US2519699A - Rapid calculator for use with carpenter's square - Google Patents

Rapid calculator for use with carpenter's square Download PDF

Info

Publication number
US2519699A
US2519699A US6688A US668848A US2519699A US 2519699 A US2519699 A US 2519699A US 6688 A US6688 A US 6688A US 668848 A US668848 A US 668848A US 2519699 A US2519699 A US 2519699A
Authority
US
United States
Prior art keywords
square
edge
tongue
bar
calculator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US6688A
Inventor
Walter A Peterson
Original Assignee
Walter A Peterson
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Walter A Peterson filed Critical Walter A Peterson
Priority to US6688A priority Critical patent/US2519699A/en
Application granted granted Critical
Publication of US2519699A publication Critical patent/US2519699A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06GANALOGUE COMPUTERS
    • G06G1/00Hand manipulated computing devices

Description

Aug. 22, 1950 W/. A. PETERSON v 2,519,
RAPID CALCULATORFOR USE WITH cARPEN'rEms SQUARE Filed Feb. s, 1948 y 2 Sheets-Sheet 1 Jywwwtw V Val: er FL .1 e1: ETS an Aug. 22,1950 w. A. PETERSON 2,519,699
RAPID CALCULATOR FOR USE WITH CARISENTERS SQUARE 5 Filed Feb. 6, 1948 2 Sheets-Sheet 2 Wau- ET FLPBi ars cm.
Patented Aug. 22, 1950 RAPID CALCULATOR FOR USE WITH CARPENTERS SQUARE Walter A. Peterson, King, Wis. Application February s, 1948, Serial No. 6,688
2 Claims.
a l This invention relates to a device of extremely simple construction adapted to be used with a conventional carpenters square by carpenters, painters, plasterers, lumberman, millwrights, plumbers and other tradesmen for solvin numerous mathematical problems arising in connection with their work and which willenable such problems to be solved much more rapidly than byresorting to conventional mathematical methods.
' IA further object of the invention is to provide 1 a device for the aforedescribed purposes of extremely simple construction which is capable of being economically manufactured and sold and .which willbe extremely efiicient and practical 'may be utilized for solving many of the problems for which a slide rule is usually employed thereby, when utilized in conjunction with a carpenters square, affordin a rapid calculator for use by persons not familiar with the operation of a slide rule.
Various other objects and advantages of the invention will hereinafter become more fully apparent from the following description of the drawings, illustrating a presently preferred embodiment thereof, and wherein:
Figure 1 is a top plan view of the rapid calculator' for use with a conventional carpenters square; I
Figure 2 is alongitudinal sectional view thereof taken substantially along a plane as indicated by the line 2-2 of Figure 1;
Figure 3 is a plan view showing the rapid calculator in a folded,'inoperative position;and,
Figures 4 and 5 are plan views showing the. rapid calculator in use with a conventional carpenters square.
Referring more specifically to the drawings, the novel rapid calculator attachment for use "with a carpenters square and which is desigverges in one direction toward the straight edge 9 to combine therewith to form the restricted end ll of the body 8 and which merges at its opposite end with a curved edge l2 forming the enlarged end l3 of said body 8. The body 8 is divided transversely into the end sections II and 13 along the line H! and. said sections are pivo'tally connected together by'hinges 15, only one of which'is illustrated, which are attached to the undersideof the body 8 and by means of which the section II can be readily folded under the section It and so that the body 8 will assume the appearance as seen in Figure 3. Itwill also be readily apparent that when the sections H and I3 are extended, as seen in Figures '1 and 2, their adjacent edges will abut so that said sections will be disposed in the same plane, The body 8 is provided with depending foot members I 6 adapted to engage a supporting surface'for supporting the calculator l thereon and with the body 8 elevated sufiiciently so that the hinges I5 will .be out of contact with said surface, not shown.
A bar or fence I! is disposed on the upper surface of the body section l3 and is provided with an elongated, longitudinally disposed opening 18 through which the shank of a fastening l9 loosely extends. The shank of the fastenin I9 is threaded to engage a threaded upwardly opening recess 20 in the section l3 and is provided with a wing-shaped head by means of which said fastening may be readily advanced for clamping the bar ll against the upper surface of the body section [3 or loosened to permit the bar I! to pivot and slide on the fastening l9. The bar l! is of a length substantially equal to the width of the body 8 at its widest point and is provided with a straight longitudinal edge 2| which, when disposed at a right angle to the edge 9 will extend from said edge to the opposite edge of the body 8 when said bar is clamped relatively to the body. With the bar I! thus disposed and as illustrated in Figure 1, it will be noted that the upper surface of said body is provided with a plurality of lines which radiate from the meeting point'of the edges 9 and 2| and with each of which is associated indicia describing miters of different degrees. These lines and the'associated indicia, designat- "ed generally 22 may be suitably inscribed in the upper surface of the body 8. y
The rapid calculator 1, previously described, is intended and adapted to be used in conjunction with a conventional carpenters square as seen at 23 in Figures 4 and 5 including a blade 24 which is twenty-four inches in length and a tongue 25 which is sixteen inches in length as is conventional. The tongue and blade are inscribed along their outer edges with linear measures, illustrated in inches but'commonly including fractions of an inch up to one-sixteenth inch.
Numerous mathematical problems commonly occurring in construction work and in other operations performed by tradesmen may be quickly and easily solved with the calculator i and carpenters square 23, one of which is illustrated in Figures 4 and 5 and wherein, for example, it is desired to ascertain the circumference of a circle, cylinder or tank which is six inches or feet in diameter. This result can be accomplished mathematically by multiplying the figure 6 by 3.1416 or by 122 and dividing by '7 to obtaina result which is sufiiciently close. However, by positioning the carpenters square 23 on the upper surface of the body 8 as illustrated in Figure 1 and with the fence or bar I! loosened and with the outer edge of the tongue engaging against the bar edge 2|, the carpenter's square 23 is adjusted until the straight edge 9 intersects with the graduation 7 of the tongue 25 and the graduation 22 of the blade 29 and with the square 23 thus disposed, as seen in Figure l, the fastening I9 is tightened for clamping the bar ll at this angle. Since the diameter of the tank, cylinder or circle is six, the square 23 is moved until the graduation 6 of the tongue 25 intersects with the line 9, as seen in Figure 5 and the result or circumference can then be read at the intersection point of the outer edge of the blade 24 with said line 9 and will read 18 and 1-2 inches. This position of the bar I! may likewise be utilized for obtaining the diameter or circumference of any" circle and it will be readily apparent that to obtain the diameter from the circumference the procedure is reversed and the blade 24 is adjusted so that the figure thereon representing the circumference intersects with the straight edge 9 and when thus positioned and with the tongue against the bar edge 2 I, the diameter will be indicated by the point of intersection of the outer edge of the tongue 25 with said edge 9.
