Telephone-call toll monitor and indicator
CONVERSATION. 
     This invention relates to a telephone-call toll monitor and indicator, and particularly one which combines a toll charge accumulator with a clock device, so that one may note both the passage of time and the accumulation of charges in the course of conducting a long distance telephone converstion. 
     It is the object of the present invention to provide an electrically operated digital clock combined with a charge indicator, which is capable of being preset for an initial 3 -minute period of a telephone conversation, and which may be set for different rates per minute thereafter, depending upon the fixed initial charge of long distance calls, to which may be added the charges accumulated by the continuance of a telephone conversation. 
     It is another object of the invention to provide a rugged and reliable timing device and charge accumulator mechanism, which are mounted within a unitary housing, and which, in addition, is provided with conveniences for recording desired and useful information incidental to the telephone conversations and the charges therefor. 
    
    
     Other objects and purposes will appear from the detailed description of the invention following hereinafter, taken in conjunction with the accompanying drawings, wherein 
     FIG. 1 is a perspective view of the telephone toll monitor and charge indicator in accordance with the invention; 
     FIG. 2 is a left end view of FIG. 1; 
     FIG. 3 is a vertical sectional view along line 3--3 of FIG. 2; 
     FIG. 4 is a vertical sectional view along line 4--4 of FIG. 2; 
     FIG. 5 is a vertical sectional view along line 5--5 of FIG. 4; 
     FIG. 6 is a vertical sectional view along line 6--6 of FIG. 8; 
     FIG. 7 is a vertical sectional view along line 7--7 of FIG. 3; 
     FIG. 8 is a vertical sectional view along line 8--8 of FIG. 3; 
     FIG. 9 is a vertical sectional view along line 9--9 of FIG. 3; 
     FIG. 10 is a vertical sectional view along line 10--10 of FIG. 3; 
     FIG. 11 is a top elevational view of a portion of the housing adjacent to the toll indicator; 
     FIG. 12 is a vertical sectional view along line 12--12 of FIG. 3; 
     FIG. 13 is a vertical sectional view along line 13--13 of FIG. 12; 
     FIG. 14 is a sectional view along line 14--14 of FIG. 8; and 
     FIG. 15 is a vertical sectional view along line 15--15 of FIG. 3. 
    
    
     The telephone-call monitor and indicator in accordance with the invention as shown in broad outlines in FIGS. 1 and 2, is constituted by a housing H containing an electrically driven digital clock D and a toll-charge accumulator and indicator C, which are disposed within the housing on a common axis. The housing includes a portion P extending forwardly therefrom for providing a reel of paper, writing paraphernalia and other items which may be useful in recording and storing information relevant to the telephone conversations and the charges therefor. 
     The housing is preferably molded of high-impact molded plastic material and a plurality of openings may be provided in the top to permit the ventilation of the apparatus and the elimination of any heat generated therein. 
     The housing may assume the form of a base portion and an overlying cover portion 2 which are joined at a horizontal parting line. The base portion is constituted by a base 10 with end walls 11 and 11&#39; at the opposite ends thereof which are reenforced by a plurality of upstanding webs 12, 13, 14, 15, 16 and 18 molded integrally therewith and extending from the rear wall 4 to the intermediate front wall 5 of the base portion. Webs 22, 23, 25, 26 and 28 are molded integrally with the upper cover 2 of the housing, in mating relation with webs 12, 13, 15, 16 and 18, respectively. 
     Web 17 is mounted loosely within the housing by the provision of slots 27 and 27&#39; at the top and bottom thereof, which respectively engage lugs 19 and 19&#39; extending inwardly from the base 10 and cover portion 2, (FIGS. 3 and 9). 
