US1195128A - Safety control system eob elevators - Google Patents

Description

J. C. A. ANDERSON.

SAFETY CONTROL SYSTEM FOR ELEVATORS.

APPLICATION mu) JULY 11, 1914.

1,1 95,1 28. Patented Aug. 15, 1916.

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JOHN C. A. ANDERSON, OF CHICAGO,

ILLINOIS.

SAFETY CONTROL SYSTEM FOR, ELEVATORS.

Application filed July 11, 1914.

To all whom it may concern:

Be it known that I, JOHN C. A. ANDER- soN, a citizen of the United States, residing at Chicago, in the county of Cook and Stat of Illinois, have invented a certain new and useful Improvement in Safety Control Systems for Elevators, of which the following is a full, clear, concise, and exact description, reference being had to the accompanys ing drawings, forming a part of this specification.

My invention relates to safety control systems for elevators and more particularly is an improvement over my co-pending application Serial No. 802,8d3, filed November 24, 1913.

My invention contemplates the provision of a system of control so that the operating devices within an elevator car are suitably controlled by the doors leading to the hatchway.

In the preferred form of my invention when applied for instance to a lever controlled operating device, the controlling means take the form of apparatus of such a nature that whenever a door is open the operating lever is restored to its neutral position and suitably held there, but preferably held in such a way that by the use of extraordinary force the lever may be operated in an emergency should such be necessary. Of course, the control system can however be of such a nature that no operation of the lever can take place when a door is open, as will readily be apparent from the structure which will presently be described in detail.

My invention herein contemplates a preferred form of control structure of such a nature that the neutral position of the operating lever may be changed and accommodated for o as to allow for leaking valves or other imperfect apparatus. In the operation of hydraulic elevators, for instance, it may be found that the valves leak and that it is not immediately possible to overcome the difliculty. Under such conditions the operator is required to hold the control lever in a position slightly removed from its normal neutral position in order to keep the car at a standstill. The control devices aforesaid which are under the control of the door must therefore be arranged to accommodate for this change so that the lever is held in that position when the car remains at a standstill whenever the door is open.

Specification of Letters Patent.

the floor 1.

Patented Aug. 15, 1916.

Serial No. 850,428.

In the preferred form of my invention, I provide suitable adjusting devices in connection with the control mechanism by reason of which I am enabled to effect adjustment. It will of course be understood that operating devices other than a lever would fall within the scope of the term lever as applied throughout this specification, and claims.

I will describe one form which my invention may take more in detail by referring to the accompanying drawing illustrating the same, in which Figure 1 is a diagrammatic view of a sys; tem constructed in accordance with my invention; and Fig. 2 shows the parts in an alternative position somewhat enlarged.

Referring more particularly to Fig. 1, I show diagrammatically a floor 1 of an elevator car, in which car there is suitably provided a starting lever 2 adapted to control a cable 3, which cable of course extends to the starting and stopping devices for controlling the movement of the car. The lever 2 in this specific form is provided with an extending stud 4 carrying the two arms 5 and 6. These arms at their extremities are each provided with holes 7 adapted to carry bolts 8, connected to suitable tension elements or chains 9 and 10 respectively. These chains 9 and 10 are linked to the plunger 11 associated with the solenoid 12. This solenoid is preferably mounted within a suitable magnetic framework 13 and may desirably be attached to the underside of The attachment is preferably done by means of bolts 13 passing through slots 13, which slots are larger than the bolt so that the entire electromagnetic device may be adjusted longitudinally for purposes which will appear presently. The arrangement of the chains is such that whenever the solenoid is attracted to the full position shown in Fig. 1, that then these chains are taut and hold the arms 5 and 6 in such a position as would be occupied by them when the lever 2 assumes its neutral posit-ion.

Now whenever the lever 2 is actuated in either a clockwise or contraclockwise direction, then one of the chains is taut and the rotate the lever 2 into its central or neutral position as shown in Fig. 1. Now the solenoid 12 receives its current from any suitable source of supply, here shown as a generator 14:, and the circuit through the generator and solenoid 12 is controlled through the agency of suitable instrumentalities bridged to extending conductors 15 and 16. These conductors extend into proximity to each one of the doors 17, 18 and 19, it being of course desired that each door which permits access to the car he also provided with controlling devices to prevent operation of the car should the particular door be open. Each door may be provided with a projection 20 adapted to control circuit through springs 21 and 22. Normally when this projection is away from the springs as shown in the case of the door 17, then the circuit through the springs 21 and 22 is closed, thus closing the circuit across the conductors 15 and 16, thereby completing circuit through the solenoid 11, whereby to attract its core 11 and draw the hand lever 2 into its neutral position should the handle at that particular time be away from that particular position.

