US2205189A

US2205189A - Signaling apparatus

Info

Publication number: US2205189A
Application number: US269330A
Authority: US
Inventors: Robert S Edwards
Original assignee: Edwards and Co Inc
Current assignee: Edwards and Co Inc
Priority date: 1939-04-22
Filing date: 1939-04-22
Publication date: 1940-06-18
Anticipated expiration: 1957-06-18

Description

June 1940. R. s. EDWARDS 2,205,189

SIGNALING APPARATUS Filed April 22, 1939 42 62 6 43 57 .33 25 263 325 I 324' m 5 a P I a 29 i 28 //Z F 26 INVENTOR 1905527 5. [PA A205 T RNEY Patented June 18, 1940 UNITED STATES PATENT OFFICE I amass SIGNALING APPARATUS Robert S. Edwards, New Canaan, Conn, assignor to Edwards and Company, Inc., Norwaik, Conn., a corporation of New York 1 Application April 22, 1939, Serial No. 269,330

20 Claims. (CL 177-7) This invention relates to signaling apparatus, particularly signaling apparatus, electrically actuated, of the audible type.

One of the objects of this invention is to pro- 5 vide a practical and inexpensive signaling construction that will be strong and durable, compact and of dependable action. Another object is to provide an electrically actuated gong construction that will be inexpensive to manufacture, capable of ready and inexpensive assembly,

fool-proof in construction and action and compact in arrangement. Another object is to provide an electricallyactuated gong construction that will be easy to install and well adapted to use in installations, such as on vehicles, where it is subjected to vibration. Another object is to provide in an electric gong construction subunits or sub-assemblies capable of rapid and convenient assembly one with another to build up the signaling apparatus. Another object is to provide an electrically actuated signaling mechanism of the above-mentioned character in which electrical connection is achieved in a simple, inexpensive and durable manner. Another object is to provide a multi-tone audible signaling apparatus that will be of simple construction, compact, and characterized by simplicity and dependability of assembly in manufacture and action in practical use. Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements. and arrangements of parts as will be exemplified "n the structure to be hereinafter described and the scope of the application of which will be indicated in the following claims.

In the accompanying drawing in which is shown one of the various possible embodiments of this invention;

Figure 1 is a central vertical sectional view through the assembled apparatus;

Figure 2 is a plan view as seen from the the top in Figure 1, certain parts being broken away;

Figure 3 is an end elevation, partly in section,

as seen along the line 3-8 of Figure 1;

Figure 4 is a detached perspective view of a casing part and bracket showing their interrelation in assembly, certain parts being broken away or omitted, and

Figure 5 is a detached perspective view of a part of the electromagnetic actuating means.

Similar reference characters refer to similar parts throughout the several views of the drawing.

Q5 Referring first to Figures 1 and 2, let it be assumed that it is desired to provide an audible signaling apparatus, illustratively of the bell or song type, and that it is to be capable of sounding two different notes or tones; accordingly, I provide two gongs l0 and H of which gong I0 is 5 the larger and has the loweror deeper note when set into vibration and accordingly the two gongs are proportioned so that the one is receivable within the other and is well accommodated therein, illustrative proportions of these two parts 1Q being as shown in Figures 1 and 2. These two gongs are mounted or secured together, preferably coaxially, and where the. inner gong is of less depth along its axis than the outer or larger gong, I may provide suitable 1 5 spacing means, such as a collar or washer II, to

interpose between them and to effect a separation therebetween to insure that the vibration of one will not interfere detrimentally with the vibration of the other. 20 Preferably, gongs I0 and II are provided at their axes with square holes II and IE to receive the square shank it of a bolt generally indicated by the reference character ll, collar l2 extending about the shank l6. I 25 A preferred form of base or main support comprises a bracket It made of a suitably heavy strap metal and stepped downwardly at its ends, as at [9 and 20, where it is provided with apertures 2| and 22, the former to rest against a 30 suitable supporting surface and the latter serv- ,ing to receive screws or bolts to secure the .ably at its center a square hole 23 through which 35 the shank it of the bolt l1 extends and with which it snugly interflts as do also the holes I and I5 of the gongs l0 and II.

