US1989524A

US1989524A - Delay switch

Info

Publication number: US1989524A
Application number: US732462A
Authority: US
Inventors: Frank L Moore
Original assignee: Individual
Current assignee: Individual
Priority date: 1934-06-26
Filing date: 1934-06-26
Publication date: 1935-01-29
Anticipated expiration: 1952-01-29

Description

Patented Jam 29, 1935 V UN ITED STATES,

issosu nmr swn-cn L: Moore, ChathmN-J. manna am :0, 1934, Serial No. 132,40:

Claims. (01. 115-315) This application is a continuation in part of my two prior applications for patents Serial No.

540,287, filed May 2'1, 1931, and Serial'No. 616,450 filed June 10, 1932, allowed June 23, 1933.

My present invention relatesalso to electric .de', lay switches for controlling the operation of electric elevators and other electrically controlled appliances, in which a predetermined time is alof the controlled apficiency of the delay switch. To attain these ob- :Iects in the present embodiment of my invention, I provide a partial primary appliance-operating circuit, of a power insufiicient by itself to operate the appliance, but sufilcient to reduce the force, and shock of the full operating current on the appliance and a secondary controlling and partial operating circuit including a solenoid or equivalent electric motor, and a main control switch, the arrangement being that when the main 'control switch is closed, the solenoid will be energized and first close the primary partial appliance-operating circuit; after a delay the solenoid will close the secondary partial appliance-operating circuit, which will in conjunction with the partial primary operating circuit operate the controlled appliance; on then opening the main control switch the solenoid will be de-energized, the secondary partial operating circuit will be opened and after a delay the primary partial operating circuit will be opened, the operation of the appliance arrested, and the parts restored to theiroriginal position ready for the next operation of the appliance.

In order that my invention may be fully understood I shall first describe in detail the mode in which its present embodiment is carried into effect, and then point out the various features 45 of the invention in the claims.

Reference is to'be had to the accompanying drawing forming part of this application in which corresponding parts are designated by the same 50 numbers in all the figures.

lowed between'the closing of the main control Figure 1 is a sectional elevation partly diagrams!" matic, illustrating a delay switch embodying my adjusting the period of delay in the operation of the appliance.

In the drawing, 10 designates the source of current; 16 the controlled apparatus in this example an electric motor for moving an elevator to be operated thereby; 13, 25, 46, 43, the primary partial operating circuit leading from, current source through the. controlled apparatus; 14, a switch in said circuit; 11, 15, 39, 51, 21, a control circuit leading from the current source to the terminal 24; 12 a main control switch in said control circuit; 52, 53, atwo-way switch in said controlcircuit; 40, 42, 43, a secondary partial operating circuit leading from the contact 53 of the two-

way switch

52, 53 through the con- 15 trolled apparatus;20, a solenoid fixed on the frame of the apparatus inthe control circuit 11,

15, 39, 51, 21, 24; 33, a piston-rod extending, through the solenoid and fixed immovably at its lower end to a bracket fixed to the frame of the apparatus; 32, a piston fixed on the upper end of the piston rod 33; 31, a non-magnetic cylinder fittedto work vertically on the piston 32. The piston is fitted loosely in thecylinder 3l, so that the air under pressure can pass slowly by the piston as the cylinder moves vertically'therein. The cylinder 31 is fixed on a plunger 27, fittedto move vertically and freely in the solenoid 21,-the upper section of the plunger 27 being non-magnetic and its lower section iron so that so it will be attracted and the plunger and cylinder pulled upward by the solenoid 20 when energized.

In both the upper and lower ends of the cylinder 31, are provided short by-passes 49, so that the cylinder will be freed of the air pressure produced by its motion on the fixed loosely fitting piston, as the fixed piston is approached by either end of the cylinder.

0n the lower end of the plunger 27 is fixed a pin or projection 26 which is arranged, when the plunger reaches the end of its downward motion, to contact the spring contact of the switch 14 and break the primary

partial operating circuit

13, 25, 46, 43. v

On the cylinder 31, fixed on the plunger 2'1, is fixed a vertically adjustable projection 54, shown in detail in Figure 3, which, when the plunger reaches the upper end of its motion, is arranged to strike the double contact arm 51, of the

twoway switch

52, 53, and move the double contact from the fixed contact 52 to the fixed contact 53.

