US1340121A - Timeb - Google Patents

Description

W. W. SCHUBERT.

TIMER} APPLICATION FILED JUNE 11, 1919.

1,340,121. Patented May11,1920

gnvwfl'oz W.W. E1 chub art rm TED STATES PATENT OFFICE.

WILLIAM W. SCHUBERT, OF CHICAGO, ILLINOIS.

TIMER.

Specification of Letters fatent. Patented hiay 11, 1920.

Application filed June 11, 1919. Serial No. 303,382.

breaking the electrical current of the spark plugs in proper order. I

The principal objects of my invention are, first to provide a timer which is compact, readily assembled, or dismembered, per mitting of the replacing of worn parts with ease, and in general simplifying the construction and manufacture of the timer, permitting it to be vended at a comparatively low cost; second, to provide a timer in which the ring of insulating material carrying spaced contacts is held more accurately and securely in substantial axial alinement with the drive shaft of the rotor and permitting a person not necessarily skilled in the art to replace a worn ring or worn contacts without danger of excessive wear which might result where the cooperation of parts is such as to not permit accurate replacement of the contact carrying ring with respect to the rotor axis; third, to provide an improved rotor, the contact of which is permitted to more readily accomodate itself to the contour of the insulating ring and contacts which are normally stationary; and, fourth, to provide a rotor con tact and stationary contacts, in combination the latter being embedded in a ring of insulating material and the contacts so proportioned that the rotor contact in its successive movement over the contacts as well as over the ring will remain in continuous contact with the ring to prevent'chipping of the insulator and contacts.

Other objects and advantages of the invention will appear in the following detailed description, taken in connection with the accompanying drawing, forming a part of this specification; and in which drawing:

Figure 1 is a central vertical sectional View throu h a timer constructed according to my invention.

Fig. 2 is an elevation looking in the direction of the hollow of the housing.

Fig. 3 is an elevation viewed from the op- I posite side of the timer. 1

In the drawings, Where similar characters refer to similar parts throughout the views, A designates a housing which may be made of metal; B a stator contact assembly; C, means for securing assembly B in operative relation to housing A; D a drive shaft which may be driven in the usualmanner at a predetermined speed ratio, from the crank shaft of an engine, and E a rotor.

Referring first to the housing A, it is preferred to form the same of metal, with a hollow cylindrical portion 4 closed at one end by a wall 5 provided with arecess 6 at its exterior, axially alined with the axis of cylindrical portion 4:, this recess to receive the usual lug of the spring used to hold the housing in operative relation to the engine, said lug and spring not being shown in the drawing. In the preferred embodiment of the invention, the wall 5 is annular in shape and provided with a trunco-conical shell portion 7, the recess 6 being formed in the end portion of portion 7. For a purpose to be subsequently set forth, the inner face 8 of wall 5 is in a plane at right angles to the axis of cylindrical portion 4, and the wall is provided with a plurality of symmetrically disposed transverse ways 9, spaced a suitable distance from the shell portion 7 As to the stator contact assembly, it comprises a ring 10 of insulating material such as bone gray hardened fiber and is preferably of disk like shape with its faces 11 and 12 substantially parallel; a plurality of contact heads 13, and stems 14 extending therefrom. In the example shown, the contacts 13 are of elongated arcuate shape, and disposed in arcuate spaced-apart recesses 15, symmetrically about the axis of the ring and substantially flush with the face 11 of the ring. The stems 14: extend through ways 16 transversely of the ring, and open to recesses 15 and the opposite face 12 of the ring. When placing the assembly B into 17 extends into the ways 9 and have flanges 18 to overlie the exterior face of walls 5 as clearly shown in Fig. 1 of the drawings.

With the assembly B thus in place, it is to be observed that the face 12 is in surlace contact with the face 8 of wall 5, and it is preferred to machine the face 8 so that it is in a plane at a right angle to axis of cylindrical portion 4: and to shape the ring 10 so that the faces 11 and 12 are substantially parallel.

The means C may comprise nuts 19 in screw-threaded engagement with the stems l4, turned tight against the bushings 17, so as to draw the ring 10 with its face 12 in intimate contact with the face 8 of wall 5. Thumb nuts 20 may also be provided on stems 1 1 and thus the nuts 19 and 20, in combination with the stems 14 serve as binding posts for the usual electric conductors.

Referring to the rotor E it comprises a main body portion 21 including an arm 22 extending from sleeve like portions 23 disposed about the drive shaft D and rotatable therewith as through pin 2%; a truncoconical shell 25, with its base rigid with main body portion 21, and its hollow 26 confronting the assembly B; a cylindrical hollow contact 27 provided with a wall 28 for engagement with the ring 10 and con tacts 13, the contact 27 telescoping shell as by engaging over the tapering portion of the shell as clearly shown in Fig. 1 of the drawing, and an expansion spring 29 in the hollows of shell 25 and contact 2'7, said spring urging the contact 27 into intimate contact with the ring 10 and contacts 13.

t is preferred to make contacts 28 of a diameter greater than the width of contacts 13, as clearly shown in Figs. 1 and 2 of the drawing, so that as the rotor moves, this contact will, at all times, slide 011 some portion of the hardened fiber ring 10 and at both sides of the contact 13 as contact 27 is passed thereover so that it will not wear away the fiber or contact in such a way as to meet with an abutment at the end portion of the contact as might result where the rotor contact is relatively smaller than the width or" the stator contacts.

The housing A, in the example shown is provided with a suitable operating arm 30, the function of which is well understood by those skilled in the art. 7

Changes in details may be made without departing from the spirit or scope of my invention; but,

I claim:

In a timer, the combination with a plurality of contacts in spaced insulated relation about a common axis, of a rotor around said axis comprising a main body portion, a trunco-conical shell portion with its base rigid with the main body portion and its hollow shell portion confronting said contacts, a cylindrical hollow contact provided with a wall for engagement with said first mentioned contacts and telescoping said shell of said rotor, and an expansion spring in the hollows of said trunc'o-conical shell and said cylindrical contact ur ing the latter into engagement with said contacts one at a time as the rotor is moved.

WILLIAM W. SCHUBERT.

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