TWI755235B - fall arrester - Google Patents

Abstract

A fall arrester includes a bracket, a turntable and a braking device; the turntable is pivoted on the bracket; the turntable includes a main body and a normally open ratchet; On the setting part of the main body; the braking device has a second abutting part, when the turntable rotates at a speed greater than or equal to a predetermined speed, the first abutting part abuts on the second abutting part, preventing the turntable from rotating; when the turntable rotates at a speed less than the predetermined speed During rotation, the center of gravity of each of the normally open ratchets is in contact with the outer edge of the second abutting portion, and swings as the outer diameter of the second abutting portion changes. In this way, the normally open ratchet can avoid the influence of dust to ensure the safety of use.

Description

fall arrester

The present invention relates to a fall arrester; in particular, it refers to a fall arrester with a double locking system.

As the floors of the current building are getting higher and higher, the risk of work increases with the height of the working position, whether for construction workers during construction or for personnel cleaning and painting the exterior walls after the construction is completed. When working at heights, people are often equipped with a fall arrester including a safety belt. The fall arrester is fixed on a support, and the safety belt is fastened to the person to prevent the person from falling further and ensure the safety of the person. Safety.

The traditional fall arrester includes a rotating member, a safety belt and a braking device, wherein one end of the safety belt is connected to the rotating member and is wound on the rotating member; the braking device includes a braking disc, a braking block and a braking device. Stopper, the brake disc is connected to the rotating piece and rotates coaxially with the rotating piece, the brake block is pivoted on the brake disc, and the brake block is thrown out by the centrifugal force generated by the instantaneous rotation of the brake disc and is stuck with the stopper to limit the rotation of the rotating member. When the personnel are in the hanging operation, when the personnel accidentally fall, the braking device can play the role of emergency locking to stop the rotation of the rotating parts, so as to avoid the continuous falling of the personnel.

However, most of the traditional fall arresters have only one set of brake blocks, and when the single brake block rotates to different positions (such as the highest point or the lowest point), the centrifugal force thrown from the brake block will be resisted due to gravity or spring tension. Due to the action of the pin, the single brake block cannot be positively engaged with the stopper, but instead continues to rotate, causing the person to continue to fall, causing injury and life hazard.

In addition, the places where the fall arrester is used are mostly in a dusty state, and the dust is easily attached to the braking device, especially the pivot joint of the brake block, so that the brake block cannot be thrown out in an emergency, causing emergency The locking function is disabled.

In order to reduce the impact of dust on the fall arrester, a fall arrester with an outer casing can also be seen in the market to isolate the dust from the outer casing. However, the insulation effect of the shell is still very limited, and the dust in the environment may still adhere to the seat belt exposed outside the shell, and enter the shell with the retraction of the seat belt, and then attach to the pivot of the brake block, causing braking Blocks cannot be pivoted.

In view of this, the purpose of the present invention is to provide a fall arrester, the user can pull the seat belt in advance, and the normally open ratchet can be known from the vibration generated when the normally open ratchet is pivoted to know that the normally open ratchet is not stuck, so as to confirm that the safety belt is not blocked. The sinker can operate normally. The fall arrester provided by the present invention includes a plurality of normally open ratchet teeth, and when the normally open ratchet teeth are rotated to different positions (such as the highest point or the lowest point), each of the normally open ratchet teeth can be matched with the normally open ratchet teeth respectively. The external elastic force or gravity generated by the contact between the teeth and the braking device has a synergistic effect on the centrifugal force thrown from the brake block (that is, the direction of the force is the same), so that each of the normally open ratchet teeth can indeed be engaged with the braking device to prevent the turntable from rotating. , so that the person stops falling or the falling speed is slowed down, so as to protect the life safety of the person.

