The invention relates to an elevator installation with an elevator car brake device
and a method for braking an elevator car.
EP0648703 is a hydraulically operated braking device for
Braking an elevator car known, on the one hand in the case of
serves as a safety brake or safety gear and on the other hand
also usable as a holding brake. The braking device comprises
at least one with a guide rail
the elevator car cooperating brake unit, in which by
Actuation of a brake piston with a hydraulic fluid
Friction between a brake plate of the brake unit and the guide rail
and thus a braking force braking the elevator car is generated.
The pressure in the hydraulic fluid acting on the brake piston
is generated by a motor driven pump that is part of one
the elevator car installed hydraulic unit is.
the braking device as disclosed in EP0648703 is known for
Generation of pressure in the hydraulic fluid, a hydraulic power unit
with electric motor, engine control, hydraulic pump, pressure relief valve
and pressure monitoring
required, which is installed on the elevator car. Such
Hydraulic unit causes considerable procurement installation and maintenance costs.
In addition, the hydraulic unit generates noises and vibrations that
be felt by the elevator passengers as unpleasant. In order to
Such a hydraulic unit even in case of power failure its function
as safety brake at overspeed
the elevator car can fulfill,
an emergency power supply is required, resulting in additional costs for material,
Installation and maintenance is connected. In addition, the braking device is due
the considerable number of components such as the engine control,
the motor current fuse, the control valves (directional control valves), the pressure regulating valves
and the accumulator is not failsafe.
Invention is based on the object, an elevator system with a
Elevator car and an elevator car braking device and a
To propose a method for braking an elevator car, the
mentioned disadvantages of the cited as prior art device
does not have. In particular, therefore, an elevator car braking device should
be created, which can be easily and inexpensively manufactured and installed
is, no noise
and generates no vibrations, just virtually fail-safe components
includes and therefore an extremely
low probability of failure guaranteed and low maintenance
Task is with the elevator system described below
an elevator car brake device and by a method according to the invention
released for braking an elevator car.
Elevator installation comprises the elevator cage braking device at least
an acting between an elevator car and a stationary brake body,
hydraulically activated brake unit and a speed limiter,
wherein at the elevator car, a hydraulic pressure generating device
attached and the speed limiter with a speed limiter rope
cooperates with the hydraulic pressure generating device coupled
The method according to the invention is a method for braking an elevator cage of an elevator installation in the case of an impermissible operating state, which comprises the following method steps:
- In the case of an inadmissible operating state while the elevator car is in motion, a speed limiter and a speed limiter cable interacting with it are blocked,
- - By the blocked speed limiter rope attached to the moving elevator cabin hydraulic pressure generating device is actuated, and
- - By a generated in the hydraulic pressure generating device hydraulic pressure at least one hydraulically operated brake unit is activated.
The invention is therefore based on the idea of braking units
Elevator cab braking device in the presence of an impermissible operating state
and as a result blocked speed limiter cable thereby
to enable the blocked speed limiter rope a
hydraulic pressure generating device on the moving elevator car
at least one connecting line at least one, preferably
However, several hydraulically activated brake units of the elevator car
The elevator cage braking device or method according to the invention achieves substantially the following advantages:
At least one, but advantageously a plurality of brake units of an elevator car can be activated by the hydraulic pressure generating device, for example via connection lines which are easy to install, without requiring a hydraulic unit installed on the elevator car. Noise and vibration in the elevator Be avoided by the elimination of a hydraulic power unit, and the reliability of the entire elevator car braking device is greatly improved by the use of few and virtually fail-safe components. The elevator car braking device according to the invention also requires no emergency power supply and brings significant cost savings in that the components to be purchased are cheaper, that the installation of the components is simpler, and that virtually no maintenance is required.
Advantageous embodiments and further developments of the subject invention and the inventive method will become apparent from the dependent claims and are described below:
According to a preferred embodiment of the invention, the hydraulic pressure generating device has an operatively connected to the speed governor rope pumping device, which is actuated with the elevator car blocked by the speed governor rope blocked, the pumping device, when actuated, conveys a hydraulic fluid into a hydraulic line system comprising at least one hydraulic actuator a brake unit is connected.
and reliable embodiment of the invention is that
the hydraulic pressure generating device as a pumping device
serving hydraulic cylinder with at least one pump piston.
