US2140792A - Vibrator - Google Patents

Description

Dec. 20, 1938. H. M. DRESSEL ET AL 2,140,792

v VIBRATORy Original Filed Deo. 24, 1934 f/z Way/07:2 @gigi We@ ai mm Patented Dec. 20, 1938 UNITED STATES PATENT OFFICE Arlington Heights, and Edward J. Mastney, I Berwyn, lll., assignors to Oak Manufacturing Company, Chicago, Ill.,

linois a corporation` of Il- Orlginal application December 24, 1934, Serial No.

758.924. Divided and this application September 27, 1937, Serial No. 165,862. Renewed ctober 12, 1938 1s claims. (cl. zon- 90) This invention relates to vibrators and more particularly to vibrators for use in connection with automobile radios and the like. In vibrators of this type, it is customary to provide a reed rigidly clamped at one end with an armature at the free end. This reed is adapted to be vibrated back and forth at high speed to make and break the power supply circuit connections to a step-up transformer. In vibrators of this type, the high speed of the reed generates a high frequency noise, which is particularly penetrating and objectionable.

An object of this invention is to devise a mounting for such a vibrator, which will be simple, cheap and will permit of eillcient operation of the vibrator without transmission of the noise to the outside. f

Referring to the drawing, Figure 1 shows a sectional elevation of a vibrator, embodying the present invention. Figure 2 shows a view of the same vibrator in partially disassembled condi- -tion and at right angles to Figure 1. Figure 3 is a view partly in section similar to Figure 2, except that the vibrator is in assembled position.

Referring to the drawing, the vibrator comprises a generally U-shaped frame I, of magnetic material, such as iron. Frame I has 'a bight portion 2, in the vcenter of which is mounted a pole piece 3. This piece is preferably narrower than frame I, as shown in Figure 2, and extends downwardly toward the` open arms of frame I. Pole piece 3 has a tip 4, which is loiiset from the body of the pole piece, so that tip 4 is eccentric with respect to the two arms of frame I. Pole piece 3 may be fastened in bight portion 2 in any manner, such as by projecting through an aperture in bight portion and spreading the metal on the outside.

Disposed around pole piece 3 is a spool 5, preferably containing two windings and connected in a manner to belaterdescribed. Frame I is composed of two arms I0 and II, connected by bight portion 2. Arms III and Il preferably have their ends I2 and I3 bent toward each other at regions I4 and I5. Between ends I2 and I3 is clamped the entire vibrator system.

` This comprises a reed generally designed as 20 and to be described in further detail later. Said reed carries a movable .driving contact 2|, adapted to cooperate with a fixed driving contact 22, adiustably mounted on threaded portion 23 in arm II of the frame. Contact 22 may be adjusted to any desired position and locked therein by means of a nut 25. In addition, reed 2|I carries a pair of movable contacts 26 and 2l,

adapted to cooperate with fixed contacts 28 and 29.

Reed 20 is maintained in position by having its end 30 rigidly clamped between a series of metal spacer plates 3| and 32. Next to these plates 3| and 32 are disposed insulating separators 34, 35, 36 and 3l, preferably of mica. Between each adjacent pair of insulators there is disposed supporting arms 40 and 4I, carrying stationary contacts -28 and 29. These arms are spring-like and have a natural frequency substantially higher than the natural frequency of reed 20. Beyond the insulators are additional metallic spacer plates 42 and 43, adapted to snugly illl up the space between ends I2 and I3 of frame I.

This entire assembly is maintained intact by means of a pair of bolts 45 and 46. Every one of the spacers and insulators between ends I2 and I3 are provided with suitable apertures, through which these bolts may be threaded. As shown in Figure l, these apertures are sufficiently greater in diameter than the bolts, so that a suitable insulating region may be formed, which may be occupied by an insulating sleeve. Bolts 45 and 46 are provided with nuts 4l, which maintain the entire' assembly rigid.

Referring to reed 2li,l the drawing shows the spring suitably punched out. Spring 20 has its bottom portion provided with the apertures 50 and l, previously generally described for the reception of bolts 45 and 46. Above bottom portion 30, which is adapted to be rigidly clamped, is a primary pivotal portion 52. This portion preferably has a small rectangular region 53 punched out. Thisregion 53 is symmetrically located with respect to the sides of the spring and has its long dimension transverse to the spring. Above region 52 is a region 55 carrying a pair of rivets 56 and 5l. These rivets are preferably in line with each other on a horizontal axis, and are spaced sufficiently Wide apart so that each rivet goes through an outer part of the spring. Above region 55 is a region 60, having a long centrally disposed cutout 8|. The cutout has preferably the same width as portion 53 and is located in line therewith. Cut-v out 6I has its greatest length along the length .of reed 20, and has a small'spring 62 therein.

This spring is integral with main spring 20 and has an enlarged rounded head63, carrying driving contact 2|.

