US2272002A - Average finder - Google Patents

Description

Feb* 39 B. HABER AVERAGE FINDER Filed 0G15. 2, 1940 4 Sheets-Sheet l 2 aan' /ey A nmey 'HABER AVERAGE FINDER Fled Oc'i'.. 2, 1940 fi Sheets-Sheet 2 .lllllalll'l Inventor Ua?, Sib/aka Q By Aorney Fei). 3 1942. DjB. HABER 2,272,002

AVERAGE FINDER Filed Oct. 2, 19110 4 Sheets-Sheet 5 n ,f Inventor 0 Q Q o A torney D. E. AVERAGE FINDER Feb. 39 194'??o Filed OC'E'.. 2, 1940 4 Sheeis-Shee, L

Inventor y A torney Patented Feb. 3, 1942 UNITED STATES PATENT OFFICE 2,272,002 AVERAGE FINDER Daniel Burns Haber, Mansfield, Ohio Application October 2, 1940, Serial No. 359,438

2 Claims.` (Cl. 235-61) This invention relates to a device for finding averages of grades, such as for enabling a teacherv to easily and quickly find the average of grades of the pupils in a school, the general object of the invention being to provide a disk having rows of characters thereon and an average indicator device with means for moving the indicator device step by step as the disk is rotated, the parts being so constructed and arranged that the indicator will give the average of a number of grades when the disk has been rotated in accordance with these grades,

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts to be hereinafter fully described, illustrated in the accompanying drawings and specically pointed out in the appended claims.

In describing the invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which- Figure 1 is a top plan view of the device.

Figure 2 is a fragmentary top plan view of that portion of the device which contains the average indicator member and the arcuate slots associated therewith.

Figure 3 is a fragmentary face view of the disk.

Figure 4 is a fragmentary rear View of the cover member of the device and showing the guard plate for the indicator member.

Figure 5 is a section on the line 5-5 of Figure 1.

Figure 6 is a View of the disk.

Figure 7 is a section on the line 'I-'I of Figure 1.

As shown in these views the device includes a base I and a cover member 2 which are suitably connected together to form a casing with a pivot pin 3 passing through the central portion of the casing and forming a pivot about which a disk 4 can rotate. This disk has an annular row of perforations 5 adjacent its periphery and on its upper face a plurality of radiating rows of characters 6 are printed, these characters being shown in the form of letters which include the letters A, A-, A+, B, B-, B+, and so on to the letter F with its minus and plus signs, the device shown being intended to average grades from A-lto F-, As shown in Figures 3 and 6, the characters are arranged in rows which have the inner ends tangent to an imaginary circle surrounding the center or pivotal point of the disk and concentric thereto. This arrangement of the letters or characters in straight lines radiating as tangents to a central circle enables a considerable number of characters to be placed on the disk so that a large number of grades can be averaged with a device of comparatively small size. It will, of course, be understood that other characters may be used instead of these letters or more grades can be added if desired.

This disk is also provided with a plurality of holes I, some of which will appear through the arcuate slot 8 formed in the cover member 2, this slot being concentric to the pivot 3 and these holes I are arranged in a circle the center of which is formed by the pivot 3. An arcuate slot 9 is formed at one side of the cover member 2 and will expose some of the perforations 5 of the disk and an arcuate slot I0 is formed in the cover member and will expose certain ones ofthe characters 6 on the disk, as the disk is rotated and this slot I0 will expose a character in each of the rows that are uncovered by the slot. Numbered graduations I I are placed adjacent the slot I0. The indicator device is shown at I2 and is of substantially triangular shape in cross section and is pivoted at one end to the cover member by a pivot I3 and a guard plate I4 is connected with the under face of the cover member 2 as shown in Figure 4 and the indicator device I2 operates between this guard plate and the cover member 2. At one corner the member I2 is formed with a pointer I5 which is bent twice at right angles so that it will pass vthrough the slot I0 and then has its pointed part overlie that portion of the cover member 2 above the slot I0 so as to point to the numerals of the graduations II. A hole I6 is formed in this part to expose the characters appearing through the slot IIJ on the disk 4. An upwardly extending projection I1 is formed at the inner end of the slot I0 to provide a stop for the pointed part I5, A portion of the arcuate edge of the member I2 is provided with the teeth I8, one of which will appear through the slot 9 in the cover member. The disk is formed with a mark I9 indicating the starting point.

