US2430371A

US2430371A - Variable impulse transmitter

Info

Publication number: US2430371A
Application number: US650059A
Authority: US
Inventors: Charles C Smith
Original assignee: FARADAY ELECTRIC CORP
Current assignee: FARADAY ELECTRIC Corp
Priority date: 1946-02-25
Filing date: 1946-02-25
Publication date: 1947-11-04
Anticipated expiration: 1964-11-04

Description

Nov. 4, 1947.

c c. SMITH 2,430,371

VARIABLE IMPULSE TRANSMITTER Filed Feb. 25, 1946 2 Sheets-Sheet 1 7 Nov. 4, 1947. 4 c. c, sMn-H 2,430,371

VARIABLE IMPULSE TRANSMI TTER Filed Feb. 25; 1946 2 Sheets-Sheet 2 Patented Nov. 4, 1947 VARIABLE IMPULSE TRANSMITTER Charles C. Smith, Adrian, Mich, assignor to Faraday Electric Corporation, Adrian, Mich., a corporation of Michigan Application February 25, 1946, Serial No. 650,059

3 Claims. I

This invention relates to a control station of compact and simple form, which isreadily portable and which has a wide range in its selectable designations.

This invention has utility when incorporated in an electrically connected desk unit, as a switch selector and control in a variable impulse transmitter for remote devices selectively placed in circuit therewith. More especially, the disclosure is a signal means in code calling. The signal transmitted may be evidenced by visibl means, as flashes of light, or by sounds, as buzzers, bells, horns, chime and the like. In the embodiment, the signals may be construed as somewhatanal- Screws l thru suction cups 2 (Figs. II, III, V) and the corners of a base plate 3, assemble end caps or housing members 4, 5 (Figs. I, II, III, V)

ogous to telegraphic code signaling. With the base plate A p 6, thru a Sp Referring to the drawings: tongue 'i, may pull, from remote flange end 8 Fig. I is a plan view, with portions broken having engagement with the rorwardunder s de away, of an embodiment of th invention as a of the plate 3, a ma or medial housingsection code-signalling unit of small dimension, which 9, t Position to Overlap the respectlve end may be located on a desk, and which unit is operhmlsmg members able t select nd tr ns it ignals; Parallel arc slots In, I I (Fig. I), have teeth l3 Fig. II i a enlarged View, from the left of protruding therethru. These teeth l3 at the right Fig. I, with om parts broken away and show and protruding thru the slot in are on a selecing t t m t tive disk member l4, while the teeth I3 at the Fig. III is a view from the right, or opposit left are ona control disk member l5. The housend of the unit from the showing in Fig. II, having the motor drive and transmission shown fragmentarily;

Fig. IV is a developed or flat view of the wrap section forming the drum for th selective switch control and located medially of the unit in Fig. I;

Fig. V is a front View of the signal switch, parts being broken away;

Fig. VI is a wiring diagram of the electric circuits for the motor and signals;

Fig. VII i a side elevation, from the front of the unit, showing the barrel or cam drum, with the inner or switch control ported drum at its limit of throw to the right;

Fig. VIII is a partial View on the line VIII- VIII, Fig. VII, showing the control disk end for the barrel at off position;

Fig. IX is a partial View on the line IX-IX, Fig, VII, showing the selector disk end of the barrel, also at o position as released by the control disk;

Fig. X is a side elevation, from the front of the unit, showing the barrel or cam drum with the inner or switch control ported drum at its limit of throw to the left, or most remote from the showing in Fig. VII;

Fig. XI is a view on the line XI-XI, Fig. X, showing the control disk end for the barrel at on position;

Fig. XII is a View on the line XIIXII, Fig. X,

ing wrap or shield 9 is between the slots [0, H, and has a port or window IE to expose a selected call, as disclosed thru the window upon rotating the member M. In line with the window I6, is a shorter window or port ll for disclosing off indicator l8 (Figs. V, VII, X). Upon rotation of the control member l5, effected by the operator thru shifting the teeth l3, the off indicator I8 is brought to register with the port ll. At this position the unit is idle. Furthermore, the member I 4 is released, to permit manual selection or re-selection by the operator pushing or pulling the teeth at the right for movement along the slot In. For starting the unit, the teeth I3 at the control member 15 are shifted along the slot II to bring an on indicator I9 into register with the port [1.

The motor drive From the contact 26 there is a connection thru a line 21 to a second switch '25, 26 (Figs. II, VI, XIV). With these switches closed, the motor 24 (Figs. I, VI) is connected to operate.