The gongs are actuatedpreferably electrically, as is later described in detail, and in the pre 40 ferred form the lead wires, relatively heavy insulated conductors, as indicated at 25 and 26, are brought out of the apparatus and preferably related to the supporting bracket Hi to facilitate making electrical connection to the circuit con- 45 ductors related to the supporting surface or other part to which the bracket I8 is secured. Accordingly, the bracket I8 is provided with a hole 21 spaced a short distance from its center and preferably alined along the central longi- 50 tudinal axis of the bracket 1 B, the square hole 23 having its center coincident with that axis. Illustratively, the square hole 23 is so related to this central longitudinal axis that two of its opposed parallel edges are at right angles to that axis and the remaining two edges are parallel thereto.

Gong I0 is provided with a hole 23 positioned on a radius that is at right angles to two opposed edges of the square hole H in the gong I3 and at the same distance from the center of hole H as is the hole 21 in the bracket II from the hole 23.

Accordingly, when square holes l4, and 23 are properly registered and maintained in such registry by the interfitting therewith of the square shank l5,

holes

21 and 23 are brought into registry, as shown in Figure 1, and together form a passage for receiving the conductors 25 and 23.

Gong I has a hole 29 also positioned on a radius to which two opposed edges of the square hole I! are at right angles, and again preferably the distance of hole 29 from the center of the square hole I5 is the same as the distance of hole 23 from the center of square hole I 4 in the gong I3. Accordingly, in assembly, when square hole I 5 of gong I l is appropriately allned with the square holes l4 and 23 which are already alined as abovementioned, and these alinements maintained by the square shank I5, registered

holes

21 and 23 are brought and held in alinement with hole 29 in gong H and thus, as shown in Figure 1, the conductors 25 and 25 may be brought not only through the

holes

21 and 23 but also through the hole 29 and thus to the interior of the inner or smaller gong within which is accommodated, in a preferred manner about to be described, the

electro-magnetic mechanism for setting the gongs into vibration.

Adjacent the periphery of gong H (see Figure 1) is a hole 3|, preferably bearing a certain geometrical relationship to the square hole l5 and the hole 29 of the gong. In the illustrative form, hole 3| is on a radius that is spaced angularly from the radius on which is the hole 29, and thus hole 3| is positioned in a predetermined relation to the square hole l5 of the gong l I, for a purpose later described.

The electrically actuated gong-striking mechanism is preferably constructed in sub-units or sub-assemblies to facilitate ease and simplicity of assembly and preferably and particularly to insure simplicity and rapidity of interrelationship of the mechanism to the gongs and supporting structure. The mechanism preferably comprises a solenoid having a winding 32 preferably preformed or prewound in any suitable way between two

end plates

33, 34, preferably made of insulating material, such as fiber, and held in spaced relationship in any suitable way, as by a tubelike member 35. which may be of insulating material and on which the wire of the winding 32 is wound preferably directly.

The

end plates

33, 34 are preferably of identical construction, each having allned downward

extensions

33 and 34 and in Figure 5 one of these end plates is shown in perspective and hence it will suffice to describe only one of them in detail. Thus, there is a central hole 33 with which the tube-like winding core 35 is interrelated as by being received thereinto. Preferably along the vertical center line of the extension 34' I provide two small holes 31, 33, the former being closely adjacent to the hole 33 and hence adja- .cent the innermost layer of the wire of winding 32, so that the terminus or end 32 of that innermost layer may be threaded through the hole 31 to be brought externally of the winding 32 and of the corresponding end plate, such as the end plate 34 of Figure 1.

Hole 33 is positioned at or just beyond the outermost layer of winding 32 so that the end or terminus of that layer, indicated at 32 in Figure 1, may be brought out through the hole 33.

