DE8232274U1 - Security door lock - Google Patents

Description

rheinmjetjah, i 1st: ··; * /

iii KeUs s, November 8th, 1982

i Sv / Sch

EL 95 file

Security door lock

The invention relates to a safety door lock the features of the preamble of claim 1.

Safety interlocks on protective devices are known per se, e.g. B. from DIN sheet 31001. When using such locks as a safety door lock, it was previously only possible to bring the individual components of the lock separately from one another according to the sliding path of the protective door on the device to be protected at ¹ . The locking device consisted of two limit switches that came into engagement at a distance from one another on one side of the door and an electromechanical locking device that clicked into place on the other side of the door. In the known devices each limit switch must be actuated once after switching on the voltage by a main switch or after switching on again after a power failure by a control switch in order to make unauthorized bypassing more difficult. With state-of-the-art safety devices, a switch is also required to open and close the door.

The object of the invention is therefore to provide a door locking device to provide for all the components of the safety device and for opening and closing the door can be combined as a unit in a housing. The housing, the two limit switches and a lifting magnet should be used takes up, can be used instead of the usual switch.

It should therefore have its final dimensions, ζ * Β. according to DIN 43697, so that the door lock instead of the usual one Switch can be used for switching on and off * Instead of three previously at locations that were separated from each other anztl'- • 5 Bringing components should therefore only require one component be*

The essential features for solving the task at hand of the invention are mentioned in claim 1. The subclaims name embodiments of the invention *

Claim 1 comprises two embodiments, namely one the embodiment "locked under spring pressure", in which the locking bolt is under spring pressure directed outwards towards the door and, on the other hand, the embodiment: "Locked under current", in which the locking bolt is under inwardly directed spring force.

The drawing shows embodiments of the new switch, namely in

Fig. 1 and 2 mutually perpendicular sections of the embodiment: "Locked under spring pressure", in

3 and 4 corresponding sections of the embodiment: "locked under power" and in

Fig. 5 is a circuit diagram for the embodiment:

"Locked under spring pressure" or, in FIG. 5a, a partial circuit diagram of the embodiment "locked under current". The housing 2 of a conventional switch (FIGS. 1, 2) is provided with a cover 1 with a seal 31. On the housing 2 the usual connection bores 32 and pinning bores 33 are located.

On the side of the housing facing the protective door
the locking bolt 3 is arranged, which is in a sleeve 12
is guided and is connected to a shaped disk 4, which
is under inward pressure of a compression spring 5.
This is achieved in that the shaped washer 4 on the outside
Lock washers 10, 11 is fastened in a spring bearing pot 30. The spring is supported on the housing 2 via an ab- | ' standpipe 8 and rests with its other end on a bent-over edge of the spring bearing pot 30. This spring bearing pot 30 is fastened with a screw 39 to one end of the movable magnet armature 7 of the lifting magnet 6. At the other end of the solenoid g 7 and a ram on the elevating | magnets 7 is the bracket 9 as a limit switch of the second *

Switch 21 with the threaded nut 36 and washer 38 be j solidifies. The bracket 9 is guided in a mounting bracket 29 I

and can with its free end on the switch plunger 17 (Fig. 2) * |

of the switch 21 rest. Fastening screws 27 for f

the solenoid 6 on the housing 2 also hold a support plate ί

28 with spacer tube 34 for the electrical connection terminal I

strip 26 or the mounting bracket 29 * 'i

On the same side of the housing 2 as the locking |. Bolt 3 is the first limit switch as a bolt 13 with plunger J 16 in a sleeve 18. He stands under to the outside world directed spring force of a spring 14. It is from a plate | 15 held and supported with a rear round head
the switch plunger 17 of the first switch 20. The locking bolt 3 and the plunger 16 are secured by rubber seals 35
sealed to the outside. The first switch 20 and one only in
Special cases for exercising additional security functions

Additional switches 20a are arranged on the housing 2 on one side via a lining piece 22 with a cylinder screw 24 | and on the other side by one with a compression spring 23> ' equipped threaded safety hood 25 held adjustable.

