US1812525A - Radio tuning mechanism - Google Patents

Description

June 30, 1931. w. GOODWIN RADIO TUNING MECHANISM Filed Oct. l1, 1930 /l/ Ilm Patented June 30, 1931 YUNITED STATES PATENT OFFICE WINSLOW GOODWIN, OF CHICAGO, ILLINOIS, ASSIGNOR TO ORDINE NAME PLATE 85.

MANUFACTURING CO., 0F CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS RADIO TUNING MECHANISM Application filed October 11, 1930. Serial No. 488,134.

My invention relates to radio-tuning mechanism of the type comprising a manually-operative dial-equipped disk disposed parallel with the front panel of the casing of the radio-receiving apparatus and directly connected with the condenser, or condensers, ork

the like mechanism.

One of my objects is to provide such a disk which may be readily and conveniently manually operated; which will be smooth and positive in operation and by which the desired delicate adjustment of the structure operated thereby may be effected without back lash or lost motion.

Another object is to provide such a construction whieh will be of pleasing appearance, economical of construction and may be easily and economically assembled with the other parts of the radio-receiving apparatus; and other objects as will be manifest from the following description.

Referring to the accompanying drawings:

Figure 1 is a face view of the dial-equipped disk of radio tuning mechanism together with an escutcheon associated therewith and constituting an embodiment of my invention.

Figure 2 is a rear view of the assembled parts shown in Fig. 1; and

Figure 3, a view in vertical section of the structure shown in Figs. 1 and 2 illustrating it assembled with other parts of a radio receiving apparatus with which it cooperates.

In accordance with the preferred illustrated embodiment of my invention the structure comprises a disk 4 having its peripheral edge beaded as represented at 5 and knurled as represented at 6, the disk 4 being shown as provided with an arcuate opening 7 over which an arcuate sheet 8 of Celluloid or other material adapted fory the transmission therethrough of light, preferably translucent, extends, the sheet 8 being preferably secured to the rea-r side of the disk 4 as by rivets 9 and presenting on its front side a series of graduations 10 such as are commonacross the face of the disk 4 and by the omission of the flanges at the opposite side edges thereof presents openings through which portions of the disk extend as shown in Fig. 1 to render the disk accessible for operation either by applying hand pressure to one side edge of the disk or by simultaneously grasping the disk at its opposed exposed edge portions.

The disk 4 is preferably rearwardly offset relative to the beaded edge thereof and the escutcheon is likewise rearwardly offset as shown in Fig. 3 to cause it to conform generally in cross-sectional shape to the crosssectional shape of the disk, the escutcheon containing an arcuate opening 17 through which a portion of the dial is exposed, a pointer 18 being provided on the escutcheon he opening 17 for cooperation with the cia In Figure 3 I have shown the above described parts assembled with other parts of a radio receiving apparatus comprising a gang condenser 19 shown as supported on a sub-base 2O of a cabinet the front panel of which is represented at 21.

In this construction the panel 21, shown as formed of sheet metal but which may be of wood or any other suitable material if desired, is apertured at 22 in registration with the opening 17 in the escutcheon, and also at Y said plate being secured to said panel and extending over the face of said disk and exposk 23 for the projection therethrough of the outer end of the shaftr24 of the gang condenser 19.

In assembling the dial-disk 4 and the escutcheon 1S with the lshaft 24 and panel 21, the sleeve 11 is slipped over the end of the shaft 24 to the position shown and the set screvv 12 vtightened toV securely connect the sleeve 11 to the shaft 24. The escutcheon 13 is then applied to a position extending across the disk 4 the escutcheon 13 having a socketknob 25 rigid thereonv which has a running fit over the outer endof the shaft and serves to so position the escutcheon relative to the disk 4 that, While the escutcheon is caused to extend into close proximity to the disk 4, rubbing contact of the disk 4 With the escutcheon is positively prevented. The escutcheon thus" positioned extends at its lugs 15 flatvvise against the panel 21 to Which it may be secured in any suitable Way as for example by rivets or screw-bolts extending through the openings 16 and registering holesV in the panel.

The condenser shaft 24 is thus operated ldirectly from the disk 4 Which, by reason of its f relatively great size, permits of the accurate adjustment ofthe movable elements of the condenser Without back lash or lost motion, the exposing of a portion of the peripheral edge of the dial through an opening, and preferably through vdiametrically disposed openings atthe face of the panel, adapting the disk for ready and accurate manipulation.

having a dial portion and operatively engaging said shaft and extending crossvvise thereof7 and a plate between which and said panel said disk is located, said plate being secured `to said panel and extending over the face of said disk and exposing a portion of the periphery of said disk for the application of turning force theretoand said plate containing a socket at YWhich said plate is adapted to fit over the end of said shaft in applying the plate to position.

WINSLOW GOODWIN.

While I have illustrated and described a particular embodiment of my invention'I do not wish to be understood as intending to limit it theretoas the same may be variously gaged With said shaft, and a plate betvveen which and said panel said disk is located,

ing a portion of the periphery of said disk for the application of turning force thereto.

2. In radio receiving apparatus, the` combination ofa panel, tuning mechanism oomprising a shaft by the rotation of Which the Vtuning is Veifected and extending crossvvise of said panel, said panel containing an aperture in alinementwith said shaft anda disk

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