In order to achieve the above purpose, the fall arrester provided by the present invention includes a bracket, a turntable and a braking device; the bracket has a first arm and a second arm; the turntable is pivoted on the bracket and located in the Between the first support arm and the second support arm; the turntable includes a main body and a plurality of normally open ratchet teeth, wherein the main body has an accommodating part and a setting part, the accommodating part is used for a flexible The long body is wound on it; each of the normally open ratchets has a first abutting part and a pivot, and the normally open ratchets are pivoted on the setting part by the pivot, and are tied to the When the turntable rotates at a speed greater than or equal to a predetermined rotation speed, the first abutting portion moves from a first position A pivot to a second position; the braking device has a protruding portion, and the braking device is fixedly coupled to the first arm with the protruding portion, so that the braking device is located between the first arm and the turntable Between the setting parts; the braking device further has a plurality of second abutting parts, and the second abutting parts are formed when the first abutting part is located at the second position and formed along with the rotation of the turntable On the rotation path, and can abut with the first abutting portion to stop the rotation of the turntable; wherein, each of the normally open ratchet teeth has a center of gravity, and the center of gravity of each of the normally open ratchet teeth is the same as The first abutting parts are located on different sides of the pivot; when the turntable rotates at a speed less than the predetermined rotation speed, the center of gravity of each of the normally open ratchet teeth is in contact with a part of the second abutting parts The outer edges are in contact and oscillate as the outer diameter of a portion of the second abutting portions changes.

The effect of the present invention is that the user can pull the safety belt of the fall arrester in advance, and the normally open ratchet can be known from the vibration generated when the normally open ratchet is pivoted to know that the normally open ratchet is not stuck, so as to confirm that the fall arrester can operate normally . The fall arrester provided by the present invention includes a plurality of normally open ratchet teeth, and when the normally open ratchet teeth are rotated to different positions (such as the highest point or the lowest point), each of the normally open ratchet teeth can be matched with the normally open ratchet teeth respectively. The external elastic force or gravity generated by the contact between the teeth and the braking device has a synergistic effect on the centrifugal force thrown from the brake block (that is, the direction of the force is the same), so that each of the normally open ratchet teeth can indeed be engaged with the braking device to prevent the turntable from rotating. , so that the person stops falling or the falling speed is slowed down, so as to protect the life safety of the person.

〔this invention〕

1: Fall arrester

10: Bracket

12: The first arm

14: Second arm

20: Turntable

21: Ontology

212: Setup Department

214: accommodating part

22, 22a, 22b: Normally open ratchet

221: Pivot

222: First Abutment

224: Center of Gravity

225: Roller

226: Elastic

30: Braking device

302: Second abutment

31: convex part

G: center of gravity

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

FIG. 2 is a partially exploded view of FIG. 1 .

3 is a front view of a fall arrester according to a preferred embodiment of the present invention, with the first arm of the bracket removed.

4 is a partial enlarged view of the upper normally open ratchet tooth of the fall arrester body of FIG. 3 , wherein the center of gravity of the upper normally open ratchet tooth contacts the outer edge of the braking device.

5 is a partial enlarged view of the upper normally open ratchet tooth of the fall arrester body of FIG. 4 , wherein the braking device rotates, and the center of gravity of the upper normally open ratchet tooth continuously contacts the outer edge of the braking device.

6 is a partial enlarged view of the upper normally open ratchet tooth of the fall arrester body of FIG. 5 , wherein the braking device rotates, and the center of gravity of the upper normally open ratchet tooth continuously contacts the outer edge of the braking device.

FIG. 7 is a partial enlarged view of the lower normally open ratchet of the fall arrester body of FIG. 3 , wherein the center of gravity of the lower normally open ratchet contacts the outer edge of the braking device.

8 is a partial enlarged view of the upper normally open ratchet tooth of the fall arrester body of FIG. 4 , wherein the braking device rotates, and the center of gravity of the lower normally open ratchet tooth continuously contacts the outer edge of the braking device.