     The web 14, extending upwardly from the base 10 at an intermediate length of the housing, supports an electric clock motor M by means of grommets in web 14 and screw nut and washer fasteners 61, as shown in FIGS. 3, 12 and 13. This clock mechanism may be any standardized form of electric clock operating on standard sixty cycle electric power lines. The operating stem 60 extends from the opposite sides of the clock mechanism and is designed to rotate at one revolution per hour. This clock serves to operate both the digital clock on the right side of the housing and the toll charge indicator on the left side thereof. 
     The digital clock D is provided with a setting shaft 35 which extends beyond the right end 11&#39; of the housing and which is supported within aligned semi-circular openings in the end wall portions 11&#39; and 21&#39; as well as in corresponding openings in two mating webs adjacent thereto, namely, 12, 22 and 13, 23. This shaft 35 which supports the minute drum 40 with its peripheral face 41 bearing the 60 minute indications, is capable of both longitudinal and rotary movement. When the end of the setting shaft 35 is moved to the right, the clock may be set by clutching the shaft 35 to the hollow axle 37 of the minute drum by means of a pair of radial projections 36 at the end of element 35 engaging a pair of diametrally opposed slots 38 at the end of axle 37. The movement of the setting shaft 35 to the left, effects engagement of the latter with friction clutch 61 mounted on the right end of the actuating stem 60 which, in effect, makes possible the transmission of the drive from the clock mechanism to the minute drum 40. The friction clutch may be formed of resilient fingers lying along a frusto-conical lateral surface which permits the easy disengagement of shaft 35 therefrom when it is desired to set the clock while assuring a positive drive of the latter from the motor M when the setting shaft is moved to the left. 
     At each revolution of the minute drum 40, that is, at the conclusion of every hour, the hour drum 50, which is disposed to the left of the minute drum 40, is advanced one incremental unit. This is made possible by the provision of 12 or 24 equidistantly disposed apertures 52 adjacent to the periphery of drum 50, one of which is adapted to be engaged every hour for imparting an advancing movement thereto. This movement is executed by the provision of a bifurcated spring 45, the opposite ends of which may be seated in molded seats 42 on the interior of the drum 40 and the bight 46 of which extends transversely to the plane of the arms of the spring 45 and is biased to exert pressure on the web 12,22 as the minute wheel is rotated. The mounting web is provided with an opening 47 adjacent to the periphery of the clock drums; to permit the bight 46 to extend therethrough for engagement with one of the apertures 52 to effect the advance of the hour drum 51 for one unit. The continued rotation of the minute drum 40 serves to cam out the bight 46 from the opening 52 wherein it was engaged, so that the hour hand 50 with the hour indication on the peripheral wall 51 thereof remains fixed for an hour until the bight 46 of the spring again arrives opposite the opening 47, at which time the hour drum 50 is advanced another unit. A window V is provided in the casing to permit a viewing of the hour and minute indicia on the drums of the clock. 
     In FIGS. 3 and 7 is shown the hour drum 50 provided with 24 apertures 52, to indicate the passage of the 24 hours of a day. However, similar results can be obtained when the drum is marked with a single set of numerals 1 to 12, for indicating twelve hours, which indications are repeated twice a day. 
     In order to indicate reliably the hourly indications, detent means may be provided between the supporting web 12,22 and the hollow axle of the hour drum 50 by effecting a firm yieldable retention therebetween at all times other than when movement is imparted to the hour drum. This yieldable detent means may be provided by forming a protuberance 55 at the lowermost point of the journal support for the axle of the rotary drum which may be formed with dimples or concavities at points corresponding to the hourly indications on the external face 51 of the drum. Alternatively, the detent means may be in the form of multiple protuberances on the drum with a cooperating recess in the web. 
     The electric motor M serves not only to drive the digital clock to the right thereof, but also to drive the toll or charge accumulator to the left thereof. For this purpose, the end of the actuating stem 60 opposite the one to which the friction clutch 61 is affixed, is rigidly connected to a coupling member 62 which is provided with one or more arcuate slots 63 which engage pins 64 at the right end of a rotary shaft 66 which is supported for rotation within the laterally disposed webs 15,25 and 16,26. Suitable friction reducing washers W may be inserted within the circular openings in these mating webs to reduce the frictional resistance of the rotary shaft 66. This expedient may also be used at all other points of relative movement between rotary members and fixed supports therefor. 
