EP2963218B1 - Blocking device of a locking sequence controlling device of a two-leaf rotating door assembly - Google Patents

Description

The invention relates to a blocking device for a closing sequence control device of a two-leaf revolving door system according to the preamble of patent claim 1.

From the DE 10 2006 028 875 B3 a device for controlling the closing sequence of a two-leaf revolving door system is known, which has an overturning leaf and an underpowering leaf. The active leaf and the inactive leaf are each operatively connected to an output shaft of a drive device. Furthermore, a blocking device is provided, by means of which the active leaf can be blocked or released, depending on the position of the passive leaf, by having a coupling point for a mechanical transmission element. The blocking device acts on a movable component of the drive device of the active leaf by having a brake drum coupled to the movable component via a freewheel bearing. The brake drum is encompassed by a one-piece brake pad, which is spring-loaded against the brake drum. The pivoting of a spreading element releases the brake pad from the brake drum.

From the EP 1 870 551 A2 EP-A-0 416 831 discloses a blocking device for a door-follower of a two-leaf revolving door system which blocks or releases a moving leaf depending on the position of a passive leaf by acting on a motor shaft of a drive motor of the driving device of the active leaf. The actuating device is designed as a tilting element and is moved by a transmission element. An overload protection is not integrated here.

The invention has for its object to provide a reliable and self-adjusting in wear blocking device for a closing sequence control device of a two-leaf revolving door system.

The object is solved by the features of patent claim 1.

The subclaims form advantageous embodiments of the invention.

According to the invention, the blocking device has a first brake element embodied as a brake cone on which at least one brake segment of a rotatable and axially displaceable pressure element acts, which is pressed axially in the direction of the brake cone by a pressure spring and blocks a rotational movement of the motor shaft in the closing direction, wherein the mechanical transmission element in the release position, the pressure member against the force of the pressure spring axially moved away from the brake cone, so that the at least one brake segment lifts off from the brake cone and releases the rotational movement of the motor shaft in the closing direction. As a result, an extremely reliable construction is achieved, wherein the blocking device is self-adjusting when worn.

In embodiments of the blocking device according to the invention for a closing sequence control device of a two-leaf revolving door system includes the brake cone on the motor shaft freewheel and is plugged depending on the direction of rotation corresponding to the motor shaft. According to the invention an overload protection is triggered by a rotation of the pressure member under load by a arranged on the pressing part run-up ramp runs on a stationary run-up ramp when a predetermined torque threshold is reached, so that the at least one brake segment lifts from the brake cone and releases the rotational movement of the motor shaft in the closing direction. The release torque of the overload protection can be adjusted by adjusting a bias of a release spring, which is in operative connection with the pressure member and a stationary stop web. Here, the pressure member can be rotated against the force of the release spring. Due to the overload protection damage to the revolving door system can be prevented in an advantageous manner.

In a further advantageous embodiment, the pressure part can be mounted rotatably and axially displaceably via a guide sleeve in a guide opening of a base part, wherein the coupling point for the mechanical transmission element is arranged at the bottom of the guide sleeve. The pressure spring may be formed, for example, as a helical compression spring, which at one end supported at the bottom of the guide sleeve and the other end at the bottom of the guide opening, through which the mechanical transmission element is guided.

In a further advantageous embodiment, the pressure member can be executed symmetrically to the vertical axis and have two brake segments, which are arranged opposite to each other and each act on an angular segment of the brake cone, which is smaller than 90 °.

In a further advantageous embodiment, an electric brake device with a lifting magnet and a rotatable and axially displaceable brake block can be provided which has at least one brake segment. Here, the solenoid in the energized braking state, the brake block press via an actuating plunger against the force of a return spring axially toward the brake cone and block a rotational movement of the motor shaft in the closing direction, the return spring can move the brake block in the de-energized state of the solenoid axially from the brake cone, so that the lifts at least one brake segment from the brake cone and releases the rotational movement of the motor shaft in the closing direction. This advantageously allows a modular blocking device with an electrical braking function. Thus, for example, a base part can be arranged on a connecting flange mounted on the electric motor, via which the blocking device for the integrated closing sequence control (IS) and the electric brake can be modularly assembled. On the mounted on the motor shaft cone-shaped friction disc, which includes a sleeve freewheel for Bremsrichtungsbestimmung pushes either the integrated closing sequence control (IS) on the blocking device or the electric brake.