9 is a partial enlarged view of the upper normally open ratchet tooth of the fall arrester body of FIG. 5 , wherein the braking device rotates, and the center of gravity of the lower normally open ratchet tooth continuously contacts the outer edge of the braking device.

In order to describe the present invention more clearly, preferred embodiments are given and described in detail with the drawings as follows. Please refer to FIGS. 1 to 3. FIG. 1 is a perspective view of a fall arrester 1 according to a preferred embodiment of the present invention; FIG. 2 is a partially exploded view of FIG. 1; Front view of the sinker 1 with the first arm 12 of the bracket 10 removed. In FIGS. 1 to 3 , the fall arrester 1 includes a bracket 10 , a turntable 20 and a braking device 30 .

The stand 10 has a first support arm 12 and a second support arm 14 . The turntable 20 is pivoted on the bracket 10 and located between the first support arm 12 and the second support arm 14 .

The turntable 20 includes a main body 21 and a plurality of normally open ratchet teeth 22 , wherein the main body 21 has a setting portion 212 and an accommodating portion 214 . The accommodating portion 214 is used for a flexible elongated body (not shown) to be wound thereon. Each of the normally open ratchet teeth 22 has a first abutting portion 222 and a pivot shaft 221, and the normally open ratchet teeth 22 The ratchet teeth 22 can rotate with the turntable 20 by pivoting the pivot 221 on the setting portion 212 . When the turntable 20 rotates at a speed greater than or equal to a predetermined rotation speed, the first abutting portion 222 is automatically generated. A pivot that moves from a first position to a second position. It is worth mentioning that when the turntable 20 rotates at less than the predetermined rotational speed, the first abutting portions 222 of the normally open ratchet teeth 22 will not constantly contact the second abutting portions 302 of the braking device 30 The abutting relationship is maintained, and at this time, the normally open ratchet teeth 22 are in a normally open state.

The braking device 30 has a protruding portion 31 , and the braking device 30 is fixedly coupled to the first arm 12 by the protruding portion 31 , so that the braking device 30 is located in the setting of the first arm 12 and the turntable 20 between sections 212. The braking device 30 further has a plurality of second abutting portions 302 , and the second abutting portions 302 are disposed in the rotation formed by the rotation of the turntable 20 when the first abutting portion 222 is at the second position. on the path, and can abut with the first abutting portion to prevent the rotation of the turntable.

In FIG. 3 , each of the normally open ratchet teeth 22a, 22b further has a center of gravity portion 224, and the center of gravity portion 224 and the first abutting portion 222 of each of the normally open ratchet teeth 22a, 22b are located on the pivot shaft 221 the opposite side. In the embodiment of the present invention, in a natural state and without the resistance of the second abutting portion 302 , each of the normally open ratchet teeth 22 a and 22 b is inclined from the first abutting portion 222 to the center of gravity portion 224 .

When the turntable 20 rotates at less than the predetermined rotational speed, the center of gravity portion 224 of the normally open ratchet teeth 22a, 22b respectively contacts the outer edge of a portion of the second abutting portions 302, and follows the The outer diameter of the second contact portion 302 changes and swings.

In a preferred embodiment of the present invention, the number of the normally open ratchet teeth 22 is two, including the normally open ratchet teeth 22a, 22b; the two normally open ratchet teeth 22a, 22b are disposed on the surface of the setting portion 212, They are symmetrically arranged on two opposite sides of the center of the turntable 20 . In practice, the number of the normally open ratchet teeth 22 can be more than two, as long as they are arranged in a balanced manner relative to the center of the turntable 20 , for example, the center of the turntable 20 is the center of gravity and arranged in a regular polygon.

