TWI736432B - Fall arrester - Google Patents

Abstract

An anti-dropping device includes a bracket, a turntable, a braking device and a dust cover. The turntable is pivoted on the bracket and located in the bracket. The turntable includes a main body and at least one normally-open ratchet, wherein the main body has a receiving part on which a steel cable is wound and a setting part. The at least one normally open ratchet is pivotally arranged on the setting part, and the braking device is fixedly connected to the bracket and located between the bracket and the setting part. When the turntable is quickly rotated by the force of the steel cable being pulled out, the normally open ratchet will pivot so that a part of it abuts against a part of the braking device to prevent the turntable from rotating. The dustproof cover is fixedly arranged on the setting part, and the at least one normally open ratchet and the braking device are located therein. In this way, the dust cover can prevent dust from affecting the drive of the normally open ratchet and the brake device, ensuring the safety of use.

Description

Fall arrester

The present invention relates to an anti-dropping device; in particular, it refers to an anti-dropping device with a dust-proof effect.

Generally, when working in high-altitude places, the staff must be equipped with a fall arrester. One end of the anti-dropping device will be connected to a support, and the steel cable or safety belt in the anti-dropping device will be fastened to the body of the worker, so that when the worker accidentally falls from a height, the sudden falling force will be affected. The braking device in the fall arrester is driven to prevent the wire rope or seat belt from being pulled out by the falling force, or to reduce the speed at which the wire rope or seat belt is pulled out, so as to maintain the safety of the staff.

Most of the conventional fall arresters also include a shell to prevent external dust or small impurities from entering the inside of the fall arrester, and the shell has an opening for the steel cable or safety belt to enter and exit the shell. However, the steel cable or the seat belt is easy to bring dust or small impurities from the outside into the shell during the process of winding back into the shell, and these substances are easy to accumulate in the braking device, and then affect the driving effect of the braking device. It may even cause the braking device to jam and cause the anti-dropping device to lose its original emergency locking function, and the work safety cannot be ensured. From this, it can be seen that the conventional anti-dropping device still has problems that need to be improved, and there is room for improvement.

In view of this, the object of the present invention is to provide a fall arrester, which has the characteristic of preventing dust from accumulating in the braking device of the fall arrester and the at least one normally open ratchet to affect its operation.

In order to achieve the above objective, the fall arrester provided by the present invention includes a bracket, a turntable, a braking device and a dust cover. The bracket has a first arm and a second arm; the turntable is pivoted on the bracket and located between the two arms; the turntable includes a body and at least one normally open ratchet, wherein the body has a The accommodating part is used for winding a flexible elongated body and a setting part; the at least one normally open ratchet has a first abutting part, and the at least one normally open ratchet is pivotally arranged On the setting part, when the turntable rotates at a predetermined speed or more, the pivot that generates the first abutting part moves from a first position to a second position; the braking device has a convex part , And fixedly connected to the first arm with the convex portion, so that the braking device is located between the first arm and the setting portion; the braking device further has at least one second abutting portion for securing the first An abutting portion is located at the second position on the rotation path formed by the rotation of the turntable, and can abut the first abutting portion to prevent the rotation of the turntable; the dust cover is fixedly arranged on the The setting part is located between the setting part and the first arm; a closed space is formed between the dust cover and the setting part, so that the at least one normally open ratchet and the braking device are located therein; the dust cover There is a hole, and the convex part penetrates the hole.

The effect of the present invention is that the dust cover covers the braking device and the at least one normally open ratchet, so that the braking device and the at least one normally open ratchet are located in the enclosed space formed between the dust cover and the setting part, avoiding Dust or small impurities accumulate on the braking device and the at least one normally-open ratchet and affect its operation.

〔this invention〕

1: Anti-dropping device

100: The body of the anti-dropping device

10: Bracket

12: First arm

14: second arm

16: top plate

17: Ring

18: connecting rod

19: pivot axis

20: turntable

22: body

222: accommodating part

222a: reduced diameter part

222b: Enlarged diameter part

224: Setting Department

224a: outer wall

24: Normally open ratchet

242: The first abutment part

25: spring

30: Braking device

32: Ratchet disc

322: Ratchet

322a: The second abutment part

34: Central shaft plate

342: Convex

36: Cover disk

36a: Through hole

40: Dust cover

42: main cover

42a: hole

44: auxiliary cover

50: steel cable

200: shell

201: side shell

200a: Hanging hole

200b: Through hole

O: Center of gravity

A: Enclosed space

S: accommodating space

P1: first position

P2: second position

Fig. 1 is a perspective view of a fall arrester according to a preferred embodiment of the present invention.