In the outer portion of the extension 34' (Figure 5) I provide a hole 39 large enough to accommodate one of the insulated conductors 25 or 23 and adjacent to it but toward the outermost edge of the extension I provide a conformation also to accommodate the insulated conductor, that conformation being illustratively and preferably in the form of a hole 43 substantially like hole 33 and preferably in close proximity to it.

With the winding thus formed and wih its ends 32' and 32 exposed externally of the end plates through holes 31 and 33, respectively, the

winding may now be assembled to certain other parts of the apparatus, one of which preferably takes the form of a casing generally indicated by the reference character 4 I, the casing being made up preferably of sheet metal and being formed in any suitable way to accommodate and enclose the

winding unit

32, 33, 34.

Thus, the casing may have a top wall 4|, and end walls 4| 4|, the latter preferably having

flanges

42, 43 bent outwardly thereof and into the same plane, a plane preferably parallel to the top wall 4| with which, as is later pointed out, the axis of the winding 32 is preferably parallel; casing 4| may also have opposed side walls 4| and 4|. The casing 4| is preferably integral throughout, may be constructed in any suitable way as by stamping and bending or as by drawing and bending.

Centrally of the end walls 4| and 4| the easing has apertures 44 and 45. The interior dimensions of the casing are preferably such as to accommodate, preferably snugly, the

winding units

32, 33, 34, the latter being slid into it through the open bottom end, as viewed in Figures 1 and 4, it being noted that the

end plates

33, 34 are preferably snugly received between the opposed side walls 4|, 4|, while the extensions 33 and 34' of the end plates project outwardly out of this open bottom end of the casing (see Figure 1).

In this way, the winding unit may be positioned to bring its axis and hence the axis of the tubelike core 35 and of the holes 35 in the

end plates

33, 34 into coincidence with the axis of the alined holes 44, 45 in the end walls 4| 4| of the casing 4|. Thereupon a tube 41, preferably of nonmagnetic material like brass and suitably diametered and preferably longer than the winding unit and easing 4| (see Figures 1 and 2) is fitted through these allned holes, the interfitting being sufliciently close to hold the tube 41 frictionally in place when brought to the position better shown in Figure 1 with its two ends projecting substantially equidistantly from the end walls 4|, 4| of the casing 4|. Tube 41 thus locks the winding unit in the casing 4| and the two now form a sub-unit or sub-assembly by themselves.

Tube 41 may then have assembled to it certain other parts or the latter may initially be assembled to the tube and as a unit assembled to the winding and casing as above described. These parts include a solenoid core 43 of suitable magnetic material and diametered so as to slide freely within the non-magnetic tube 41, whose one end, such as the left-hand end, is closed over in any suitable way by an annular end wall 49 which hence has an aperture 53 therein.

Before inserting the core 43 into the right hand or open end of the tube 41, a helical spring 52 is inserted whereupon a suitably heavy and headed pin 53, preferably of a non-magnetic material like brass and having first slipped over it a short helical spring 54, has its free or unheaded end passed through the hole 50 in the tube end wall 49, through the interior spring 52, whence suitable interconnection between the pin 53 andthe left-hand end of the core 43 is made. Such interconnection may be as by force fitting the end of the pin 53 into a suitable coaxial hole in the end of the core 49 or such a hole may be threaded to receive the threaded end of the pin 53, the latter being the illustrative form shown in Figure 1. These interrelationships of the parts will be seen to be such that the core, pin

and springs are now a unitary sub-assembly by themselves. At its right hand end the core 48 has fitted to it a relatively heavy pin or extension 55 preferably of non-metallic material, such as brass, preferably not headed. It is assembled to the core 43 in any suitable way, as by pressing its one end into a hole in the core 43 or by threading the two parts together. With respect to the extension 55, which is preferably of circular cross-section, the hole 3| in the gong II is proportioned to be of sufficiently larger diameter for purposes later described.

