EP1957391B1 - Apparatus for, and method of, triggering an intercepting means - Google Patents

Abstract

The present invention relates to an apparatus for triggering an intercepting means on a lift car or a conveying arrangement of a lift installation, having a brakeable limiter cable (122) which is connected to the lift car or the conveying arrangement, it being possible for the intercepting means to be triggered by virtue of the limiter cable (122) being braked, characterized by a triggering mechanism (120) which is arranged between the limiter cable (122) and the lift car or the conveying arrangement, is connected to two ends (122a, 122b) of the limiter cable (122) and is mounted in a movable manner on the lift car or the conveying arrangement (110).

Description

The present invention relates to a device for triggering a safety gear on a car or a conveyor of an elevator system according to the preamble of patent claim 1. The invention further relates to a corresponding method according to the preamble of patent claim 8.

In a variety of moving bodies, such as conveyors in the field of automation or conveyor technology, or for example in elevators or the like, the determination or a control of the speed of the moving body, the elevator in particular the car, is of crucial importance to to ensure an efficient work process as well as the safety of persons or things.

In moving bodies in the form of elevator cars, a mechanical security system has proven to be in addition to the usual support cables another tensioned cable, hereinafter called Begrenzerseil attached to the moving parts, such as the car, and arranged in the shaft, in about stationary pulleys is performed.

From the GB 2 114 092 A For example, a safety mechanism for an elevator system is known. Here, an elevator system includes a speed limiter having a speed limiter wheel and a guide wheel with a governor rope extending therebetween connected to an actuating mechanism for a safety device of a car. The governor rope is biased by a spring. This speed limiter mechanism acts to pressurize the safety device in the event of an excessive speed of the car.

Such a security system is, for example, in the DE 299 12 544 U1 described. This document describes a device for limiting the speed of elevator systems with a Geschwindigkeitsbegrenzerrad, a governor rope, a safety gear on the car and a trigger mechanism for the safety gear. The trigger mechanism is designed here as centrifugal force limiter. With such a mechanism, at a predetermined overspeed of the car (for example 20% above allowable maximum speed), the speed governor wheel (idler) can be blocked in rotation by the attached centrifugal device, thereby also blocking the governor-driven governor rope from moving. Due to the standing governor rope and the car or car frame, which continues to move, a catch brake or a safety gear is triggered with increasing governor traction, which brakes or stops the car.

In the event of a voltage drop of the limiter rope, in particular in the case of a tension-free limiter rope (for example due to a rope tear), a safety system designed in this way is impaired. In this case, for example, the governor rope slip in the groove of the guide roller or the speed governor, whereby a triggering of the safety brake can not be guaranteed because of lack of governor traction.

Likewise, the safety brake, for example, in a rope-driven centrifugal force limiter or the like can not be triggered when the governor rope is no longer in ner intended position or cracked or no longer exists.

Such states of the limiter rope are usually detected electrically by so-called slack rope releases on one of the deflection rollers of the limiter rope, and an electrical emergency stop is subsequently initiated by means of the normal service brake. However, the safety gear is ineffective under such conditions, which can lead to further dangers, for example, in case of fire or inappropriate personal liberation, to a crash of the car. In the event of a fire in the hoistway, it may happen, for example, that first the limiter ropes burn through, without there being any actuation of the safety gear, and then blow the suspension cables. This can then lead to the crash of the cars.

On the one hand, the aim of the invention is to improve the safety of an elevator installation.

It is also desirable in systems that realize a speed monitoring of a car or a conveyor by means of a cable transmission to a safety gear to detect malfunctions of the system due to too low rope tension or missing rope in a simple and inexpensive way and then despite the lack of cable force the To trigger safety gear.

The present invention provides a device having the features of claim 1 and a method having the features of claim 9.