In a preferred embodiment of the present invention, the body of each of the normally open ratchet teeth 22a, 22b includes the center of gravity portion 224 and the first abutting portion 222, and each of the normally open ratchet teeth 22a, 22b includes an elastic member 226 ,Should One end of the elastic member 226 is fixed to the body of each of the normally open ratchet teeth 22 a and 22 b , and the other end of the elastic member 226 is fixed to the setting portion 212 of the turntable 20 . In addition, in an embodiment of the present invention, one end of the elastic member 226 is fixed to the center of gravity portion 224 of the body of each of the normally open ratchet teeth 22a, 22b, and the other end of the elastic member 226 is fixed to the setting portion of the turntable 20 212 , the center of gravity 224 is located between the pivot 221 and the elastic member 226 . When the turntable 20 rotates at less than the predetermined rotational speed, the center of gravity portion 224 of the normally open ratchet teeth 22a, 22b is respectively connected to a portion of the second abutting portions 302 by the elastic pieces 226 . The outer edges are in contact and swing within a certain range as the outer diameters of the second abutting portions 302 change.

In addition, when each of the normally open ratchet teeth 22a, 22b swings as the outer diameter of a portion of the second abutting portions 302 changes, the elastic member 226 provides recovery of the swing of each of the normally open ratchet teeth 22a, 22b and prevent the gravity center portion 224 of each of the normally open ratchet teeth 22a, 22b from repeatedly and directly hitting the outer edge of the second abutting portion 302 of the braking device 30, resulting in structural damage of the fall arrester 1 . It is worth mentioning that the elastic member 226 provides an upward pulling force to the gravity center portion 224 of the normally open ratchet tooth 22b located below, so as to prevent the gravity center portion 224 of the normally open ratchet tooth 22b located below from directly hanging down, Therefore, when the turntable 20 rotates at less than the predetermined rotation speed, the first abutting portion 222 of the normally open ratchet 22b located below abuts the second abutting portion 302 of the braking device 30, resulting in a fall arrester. 1 Abnormal braking occurs.

Please refer to FIG. 3 to FIG. 9 together. In the longitudinal direction of the fall arrester 1, when the turntable 20 rotates, one of the normally open ratchet teeth 22a, 22b is located at the normally open ratchet teeth 22a, 22b. Above the other 22b of the 22b, wherein the center of gravity portion 224 of the normally open ratchet tooth 22a located above remains in contact with the outer edge of a portion of the second abutting portions 302, and follows the second abutting portions 302. The outer diameter of a part of the contact part 302 changes and oscillates. In FIGS. 4 to 9 , the center of gravity G of each of the normally open ratchet teeth 22a, 22b is located at the center of gravity portion 224, so in a natural state, the center of gravity portion 224 of the normally open ratchet tooth 22a located above maintains the The outer edge of a part of the second abutting parts 302 contacts and swings as the outer diameter of a part of the second abutting parts 302 changes; and when the center of gravity of the normally open ratchet tooth 22b located below 224 series with these second contacts When the outer diameter of the other part of the part 302 changes and contacts the second abutting part 302 , the center of gravity part 224 of the normally open ratchet tooth 22b located below will swing downward slightly.

In FIGS. 4 and 7 , when the turntable 20 rotates at less than the predetermined rotational speed, the center of gravity portion 224 of the normally open ratchet tooth 22 a located above remains with the outer edge of a portion of the second abutting portions 302 contact, and the vertical distance between the highest point of a portion of the second abutting portions 302 and the lowest point of the center of gravity portion 224 of the normally open ratchet 22a located above is a first distance D1; The center of gravity of the normally open ratchet 22b is in contact with the outer edge of the other part of the second abutting parts, and the lowest point of the other part of the second abutting parts is in contact with the normally open The vertical distance between the highest points of the center of gravity of the ratchet teeth is a second distance; the first distance D1 is greater than the second distance D2.

Therefore, when the turntable 20 rotates at less than the predetermined rotational speed, the center of gravity portion 224 of the normally open ratchet 22a located above will significantly collide with the second abutting portions compared to the normally open ratchet 22b located below One of 302 , springs upward, and resists the gravitational force that pushes the center of gravity 224 downward, as shown in FIGS. 4-6 .

