EP1234089A2

EP1234089A2 - Catch device for a climbing protection system

Info

Publication number: EP1234089A2
Application number: EP00985113A
Authority: EP
Inventors: Klaus Meister
Original assignee: Christian Dalloz Holding Deutschland GmbH and Co KG
Current assignee: Honeywell Fall Protection Deutschland GmbH and Co KG
Priority date: 1999-11-29
Filing date: 2000-11-29
Publication date: 2002-08-28
Anticipated expiration: 2020-11-29
Also published as: ATE455230T1; CZ301395B6; WO2001040611A2; DK1234089T3; DE50015845D1; EP1234089B1; WO2001040611A3; US6725969B1; CZ20021860A3; HUP0203417A2; PL355577A1; ES2338296T3; DE29920850U1; PL202998B1; HU227390B1

Abstract

The invention relates to a catch device (10) for a climbing protection system. Said device can be guided in a guide rail (39) and is provided with a housing (12) and a detent pawl (16) rotationally mounted therein that can be rotated about an axis (18) and comprises a catch point (34) to secure connecting means, whereby the detent pawl (16) can be rotated between an unlocked and a locked position of the catch device (10). Said detent pawl (16) is held by a spring (36) in the locked position. In the unlocked position, the connecting line between the rotational axis (18) and the catch point (34) forms a pointed angle with the horizontal. In the unlocked position of the detent pawl (16) the connecting line between the rotational axis (18) and the catch point (34) forms an angle of more than 2°, e.g. 5°, with the horizontal.

Description

Fall arrest system

description

The invention relates to a fall arrester for a fall arrest system for preventing a person from falling from a ladder, a platform or the like. The safety gear runs in a guide rail. The person to be secured wears a safety harness and is connected to the safety device by a connecting means. The catching device has a runner or slide which runs in the guide rail. The rotor has a housing and a pawl rotatably mounted in it, which is loaded by a spring. The spring pushes the pawl into a locked position. In the event of a crash, the pawl then bumps against catches or a perforation in the guide rail. The connecting means is attached to a stop point of the pawl. To dismount, the pawl is pivoted into an unlocked position against the force of the spring.

Such a fall arrester, which is suitable for a fall arrest system, is known from EP-A-0 168 021, DE-A-27 36 037 and DE-A-19 61 757. A guide rail with a C-profile is used in these fall arrest systems. The edges of the longitudinal opening of the C-profile are the guide flanges on which the safety gear is guided. In the rear wall of the C-profile, catches are pressed out or recesses are perforated, against which the pawl runs in the event of a crash, so that the locking takes place in a form-fitting manner.

The pawl points downwards so that the pawl runs over the catches or the perforations in the rear wall of the C-profile when climbing up. When descending along the ladder, the user leans back (back pull) so that the

The pawl is pulled away from the rear wall of the guide rail and the slide can travel downwards unhindered. With these safety devices, the connecting line between the pivot point of the pawl and the attachment point encloses an acute angle of approximately 30 ° with the horizontal and the pawl is pivoted by approximately 25 to 30 ° from the fully unlocked to the fully locked position. For reasons of operational safety, the pawl is pressed into the locked position by a relatively strong spring. The pivot point of the pawl is approximately in the middle between the two axes of the rollers to distribute the load and abrasion to the rollers.

In some cases it is not possible to dismount with a back pull. In order to climb through narrow manhole covers, manholes, back basket ladders, etc., the person ascending or descending must keep close to the ladder. Due to the lack of back pull, the pawl is pressed by the spring into the guide rail profile, so that the catching device is stopped by the catch or the perforations in the rear wall of the guide rail and it is not possible to get off. For use of the safety gear in such cases, special runners are used, which are designed so that the weight of the body of the rotor is greater than the force of the spring loading the pawl, so that the pawl is unlocked when the safety gear is held at the anchor point ,

A catching direction is known in which the stop point in the unlocked position lies above the horizontal going through the pivot point of the pawl. The safety gear can only be used for dismounting without a back pull, because the back pull would pull the pawl into the locked position.

The object of the invention is a safety device with which one can climb into narrow shafts without problems (dismounting without back pull), but which can also be used in the usual way on ladders (dismounting with back pull). According to the invention, this object is achieved in that the catching device is unlocked when the connecting line between the pivot point of the pawl and the attachment point forms an angle with the horizontal of less than 2 ° and that the spring exerts a torque on the pawl that is smaller than that the weight of the safety gear generated torque when the safety gear is held at the point of deflection.

Are the two above Conditions combined in a safety gear, so you can use it universally in all conditions and at the same time allows the user the greatest comfort.