,The free end 65 of spring 20 is adapted to carryan armature 66, riveted thereto at 67 and 88. It will be noted that rivets 61 and 88 are preferably co-linear with 56 and 51.

Rivets 56 and 51 are adapted to support on each side of spring 2li rigid arms 10 and 1|. These arms are preferably bent so as to are outwardly and comprise a broad mounting region 13, of the same width as spring 20, and a narrow contact supporting portion. These arms, 18 and 1|, support movable contacts 26 and 21. Between arms 18 and 1| is supported a rigid arm 14 abutting against spring B2. In the normal position of reed 20, contacts 2| and 22 are tightly closed. To prevent spring S2 from maintaining the contacts in closed position as reed 28 moves away, abutment 14 moving with the main body of reed 28 carries'spring 62 with it to open the driving contacts. Hence, in spite of any bias of spring 62 tending to keep the driving contacts closed,

even after reed 20 has started to move away, member 14 immediately opens these contacts.

As is evident from Figure' 1, the entire reed assembly is so supported that in its position of rest, driving contacts 2| and 22 are closed and armature 66 is to one side of pole tip 4. In operation, the interaction between pole tip 4 and armature 56 suffices to cause the reed to vibrate. This vibration results in a fiexure at region 52 opening driving contact 2|. By virtue of inertia and the impact with cooperating contact 22, there is also a flexure of spring 82, relative to spring 28. In addition, there is considerable fiexure at region B0.

Supporting arms 40 and 4| are preferably resilient enough so that when any one pair of contacts are together they remain so while reed 28 is traveling toward the center position. When' the center position has been attained, the contacts separate. Arms 40 and 4| are stiff enough so that their natural frequency is substantially higher than that of reed 28. Hence, even though one of these arms is moving towards its extreme position, nevertheless, the contact separation is quick and sharp.

The various contact carrying members are provided with soldering lugs 15, to which may be soldered suitable wires. through small exible rubber tubes 11, of a resilient mounting 18. This mounting comprises a soit rubber member, having a rectangular cupshaped portion 80, adapted to enclose the bottom of the vibrator unit. The bottom of cup-shaped portion 88 has formed thereon a flange 8|, having a projecting rim 82, surrounding tubes 11. The wires threaded through tubes 11 are preferably soldered to the prongs 85, rigidly mounted in a disc 86 of hard insulating material. 'Ihis disc has a circular configuration of approximately the dimensions of rim 82 with the exception of a projection 83. Above this projection is a sol,- dering lug 84 riveted to one of the prongs 85 and, in practice, connected to the ground wire. As shown in Figure 9, when the vibrator is put into can 81, insulating disc 86 is cocked to permit lug 84 and projection 83 to project through an aperture in can 81.

A metal can 81 is provided at its open end with a circular constriction 88, and thereafter with an annular region 89, terminating in a lip 88. As is evident in Figure l, portion 82 is adapted to be jammed under constriction 88 to jam the rubber in place and the entire assembly is maintained by means of a spring ring 9|. Projection 88 vand lug 84 passing through an aperture in can 81 lock the vibrator against turning relatively to can 81.

These wires are threaded Lug 84 is bent up against can 81 and soldered thereto to ground can 81.

As shown in Figures 1 and 9, when the vibrator is in position inside of can 81, and above insulating base 86, the rubber tubes 11 are distorted from their natural Straight position into a bent position. By virtue of the compressing of the rubber tubes and the outer flange 82, the entire assembly is maintained intact in a flexible but firm manner.

To prevent excessive displacement of the top end of the vibrator structure, there is preferably disposed a soft rubber cap |08, over the top of the vibrator assembly. This cap has a downwardly extending iiange IDI, which is adapted to lie along the top portion of the vibrator structure and two wing portions |02 and |03 extending from opposite sides, and perpendicular to the line of motion of the reed, adapted to clear the inside of can 81. This entire rubber assembly has a rectangular cross-section, as Shown in Figure 3, for snugly fitting over the top end of the vibrator and while permitting a certain degree of motion, nevertheless tend to dampen the vibration` of the structure and prevent contact with the metal can.

'This is particularly true with the cap position as shown.

This is a division of our application, Serial No. 758,924, Afiled December 24, 1934.

Having described this invention, claimed is:

1. A vibratable device comprising an elongated magnetizable member having a pole piece. a reed rigidly supported by vsaid member at one end thereof, the free end of said reed carrying an armature and being disposed adjacent said pole piece, a magnetizing coil carried by said member and reed and connected to said coil to energize the vibrator, a means for supporting said vibrator structure comprising a soft rubber cup, into which an end of said vibrator structure rests. said rubber cap having a protruding annular flange extending therefrom, and means for rigidly clamping the peripheral portion of said ange.

2. The structure of claim l, wherein said flange clamping means includes the rim of a cup member, adapted to enclose said vibrating structure.

3. The structure of claim 1, wherein said rubber member has exteriorly projecting tubular members, through which the leads for said vibrator are threaded and insulated from each other, when said vibrator is normally positioned.

