HAND HELD ADDING MACHINE
United States Patent 3556398
The device of the invention is a small or miniature-adding machine capable of being held in one hand and manually operable to perform computations, particularly simple addition. The device comprises two small mechanical counters of known type. The counters are coupled together to operate simultaneously. Both are provided with manual reset in the form of a reset button. A gear drive is provided operable by a manually rotatable knob with a ratio of, for example, 10 to 1. To operate the knob is rotated with the thumb until a figure appears on one counter in the amount to be added. This amount is of course put into both counters. The first counter is then manually reset to zero with the button, the added amounts remaining on the second counter until the computation is completed and then the second counter is reset to zero.
Edward St., Walsh Laac-431 7th C. W. (Los Angeles, CA)
235/117A, 235/132R, 235/144HC
G06C1/00; (IPC1-7): G06C27/00; G06F15/18
Field of Search:
Richard, Wilkinson B.
Stanley, Wal A.
Attorney, Agent or Firm:
Herzig & Walsh
Parent Case Data:
This application is a
continuation-in-part of application Ser. No. 709,106, filed
Feb. 28, 1968, now abandoned.
1. A computing device comprising a first and second mechanical counter each having manual reset means, the reset means of each counter comprising a single manually actuatable member for setting the counter to zero, means connecting the counters and providing for simultaneously applying an input number to the counters whereby after application of an input number one counter can be reset to zero with a total appearing on the other counter, said input means comprising manually operable mechanism constructed
2. A device as in claim 1 wherein the counters are mounted in a housing and said manually operable mechanism comprises a wheel for applying the input
3. A device as in claim 1 including gear drive means connecting the
4. A device as in claim 3 wherein the drive means has a gear ratio
5. A device as in claim 1 including counterdrive gears and a larger wheel
6. A device as in claim 5 including a belt coupling said drive gears and
7. A device as in claim 5 wherein said wheel is a gear meshing with said
8. A device as in claim 1 wherein set reset means is constructed to
9. A device as in claim 8 wherein the reset means are of pushbutton type.
10. A device as in claim 8 wherein said reset means embodies a clutch
11. A device as in claim 1 wherein said manually operable mechanism
12. A device as in claim 1 wherein said reset means is constructed to disconnect one counter from the manually operable mechanism during reset.
The invention relates to adding machines and in particular is a small or miniature-adding machine which can be held in one hand and manually operated by the operator's thumb. The invention is an improvement on prior U.S. Pat Nos. such as 3,160,345; 3,220,645, and 3,220,646.
There is a need for a device of this type which is small enough to be held in one hand and operated with one hand and to be carried in a person's pocket or in a purse. Such a device is very useful for persons to add up the cost of purchases in supermarkets and the like; adding up Bridge scores, and other similar purposes.
In a preferred exemplary form of the invention, as described in detail herein, the device uses a pair of small mechanical counters. Such counters are of course well-known in the art and a preferred form of counter as used herein is a type supplied by ENM Company of Chicago this being a type provided with a push button for manual reset to a zero position, and identified as Series 426. The counters might be of the type shown in U.S. Pat. No. 2,004,881.
The two counters are mounted adjacent each other in a housing. The two counters are coupled or geared together and are operable together by means of a manual knob with a suitable gear ratio so that relative small amounts can be quickly and easily put on the counters. After setting a number on the counters, after each input, one counter is set to zero with the total appearing on the other counter which can be reset to zero after completion of the computation.
The primary object of the invention is accordingly to provide a small-adding machine adapted to be held in one hand and manually operated.
A further object is to provide a device of this type utilized on commercial types of counters provided with manual reset and particularly reset of the pushbutton type.
A further object is to provide a machine of this type with positive, simple and easily operable means for inserting the amounts to be added and totalizing them.
Further objects of the invention will be apparent from the following detailed description and annexed drawings, wherein:
FIG. 1 is a perspective view illustrating the operation of the device;
FIG. 2 is a plan view of an exemplary form of the invention partly broken away;
FIG. 3 is a sectional view taken along line 3-3 of FIG. 2;
FIG. 4 is a partial view illustrating another form of drive;
FIG. 5 is a partial perspective view of one of the counters;
FIG. 6 is a sectional view along line 6-6 of FIG. 5;
FIG. 7 is a sectional view along line 7-7 of FIG. 5.
FIG. 8 is a detail view along line 8- 8 of FIG. 7.
FIG. 9 is a view of a modified form of the invention.
Referring to FIG. 1, numeral 10 designates the device which takes the form of a small case or housing of a size to be held in one hand and made of a material such as plastic. Inside of the housing are two mechanical counters 12 and 14 of known commercial type. A preferred form of counter is that referred to in the foregoing supplied by the ENM Company of Chicago identified as Series 426. Counter 12 is provided with a manual reset button for resetting to zero and designated at 20, and counter 14 has a reset button 22. By pushing these buttons, their respective counters can be reset to zero.
FIGS. 5, 6 and 7 show details of one of the counters for example the counter 14. Each of the counters embodies a frame as designated at 26 having a rectangular base part 30 and upstanding end parts one of which is shown at 32. Extending between the upstanding end parts is a shaft 34 on which are rotatable a plurality of counter wheels as designated at 36 and 38 having numbers on them from zero to nine as shown. Each counterwheel embodies an integral gear as designated at 40 as well as an integral cam part as shown at 42 having a single lobe and a slot or groove as shown at 44.
