US1914034A - Mechanical calculating device - Google Patents

Description

June 13, 1933.- F. E. MINER 1,914,034

MECHANICAL CALCULATING DEVICE Filed June 30. 1952 Patented June 13, 1933 PATENT OFFICE FLOYD E. MINER, OF CHICAGO; ILLINOIS MECHANICAL CALCULATING DEVICE Application filed June 30,

My invention relates to a mechanical device adapted for use in arithmetical calculations. I p

An object of the invention is to provide a small, compact and simpledevice providing a large range of calculations. p

Other objects include the provision of a device having few parts, one which is durable in construction and which is particularly adapted to facilitate the accurate proportionalcalculations throughout the'scale.

Further objects will appear hereinafter by means of the device disclosed in the drawing forming a part of the specification; and in which; V

Figure 1 is a top plan view of the device having ascale thereon.

Fig. 2 is a partialsectional viewtaken on the line 2-2 of Fig. 1. k V Figs. 3 and 4 are detail perspective views of the indicator arms supports. Referring to the drawing, the base or surface of the device is; designated as 10, being relatively flat and which may be of any desiredfshapc,but for ease of handling I prefer to make it aldisc as shown. Aspiral scale 11 is arranged on the surface of the base 10 extending from near its middle portion to the outer periphery. The scale may be graduated on thesurface by means of etching or by placingaprinted formthereon which may be glued or otherwise secured.

A pinion 12 is provided witha reduced shank portion 13'adapted to extend into a hole 14; centrally of the base 10 and is riveted to be rigidly held thereto with the toothed portion of the pinion. extending vertically above thebase. I

. The pitch circumference ofthe pinion 12 must be the same as that of the lead of the spiral scale 11, so that a rack in mesh with the pinion and rotated one full turn will have one of its ends following the spiral lead one full turn. f

- ment with the pinion 12 and slidably mount- 1932. Serial No. 620,137.

ed insupporting members 20 and 21 respectively. I

Supporting members 20 and 21 are disclike members provided with a central bore 20a and 21a respectively adapted to snugly fit in turning relation on'the pinion 12. The supporting members '20 and 21 have slots 20?) and 21b milled transversely of the bores 20a and 20?) into whichthe indicators'or racks 15 and 16 are slidably mounted and guided 69 in meshing engagement with the pinion 12.

These supporting members having their bearing surface on the teeth of the pinion, are mounted with their milled slots 20?) and 21b in face to face relation, with the racks in the mill-slots and in mesh with the pinion.

At its upper end the pinion 12 is provided with a reduced shank 13a which is riveted over a washer 23 to securely hold a flat spring 22 in place on the supporting member 21 exerting a pressure so as to frictionally hold the members 20 and 21 in contact with each other. A washer 19 is fitted over the pinion and rests on the base 10 on which the supporting member 20 turns to space the member from frictional contact with the base.

Each of the indicatorsloand 16 is provided at one end with pointers 15a and 16a respectively adapted to surround one side a of the numerals on the scale 11, while their other ends are provided with lugs 17 and 18 respectively, to limit the radial movement in the other direction. 2

As thus fardescribed, the device comprises a fixed scale having a pair of movable indicators or racks in meshing engagement with a pinion that is also fixed to the base.

When a predetermined ratio is desired as for example, a ratio of'two to one (as shown in Fig. 1) the arms are turned manually about the pinion until one of the pointers of the arms is moved radially and comes into contact with one of the supporting members, which will limit its inward movement, causing the pointer to stop at 100 on the scale. That arm is then held in that position while i the other arm is turned about the pinion against the frictional pressure of the spring until the numeral 200 is reached. The opera] ator may then take hold of either arm and n turn the same in a clock-wise direction about the pinion, and the two arms will turn together being frictionally held in adjusted relation, until the point is moved to the numher that has been selected to be multiplied, the arm that was at 200 will indicate the result.

While the arms are being turned about the pinion 12, they will be moved radially in fixed relation with each other as to their set angle.

With a device as above described, it is possible to multiply or divide accurately and quickly by merely adjusting and turning the arms. In dividing, the arms are adjusted in the same manner as for multiplying, the only difierence being, the arms are turned in a counter-clockwise direction.