The solution according to the invention is characterized in that with the proposed device or the corresponding method for triggering a safety gear on a car or a conveyor of an elevator system both an excessive speed of the car or the conveyor as well as a drop or a loss of rope tension the Begrenzerseils can be determined in a simple manner, and in both cases a proposed safety gear can be triggered directly in a simple and reliable manner. In particular, with the device according to the invention, a situation can be avoided in which there is initially a drop or elimination of the Begrenzerseilspannung, and for this reason in connection thereto an operation of a safety gear is no longer possible.

Here, the two ends of the Begrenzerseils are attached to each other movably mounted components of the trigger mechanism. With this design, a normal operating position, in which there is sufficient cable tension of the governor rope, and a release operating position, in which the cable tension of the governor rope falls below a certain voltage value, can be realized in a simple manner. Here, the two components of the trigger mechanism in the normal operating position at a first distance, and in the release operating position, a second, different from the first distance to each other. By means of the thus occurring relative movement between the two components of the trigger mechanism and the concomitant change in length of the trigger mechanism can in a simple One triggered on the car or on the conveyor of the elevator system catching mechanism are triggered.

The device according to the invention is characterized in that it can trigger the safety gear both by means of the governor rope traction, and without the help of the governor rope traction. With this configuration, a safe deceleration of a car or a conveyor of a variety of possible situations in a simple manner can be accomplished.

According to the invention, in the case of an inadmissible elongation of the governor rope or an inadmissible fall of the cable tension of the governor rope or in the event of breakage of the governor rope, the release mechanism is brought from the normal operating position to the release position by moving one of the mutually movable components of the release mechanism from an operating position relative to the second the movable components are displaced by means of a permanently stored energy into a release position relative to the second of the movable components.

Advantageous embodiments of the invention are the subject of the dependent claims.

It proves to be particularly advantageous for storing the energy when the trigger mechanism has a preloaded spring. This spring can, depending on the design, be designed either as a tension or compression spring. Here, in the operating position, the force provided by the spring is compensated by the rope tension of the governor rope. If there is a drop in voltage or a break of the limiter rope, leads This results in a change in the length of the spring, whereby a catch mechanism operatively connected to the spring on the car or the conveyor of the elevator system can be triggered.

The energy stored by the spring over its entire stroke corresponds to a force which corresponds at least to the weight of the maximum single length of the governor rope from top to bottom plus the release force of the safety gear.

Conveniently, a mechanism for enabling a relative movement of the triggering mechanism with respect to the car is provided such that the triggering mechanism can be moved from the defined normal operating position to a further triggering position in the case of a speed of the car or of the conveyor which exceeds a presettable maximum speed. This mechanism expediently has a slot formed on the trigger mechanism into which a bolt attached to the elevator car or conveyor engages. If there is a slowing down or a stoppage of the governor rope due to an excessive speed of the elevator car due to an obstruction of the governor rope, the car, limited by the length of the oblong hole, can make a relative movement to the governor cable. Also by means of this relative movement provided on the car or the conveyor safety gear can be triggered in a simple and reliable manner.

Conveniently, the trigger mechanism is formed with a catch rod movably mounted on the car. Such a catch rod realizes the operative connection between the trigger mechanism and the safety device provided on the car or the conveyor, so that when the two components of the trigger mechanism relative to each other or the trigger mechanism in total relative to the car or the conveyor triggering the safety gear can be ensured.

According to a particularly preferred embodiment, the first component of the trigger mechanism is designed as a housing, and the second component is designed as a slide displaceable in the housing. Conveniently, the governor rope is further guided around two pulleys, wherein the one end of the governor rope is attached to the housing and the other end of the governor rope is attached to the plunger slidably mounted in the housing. The housing further expediently has on its outer side a tab which is formed with the slot in which the bolt mounted on the car is displaceable. On the plunger, the catch rod is also attachable, via which the triggering of the safety gear is accomplished. In this case, the plunger causes during normal operation by means of a spring action, in particular by means of a tension spring, maintaining the normal operating position of the trigger mechanism in such a way that the governor moves synchronously, ie at the same speed to the car or the conveyor. In this case, only in the event of an excessive speed and thus caused braking of the governor rope in existing Begrenzerseilspannung a relative movement of the car stationary fixed bolt in the slot. On the other hand, in the case of a drop, the Rope tension of the governor rope below a certain cable tension value to a caused by the spring loading relative movement of the plunger within the housing, whereby also a relative movement between the plunger and the catch rod is effected, which leads to the triggering of the safety gear.

