US1117361A - Speed control for motors. - Google Patents

Description

I s. K. EVANS. SPEED CONTROL FOR MOTORS. APPLIGATION FILED NOV.8, 1913. 1 1 1 7, 3 1, Patented Nov. 17, 1914.

2 SHEETS-SHEET 1.

S. K. EVANS. SPEED CONTROL FOR MOTORS.

APPLICATION FILED NOV. 8, 1913.

Patented Nov. 17, 1914.

2 SHEETS-SHEET 2.

sanronn KEITH EVANS, or museum), NEW Yonx.

SPEED conrnon' r03 MOTORS.

Specification of Letters Patent.

Patented Nov. 17, 1914.

Application filed November 8, 1913 Serial N e. ?9B,862.

To all whom it may concern:

Be it known that I, SANFORD KEITH Evens, a. citizen of the United States, residing in Elmsford, county of Westchester,

and State of New York, have invented a new and useful Improvement in Speed Controls for Motors, of which the following is a specification.

My invention relates particularly to speed controls for motor cars-in which an electric contact, adjustable in the path of a contact moving with the index of a speedometer, is arranged through an electric controlling circuit automatically to stop the motor when the car reaches the speed at which the adjustable contact is set, a key-operated lock being provided to lock the said contactin any adjustment, so that it cannot be displaced except by the possessor of the proper key.

In a prior application for patent filed by me August 16, 1912, Serial No. 715,340, I have described and claimed broadly a lock for the adjustable contact, comprising a lock member in the form of teeth adjustable with the contact, a lock member in the form of a rack, movable into and out of engagement with the adjustable lock member, a series of stops in the shape of teeth on the rack to engage said lock members together in any position, and a key, illustrated as acting through an ordinary lock, to secure said lock membersin engagement and to release them. *In another and allowed application for patent filed by me March 26, 1913, Serial No. 756,901, I have shown a rotary member and gearing for adjusting a sliding contact, the contact lock consisting of the rotary member itself as the adjustable lock member, the movable lock member being in the form of a tumbler or tumblers in the rotary member. These tumblers engage a series of stops, in the form of teeth, on afixed memher or case in which the rotary member turns, and the key not only engages the rotary member to release the tumblers from the stops, but also serves as a handle for turning the rotary member and thereby adjusting the contact. In my present applicamember and connecting gearing for adjusting the adjustable contact, and a key-operated lock comprising a series of stops, for locking the rotary member and contact in -any position. But I employ and claim also tion I use also and claim broadly a rotaryimproved forms of adjustable and speedmoving contacts, and improved means for adjusting and locking the adjustable contact, as hereinafter set forth. Q Reference is to be had to the accompanymg drawings forming part of this speci hcatlon in which like parts are designated by the. same numbers in all the figures.

F gure 1 is a cross sectional view on the line 1-1, Fig. 2, of a speedometer of a wellknown type provided with a speed control embodying my present invention. Fig. 2 is a rearsectional View of the same on the line 2 -2, Fig. 1. Fig. 3 is a face view of the same partly broken away. Fig. 4 is a rear sectional view on the line 4.4, Fig. 1.

The drawings represent my invention applied to a speedometer of the well-known Hoffecker or steady hand type, 5 designating the case of the speedometer, 6 the flexible driving shaft, 7 the governor, 8 the governorsoperated lever which swings on the fixed shaft 9, and through the connections shown (which need no description here) moves the index 10 over the scale of miles 11 so as to indicate the speed of the car. i

l2 and 13 designate the speedrmoving and adjustable contacts respectively, which by their meeting close the electric-controlling circuit a-nd stop the motor, as described in my aforesaid prior applications. To give more power to the moving contact 12, I, in this case. fix it on the swinging lever 8, so that it will swing in harmony with the speed index 10, and I mount the adjustable contact 13-011 one arm 14 of a lever 15 which is likewise pivoted to swing on the fixed shaft 9, so that the contact 13 will swing in its adjustment in the path of the moving contact 12. :Conveniently to adjust the contact 13, l