In a further advantageous embodiment, the brake block can be rotatably and axially displaceably mounted on a rounded guide surface of the base part via a rounded recess, wherein the actuating tappet can act on an actuating plate of the brake block.

In a further advantageous embodiment, the brake block can be executed symmetrically to the vertical axis and have two brake segments, which are arranged opposite to each other and each act on an angular segment of the brake cone, which is smaller than 90 °. The brake block and the pressure member can be arranged so that the brake segments of the pressure member and the brake segments of the brake block alternate at the periphery of the brake cone. This allows a particularly compact design of the blocking device with integrated electric brake.

In a further advantageous embodiment, the overload protection can be triggered by a rotation of the brake block under load by the brake block acts on the pressure member and this rotated when a predetermined torque threshold is reached. Here, the twisted pressure member actuate a microswitch, which interrupts a power supply to the magnet, so that the return spring axially move the brake block in the de-energized state of the magnet from the brake cone, so that the at least one brake segment of the brake block from the brake cone and lift the rotational movement of the motor shaft Closing direction can release.

Embodiments of the invention advantageously allow a modular blocking device with an electric brake. In this case, the overload torque can be set both for the electric brake and for the blocking device of the integrated closing sequence control (IS). As a result, damage can be prevented or a safe operation of the door system can be made possible. The blocking device of the integrated closing sequence control (IS) can be lifted or released either by the mechanical transmission element or by the ramps. The electric brake is based on the integrated closing sequence control (IS) and thus uses their torque setting to cancel the braking effect in case of overload on the microswitch.

Embodiments of the invention will be explained in more detail with reference to drawings. In the drawings, like reference numerals designate components that perform the same or analog functions.

Fig. 1

eine zweiflügelige Drehtüranlage mit einer Schließfolgeregelungsvorrichtung in Frontansicht;

Fig. 2

eine perspektivische Ansicht eines ersten Ausführungsbeispiels einer erfindungsgemäßen Blockiereinrichtung für die Schließfolgeregelungsvorrichtung einer zweiflügeligen Drehtüranlage aus Fig. 1;

Fig. 3

eine Draufsicht auf das erste Ausführungsbeispiel einer erfindungsgemäßen Blockiereinrichtung aus Fig. 2;

Fig. 4

eine Frontansicht des ersten Ausführungsbeispiels einer erfindungsgemäßen Blockiereinrichtung aus Fig. 2 oder 3;

Fig. 5

eine Schnittdarstellung des ersten Ausführungsbeispiels einer erfindungsgemäßen Blockiereinrichtung entlang der Schnittlinie V-V in Fig. 4;

Fig. 6

eine perspektivische Ansicht eines zweiten Ausführungsbeispiels einer erfindungsgemäßen Blockiereinrichtung für die Schließfolgeregelungsvorrichtung einer zweiflügeligen Drehtüranlage aus Fig. 1;

Fig. 7

eine Draufsicht auf das zweite Ausführungsbeispiel einer erfindungsgemäßen Blockiereinrichtung aus Fig. 6;

Fig. 8

eine Frontansicht des zweiten Ausführungsbeispiels einer erfindungsgemäßen Blockiereinrichtung aus Fig. 6 oder 7; und

Fig. 9

eine Schnittdarstellung des zweiten Ausführungsbeispiels einer erfindungsgemäßen Blockiereinrichtung entlang der Schnittlinie IX-IX in Fig. 8.