Conveniently, the housing has two mutually displaceable and lockable components, in particular tubes, so that the overall length of the housing is adjustable. With this measure, in addition to or as an alternative to setting the cable tension of the governor rope by acting upon one of the deflecting rollers, a further adjustment possibility for the cable tension of the governor rope is provided.

Conveniently, the plunger is guided in a sleeve within the housing, wherein one end of the sleeve serves as a stop for the head portion of the plunger. This sleeve is expediently designed to be displaceable and lockable with respect to the housing, so that an adaptation of the spring tension and / or the cable tension of the governor rope can be achieved by corresponding displacement of the sleeve relative to the housing.

The displaceability of the housing components relative to one another or of the sleeve relative to the components of the housing is expediently realized by means of corresponding internal or external threads.

Figur 1

eine schematische (nicht maßstabsgetreue) seitliche Schnittansicht einer bevorzugten Ausführungsform der erfindungsgemäßen Vorrichtung, die mit einem Fahrkorb zusammenwirkt, beim Normalbetrieb einer Aufzuganlage,

Figuren 2a) - 2c)

in einer gegenüber der Figur 1 weiter vereinfachten seitlichen Schnittansicht verschiedene Betriebszustände der erfindungsgemäßen Vorrichtung,

Figur 3

eine perspektivische Ansicht einer bevorzugten Ausführungsform des erfindungsgemäß eingesetzten Auslösemechanismus,

Figur 4

eine seitliche Schnittansicht des Auslösemechanismus gemäß der Figur 3, und

Figur 5

eine perspektivische Ansicht eines Unterholms eines Fahrkorbs einer Aufzuganlage, an dem.der erfindungsgemäße Auslösemechanismus angebracht ist.

Preferred embodiments of the invention will now be explained in more detail with reference to the accompanying drawings. In this shows or show

FIG. 1

3 is a schematic (not to scale) side sectional view of a preferred embodiment of the device according to the invention, which cooperates with a car, during normal operation of an elevator system,

FIGS. 2a) - 2c)

in one opposite the FIG. 1 further simplified lateral sectional view of various operating states of the device according to the invention,

FIG. 3

a perspective view of a preferred embodiment of the invention used trigger mechanism,

FIG. 4

a side sectional view of the trigger mechanism according to the FIG. 3 , and

FIG. 5

a perspective view of a sub-spar of a car of an elevator installation, is mounted.to the trigger mechanism according to the invention.

In FIG. 1 is an elevator installation, which comprises a preferred embodiment of the device according to the invention, designated overall by 100. A car is shown schematically and designated 110, on which a safety gear 146 is arranged.

The device according to the invention has a trigger mechanism 120 and a limiter cable 122. The limiter rope 122 is guided around two deflection rollers, namely around a deflection roller provided in the lower shaft area 150, and a guide shaft 152 mounted in the upper shaft area.

A first (upper) end 122a of the limiter cable 122 is connected to an upper terminal 120a of the triggering mechanism, and a second (lower) end 122b of the limiter cable 122 is connected to a lower terminal 120b of the triggering mechanism 120. The connections 120a and 120b are expediently designed as cable locks. The upper terminal 120 a is formed at the upper end of a housing 124 of the triggering mechanism 120. The lower limiter cable end 122b is attached at the bottom to a slidable plunger 126 provided in the housing 124.

The cable tension of the governor rope 122 is adjustable in a manner known per se by means of positioning the deflecting rollers 150, 152, for example by means of a tension weight 154. An additional or alternative possibility of adjusting the cable tension will be described below with reference to FIG FIG. 4 explained. The cable tension causes a downwardly directed force illustrated by an arrow G, which acts on the plunger 126.