To find the number of square yards in a wall,
for example, one fourteen feet wide and ten feet high, the figure 9 is employed on the tongue of the square 23 instead of the figure 7 since there are nine square feet to a square yard and the figure 14, the length of the wall is employed in lieu of the figure 22 on the blade 24 and the fence or bar I1 is then set as previously described. As the heighth of the wall is ten feet the square 23 is moved until the graduation 10 of the tongue 25 intersects the straight edge 9 and the result can then be read on the point of intersection of the outer edge of the blade 29 with the straight edge 9.
Assuming that a pulley twenty inches in diameter driving a smaller pulley by a belt connection has a speed of 13 revolutions per second and that it is desired to decrease this speed to 11 revolutions per second, the square 23 is placed on the calculator l as previously described and as illustrated in Figure 4 and with the graduation 13 of the tongue intersecting the edge 9 and the graduation 20, representing the diameter of the drive pulley being used and indicated by said graduation of the blade 24 intersecting the edge 9. With the bar I! thusangularly adjusted and clamped by the fastening 19, the square 29 is then moved until the graduation 11 of the tongue is on the straight edge 9 to indicate the desired number of revolutions and when thus disposed,
the outer edge of the blade 24 will intersect the straight edge 9 at its graduation representing 16 and inches and which is the diameter of the drive pulley required.
For solving problems in square root the figures 8 and 12 are preferably used because the diagonal of a right angle two sides of which are each 8 /2 inches or feet is 12 inches or feet, respectively and because these are constant figures most frequently used in carpentry since 112 represents the run of a rafter. Accordingly, to find the diagonal or square root of the sum of the two equal sides of a right angle the square 23 is placed as in Figure 4 but with the 8 inch graduation on the tongue intersecting the line 9 and the 12 inch graduation on the blade intersecting said line, after which the fence or bar 11 is clamped. By then adjusting the square 23 so that the figure on the tongue 25 will correspond to the length of one side of the right angle, the hypotenuse or square root of the sum of the two right angular sides thereof can be readily ascertained by reading the figure on the blade 24 at its intersection point with the edge 9.
The radial lines of the indicia 22 are utilized to obtain the cut for different miters and in employing the calculator l for this purpose, the fence or bar 17 is set as seen in Figure 1 at a right angle to the straight edge 9. It will be noted as seen in Figure 1, that the upper surface of the body 9 is inscribed with a line 29 which is disposed at right angles to the edge 9 and which meets said edge at the meeting point of the arcuate line of the indicia. 22 with said edge 9. With the bar I'I set as seen in Figure 1, if it is desired to obtain a hexagon miter the square 23 is placed. on the upper surface of the body 9 with the outer edge of the tongue 25 against the fence edge 2| and moved thereon until the graduation 12 of the blade 24 is at the intersection of the radial hexagon miter line of the indicia 22. When thus disposed the graduation 7 of the tongue 25 will align With the edge 9. By then placing the square 23 on the stock or object to be cut with the twelve inch graduation of the blade 24 and the seven inch graduation of the tongue 25 intersecting corresponding edges of said object, by cutting the object along the outer edge of the tongue 25 as thus disposed, the desired miter will be obtained. By placing the square 23 in the same manner but with the graduation 6 of the blade 24 on the pentagon line of the indicia 22, the 4 /2 inch line of the tongue will align with the edge 9 and by then applying the square, as previously described, to the stock or object, using the six inch mark on the blade and the four and a half inch mark on the tongue, the correct miter can be cut as previously described.
As previously stated, numerous other problems may be readily solved with the calculator 1 and carpenters square 23 as only a few illustrated problems have been herein described and various modifications and changes in the structure of the calculator l are likewise contemplated and may obviously be resorted to, Without departing from the spirit or scope of the invention as hereinafter defined by the appended claims,
I claim as my invention:
1. A rapid calculator attachment for use with a carpenter's square comprising a base having a substantially fiat top surface and provided with a straight edge, a bar disposed on th top surface of the base, said bar having an elongated longitudinally extending slot intermediate of its ends, a thumbscrew extending loosely through the slot and adjustably anchored in the base, said thumbscrew having a head disposed above the bar, said bar having a straight edge extending longitudinally thereof for cooperatior i fvjvith the straight v e base and adaptedg to be slidably engaged b the outer edge of the tongue of a carpenter s square and to be angularly adjusted with respectito the straight edgef of the base by the disposition of the tongue and blade of the carquare relatively to said straight edge base, the straight edge of the base being longer than either the blade or tongue of the square.'
2. A rapid calculator as in claim 1, the upper surface of said base beinginscribed with miter indicia including lines radiating from the apex of the straight edge of the base and the straight edge of said bar when said straight edges intersect at a right angle.
WALTER A. PETERSON.
REFERENCES CITED The following references are of record in the file of this patent:
US6688A 1948-02-06 1948-02-06 Rapid calculator for use with carpenter's square Expired - Lifetime US2519699A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US6688A US2519699A (en) 1948-02-06 1948-02-06 Rapid calculator for use with carpenter's square

