US2165416A

US2165416A - Dial mechanism

Info

Publication number: US2165416A
Application number: US208154A
Authority: US
Inventors: Simon D Rydstedt
Original assignee: Stewart Warner Corp
Current assignee: Stewart Warner Corp
Priority date: 1938-05-16
Filing date: 1938-05-16
Publication date: 1939-07-11
Anticipated expiration: 1956-07-11

Description

July 11, 1939. s. D. RYDSTEDT DIAL MECHANISM Filed May 16, 1938 3 Sheets-Sheet 1 July 11, 1939. 8.1:). RYDSTEDT DIAL MECHANISM Filed May 16, 1958 3 Sheets-Sheet 2 y 11, 1939- s. D. RYDSTEDT 2,155,416

DIAL MECHANISM Filed May 16, 1938 5 Sheets-Sheet 3 Patented July 11, 1939 UNITED smrss DIAL MECHANISM Simon D. Rydstedt, Chicago, Ill., assignor to Stewart-Warner Corporation, Chicago, 111., a v

corporation of Virginia.

Application May 16, 1938, Serial No. 208,154 10 Claims. (01. ire-124.1)

This invention relates to a new and improved dial mechanism and more particularly to a pointer or indicator mechanism especially adapted for use with radio receivers of the type having a multiplicity of tuning ranges.

It has become customary in many modern radio receivers to provide separate inductances for different tuning ranges together with switch ing means for connecting the desired inductances in circuit with the tuning means of the set. With sets of this character dials are provided having separate adjacently located scales for the several tuning ranges. It is usual with such. dials to provide a single rotating index finger with arcuate scales or a single sliding index wire with rectangular scales. These index means extend over the several scales and are confusing to the user in that they do not definitely indicate the scale in use.

It is an object of the present invention to provide a new and improved scale and indicator mechanism.

It is a further object to provide a multiple scale device having indicators only one of which is in indicating relationship with a single scale in any adjustment of the device.

It is also an object to provide mechanism of this character in which indicators not in use are hidden from view. I

It is another object to provide such dial mechanism which is automatically operable upon operation of the wave change mechanism of the Set with which it is used.

' It is an additional object to provide mechanism 01 this character adapted for use with arcuate scales or with rectilinear scales.-

It is a further object to provide mechanism of this character which is simple in design, composed of but few parts and adapted for commercial production and use.

Other and further objects will appear as the description proceeds.

I have shown certain preferred embodiments d inthe accompanying drawings, in which Figure 5 is a fragmentary section taken on line -55 of Figure 3 on an enlarged scale;

Figure 6 is a face view of a different type of dial construction;

Figure '7 is an enlarged transverse section of the form of construction shown in Figure 6;

Figure 8 is a view similar to Figure 6 and showing a modified form of construction; and.

Figure 9 is a view similar to Figure 7 showing the construction of Figure 8.

Referring first to the form of construction shown in Figures 1 to 5, inclusive, the radio chasb-ase ll has secured thereto the standards l2 and i3. These standards'support the dial mechanism including the dial plate 14 and the guideway E5. The dial plate I4 has oiiset scale bearing portions it, W and. I8, as best shown in Figure 4. The pulleys I 9 and are carried from the standards l2 and I 3 and these pulleys are provided with crank pins 2| and 22 which support a slide bar 23. The wave change mechanism is operated by knob 24. from shaft 25. This shaft 25 carries a pulley 25. The flexible cable 2'! passes about pulley 2'6 and has its ends secured to the pulleys l9 and 26. The cable is guided through eyelets Z8 and 29 and is also guided by the small idler pulley 30.

The indicator slide 3! has its upper end fitted around the guideway 15, as shown at 32 in Figure 4, and is moved along the guideway by means 1 of the cable 33. This cable 33 passes around the idler, pulley St at the right end of the chassis, as shown in Figure l, and over the idler pulleys 535i and 35 at the upper left end of the chassis. The cable 33 also passes over the idler pulley 3? at the lower left portion of the dial assembly and both ends of the cable are secured to the cable drive drum 38 at theleft of the chassis. It will be understood that the drum 38 is connected in any desired manner to the tuning= mechanism of the radio apparatus assembled on the chassis. This method of connection forms no part of the present invention and has not been shown in detail.

The indicator slide 3| carries a plurality of rotatable indicators 39, Ml and 4| which are provided with the gears 42, 43 and 44. The indicatorshave the cup-shaped portions 45, 46 and tl, each of which is provided with oppositely spaced

notches

48 and 49. The spring 50 is located adjacent the upper indicator 39 and is provided with a rounded end portion 5i adapted to selectively engage the notches Q8 and 39 on the cup 45. The. double spring 52 is provided with the oppositely extending. rounded ends 53 and 54 which are adapted to selectively engage the

notches

48 and 49 in the indicator cups 46 and 41, respectively.