The embodiment according to FIGS. 3 and 4: "locked under power" has the difference to FIGS. 1 and 2 that the magnet 6 is installed pivoted by 180 °, so that the lifting magnet 7, whose stroke is limited by a locking washer 40, and by means of a screw 37 and washer is connected to the bracket 9, is advanced in the direction of the door when the voltage is switched on. In this The trap is the one with a locking washer 41 on the locking bolt 3 held shaped disk 4 supported by the compression spring 19 on the housing 2. The locking bolt. 3 stands thus under inwardly directed spring pressure due to the compression spring 19. The spring bearing pot with locking washers and the spacer tube 8 according to FIG. 1 is also omitted here. However, tubes for spring locking can be attached around the spring 19. · '■ -' be ordered.

The way in which the door lock works is described below for the "locked under spring force" embodiment with reference to FIG Circuit according to Fig. 5 explained. In contrast, FIG. 5a shows the change in the current path 52 for the embodiment: "Locked under current". The security door 42 has a locking opening 43 into which the locking bolt 3 protrudes, which passes through the retracted magnet armature 7 of the lifting magnet 6 can be unlocked. The locking bolt is locked, i.e. extended 3 by an internally and externally guided compression spring 5, which fully retains its function in the event of a spring break, since it is cannot slide into each other.

The limit switch on the first switch 20 is actuated via the plunger 16, which is through an inclined surface 44 or a Cam on the protective door 42 is switchable.

If the supply voltage is switched on with the protective door 42 open, shown in dashed lines, the lifting magnet 6 pulls the switch 45 and the "lock" button 46,

As a result, the switch 21 comes as a second limit button, the is mechanically coupled to the solenoid 6, in the "protective door open" position, with the opener 47 open and

the closer 48 are closed. Due to the inclined surface 44 on the protective door 42, the switch 20 is still operated as a multiple limit switch and first limit switch, the break contact 49 being open and the make contact 50 being closed, a relay 51 picks up via the make contacts 48, 50 and via \ its Normally open contact 61 the normally closed contact 62 goes into self-control.

and switch 54 closes.

The protective door is now closed so that the opener 49 of the switch Σ0 over the inclined surface 44 and the plunger 16 is closed and the closer 50 opens.

When the "Lock" button 46 is actuated, the current path 52 interrupted to the lifting magnet 6 and the magnet 6 * falls off. By means of the compression spring 5, the locking bolt 3 is pressed into the locking opening 43 and the switch 21 is switched over, so that the opener 47 is closed and the closer 48 is open. A relay 53 is now activated via break contacts 47 and 49 and a make contact 54. Through this the break contact 62 is opened and thus the relay 51 is de-energized and drops out. By closing the closer 60 remains the relay 53 attracted when the contact 54 opens. If the protective door 42 is locked, the current path 55 for the Release of the dangerous movement energized. Of the Opener 56 and closer 57 are closed.

If the supply voltage fails at this point, the protective door remains locked and the relay 53 drops out. The fact that the relay 53 in the event of a failure of the supply voltage drops, the current path to release 55 is interrupted by its normally open contact 57 and by its normally closed contact 45 the current path 52 of the lifting magnet 6 is switched through. At the

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Switching the voltage back on is thus the pantyhose 55 interrupted for release while the protective door 42 is unlocked. Is the dangerous one in the event of a power failure Machine still in motion, which is simulated by switch 58 used as a standstill monitor, remains the protective door is locked when the voltage is switched on again until the dangerous movement ends became. The protective door is then automatically unlocked, whereby the release of the movement is interrupted after the power failure remain.

During normal operation with the safety door locked, when the machine has come to a standstill, the Switch 58 thus indicates standstill, the protective door can be unlocked by pressing the "Unlock" button 59.

By opening the break contact 47, the relay 53 * is de-energized and thus the make contact 57 in the current path 55 of the release opened. In order to be able to lock the protective door again, it must first be opened so that the switch 20 actuated and thus the relay 51 is activated (normally open contacts 48 and 50 closed). This guarantees that if the switch 20 or 21 fails, the dangerous movement cannot be released.

The door lock comes with every line break, with every power failure and with failure of the limit switch in a safe state. You can either with one Failure cannot be locked, and thus the current path for release remains de-energized or, if there is a failure in the locked Condition occurs, it cannot be unlocked as long as the dangerous movement continues.