a particularly preferred embodiment for its simplicity
The invention is the pump piston on a piston rod of the hydraulic cylinder
fixed and the piston rod with the speed governor rope
Terms of functionality
and space is optimal an embodiment of the invention, in
the piston rod emerges from both sides of the hydraulic cylinder
and is arranged in alignment with the speed governor cable,
with which she is coupled. In this arrangement, the
from speed governor rope to the pump piston without linkage with
minimal space requirement and virtually no energy loss.
is the hydraulic pressure generating device via at least one hydraulic
Connecting line with at least one hydraulic actuator at least
a hydraulically operated
Brake unit connected. This is achieved with the lowest
Effort and with minimal installation space several brake units on the elevator car
can be activated without complicated connecting rods required
the hydraulic cylinder an elastic return element, preferably
in the form of a compression spring, the pump piston during normal operation of the elevator
with a certain preload yielding against a final position in the
Hydraulic cylinder biases. This facility ensures that
that when accelerating or decelerating the elevator car the
Inertia force acting on the pump piston from the governor rope
the hydraulic pressure generating device can not operate.
applicable is an embodiment
the invention, wherein the hydraulic cylinder is an elastic
Contains centering device,
in normal operation of the elevator the pump piston with a certain
Preload force, but yielding in a middle position in the hydraulic cylinder
fixed, and that the pump piston through the speed governor rope
from the above middle position into two opposite ones
Directions is displaceable. The resiliently biased fixation of the
Pump piston in the center position ensures that when accelerating
or when Verzö like
the elevator car from the speed governor rope on the
Pump piston acting inertial force
the hydraulic pressure generating device can not operate.
When blocking the speed governor rope during a
Drive the elevator car allows
However, they the deflection of the pump piston by the speed governor rope
and in the down direction.
Preferably, in one embodiment of the invention in which braking devices in the form of safety gears are used, a deflection of the pump piston ( 510.1.5 ) upwards the activation of a first group of hydraulic actuators and a deflection of the pump piston down the activation of a second group of hydraulic actuators.
in one embodiment
the invention, wherein the brake unit is a hydraulic actuator
and at least one friction element, causes a deflection
the pump piston up the admission of at least one
Actuator at least one brake unit with a first fluid pressure
and a deflection of the pump piston down the admission of the same
at least one actuator of the same at least one brake unit
with a second fluid pressure.
According to one of the preferred embodiments of the elevator installation according to the invention, the brake unit is present in the form of a safety device attached to the elevator car, which comprises at least one clamping element which, in the event of an inadmissible operating state, is replaced by the hydraulic Actuator in frictional contact with a stationary brake body and in the sequence in a clamping position can be brought, which has a braking effect between the brake unit (safety gear) and existing in the form of a guide rail stationary brake body result. Through the system with hydraulically activated actuators can be virtually all known from guide types of elevator safety devices with low space requirements and with little effort operationally reliable.
According to one
further preferred embodiments
Elevator installation, the brake unit comprises a hydraulic actuator
and at least one friction member arranged so that at
moving elevator cabin and blocked speed limiter cable
the at least one friction element by the hydraulic actuator
against a stationary
Brake body pressed
is. An elevator car brake device according to this principle has
the advantage that they are made of very simple, compact braking units
which cause less jerk when activated,
as brake units, which can be brought on the principle of in clamping position
Advantages in terms of optimal braking behavior are at a
Elevator cab braking device comprising a brake unit with a hydraulic
Actuator and a pressed against a stationary brake body friction element
comprises, achieved by at least one pressure control valve
is present, with which the fluid pressure
is regulated by the hydraulic pressure generating device on the
Connecting line transferable to the hydraulic actuator
is. This is an easy to carry out adaptation occurring
Braking force to given or changed
System properties guaranteed.
Lowest possible load
the passengers during a braking of the elevator car in case of an impermissible operating state
is achieved with an elevator car brake device having a
comprising control means cooperating with the pressure regulating valve,
which is designed so that the acting on the actuator hydraulic
Pressure in dependence
from a detected payload in the elevator car or by a
the elevator car is adjustable.
The invention are described below with reference to the accompanying drawings
1 a schematic representation of an inventive elevator system with an guided on guide rails elevator car, an elevator car braking device comprising a cooperating with the guide rails brake unit on the elevator car, a speed limiter speed limiting cable and a hydraulic pressure generating device which acts on actuators of the brake unit.
2 an enlarged view of the brake unit according to
1 with two acting on clamping elements of the brake unit hydraulic actuators and a representation of an actuated by the speed governor hydraulic pressure generating device.
3 a brake unit according to 1 , with two hydraulic actuators, as well as a schematic representation of an actuated by the speed governor rope hydraulic pressure generating device with two each associated with an actuator pressure chambers.