The selector indicator A rim or flange 23 on the member I4 is slightly inward from the teeth I3. The rim 28 has an end lug 29 to receive an inturned end 3|] (Figs. II, VIII) of a transparency 3| (Figs. I, V) to be wrapped over a call identifying sheet 32. The sheet 32 has thereon code number designations 33 with persons or stations 34. Remote from the end 36, the sheet 3| has a similar snap-in mounting for its other end. The sheet 3| is thus in position to hold the sheet 32 in position for travel within the housing 9 past the window [6.

Setting means for the selector switch An outer drum or barrel 35 (Figs. V, VII, X) is fixed with the selector member I4. The opposite end of the drum 35 has an outward return flange 36, The inner sides of the mountings for the indicators I8, I9, coact as an outer bearing seat 31 fixed with the member I5, in which seat 31' the flange 36 rides.

A radial arm 38 (Figs. V, IX, XII) inward from the member I4 provides centering means for the drum 35 in its mounting on a shaft 33. The shaft 39 is mounted in bearing brackets 40, 4 I, rising from the base 3 (Figs. V, VII) The drum 35 has a helical slot or cam way 42 thru which extends a knob or head 43, slidably mounted on a rod 44 (Figs. II, V, VII, X, XIII) terminally fixed in the

brackets

46, 4|. This mounting fixes the rod 44 in parallel with the shaft 39. Movable with the head 43 as directed by the way 42 for shifting lengthwise of the drum 35, is a U-shaped spanner 45. The head 43 engages the medial or cross-over portion of the spanner 45, while the legs therefrom extend toward the shaft 33 to have therebetween an inner drum 46. The drum 46 of the indexing means, is freely slidable along the shaft 33, but is held from rotation relatively to the shaft 39 by a spline 41.

A locking tongue 48 enters corner end notches 43 of an indexin plate 56 (Fig. IV) in holding this plate as the cylindrical face for the inner drum 46. The ends of this plate 50, when formed into the drum 46, are slightly spaced to provide a slot (Figs. V, XIII) extending lengthwise of the drum 46. At the normal stop position for the drum 46, a downward pointed finger 52 is in approximate register to enter the slot 5|.

The finger 52 is at the free end of a switch contact arm 53. There is normal downward flexing tendency for the arm 53 toward a companion contact 54, While the pointer finger 52 may enter the narrow slot 5|, the finger 52 must come to a more wide opening in the drum 46 to allow the

contacts

53, 54 to close a circuit.

A signal circuit supply line 55 (Figs. I, V, VI) is to the

switch

53, 54. A lead 56 extends from the

switch

53, 54, to a series of remote signal means 51, the circuits from which are completed by a line 58. The opening and closing of the

switch

53, 54, is effected thru the rotation of the drum 46. The rotation of the drum 46 is not from the direct rotation of the disk I4, which only shifts the drum 46 axially, nor from the turning of the disk I5, However this latter disk I5 is effective indirectly, for it cuts in the motor 24 which has a speed reduction transmission gearing 59 to drive the shaft 39.

Control switch setting and interlock The control disk I5 is free for turning relatively to the rod 44 extending therethru, for the rod 44 as fixed by the

brackets

43, 4|, has clearance by a slot 66 in the disk I5 (Figs. II, VIII, XI). At counterclockwise limit of throw, looking from the barrel or drum side of the disk I5, the rod 44 is at the lower end of the slot 63 as a stop, and the control identification off is at the window II. There is a snap-throw of the control member l5 to this position effected thru a radial arm 6| fixed with the member l5 which is loose on the shaft 39. The free end of the arm 6| (Figs, II, V, XIV) has a grooved knob 62 for a wrap portion of an arced wire spring 63 rising from its anchor 64 in the base 3. In this limit of throw for the member |5 into the end of the slot 66, the flexed spring 63 passes a maximum fiex or intermediate dead point and snaps the member I5 to expose the off indication I8 at the window l1,

At this off position for the member I5, a cam portion 65 (Fig. II) of the arm 6| allows the flexible strip carrier for the switch contact 25 to move away from the contact 26 for this switch to be open. Lying against the free end of the strip carrying the contact 25 and on the side thereof toward the contact 26 is an arm 66 fixed on a rock shaft 61 mounted in the brackets 40, 4 I, parallel to the shaft 33, and opposite from the rod 44,

Fixed on the shaft 61 adjacent the member I4 is a pawl or stop carrying arm 68 (Figs. II, IX, )HI). At all contact or closed positions for the

switch

25, 26, the strip carrying the contact 25, lifts the arm 66 sufficiently to hold the free end of the arm 68 in engaging relation with the teeth I3 of the member l4. However, as the control I5 be rotated to off position, and there be freedom for the

switch

25, 26, to open, then the shaft 6'! is rocked to swing the arm 68 clear of the disk I 4. The disk I4 is thus released.