In the event of a security-endangering ferry So the following occurs

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a) In the event of a power failure with the protective door open, the Locking bolt 3 due to the force of the compression spring

5 in the "locked" position, the protective door cannot be locked. The relays 51 and 53 have dropped out,

- * The current path 55 to enable the dangerous movement remains interrupted, even when switching on again * If voltage is again present, the lifting magnet pulls

6 so that switch 21 * is also the normally open contact 48 closed and the relay 51 picks up, so that the starting position is restored.

b) In the event of a power failure with the safety door locked, the The release for the movement is canceled by the relay 53 dropping out. The protective door 42 remains locked. the Locking is only activated when the machine comes to a standstill and

i- "switch the voltage canceled. A relock and the dangerous movement can only be released after opening and closing the safety door.

c) In the event of a cable break in the +24 volt supply line, the "enable" 55 current path cannot be switched through, or the release is canceled, since the relay 53 is de-energized in any case. If the cable breaks - 0 volts Return line, the lifting magnet 6 is de-energized. It cannot be unlocked or * not when the protective door is open be locked.

² ^ In the event of a cable break in the control line from normally open contact 48, 50 to relay 51, the protective door 42 can be locked if the relay 51 is latched. Thereafter, locking with a release is no longer possible, since the relays 53 and 51 have dropped out. In the event of a cable break in the line from NC contacts 47, 49 to relay 53, the release is immediately canceled or it is not issued.

The protective door remains locked. If the cable breaks Line from the "Unlock" button 59 to the lifting magnet ö the protective door remains locked *

d) If the mechanism fails, the limit switch 21, the of the mechanics of the magnet 6 and the plunger 7 not actuated * This prevents the locking of the door 42 and releasing the dangerous Movement.

e) A break in the locking spring acts as a Safety spring is inserted, not disturbing.

f) A defect in the solenoid 6 that is responsible for a 100% duty cycle is designed, only leads to release when the protective door is closed. When open The protective door is not released because switch 20 is actuated.

¹ I RHEiNMETAN, .ι ■ ·. .. ·· .. ··,

% *** "'" NeUSS ₄ November 8th, 1982

Sv / Sch

File EL 95 reference corpses list

1 lid

2 housings

3 locking bolts

4 shaped washer 5 compression spring

6 solenoid

7 magnet armature - (bolt)

8 spacer tube

9 bracket

10 lock washer

11 lock washer

12 guide bush

13 bolts

14 compression spring 15th plate

16 plunger on the switch

17 plunger on switch 20 and

18 sleeve

19 compression spring

20 first switch

20a additional switch

21 second switch

22 piece of food

23 compression spring

24 cylinder screw

25 threaded screw

26 Terminal Strip

27 fixing screw

28 Carrier plate 29 assembly square

-

: ■ 'f

30 spring bearing cup |

31 Seal |

32 connection hole f

33 pin hole " 34 spacer tube

35 rubber seal '■

36 threaded nut L

37 screw I

38 disc | 39 screw I

40 lock washer |

41 Lock washer I

42 protective door f

43 Locking opening I 44 Inclined surface \

45 Relay contact to coil 53 (NC contact), I

46 Button: Lock |

47 NC contact of switch 21 |

48 normally open contact of switch 21! 49 break contact of switch 20 f

50 normally open contact of switch 20 I.

51 relay coil |

52 rung |

53 Relay coil $ 54 Relay contact to relay coil 51 (make contact) | "

55 current path I

56 Relay contact to relay coil 51 (NC contact) f

57 Relay contact to coil 53 (make contact) 1

58 Standstill monitor '59 Button: Unlock ' ■

60 Relay contact to coil 54 (closer)!

61 Relay contact to coil 51 (closes?) - ';

62 Relay contact to coil 54 (NC contact)

hm im

Claims (10)

