No title available

• US 3,592,296 A
• Filed:
• Issued:
• Est. Priority Date: 03/30/1970
• Status: Expired due to Term

• Current Assignee: Schindler Elevator Corporation (Schindler Holding AG)
• Original Assignee: Schindler Elevator Corporation (Schindler Holding AG)
• Time in Patent Office: Days
• US Class Current: 187/284
• CPC Class Codes: B66B 1/52 Floor selectors

Abstract

Coincidence of true elevator car position with floor selector indicated car position is monitored at each stop of the car. A lack of coincidence disables the control by the floor selector and causes it to institute hunting until it establishes coincidence with true elevator car position. Upon achieving coincidence hunting is stopped and its control reestablished.

Claims

1. A control for an elevator car operating along a hatchway and serving terminal floors and a plurality of floors intermediate said terminal floors comprising a notching type floor selector;

means to notch said floor selector in response to travel of said car along said hatchway to given positions;

means responsive to said floor selector to indicate an effective car position along said hatchway;

means to indicate the actual car position along said hatchway;

means responsive subsequent to operation of said notch means for a given car position spaced from said terminal floors along said hatchway for sensing an out-of-step relationship between said actual car position and said indicated car position; and

means to notch said selector in response to said out-of-step relationship whereby said selector indicated car position is brought into step with said actual car position.

2. A control according to claim 1 wherein said means to indicate actual car position comprises a plurality of circuit elements having a first circuit controlling condition and a second circuit controlling condition;

means to mount said circuit elements on said car;

means to transfer said circuit elements from said first to said second condition when in a given spatial relationship to said elements; and

mounting means for said transfer means for mounting said transfer means in said hatchway in actuating relationship to certain unique combinations of said circuit elements for each indicated car position;

3. A control according to claim 1 including means to stop said car level with landings for a plurality of said intermediate floors;

and means to actuate said sensing means while said car is stopped level with said intermediate floors.

4. A control according to claim 3 wherein said means to notch said selector in response to an out-of-step relationship sensed by said sensing means is effective for a limited time interval.

5. A control according to claim 4 wherein a timer is initiated by a given condition while said car is topped and defines a given interval within which said notching means responsive to an out-of-step relationship is effective.

6. A control according to claim 1 including a circuit commutated by said floor selector;

and means to disable said commutated circuit while said selector is notched in response to said out-of-step relationship sensed by said sensing means.

7. A control according to claim 1 including a circuit commutated by said floor selector and means to disable said commutated circuit while said sensing means senses said out-of-step relationship.

8. A control according to claim 1 wherein said means for sensing the out-of-step relationship between the actual car position and the floor selector indicated car position senses the relative magnitudes of said positions and issues a signal characteristic of said relationship.

9. A control according to claim 8 wherein said means to notch said selector in response to the out-of-step relationship includes directional control means responsive to said relative magnitude Signal whereby said notching is in a direction initially tending to reduce said magnitude.

10. A control for an elevator car operating along a hatchway and serving a plurality of floors comprising a notching type floor selector;

means to notch said floor selector in response to travel of said car along said hatchway to given positions;

means responsive to said floor selector to indicate an effective car position;

means to indicate an actual car position along said hatchway;

means responsive subsequent to operation of said notch means for a given car position for sensing an out-of-step relationship between said actual car position and said indicated car position;

a circuit commutated by said floor selector; and

means responsive to said sensing means for disabling said circuit while said out-of-step relationship between said car and said floor selector persists.