US2223088A

US2223088A - Electrical apparatus

Info

Publication number: US2223088A
Application number: US288053A
Authority: US
Inventors: Donald M Berges
Original assignee: Bendix Aviation Corp
Current assignee: Bendix Aviation Corp
Priority date: 1939-08-02
Filing date: 1939-08-02
Publication date: 1940-11-26
Anticipated expiration: 1957-11-26
Also published as: FR866549A; GB543000A

Description

D.- M. BERGES ELECTRICAL APPARATUS 7 Nov. 26, 1940.

Filed Aug. .2, 1959 INVENTOR 4 Do/m/d MBe/yes Patented Nov. 26, 1940 PATENT OFFICE ELECTRICAL APPARATUS Donald M. Berges, Alpine, N. J assignor to Bendix Aviation Corporation, South Bend, 11111., a

corporation of Delaware Application August 2, 1939, Serial No. 288,053

10'Glaims. (Cl. 123-479) This invention relates to electrical apparatus, and particularly to the control of current flow and electro-magnetic action.

An object is to provide unitary means for producing both electrical and mechanical energy fiowas, for example, the closing of an electric circuit and the coupling of mechanically rotatable members such as an engine crank-shaft and an engine-engaging gear or clutch for imparting in itial rotary movement to such crank-shaft."

It has heretofore been proposed to incorporate circuit controlling means with engine-engaging mechanical linkage, as a means of insuring flow of current to an ignition facilitating agency--- such as the induction coil 92, of Allen Patent No. 2,141,33lin synchronism with the movement of the engine-engaging member (of an engine starter) to engine-engaging position. When there is employed an ignition facilitating agency as such as that shown at 92 in the Allen patent above identified (and also shown in the accompanying drawing at 19) it is customary to provide a special terminal on the conventional high tension magneto-such as the terminal indicated 26 at H in the drawings of Hicks Patent No. 1,862,116 granted June 7, 'l932which terminal (as pointed out in the Hicks patentspecifica vice is employed in aircraft, the operation of the (,0 current controlling parts of the device is a cause 'of possible interference with the reception and transmission of radio signals; and an object of the present invention is to provide unitary circuit operating and work performing linkage in- 45 volving such construction and inter-relationship of parts as to assure perfect shielding of the auxiliary ignition circuit against radio interference.

Another object is to provide for electro-mag- 50 netic operation of a unitary circuit operating and work performing linkage of the character indicated. In this connection a feature ofv the invention is the ,use of a. single set of terminals for dual duty: first, for securing the ends of the magnet winding, and secondly, for anchorage of thecontact fingers constituting the normally separated elements of the switch controlling the flow of current to the ignition facilitating agency or other electrical unit to beenergized'concurrently with operation of the mechanical linkage above 5 referred to.

These and other objects of the invention will become apparent from inspection of the following specification when read with reference to the accompanying drawing wherein is illustrated the 10 preferred embodiment of the invention. It is to be expressly understood, however, that the drawing is for the purpose of illustration only, and is not designed asa definition of the limits of the invention, reference being had to the al pended claims forthis purpose.

In the drawing- Fig. 1 is a central sectional view of a device embodying the invention;

Fig. 2 is a sectional view of a portion of the as sembly of Fig. 1, showing the relationship of parts In the several views the reference numeral Ill engine engaging clutch element shiftable in one direction in response to energization of the winding M of the solenoid assembly contained within the shell [0; a clutch element of this character being indicated diagrammatically at IS in Fig. 3. 40

The plate H is provided with a central opening, and a guide member 25 is mounted with its outer end suitably fixed in said opening as'by means of the upset flange or lip indicated at 26.

The member 25 extends inwardly from the plate II and constitutes a fixed magnetic pole piece centrally located within the solenoid. A connecting member in the form of a rod 21 of nonmagnetic material is mounted to slide freely within pole piece .25, and is provided at one end with a movable core or plunger 30 of magnetic material and of slightly smaller diameter than the outside diameter of the fixed pole piece 25. The

. plunger is suitably secured to the connecting rod 21 as by means of a pin-48, and at its opposite '55 end is centrally bored and threaded to receive a screw 33 having a head 34 adapted to receive pivotally one end of a lever or bellcrank 35 having connection at its opposite end 36 with the device to be actuated such as, for example, the clutch shifting mechanism of the above identified Allen patent. Also as in said Allen patent a suitable spring or equivalent means (not shown) may be provided to maintain the plunger rod 21 in the position indicated in Fig. 1 until such time as I ceives the solenoid winding I4 as well as the terminal posts 38 and 46 which, as shown, are a molded in the head portion 31 of the spool 38. At its outer end the terminal post 39 receives a contact finger 6| whose curved end 62 is adapted to rest upon the cylindrical surface of a switch element 63 mounted upon and movable with the plunger rod 21 upon which it is adjustably secured by suitable means such as the

split rings

65 and 66; and'a similar contact finger 61 is mounted on the terminal post 40 and is also adapted to rest upon the switch element 63 but at a point thereon which lies in a plane that is axially spaced from the plane of contact of the finger 6|, so that in the normal position of the parts as shown in Fig. 1 the finger 6| rests upon the non-conducting portion 1| of the switch element 63 while finger 61 rests upon'themetallic and hence current conducting portion 12. When, however, the plunger rod 21 is shifted to its opposite extreme position as by the passage of current through the Winding I3 and the resulting closure of the air 'gap between the fixed and

movable pole pieces

25 and 36, respectively, the switch element 63 rides along between the fingers 6| and 61 until both said fingers make contact with axially separated but electrically united portions of the metallic sleeve 11 of the switch assembly (as shown in Fig.'2),,thereby completing a circuit from the source 18 (Fig. 3) to the ignition facilitating agency 19 by way of the switch contacts 80 (said switch having first been closed to energize winding l4), conductor 8|, the finger 6|, the sleeve 11, and the fin'ger 61.