Showing:

Fig. 1

a two-leaf revolving door system with a closing sequence control device in front view;

Fig. 2

a perspective view of a first embodiment of a blocking device according to the invention for the closing sequence control device of a two-leaf revolving door system Fig. 1 ;

Fig. 3

a plan view of the first embodiment of a blocking device according to the invention from Fig. 2 ;

Fig. 4

a front view of the first embodiment of a blocking device according to the invention from Fig. 2 or 3 ;

Fig. 5

a sectional view of the first embodiment of a blocking device according to the invention along the section line VV in Fig. 4 ;

Fig. 6

a perspective view of a second embodiment of a blocking device according to the invention for the closing sequence control device of a two-leaf revolving door system Fig. 1 ;

Fig. 7

a plan view of the second embodiment of a blocking device according to the invention from Fig. 6 ;

Fig. 8

a front view of the second embodiment of a blocking device according to the invention from Fig. 6 or 7 ; and

Fig. 9

a sectional view of the second embodiment of a blocking device according to the invention along the section line IX-IX in Fig. 8 ,

The Fig. 1 shows a two-leaf revolving door system 1 with a sweeping walking leaf 2 and a unterschlagenden stationary leaf 3, which are mounted on hinge-like fittings 4 about a respective vertical axis of rotation rotatably mounted on a stationary door frame 5. The active leaf 2 and the inactive leaf 3 are each operatively connected to a drive device 6, 7 designed as a revolving door drive, which are mounted in the illustrated embodiment in the upper horizontal region of the door frame 5.

In the housings 8, 9 of the drive means 6, 7 are each designed as output shaft 10, 11 formed with vertical axes of rotation output members, wherein the ends of the output shafts 10, 11 protrude from the housings 8, 9 respectively. At the bottom, i. the active leaf 2 and the inactive leaf 3 facing the end of the output shafts 10, 11 are each mounted as a sliding arm 12, 13 trained power transmission elements rotatably. The other end of the sliding arm 12, 13 is in each case guided linearly displaceably by means of a slider in each case in a sliding rail 14, 15 mounted in the region of the upper horizontal edge of the active leaf 2 or of the stationary leaf 3. A rotational movement of the output shaft 10, 11 of the drive means 6, 7 causes the sliding arm 12, 13 is pivoted and the active leaf 2 and the inactive leaf 3 are moved over the slide guided in the slide rail 14, 15.

The drive devices 6, 7 each have a control device, not shown here, which controls the movement of the drive means 6, 7, e.g. depending on sensor signals and / or manual switching operations. The control device may comprise a memory device in which the parameters required for operating the drive devices 6, 7 can be stored non-volatilely.

A device for regulating the closing sequence has the effect that, when the inactive leaf 3 is not in its closed position, the active leaf 2 can not be moved in the closing direction but remains in the at least partially open position until the inactive leaf 3 has reached its closed position. For this purpose, a blocking device 20, 20A is provided in the drive device 6 of the active leaf, which below with reference to Fig. 2 to 9 will be described in more detail. The drive device 6 has an electric drive motor 16, the motor shaft 17 protruding from the drive motor 16 on both sides. On one side, the drive motor 16 can cooperate with a gear, not shown. The gear cooperates with the output shaft 10 of the drive device 6, so that a rotational movement of the motor shaft 17 causes a geared by the transmission rotational movement of the output shaft 10. In addition, a closing spring is provided which is biased by the drive motor 16 operated in the opening direction. When the energization of the drive motor 16 is terminated, the closing spring then relaxes again and causes a rotational movement of the output shaft 10 of the drive device 2 in the closing direction.

In principle, a determination of the output shaft 10 of the drive device 6 in at least partially open position of the connected wing only by the drive motor 16 is possible by the drive motor 16 remains permanently energized after reaching this position of the output shaft 10 and thus generates a force of the closing spring compensating counterforce. As a result, however, a high power consumption and possibly also a disturbing noise emission would be incurred by the stationary power motor 16 stopped.