The indicator rack 55 is mounted on the indicator slide 3| by means of the rivets 56 and 51. which pass through the slotted openings 58 and 59 in the rack to permit it to have a limited longitudinal movement. The toothed edge 60 of the rack engages all three of the gears 42, 43 and 44. As best shown in Figure 4, the rack 55 is provided with the rearwardly extending lugs 6! and 62 which engage opposite edges of the slide bar 23. As is clearly shown in Figure 2, the pulleys I9 and 20 carrying the slide bar 23 are located in an inclined plane parallel to the location of the bar 23 as shown in Figures 2 and 4. so that upon rotation of the pulleys the bar 23 moves upwardly and downwardly parallel to the plane of the indicator slide 3|.

Referring next to the form of construction shown in Figures 6 and 7, the circular dial 'II) is provided with a plurality of arcuate scale bearing portions H, I2 and I3 and with the central cap or cover I4. The shaft I5 is located concentrically of the dial scales in the rear thereof. This shaft will be connected in any desired manner to the movable tuning elements of the radio apparatus. The end of the shaft I5 carries the indicator arm "I6, one side of which carries the rotatable indicators TI, 78 and I9 which are provided with the gears 80, BI and 82, respectively. The other portion of the arm carries a counterweight 93. The rack 83 meshes with all of these gears. The end of the rack 83 is provided with upturned lugs 84 and 85 between which fits the end 85 of a bell crank lever 87 which is carried in the rotatable shaft 15. The other end of the bell crank 86 is connected by link 88 to the sliding member 89 which is adapted to be moved axially along the shaft I5. The member 821 has a circumferential groove 99 in which fits the actuating arm 9|. The arm BI is secured to shaft 92, which may be connected in any desired manner to means for operating the indicators. It is normally connected to the wave change mechanism of the apparatus.

The form of construction shown in Figures 8 and 9 is generally similar to that shown in Figures 6 and '7. The circular dial Iiifl is provided with the outer dial scale portion NH and with the intermediate cover portion I02. It is further pro-- vided with a double scale carrying portion I33 and a central cover portion Iii i. Separate scales will be located adjacent the opposite edges of the portion I113. The shaft I55 carries the indicator arm I55 which is counterweighted at It?. The arm I55 carries two indicators IE8 and 19 which are provided with the gears H6 and III, respectively. The rack slide I I2 meshes with both gears Hi and HI, and at its end has the lugs HE; and IM which engage the end H5 of the bell crank H5. This bell crank H6 is carried and operated in the same manner as the bell crank 87 of Figure 7.

The form of construction of Figures 1 to 5 is operated automatically by the operation of the tuning and wave change controls of the radio set in the usual manner. It will be understood that by operating the tuning control of the set the indicator slide 3| will be moved back and forth so as to be opposite the indication on the proper scale corresponding to the adjustment of the tuning elements of the radio set. In the same manner, rotation of the knob 24 to bring into operation any desired wave range will automatically move an indicator into indicating relationship with the scale corresponding to the wave band in use. The other indicators will be hidden by the scale carrying portions of the dial. Consequently the only indicator visible is that which points to the dial scale in use. This movement of the indicators is accomplished by means of the cable Z'I connected to the pulleys I9 and 20.

In the form of construction shown, there are three wave ranges provided with separate scales and indicators. It will be understood, however, that the device is capable of being used with two or more scales and indicators. With the parts in the position shown in the drawings, the intermediate scale IT is in use and the indicator 40 extends over this scale and is Visible. If the knob 2 3 is rotated in a counterclockwise direction, both pulleys I9 and 28 will be rotated in the same direction. This rotation through the crank pins III and 22 will move the slide bar 23 downwardly. L

The parts are so related in size that when the knob 24 is turned sufficiently to bring into operation the next wave band, the bar 23,Will have moved downwardly sufficiently so that the rack slide 55 by engagement with the gears 42, 43 and i i on the indicators rotate each indicator through an arc of 99 degrees. This movement will rotate the indicator 35 until it is behind the scale l6 and is not visible. The indicator 39 will be rotated but will continue invisible. The indicator lli will, by this 90 degree rotation, be brought into indicating relationship with the lower scale 52-2 and will be visible.

A clockwise rotation of the knob 24 will move the parts in the reverse direction. It will raise the slide bar 23 and this will rotate all of the indicators 90 degrees in the clockwise direction. This will move the indicator ll under the scale IE5 and the indicator M will continue to be hidden by the scale Ill. The indicator 39, however, will pass out through the space at the upper edge of the scale I5 and will be in indicating relationship with that scale. It will be seen that all of these operations are carried out automatically by merely turning the usual knob to bring into operation the desired wave range.

Referring next to the form of construction shown in Figures 6 and '7, the method of operation is generally similar to that described. The shaft 92 will be rotated when it is desired to change from one wave range to another. With the parts in the position shown in the drawings, the indicator TI is in indicating relationship with scale 73. Movement of the rack slide 83 to the left will move the indicator I'I behind the central shield iii. The indicator 19 will continue to be hidden by the scale I2. The indicator I8, however, will appear above the scale I2 and be in indicating relationship therewith. A further movement of the rack bar 83 to the left will bring the indicator I9 into indicatingrelationship with the scale lI, while the cther two indicators will be hidden.