The plunger 126 is further acted upon by a compression spring 130 opposite to the direction of the cable tension (illustrated by arrow F), and lies in the in FIG. 1 illustrated normal operating state with its head portion 126a on an upper ram storage (or stop) 128 on. In the upper ram bearing 128, a recess is formed, through which the spring 130 engages the head end 126a of the plunger 126. Accordingly, in the in FIG. 1 illustrated normal operating state the by the rope tension applied limiter rope tensile force greater than a force caused by the spring 130.

The cable tension of the governor rope 122, and thus the preload between the upper and lower governor cable connections 122a, 122b, must be so great that in the normal event of a fall, i. at too high speed of the car with a functioning or intact limiter rope 122 and subsequent braking of the governor rope by a speed limiter, the safety gear 146 is triggered both when catching down and when catching up with the help of Begrenzerseil-pulling force.

Furthermore, the cable tension must be such that the plunger 126 is pulled firmly onto the top of the upper plunger bearing 128, and the plunger or its head portion 126a is not raised by the spring 130 and / or car accelerations during normal driving operation. ie in the representation of FIG. 1 force exerted by the compression spring on the plunger upwards (arrow F) must be more than compensated by the cable tension (arrow G).

The plunger 126 is longitudinally displaceable, i. in the direction of travel of the trigger mechanism 120 and the car, in the housing 124 slidably mounted.

On the outside of the housing 124 is a tab 131 having a slot 132 provided therein, whose extension direction is parallel to the direction of travel of the car 110, formed. In this slot 132 engages a fastened to the car 110 bolt 111 a. Along the length of the slot 132 are thus as below is explained further, car 110 and housing 124 to each other slidably connected.

From the head end 126a of the plunger 126, a catch rod 140 extends through an in FIG. 1 not shown, but in FIG. 3 recognizable opening 144 in the housing 124 in the direction of the elevator car 110. The catch rod 140 is biased at its car-side end by means of a tension spring 112 provided on the car. The catch rod 140 is the housing side and car side mounted, in particular pivotally mounted, and also car side with in FIG. 1 schematically illustrated safety gear 146, which is triggered during a pivoting movement of the catch rod (as will be explained in detail below). The connection between catch rod 140 and the catch 146 is in the FIGS. 1 and 2 indicated schematically at 142.

The upper deflection roller 152 is expediently designed as a speed limiting wheel. As a result, blocks the upper guide pulley 152 and decelerates the governor rope when exceeding a maximum permissible speed of the Begrenzerseiles 122 and thus moving in the same operating state at the same speed car 110 and thereby causing a relative movement between governor 122 and thus triggering device 120 and car 110.

The lower guide roller 150 is expediently designed as a chip roll, which is mounted displaceably or pivotably and connected to a tensioning weight 154, so that the governor rope 122 always maintains a certain minimum stress. This minimum voltage ensures a safe running of the governor rope 122 in the respective (not shown) wheel grooves of the guide rollers 150, 152 and thus a reliable triggering of the safety gear in the case of blocking the trained as Geschwindigkeitsbegrenzerrad deflection roller 152th

The different operating states or tripping states of the device according to the invention will now be described with reference to FIG FIGS. 2a) to 2c ) explained further.

In FIG. 2a ) is, in a further simplified representation, again the normal operating state of the device according to the invention shown. As already with reference to FIG. 1 illustrated, the cable tension of the governor rope 122 is sufficiently large, so that the head end 126a of the plunger 126 is pulled against the upper plunger bearing 128.

The travel speed of the elevator car 110 and the governor cable 122 operatively connected to the car 110 is within the allowable range, i. there is no blockage or deceleration of the deflection roller 152.

In this state, as mentioned, the plunger 126 is pulled against the upper plunger bearing 128, and the fixed to the car 110 bolt 111 is located at the upper end of the slot 132nd

The catch rod 140 is in the neutral position, ie there is no triggering of the connected via the connection 142 with the catch rod 140 safety gear 146th

In FIG. 2b ) shows the state in which the governor rope 122 is de-energized. This condition may occur, for example, due to a rope break. A rope break is in FIG. 2b ) indicated schematically at the point of the arrow S. Analogous considerations also arise in the event that the cable tension of the governor rope 122 falls below a certain minimum value.