Now whenever the doors are closed as shown in the case of the doors 18 and 19, then the circuit through their springs 21 and 22 remains open and the solenoid 12 remains unenergized. It will thus be seen that the solenoid always restores the handle 2 into its central position whenever any door is open, and thus would tend to hold it in that position, thus to prevent manipulation of the cable or movement of the car during the time any such door is open. The bolts 8 are preferably attached to socket members 23 which are seated in circular recesses 2st provided in the opposite extremities of the arms 5 and 6. Nuts 25 are provided so that the length of each chain element 9 or 10 can be adjusted to suit the requirements. For instance, if a valve as before stated is leaking, in the operation of a hydraulic elevator, then the lever 2 must be held to one side of the center to keep the car at a standstill. The control devices can be adjusted to accommodate for this by adjusting the nuts 25 and by lengthening or shortening one or the other of the chains 9 and 10 and shortening or lengthening the other chain accordingly. Thus whenever the door is open the lever would be held in that position which would prevent movement of the car. The solenoid itself together with the framework 13 is adjustable to accommodate for the necessary distances, as already stated. The elevator is thus prevented from creepin Then again it may be that the lever must be held to one side of the center It may be under such conditions that it is desirable to have a little play in the chains when the solenoid is fully attracted so as to screws 29 and inserting washers or distance pieces between the rim 30 of this core portion 27 and its abutting portion of the frame work 13. A bleeder port 31 is provided through the core portion27 so that there will be no confined air. between this core portion and the plunger 11. From this it will be noted that the control devices can be adjusted to accommodate for these difierences as they occur inthe operation of elevators. Itis of the utmost importance that this change of the control system be made as otherwise such a control system might tend to hold the operating lever in a position when the car is continually creeping.

From what has been described the nature of my invention will be readily clear to those skilled in the art, and

What I therefore claim as new and desire to secure by Letters Patent is:

l. A system of the character described comprising-an elevator car, a control lever, a door for permitting access to said car, an electromagnetic device having a. core and tension members controlled by' said door when in an open position to restore or hold said lever in its neutral position, a. stop to limit the movement of said core, and means to adjust said tension members to change the neutral position of thelever to thereby prevent creeping of the carwhereby said lever is permitted a lost motion movement due to theadjustment of said tension members and thestop for said core. 7

2. A system of the character described comprising an elevator car, a control lever; a door for permitting access to said car, an electromagnetic device having a core and pivoted tension members controlled by said door when in an open position to restore or hold said lever in its neutral position, a stop to limit the movement of said core, and means to ad ust said tension member to change the neutral position of the lever to 7 thereby prevent creeping of the car, whereby said lever is permitted a, lost motion movement due to the adjustment of said tension members and the stop forsaidcore. 3. A system of the character described comprising an elevator car, a control lever, adoor for permitting access tosaid car, an electromagnetic device having a core and flexible tension members controlled by said door when in an open position to restore or hold said lever in its neutral position, a stop to limit the movement of said core, and.

means to adjust said tension members to change the neutral position or" the lever to thereby lrevent creeping of the car, Whereby said lever is permitted a lost motion movement due to the adjustment of said tension members and the stop for said core.

4. A system of the character described comprising an elevator car, a control lever, a door for permitting access to said car, an electromagnetic device having flexible tension members controlled by said door when in an open position to restore or hold said lever in its neut 'al position, and means to adjust said tension members to change the neutral position of the lever to thereby prevent creeping of the car, said means inciuding a tension member support, a. socket therefor, and means to adjust the relation of said tension members with their cooperating support.

5. A system of the character described comprising an elevator car, a control lever, a door for permitting access to said car, an electromagnetic device having flexible ten sion members controlled by said door when in an open position to restore or hold said lever in its neutral position, and means to adjust said tension members to change the neutral position of the lever to thereby prevent creeping of the car, said means including a tension member support, a socket therefor, and means to adjust the relation of said tension members With their cooperating support, said device including a solenoid, a plunger, a fixed core for said solenoid, and an insulating stop for said plunger mounted on said fixed core.

6. A system of the character described comprising an elevator car, a control lover, a door for permitting access to said car, an electromagnetic device having flexible tension members controlled by said door when in an open position to restore or hold said lever in its neutral position, and means to adjust said tension members to change the neutral position of the lever to thereby prevent creeping ot the car, said means including a tension member support, a socket therefor, means to adjust the relation of said tension members with their coi5perating support, and an adjustable mounting for said fixed core.

in Witness whereof, I hereunto subscribe my name this 27th day of June A. ll, 191%.

JOHN C. A. ANDERSON. i Vitnesses HAZEL ANN JONES, MAX JV. ZABEL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Eatents, Washington, D. G.

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