When dismounting with back pull, an angle of about 2 ° to the horizontal is established in the connecting means, the person applying a force of up to about 600 N into the connecting means. This angle can be slightly smaller (0 °) or larger (4 °) due to different friction between the rotor and the guide rail or the condition of the guide rail. If you now want to descend unhindered, the pawl must remain pulled through the back pull in this area from 0 ° to 4 °.

The stop point of the pawl is below the horizontal going through the pivot point of the pawl. The connecting line between the stop point and the pivot point of the pawl preferably forms an angle of approximately 5 ° with the horizontal when the pawl is in the unlocked position. This ensures that the pawl is safely in the unlocked position when dismounting with the back pull.

The pawl preferably reaches the locked position by pivoting only about 15 °. The pawl protrudes so far from the underside of the runner that it against the catch or the holes in the rear wall of the Guide rail bumps. In order to achieve a sufficient displacement of the tip of the pawl between the unlocked and the locked position despite this relatively small pivoting angle, the distance of the tip from the pivot point is as large as possible. The pivot point is preferably at the top of the rotor and the tip of the pawl at the bottom.

Due to the small angle that the attachment point lies below the horizontal in the unlocked position and the small swivel angle1 between the unlocked and locked position, the horizontal path that the attachment point covers between the two positions is very small. Despite the relatively low force of the spring, full operational safety is guaranteed.

Overall, the rotor is an approximately rectangular housing with a central opening. The pawl is pivoted in the central opening around a horizontal axis of rotation.

The safety gear is guided by guide devices in the guide rail. The guide devices rest on the outside and inside of the guide flanges of the guide rail. The guide devices are provided at the upper and lower ends of the rotor and, as is known from DE 299 06 047, can each have two pairs of standing rollers. Preferably, two additional standing rollers are provided in the catching device according to the invention, which are in use within the guide rail, the pivot point of the pawl being approximately between these additional rollers and the guiding device at the upper end of the catching device.

An embodiment of the invention is explained below with reference to the drawing. Show it: Figure 1 shows the catching device in an isometric view from the top right front;

Figure 2 shows the catching device in an isometric view from the top right rear;

Figure 3 shows the catching device in vertical section, the forces occurring when dismounting with back pull are illustrated and

Figure 4 shows the catching device in vertical section, the forces occurring when dismounting without back pull are shown.

The fall arrester 10 forms the movable part of a fall arrest system and runs in a guide rail. The secured person wears a safety harness and strikes the catching device 10 with a connecting means and a snap hook. The secured person is thereby held in the event of a crash.

The catching device 10 has a housing 12 with a central opening 14, in which a pawl 16 is mounted so as to be pivotable about a horizontal axis 18. At the upper and lower ends of the catching device 10, guide devices 20, 22 are provided for guiding the catching device 10 in the guide rail.

The guide rail has the C profile known from DE 299 06 047 with guide flanges along the opening in the front of the C profile and with a rear wall. The catching device 10 is guided in this opening. The guide devices each consist of four standing rollers 24, which are arranged in pairs, so that one roller 24 rolls on the inside of the guide flanges and one on the outside of each pair. The axes of rotation of the rollers 24 are parallel to the horizontal axis of rotation 18 of the pawl 16. to Φ rt • Ü N n_ α

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secured person descends the ladder without back pull, as e.g. in narrow shafts or back basket ladders. The secured person cannot lean back from the ladder, so that the catching device 10 hangs down under its own weight. The arrow 40 is the tensile force acting on the deflection point 34. It therefore points vertically upwards. Since the connecting line between the axis of rotation 18 and the opening 34 is approximately horizontal, the maximum torque acts on the pawl 16. The spring 36 presses approximately in the middle between the axis 18 and the opening 34 against the pawl 16. The force of the spring 36, which is represented by the arrow 44, is chosen so that the torque it exerts on the pawl 16 is smaller than the torque generated by the tensile force 40. The size of the pulling force 40 is determined by the weight of the catching device 10. It is opposite to the weight shown by arrow 46.

Since the pawl 16 from the unlocked position, in which the connecting line between the axis of rotation 18 and the attachment point 34 is only 2 to 5 ° below the horizontal, only needs to be pivoted by 14.7 ° in order to get into the locked position horizontal path very small, which the anchor point covers. Despite the relatively low force of the spring 36, full operational reliability is therefore guaranteed.

List of reference numbers

Safety gear 39 guide rail

Housing 40 traction

Opening, 42 friction

Pawl 44 spring force

Turning axis 46 weight

upper, lower guide device

roll

Sliding elements

Base

additional roles

web

top

Opening, attachment point

feather

pen

catching stops

Claims

H O

additional guiding devices (28) in the middle of the catching device (10), the axis of rotation of the pawl (16) being arranged approximately in the middle between the additional guiding device (28) and the guiding device (20) at the upper end of the catching device.