DK2493579T3

DK2493579T3 - Fang Interior with speed-dependent clutch

Info

Publication number: DK2493579T3
Application number: DK10754283.9T
Authority: DK
Inventors: Kai Rinklake
Original assignee: Skylotec Gmbh
Priority date: 2009-10-30
Filing date: 2010-09-08
Publication date: 2016-08-01
Also published as: EP2493579A1; WO2011050881A1; DE202009014714U1; EP2493579B1

Description

[0001] The present invention relates to an anti-fall device, in particular a fall arrest runner, which accompanies a person who is to be secured on a movable or fixed guide serving as a safety device, in particular a safety rail, safety ladder or safety cable, with a housing on which a first shaft is mounted rotatably, and with at least one rolling device which is connected to the first shaft in a rotationally fixed manner, which is arranged in such a way that it rolls on the safety device when the anti-fall device moves along the safety device, said rolling device being connected with a friction coupling which, depending on a rotational speed of the rolling device, establishes, by means of friction, a force-transmitting connection with an eccentric, said eccentric being arranged and designed such that, on this force-transmitting connection with the rolling device being established, this presses against the safety device such that a friction-locking connection is established between the housing and the safety device which blocks a movement of the housing relative to the safety device, wherein the anti-fall device has a fastening lug for the attachment of a person who is to be secured, according to the preamble of claim 1.

[0002] Known from WO 98/02210 is an automatic fall arrest device which runs along a cable, whereby a roller is arranged in a cam and rolls along the cable. At a predetermined rotational speed of the roller, a spring-operated friction part exerts a braking moment on said roller, as a result of which the cam is moved in the direction of the cable and clamps the cable, so that the fall arrest device clamps tightly to the cable. In addition, a lever arm is provided which is connected with a user. This lever arm operates the cam in the direction of the cable, so that the cable is clamped if the user moves relative to the fall arrest device in a falling direction. This means that there are two triggers which cause the fall arrest device to clamp onto the cable in the event of a person secured to the fall arrest device falling. Due to the asymmetrical design of the cam around the same centre of rotation as the roller, the cam automatically presses against the cable in the clamping position when the cable comes under strain. However, this arrangement can only be used on a flexible cable and is unsuitable for use with a rigid safety device, for example a safety rail.

[0003] The invention is based on the problem of designing an anti-fall device of the aforementioned type in such a way that it can be used with any safety device with a smooth surface with a high level of functional reliability, and is simple to opérate.

[0004] This problem is solved according to the invention through an anti-fall device of the aforementioned type with the characterising features of claim 1. Advantageous embodiments of the invention are described in the other claims.

[0005] According to the invention, in an anti-fall device of the aforementioned type the eccentric is arranged on a second shaft arranged at a distance from the first shaft and is connected with this second shaft in a rotationally fixed manner, whereby at least one lever arm is connected on the one hand with the eccentric and on the other hand with a braking ring, said braking ring being arranged and designed such that the friction coupling establishes a force-transmitting connection between the rolling device and the braking ring.

[0006] This has the advantage that, using a particularly small friction coupling, powerful forces can be applied to the eccentric in order to rapidly arrest the movement of the anti-fall device relative to the safety device, whereby a high level of functional reliability is achieved with a simple structure and at the same time the anti-fall device only requires minimal maintenance. In addition, the anti-fall device according to the invention can be used on any type of safety device with a smooth surface.

[0007] A particularly simple mechanical structure is achieved in that the second shaft is mounted rotatably in the housing.

[0008] A particularly simple adjustability of a predetermined rotational speed of the rolling device at which a friction-locking connection is established with great forcé is achieved in that the friction coupling is designed as a centrifugal clutch.

[0009] An additional anti-fall safeguard effected through rotation of the eccentric around the second shaft is achieved in that a lever arm is provided which is connected with the second shaft in a rotationally fixed manner and which carries the fastening lug for the attachment of a person who is to be secured on a free end opposite the second shaft.

[0010] A particularly good friction-locking connection between the eccentric and the safety device is achieved in that the eccentric has one, two or more cams formed eccentrically in relation to the second shaft.

[0011] A particularly compact structure of the anti-fall device is achieved in that the friction coupling is connected in a rotationally fixed manner with the first shaft and the friction coupling is arranged and designed such that the friction coupling establishes a forcé- transmitting connection between the first shaft and the braking ring.

[0012] A particularly good transmission of forcé to the eccentric is achieved in that the at least one lever arm is connected with the eccentric via a third shaft which is arranged at a distance from the first and second shafts and is connected with the braking ring via a fourth shaft which is arranged at a distance from the first and second shafts.

[0013] A secure guidance of the anti-fall device on the safety device is achieved in that the housing is designed such that this encompasses the safety device from outside.

[0014] A particularly functionally reliable detection of the speed of the anti-fall device relative to the safety device is achieved in that the rolling device has at least one wheel, in particular two or more wheels, which roll on the safety device.