A window 69 (Figs. II, VIII, XI) in the member I5, just away from the control slot 60, provides ample clearance for the mounting strips carrying the

switch contacts

53, 54. These strips in their extent from inside the drum 35 thru the disk I5 are to an insulation block 10 at an inwardly offset top of the bracket 4|. The arms SI, 66, are also of insulation material.

Fixed with the shaft 33 is an insulation disk or cam II having a notch 12. This notch 12 is so angularly positioned as to the narrow slot 5| on the inner drum 46 that, as the flexible strip carrying the contact 25 rides into the cam notch I2, the pointer 52 (Figs. III, V, XIV) is at the slot 5|. This insures that no 01f throwing of the control member I5 is effective until the rotation of the inner drum be completed by the pointer 52 being in register with the slot 5|, In practice this means there may be no interruption whatsoever of any call to break into a fraction or incomplete call signal.

The interlock arises from throwing of the control member 55 to bring on I9 to the window IT. This rocking of the member I5 is reversely past the radial maximum flex region for the spring 63 and snaps the member l5 to have the rod 44 ride in the opposite or upper end of the slot 66. This swings the arm 6| (Fig. II) so that its cam 65 acts upon the flexible strip mounting the contact 25 to shift it clear of the notch 12, should it be therein. If the strip already has the contact riding on the disk 1| away from the notch 72, then this shifting of the member it to on position precludes re-entrance to the notch 12. It is accordingly seen that an interlock relation is established beyond that for off as a sequence ending stop only, but for "on to be effective at starting or curing a signaling performance. At all occasions to shift to on indication E3 to be exposed at the port i1, there is such positioning of the arms 6|, 6%, 68, that the selection member M is locked. Power current may now be effective thru the motor 24 and the transmission 59 to cause the inner drum 4'! to rotate slowly and continue so to do so long as on be the designation at the window II.

In order to cause change of designation at the window It, the operator may use his fingers to engage the exposed teeth l3 of the selector member l4. However, so long as on is at the window II, the selection may not be made. The operator must first shift the disk I 5 to bring off to the window H. The turning of th member [4 moves therewith the drum 35 and the sheets 3|, 32. The drum 46 is turned as driven by the motor 24.

Indexing for call identifications At the limit counterclockwise throwing or turning of the selector member I4, looking from the right of Fig. V, the head 43 is at the end of the helix guide 42 toward the member [4. Taking this as an initial or starting position, in order to get thereto, at the port ll, there must be shoW- ing of the off designation [8.

The plate 50 which is wrapped to form the drum 46 is provided with selector openings. The drum 46 is now in its closest position to the member l4. Opening 13 (Fig. IV) is the nearest thereto, and there may be adopted 1 to be exposed at the window l6, and with alphabetical listing, this may be F L Andrews. At each rotation of the drum 46, th pointer 52 rides once into the opening 113 for a single short electric signal to be sent. At a next position over for 2 to show at the window iii, say for D C Barker, the pointer 52 makes two quick contacts in close succession with a gap. In addition to the opening 13, the contact device 52 rides into an opening M. For three, four and five contacts, additional openings 15, i6, ii, are in the drum 46.

In order to effect the change from 1 to 2, it is necessary to shift the disk [5 from on to off. Then when the pointer 52 rides in the slot 5!, the pawl 68 is released and the disk I4 may now be moved to 2. The operator then turns the disk l5 from off to on and the two quick flashes or sounds are transmitted to the remote signals spaced by a considerable gap.

At this on position, it may be considered that the motor 24 has its speed reduction therefrom impart to the shaft 39 a speed in the range of 7 t. P. M. The provision of about 8 seconds for each revolution permits a readily noticeable gap between as many as ten contacts as quickly made during one revolution of the shaft 39. This gap determines the space or clearance between the succession of signals. Further identification aid is provided in holding the spacings between the openings 13, i4, 75, it, Tl, rather close, and a wider gap to an opening 18, with its succession of

shorte openings

13, 8!], 8!, 82. The cycles continue unless some time interval or limit be provided or there be throwing to off to open the chronous type.