Figure 2 is a partial exploded view of Figure 1.

Fig. 3 is a perspective view of the body of the fall arrester according to a preferred embodiment of the present invention.

Fig. 4 is a partial exploded view of Fig. 3.

Fig. 5 is a right side view of the body of the anti-dropping device of the above preferred embodiment, with the first arm removed.

Fig. 6 is similar to Fig. 5, revealing that when the turntable rotates abruptly, the first abutting portion is located at the second position and abuts the second abutting portion.

Figure 7 is similar to Figure 6, revealing that the speed of the turntable has slowed down.

In order to explain the present invention more clearly, the preferred embodiments are described in detail in conjunction with the drawings as follows. Please refer to Figures 1 and 2 for a preferred embodiment of the fall arrester 1 of the present invention. The fall arrester 1 includes a fall arrester body 100 and a housing 200, wherein the housing 200 is composed of two half shells. 201 is combined and formed, and the anti-dropper body 100 is located in the accommodating space surrounded by the two side half-shells 201. The housing 200 has a hanging hole 200a on the upper part and a through hole 200b on the lower part.

3 and 4, the main body 100 of the fall arrester includes a bracket 10, a turntable 20, a braking device 30, and a dust cover 40. The bracket 10 has a first support arm 12, a second support arm 14, a top plate 16 and a connecting rod 18. The upper and lower parts of the first arm 12 and the second arm 14 are respectively fixedly connected to each other by the top plate 16 and the connecting rod 18, and the first arm 12, the second arm 14, the The top plate 16 and the connecting rod 18 surround an accommodating space S. In addition, the top plate 16 is provided with a hoisting ring 17, which passes through the hanging hole 200a and can be hung or tied to a support. The support can be, but is not limited to, steel. Beam or cable.

The turntable 20 is located in the accommodating space S, a pivot shaft 19 passes through the center of the turntable 20, and two ends of the pivot shaft 19 are fixedly connected to the first arm 12 and the second arm 14, respectively, From this, it can be seen that the turntable 20 is pivoted to the support 10 by the pivot shaft 19, and thus is rotatably located in the accommodating space S relative to the support 10. The turntable 20 includes a main body 22 and two normally open ratchet teeth 24, wherein the main body 22 has a receiving portion 222 and a setting portion 224.

The accommodating portion 222 can be divided into a reduced diameter portion 222 a recessed in the radial direction of the main body 22 in the axial direction, and an enlarged diameter portion 222 b expanded in the radial direction of the main body 22. The reduced diameter portion 222a of the accommodating portion 222 is connected to the enlarged diameter portion 222b of the accommodating portion 222 at one side edge in the axial direction, and the reduced diameter portion 222a and the enlarged diameter of the accommodating portion 222 in this embodiment The part 222b is integrally formed, but not limited to this. The other side edge of the reduced diameter portion 222a of the accommodating portion 222 in the axial direction is detachably combined with the setting portion 224. However, in other practical applications, the accommodating portion 222 and the setting portion 224 are also detachable. Can be a one-piece molding. In this embodiment, a steel cable 50 is wound around the outer periphery of the reduced diameter portion 222a of the accommodating portion 222, and the steel cable 50 is limited between the enlarged diameter portion 222b of the accommodating portion 222 and the setting portion 224, and Its free end is exposed outside the housing 200 through the through hole 200b, and can be pulled to drive the turntable 20 to rotate. The accommodating portion 222 is not limited to being wound by the steel cable 50, and may also be other flexible elongated bodies, such as cables or safety belts.