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US6688A US2519699A (en) 1948-02-06 1948-02-06 Rapid calculator for use with carpenter's square

Publications (1)

Publication Number Publication Date
US2519699A true US2519699A (en) 1950-08-22

Family

ID=21722100

Family Applications (1)

Application Number Title Priority Date Filing Date
US6688A Expired - Lifetime US2519699A (en) 1948-02-06 1948-02-06 Rapid calculator for use with carpenter's square

Country Status (1)

Country Link
US (1) US2519699A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070056175A1 (en) * 2005-09-02 2007-03-15 Lee Robin C Bevel setter
USD767360S1 (en) 2015-05-12 2016-09-27 Lee Valley Tools Ltd. Chisel honing guide blade carrier

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US637648A (en) * 1899-02-07 1899-11-21 Robert Newall Combination-tool.
US792212A (en) * 1905-04-03 1905-06-13 Robert Heddle Protractor-gage.
US1060388A (en) * 1912-05-11 1913-04-29 John D Wall Framing attachment for carpenters' squares.
US1521980A (en) * 1923-04-30 1925-01-06 Zook Peter Waldo Carpenter's measuring tool
US1713025A (en) * 1923-05-05 1929-05-14 Jr Robert A Castleman Logarithmic and semilogarithmic coordinator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US637648A (en) * 1899-02-07 1899-11-21 Robert Newall Combination-tool.
US792212A (en) * 1905-04-03 1905-06-13 Robert Heddle Protractor-gage.
US1060388A (en) * 1912-05-11 1913-04-29 John D Wall Framing attachment for carpenters' squares.
US1521980A (en) * 1923-04-30 1925-01-06 Zook Peter Waldo Carpenter's measuring tool
US1713025A (en) * 1923-05-05 1929-05-14 Jr Robert A Castleman Logarithmic and semilogarithmic coordinator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070056175A1 (en) * 2005-09-02 2007-03-15 Lee Robin C Bevel setter
US7698827B2 (en) 2005-09-02 2010-04-20 Lee Valley Tools, Ltd. Bevel setter
USD767360S1 (en) 2015-05-12 2016-09-27 Lee Valley Tools Ltd. Chisel honing guide blade carrier

Similar Documents

Publication Publication Date Title
US3212192A (en) Measuring instrument
US2773523A (en) Guide device for portable power saws
US5170568A (en) Roofing speed square and method of use
US7228636B1 (en) Pivoting rafter square with multiple insignia
US5440818A (en) Versatile measuring device
US4420891A (en) Framing and layout square
US2502124A (en) Adjustable miter gauge for saw tables
US5539991A (en) Adjustable sheathing square
US4641435A (en) Combination square
US5778949A (en) Adjustable router
US5787599A (en) Tape measuring square and adjustable tool guide
US4761890A (en) Adjustable carpenters measuring tool
US4974306A (en) Crosscut fixture for table saw
US3991474A (en) Measurement tool
US1983516A (en) Combined protractor, bevel gauge, and mitering square
US4506451A (en) Multi-functional square and angle marking tool having extendable stops
US2504244A (en) Measuring instrument
US2519699A (en) Rapid calculator for use with carpenter's square
US2775037A (en) Carpenter's square
US4965935A (en) Tile cutting table
US2251208A (en) Combination square
US3345750A (en) Adjustable carpenter's square
US1341435A (en) Bevel-square for shipbuilding
US7174650B1 (en) Sliding ruler square
US597464A (en) g-irton