The upright members as shown at 32 each have a vertical dovetailed groove as shown at 46 and the pushbuttons as shown at 20 have vertical stems such as shown at 50 which are dovetailed to be slidable in the dovetail groove 46 as shown. As may be seen the stem 50 has an elongated slot 52 so that the stem can move vertically relative to the shaft 34 and in the slot is a coil spring 54 which normally presses the stem 50 and the pushbutton 20 upwardly.
Carry over or transfer means are provided between the counterwheels so that upon a full revolution of one counterwheel a step movement of one wheel is transferred or carried over to the next wheel. The carry over wheels are on a shaft as designated at 60 and the shaft is carried on arms as shown at 62 extending from bar member 64 which has extending trunnions as shown at 66 which are journaled in the upright member as shown at 32 at the ends of the frame 30. The shaft 60 fits through openings as shown at 70 in the vertical sliding stems such as the stem 50 as shown. Thus it may be seen that when the push button 22 is depressed the shaft 60 is forced downwardly causing the bar member 64 and its extending arms to rotate clockwise looking at FIG. 5 about the axis of the trunnions as shown at 66.
Carried on the shaft 60 are the transfer or carry over gears or gear wheels as designated at 72. These are double gears as may be seen in FIG. 5 the teeth on the left side meshing with teeth like the gear teeth 40 on the counterwheels and the teeth on the right side being engageable by a projection in the next adjacent counterwheel to the right whereby the transfer is made. This projection is designated at 76 and as may be observed it is in the form of a double projection having a slot in it into which one of the teeth of the gear 72 will fit for effecting the transfer of one count upon a complete revolution of a counterwheel, this type of structure for effecting transfer being conventional in the art and being one which is known will prevent rotation of the counterwheels except at the time of transfer. On the right-hand part of gear 72, intermediate or alternate teeth are axially of different extent. Two of the teeth of greater extend normally engage the annular shoulder on one side of the counterwheel as shown in FIG. 8 preventing rotation of the next counterwheel which the other side of the transfer gear is meshing with.
As explained, when the pushbutton 22 is depressed the shaft 60 is moved downwardly and the bar 64 rotates about the axis of the trunnions such as the trunnion 60. This action is resisted by the biasing leaf spring 80 one end of which as shown engages a part of the base of the frame 30 and the other end of which fits into a slot in a bracket 82 on the shaft 60. The transfer gears come down against leaf springs 83 which engage teeth of greater axial extent on one side of the transfer gears holding them in nonrotating condition.
Upstanding from the bar 64 are reset fingers such as finger 86 as shown in FIG. 5. At the end of the finger is a projection 90 as shown which bears against the periphery of the cam 42. In the operation on the reset when the button 22 is depressed and the bar 64 rotates as described all of the fingers such as the finger 86 bear against the periphery of their cams such as the cams 42 producing rotation of each counterwheel to a zero position at which the projection 90 falls into the slot or groove 44. Upon release of the button 22 the shaft 60 comes back into position wherein the carry over gears 72 engage the gears of their respective counter wheels.
The drive of the counter is by way of double gear 92 on the shaft 60 as may be seen in FIG. 7. The gear has two sides separated by an intermediate member and as may be seen the left side meshes with the gear 40 of the first counterwheel 36. On the shaft 34 is a larger drive gear 94 and it meshes with the right side of the double gear 92. The drive gear has a part 96 of slightly smaller diameter and in this part there is a belt groove at the bottom of which is a small gear 100 the teeth of which have been formed at the bottom of the groove to mesh with the teeth of a drive belt as designated at 102.
The other counter 12 has a similar drive gear 94a which also has a small gear 100a which meshes with toothed belt 102.
Numeral 110 designates a thumb wheel on a shaft 112 journaled in a boss 114 on the inside of the case 10. On the shaft is a gear or toothed wheel 116 which provides for a gear ratio of preferably approximately 10:1 with respect to the small gears 100 and 100a. The toothed belt 102 passes over both sides of the gear or toothed wheel 116. The belt can be simply a rubber band without teeth and without teeth at the bottom of the belt groove.
From the foregoing the operation of the device will be readily apparent to those skilled in the art. The device may be held in one hand as shown in FIG. 1 and then the wheel 110 can be spun readily with the thumb to put a number onto the counter 14 that is to be added. This number is of course also fed into the counter 12 and these numbers appear in the windows of the counter as shown in FIG. 1. The button 22 is then depressed to reset the counter 14 to zero while the counter 12 is not reset. This can be done because upon resetting, the drive gear 92 disengages from the gear 40 and of the first counterwheel. At the end of a calculation or addition of a sum the total appears on the counter 12 and it can then be removed by depressing the button 22. It will be seen that resetting one counter does not effect the other and declutches one counter from drive wheel 110.
FIG. 4 shows a modified form of the device having a toothed wheel or gear 120 which instead of driving a belt directly intermeshes with the small gears 100 and 100a. The distance between the mountings of the two counters in the case is not critical and is adaptable either for a gear or belt drive. The ratio of 10:1 between the wheel 110 and the small drive gears is desirable although this ratio is not critical.
FIG. 9 shows a modified form of the invention wherein a miniature electric motor 122 is interposed in the shaft 112' between the manual knob 110 and the drive to the counters. The motor is driven by battery 124 and manual button 126. With this arrangement larger numbers can be fed more rapidly into the first counter 14. If the counter is driven too far it can easily be run back manually by the knob 110 so that the addition of larger numbers is facilitated.
From the foregoing those skilled in the art will readily understand the nature and construction of the invention and the manner in which it achieves and realizes and the objects and advantages as set forth in the foregoing.
The foregoing disclosure is a representative of preferred forms of the invention and is to be interpreted in an illustrative rather than a limiting sense, the invention to be accorded the full scope of the claims dependent hereto.