In the case of tensionlessness of the limiter cable 122, the compression spring 130 causes the plunger 126 to move upwardly within the housing 124 and thus also to remove the head region 126a of the plunger from the upper pushrod support 128. This is due to the fact that only the upwardly directed force caused by the spring 130 acts on the plunger (arrow F in FIG FIG. 1 ). This means that the catch rod 140 connected to the plunger 126 or the head region 126a of the plunger is pushed upwards so that an actuation of the catching device 146 occurs via the connection 142. In this case, the housing which takes over the support of the spring supports downward with the upper edge of the elongated hole 132 on the bolt 111.

In this way, in contrast to conventional devices, even with voltage-free limiter 122 ensures a safe operation of the safety gear 146.

A third operating state, which corresponds to the traditional operating state of a speed limiter device, is in Figure 2c ). Here it is assumed that the car 110 has exceeded a certain maximum speed.

Due to the operative connection of the elevator car 110 with the governor rope 122, a corresponding rotational speed of the upper deflecting roller 152, which, as already mentioned, is formed in a manner known per se with a blocking device (illustrated schematically and designated by 153). Such a blocking device 153 may be formed, for example, as a centrifugal force. As a result of the blocking of the deflection roller 152, the limiter cable 122 is decelerated or stopped while the car 110 continues, which leads to a relative movement between the limiter cable 122 and thus the triggering device 120 and the car 110. It should be noted that the cable tension and the force exerted by the spring 130 on the plunger 126 relative to the in FIG. 2a shown normal operating state remain essentially unchanged.

These. Relative movement between the triggering device 120 and the car 110 is transmitted via the catch rod 140 via the connection 142 to the safety gear 146 and triggers the safety gear.

A preferred embodiment of the triggering mechanism 120 will now be described with reference to FIGS Figures 3 and 4 explained in detail.

FIG. 3 1 shows the housing 124, the cable connections 120a, 120b, the lower end of the plunger 126, the tab 131 and the elongated hole 132 introduced into the tab. Furthermore, one recognizes that from the Housing 124 projecting catch rod 140 and the opening 144th

As further in FIG. 3 To recognize, the housing 124 has an upper or outer housing part 124a, and a lower or inner housing part 124b. The housing parts 124a and 124b may be formed, for example, as tubes.

The components mentioned are also in FIG. 4 in which a sectional view of the release mechanism according to FIG. 3 is shown to recognize.

The tubes 124a, 124b are in the overlapping region 125, for example by means of formation of corresponding thread devices, against each other displaced and locked together. The total length of the housing 124 is thus variable or adjustable by appropriate displacement of the tubes 124a, 124b.

The plunger 126 is longitudinally displaceably mounted in a sleeve 127 which is arranged in the longitudinal direction adjustable and fixable or lockable in the tubes 124a, 124b. The sleeve 127 forms with its upper end 127a the upper ram bearing 128, i. a stop for the head end 126a of the plunger to limit the movement of the plunger 126 in the downward direction. Due to the adjustability and fixability of the sleeve 127 in the longitudinal direction thus an adjustable stop for the plunger movement is provided down.

In the embodiment of the FIG. 3 For example, the restricting cable end 122a coming from above is fixed to one end of the upper pipe 124a. The already mentioned opening 144 of the Housing is suitably formed in the upper tube 124a. Through this opening, as mentioned, the catch rod 126 pivotally mounted on the plunger 126 can protrude outward. Advantageously, the housing or the upper tube 124a has at least two laterally offset openings 144, wherein at least one of these openings for easier mounting of the catch rod 140 on the plunger 126 is used. As in FIG. 4 can be seen, a pivotable mounting of the catch rod 140 on the plunger 126 is conveniently accomplished by means of a hinge 140a. In FIG. 4 Furthermore, the normal operating positions of the catch rod 140 in solid lines and the release position are shown in dashed lines.