The end flanges 42, 43 are apertured as shown in Figure 1 and their under faces are to contact and mate with the upper faces of the flangelike parts 56 and 51 (Figures 1, 2 and 4) of a U-shaped bracket generally indicated by the reference character 53. Flange parts 55 and 51 have threaded apertures,.asshown in Figure 1, to register withthe apertures in the

parts

42, 43.

The bracket 55 is preferably-made of a suitably,

heavy sheet metal and at its center and in the base portion 59 thereof it is provided with a square hole 59 dimensioned to interflt snugly with the square shank ll .of the bolt l1. It will nections to any streses or strains as might disbe noted that the hole ""is positioned so "that two of its opposed edges are at right angles to the vertical plane in which is the axis of the winding 32 and hence the axis of the core and

striker assembly

53, 43, 55.

Bolt I! now has its shank entered-"through the square hole 35 to bring its head to rest against the upper face of part 59, the U-shape of the part 55 providing ample space for accommodating the head of the bolt. With bolt and bracket 53 thus assembled, the bracket 59 has its parts 56, -1 brought up against the under facs of the

flange parts

42, 43 of the casing 4|, the

flange parts 56, 51 having slots 52,- 63, respective- 4 of sufficient dimension to permit the eaten sions 33', 34' of the end plates 33 and "to pass downwardly therethrough, as appears better from Figures 1 and 4. Then screws 34, 95 Figure l) are used to secure the bracket 53 and the housing unit together.

It will be understood, of course, that the order or sequence in which some of the above described steps of assembly are carried out may be varied or changed, as may be desired or as may be more convenient. For example, after inserting the winding

unit

32, 33, 34 into the casing 4|, the bracket 53, with the bolt l1 assembled thereto,

may be secured to the casing, and then the core and striker assembly, such as the tube 41 ofthe of the end plates with the free ends 32' and 32 of the winding 32 projecting laterally of the extensions, and thus ready to have the heavier lead wires 25 and 26 related thereto.

In the preferred arrangement, each lead wire is mechanically anchored to its associated end plate extension and then its conductor is electrically connected as by soldering to the corresponding end of the winding.-

A preferred arrangement for anchoring the lead wire is as shown in Figure 1. Thus, the conductor 25, after having a short length of its insulation stripped from its end so as to bear the conductor thereof, is bent into the shape of a U, asat- 25, the free or short end of the latter being passed through the hole 33 in the extension 33 and the longer or other end seated in the conformation 49 (see Figure 5) of the extension, thus exposing the bared end of the lead wire 25 on the same side of the extension 33' on-which the end 32 of the winding is With the heavier lead wire 25 thus interlocked with and anchored to the end plate 33, its bared end may now be electrically connected to the wire 32, as by soldering. The other lead wire 25 is similarly treated with respect to the extension 34* of the other end plate, being given the shape of a U, as at 25", the arms of which pass through the

conformations

39 and 45 of the extension and its bared end being connected as by soldering to the end 32 of the winding.

Thus, while-the wire of the winding 32 and hence its ends 3'2 and 32 may be relatively small or fine in size and the lead wires 25 and 25 relatively heavy, the latter, are dependably anchored mechanically and thus any bending or movement, during handling and assembly of the heavier lead wires 25, 26, is prevented from subjecting the fine wire ends 32', 32' or the solderedconrupt them.