The two normally open ratchet teeth 24 of the turntable 20 are pivoted on the outer wall 224a of the setting portion 224, and are respectively located on opposite sides of the outer wall 224a. Each of the normally open ratchet teeth 24 has a first abutting portion 242, each of the first abutting portions 242 is located at the tip of each of the normally open ratchet teeth 24, and each of the normally open ratchet teeth 24 is opposite to the first A return spring 25 is connected to one end of the abutment portion 242. One end of each of the return springs 25 is connected to the normally open ratchet 24, and the other end is fixed to the outer wall 224a of the setting portion 224. In this embodiment, it is sleeved and fixed to the outer wall The studs on 224a can be fixed on the outer wall 224a. The return spring 25 is used to maintain each of the normally open ratchet teeth 24 at a first position P1. In other words, the normally open ratchet teeth 24 can be maintained in the normally open state without contacting the braking device 30 without any external force. . 5 and 6, when the normally open ratchet 24 receives more than a predetermined external force, the normally open ratchet 24 can resist the restoring force given by the return spring 25 and pivot to make the first abutting portion 242 It can move from the first position P1 to a second position P2. The distance between the first position P1 and the center of the pivot shaft 19 is greater than the distance between the second position P2 and the center of the pivot shaft 19.

The braking device 30 is sleeved on the pivot shaft 19 and located between the first arm 12 and the setting portion 224. The braking device 30 includes a ratchet disk 32, a central shaft disk 34 and a cover disk 36. The perimeter of the ratchet disk 32 has a plurality of ratchet teeth 322, the tip of each ratchet tooth 322 constitutes a second abutting portion 322a, and the distance between each second abutting portion 322a and the center of the pivot shaft 19 is fixed. , And greater than the distance between the first abutting portion 242 and the center of the pivot shaft 19 when the first abutting portion 242 is located at the second position P2, which means that each of the second abutting portions 322a is located at the first abutting portion 242 at the second position P2 Sometimes along the rotation path formed by the rotation of the turntable 20. The cover plate 36 has a through hole 36a. The central shaft disk 34 has a convex portion 342, which is formed to protrude outward from the disk surface of the central shaft disk 34 along its central axis, and is inserted into the through hole 36a and fixed to the first branch. On the arm 12. A part of the central shaft disk 34 is located between the ratchet disk 32 and the cover disk 36, and the cover disk 36 is fixed on the ratchet disk 32, so that the two sides of the center shaft disk 34 and the ratchet disk 32 and the The cover disk 36 is in frictional contact to form a friction reduction device, so that the ratchet disk 32 and the cover disk 36 can frictionally rotate relative to the fixed central shaft disk 34.

The dust cover 40 includes a main cover 42 and two auxiliary covers 44, wherein a hole 42a is opened in the center of the main cover 42, and the two auxiliary covers 44 are connected to the periphery of the main cover 42 and are located Opposite ends on both sides. The dust cover 40 is fixedly arranged on the setting part 224 Is located on the outer wall 224a of the bracket, and is located between the setting portion 224 and the first arm 12, and the aforementioned protrusion 342 penetrates the hole 42a to be fixedly connected to the first arm 12. A closed space A is formed between the dust cover 40 and the setting portion 224, the braking device 30 is located in the main cover 42, and the two normally open ratchets 24 are located in the two auxiliary covers 44 respectively. It is worth mentioning that the contour shape of the hole 42a of the dust cover 40 corresponds to the outer contour shape of the convex portion 342, so that the gap formed between the hole 42a and the convex portion 342 is prevented from being too large, and dust enters from the gap. In the enclosed space A; or, avoiding the tight fit between the hole 42a and the convex portion 342 is not conducive to the rotation of the dust cover 40 relative to the convex portion 342.

