ACCESS DOOR ARRANGEMENT OF AN ELEVATOR SHAFT

Abstract

An access door arrangement of an elevator shaft, wherein at least one elevator car is moving, includes a door lock, whereby in connection with the door lock a reset switch of an inspection mode resetting device is located, whereby the door lock has a lock part movable between a lock position and an open position and whereby the reset switch is integrated in said door lock to be operated by the movement of the movable lock part or a related movable part. This solution allows an easy resetting of the inspection mode of the elevator.

Claims

1. A pit access door arrangement of an elevator shaft wherein at least one elevator car is moving, the pit access door arrangement comprising a manually operated door lock, whereby in connection with the door lock a reset switch of an inspection mode resetting device is located, whereby the door lock has a lock part movable between a lock position and an open position and whereby the reset switch is integrated in said door lock to be operated by the movement of the movable lock part or a related movable part.

2. The arrangement according to claim 1, wherein the door lock of the emergency unlocking device includes a triangle key connected to the lock part.

3. The arrangement according to claim 1, wherein the lock part counter-acts with a sliding surface located in connection with a structure surrounding the access door, which sliding surface extends at least partly along the way of the lock part between its lock position and open position, whereby the switch is located in connection with the sliding surface.

4. The arrangement according to claim 3, wherein the sliding surface is covered by a cover element.

5. The arrangement according to claim 1, wherein the switch is fixed to the access door and is operated by an operating part connected to the lock part.

6. The arrangement according to claim 5, wherein switch comprises a pivoted lever which is actuated by the operating part of the lock part on its way between the open and lock position.

7. The arrangement according to claim 1, wherein in connection with the switch a second switch is located which issues a signal for a safety space arrangement for a reduced shaft pit/shaft top.

8. The arrangement according to claim 1, wherein the movement of the lock part into its lock position is prevented by a blocking mechanism as long as the access door is not closed.

9. The arrangement according to claim 1, wherein the door lock comprises a door contact, and the elevator control is configured to consider the signal of the reset switch dependent on the status of the door contact.

10. The arrangement according to claim 1, wherein the access door is a landing door of the elevator or an inspection hatch in the bottom of the elevator shaft.

11. The arrangement according to claim 1, wherein the arrangement comprises an elevator control which is configured to decode a sequence of lock/opening moves of the lock latch into a reset signal for the inspection mode of the elevator.

12. An elevator comprising the arrangement according to claim 1.

13. A method for resetting elevator control from inspection mode to normal operation mode, which method comprises the steps of: during inspection mode, turning an inspection switch in a pit inspection station from an inspection position to normal operation position; exiting the pit and closing a pit access door having a door lock connected with a reset switch for the inspection mode of the elevator; after closing the access door, operating manually the door lock in a given moving sequence to cause the reset switch to change its status according to the moving sequence of the door lock; reading the switching state of the reset switch; and turning the elevator from inspection mode to normal operation mode when the status of the reset switch changes according to the moving sequence.

14. The method according to claim 13, wherein the moving sequence is the movement of the door lock from lock position to open position within a given time period, causing the reset switch to change from a first status to a second status.

15. The method according to claim 14, wherein the moving sequence is the movement of the door lock from lock position to open position and back to lock position within a given time period, causing the reset switch to change from a first status to a second status and further back to the first status.

16. The method according to claim 13, wherein a door contact of the access door is observed on its open or closed status and the reset of the elevator into normal operation mode is allowed only when at the end of the moving sequence the door contact is in closed status.

17. The method according to claim 14, wherein the elevator is reset from inspection mode to normal operation mode when additionally the door contact changes, preferably together with the reset switch from a closed status to open status and back to closed status.

18. The method according to claim 13, wherein the reset of the inspection mode is only possible after any mechanical stopping device in the elevator shaft has been moved into its idle position for normal operation mode.

19. The arrangement according to claim 2, wherein the lock part counter-acts with a sliding surface located in connection with a structure surrounding the access door, which sliding surface extends at least partly along the way of the lock part between its lock position and open position, whereby the switch is located in connection with the sliding surface.

20. The arrangement according to claim 2, wherein the switch is fixed to the access door and is operated by an operating part connected to the lock part.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The invention is hereinafter described by the aid of the schematic drawings in connection with embodiments of the invention.

[0040] FIG. 1 shows a view on an inspection hatch of an elevator,

[0041] FIG. 2 shows a detail of the door lock of the access hatch from FIG. 4,

[0042] FIG. 3 shows a side view III of FIG. 2 and

[0043] FIG. 4 shows a door lock with a lock latch being provided with a double switch.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0044] FIG. 1 shows an inspection hatch arrangement 10 wherein the access door to the elevator shaft is an inspection hatch 12, pivoted at an elevator shaft wall structure 14. The inspection hatch 12 has a door lock 16 which comprises a turnable lock latch 18 connected with a triangle key part 20 on the inspection hatch side and on the elevator shaft wall side a sliding surface 22 with a stopper 24 which defines the lock position 26 of the lock latch which is shown in FIG. 2 with dotted lines. The open position 25 of the lock latch is marked with a vertical dotted line.

[0045] FIG. 2 shows in continuous lines the open position of the lock latch 18 wherein it extends vertically from its pivot axis 28. In the sliding surface 22, a pivoted switch element 30 of a reset switch extends from the sliding surface 22 as a ramp. When the lock latch 18 turns from its open position 25 into its lock position 26, it pushes the switch element 30 down which triggers the reset switch of the inspection mode resetting device which turns the elevator back to normal operation mode.

[0046] FIG. 4 shows a second embodiment 40 of a door lock arrangement which is in this case an emergency unlocking device of a landing door, having a basis part 42 mounted to the access door or access hatch of the elevator shaft which basis part 42 carries via a support element 43 a double switch 44 with a reset switch 46 being part of the inspection mode resetting device and a second switch 48 being part of a safety space device regarding the operation of components in the elevator shaft to ensure a safety space when the dimensions of the shaft top or shaft pit are not sufficient to meet the international regulations. The emergency unlocking device 40 has a pivoted lock latch 50 which comprises a lock portion 52 extending perpendicular to the pivot axis 54 of the lock latch 50. This lock portion 52 grips behind a sliding surface as it is e.g. shown in FIGS. 2 and 3. Connected to the movable lock latch 50 is an operating part 56 co-acting with pivoted operating levers 58 of both switches 46, 48. Via this means, both switches 46, 48 are operated when the lock latch 50 is moved via the triangle key (FIG. 1) from its open position into its lock position.

[0047] The invention is not limited to the described embodiments but may be varied within the scope of the appended patent claims.

LIST OF REFERENCE NUMBERS

[0048] 10 inspection hatch arrangement [0049] 12 inspection hatch [0050] 14 elevator shaft wall structure [0051] 16 door lock [0052] 18 lock latch [0053] 20 triangle key part [0054] 22 sliding surface [0055] 24 stopper [0056] 25 open position [0057] 26 lock position [0058] 28 pivot axis [0059] 30 pivoted switch element [0060] 40 door lock arrangement [0061] 42 basis part [0062] 43 support element [0063] 44 double switch [0064] 46 reset switch [0065] 48 second switch [0066] 50 lock latch [0067] 52 lock portion [0068] 54 pivot axis [0069] 56 operating part [0070] 58 operating levers of the switches