Between the sleeve 127 and the lower tube 124b, a spring plate 134 is arranged, which is displaceable and fixable on the sleeve 127 in the longitudinal direction. The spring plate 134 is expediently displaceable and fixable in the upper or lower tube in the longitudinal direction. The spring plate serves as a lower stop for the spring 130th

For a relative displacement of sleeve 127 and spring plate 134 to each other for adjusting the spring force, the sleeve 127 expediently has an external thread, and the spring plate 134 has a corresponding internal thread.

The spring plate 134 is expediently fastened with its outer circumference to the lower tube 124b. By forming appropriate threads of the spring plate 134 may be formed slidably relative to the lower tube. By forming appropriate thread between the Upper tube and the lower tube can be accomplished by a displacement of the upper tube and the lower tube to each other, also a displacement of the spring plate relative to the upper tube. Likewise, all adjustments could be made by an additional component, for example with a lever, hydraulically, pneumatically or with an electric drive.

A locking example of the upper tube 124a with respect to the lower tube 124b can be achieved after setting a desired positioning, for example by screwing through a slot 129 in a tube and a thread in the other tube. The sleeve 127 and the lower tube 124b can be locked after setting a desired relative position, for example by screwing or a screw 135.

Advantageously, the sleeve 127 at its lower end on the outer periphery of a polygon or other attack possibility, in FIG. 4 schematically indicated at 127b, to facilitate the attack to twist the sleeve 127 or to hold the sleeve when other parts, such as the lower tube 124b are to be rotated on.

The spring 130 is disposed between the spring plate 134 and the head end 126a of the plunger 126, wherein, as mentioned, the upper sleeve end 127a in the illustrated embodiment, the upper plunger bearing 128 for the head end 126a of the plunger during tensioning of the spring by the tensioning of the governor rope 122nd forms. By tightening the governor rope by increasing the distance between the two Pulleys or by appropriate shifts in the triggering device, the spring 130 is tensioned and after resting the plunger 126 on the upper ram bearing 128, the voltage in the governor 122 can be increased as needed.

With the illustrated embodiment, due to the displaceability of the sleeve 127, the upper plunger bearing or the lower stop for the plunger 126 can be adjusted in height, so that in different elevator systems different lever configurations of the catch rod 140, or lever movements, aspect ratios or forces can be set or taken into account.

It has already been mentioned that the cable tension of the governor rope 122 can be adjusted by pivoting the lower deflecting roller 150. Additionally or alternatively, the cable tension and / or the bias of the spring 130 by moving the tubes 124a, 124b and the sleeve 127 relat.iv each other can be changed.

After adjusting a rope tension of the governor rope 122, for example, by appropriate positioning of the sleeve 127 can be adjusted by a displacement of the lower tube 124b relative to the upper tube 124a, the spring tension of the spring 130 such that at normal catch, ie in the case of excessive speed of the car That is, the head 126a of the plunger 126 on the upper end 127a of the sleeve is left with sufficient force and does not lift off while the trigger mechanism 120 is displaced with respect to the car 110 as a whole.

Additionally or alternatively, after adjustment of the rope tension of the governor rope 122 by means of the corresponding positioning of the sleeve 127 by displacement of the lower tube against the upper tube, the tension of the spring can be adjusted so that upon loss of tension or breakage or tearing of the governor rope 122 the head end 126a of the plunger of the upper sleeve end 127a is lifted by means of the stored spring force (bias) of the spring 130, and with the moving plunger, the catch rod 140 is actuated. Here, the trigger mechanism 120 is supported at the connection point to the car or the catch frame or the conveyor, that is, the bolt 111 in the slot 132, from.

Advantageously, the catch rod 140 is pivotally or rotatably mounted on the plunger 126 by means of the joint 140a, and on the car, and also has a third articulated connection for triggering the catching device. In the Figures 2a) - 2c ), such a second joint on the car is designated 140b. The third hinged connection is a special embodiment of the connection 142.