[0015] A simple connection of the anti-fall device to the safety device at any desired point on the safety device, and its detachment therefrom, is achieved in that the housing has two parts which can be moved relative to one another into a first position and a second position, wherein in the second position the housing has enlarged dimensions relative to the first position, so that in the first position the housing can be clipped onto a safety device and in the first position the housing can move along the safety device while being blocked to prevent it from becoming detached from the safety device.

[0016] A detection of a fall is achieved in a particularly simple manner in that the friction coupling is designed such that this establishes the force-transmitting connection at a predetermined rotational speed.

[0017] The invention is described in more detail in the following with reference to the drawing, in which :

Fig. 1 shows a side view of a preferred embodiment of an anti-fall device according to the invention

Fig. 2 shows a frontal view of the anti-fall device according to Fig. 1,

Fig. 3 shows a further side view of the anti-fall device according to Fig. 1,

Fig. 4 shows a top view of the anti-fall device according to Fig. 1,

Fig. 5 shows a frontal perspective view of the anti-fall device according to Fig. 1,

Fig. 6 shows a rear perspective view of the anti-fall device according to Fig. 1,

Fig. 7 shows an exploded view of the anti-fall device according to Fig. 1,

Fig. 8 shows a further exploded view of the anti-fall device according to Fig. 1 and

Fig. 9 shows an enlarged representation of a rolling device with centrifugal clutch for an anti-fall device according to the invention.

[0018] The preferred embodiment of an anti-fall device according to the invention shown in Figs. 1 to 9 has a two-part housing with a first housing part 10 and a second housing part 12 which can be moved relative to one another. Figs. 2 and 4 to 6 show the housing 10, 12 in a second position in which the housing 10, 12 can be clipped onto a safety device (not shown) in the form of a rail, for example with a T-profile. By pushing the two housing parts 10, 12 towards one another, the housing is closed, blocking the anti-fall device from becoming detached from the safety device in that the housing 10, 12 embraces the safety device from outside. In this pushed-together first position, the housing parts are connected together through releasable bolts 14.

[0019] The anti-fall device has a rolling device with two wheels 16 which roll on the safety device when the anti-fall device moves along the safety device. This takes place, for example, when a person who is to be secured who is attached to the anti-fall device is climbing a ladder with a safety device in the form of a climbing safety rail. The wheels 16 thereby detect the speed with which the anti-fall device moves along the safety device. The wheels 16 are connected in a rotationally fixed manner with a first shaft 18 which is mounted rotatably in the housing 10, 12. The first shaft 18 is surrounded by a braking ring 20 which is connected with cams 24 of an eccentric via lever arms 22. The cams 24 are formed eccentrically in relation to a second shaft 26 and are connected in a rotationally fixed manner with the second shaft 26. This second shaft 26 too is mounted rotatably in the housing 10, 12. The second shaft 26 is arranged at a distance from the first shaft 18.

[0020] The braking ring 20 is initially not connected with the first shaft 18 in a rotationally fixed manner; rather, the first shaft 18 is mounted rotatably within the braking ring 20. A friction coupling in the form of a centrifugal clutch is arranged on the first shaft 18 in the región of the braking ring 20 and is connected with the first shaft 18 in a rotationally fixed manner, as can be seen in Fig. 9. The centrifugal clutch has brake shoes 28 which, under the action of a centrifugal forcé, establish a friction-locking connection between the first shaft 18 and the braking ring 20 at a predetermined rotational speed.

The corresponding predetermined rotational speed is adjusted through the weight of the brake shoes 28 and retaining springs (not shown). By means of this predetermined rotational speed of the wheels 16 of the rolling device, it is detected whether the person secured with the anti-fall device is performing a normal climbing or descending movement or is falling. In the event of the secured person falling, the rotational speed of the wheels 16 exceed the predetermined rotational speed and the centrifugal clutch establishes a friction-locking, force-transmitting connection between the first shaft 18 and the braking ring 20. In this way, the braking ring 20 is rotated through the rolling wheels 16, actuating the lever arms 22 which rotate the cams 24 around the second shaft 26. This causes the cams 22 to press against a surface of the safety device facing the anti-fall device, so that a frictional forcé is created between the anti-fall device and the safety device such that a movement of the anti-fall device relative to the safety device is blocked after the anti-fall device has moved a short distance along the safety device after exceeding of the predetermined rotational speed. This stops the fall of the secured person and the fallen person is arrested by the anti-fall device, which is stopped and locked onto the safety device by the cams 24, without suffering serious injuries. As a result of the anti-fall device being loaded with the weight of the fallen person, the cams 24 then remain in contact with the safety device and hold the anti-fall device in position on the safety device until the load is relieved.

[0021] The friction coupling is shown here, purely by way of example, as a centrifugal clutch with friction-locking, force-transmitting connection. Alternatively, a friction coupling is also sufficient which transfers a forcé from the first shaft 18 to the braking ring 20 with a certain slip in relation to the braking ring 20. The cams 24 are advantageously designed and arranged such that when under load these automatically press against the surface of the safety device as soon as a contact exists between the cams and the surface. Only a small forcé is sufficient in order to rotate the cams 24 by means of the lever arm 22 until the cams 24 contact the surface. These then automatically tighten further until the movement of the anti-fall device relative to the safety device is blocked.