4. The structure of claim 1, wherein a metallic cup-shaped member encloses said entire vibrating structure with the rim thereof in clamping relation to the flange of said rubber, and wherein a soft rubber cap is disposed over what is the free end of said vibrator structure.

5. In a device of the character described, the combination of a circular base carrying a plurality of contact prongs, a vibrating circuit making and breaking device mounted on said base, a cylindrical metallic cup-shaped can adapted to cover said vibrating device and having its open end closed 1by said base, said base having a peripheral projection, a metallic member connected to one of said prongs disposed adjacent said projection, said can being apertured near the edge thereof for the reception oi said projection and metallic member, whereby when said device is assembled, 'said projection mechanically lock: said can to said base and said metallic member being connected to said can for grounding thi same.

arcor/as 6. A vibrating device, comprising an elongated frame, a reed rigidly clamped at one end of the frame and extending toward the other end of the frame, means for vibrating said reed transversely to said frame and means for supporting said 'vibrator at one end, said supporting means comprising a sponge rubber cup enclosingan end of said vibrator, said cup having a protuding annular flange extending therefrom and means for rigidly clamping said flange.

' '1. A vibrator, comprising` an elongated base, a reed rigidly clamped at one end thereof and extending toward the other end thereof, means for vibrating said reed transversely to said base, means for supporting said vibrator at the end of said base nearest the fixed end of the reed, said means comprising a sponge rubber cup snugly fitting over said vibrator base, said cup having an outwardly extending flange, and means for rigidly clamping said ange to support said entire structure.

8. The structure of claim 7, wherein a can is provided for covering said vibrator, the open end of said can being disposed at the flange and forming a part of the clamping means.

9. The structure of claim 7, wherein a can is provided for covering said vibrator with the open end oi said can forming a part of the clamping meansv at said flange and wherein a sponge rubber cap is provided for the free end of said vibrator base near the closed end of said can.

10. A vibrator, comprising an elongated base, a reed rigidly clamped 'at one end thereof and extending toward the other end thereof, means for vibrating said reed transversely to said base, means' for supporting said vibrator on an insulating disc, said disc having a plurality of contact making prongs, connections between said vibrator and said Contact making prongs, a metal can for enclosing said entire vibrator and having an opening corresponding to said insulating disc, said metal canhaving a -slot through'the material near the open end thereof, said insulating disc forming a cover for said can and provided with a small tongue adapted to fit into said slot for locking the two together.

1l. A vibrator, comprising an elongated base supporting a reed at one end thereof, said reed having a free end extending toward the other end of said base and adapted to vibrate, a sponge rubber cup enclosing one end of said base for supporting the same, a rigid insulating disc below said sponge cup, said disc having a plurality of contact making prongs, connections from said vibrator to said prongs, a can for en closing the vibrator, said can having an open end adapted to be closed by said disc, said can having means around the edge thereof for supporting said insulating disc against excessive movement with-` in the can, said can having an aperture near the edge thereof and said disc being provided with a tongue adapted to be threaded through said aperture whereby the entire construction is locked after said disc is inserted into pla e.

12. The structure of claim 11 whereir/ means are provided for maintaining said disc down against said can opening.

13. The structure of claim 11 wherein said connecting wires are threaded through said sponge rubber.

14. A vibrator including an elongated frame,

,means for supporting said frame on one end thereof. said means comprising a sponge rubber base shaped to provide a compartment into which the frame end is disposed, leads for said vibrator threaded through said rubber base and depending from the bottom thereof, a disc carrying a plurality of connectors, said leads going to the disc connectors and a metal member encircling said disc and extending upwardly therefrom surrounding and contacting said rubber base for SUDDGIHE the Same.

15. A vibrator including an elongated frame, means for supporting said frame on one end thereof, said means comprising a sponge rubber base shaped to provide a compartment into which.

the. frame end is disposed, said rubber base having another compartment in back to back relation with said first compartment, leads for said vibrator threaded through the intervening wall between said compartments, and means for supporting said rubber base around a peripheral surface thereof.

16. The structure of claim 15 wherein a rigid insulating disc is disposed as a cover for the bottom compartment, said `insulating disc carrying a plurality of connectors with said leads connected thereto and means for retaining said disc against said rubber.

V17. A vibrator including an elongated frame, means for supporting said frame on one end thereof, said means comprising a sponge rubber base shaped to provide a compartment into which the frame end is disposed, lea'ds for said vibrator threaded through said rubber base and depending from the bottom thereof, a rigid insulating disc disposed against said rubber base bottom, said disc carrying a plurality of connectors with said leads connected thereto, a rigid cup enclosing said vibrator, said cup having one open end adapted to fit around saidrigid disc and means for locking said disc to said cup.

18. The structure of claim 17 wherein said rubber base is supported around the peripheral surface thereof.

HENRY M. DRESSEL. KENNETH C. ALLISON. EDWARD J. MAS'INEY.

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