In order to avoid this disadvantage, a blocking device 20, 20A is provided on the front side of the drive motor 16, which then interacts with the motor shaft 17 of the drive motor 16. How out Fig. 2 to 9 It can also be seen that the illustrated embodiments of the blocking device 20, 20A according to the invention for a closing sequence control device of a two-leaf revolving door system 1 block or release the moving leaf 2 depending on the position of the passive leaf 3, in each case having a coupling point 21 for a mechanical transmission element 18 the motor shaft 17 of the drive motor 16 of the drive device 6 of the active leaf 2 act by having a with the motor shaft 17 via a freewheel bearing 19.1 coupled first brake element 19. According to the invention, the first brake element designed as a brake cone 19, on which at least one brake segment 35, 36 of a rotatable and axially displaceable pressure member 30 acts, which is pressed in the blocking state of a pressure spring 39 axially in the direction of the brake cone 19 and blocks a rotational movement of the motor shaft 17 in the closing direction. Here, the mechanical transmission element 18 moves in the release position, the pressure member 30 against the force of the pressure spring 39 axially away from the brake cone 19, so that the at least one brake segment 35, 36 lifts off the brake cone 19 and the rotational movement of the motor shaft 17 releases in the closing direction.

The transmission element 18 shown here only in sections, which may be designed as a thrust member, such as a push rod or Bowden cable is, as well as the blocking device 20, 20A, a part of the device for controlling the closing sequence and extends to the inactive leaf 3, in particular to a In the illustrated position of the pressure member 30, the blocking device 20, 20A in its the movement of the motor shaft 17 blocking state. The achievement of the closed position of the inactive leaf 3 leads to a displacement of the transmission element 18 and thus to an axial displacement of the pressure member 30, whereby the blocking device 20, 20A, the movement of the motor shaft 17 releases and the active leaf 2 can then be closed by relaxation of the closing spring.

Fig. 2 to 5 show a first embodiment of the blocking device 20, wherein of the drive device 6 of the active leaf 2, for the sake of clarity, only the drive motor 16 is shown with the motor shaft 17 here. A connecting flange 22, which carries the components of the blocking device 20, is used to connect the blocking device 20 to the drive motor 16. In the illustrated embodiment, the connecting flange 22 has an L-shape, wherein the connecting flange 22 is connected to the drive motor 16 on a first leg , On a second leg, which is perpendicular to the first leg, the connecting flange 22 has a base part 24 with a guide opening 25 on, in which the pressure member 30 is rotatably mounted and axially displaceable via a guide sleeve 38. The coupling point 21 for the mechanical transmission element 18 is arranged at the bottom of the guide sleeve 38. The pressure spring 39 is formed in the illustrated embodiment as a helical compression spring and is supported at one end at the bottom of the guide sleeve 38 and the other end at the bottom of the guide opening 25, through which the mechanical transmission element 18 is guided. In addition, the pressure member 30 is designed symmetrically to the vertical axis z and has two brake segments 35, 36, which are arranged opposite to each other and each act on an angular segment of the brake cone 19, which is smaller than 90 °. The brake segments 35, 36 have the brake cone 19 facing beveled braking surfaces and are connected via angled connecting elements with the guide sleeve 38.

How out Fig. 2 to 5 can be seen, an overload protection by a rotation of the pressure member 30 is triggered under load by a arranged on the pressing member 30 Auflaufsteg 37 runs on a stationary ramp 14 when a predetermined torque threshold is reached, so that the at least one brake segment 35, 36 from the brake cone 19 lifts off and releases the rotational movement of the motor shaft 17 in the closing direction. The ramp 28 is formed on the first leg of the connecting flange 22 and is substantially perpendicular from the first leg of the connecting flange 22 from. Thus, the overload protection is effective in both directions of rotation of the pressure member 30, the pressure member 30 has two casserole webs 37, which cooperate with each one arranged on the first leg of the connecting flange 22 ramp 28. A release torque of the overload protection is adjustable by adjusting a bias of a release spring 34, which is arranged in a receiving bore 32 of a setting block 31. The release spring 34 is connected via an adjusting screw 33 and the adjusting block 31 in operative connection with the pressing member 30 and a stationary stop web 26 which protrudes substantially perpendicularly from the first leg of the connecting flange 22, in operative connection with the connecting flange 22. The bias of the release spring 34 is over the adjusting screw 33 adjustable, which is screwed into an internal thread of the receiving bore. The pressure member 30 is rotatable against the force of the release spring 34. Thus, the overload protection is effective in both directions of rotation, the pressure member 30 has two adjustment blocks 31 with corresponding mounting holes, trigger springs 34 and adjusting screws 33, wherein the stop web 22 is disposed between the two Einstellblöcken 31, that the release springs 34 each on a side surface of the Support ridge 22 can support.