RHEINMETALL GMBH Neuss, November 8th, 1982 Sv / Sch file EL 95 * = - claims 1. Safety door lock to protect against dangerous movements on a manufacturing device, in particular a processing machine, in which the protective door, possibly designed as a protective grille, is locked during the dangerous movement with the help of limit position sensors and an electromechanical locking device, or the dangerous movement during the Opening and inevitably switched off in the open state of the protective door, characterized in that both limit position sensors and the lifting magnet of the electromechanical locking device are combined in a housing (2) to form a structural unit _; that the first limit position sensor is a safety limit taster as a plunger (16) on a switch (20) with a spring force directed towards the door with inevitable contact opening via a cam ^ an inclined surface (44) or the like of the 'füi * (42 ) is movable, and that in a locking opening (43) on the door (42) can be introduced, below the door - '9- _ * 1 11 » I t • 1 « '* * »T * Ii t <« 4l <«« it ■ ··· * ■ a I t «« ftf «« · · · 1 or the locking bolts (3) of the electromechanical locking device that are located away from the door by spring force with the second limit position sensor alB indirectly more effective, the position of the solenoid (6) of the locking (9)
device scanning bracket is mechanically coupled as a limit switch to a second switch (21) with inevitable contact opening. 2. Lock according to claim I _1, characterized in that in a housing (2) with the connection dimensions of a conventional switch housing, for. B. according to DIN 43697, approximately in the middle of the solenoid (6) and on opposite sides thereof one of the switches (20, 21) with limit switches is housed. 3. Lock according to claim 1 or 2, characterized marked that the one with his free End of the switch plunger (17) of the second switch (21) actuating bracket (9) with the locking bolt (3) A movable unit via the movable magnet armature (7) of the lifting magnet (6) with the locking bolt (3) forms. 4. Lock according to one of claims 1 to 3, characterized in that the connection of the ttagaetanker (7) with the locking boltäii (3) via a spacer tube (8) supported by a spacer tube (8) Compression spring (5) under an outwardly directed spring force spring bearing pot (30) and one outside on the spring bearing cup (3Ö), on the inside of the locking plunger (3), a fixed shaped washer (4) is formed, and the magnet armature (7) when current passes through the solenoid in Riöhtuno is displaceable on the bracket (9). Ii * * * t $ 4 (I. I 14 4 »III * i * 4 * I IMI Il I «I · · I I I I II · I I «ill III II "" ill llltl "II II" t I t> III "II 5. Lock 'according to one of claims 1 to 3, da = characterized in that the connection of the Macjnetanker (7) with its free End rests against the free end of the locking bolt inside the housing, with the locking bolt (3) is formed by a fixed on the locking bolt shaped washer (4), which is supported by a on the housing (2) Compression spring (19) is held under inwardly directed spring force and the magnet armature (7) at iÖ current passage through the solenoid can be moved in the direction of the locking bolt (3). (Fig. 3) 6. Lock according to one of claims 1 to 5, characterized in that the second switch (21) with such a distance between bracket (9) and switch plunger (17) is arranged that the switch plunger (17) through the bracket (9) only briefly before the locking position of the locking bolt (3) in the locking opening (43) in its switching position is slidable (in which the normally closed contact 47 of the second switch 21 is open). 7. Lock according to one of claims 1 to 6, characterized in that the Compression spring (5, 14, 19) is designed as a safety spring in such a way that the spring is around on its inside a pipe, ζ. B. the spring bearing pot (30) around, is guided against this and on its outside in a pipe, ζ. B. the spacer tube (8), wherein the spring is designed and / or arranged that when installed, the distances between adjacent turns of the spring are smaller than the Diameter of the spring wire. 8. Lock according to one of claims 1 to 7, characterized in that the Compression springs (5, 19) are designed so that they do not I j j · «I I I I ■ il i ♦ · * it ι H in till ·! · till · ι 1 JI _- I Μ _ I 'I ■ · only return spring for the locking bolt (3), but also return spring for the magnet armature (7) are, 9. Lock according to one of claims 1 to 8, d adurch characterized in that the fastening screws (27) for the magnet armature (6) on the housing (2) at the same time the mounting bracket (29) for the second switch (21) and a carrier plate (28) Fasten with spacer tube (34) for the electrical connection terminal strip (26). 10. Lock according to one of claims 1 to 9, characterized in that the The locking bolt (3) and the actuating plunger (16) are each sealed on the outside by a sealing bellows (35) are.