Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS1152433 A
Publication typeGrant
Publication dateSep 7, 1915
Filing dateAug 5, 1914
Priority dateAug 5, 1914
Publication numberUS 1152433 A, US 1152433A, US-A-1152433, US1152433 A, US1152433A
InventorsThomas J Murphy
Original AssigneeThomas J Murphy
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1152433 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)



APPLICATION man AuG.5'.19|4.

Patented-Sept. 7, 1915.



To all whom t may concern Be it known that I, THOMAS J. MURPHY, a subject of the King of Great Britain, and a resident of Rochester, in the county of Monroe and State of New York, have invented a certain new and useful Time-Switch; and l do hereby declare the following to be a full, clear, and exact description of the invention,`V such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification..

y invention relates to time switches, and it particularly is applicable to an electric motor startenfor anv automobile engine.

It has for-is object to provide a switch which may be closed for a short interval of time and at the expiration of the interval will be automatically opened by the continuation of the closing movement'or pressure of the switch.

The invention may be contained in many forms of constructions usable for different purposes all of which come within the pur view of my claims hereafter appended. To Show the practicability of my invention l have selected one of such constructions as an example and shall describe it hereinafter.

he construction selected is illustrated in the accompanying drawings.

Figure l illustrates a vertical sectional view of the particular switch selected. Fig.

2 is a view of a contact plate shown also in' Fig. 1. Fi 3 is a transverse Section Showing the bu erpiston for regulating the in- `terval in which the piston is closed.

l, Fig. l, is'an actuating member which may be of any form. As shown in the illustration it is a short rod having in its end sockets 2 and 3. lt may extend 'through a door l of an automobile and be actuated by a pedal 5 having the hub or spindle G which is secured in the socket 2 in the upper end of the rod l by means ofthe pin 7. The switch may be operated by the operator pressing his foot upon the pedal 5..

The lower end of the rod l is secured to a housing l0 movable in a shell 1l, by means of a pin l2. The upper end of a rod 13 is slida'bly movable in the housing 10 and the eocket 3 located in the lower end of the rod Specification of Letters Patent.

Patented Sept. 7, 1915.

Application mea august 5, 1914. serial No. 855,341.

1. A disk 14 is secured by the rod 13 by means of a pin 15. A spring 16 is located intermediate the upper end of the housing and the disk 14. rl"he spring 16 tends to keep the disk 14 at the lower end of the housing and elastically holds the rod 13 down to the farthermost point, depending upon the location of the 13 is connected to a detent for temporarily holding it. so that the contacts will be held closed for a short time. The detent is in the form of a buer having a piston 20.

A valve disk 21 is supported on movable pins 22 below the piston 20 and is adapted to seat on the circular ridge 23 located on the bottom of the piston 20.. The piston 20 1s also provided with openings 241 which are closed by thel disk 21. This forms a clap valve which resists the downward movement of the piston 20, but allows a free upward movement of the piston. rlhe piston 2O is located in a cylinder 30 forming a part of the lower end of the shell 11. lThe piston moves in a contracted portion 31 of the cylinder 30 and detains the piston 20. The part 3 2 of the cylinder below the contracted portion is enlarged so as to permitthe buffer material such as air,

oil, or glycerin, to pass freely around the periphery of the piston when the piston is moved into said lower part 32. The two parts of the shell 11 are secured together by the bolts 55.

A contact plate 410 is supported by means of pins Lil below the lower end of the housing l0., so as to permit vertical movements of the contact ei0 relative ,to the housingJ lG. rlhe plate and the pins 41-1 are elastically held away from the lower end or" the housing 1G by the springs d2. A coacting Contact plate is secured to the rod 13 by means of the hubbed disk t, and the pin 45. contacts l0 and d3 are suitably insulated from the other parte othe'switch. Each contact is connected through the insulated wires i6 and binding ternal circuit .an inverted thinible is located on and depends from the top of the cylinder 30, and is shouldered the upper end of the cylinder. A. spring 51 hai/*ing lighter resisting pressure than the spring i6 is located between the lower end of the thimble 50 and the Llei. rlihe spring 5l presses upon the disk 14 on the rod 13. The rod.

posts 4J? with by the pedal 5 the contacts 40 and 43 imme' diately close, the rod 13 being held up by the piston as the valve disk 21 is immediately closed. The spring 16 is compressed and tends to drive the rod 13 and the iston 20 downward. The valve disk 21 eing closed the fluid seeps by the piston 20 very.