In FIG. 5 Finally, the area of a lower beam of a car is shown, on which the trigger mechanism 120, as shown for example in the Figures 3 and 4 is shown attached. In addition to the triggering mechanism 120, cabin insulation devices 512 provided on the lower beam 510 can be seen. Roller guides 514 are provided below the sub-beam. A safety gear is in FIG. 5 represented and designated 516.

Claims (10)

1. Apparatus for actuating a catching device on a lift cage or a conveying means of a lift installation, having a limiter cable (122) connected to the lift cage or the conveying means and adapted to be braked, the catching device being adapted to be actuated by the braking of the limiter cable (122), comprising an actuating mechanism (120) arranged between the limiter cable (122) and the lift cage or the conveying means, which is connected to both ends (122a, 122b) of the limiter cable (122)) and is movably mounted on the lift cage or the conveying device (110), the two ends (122a, 122b) of the limiter cable (122) being attached to components (124, 126) of the actuating mechanism (120) that are mounted to be movable witz respect to one another, characterised in that it is capable of actuating the catching device both with the aid of the tensile force of the limiter cable and also without the aid of the tensile force of the limiter cable, while in the event of an elongation of the limiter cable (122) beyond a predeterminable maximum value or a drop in the tension of the cable below a predeterminable minimum value or in the event of breakage of the limiter cable, the actuating mechanism can be moved out of a defined operating position into an actuating position by one of the components (126) of the actuating mechanism that are movable with respect to one another being movable out of a defined operating position relative to the other one (124) of the movable components into an actuating position relative to the other one (124) of the movable components by means of a permanently stored energy (130).

Apparatus according to claim 1, characterised in that the actuating mechanism comprises a tensioned spring (130).

Apparatus according to one of the preceding claims, characterised by a mechanism (131, 132, 111) for enabling a relative movement of the actuating mechanism (120) relative to the lift cage (110), so that in the event of a defined excessive speed of the lift cage (110) or the conveying means, the actuating mechanism can be brought from the normal operating position into a further actuating position by braking of the limiter cable.

Apparatus according to one of the preceding claims, characterised in that the actuating mechanism (120) is constructed with a catching linkage (140) movably mounted on the lift cage.

Apparatus according to one of the preceding claims, characterised in that the second component (124) of the actuating mechanism (120) is provided as a housing, and the first component (126) is provided as a ram that is movable within the housing (124).

Apparatus according to claim 5, characterised in that the housing (124) has two housing parts (124a, 124b) that can be moved relative to one another, so that the overall length of the housing (124) is adjustable.

Apparatus according to one of the preceding claims, characterised in that the ram (126) is guided in a sleeve (127), one end of the sleeve acting as a stop for a head region (126a) of the ram (126).

Method of actuating a catching device on a lift cage or a conveying means of a lift installation with the apparatus according to claim 1, characterised in that between the limiter cable (122) and the lift cage or the conveying means an actuating mechanism (120) is arranged which is connected to two ends (122a, 122b) of the limiter cable (122) and is movably mounted on the lift cage or the conveying means (110), wherein, in the event of breakage of the cable or a drop in the tension of the limiter cable below a predeterminable minimum value, the actuating mechanism is moved out of a normal operating position into an actuating operating position, as a result of which a catching linkage (140) of the actuating mechanism is moved from am operating position into an actuating position, and whereby a catching device connected to the catching linkage (140) is then actuated.

Method according to claim 8, characterised in that the movement of the actuating mechanism from the normal operating position into the actuating operating position is implemented by a relative movement of two components (124, 126) of the actuating mechanism to one another.

Method according to one of claims 8 or 9, characterised in that, where the limiter cable (122) is correctly tensioned, in the event of the lift cage (110) exceeding a preselectable maximum speed, the limiter cable is blocked and as a result relative movement between the lift cage (110) and the actuating mechanism (120) is implemented, thereby actuating the catching device.

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