US1603302A - Timer - Google Patents

Description

Oct. 19 1926. 1,603,302

A. J. WOODFORD I TIMER Filed July 9, 1924 6 g WW Patented Oct. 19, 1926.

UNITED STATES PATENT OFFICE.

ARTHUR J. WOODFORD, OF NAMPA, IDAHO.

TIMER.

Application filed July 9,

This invention relates to improvements in gas engine timers and the primary object of the invention is to provide a novel timer particularly adapted for use with the Ford engine.

Another object of the invention is to provide a timer having a rotary cam disk to take the place of the brush used in the ordinary timers. This cam disk is adapted to move a contact disk, to break the circuit instead of completing the latter, which is the reverseof the usual timers.

A further object is to furnish a timer including a thrust ball bearing adapted to roll between the smooth surfaces of the rotary cam disk and contact disk; the contactdisk being yieldingly pressed against this thrust hearing by a light spring, so that friction is reduced to a minimum.

Another object is to provide a structure in which the contact disk is intermittently moved oil" of the heads of the contact screws in a straight line and does not slip over nor rub the heads of the screws in a manner similar to the ordinary 'timer, Consequently there is no friction or wear on the contact screws or points. This absence of friction prevents the formation of scale on the contact points and thus obviates the possibility of a short circuit.

A still further object is to furnish a timer of durable and inexpensive construction.

\Vith the foregoing objects outlined and withother objects in view which will appear as the description proceeds, the invention consists in the novel features hereinafter described in detail, illustrated in the accompanying drawing and more particularly pointed out in the appended claims.

Referring to the drawing:

Fig. 1 is a front view of a portion of an engine with my improved timer attached thereto.

Fig. 2 is an enlarged longitudinal sectional view of the improved timer.

Fig. 3 is a sectional view taken on line 3-3 of Fig. 2.

Fig. 4 is a detail sectional view on line 4-4 of Fig. 2.

Fig. 5 is a side view of a thimble forming part of the construction. I

Fig. 6 is a top plan view of the thimble.

Fi 7 is a side view of the cam disk, whicfi may be attached to the ordinary cam 1924. Serial No. 725,007.

shaft, in place of the ordinary timer brush, or be attached to an auxiliary cam shaft.

In the drawing 1 designates an ordinary Ford engine having the usual front plate 2 through which the cam shaft 3 projects. This plate also has the ordinary forwardly projecting annular flange 4 which engages the usual timer casing. For the purpose of the present invention, the brush which is usually arranged on the front end of the cam shaft is removed, and a bevel gear 5 is fixed in its place by a nut 6 or the like.

The improved timer may be used with a lower casing 7 having a cylindrical edge 8 adapted to fit into the flange 1 and this casing well as the parts to which it is connected are held in place by the usual bolt 9, which ordinarily holds a timer casing on the plate 2 in position. integral with an upwardly extending post 10 having bearings 11 and 12 in which the shaft 13 is rotatably mounted. A bevel gear 1 1 is fixed on the lower end of the shaft and nies'l'ies with the gear 5, the post 10 is enlarged as at 15, and has an upwardly extending annular flange 16. This flange 16 and the head 15 form a shallow oil cup, which as shown in Fig. 4 is provided with a depression 17 which communicates with a port 18 that leads the oil from the cup into the bearing 11.

The shaft 13 is reduced at 19 to provide an annular groove which receives asplit ring or washer 20. Resting on this washer, is the cam dis; 21 which has a centrally disposed sleeve 22 fitting on the upper end of the shaft 13, and the cam disk is secured in position by a nut 23 screwed on the upper end of the shaft. Due to this construction, the cam disk 21 rotates in unison with the cam shaft 3.

Arranged above the cam disk 21, is a thrust bearing disk 24 functioning as a cage for balls 25 which roll on the upper surface of the cam disk.

The flange 16. receives the lower edge of an ordinary timer shell 26 which is provided in the usual manner with a plurality of contact points or screws 27 Arranged within the shell and resting upon the balls 25, is a contact disk 28 which, as the cam plate 21 is rotated, is raised from and lowered towards the points 27 to break and make the circuit. he arrangement is such,

The lower casing is The head of.

LII

that the circuit is normally complete and is intern'iittently broken as the cam disk rotates. This is contrary to the usual procedure.

The disks 24: and 28 are centered within the shell and maintained in contact by a thimble 29, which has a should r 3t) resting on the disk 28. As shown in Fig. 2, the lower end of the thimble 30 extends through the ring 2%, holding the same to center; and disk 28 held to center by the inside of timer shell 26. The thimble No. 29 is held to center by disk :28.

The thimble has an angular aperture 31 in its head to receive the square shank 2-32 of a pin 33. This square shank also extends through a square hole in the head of the shell 26 and consequently prevents the thimble from rotating. A coil spring 3i surrounds the pin and bears against the shell 26 and thimble '29, to force the contact plate 28 against the points 27.

The head 15 has an upwardly CXtQlltllilf-Q' arm 35 carrying a spring arm 36 whch bears against the head of the pin 33 and holds the parts in position. The shell, 26 has the usual arm 37 connected to the rod 38 by which the operator controls the. position of the timer points 27.

It is obvious, if desired, that the parts 5, 6, 7, s, 10, 11, 12, 13, 14., 15, its, 1? and is may be omitted and the parts within the shell may be arranged at the front end of the shaft 3. In such a case the cam 21 will be mounted on shaft- 3 and casing 23 will be changes may be made in the details set forth without departing from the spirit of the invention as expressed in the claims.

What I claim and desire to secure by Letters-Patent is:

1. In a timer, a rotatable shaft, a shell associated wth said shaft and provided with relatively fixed spaced contact points, a contact disk norn'lally engaging one of said points, means driven by the shaft for raising the disk out of contact with said points, a thimble bearing against said disk, a pin connecting the shell and thimble and fixed against rotation. and a spring surrounding the pin for forcing the contact disk toward said points.

2. A timer including a lower casing adapted to be connected to an engine, a post extending upwardly from said casing and having an enlarged head. a rotatable shaft carried by the post, a shell connected to said head, a cam disk fixed on the shaft and ar ranged within the shell, a .ball cage provided with balls resting on said disk, spaced contact points lixed in the shell, a contact disk arranged in the shell and normally bearing against one of said points and resting on said balls, a thimble extending into the contact disk and cage, a pin connecting the thimble to the shell and preventing the thimhle from rotating, and a spring surrounding the pin and hearing against said thiinble.

3. A timer including a. rotatable shaft, a disc fixed on said shaft and having an outer cam surface, a ball cage having balls resting on the cam surface of said disc, a shell enclosing said disc and including an annular wall having spaced internal contact points thereon, a contact disc arranged within the shell and normally resting upon one of said points and upon said balls, means for preventing said contact disc from rotating with said shaft, and resilient means for forcing the contact disc toward said points.

In testimony whereof I hereunto altix my signature.

ARTHUR J. WOODFORD.

Images