     The arcuate slots 63, as shown in FIG. 10, subtend an angle of 18°, which represents one-twentieth of a complete revolution of 360° and which corresponds to one-twentieth of an hour or 3 minutes, to provide an idle period between the movement of the actuating stem 60 before the coupling member 62 engages and actuates the pins 64 of the rotary shaft 66, when the trailing edges of the slots 63 come into contact with these pins. A U-shaped biasing spring 65 serves to maintain the relative positions between the pins 64 and the starting end of the radial slots 63 reliably fixed, so that the toll-charge accumulator begins operating only after the passage of the three-minute period which is covered by the toll-charge which is set into the indicator at the start of the long-distance conversation. 
     As shown in FIGS. 1, 3 and 9, the toll-charge indicator C may be composed of a pair of money indicating drums in side-by-side relation, which, in the illustrated embodiment may be a drum 100 for indicating dollars, and a drum 90 on the right thereof for indicating dime increments, with a viewing window V&#39; in the housing for viewing the accumulated amounts. The charge for the initial three minutes of conversation is pre-set into the indicator, which is thereafter driven by the timing mechanism to accumulate the cost of the telephone conversation with the passage of time, depending upon the setting of a rate indicating lever for the additional minutes of conversing. Thus, the latter charge is composited on the fixed charge for three minutes of the conversation, both of which are determined by reference to a source of information or the telephone operator. 
     As is evident, it is necessary that the toll-charge accumulator be operated at variable speeds in correspondence to the variations in the varying rates per minute as controlled by the distances between the parties to the conversation. A mechanism embodying frictional variable speed ratios is used for this purpose, as described hereinafter. 
     The rate indicating lever or member 71 is pivotally mounted within the housing at bearing seats therefor at the junction of the base 10 and rear wall of the housing (FIG. 8) and the free exposed end 70 of the lever is movable within slot 80 in the top wall of the housing, adjacent to the dime increment drum 90. A rate indicating scale 79 is provided along one edge of the opening 80 with the charge indicia noted thereon which, as indicated in FIG. 1, may range from five cents to sixty cents per minute. The lever is fitted with a spring 75 for normally extending the free end 70 outwardly, whereat may be provided a pawl 76 for engagement with the notches 77 at the edge of the slot. The end 70 may be pressed inwardly against the force of the spring 75 to permit the seating of the lever at any desired point of the slot, at the conclusion of which the pawl maintains the setting within a selected notch in fixed posittion, When the lever is in &#34;off&#34; position, an offset recess 81 at the lower end of the slot 80, serves to move the lever to the left which inactivates the mechanism until the lever is moved to one of the charge indicating positions. 
     The rate indicating lever 71 is provided with bearing supports 82 and 82&#39; extending in opposite directions from the longitudinal axis of the lever, (FIG. 8). A rotary shaft 83 extends through these bearings. A driving wheel 84 is mounted at the upper end of this shaft which is affixed thereon by means of a push-nut retainer 86, and a ring 85 of frictional material such as rubber or the like, is fitted on the periphery of the drive wheel 84. Likewise, a driven wheel 84&#39; is mounted on the opposite end of the rotary shaft 83 and is retained in place at that end of the shaft by means of a push-nut retainer 86&#39;. A ring 85&#39; of resilient material is fitted on the periphery of the driven wheel 84&#39; to assure a reliable drive of the actuating disk 90 of the toll-charge indicator. Preferably, both disks 67 and 90 are serrated or covered with a frictional material to assure driving engagement between the elements without slippage. 
