Historical Document · 1926
Hook's patent for the Lightning Adding Machine, filed 17 February 1921 and granted 23 February 1926: the actuators, numeral wheels, long carry tooth and weighted pawls of the stylus dial adder. The Dial-Adders theory volume uses its part numbers.
Feb. 23, 1926. R. W. HOOK 1,574,249 ADDING MACHINE Filed Feb. 17, 1921 10 INVENTOR. AT TORNEY. Patented Feb. 23, 1926. 1,574,249 UNITED STATES PATENT of FICE. RUSSELL WALLACE HOOK, OF GERAND RAPIDS, MICHIGAN. ADDING MACHINE. Application filed February 17, 1921. Serial No. 445,581. edge of the base is formed with pairs of To all whomo, é? ??? ???cern: slots 9 and the tongues 10 between them are Be it known that I, RUSSELL WALLACE bumped up as shown in Fig. 3. Each pawl 6) Hook, a citizen of the United States, and consists of a clip, a spring and a head inte residing at Grand Rapids, in the county of gral with each The clip embodies Kent and State of Michigan, have invented a plate 12 whichother. lies flat against the tongue a new and Improved Adding Machine, of 10, a pair of wings 13 which extend through which the following is a specification. the slots 9 and then lie fat This invention relates to that type of add against the base, and a fingeroutwardly 14 whose ing machines in which the numeral-bearing. 15 extends down into a hole 16 therefor. tip As O wheels are mounted on parallel axes, and its the wings engage the ends of the slots 9, object is to provide means to prevent the they and the finger 14 position the pawl. overthrow of these wheels when actuated in The spring 17 extends from the outer edge the usual operation of the machine. of the plate 12 to the head which comprises In the accompanying drawing, Fig. 1 is two plates 18 with the bearing strip 19 be a plan of one end of my improved adding tween them, and the angular portion 20 of machine. Fig. 2 is a plan thereof when the this head is so proportioned that when it is top of the case is removed. Figs. 3 and 4 in engagement with two pins 6, a numeral 5 are sections on the lines 3-3 and 4-4 of on the wheel registers the reading open Fig. 2. Fig. 5 is a plan of a numeral-bear ing 21 in the top coverwith 22 of the case. Fur 20 ing wheel and a pawl in engagement there thermore, the ? from point 23 with showing this pawl at the outward limit of this angular portion to thethe corner 24 is of its movement. Fig. 6 is a section on the such that when a pin 6 engages this point line 6-6 of Fig. 4 on a larger scale. Fig. 23 the corner 24 is separated from the upper 80 7 is a perspective of a pawl on a larger scale. edge 25 of the case by the least practical dis Fig. 8 is a bottom plan of a fragment of the tance, as shown in Fig. 5. The outer end 26 upper edge of the base. the head drops in behind the next pin Similar reference characters refer to like of after the one which has raised the pawl and parts throughout the several views. absolutely overthrow, but these This machine embodies a case consisting pawls do notprevents prevent reverse movements of 30 of a cover and a base 1 which is in the form the several wheels so that of a flat plate, preferably substantially rec traction may be solved. problems in sub tangular with rounded corners, and carries Forming the top 22 with down-turned 00 a series of rivets 2 which serve as shafts edges to constitute the sides of the case is for the actuating wheels 3, while a second merely a matter of choice, and the position 35 series of rivets 4 serve as shafts for the ing of a side wall 25 of the case of the ma numeral wheels 5. The base is preferably chine so that it will limit the outward move bumped up at each rivet in order to reduce ments of the weighted heads 20 of the pawls the areasin contact and to avoid projecting is a matter of importance as it prevents un 95 rivet heads. excessive movement of the pawls. As shown in Fig. 3, the numeral wheels desired 40 The principal however, is the ex are in a higher plane than the actuators 3, tension 26 at thefeature, end of the which adds being held up by the hubs 5 and they have weight and inertia at thepawl most effective 100 parallel downwardly extending pins 6 ten point and absolutely prevents overthrow of adapted to enter the notches 7 in the actu the numeral wheel. ators. The actuators are between the numeral 45 usually results by reason of wheels and each is in constant engagement theOverthrow stop pawls thrown out so far when with the numeral wheel next to the right. the wheels arebeing violently operated that the 05 Each actuator has a tooth 8 which is of such paw has no time to get back the path length that it may engage the pins 6 of the of the next projection beforeinto such projec 50 numeral wheel next to the left, but the form tion crosses the path of the engaging por and position of this tooth is such that it ex tion of the pawl. But when the weighted tends inoperatively between the pins 6 of outer end of the pawl moves into the path O the wheel next to the right. of a second projection as soon as the first principal invention is projection has moved by, the inertia of the theThe pawl which feature engagesofthethispins 6 of the numeral wheels. The upper longitudinal Wheel is not suficient to move the pavl out 2 1,574,249 of the path of this next projection. tach the pawl to the base, a resilient central The top is formed with openings 28 and portion and a head comprising parallel stop-tongues 29 extending into these open a bearing strip between them, and a 35 ings and the actuator wheels are formed plates, weight at the outer end of the pawl, said 5 with holes 30 to receive a stylus or other head normally held so that the weight actuating instrument. The lower edge of at its being outer end extends into the path of the the base 1 is also preferably formed with on said wheel. notches 33 and bumped up tongues 34 be projections 2. In an adding machine, a base, a series 40 tween them. The down-turned edges of the of actuator wheels rotatably mounted there i0 top engage the upper surface of the base on, a series of numeral wheels rotatably and are formed with fingers 35 which mounted on the base adjacent to said actua are bent down under the tongues 10 and 34 tor wheels, a series of parallel shouldered to unite the case, the tongues 10 and 34 be one for each wheel, on which said 45 ing shortened the thickness of the metal of pins, wheels are rotatably mounted, said base be ls the top to permit a smooth edge for the case. ing formed holes to receive the reduced The top heads of the rivets preferably pro ends of the with pins, a top bearing against ject above the plane of the numeral wheels the opposite endsand of the pins and spaced 5 so that there is little danger of the cover thereby from the wheels. being bent down onto the wheels as may 3. In an adding machine, a base and a 50 20 happen when these adding machines are series of numeral wheels mounted thereon, sent through the mails. each wheel being formed with a series of The form of the case and the number and evenly spaced parallel pins, a pawl for each size of the several wheels may be changed wheel comprising a spring, means to attach 55 by those skilled in the art without, depart one end of the spring to the base, and a 25 ing from the spirit of my invention as set head at the free end of the spring embody forth in the following claims. ing an angular portion adapted to enter be I clainn:--tween two adjacent pins on the wheel and a 1. In an adding machine, a base and a weight the outer end of the head adapted 80 numeral wheel pivotally mounted thereon to extendat back of the second of the two pins 30 and formed with a series of evenly spaced when the pawl is in its inner position. projections, a pawl to restrain the rotation of the wheel and consisting of a clip to at RUSSELL WALLACE HOOK.