The form of construction shown in Figures 8 and 9 is operated in the same manner as that shown in Figures 6 and '7. The difference here is that a single indicator I88 serves at different times to coact with two different scales. With the parts in the position shown in Figures 8 and 9, the indicator I838 is in indicating relationship with the scale I E! I. With the rack slide I I2 moved to the left the indicator Hi3 will be hidden by the cover portion I02, while the indicator I I I will appear above the inner scale on the scale portion I03. With the rack slide I I2 given further movement to the left, the indicator I09 will again be hidden by the central cover I04. The indicator I08 will now have been moved through a total of 180 degrees and will appear above the outer scale upon the scale portion I03.

While I have shown and described certain preferred forms of my invention, these are to be understood to be illustrative only. While my invention has been described in connection with a radio receiver it may also be used with other apparatus such as transmitters, test instruments and the like. I contemplate such changes and modifications as come within the spirit and scope of the appended claims.

I claim:

1. Radio dial mechanism comprising a plurality of spaced index scales, a plurality of indicators rotatably mounted adjacent the scales, and means for rotating an indicator into and out of position above a scale and in indicating relationship therewith. J

2. Radio dial mechanism comprising a plurality of spaced index scales, a plurality of indicators rotatably mounted adjacent the scales,and joint operating means for rotating an indicator into position above a scale and in indicating relationship therewith and for rotating another indicator into position below a scale whereby the indicator is hidden by the scale.

3. Radio dial mechanism comprising a plurality of index scales, a plurality of pivots adjacent said scales, a plurality of rotatable indicators, one mounted upon each pivot and means for jointly rotating the indicators, the indicators being interconnected whereby such rotation brings one indicator at a time into indicating relationship with a scale.

4. Radio dial mechanism comprising, in combination, a plurality of index scales, a multiple indicator unit carrying a plurality of rotatable index pointers, means for moving the indicator unit relative to the index scales, and means for rotatingthe index pointers to bring one pointer at a time selectively in registration with a scale.

5. In radio apparatus, in combination a wave change device including a rotatable shaft, a dial mechanism comprising a plurality of index scales, a plurality of rotatable indicators, a gear on each indicator, a rack engaging said gears for moving the indicators into and out of indicating relationship to the scales, and means operatively connecting the rotatable wave change shaft and the rack whereby upon wave change adjustment an indicator is in indicating relationship to the corresponding scale.

6. In radio apparatus, in combination, a wave change device including a rotatable shaft, a dial mechanism comprising a plurality of index scales, a plurality of rotatable indicators, a gear on each indicator, a rack engaging said gears for moving the indicators into and out of indicating relationship to the scales, a slide engaging the rack, spaced pulleys carrying crank pins supporting the ends of the slide, and flexible means connecting the pulleys and the rotatable wave change shaft whereby upon wave change adjustment an indicator is brought into indicating relationship with the corresponding scale.

'7. In radio apparatus, in combination, a wave change device including a rotatable shaft, a dial mechanism comprising a plurality of index scales, a plurality of rotatable indicators, a gear on each indicator, a rack engaging said gears for moving the indicators into and out of indicating relationship to the scales, a bell crank having one arm engaging the rack and link, and slide mechanism operatively connecting the bell crank and the rotatable Wave change shaft whereby-upon Wave change adjustment an indicator is brought into indicating relationship with the corresponding scale.

8. In radio apparatus, in combination a wave change device including a movable shaft, a plurality of concentric arcuate scales having spaces adjacent their edges, a rotatable shaft concentric with the scales, indicator mechanism rotated by the shaft comprising a plurality of indicators, and a sliding rack for rotating the indicators into and out of indicating relationship to the scales through the spaces adjacent the scales, the indicators not in such relationship being behind the scales, and means carried in part by the concentric shaft operatively connecting the sliding rack and the movable wave change shaft whereby upon wave change adjustment an indicator is brought into indicating relationship with the corresponding scale.

9. In radio apparatus, in combination a wave change device including a movable shaft, a plurality of parallel elongated scales having spaces adjacent their edges, a guideway parallel to the scales, an indicator slide movable along the guideway, a plurality of movable indicators carried by the slide, and means operatively connecting the movable shaft and the movable indicators for moving the indicators selectively into indicating relationship with the scales whereby upon wave change adjustment an indicator is brought into indicating relationship with the corresponding scale.

10. In radio apparatus, in combination a wave change device including a movable shaft, a plurality of parallel elongated scales having spaces adjacent their edges, a guideway parallel to the scales, an indicator slide movable along the guideway, standards supporting the ends of the scales and guideway, pulleys carried upon the standards adjacent the ends of the guideway, crank pins, on the pulleys, a slide bar carried by the crank pins and extending parallel to the guideway, a plurality of rotatable indicators carried by the indicator slide, gears on the indicators, a rack carried by the indicator slide and engaging the gears, means connecting the rack and the slide bar whereby movement of the slide bar moves the rack, and flexible means connecting the movable wave change shaft and the pulleys whereby upon wave change adjustment the pulleys are rotated, the slide bar and rack moved and the indicators rotated to bring an indicator into indicating relationship with the corresponding scale.

SIMON D. RYDSTEDT.