here form the adjusting lever 15 with another arm 18, on the end of which is a follower l7 operated by a snail cam 18 against the tension of a spring 24. The cam 18 is fixed on the rear end of an adjusting cylinder or member 19, which is mounted to revolve around a cvlindrical member 20, the forward end of which is here shown fixed to a downward extension 21 of the speedometer .case 5. On the forward end of the rotary member 19 is a milled rim 22 for turning it by hand and thereby setting the adjustable contact 13, and also a circular scale 23 of miles corresponding to the speed scale 11 of 2 threat the speedometer, the numbers of said scale 23 being arranged to show singly through an aperture index 25 in the case extension 21.

The arrangement and adjustment is such that when the rotary member 19 is turned to show any number, as 20, at the index 25, the contact 13. adjusted thereby through the intermediate gearing described will be met by the swinging contact 12 when the speed of the car reaches 20 miles per hour, and the motor will be thereby automatically stopped by the closing of the controlling circuit, as described in my said" prior apphcations.

For locking and releasing the adjustable contact 13 in any position by the appropriate key 26, I here employ a lock whose movable lock member is in the form of a spring-projected pin tumbler 27, working axially in the fixed member 20, and adapted to engage one of a series of pin-holes, serving as stops, 28, disposed in a circle in and around the rear end of the rotary member 19. To operate said loclr l mount revolubly in the fixed member 20, a cylindrical barrel .32, having an axial key-slot 29 adapted to be engaged by the appropriate key26, and on its rear end-a cam 30 to engage and retract a follower 31 on the pin tumbler 27, so that when the key 26 is inserted in the slot and turned, the pin tumbler 27 will be retracted by the cam 30 from the corresponding pin-hole stop 28. The rotary member can then be turned to set the adjustable contact and control at any desired speed as indicated at the aperture 25, and the adjustable conta ".t and control then looked in that position by turning the barrel 32 by the key until the pin tumbler 27 is released and enters the corresponding pin-hole stop 28, and withdrawing the key.

Having thus set forth the nature of my invention and in what manner-the same is to be performed, I claim as new and desire to secure by LettersPatent:

1. The combination, with the rotary, contact adjusting'member, and the fixed me ber relative. to which the rotary member turns, of a lock consisting cfa movable locl r member and a series-of stops to engage said rotary member and fixed member-together in any relative position, a barrel mounted to turn in the fixed member, a key to engage and turn said barrel, and means operated by said key barrel to operate said lock.

2. The combination, with the rotary contact-adjusting member and the fixed member relative to which the rotary member turns, of a barrel to turn in the fixed member, a key to enga e and turn said barrel, a series of stops, an a movable lock member to engage said 'rnovableand fixed member togather in any relative position, a cam operated by the key-barrel and a cam follower to free the movable lock member from the stops, substantially as described.

The combination, with a speedometer, a contactv moving with speedometer inden, and an electric circuit-controlling contact adjustable along the path oisaid move; 5

ing contact, of a rotary member havin: numbers corresponding to the speedometer scale, a fixed member on which the rotary member turns, an index on the fixed member, and gearing betweenthe rotary member and the adjustable contact, the adjustment being such that when the said index points to any number on said rotary member, the mov ng contact will meet the adjustableeontacttat that speed. i. lhe combination, with a speedometer, a contact moving with the speedometer in den, and an electric circuit-controlling contact adjustable along the path of said moving contact, of a rotary contact adjusting member, a contact adjusting cam moved by said rotary member, and a contact adjusting lever having a follower actuated by said cam. 5. The combination, with a speedometer and its lever swinging with the speedometer index, of a contact swinging-with said lever, a contact adjustable in the path of said swinging contact, a levercarrying said ad just-able contact, and mounted to swing on the axis of the swinging contact lever, and 95 means for adjusting. and locking said contact. carrying lever.

SAN

In presence of Cnas, H. Swarm-ram, .Creanncn li lB'oirem,

KEITH ,E Q A

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