     The actuating disk for the toll accumulator constitutes part of the dime interval drum of the toll-indicator which, for the sake of convenience, is subdivided into four repetitive portions of ten increments each, as shown in FIG. 9. Thus, at each one-quarter revolution of the drum 90, transfer is made to the dollar drum 100 adjacent thereto. For this purpose, the dime drum 90 is provided with a yielding bifurcated actuating spring 96, the free ends of which are seated within seats 95 formed on the interior of the drum 90, and the bight 97 of which is designed to be projected into the apertures 101 for imparting an incremental movement of the latter at each one-quarter revolution of the drum 90. In order to permit this movement to be effected in such fractional periods of the rotation of the drum 90, four equidistantly disposed openings 102 are formed in the floating web 17, which permit the projection of the bight of the spring 97 therethrough for engagement with one of the openings 101 in the dollar drum (FIGS. 3 and 9). 
     In the specific arrangement described above, the dollar drum is provided with ten openings 101 in each quadrant, so that the apparatus has sufficient capacity to indicate a telephone charge of $39.90, based upon variable charges per minute ranging from 5 cents to 60 cents, when added on to the initial toll charge for a 3 minute conversation. 
     In order to impart a reliability to the seating of the dollar wheel, detent means may be provided for the yieldable retention thereof in set position, similar to that described above in connection with the hour hand of the clock mechanism. For that purpose, a protuberance 106 may be provided on the floating web 17 which is adapted to cooperate with dimples 107 on an external part of the rotary dollar drum, which dimples correspond in positioning to the apertures 101 in the dollar wheel. 
     As shown in FIG. 3, the dime interval drum 90 is formed with a central shaft 94 terminating in a setting member 93 which extends from the end 11 of the housing. This setting shaft is biased for extended movement by means of spring 95 to extend outwardly and to permit free and unrestrained movement of the drum 90. At such time, the drums 91 and 100 are capable of rotary movement to set the dime interval and dollar drums to the cost of the initial 3 minutes of conversation. Whatever movements are imparted to the toll-charge drums for the initial cost of the 3 minute conversation are free of any effects by the time-controlled disk 67 since the rate control lever is seated in the offset notch 81, which results in a gap between disk 67 and driving wheel 84. The setting member 93 is held against spring pressure afforded by spring 95, and upon the setting of the rate indicating lever to the proper position, the member 93 is released gently, which, in effect, brings the driving and driven wheels 84 and 84&#39; into contact with the cooperating disks 67 and 90 to impart rotation from the former to the latter at varying speeds. As may be seen from FIGS. 3 and 8, the rocking of the lever 71 in an upward direction imparts a high speed to driving wheel 84, which is transmitted to the driven wheel 84&#39; at the same rate, and because the same is near the center of disk 90, imparts the greatest speed to the latter. 
     It is understood that even if more rapid speeds are desired to be imparted to the toll charge indicator, the driven wheel 84&#39; may be designed with a larger circumference in order to impart greater lineal velocities to the actuating disk 90. 
     At the conclusion of the telephone conversation, the disengagement between the disk 67 and the driving wheel 84 may be effected by separating them incidental to the lodging of the rate indicating lever within the offset notch 81 at the bottom of the opening 80 in the housing. At this time, the toll charge may be read off and noted on a web of travelling paper 110 as it passes over shelf 9 from a reel 111 to a wind-up reel 112. The housing may be formed with a front wall 6 and rearwardly disposed webs 5 which have circular bearings for the supporting mandrels of the reels. An alcove below shelf 9 may be used for the storage of pencils, cards or other writing material. 
     It is understood that changes may be made to several of the components of the assembly without departing from the spirit of the invention. For example, the detent means for the hour and dollar drums may be modified from the arrangements described above by shaping the external peripheral wall of each drum in the form of a plurality of shallow concavities or substantially flattened surfaces, against which a roller may be pressed to maintain these drums in their set positions. Also, the speed ratios of the frictional drive may be adjusted in fine increments of the 12 settings between 5 cents and 60 cents, by the interposition of washers on the drive shaft 83 at the driving and driven wheels 84 and 84&#39;.