Therefore, referring to FIGS. 5 to 7 continuously, when using the present invention, the lifting ring 17 on the bracket 10 is fixed to the support, and the exposed free end of the steel cable 50 is tied to the body of the aerial worker. When the operator is working normally, the steel cable 50 will be slowly pulled out of the housing 200, and the normally open ratchet 24 will maintain the first abutting portion 242 at the first position due to the return force of the return spring 25 P1. If an operator accidentally falls from a height, the steel cable 50 will be pulled out of the housing 200 abruptly and drive the turntable 20 to rotate at a predetermined speed or more, so that the center of gravity O of each normally open ratchet 24 will be rotated by the turntable 20 The generated centrifugal force is thrown outward, and the centrifugal force is greater than the return force of the return spring 25, so that the first abutment portion 242 of each of the normally open ratchet teeth 24 pivots from the first position P1 to the second position P2, Thereby, the first abutment portion 242 on the rotating disk 20 can abut the second abutment portion 322a of the braking device 30, and the ratchet disk 32 and the cover driven by the first abutment portion 242 The friction force between the disk 36 and the central shaft disk 34 fixed on the first arm 12 causes the rotation speed of the turntable 20 to gradually slow down, thereby preventing the turntable 20 from rotating. In this embodiment, the change in the length of the left arrow in FIGS. 6 and 7 represents the decrease in the rotation speed of the turntable 20. In addition, when the centrifugal force generated by the rotation of the turntable 20 on the normally open ratchet 24 is less than the return force of the return spring 25, the first abutting portion 242 will pivot from the second position P2 Swing back to the first position P1. However, in other practical applications, when the first abutting portion 242 abuts the second abutting portion 322a, the turntable 20 is immediately stopped from rotating.

Although the number of normally open ratchet teeth 24 in this embodiment is two, it is not limited to this. One normally open ratchet can be used with the braking device to prevent the turntable from rotating, even more than three. The normally open ratchet. For example, in another embodiment, the number of normally open ratchet teeth is three, the distance between the normally open ratchet teeth and the pivot axis is the same, and the distance between any two adjacent normally open ratchet teeth is the same. In this way, the bonding strength between the normally open ratchet teeth and the ratchet disc can be strengthened. In addition, the number of auxiliary covers of the dust-proof cover in the above embodiment is also increased to three, and each auxiliary cover covers a normally open ratchet, so as to achieve the purpose of dust prevention. It can be seen that there is a positive correlation between the number of normally-open ratchets and the number of auxiliary covers, and the design of the main cover with auxiliary cover instead of the one-piece dust cover is designed to save more materials for the production of the dust cover cost.

In summary, with the design of the dust cover covering the braking device and the normally open ratchets, external dust can be prevented from affecting the anti-dropping mechanism of the anti-dropping device, and the safety of the product can be maintained.

The above are only the preferred and feasible embodiments of the present invention. Any equivalent changes made by applying the specification of the present invention and the scope of the patent application should be included in the patent scope of the present invention.

1: Anti-dropping device

17: Ring

50: steel cable

200: shell

201: side shell

200a: Hanging hole

Claims (4)

A fall arrester, including: A bracket with a first arm and a second arm; A turntable is pivoted on the bracket and located between the two arms; the turntable includes a body and at least one normally open ratchet, wherein the body has a accommodating portion for a flexible strip The body is wound on it, and a setting part; the at least one normally open ratchet has a first abutting part, and the at least one normally open ratchet is pivoted on the setting part and tied to the turntable at a predetermined value or more When the rotational speed rotates, a pivot whose first abutting portion moves from a first position to a second position is generated; A braking device has a convex portion, and the convex portion is fixedly connected to the first arm, so that the braking device is located between the first arm and the setting portion; the braking device further has at least a second The abutment portion is positioned on the rotation path formed by the rotation of the turntable when the first abutment portion is located at the second position, and can abut against the first abutment portion to prevent the rotation of the turntable ； A dust cover is fixedly arranged on the setting part and located between the setting part and the first arm; a closed space is formed between the dust cover and the setting part, so that the at least one normally open ratchet and the The braking device is located therein; the dust-proof cover has a hole, and the convex part penetrates the hole. The fall arrester according to claim 1, wherein the number of the at least one normally open ratchet is two; the two normally open ratchets are respectively arranged on the outer wall of the setting part and are located on opposite sides. The fall arrester according to claim 2, wherein the dust cover includes a main cover and two auxiliary covers, and the two auxiliary covers are connected to the periphery of the main cover and are located at opposite two ends; wherein the The braking device is located in the main cover, and the two normally open ratchets are located in the two auxiliary covers. The fall arrester according to claim 1, wherein the contour shape of the hole of the dust cover corresponds to the outer contour shape of the convex portion.

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