4 two each acting on a guide rail brake units acting on friction hydraulic actuators in the form of brake piston, and an associated pressure generating device.
5 an elevator car brake device with a safety device designed for securing two directions of travel of the elevator car, with actuators acting on the brake wedges of the safety gear and with a pressure generating device which can be actuated in both directions by the speed governor rope with two pressure chambers per travel direction.
6 an elevator car brake device, comprising two brake units acting on a respective guide rail with friction elements and hydraulic actuators acting on these friction elements in the form of brake pistons, and a pressure generating device which can be actuated in both directions of travel by the speed governor cable.
1 shows a schematic representation of an elevator system according to the invention 101 with one on guide rails 102 guided elevator car 103 , The elevator system is equipped with an elevator car brake device 104 equipped, the two with the guide rails 102 interacting and at the elevator cabin 103 fixed brake units 105 with hydraulic actuators 106 , a speed limiter 107 with a speed governor rope 108 and a hydraulic pressure generating device 110 includes.
As brake units 105 be in the illustrated elevator system 101 two only for braking the elevator car 103 used in downhill designed safety gear, which are attached to the elevator car (there is only one of the safety gears shown). The brake units 105 (Safety gears) comprise clamping elements designed as catching wedges 112 when triggering a braking operation by the hydraulic actuators 106 between narrowing guides 113 raised on the housing of the safety gear and thereby body with a stationary brake - in the present case with a guide rail 102 the elevator car - be brought into frictional contact. As is the elevator car 103 with the brake units 105 opposite the guide rails 102 moved downwards, causes the frictional contact between the clamping elements 112 and the guide rails 102 in that the clamping elements are further raised by frictional force up to an upper stop. The narrowing guides 113 cause thereby, that the clamping elements 112 against the guide rails 102 be pressed, creating a lift car 103 braking frictional force is generated. Not shown elastic elements ensure a defined contact pressure and thus a defined braking force.
The speed limiter 107 is permanently installed in an end region of an elevator shaft, not shown, and has a sheave 107.1 on, which together with an installed in the opposite end of the elevator shaft rope tensioner 109 a speed limiter rope 108 leads. The speed governor rope 108 wraps around the pulley 107.1 and the rope tensioner 109 , Wherein his two Seiltrume extend at least over the entire route of the elevator car. One of the two rope chambers of the speed limiter rope 108 is with the at the elevator car 103 attached hydraulic pressure generating device 110 connected and moves in normal operation of the elevator system synchronously with the elevator car. The speed limiter 107 is designed to be his pulley 107.1 and thus the speed governor rope 108 be blocked when the peripheral speed of the pulley, or the speed of the speed limiter rope exceeds a defined value. The blocking of the pulley 107.1 and the speed governor rope 108 but can also be effected in the presence of other impermissible operating conditions, preferably by an electromagnetically activated by a controller blocking device on the speed limiter 107 , Impermissible operating states are, for example, the mentioned overspeed, the drifting away or the unintentional driving away of the elevator car 103 from a stop position on a floor, or an insufficiently reduced speed of the traveling elevator car in a shaft end area.
2 shows a more detailed account of related 1 mentioned pressure generating device 110 and the hydraulic actuators 106 the brake units 105 (Safety gear). The pressure generating device 110 In the illustrated embodiment, it includes a pumping device in the form of a hydraulic fluid cylinder filled with hydraulic fluid 110.1 , This includes a hollow cylinder 110.1.1 , two cylinder covers 110.1.2 . 110.1.3 , a continuous piston rod 110.1.4 and a pump piston fixed on the piston rod 110.1.5 , The pump piston and the piston rod are in the hollow cylinder 110.1.1 displaceable, the pump piston 110.1.5 by an elastic return element in the form of a compression spring 110.1.6 yielding against the lower cylinder cover 110.1.3 is biased to ensure that in normal operation of the elevator system, during acceleration or deceleration of the elevator car, not by the inertia of the speed governor rope 108 in the pressure generating device 110 is moved. The continuous piston rod 110.1.4 is with the speed governor rope 108 coupled, in each case one end of the piston rod - for example by means of a cable press connection - with one end of the speed limiter rope 108 connected is. The pressure generating device 110 also includes a pressurized fluid reservoir 110.2 that with the between the pump piston 110.1.5 and the cylinder cover farther away from this 110.1.2 existing pressure chamber 110.1.7 the pressure generating device 110 connected is. You can also see two manually releasable check valves 110.3 . 110.4 on the one hand serve to control the pressure fluid in the operation of the pressure generating device and on the other hand after a braking operation to prevent the backflow of the hydraulic fluid from the hydraulic actuators until this backflow is deliberately caused by manual actuation of the unlocking of the check valves.