6 switches 25, 26, 53, 54. The chart or index 50 (Fig. IV) is adaptable to handle 30 calls:

1-opening 13 2 I3,l4 3 "13,7 1.15 4 'i3,14,l5,16 5 13,14,15,'l6,1T 11 "18,13 12 "18,1314 13 18,13,14,75 14 'l8,|3,l4,15,16 15 l8,13,14,15,'|6,11 21 19,'l8,13 22 l9,'l8,13,'l l 23 19,'l8,l3,14,15 24 19,'l3,13,'l4,15,16 25 19,18,'l3,14,15,16,17 31 80,'!9,18,13 32 80,19,18,13,14 33 80,19,l8,13,14,15 34 80,19,18,13,14,15,16 35 80,i9,'i8,13,14,15,!6," 41 8l,8t,l'9,18,13 42 8|,8ll,'l9,18,13,14 43 8I,8t,19,'|8,13,'l4,15 44 8I,8l1,l9,18,13,14,15,16 45 8I,80,'l9,18,'l3,14,15,16,11 51 82,8l,89,19,18,13 52 82,8I,80,'l9,78,13,14- 53 82,8l,8il,19,18,13,14,15 54 82,8I,80,'|9,18,'l3,14,15,16 55 B2,8l,80,'l9,'l8,13,14,15,16,11

It is to be noted that the openings 14-, 15, 16, IT, as crosswise of the chart 50, extend lengthwise of the drum 46. The interruptions in the respective rows registe with the commencement of the

continuous openings

18, 19, 80, BI, 82, in their extent lengthwise of the drum 46, as from the right (Fig. IV). That is, the first signal after the first opening 14, is for the

openings

13, 18, with the gap greater than the l3, 14, two contact signal per cycle. With the control at off, the selector l4 may be operated to any desired first selection, as 54. As the call has been given, a desired interval, the control may be again shifted to 011" another selection made as 31 or 15, and the control member I 5 again set for on to have the signal sent out. One or more calls are completed before re-selection may be made, notwithstanding disk l5 be set to oif.

In the embodiment operating acceptably hereunder, the motor 24 is of the self-starting syn- A small space unit may be with a governed series type motor, or even of other types of appropriate dimensions.

While reference to the speed reduction of the motor 24 is suggested tobe in the range of 7 R.P.M., even with such a predetermined speed, the intermediate gearing 59 may establish a still more slow rate. Also the motor speed may not require such a slow down and still leave th signals readily distinguishable. The detectable gap at 55 is from the openings 8287. The motor itself may take care of the slow down speed sought, even with the absence of the gearing 59.

The character of the terminals is for safe electric current to be thru the unit and adequate for a signal circuit. In practice, 5 ampere current at volts has been used acceptably. However, a preferred range is not to exceed 5 ampere and the voltage not over 50. When there is a range of voltage above 50, say even up to 115 volts, 1 ampere signal current is more desirable for maintained performance.

drums responding to selector drum axially posi-v tioning the index drum as to said shaft while the index drum is held against rotation, and interconnecting means from the control as shifted to unlock the drum forcutting in the motor to retate the drum.

2. A code-calling portable unit comprising a.

base, brackets thereon, aorotatable shaft in the brackets, a slow speed motor drive for the shaft, an index drum splined. to slide along the shaft between the brackets, a manually rockable selector exterior of the index drum concentric of and movable relatively to the shaft in its extent from one bracket toward the other; a limited rock control aligned with the selector, a switch for cutting in the drive, connecting'means from the control off position to open the drive switch and including release means for th selector, an index drum responsive. switch, and connecting means from the control on position to set the release means to hold the selector and including,

8 at code starting position for the index drum, a drive switch closing for the index drum to rotate and operateits switch.

3. A unit comprising a housing, bearing means in the housing, a shaft rotatable in the bearing means, an index drum mounted on and connected to rotate with the shaft, a rotatable selector mounted on the shaft and having connection to move the drum relatively to the shaft, and a rockable controller also mounted on the shaft and movable relatively to the shaft and having engaging means operable therefrom to lock and release the selector.

CHARLES 0. SMITH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,638,417 Sperry Aug. 9, 1927 1,946,531 Haselton Feb. 13, 1934 2,061,273 Green Nov. 17, 1936 2,075,536 Miller Mar. 30,1937 2,100,390 Gofi Nov. 30, 1937 2,183,713 .Field. Dec. 19, 1939 2,247,942 Koevend' July 1, 1941 FOREIGN PATENTS Number Country Date 164,510 Great Britain June 13, 1921