To employ motor M (Fig. 3) as the accelerating means for flywheel F of the engine starter, the operator may utilize the same source of current as for the energization of solenoid winding l4, and the motor control switch contacts 86 'may be bridged by remotely disposed control, to per-I mit use of a short heavy cable from source 18' to said switch contacts 86, and the installation of said switch in proximity to the motor housing.. To this end there is provided a second solenoid 82 energizable to close switch 86, the flow of current to said solenoid being by way of normally open contacts 83, in shunt with contacts 86, and bridgeable by the same manually operable contact maker 84 as are the said contacts 66, although the said contact maker is normally disposed in an intermediate position 01 nonengagement' with either set 80 or the set 63.

Due to the above described connection to the magneto-distributor, the wire leading'from the auxiliary agency," necessarily enters the housing of the main magneto, and in consequence thereof it is a potential source of interference with the reception and transmission of radio signals by means of radio equipment in adjacent locations. As a means of minimizing such interference I provide features of the switch structure which in and of themselves constitute a practically perfect barrier to radio frequency oscillations, since the exposed conducting portion 12 of the switch element 63 is in contact with finger 61 and therefore serves to ground the induction,

coil side of the switch (by way of rod 21 and housing l3) during the entire period in which the switch remains in open circuit position. Thus the element 63 tends to eliminate any positive capacitance value across the said fingers 6| and 61, by providing a path to ground for any energy oscillations in the area intercepted thereby.

In Fig. 1 there is also shown a desirable form of readily detachable terminal connection for switch finger 61, involving a spring-pressed snap rivet '68 registering with a slot in the lower end of finger 61, and removable with insulating bushing 69 whenever retaining nut 10 for cable 13 is unthreaded from its mounting boss on housing section l2.

What I claim is:

1. In a device of the character indicated, the combination of a set'oi current conducting switch elements, means including an insulating element normally preventing current flow from one of said switch elements to the other, current conducting means integrated with said insulating element and serving to intercept energy waves emanating from said switch elements, and means for moving the intercepting means to a position of current conducting relationship with respect to both said switch elements.

2. In a device of the character indicated, the combination of a set of current conducting switch elements, and meansincluding a third current conducting member interposed between said switch elements and serving in one -position to facilitate current flow from one of said switch elements to the other, and in another position to intercept energy waves emanating from saidtive capacitance valve acrossthe said fingers.

3. In a device of the character indicated, the combination of a solenoid winding, a spool of insulating material to receive said winding, said spool having a pair of metallic terminal posts embedded therein, a current conducting switch element mounted on each of said terminal posts, and means including a third current conducting member interposed between said switch elements and serving in one position to facilitate current flow. from one of said switch elements to the other, and in another position to intercept energy waves emanating from said switch elements, and thereby eliminate any positive capacitance value across the said fingers.

4. In a device of the character indicated, the combination of a set 01' current conducting switch elements, means including a third current conducting member interposed between said switch elementsand serving in one position to facilitate current flow from Tine of said switch elements to the other, and in another position to intercept energy waves emanating from said switch elements, and thereby eliminate any positive capacitance value across thesaid fingers, and electromagnetic means for moving said thirdcurrent member from one of said positions to combination of .a solenoid winding, a spool of insulating material to receive said winding, said spool having a pair of metallic terminal posts embedded therein, a current conducting switch element mounted on each of said terminal posts, means including an insulating element normally preventing current flow from one of said switch elements to the other, and current conducting means integrated with said insulating element and serving to intercept energy waves emanating from said switch elements, thereby eliminating any positive capacitance value across said switch elements. a

6. In an electro-magnetic device for use with internal combustion engine starting mechanism or the like, the combination of a set of ignition facilitatingswitch elements, means including an insulating element normally preventing current flow from one of said switch elements -to the other, and common means including an electro magnet for simultaneously connecting the engine starting mechanism yvith the engine and removing said insulating element from current flow preventing position. I

7. In a device for use with internal combustion engine starting mechanism or the like, the com- 8. In a device for use with mechanically ro- I tated torque transmitting mechanism or the like, the combination of a set of current conducting switch elements, means including an insulating element normally preventing current flow from one of said switch elements to the other, .current conducting means integrated with said insulating element and serving to intercept energy waves emanating from said switch elements, and common means for simultaneously moving the torque transmitting mechanism to torque transmitting position and the intercepting means to a position of current conducting relationship with respect to'both said switch elements.

9. In a device of the character-indicated, the

combination of ,a solenoid winding, a spool of insulatingmaterial to receive said winding, said spool having a pair of metallic terminal posts embedded therein, a current conducting switch element mounted on each of said terminal posts, means including an insulating element normally preventing current now from one of said switch elements to the other, current conducting means 10. In a device of the character indicated, the

combination of a solenoid winding, a spool of insulating material to receive said winding said :spool having a pair of metallic terminalposts embedded therein, a-current conducting switch element mounted on each of said terminal posts,

means including a third current conducting .member interposed between said switch elements and serving in one positionto facilitate current flow from one of said switch elements to the other, and in another position to intercept en'- ergy waves emanating from said switch elements,

and thereby eliminate anypositive capacitance value across the said fingers,- and means including magnetic pole pieces operative upon the pas- ;sage of current through said solenoid winding to cause movement of said third current con-.- ducting member to a position of current conducting relationship with respect to both said switch elements.

DONALD M. BERGES.