In using the device a stylus or pointed member is passed through the slot 8 into one of the holes I of the disk 4 and the disk turned until the starting lpoint I9 appears through the slot 8, the disk being turned in an anti-clockwise direction. Then the indicator I2 is moved over to the starting point where the letter S will appear through the hole I6 if the disk has been moved to its starting position. The characters indicating the grades to be averaged are placed on the cover member adjacent the slot 9 as shown at 9 and the stylus or pointed member is placed in the highest grade of the group of grades to be averaged and the disk turned until the stylus strikes the bottom of the slot 9 and during this movement the stylus will strike a tooth I8 of the member I2 so as to move this member one step which will cause the pointer l5 to point to 1. Then the stylus is placed in the perforation 5 opposite the next grade of the group and the stylus pulled down to the bottom of the slot 9 to rotate the disk and this moves the member I2 another step and brings the pointer l5 opposite the numeral 2. This is repeated until the disk has been moved the number of grades to be averaged and when the operation is completed the average of the grades will be seen through the opening I6 of the pointer l5 of the member i2.

Assuming that the teacher desires to average grades C, D, F and B, she would place the stylus in the hole marked C at slot 9 and then she would move the stylus to the bottom of the slot which, of course, would turn the disk and at the end of the slot the stylus would strike a tooth of the member' l2 and move this one step so that the pointer would point to the graduations of the arcuate slot and then she would place the stylus in the hole marked D and pull down, then she would do the same with F and B. This Would give the average D+ which would appear through the hole in the pointer at the arcuate slot. To find the average of another series of grades the device is turned back to the starting point and the operation repeated for the desired grade. This device will quickly and accurately calculate the averages of from 2 to 24 grades. If more grades are to be averaged divide them into equal groups and then iind the average of each group and then complete the average from the averages found.

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts provided that such changes fall within the scope of the appended claims.

Having described the claimed as new is:

1. An average nder comprising a casing ininvention, what is cluding a bottom member and a top member, a disk rotatably arranged between said members and said disk having an annular row of perforations therein adjacent its periphery and the top member having an arcuate slot therein adjacent one side edge for exposing some of the perforations, said top member also having a row of characters thereon adjacent the slot, a character being opposite a perforation appearing through the slot, said top member also having an arcuate slot therein and in an upper portion thereof, one end of which is located adjacent the upper end of the first-mentioned slot with the second slot curving upwardly and inwardly toward the center of the top member, said top member having a roW of graduations thereon located slightly above the second slot and said disk having radiating rows of characters on its upper face, the second slot exposing one character of each of the rows exposed by the second slot, an indicator pivoted in the casing between the disk and the top member and having a part passing through the second slot and forming a pointer for the graduations and a part of the indicator having a hole therein for exposing the characters appearing through the second slot as the indicator' is moved, said indicator having an arcuate edge provided with teeth, one of which will appear through the first-mentioned slot, whereby when a member is introduced through the rst slot into a perforation of the disk to move the disk, said member will engage the tooth to move the indicator to a new graduation each time the disk is moved.

2. In an average finder, a casing including a top member having a pair of arcuate slots therein, a disk pivotally arranged in the casing under the top member and having an annular row of holes therein, some of which will appear through one of the slots, the top of the disk having rows of characters thereon which are arranged in straight lines radiating as tangents to a central circle on the disk, the other slot exposing one character of each of the rows exposed by the said slot, an indicator in the casing for indicating certain of the characters appearing through the said other slot and means for simultaneously moving the indicator and the disk by a member engaging the perforations appearing through the first-mentioned slot.

DANIEL BURNS HABER.

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