The resultant sub-assembly, in the illustrative form. thus comprises the housing or casing 4i, 59 with the above-described parts assembled thereto, the lead wires 25 and 25 and the square shank it of the bolt i'I projecting downwardly therefrom. Next, the gong II is related to this sub-assembly and first the lead wires 25, 25 are passed through the hole 29 in the, gong, thus bringing the sub-assembly and the gong II in proper angular relationship for the passage of the square shank it of the bolt into and through the square hole ii of the gong and also, bearing in: mind the above-described relationship be-- tween the holes 29, i5 and 3|, bringing the striker pin 55 in general alinement with the hole 3|. The striker pin 55 is entered throughthe hole 3| of the gong, then the square shank of the bolt entered through the hole i5 of the gong II, the

collar or spacer l2 slipped onto the bolt shank,

. the free ends of the lead wires 25, 25 passed through the

holes

28 and 21 of the gong Ill and positioning of gong Ill and bracket II to permit the square shank of the bolt to enter the square holes I4 and 23 of the gong Ill and bracket i8 in proper relationship.

A suitable lock-washer 51 may then be slipped onto the bolt shank, whence a nut 53 is threaded onto the threaded end l6 of the shank and tightened up to draw the parts 58, ll; I2, l0, l3 and 61 tightly together to hold them in assembled relation. It will. be noted that the bolt I1,

through the relationship between the cross-section of its shank and the shape of the holes in the structural parts, is prevented from rotating relative to the latter so that tightening up of the nut 68 is easily achieved, while, also, relative rotary displacement of any of the structural parts about the axis of the bolt I! is dependably precluded and the relationship of assembly of the parts dependably maintained.

For example, these latter actions insure that the striker pin 55 of the core has its axis substantially coincident with the center of the hole 3| in the gong ii; the difference in diameters of these two parts being suificient to allow for adequate clearance between the two parts. Also, relative twisting between the electromagnetic subasscmbly, such as the casing 4!, 58 with the parts carried by it, relative to the gong Ii, or between the gong l l and the gong ill or between the gong l0 and the supporting bracket l8, cannot take place and thus the danger of shearing the lead wires 25 and 26 or of injuring the insulating covering thereof is dependably eliminated.

In this form the unit or apparatus may be installed, the winding 32 being connected to the circuit by utilizing the lead wires 25 and 25 which conveniently may also be made to pass through a hole 59 in the bracket l8, as in Figure 1, to bring the ends of the leads to the same side of the plane of the bracket parts I9, from which the securing screws or bolts are put in place.

In effecting the assembly, as above described, lead wire 26 is bent or conformed, as is better indicated at in Figure 3, to extend about or around the bracket 58 and to the hole 29 (Figure 1) through which it is extended with the lead wire 25, as above described.

In operation, the movable parts are normally in the position shown in Figures 1 and 2; upon energization of the winding 32, the magnetic flux produced by the latter is effective to pull the core 43' relatively quickly to the left, compressing the spring 52, the striker pin 53 giving the gong il a blow, the core with the parts carried by it rebounding, aided by the action cf the energy stored in the compressed spring 52. If the circuit is thenbroken, as it would be if controlled, for example, by a push button switch, the core 48 is quickly thrust by the expansion of the spring 52 in a direction toward the right, causing the striker pin 55 to strike the gong ill. During the movement in this latter direction the shorter and relatively light spring 54 is compressed to aid in restoring the moving parts, on the ensuing reboundyto the normal position as shown in Figure i. If the winding 32 is not immediately deenergized, the magnetic flux holds the core 48 Sumciently to the left and the spring 52 sufliciently compressed, but with the striker pin 53 out of contact with the gong Ii, to insure, when the winding becomes deenergized, that the spring 52 thrusts the core 48 to the right with suflicient energy to cause the striker pin 55 to strike the other gong H) as above described.

Thus, the signaling apparatus sounds two notes of different pitch, and in this connection it is to be noted that I have discovered that the quality of the musical note sounded is substantially unimpaired by the fact that the gongs have holes drilled or provided in them, such as the

holes

3i, 29 and 28. The latter two

holes

28 and 23 are preferably positioned relatively closely to the axis of the belt I! and thus have a minimum efiect upon the character of vibration of the respective gongs. Hole 3!, however, will be seen to be positioned, in the illustrative embodiment, in that region of the gong II that is subjected to vibration in nodes and inter-nodes, yet, as above noted, the presence of hole 31 has, I have discovered, a negligible, if any, effect, for practical purposes, upon the action of the gong itself.

