US1536840A - Panel mounting for variable-circuit elements - Google Patents

Description

May 5, 1925. 1,536,840

A. H. GREBE PANEL MOUNTING FOR VARIABLE CIRCUIT ELEMENTS Filed Dec. 1924 ORNEY Patented May 5, 1925.

ALFRED HENRY GREBE, OF HOLLIS, NEW YORK.

PANEL MOUNTING FOR VARIABLE-CIRCUIT ELEMENTS.

Application filed December 5, 1924. Serial No. 754,193.

To all whom 'it may concern.'

Be it known that I, ALFRED HENRY GREBE, a citizen of the United States, residing at Hollis, in the county of Queens and State of New York, have invented certain new and useful Improvements in Panel Mountings for Variable-Circuit Elements, of which the following is a specification.

My invention relates generally to panel mounting of controlling dials for condensers, inductance coils, resistances and other circuit elements of variable type and is designed to facilitate manipulation, nicety of adjustment, etc., and, at the same time, improve the appearance of the panel, by relieving it of the conventional full-face display of numerous dials of various shapes and sizes.

The invention has particular reference to the panel mounting of main co-ntrolling dials, having arranged in cooperative relation therewith, Vernier attachments, the function and operation of which are Welllrnown in the art.

The novelty of the present invention lies broadly in mounting both the main and Vernier dials in the rear of the panel, preferably at right angles to the plane thereof, and, thus arranged, they are concealed from view, excepting a small peripheral section of each dial, which projects through a conforming slot in the panel, presenting what is termed a tangent wheel adjustment.

In the accompanying drawings, I have illustrated a construction suitable for carrying my invention into effect, but I do not wish to be understood as limiting myself to the same, as various changes may be made the-rein without departing from the spirit and scope of the invention.

In the drawings- Fig. l is sectional view taken transversely of a panel, showing main and Vernier dials,

mounted in the rear of the panel in accord-V ance with my invention to control the variame member of a circuit element, such as a condenser or other unit;

ig. 2 is a vertical sectional View taken on the line 2, 2, of Fig. 1, and

Fig. 3 is a horizontal section taken on the line 3, 3, of Fig. 2.

Referring now to the drawings, 1 may represent the panel of a radio receiving set, for example, and 2, a variable condenser or other circuit element or unit,such as an inductance, a resistance or the like, suitably mounted in or on the rear of the panel and having the movable member thereof carried by a shaft 3.

As shown, the adjustment of the movable member of the variable element is cont-rplled by main and Vernier dials 4 and 5; the main dial being mounted on the shaft and the vernier dial on a second parallel shaft ti. carrying at its upper end a friction pinion 7, of any suitable form, which o"- gijages the wall 8, of an annular groove 9. in the under face of the main dial 4. The Vernier dial shaft tn rns in slotted bearings 10, 10, formed in the frame 11 of the circuit ele-ment 2, and is yieldingly held in close fric/tional contact with the groove of the main dial by a spring 12. y

Mounted as above described, segments of the main and the vernier dials project through slots 13 and 13a, in the panel, which slots, by means of integral or attached facings 14 are extended to conform approximately to the projecting segments, leaving exposed only the peripheral surface of the dial segments for manipulation by the hand of the operator.

The peripheral face of the main dial contains the usual scale or degree markings from zero to one hundred, as indicated at 15, in Fig. 1, and for greater convenience of the operator, the peripheral face of the Vernier dial may be milled, toothed or otherwise roughened to insure a good finger grip for ease of manipulation.

In use, a tangent wheel adjustment is provided, either directly by the main dial or indirectly, by the Vernier dial, which, under manipulation by the finger of the operator, is effective for rotating the movable member of the variable circuit element, in either direction, throughout its range of movement and such manipulation is very materially facilitatedby the slot facings 14, which serve both as guides and guards, in locating the dials 'and providing convenient support for the operators hand.

In applying the above described construction throughout the panel of a radio receiving set, for example, the objectionable dial display, which is noticeably prominent in apparatus of this kind, is avoided and an effective adjustment, controlled to permit the smallest fraction of a turn, is made available for ready and convenient use by anyone of average ability, not specially skilled in the art. Y

Having, therefore, described my invention, what 1 claim is: ,y

1. A panel mounting for a variable circuit element, comprising two dials operatively connected to control the variable element, said dials presenting segmental portions only `for manipulation from the front of the panel. v

2. A panel mounting for a variable circuit element comprising two dials mounted in the rear of the panel and operatively connected to control' the variable element, said dials being arranged with segmental portions only available for manipulation from the front of the panel.

3. A panel mounting for a variable circuit element, comprising two dials mounted in the rear of the panel and operatively connec'ted to control the variable element, said dials being geared together and having segmental portions extending through openings in the panel.

4. A panel mounting for a variable circuit element, comprising two dials mounted in the rear. ofthe panel and operatively connected to control the variable element, Said dials being connected by reducing gearing and having segmental portions projecting through openings in the panel and means for extending the front lface of the panel to enclose substantially all of said segmental -portions excepting the peripheral surfaces thereof. n

5. A panel mounting for a variable circuit element, comprising twodials mounted in the rear of the panel and operatively connected to control the variable element, said

Images