guide rail 2 can still be lifted by an external force.

[0027] The specific embodiments described in the specification are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A fall prevention mechanism, comprising a fixed guide rail (1) and a movable guide rail (2), characterized in that: The movable guide rail (2) is slidably mounted on the fixed guide rail (1); a wedge block (3) is fixedly mounted on the movable guide rail (2); the wedge block (3) is provided with a locking bolt assembly (4) capable of moving up and down relative to the wedge block; the locking bolt assembly (4) comprises a bolt post (41) and a toothed roller (42); the toothed roller (42) and the bolt post (41) are rotatably connected, and the toothed roller (42) is arranged between the fixed guide rail (1) and the movable guide rail (2); a compression spring (5) and a sliding washer (6) are sleeved and mounted on the bolt post (41).

2. The anti-fall mechanism according to claim 1, characterized in that: A plurality of guide wheels (7) rotatably connected to the movable guide rail (2) are provided at both ends thereof, and a pair of guide grooves (8) are provided on the fixed guide rail (1); the guide grooves (8) extend along the axial direction of the fixed guide rail (1), and the guide wheels (7) are slidably mounted in the guide grooves (8).

3. The anti-fall mechanism according to claim 2, characterized in that: The guide wheels (7) are symmetrically distributed on the left and right sides of the movable guide rail (2), and the guide grooves (8) are symmetrically distributed on the left and right sides of the fixed guide rail (1); the outer contours of the guide wheels (7) and the outer contours of the guide grooves (8) are matched with each other, and the left-right spacing between the two guide wheels (7) and the left-right spacing between the two guide grooves (8) are matched with each other.

4. The anti-fall mechanism according to claim 1, characterized in that: The locking bolt assembly (4) further comprises a roller (43) and a limiting pin (44); the roller (43) is fixedly mounted on the bolt column (41), and the roller (43) is provided with a toothed roller (42) rotatably connected thereto; the bolt column (41) is provided with a limiting pin (44) fixedly connected thereto; a support portion (31) is provided at the bottom of the wedge block (3), a compression spring (5) is provided between the support portion (31) and the limiting pin (44), a sliding washer (6) is provided at the end of the compression spring (5), and the sliding washer (6) abuts against the support portion (31); a guide groove (8) is provided on the fixed guide rail (1), and the toothed roller (42) is arranged between the guide groove (8) and the wedge block (3).

5. The anti-fall mechanism according to claim 4, characterized in that: The support portion (31) is provided with a mounting hole (32) for inserting the bolt (41); the diameter of the mounting hole (32) is larger than the outer diameter of the bolt (41), and the diameter of the mounting hole (32) is smaller than the diameter of the sliding washer (6); one end of the compression spring (5) abuts against the limit pin (44), and the other end of the compression spring (5) abuts against the sliding washer (6).

6. The anti-fall mechanism according to claim 4, characterized in that: The toothed rollers (42) are arranged in pairs on the roller shaft (43); an inclined surface (33) is provided on the wedge block (3), and an angle is provided between the inclined surface (33) and the inner wall of the guide groove (8); the toothed rollers (42) are arranged close to the inclined surface (33).

7. The anti-fall mechanism according to claim 6, characterized in that: The angle between the inclined surface (33) and the inner wall of the guide groove (8) is smaller than the self-locking rotation angle of the toothed roller (42); in the non-free-fall state, a gap is provided between the toothed roller (42) and the guide groove (8), and the movable guide rail (2) can move up and down relative to the fixed guide rail (1); in the free-fall state, the toothed roller (42) moves upward along the inclined surface (33) and the gap between the guide groove (8) and the wedge block (3) disappears.

8. The anti-fall mechanism according to claim 1, characterized in that: The fixed guide rail (1) and the movable guide rail (2) are arranged parallel to each other, and both the fixed guide rail (1) and the movable guide rail (2) are arranged and installed; the locking bolt assembly (4) moves along the vertical direction.

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