slowly and consequently allows the piston 2O to descend very slowly. Meantime the external circuit 48 through the binding post 47 is closed. When the .piston 20 reaches the enlarged portion 32 where the Huid will freely pass around the periphery of the piston, the spring 16 will snap or throw the piston 20 to the bottom of thecylinder consequently separating the contacts 40 and 43, thereby breaking the external circuit by the operaf be heldfaway from the contact 40 notwith standing the fact that the pedal 5 may be" held down by the foot of the operator, the` movement of the pedal being limited by the 'pin 41.2. When the pedal is` released the spring rod 13 and the piston 20. The valve disk 21 thereby being removed from its seat 23,

51 operates to lift the housing 10, the

l the piston 20 and the other parts freely move upward. The piston 20 again enters the contracted portion 31 of the cylinder 30 and when, the pedal 5' is again pressed downward between the contacts 40 and 43 and the s ring 16 being compressed operates to s owly force the piston 20 vdown the conupon rod 13 is released and the circuit is opened, When the spring 16 has been compressed by movement of the pedal 5 a short distance it will continue to move the piston 20 notwithstanding the fact that there is no further downward movementof the pedal by the foot. Under ,such conditions the spring 16. continues to operate the rod 13 and piston 20 after the foot has moved the pedal but a short distancel by reason of the fact that the piston acting as a buffer delays the operation of the spring 16 consequently, if time `is given for the operation of the spring 16, the rod will continue to be moved by the spring-16. c

The pins 41 and the springs 42 may be so constructed as to slightly tilt the upper con tact 40 so that when the circuit is broken there will be a slight shearing movement of the contacts relative to each other and break any welding that might occur by reason of the increased current formed in the breaking of the circuit.`

tracted portion 31 of the cylinder 30 where- The construction selected and described may be greatly varied 1n the arrangement and manufacture of its parts and in the sub- T,

stitution of elements having Aequivalent func- '4 tions and suchmodifications may be used for many varied purposes and still contain the invention.

What I claim as,v new and desire to secureA in the housing, a spring for actuating the rod in one direction relative to the housing, a second contact secured to the rod, a releasable buffer secured to the rod and a second spring for returning the housing, contacts and therod to their normal positions.

2. The combination of a pair of contacts, a member for closing the contacts, one of the contacts secured to the member, la yielding member connecting the first member to the other contact and meansfor regulating the time interval in which the contacts are closed. tion of the spring` 16. The contact 43 will 3. The combination of a pair of contacts, a' closing member for closing the contacts, a spring connecting the closing member with one of the contacts,v closing operation of the closing member for permitting the said spring to open the'contacts. Y

4. The combination of a pair of contacts, a closing member for closing the contacts, a spring connected between the contacts for separating the contacts and a detent for temporarily holding the contacts in closed relation. the valve disk'21 is closed, contact is made 5. The combination of' a pair of contacts, a closing member for closing the contacts, a spring locatedintermediate the contacts for opening the contacts' and a sprin for returning the contacts to their norma positions and a detent for permitting the contacts vto be temporarily retained in their closed positions.

6. The combination of a air of'contacts, a closing member, a spring ocated intermediate the contacts, one of the contacts connected to the closing member, the other contact connected to the spring and a buffer connected to one of the contacts for holding the contacts closed. against the opening operation of the spring.

7. The combination of a pair of contacts, a member for closing the contacts, one of the contacts connected to the member, a yielding means located intermediate the contacts, a buifer connected to the other of the contacts for holding the contacts closed against the operation. of the yielding means, a second yielding means for returning he contacts to their normal positions.

8. The-combination of a pair of contacts, a member for closing the contacts, one o the contacts connected to the member, a

a detent released in the i 31,152,433 yielding means iocefeol` inermeiate the oonaots, a buer connected to the other of the signed my name to this specication in the contacts foi' holding the contacts closed presence of two subscribing Witnesses.

against the operation of the yielding means, THUMAS J. MURPHY. a yielding means for returning the buier, Witnesses:

`the dosing member and the contacts to igheir ROBERT B. COCHRAN, normal positions. EDWARD MILLER.

n testimony whereof, I' ha-Ve hereunto

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2689363 *Oct 8, 1948Sep 21, 1954Charles F FryeAutomatic stop and timer for machine tool control
US3035521 *Jun 30, 1955May 22, 1962Stewart Warner CorpHydraulically timed electrical switch
US3226605 *Apr 5, 1962Dec 28, 1965Roberts Controls CompanySolenoid damping mechanism
US4342884 *Jun 11, 1979Aug 3, 1982Itsuki BanPiston unit
U.S. Classification200/34
Cooperative ClassificationH01H43/28