I contemplate as being included in these improvements all such changes, variations and departures from what is thus specifically illustrated and described as fall within the scope of the appended claims.

I claim l. A device of the character described, comprising in combination a base having a spiral scale thereon, a pinion in fixed relation to the base and axially of the spiral scale, a pair of elongated indicators each having rack teeth thereon, said teeth being constantly in mesh with said pinion, said indicators being mounted to swing about the axis of the spiral scale and also with respect to each other while swinging about said axis, the indicators respectively being mounted to slide inward and outward radially under the influence of the pinion when the indicators are axially turned.

2. A device of the character described, comprising in combination a base having a spiral scale arranged thereon, a pinion in fixed relation to the base and axially of the spiral scale, a pair of elongated indicators each having rack teeth thereon and being constantly in mesh with the fixed pinion, supporting means surrounding said pinion to guide each indicator, said indicators being movable independently with respect to each other in the support while in mesh with said fixed pinion.

3. A device of the class described, comprising in combination a base having a spiral scale arranged thereon. a pinion fixed to said base and axially of said spiral scale, a pair ot relatively long racks overlying said scale an d in mesh with the pinion, means surrounding said pinion whereby one of said racks is connected to turn around the pinion and to carry the other rack with it, said racks moving radially while in their turning move ment.

4-. A calculating device comprising a base having a spiral scale arranged thereon, a pinion fixed to said base axially of said spiral sale, a pair of relatively long racks overlying each other and in constant mesh with the fixed pinion, said racks being movable axially with respect to each other and also being mounted for radial movements, guide means pivoted to said pinion whereby said racks are guided for radial and axial movements.

5. A. calculating device comprising a base having a spiral scale arranged thereon, a pinion fixed to said base axially of said spiral scale, a pair of indicators having rack teeth thereon and being constantly in mesh with said fixed pinion, said indicators being movable around the fixed pinion for radial adjustment of said indicators, and supporting means for each of the indicators whereby one of said indicators is moved independently of the other.

6. A calculating device comprising a base having a spiral scale arranged thereon, a pinion fixed to said base axially of said spiral scale, a pair of indicators having rack teeth hereon and being constantly in mesh with said fixed pinion, said indicators being movable around said fixed pinion for radial adjustment of said indicators, supporting means for each of said indicators, and tension means coacting with said supporting means for normally holding them together.

7 A calculating device comprising in combination a base, a spiral scale carried by the base, a pinion in fixed relation to the base axially of the spiral scale, the pitch circumference of the pinion being equal to the lead of the spiral scale, a plurality of indicator arms having rack teeth thereon and severally in mesh with the pinion, the indicators being mounted to swing around the pinion on the pitch circumference thereof, each indicator arm having a pointer at one end thereof registering in the spiral lead, means for maintaining the indicator arms respectively in their operating position, tensioning means for holding the arms vieldably in given relation to each other, and stop means at the ends of said arms respectively for limiting their radial movements.

8. A calculating device comprising in combin ation a base having a spiral mathematical computation scale thereon, a pinion having its pitch circumference equal to the lead of the spiral scale andin fixedrelationtothebase and axially central of the scale, a pair of indicator arms having pointers at one end thereof and rack teeth extending their entire length and in mesh with the pinion, the indicators being mounted to swing about the pitch circumference of the pinion, stops at the free ends of said indicator arms to limit theirextreme outward movements respectively, means for maintaining the indicator arms respectively in their operative positions, and tension means coacting with said maintaining means whereby the indicator arms may swing on and around the pinion.

9. A calculating device comprising in combination a base having a spiral mathematical computation scale thereon, a pinion having its pitch circumference equal to the lead of the spiral scale, a plurality of indicator arms having rack teeth thereon and severally in mesh with the pinion, the indicators being mounted to swing around the pinion on the pitch circumference thereof, each indicator a arm having a pointer at one end thereof registering in the spiral lead, means for supporting and guiding each indicator arm in its operative position, and tensioning means for holding the indicator arms yieldably in given adjusted relation to each other Whereby the indicators are movable with each other 15 and also independently movable of each other While in mesh with the fixed pinion.

In testimony whereof I have signed this specification.

' FLOYD E. MINER.

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