Thereby, the fall arrester 1 of a preferred embodiment of the present invention can avoid the problem of the normally open ratchet teeth 22a, 22b being stuck due to dust and sand, thereby improving the safety of the fall arrester 1 in use. In addition, in a natural state, the center of gravity portion 224 of the normally open ratchet tooth 22a located above remains in contact with the outer edge of a portion of the second abutting portions 302, and along with the second abutting portions 302 The outer diameter of one part of the abutting parts 302 changes and swings, and the first abutting part 222 of the normally open ratchet tooth 22b located below remains in contact with the outer edge of the other part of the second abutting parts 302 , and swings as the outer diameter of the other part of the second contact parts 302 changes; when the turntable 20 rotates at a speed greater than or equal to the predetermined rotation speed, the gravity center part 224 of the normally open ratchet tooth 22a located above is affected by The outer edge of a part of the second abutting portions 302 collides and bounces upward, and resists the gravity that pushes the center of gravity portion 224 downward, and at the same time causes the center of gravity portion 224 of the normally open ratchet 22a located above to bounce upward The acting force is in the same direction as the centrifugal force of the rotation of the turntable 20 and is greater than the pulling force of the elastic members 226 on the center of gravity 224, so that the center of gravity of the normally open ratchet 22a located above 224 is thrown out, at this time, the first abutting portion 222 of the normally open ratchet 22a located above moves from the first position to the second position and contacts the second abutting portion 302 of the braking device 30 contact to stop the rotation of the turntable 20 .

On the other hand, the gravity center portion 224 of the normally open ratchet tooth 22b located below is subjected to downward gravity, and the gravity is in the same direction as the centrifugal force of the rotation of the turntable 20 and is greater than the pulling force of the elastic members 226 on the gravity center portion 224 , so that the center of gravity portion 224 of the normally open ratchet 22b located below is thrown out, and the first abutting portion 222 of the normally open ratchet 22b located below and the second contact portion of the braking device 30 The abutting portion 302 abuts to stop the rotation of the turntable 20, thereby ensuring that the normally open ratchet teeth 22a, 22b can abut the second abutting portion 302 of the braking device 30 to maintain a normal braking effect, Avoid direct fall of the user and cause life hazard.

In a preferred embodiment of the present invention, the center of gravity portion 224 of each of the normally open ratchet teeth 22a, 22b includes a roller 225, and the roller 225 is used for contacting the outer edges of the second abutting portions 302, so that the Relatively smooth relative movement is generated between the center of gravity portion 224 and the second abutting portions 302 to prevent the center of gravity portion 224 of each of the normally open ratchet teeth 22a, 22b from repeatedly and directly hitting the second abutting portion of the braking device 30. The outer edge of the connecting portion 302 causes structural damage to the fall arrester 1 .

With the design of the present invention, the user can pull the safety belt of the fall arrester in advance, and can know that the normally open ratchet is not stuck by the vibration generated when the normally open ratchet is pivoted, so as to confirm that the fall arrester can operate normally. . The fall arrester provided by the present invention includes a plurality of normally open ratchet teeth, and when the normally open ratchet teeth are rotated to different positions (such as the highest point or the lowest point), each of the normally open ratchet teeth can be matched with the normally open ratchet teeth respectively. The external elastic force or gravity generated by the contact between the teeth and the braking device has a synergistic effect on the centrifugal force thrown from the brake block (that is, the direction of the force is the same), so that each of the normally open ratchet teeth can indeed be engaged with the braking device to prevent the turntable from rotating. , so that the person stops falling or the falling speed is slowed down, so as to protect the life safety of the person.