Thus, it will be seen that there has been provided in this invention a signaling apparatus in which the various objects above noted, together with many thoroughly practical advantages, are successfully achieved. It will be seen that the apparatus is of dependable and unique action in practical use, yet is of thoroughly practical construction and of inexpensive manufacture.

' As many possible embodiments may be made of the above invention and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth, or shown in the accompanying drawing, is to be interpreted as illustrative and not in a limiting sense.

I claim:

1. In signaling apparatus, in combination, two gongs of generally convexo-concave shape, one being smaller than the other and received within, and with its convex side facing toward the con cave side of, the larger, a solenoid having a core with striker elements at each end of the latter, a support for said solenoid for positioning it within the concavity of the smaller gong with the axis of said core alined substantially along a diameter of said smaller gong, the latter having an aperture for the passage therethrough of one of said striker elements, said gongs each having a hole substantially at its center and said support having non-rotatably connected with it a studlike member for entry into and interfltting with the holes in said gongs and for thereby alining said solenoid and said two gongs, said stud-like member and the hole in said smaller gong having cross-sectional shapes to effect non-rotational interfitting between said support and said smaller gong and thereby alining the axis of said core and of one of said striker elements with said aperture for movement of said striker element into engagement with the larger gong upon movement of said core in one direction and thereby alining the other striker element relative to the smaller gong to engage the latter upon movement in reverse direction of said core.

2. In signaling apparatus, in combination, a gong having a hole substantially at its center and an aperture displaced from said hole, gongstriking mechanism comprising a striker and electro-magnetic means for actuating said striker, said gong-striking mechanism having means adapted to enter said hole in said gong for positioning said mechanism and said gong so that the striker is operatively positioned relative to the gong, said mechanism having a lead wire extending therefrom and through said aperture in said gong, said means and said hole being shaped to eifect non-rotatable engagement therebetween and for thereby preventing relative rotary movement about the axis of said gong and between the latter and said mechanism, thereby to prevent shearing strains on said lead wire passing through said aperture.

3. In signaling apparatus, in combination, a gong having a hole substantially at its center, a bracket support having a hole adapted to register with said first-mentioned hole, said gong and bracket each having an aperture registrable one withanother when said gong and bracket support have a certain relation to each other about the axis 01' said gong, electromagnetic gong-strikfor said gong having a lead wire and a supporting member provided-with a hole substantially similar to said polygonal hole, means for securing said mechanism and said gong together and comprising a polygonally cross-sectioned member interfitting with said two polygonal holes and thereby fixing the relative angular position of said gong and mechanism, said gong having an aperture therein fixed in position by the interfitting between said holes and said polygonal member for the passage therethrough of said lead wire.

5. In signaling apparatus, in combination, a gong having a polygonal hole substantially at its center, electromagnetic striking mechanism for said gong having a lead wire and a supporting member provided with a hole substantially similar to said polygonal hole, means for securing said mechanism and said gong together and comprising a polygonally cross-sectioned member interfitting with said two polygonal holes and thereby fixing the relative angular position of said gong andmechanism, said mechanism comprising a winding of relatively fine wire and having interlocked with said supporting member a plate-like member of insulating material which has anchored thereto a relatively heavy insulated lead wire that has electrically connected to it said fine-wire of said winding, said gong having an aperture therein fixed by the interfitting of said member with the said hole in said gong for the free passage therethrough of said lead wire, wherebyv strains imposed upon said lead wire are taken up by said insulating member and said fine wire relieved from strain.

6. In signaling apparatus, in combination, a sounding element having an aperture, a bracket support having an aperture, electromagnetic means for setting said sounding element in vibration, said means having a lead wire of a length suflicient to extend through the aperture in said sounding element and through the aperture in said bracket support, said electromagnetic means having a part with a hole in it and said sounding element and bracket support each having a hole, said,holes being alined, and a member passing through said three holes and having nonrotatable engagement with the walls of said holes for securing said bracket support, said sounding element and said part together and for holding said two apertures in alinement for the reception therethrough of said lead wire.