[0022] The lever arms 22 are each connected at one end vía a third shaft 30 with the cams 24 of the eccentric.

This third shaft 30 is arranged at a distance from the first shaft 18 and second shaft 26. The lever arms 22 are each connected at the other end vía a fourth shaft 32 with the braking ring 20. The fourth shaft 32 is also arranged at a distance from the first shaft 18 and second shaft 26.

[0023] Springs 34 rest against the housing 10, 12 and press the wheels 16 against the safety device. This ensures that the wheels 16 roll on the safety device without slipping and reliably detect the current speed of the anti-fall device relative to the safety device or the exceeding of a predetermined speed of the anti-fall device corresponding to the predetermined rotational speed of the wheels 16.

[0024] A lever 36 is connected with the second shaft 26 in a rotationally fixed manner and has a fastening lug 28 on an end facing away from the second shaft 26 for the attachment of a person who is to be secured. As a result, a swivelling of the lever 36, for example due to the tensión applied to the lever 36 as a result of a falling person connected with the anti-fall device via the fastening lug 38, also actuates the cams 24 in a blocking direction, independently of the friction coupling, so that a fall of the secured person is additionally detected via the lever 36.

[0025] The cams 24 are symmetrically designed and arranged on the second shaft 26 in such a way that a swivelling of the braking ring 20 in any direction leads to the cams 24 coming to press against the safety device. This blocking function depending on the rotational speed of the wheels 16 is thus independent of the direction in which the anti-fall device moves along the safety device.

Claims

1. Capture device, in particular fall protection lobes, which runs with a person to be secured, on a lockable or fixed liner serving as a safety device, in particular a guard rail, fall protection line or safety cable, with a housing (10,12), on which a first axis (18) is rotatably mounted, and with at least one roller device (16) pivotally connected to said first axis (18) arranged in such a way that it rolls on the securing device when the catch device moving along the securing device, wherein the roller device (16) is connected to a frictional force coupling (28) which, depending on a rotational number of the roller device (16), establishes a force-transmitting connection to an eccentric (24) by means of the friction, where the eccentric (24) is arranged and designed in such a way that, by force transferring connection to the roller device (16), it presses against the securing device in such a way that a friction-closing connection is established. between the housing (10, 12) and the securing device which blocks the movement of the housing (10, 12) with respect to the securing device, wherein the capturing device comprises a securing box (38) for impact of a person to be secured where the eccentric (24) is placed on a second axis (26) spaced from the first axis (18) and is pivotally connected to this second axis (26), characterized in that at least one rod arm (22) is connected on one side with the eccentric (24) and on the other side with a brake ring (20), the brake ring (20) being arranged and designed in such a way that the friction force coupling (28) establishes a transmitting force between the roller device (16) and the brake ring (20). ).

Capture device according to claim 1, characterized in that the second axis (26) is pivotally mounted in the housing (10, 12).

Capture device according to at least one of the preceding claims, characterized in that the frictional force coupling (28) is designed as a centrifugal force coupling.

Capture device according to at least one of the preceding claims, characterized in that an arm (36) is provided which is pivotally connected to the second axis (26) and which at a free end which faces washing from the other axis (26), has the fixing box (38) for the impact of a person to be secured.

Capture device according to at least one of the preceding claims, characterized in that the eccentric comprises one, two or more lugs (24) formed eccentrically with respect to the second axis (26).

Capture device according to at least one of the preceding claims, characterized in that the frictional force coupling (28) is pivotally connected to the first axis (18).

Capture device according to at least one of the preceding claims, characterized in that the friction force coupling (28) is arranged and designed in such a way that the friction force coupling (28) establishes a transmitting force between the first axis (18) and the brake ring (20). .

Capture device according to at least one of the preceding claims, characterized in that the at least one rod arm (22) is connected to the eccentric (24) via a third axis (30) spaced from the first and second axes (18). , 26).

Capture device according to at least one of the preceding claims, characterized in that the at least one rod arm (22) is connected to the brake ring (20) via a fourth axis (32) spaced apart from the first and second axes (18). , 26).

Capture device according to at least one of the preceding claims, characterized in that the housing (10, 12) is designed in such a way that it surrounds the security device from the outside.

Capture device according to at least one of the preceding claims, characterized in that the rolling device comprises at least one wheel (16), in particular two or more wheels (16) which roll on the securing device.

A catching device according to at least one of the preceding claims, characterized in that the housing comprises two parts (10, 12) which can be displaced relative to each other to a first position and a second position, wherein the housing (10, 12) in it second position has enlarged dimensions relative to the first position such that the housing (10, 12) in the first position can be attached to a securing device and the housing (10, 12) in the second position can be watered along the securing device, but is blocked from being detached from the fuse.

Capture device according to at least one of the preceding claims, characterized in that the frictional force coupling (28) is designed in such a way that it establishes the force-transmitting connection at a predetermined speed.