US2386964A

US2386964A - Loud-speaker

Info

Publication number: US2386964A
Application number: US510325A
Authority: US
Inventors: Mildred F Lucas
Original assignee: OPERADIO Manufacturing CO
Current assignee: OPERADIO Manufacturing CO
Priority date: 1943-11-15
Filing date: 1943-11-15
Publication date: 1945-10-16
Anticipated expiration: 1962-10-16

Description

C. 36, i945. M E LUCAS g@ LOUDSPEAKER Filed Nov. l5, 1943 y INVENTOR.

Al/gfgdf/TZMCM Patented Oct. 16, 194,5

LOUD-SPEAKER Mildred 1F. Lucas, St. Charles, lli., assigner to Operadio Manufacturin g Co., St. Charles, Ill.,

a corporation of Illinois Application November l5, i943, Serial No. 510,325

2 Claims. (Cl. 179-1155) This invention relates to loudspeaker units designed for-use with radio'reccivers, public address systems andthe like, and it is particularly dlrected to supporting means for the conducting c'ables which are included insuch units..

One object of the invention is to provide. a. new and improved loudspeaker unit for radio receivers and the like.

Another object of the invention is to provide an improved support for a conductor cable closely associated with a loudspeaker unit.

More specifically, it is an object of the inventionto simplify the construction and to eliminate a. possible source of vibration in a loudspeaker unit by forming the frame member which encompasses the transformer of the unit with an integral lug of sufficiently pliable material to be b'ent around a cable of lead wires of the transformer and other parts of the speaker to provide support for such cable in proper relation to the unit Other objects and advantages of the invention will appear from the following description taken in connection with the4 drawing in which:

Fig. 1 is a rear' elevational view of an electro-- 'dynamic type of speaker unit embodying this invention. v

Fig. 2 is a side elevation of the same.

Fig. 3 is a rear elevation with a portion broken away, showing a permanent magnet type of speaker unit with this invention applied thereto.

Fig. 4 is a side elevation of the same.

Fig. 5 is a perspective view of a transformer frame member having a special lug for supporting a cable in accordance with this invention.

While the invention is susceptible of various modifications and alternative constructions, the embodiments shown in the drawing and described hereinafter are by way of preferred illustration only, and it vis not intended that the invention be limited thereto or thereby, but it is the intention to cover all modifications and alternative constructions falling within the scope of the invention as defined by the claims.

Figs. 1 and 2 show a typical loudspeaker unit of the electrodynamic type including a main frame i, usually stamped from sheet metal and supporting a speaker cone l0, together with a field coll indicated at 2 and a transformer indicated generally at 3. Lead-in wires 4 for the transformer and lead wires 5 for, the field coil are combined in a cable 6 provided with a terminal plug l for connecting the speaker into the circuit of a radio receiver, public address system or otherlike apparatus. The transformer 3 includes cover shells 8 for its coil and a rectangular frame 9 which may be formed of sheet metal with side flanges 9 giving the frame a channel shape so that it encompasses the transformer coil on three sides. I

encloses the plates of the transformer at their edges and retains in position the cover shells d, 8 by overlapping engagement with marginal flanges thereof. The frame 9 is provided with perforated lugs Il and I2 through which fastening bolts i8 extend into securing engagement with portions of the frame l.

In accordance with this invention the lug I2 is made considerably longer than the lug H, and its terminal portion I2a is sufficiently pliable so that it can be readily bent around the cable 6 to encompass the latter and hold it in proper relation to the parts of the speaker to prevent any strain on the lead wires 4 and 5 which might tend to break or disturb the electrical connections. This extension of the lug I2 to serve as a support for the cable avoids the use of a separate supporting member and precludes the possibility of' such separate Support becoming loosened or being slightly spaced from an adjacent part so that it would vibrate during operation of the speaker 0r in response to tones of certain pitch, thus impairing the clarity of tone of the instrument.

, extending from Such vibration might even become severe enough to completely loosen a separate supporting lug,

permitting it to swing out of its originally clamped position, whereas the integral lug l2,

the foot or mounting lug l2 of the frame 9, is permanently located when it is r once bent around the cable 6.

Figs. 3 and 4 illustrate a speaker unit of the permanent magnet type in which the `frame 2| supports a cone 20 and a. voice coil 22, together with a transformer unit 23. The lead wires 2@ for the transformer are carried in a cable 2S to a terminal plug 26 and the

transformer cover shells

8, 8 are held in place by the rectangular frame 9 with its side flanges 9, this frame being similar in all respects to the frame 9 shown in Figs. 1 and 2. The' frame is secured to a mounting bracket 28 by foot flanges Il and l2, and the flange l2 is extended at l2a and curled around the cable 25' to` provide support therefor in the same manner as-the lug I2*1 of Fig. l.

Fig. 5 illustrates the frame` 9 as it appears when removed from the transformer, with its side flanges 9a forming an inwardly open channel structure to engage the plates and cover shells of the transformer, and with itsfoot flanges ll and l2 perforated to receive securing bolts, as described. 'I'he portion l2a is shown extending of the speaker. its close contact with the soft covering of the cable I will cause said covering to damp any vibrations of the lug I2".

I claim as my invention:

1. In a loudspeaker unit, a transformer with a frame member encompassing said transformer and having perforated lugs with fastening members extending through said lugs and into a part of said unit for securement of the transformer on the unit, and a conductor cable extending assaaes from an attachment plug and including lead wires for the transformer. one of said lugs havl ing an integral extension bent around and gripping said cable to support it in proper relation to the transformer.

2. In a loudspeaker unit, a main frame, a diav phragm supported thereon, a eld coil secured to the frame, a transformer including a metallic frame fitted over the transformer and having integral perforated lugs, clamping members extending through the perforations of said lugs and securing said lugs rigidly to said main frame, and a cable including all the inleading wires for the speaker, .said cable terminating in a detachable connecting plug and having a relatively soft insulating jacket, one of said lugs of the transformer frame having an integral extension bent around said cable embracing and gripping said soft Jacket to support said cable. said jacket 20 serving to damp vibration of said lug.

MILDRED F. LUCAS.