The operation of' this vention is as follows:

When it is desired to operate the controlled appliance 16, after a delay which is predetermined by a proper vertical adjustment of the two-way switch-operating projection 54, the main control switch 12 is closed.

The current will then flow from the source 10, through the

control circuit

15, 39, 21, 24, and the solenoid 20 therein, energizing the solenoid, liiting the plunger 27, with its lower projection 26, and thus freeing and closing the normally open switch 14. The primary partial operating current will then fiow from the source 10 through the circuit, 13, 25,46 and 43 through the controlled appliance 16. This primary operating circuit is provided with a suitable resistance- 47 so that the primary operating current will not have power enough alone to start and operate the appliance, but will greatly reduce the shock on the appliance when the secondary operating current is applied thereto after the predetermined delay as hereinafter described.

The plunger will then continue to rise slowly, owing to the upward pull of the solenoid, the rise of the plunger being slowed by the pressure 01' the air in the cylinder below the pistons escaping slowly past its periphery.

when the lower end of the rising cylinder 31,

reaches the piston 32, the air is released by the lower by-pass 49. At the same time, the adjustable projection 54 on the cylinder 31, strikes the two-way switch arm 51, and moves the double contact therein from the lower fixed contact 52, to the upper fixed contact 53, thus breaking the control circuit 15, '39-, 21, 24, and closing the secondary

partial operating circuit

15, 39, 40, 42, 43, through the appliance 16.

This secondary operating current will then reinforce the primary operating current already exerting its force on the appliance and operate the appliance without shock.

when the operation of the appliance is completed, the main control switch 12 is opened. The secondary

partial operating circuit

15, 39, 40, 42, 43, will then be broken, and the force on the appliance thus reduced to that extent. I

The solenoid in said circuit will at the same time be de-energized, and the plunger being freed of air pressure by the lower cylinder by-pass 49, will be retarded and fall slowly against the pressure .of the air above said by-pass, until it reaches its lower position. It will then be again freed of air pressure by the'upper cylinder bypass 49, for the next 'operation. At the same time, the lower projection 29 on the plunger, will open the primary operating switch 14, and finally break the

primary operatingcircuit

13, 25, 46, 43, thus arresting the operation of the appliance without shock and after the delay desired.

It is evident that many modifications of this embodiment of my invention may be made without departing from the boundaries of my invention.

I claim as my invention:

1. Means for operating an electrically controlled appliance aiter a delay comprising a main control circuit including a main control switch and solenoid, a. cylinder and piston and means for causing the cylinder to be moved by the solenoid slowly relatively to the piston against the resistance of the air partially confined in the cylinder, a primary partial operating circuit including a switch, means for operating the primary partial operating switch by the initial relative movement of the cylinder and piston, a secondary partial operating circuit including a switch, and means for operating the secondary partial operating switch by the delayed relative movement of the cylinder and piston so that after a delay the secondary operating circuit will combine with the primary operating circuit to operate the appliance without shock, and when the main control switch is opened, the secondary operating circuit will be de-energized and after a delay the primary operating circuit will be deenergized and the operation 01 the appliance discontinued.

2. Means for operating an electrically controlled appliance after a delay in accord with claim 1, in which the switch in the secondary partial operating circuit is a two-way'switch included also in the main control circuit, and is operated by the delayed relative movement or the cylinderand piston, to switch the current from the main control circuit to the secondary partial operating circuit.

3. Means for operating an electrically controlled appliance after a delay in accord with claim 1, in which the solenoid and piston are fixed and the cylinder is fixed on a plunger moving vertically in the solenoid, the lower part or the plunger being magnetic and the upper part non-magnetic.

4. Means for operating an electrically controlled appliance aiter a delay in accord with claim 1, in which the solenoid and piston are fixed and the cylinder is movable and carries a projection which operates the switch in the primary partial operating circuit.

5. Means for operating an electrically controlled appliance after a delay in accord with claim 1, in which the solenoid and piston are fixed and the cylinder is movable and carries a projection which operates the switch in the sec-' ondary partial operating circuit.

6. Means for operating an electrically controlled appliance aiter a delay in accord with claim 1, in which the solenoid and piston are fixed and the cylinder is movable, the piston being loosely fitted within the cylinder to permit the air to pass slowly by the periphery of the piston and the cylinder being provided with bypasses at each end to. i'ree the piston of air pressure at each end 01' the movement of the cylinder thereon.

' L. MOORE.