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

1: Fall arrester

10: Bracket

21: Ontology

212: Setup Department

22a, 22b: Normally open ratchet

221: Pivot

222: First Abutment

224: Center of Gravity

225: Roller

226: Elastic

30: Braking device

302: Second abutment

31: convex part

Claims (7)

A fall arrester, comprising: a bracket with a first support arm and a second support arm; a turntable pivoted on the support and located between the first support arm and the second support arm; the turntable It includes a main body and a plurality of normally open ratchet teeth, wherein the main body has an accommodating part and a setting part, and the accommodating part is used for a flexible elongated body to be wound on it; each of the normally open ratchet teeth The teeth have a first abutting portion and a pivot, and the normally open ratchet teeth are pivoted on the setting portion by the pivot to rotate with the turntable, and are tied to the turntable at a speed greater than or equal to a predetermined rotational speed During rotation, the first contact portion moves from a first position to a second position pivoting; a braking device is fixedly coupled to the first support arm, so that the braking device is located on the first support arm and the setting part of the turntable; the braking device further has a plurality of second abutting parts, and the second abutting parts are arranged when the first abutting part is at the second position and follow the turntable On the rotation path formed by the rotation, and can abut with the first abutting portion to stop the rotation of the turntable; wherein, each of the normally open ratchet teeth further has a center of gravity, and the center of gravity of each of the normally open ratchet teeth is located at the center of gravity, and the center of gravity of each of the normally open ratchets and the first abutting portion are located on different sides of the pivot; when the turntable rotates at a speed less than the predetermined rotation speed, each of the normally open ratchets The center-of-gravity part is in contact with the outer edge of a part of the second abutting parts, and swings as the outer diameter of a part of the second abutting parts changes. The fall arrester according to claim 1, wherein in a natural state and without the resistance of the second abutting portion, each of the normally open ratchet teeth is inclined toward the center of gravity from the first abutting portion. The fall arrester of claim 2, wherein in the longitudinal direction of the fall arrester, when the turntable rotates, one of the normally open ratchet teeth is located above the other one of the normally open ratchet teeth , when the turntable rotates at less than the predetermined rotational speed, the weight of the normally open ratchet located above The center part is kept in contact with the outer edge of a part of the second abutting parts, and the highest point of one part of the second abutting parts and the lowest point of the center of gravity of the normally open ratchet located above are between the The vertical distance between is a first distance; and the center of gravity of the normally open ratchet located below is in contact with the outer edge of another part of the second abutting parts, and one of the second abutting parts The vertical distance between the lowest point of the other part and the highest point of the center of gravity of the lower normally open ratchet is a second distance; the first distance is greater than the second distance. The fall arrester as claimed in claim 3, wherein when the turntable rotates at a speed greater than or equal to the predetermined rotational speed, the center of gravity of the normally open ratchet located above is affected by a portion of the second abutting portions. The edge collides and bounces upward, and is thrown out due to the centrifugal force of the rotation of the turntable, so that the first abutting portion of the normally open ratchet located above is pivoted from the first position to the second position, so that the The first abutting portion of the normally open ratchet located above is in contact with one of the second contact portions; at the same time, the center of gravity of the normally open ratchet located below is gravitated to hang down, and Due to the centrifugal force of the rotation of the turntable, the first contact portion of the normally open ratchet located below is pivoted from the first position to the second position, so that the normally open ratchet located below The first abutting portion is in contact with the other of the second abutting portions. The fall arrester of claim 1, wherein the center of gravity portion of each of the normally open ratchet teeth includes a roller, and the roller is used for contacting the outer edges of the second abutting portions. The fall arrester as claimed in claim 1, wherein each of the normally open ratchets includes an elastic piece, one end of the elastic piece is fixed to the body of the normally open ratchet, and the other end of the elastic piece is fixed to the body of the turntable on the settings section. The fall arrester according to claim 1, wherein the number of the normally open ratchet teeth is two; the two normally open ratchet teeth are arranged on the surface of the setting portion, and are symmetrically arranged opposite to the center of the circle of the turntable two sides.

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