The named pressure chamber 110.1.7 the pressure generating device 110 is over interconnections 111 with the pressure chambers of the hydraulic actuators 106 connected to which the brake units 105 forming safety gears are present. Each of the hydraulic actuators 106 comprises a hollow cylinder closed at both ends 106.1 and an actuator piston disposed therein 106.2 , which has an actuator piston rod 106.3 a clamping element 112 the brake units 105 can lift. By lifting the clamping elements by means of the hydraulic actuators, the clamping elements of the brake units 105 activated when the hydraulic fluid from the Pressure generating device in the pressure chambers 106.5 the actuators 106 is pressed.
When an impermissible operating state occurs during a downward movement of the elevator car 103 becomes the speed governor rope 108 through the speed limiter 107 blocked. This will cause the piston rod 110.1.4 and the pump piston 110.1.5 the pressure generating device moving synchronously with the elevator car 110 so in the hydraulic cylinder 110.1 moved that pressure fluid out of the pressure chamber 110.1.7 displaced and to the hydraulic actuators 106 the brake units 105 is passed to the elevator car. Due to the pressure of the displaced pressure fluid, the actuator pistons move 106.2 against a return spring 106.4 and thereby lift over their actuator piston rods 106.3 the clamping elements 112 the brake units 105 what finally the braking of the elevator car 103 entails.
3 shows an elevator car brake device 304 , the same braking units 105 and a similar, from the speed governor rope 108 actuated pressure generating device 310 has, as with the 1 and 2 illustrated elevator car brake device 104 , In contrast to the latter, the in 3 illustrated pressure generating device 310 a hydraulic cylinder acting as a pumping device 310.1 with two separate pressure chambers 310.1.7 and 310.1.8 on, in each of the two pressure chambers depending on a pump piston 310.1.5.1 . 310.1.5.2 is arranged and both pump pistons on the same piston rod 310.1.4 are fixed. Each of the two pressure chambers 310.1.7 and 310.1.8 is via a separate connection line with the hydraulic actuator or the actuators 106 each one of the two brake units 105 connected. This embodiment of the elevator installation according to the invention has the advantage that when the speed governor cable is blocked in the event of an impermissible operating state, the two brake units (safety gear) usually mounted on each side of the elevator car are necessarily synchronously activated, since the actuators of each brake unit, which in the case of brake units, are in the form From catching devices make relatively large activation paths, the same amount of pressurized fluid is supplied at the same time. This avoids such a braking that the elevator car or the guide rails is exposed to unacceptably high loads due to not acting on both sides of the elevator car simultaneously braking forces. The illustrated pilot-operated check valves 310.3.1 and 310.3.2 prevent relieving the hydraulic actuators when the pressure in the pressure generating device 310 decreases after braking. For intentional relief of the hydraulic actuators are each the check valves 310.3.1 and 310.4.1 respectively. 310.3.2 and 310.4.2 manually unlock together.
4 shows an elevator car brake device 404 with one of the speed governor rope 108 actuated pressure generating device 110 and two brake units 405 each of which is a hydraulic actuator 406 having. Each actuator includes one in a hollow cylinder 406.1 arranged Aktuatorkolben 406.2 and two friction elements in the form of brake plates 415 , The actuator piston and the two brake plates are in a brake housing 416 installed, in which also the hollow cylinder 406.1 is integrated. The brake housing 416 the brake units 405 are at the elevator car, not shown here - horizontally slightly displaceable - fixed, wherein the brake housing 416 a guide rail forming a stationary brake body 102 at least partially engages with opposing braking surfaces. The two brake plates 415 are arranged in the brake housing, that each one of them each one of the braking surfaces of the guide rail 402 is opposite, so that each of the brake plates is pressed against its associated braking surface when the Aktuatorkolben 406 pressurized liquid is applied to one of the brake plates 415 suppressed.
The pressure generating device 110 corresponds to the one related to above 1 . 2 is described. To recognize here are two manually unlockable check valves 110.3 . 110.4 on the one hand, the control of the pressure fluid in the operation of the pressure generating device 110 serve and on the other hand, after a braking operation, the fluid pressure in the hydraulic actuators 406 maintained until the actuators are deliberately relieved of the fluid pressure by manual operation of the release of said check valves.