, 7. In signaling apparatus, in combination, a sounding element having an aperture, a bracket support having an aperture, electromagnetic means for setting said sounding element in vibration, said means having a lead wire of a length siifllcient to extend through the aperture in said sounding element-and through the aperture in said bracket support, said electromagnetic means comprising a casing-like closure therefor, said closure having a detachable part with a hole therein for the reception of a headed stud-like member, the head of which is substantially with- ,whereby said stud-like member is in said casing-like closure, said sounding element and bracket support each having a hole through which said stud-like member passes for alining them relative to said enclosure and hence to said electromagnetic means.

8. In signaling apparatus, in combination, a

sounding element, electromagnetic means for setting said element into vibration, said electromagnetic means having a bracket-like part with means detachably securing the latter thereto, said bracket-like part having a hole therein with a headed stud-like member extending therethrough but with the head accommodated between said bracket-like part and the rest of said electromagnetic means, and means for securing said sounding element to said stud-like member.

- 9. In signaling apparatus, in combination, a sounding element, electromagnetic means for setting said element into vibration, said electromagnetic means having a bracket-like. part with means detachably securing the latter thereto, said bracket-like part having a hole therein with a headed stud-like member extending therethrough but with the head accommodated between said bracket-like part and the rest of said electromagnetic means, a supporting member having an aperture for the reception of said studlike part for mechanically interconnecting said member and said electro-magnetic means, and means supporting said sounding element in operative relation to said electromagnetic means.

10. A sub-assembly comprising electromagnetic striker mechanism having a winding and a casing-like enclosure therefor, the latter having a detachable bracket-like part with a hole therein, a headed stud-like member received in said hole with the head accommodated in the space between said part and the rest of said mechanism,

exposed externally of said mechanism.

11. A sub-assembly comprising electromagnetic striker mechanism having a winding and 9. casing-like enclosure therefor, the latter having a detachable bracket-like part with a hole therein, a headed stud-like member received in said hole with the head accommodated in the'space be-. tween said part and the rest of said mechanism, whereby said stud-like member is exposed externally of said mechanism, and is thereby available for association therewith of other parts, said electromagnetic mechanism having a lead wire externally thereof with means mechanically anchoring said lead wire thereto against strains imposed upon the lead wire, there being means forming an electrical connection between said anchored lead wire and said winding,

12. A sub-assembly comprising a casing open at one end, a winding having end plates with the two ends of the windings mechanically interrelated with portions of said end plates respectively, said winding with said end plates-being receivable into said casing through the open end thereof and said end plates having said portions projecting beyond the open end of said casing, and a member taking over the closed end of said casing and havingcut away portions to accommodate said portions of said end plates, the latter having means for mechanically anchoring thereto relatively heavy lead wires, one to each end plate portion, for electrical connection to the respective ends of said winding.

13. A sub-assembly as claimed in claim 12 in which said member has a hole therein with the shank portion of a headed stud-like member 7 received in said hole and with the head on that side of said member that faces inwardly of said casing.

14. A sub-assembly comprising a casing open at one end, a winding having end plates with the two ends of the windings mechanically interrelated with portions of said end plates respectively, said winding with said end plates being receivable into said casing through the open end thereof and said end plates having said portions projecting beyond the open end of said casing, and a member taking over the closed end of said casing and having cut away portions to accommodate said portions of said end plates, the latter having means for mechanically anchoring thereto relatively heavy lead wires, one to each end plate portion, for electrical connection to the respective ends of said winding, said member having a hole therein with the shank portion of a headed stud-like member received in said hole and with the head on that side of said member that faces inwardly of said casing, a sounding element, said winding having means for coacting with said sounding element to set it into vibration, said sounding element having a hole for the reception of the shank portion of saidstud member and having aperture means for the passage therethrough of said lead wires, said shank portion having non-rotatable connection with said sounding element to thereby properly locate and hold said aperture means relative to said lead wire anchorages.