Fig. 6 to 9 show a second embodiment of the blocking device 20A, wherein here, for the sake of clarity, of the drive means 6 of the active leaf 2, only the drive motor 16 is shown with the motor shaft 17. In addition to referring to Fig. 2 to 5 Components already described, the blocking device 20A in the illustrated second embodiment, an electric braking device 40 with a solenoid 41 and a rotatable and axially displaceable brake block 44, which has at least one brake segment 45, 46. The electric braking device 40 is provided for determining the active leaf 2, when the integrated closing sequence control (IS) due to the position of the inactive leaf 3, a movement of the active leaf 2 releases, ie if the mechanical transmission element 18 in the release position, the pressure member 30 against the force of the pressure spring 39th moved axially away from the brake cone 19, so that the at least one brake segment 35, 36 is lifted from the brake cone 19 and the rotational movement of the motor shaft 17 is released in the closing direction. The solenoid 41 presses in the energized braking state, the brake block 44 via an actuating plunger 42 against the force of a return spring 43 axially toward the brake cone 19 and blocks a rotational movement of the motor shaft 17 in the closing direction. In the de-energized state of the solenoid 41, the return spring 43 moves the brake block 44 axially away from the brake cone 19, so that the at least one brake segment 45, 46 lifts off from the brake cone 19 and releases the rotational movement of the motor shaft 17 in the closing direction.

Analogously to the first exemplary embodiment, the connecting flange 22 carries the components of the blocking device 20A and serves to connect the blocking device 20A to the drive motor 16. In the illustrated second exemplary embodiment, the connecting flange 22 has an L-shape, wherein the connecting flange 22 on the first leg with the drive motor 16 is connected and on the second leg, the base member 24 having the guide opening 25, in which the pressure member 30 is rotatably mounted and axially displaceable via a guide sleeve 38. How out Fig. 6 to 9 It can also be seen that, in addition to the pressure part 30, the brake block 44 is rotatably and axially displaceably mounted on a rounded guide surface 24. 1 of the base part 24 via a rounded recess 44. The actuating tappet 42 acts on an actuating plate 47 of the brake block 44. The actuating plate 47 is supported on a flattening of the base part 24 and is arranged in the z-direction above the recess 44.1, so that the brake block 44 can perform the axial sliding movement. The solenoid 41 with actuating plunger 42 and return spring 43 is arranged on a flattened upper side of the base part 24. Also, the brake block 44 is executed symmetrically to the vertical axis z and has two brake segments 45, 46, which are arranged opposite one another and which have the brake cone 19 facing beveled braking surfaces. The braking surfaces each act on an angular segment of the brake cone 19, which is smaller than 90 °. How out Fig. 6 to 9 can be seen, the brake block 44 and the pressure member 30 are arranged so that the braking segments 35, 36 of the pressure member 30 and the brake segments 45, 46 of the brake block 44 alternate at the periphery of the brake cone 19.