5 shows an elevator car brake device 504 with one of the speed governor rope 108 actuated pressure generating device 510 , and two braking units acting on the descent of the elevator car ( 505A ) and two braking units acting upwards 505B , which are in the form of downwards or upwards acting safety gears. One downwards acting lower one ( 505A ) and an upward acting upper ( 505B ) Safety gear are in a common catch housing 514 installed, each with a catch housing on each side of the elevator car 103 is attached. For braking when traveling in the downward direction through the lower safety gears ( 505A ) are higher than those for uphill braking through the upper safety gears ( 505B ) generated braking forces. To activate a braking operation in the downward direction is each of the lower brake units 505A (Safety gears) with two hydraulic actuators 506A , and for activating an upward braking operation, each of the upper brake units (safety gears) with two actuators 506B equipped. The actuators 506A solve the braking process in the downward direction by lifting the clamping elements 512A (Catch wedges) of the lower safety gears 505A off, and the actuators 506B solve the braking process in the upward direction by lowering the clamping elements 512B the upper safety gears 505B out. The triggering process is related to above 1 and 2 described.
To activate the hydraulic actuators 506A and 506B is also in this embodiment of the invention, a pressure generating device 510 present, with blocked speed limiter cable 108 is operated due to the existing between this and the moving elevator car relative movement. The pressure generating device 510 according to 5 comprises a hydraulic cylinder acting as a pumping device and filled with hydraulic fluid 510.1 with a continuous piston rod 510.1.4 and a hollow cylinder 510.1.1 which is divided into two separate cylinder chambers, wherein in each of the cylinder chambers on the continuous piston rod 510.1.4 fixed pump piston 510.1.5 is arranged. Thus, the pressure generating device 510 in both directions of travel of the elevator car through the blocked Geschwindigkeitsbegrenzerseil 108 can be actuated, which is coupled to the speed governor cable piston rod 510.1.4 by a spring centering device 520 resiliently fixed in a middle position, in which the two mounted on the piston rod pump piston 510.1.5 in the middle of the length of the respective associated cylinder chambers of the hydraulic cylinder 510.1 are positio ned. The spring centering device 520 ensures that a higher force is required for deflecting the piston rod and the two pump pistons, as the force that is to be transmitted to accelerate or decelerate the speed governor cable via the piston rod on this. The pressure generating device 510 , or the hydraulic cylinder 510.1 , Have two cylinder chambers and two coupled pumping piston, so that it can be ensured that the two - usually mounted on each side of the elevator car - brake units 505 (Safety gears) can be activated synchronously, as already related to 3 is described.
When an impermissible operating state occurs during a downward travel of the elevator car, the speed limiter cable becomes 108 blocked. This will cause the piston rod 510.1.4 and the two pump pistons 510.1.5 the pressure generating device moving with the elevator car 510 in the hydraulic cylinder 510.1 shifted upward so that the pressure fluid from the two each above the pump piston lying pressure chambers 510.1.7 . 510.1.8 displaced and over interconnections 511A the lower hydraulic actuators 506A the lower brake units 505A (Safety gears) is supplied. When blocking the overspeed governor rope 108 as a result of an impermissible operating state during an upward drive, the piston rod becomes 510.1.4 and the two pump pistons 510.1.5 in the hydraulic cylinder 510.1 shifted down so that the pressure fluid from the two each below the pump piston lying pressure chambers 510.1.9 . 510.1.10 displaced and over interconnections 511B the upper hydraulic actuators 506B the two upper brake units 505B (Safety gears) is supplied.
Above the pressure generating device 510 is a pressurized fluid reservoir 510.2 recognizable, the four connection lines, each with a pilot-operated check valve 510.4 with the pressure chambers 510.1.7 - 510.1.10 of the hydraulic cylinder 510.1 connected is. On the one hand, the check valves make it possible to draw in pressure liquid into the pressure chambers, and on the other hand they prevent the pressure generating device from being actuated 510 Pressure fluid from the one brake unit associated hydraulic system in the other brake unit associated system can flow. As a result, the synchronous activation of each lower or respectively all upper hydraulic actuators of both brake units remains ensured.