15. A sub-assembly comprising a casing open at one end, a winding having end plates with the two ends of the windings mechanically interrelated with portions of said end plates respectively, said winding with said end plates being receivable into said casing through the open end thereof and said end plates having said portions projecting beyond the open end of said casing, and a member taking over the closed end of said casing and having cut away portions to accommodate said portions of said end plates, the latter having means for mechanically anchoring thereto relatively heavy lead wires, one to each end plate portion, for electrical connection to the respective ends of said winding, said member having a hole therein with the shank portion of a headed stud-like member received in said hole and with the head on that side of said member that faces inwardly of said casing, supporting means having a hole therein for the reception of the shank portion of said stud-like member and having aperture means for the passage therethrough of said lead wires, said stud-like member fixing the relative position of the parts for the proper passage through said aperture means of said lead wires.

16 A sub-assembly comprising a casing open at one end, a winding having end plates with the two ends of the windings mechanically interrelated with portions Of said end plates respectively, said winding with said end plates being receivable into said casing through the open end thereof and said end plates having said portions projecting beyond the open end of said casing, and a member taking over the closed end 01' said casing and having cut away portions to accommodate said portions of said end plates, the latter having means for mechanically anchoring thereto relatively heavy lead wires, one to each end plate portion, for electrical connection to the respective ends of said winding, said member having a hole therein with the shank portion of a headed stud-like member received in said hole and with the head on that side of said member that faces inwardly of said casing, a sounding clement, said winding having means for coacting with said sounding element to set it into vibration, said sounding element having a hole for the reception of the shank portion of said stud member and having aperture means for the passage therethrough of said lead wires, supporting means having a hole therein for the reception of the shank portion oi said stud-like member and having aperture means for the passage therethrough of said lead wires, said holes and said shank portion having cross-sectional shapes to hold their respective parts against rotary movement relative to each other and thereby holding the aperture means in said sounding element and in said supporting means in proper relationship for the passage therethrough of said lead wires.

17. A sub-assembly comprising a casing open at one end, a winding having end plates, said winding with said end plates being receivable into said casing through the open end thereof and said end plates having portions projecting beyond the open end of said casing, means for holding said winding within said casing, said end portions of said end plates each having aperturelike conformations with a lead wire substantially U-shaped at its end and interlocked with said plate end portions through said aperture-like conformations, thereby to anchor said lead wides to said end plates, said lead wires having electrical connection with the respective ends of said winding.

18. A construction as claimed in claim 17 in which the means for holding said winding in said casing comprises tube-like means, said winding having a conformation to permit the passage therethrough of said tube-like means and opposed ends 01' said casing having apertures for receiving opposed ends of said tube-like means, said tube-like means forming a support for a core means of magnetic material for said winding.

19. In signaling apparatus, in combination, a sounding element, electromagnetic means for setting said element into vibration and comprising a winding having end plates, means mechanically assembling said sounding element and said electromagnetic means and including two spaced parts between which said winding with said end plates respectively adjacent said two spaced parts is received, at least one of said end plates having mechanically anchored thereto a lead wire which is in electrical connection with said winding, and means for holding said winding with its end plates against displacement relative to said two spaced members whereby strains on said lead wire are transmitted through said end plate to the spaced part to which it is adjacent.

20. A construction as claimed in claim 19 in which the means for holding said winding ami its end plates against displacement relative to said two spaced parts comprises tube-like means passing through the spaced parts and the respectively adjacent plate members and through the winding, said tube-like means forming a support for a core means oi magnetic material, and means whereby energimtion or said winding e1- fects vibration of said sounding element through said core means.

ROBERT 8. EDWARDS.