US939357A - Magneto-electric machine for ignition purposes. - Google Patents

Description

C. A. VANDERVELL & P. I. HOFFMAN. MAGNBTO ELECTBIO'MAGHINE FOR IGNITION PURPOSES.

APPLIOATION' FILED SEPT. 25, 1908; 939,357.

Patented Nov. 9, 1909.

2 SHEETS-SHEET 1.

G. A. VANDERVELL &'P. I. HOFFMAN. MAGNB'I'O ELECTRIC MACHINE FOR IGNITION PURPOSES.

APPLICATION FILED SEPT: 25, 1908.

Patented Nov. 9, 1909.

SHEETS-$113M 2.

Fig 2.

UNITED s A'rEs rAT NT orrron.

CHARLES ANTHONY VANIDERVELL AND FREDERICK ISIDORE HOFFMAN, OF LONDON, ENGLAND.

MAGNETO-ELECTRIO MACHINE FOR IGNITION PURPOSES.

' Specification of Letters Patent.

Application filedseptembel 25, 1908. Serial NO. 454,809.

To all whom it may concern:

Be it known that we, CHARLES ANTHONY VANDERVELL, subject of the King of Great Britain and Ireland, and FREDERICK Ismonn HOFFMAN, subject of the Emperor of Ans tria-Hungary, both residing at London,

England, have invented new and useful Improvements in and Relating to Magneto- Electric Machines for Ignition Purposes, of which the following is a specification.

This invention relates to magneto-electric machines" particularly ofthe so-called high tension type for igniting the combustible mixture of high speed internal combustion engines and has for its object the direct driving by the magneto-electric machine of the current distributor without the intervention of any ratio gearing and the provision of simple means for igniting the charge in any number of cylinders without any change in the driving mechanism of the magnetoelectric machine.

The usual form ofmagneto-machine has a double poled H armature giving two sparks per revolution; and as multicylinde'r' motors require the sparking to take place at certain intervals in relation to the angle of the cranks some form of gearing is adopted for driving a distributor from the magnetomachine. This invariably takes the form of a pinion on the armature spindle gearing into a wheel of double the size on the distributer for use with a 2 or 4 cylinder motor.

For motors having a different number of cylinders a difi'erentdriving gear of another ratio value has to be used.

By this invention we can obtain one spark external periphery of which we arrange an endless path such as a groove or a rib or equivalent device, but the ath is two, three or more times around the circumference. In

, the case of twice around, the path would cross itself once and in the case of thricearound, it would cross itself twice. In conjunction with the path we arrange a movable device or shuttle adapted to follow the path. The cylinder may be substantially of insulating material and be provided with rubbing contacts at the proper position in the path and the movable device or shuttle will contact with these contacts as it travels along the path. It is obvious the endless path may be formed on the surface of a revolving disk or its equivalent and will produce the same effect as the cylindrical arrangement. v I

In order that our invention may be the better understood we will now proceed to describe the same in relation to the accompanying drawings, reference being had to the letters and figures marked thereon.

Like characters refer to like parts in the various figures.

Figure 1 is an end elevation of a magnetomachine with our distributer fitted thereto, the end .cover being removed to show the interior of the distributer box. Fig. 2 is a side sectional elevation on the line A-B of Fig. 1. Figs. 3 and at are sectional views of the distributor box. two views of the shuttle or movable contact device. By reference to the drawings it will be seen that a known construction of magnetoelectric machine for four cylinders is illustrated to which our invention has been applied whereby' the 2 to 1 gear is avoided and the distributer is driven directly by the armature shaft.

a represents the permanent magnets, 12 the condenser, c the low tension make and break device, and d the armature with high and low tension winding.

Upon the right hand end of the frame.

of the machine e'distributer box f of insulating material is mounted having four separate metal contacts 6 e e and 6 arranged in grooves z and is which cross and join one another at the point 3'. These grooves form Patented Nov. 9,1909.

Figs: 5 and 6 area series of annular paths, and a connecting path. The contacts 6 6 c and e are connected by conductors f, f f and f to sockets into which connecting plugs g g, g

and g are inserted for connecting the sparking plugs to the distributer. On the'end of the armature shaft is fixed a device 9 consisting of a body of insulating material in which is disposed a metal casing r, having a tubular extension 8 in which a spring pressed carbon brush. Z is adapted to slide plunger 1) spring ressed' by a spring 0 an carrying a fie'x'ib e metallic tongue n having at its end the shuttle m.v

It will be seen that every two revolutions 4 contacts e e a .e are made successively by the shuttle m following the ath of the convolutions i and is running. rst in one groove and then in the other. 7

Itis obvious that if the make and break device is done away with and the armature has only one primary winding this arrangement can be used for distributing the low tension generated current as well.

What we claim as our invention, and desire to secure by Letters Patent is 1 In a magneto-e1ectric machine having a movable element a current distributer consisting of a device having a series of paths joined up as one continuous path, a series of contact pieces disposed in the said paths,

a shuttle adapted to co-act with the said paths and constituting a contact piece which In the device g is slid- 2. In a magneto-electric machine, a current distributer comprising a box of insulatin material, having a series of paths 'joine up as one continuous path, contact pieces arranged in .said paths, an armature,

a shuttle carried by the armature, said shuttle constituting a contact piece connected to armature, and 'means for permittin the shuttle to travel in the continuous pat and make contact with the contact pieces arranged therein.

In witness whereof we have hereunto set our hands in presence of two witnesses.

CHARLES ANTHONY VANDERVELL. FREDERICK ISIDORE HOFFMAN.

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