6 shows a further embodiment of an elevator car brake device 604 that one of the speed governor rope 108 actuated pressure generating device 610 and two attached to the elevator car, not shown, brake units 605 includes. The brake units 605 and their hydraulic actuators 606 are identical to those related to 4 described braking units 405 and actuators 406 , Unlike the brake units 405 according to 4 serve the in 6 illustrated braking units 605 for braking the elevator car in the event of inadmissible operating conditions during downward as well as upward driving of the elevator car. The pressure generating device 610 is therefore designed so that when driving downwards as in the upward movement of the elevator car by the speed governor rope 108 can be operated. It is essentially the one related to 5 described pressure generating device 510 and also has a spring centering device 620 on which the piston rod 610.1.4 with the pump piston 610.1.5 resiliently fixed in a central position, from which the piston rod and thus the pump piston only by the relatively large force of the blocked speed governor rope 108 can be moved up or down.
In contrast to the hydraulic cylinder 510.1 the pressure generating device according to 5 , points the hydraulic cylinder 610.1 the pressure generating device 610 according to 6 only a single cylinder chamber, in which a single, on the piston rod 610.1.4 fixed pump piston 610.1.5 is arranged. The above or below the pump piston lying pressure chambers 610.1.7 respectively. 610.1.9 of the hydraulic cylinder 610.1 are each via a connecting line 611A respectively. 611B , each with a check valve 610.3 lead, with a common connection line 611C connected to each of the hydraulic actuators 606 both brake units 605 communicates. Unlike the in 5 shown braking units 505 , in which the braking force is generated by slips, is a double arrangement of cylinder chambers and pump piston when using the in 6 shown braking units 605 not mandatory. Because with these brake units 605 the braking forces are generated by friction elements 615 through actuator piston 606.2 , which are subjected to the same fluid pressure, to stationary brake body 102 Pressed, the braking forces occur in all brake units 605 mandatory at the same time and in the same strength.
To the by the brake units 605 limited braking forces are in both connecting lines 611A . 611B that the pressure chambers 610.1.7 . 610.1.9 the pressure generating device 610 with a common connecting line leading to the hydraulic actuators 611.C connect, adjustable pressure control valves 621.1 . 621.2 built-in. Each of the two pressure chambers of the pressure generating device is thus assigned a pressure control valve, so that upon the occurrence of an impermissible operating state and consequent blocking of the speed governor rope 108 Depending on the direction of travel of the elevator car different levels of braking forces can be generated. The setting of the pressure control valves 621.1 . 621.2 can be done manually via a set screw. Preferably, however, pressure control valves are used in which the height of the secondary maximum occurring fluid pressure by a control device 622 is controllable. Advantageously, the control device regulates 622 the maximum pressure on the secondary side of the pressure control valves as a function of the current load in the elevator car by a conventional load measuring device 623 is detected or as a function of the during the braking operation of the elevator car by a deceleration measuring device 624 detected delay. Ideally, in the by the control device 622 performed calculation of the pressure setpoint for the pressure control valves 621.1 . 621.2 the measured values of both measuring devices are included.
Also in the pressure generating device 610 according to 6 are different check valves 610.3 . 610.4 . 610.5 available. The check valves 610.3 have the task of preventing the premature drop in the brake pressure in the hydraulic actuators of the brake units. At the same time, they decouple the pressure chamber 610.1.7 and the pressure control valve 621.1 comprehensive pressure generating area for braking when driving down from the pressure chamber 610.1.9 and the pressure control valve 621.2 comprehensive pressure generating area for braking when driving upwards. The check valves 610.4 allow the sucking of pressure fluid from the pressure fluid reservoir 610.2 , And they also prevent the mutual influence of the two pressure generating areas. The pilot operated check valve 610.5 serves to relieve the hydraulic actuators of the pressure of the hydraulic fluid when the cause of the improper operating condition has been eliminated.
In order to maintain the brake pressure in the hydraulic actuators for a long time, it is advantageous to have a small accumulator 625 with the common connection line 611.1 connect to. This measure can also with the elevator car brake according to the 2 - 5 be applied.
The in connection with the elevator car brake devices according to 2 - 6 disclosed pilot operated check valves can of course also be equipped with electromagnetic unlocking to allow a more comfortable remote control.
Brakes are heavy or fast moving elevator cars
with the inventive
Aufzugskabinenbremseinrichtungen also several parallel arranged
Braking units activated. In the case of safety gears as brake units
It may be useful, their hydraulic actuators by a
Pressure generating device with a plurality of cylinder chambers and pump piston
For generating the fluid pressure by the blocked speed limiter cable, other embodiments of pressure generating devices are also applicable. For example, a rotary pump via a pulley be operated by the speed governor rope. The pump piston of a hydraulic cylinder could also be driven by means of pulley and threaded spindle or via a lever-toothed rack and pinion system.