How out Fig. 6 to 9 can be seen, the electric braking device 40 uses the overload protection of the pressure member 30 with. This means that the overload protection can be triggered by a rotation of the brake block 44 under load by the brake block 44 acts on the pressure member 30 and this rotated when a predetermined torque threshold is reached. The rotated pressing member 30 actuates a microswitch 48, 49, which interrupts a power supply to the holding magnet 41, so that the return spring 43, the brake block 44 in de-energized state of the holding magnet 41 is axially moved away from the brake cone 19, so that the at least one brake segment 45, 46 of the brake block 44 lifts off the brake cone 19 and releases the rotational movement of the motor shaft 17 in the closing direction. Thus, the overload protection is effective in both directions of rotation in the second embodiment of the blocking device 20A, the pressure member 30 also here two Einstellblöcke 31 with corresponding mounting holes, release springs 34 and adjusting screws 33, wherein the stop web 22 is disposed between the two Einstellblöcken 31 that the release springs 34 can each be supported on a side surface of the stop web 22. In addition, two two micro-switches 48, 49 are arranged on the pressing member 30, the actuating elements are triggered by a corresponding rotational movement in the direction of stop ridge 22.

The second embodiment provides a combined modular blocking device 20A with an electric braking device 40 for a closing sequence control device of a two-leaf revolving door system 1, which is characterized in that the overload torque is adjustable for both the electric braking device 40 and the integrated closing sequence control (IS) is and thus prevents damage or is safe to operate.

On the attachment flange 22 attached to the drive motor 16 with the base part 24, the pressing part 30 of the integrated closing sequence control (IS) and the electric braking device 40 are modularly assembled. By mounted on the motor shaft 17 cone-shaped friction plate 19, which includes the sleeve freewheel 19.1 for Bremsrichtungsbestimmung either presses the pressure member 30 of the integrated closing sequence control (IS) or the brake block 44 of the electric braking device 40. The integrated closing sequence control (IS) can either by the mechanical Transfer element 18 or lifted or released by the ramps 28. The brake block 44 of the electric brake device 40 is supported on the pressure part 30 of the integrated closing sequence control (IS) with and thereby uses their torque setting to cancel the braking effect in case of overload on the micro-switches 48, 49th <B> LIST OF REFERENCES </ b> 1 Revolving door installation 26 stop web 2 leaf 28 leading ramp 3 Fixed leaf 30 presser 4 fitting 31 setting block 5 doorframe 32 location hole 6 driving means 33 adjustment 7 driving means 34 release spring 8th casing 35, 36 brake segment 9 casing 37 baking Steg 10 output shaft 38 guide sleeve 11 output shaft 39 pressure spring 12 sliding arm 40 electric braking device 13 sliding arm 41 solenoid 14 slide 42 actuating ram 15 slide 43 Return spring 16 drive motor 44 brake block 17 motor shaft 44.1 recess 18 transmission element 45, 46 brake segment 19 brake cone 47 operating plate 19.1 freewheel 48, 49 microswitch 20, 20A blocking device 21 coupling point 22 flange 24.1 guide surface 25 guide opening

Claims (10)

1. Blocking device (20, 20A) for a closing sequence control apparatus of a two-leaf revolving door system (1) which has an overstriking active leaf (2) and an understriking passive leaf (3) which are each operatively connected to an output shaft (10, 11) of a drive device (6, 7), wherein the blocking device (20, 20A) blocks or releases the active leaf (2) depending on the position of the passive leaf (3) by the said blocking device having a coupling point (21) for a mechanical transmission element (18), and acts on a motor shaft (17) of a drive motor (16) of the drive device (6) of the active leaf (2) by the said blocking device having a first brake element (19) which is coupled to the motor shaft (17) by means of a freewheeling bearing (19.1) of the blocking device (20; 20A), a contact-pressure part (30) and a contact-pressure spring (39), wherein the first brake element is designed as a brake cone (19) on which at least one brake segment (35, 36) of the rotatable and axially displaceable contact-pressure part (30) acts, which contact-pressure part, in the blocking state of the contact-pressure spring (39), is pushed axially in the direction of the brake cone (19) and blocks a rotary movement of the motor shaft (17) in the closing direction, wherein the mechanical transmission element (18), in the release position, moves the contact-pressure part (30) axially away from the brake cone (19) against the force of the contact-pressure spring (39), so that the at least one brake segment (35, 36) lifts away from the brake cone (19) and releases the rotary movement of the motor shaft (17) in the closing direction, characterized in that the blocking device (20, 20A) has an overload protection means with a run-on web (37) and a stationary run-on ramp (28), which overload protection means can be tripped by rotation of the contact-pressure part (30) under load by the run-on web (37) which is arranged on the contact-pressure part (30) running onto the stationary run-on ramp (28) when a prespecified torque threshold value is reached, so that the at least one brake segment (35, 36) lifts away from the brake cone (19) and releases the rotary movement of the motor shaft (17) in the closing direction.
2. Blocking device according to Claim 1, characterized in that a tripping torque of the overload protection means can be set by setting a prestress of a tripping spring (34), wherein the tripping spring (34) is operatively connected to the contact-pressure part (30) and a stationary stop web (26), wherein the contact-pressure part (30) can be rotated against the force of the tripping spring (34).
3. Blocking device according to one of the preceding claims, characterized in that the contact-pressure part (30) is rotatably and axially displaceably mounted in a guide opening (25) in a base part (24) by means of a guide sleeve (38), wherein the coupling point (21) for the mechanical transmission element (18) is arranged on the base of the guide sleeve (38).
4. Blocking device according to Claim 3, characterized in that the contact-pressure spring (39) is in the form of a helical compression spring which is supported on the base of the guide sleeve (38) at one end and on the base of the guide opening (25) at the other end, the mechanical transmission element (18) being passed through the said base of the guide opening.
5. Blocking device according to one of the preceding claims, characterized in that the contact-pressure part (30) is designed symmetrically in relation to the vertical axis (z) and has two brake segments (35, 36) which are arranged opposite one another and each act on an angular segment of the brake cone (19) which is smaller than 90°.
6. Blocking device according to one of the preceding claims, characterized in that an electrical brake device (40) is provided with a lifting magnet (41) and a rotatable and axially displaceable brake block (44) which has at least one brake segment (45, 46), wherein the lifting magnet (41), in the energized brake state, presses the brake block (44) axially in the direction of the brake cone (19) against the force of a return spring (43) by means of an operating tappet (42) and blocks a rotary movement of the motor shaft (17) in the closing direction, and wherein the return spring (43) moves the brake block (44) axially away from the brake cone (19) in the de-energized state of the lifting magnet (41), so that the at least one brake segment (45, 46) lifts away from the brake cone (19) and releases the rotary movement of the motor shaft (17) in the closing direction.
7. Blocking device according to Claim 6, characterized in that the brake block (44) is rotatably and axially displaceably mounted on a rounded guide face (24.1) of the base part (24) by means of a rounded cutout (44.1), wherein the operating tappet (42) acts on an operating plate (47) of the brake block (44).
8. Blocking device according to Claim 6 or 7, characterized in that the brake block (44) is designed symmetrically in relation to the vertical axis (z) and has two brake segments (45, 46) which are arranged opposite one another and each act on an angular segment of the brake cone (19) which is smaller than 90°.
9. Blocking device according to Claim 8, characterized in that the brake block (44) and the contact-pressure part (30) are arranged such that the brake segments (35, 36) of the contact-pressure part (30) and the brake segments (45, 46) of the brake block (44) alternate over the circumference of the brake cone (19).
10. Blocking device according to one of the preceding Claims 6 to 9, characterized in that the overload protection means can be tripped by rotation of the brake block (44) under load by the brake block (44) acting on the contact-pressure part (30) and rotating the said contact-pressure part when a prespecified torque threshold value is reached, wherein the rotated contact-pressure part (30) trips a microswitch (48, 49) which interrupts a current supply to the holding magnet (41), so that the return spring (43) moves the brake block (44) axially away from the brake cone (19) in the de-energized state of the holding magnet (419, so that the at least one brake segment (45, 46) of the brake block (44) lifts away from the brake cone (19) and releases the rotary movement of the motor shaft (17) in the closing direction.

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