US2208137A - Angle divider - Google Patents

Description

M 16, 1940. A. s. MET-HG ANGLE DI VIDER Filed Oct. 26, 1939 2 M INVENTOR AdE/E Sqoh/s RAE 7'T/6 ma ATTORNEYS Patented July 16, 1940 UNITED STATES PATENT OFFECE ANGLE DIVIDER. Adele Sophie Raettig, Hoboken, N. J. Application October 26, 1939, Serial No. 301,315

Claims. (01. 33--98) This invention relates to angle dividers and, more particularly, to an instrument which may 'be used for dividing angles of various degrees into any number of predetermined parts.

5 Most angle dividers are complicated, making it diflicult for an average person to use the same to divide an angle into a given number of parts.

It is among the objects of the present invention to provide an angle divider which may be used to divide angles of various degrees into any number of pre-determined parts without resorting to mathematical tables. i

A further object of this invention is to provide an angle divider which is simple and inexpensive in construction.

Other objects will be obvious or will appear during the course of the following specification. In accomplishing the objects of the present invention, it has been found most satisfactory to provide-two side arms pivotally mounted in relation to one another, the arms being adapted to be placed on the two sides of an'angle and the pivot-point, which has a pin thereon, being adapted to be placed on the vertex of the angle. An upright bar is mounted to extend in a vertical plane to the side arm adjacent the pivot point. A slide is mounted on the upright. A plurality of bars, one end of which are pointed are pivotally mounted on a semi-circular ring which is detachably connected to the slide. The vertex point formed by this end of the bar is directly over the center of the pivot point. The opposite ends of the bars are detachably connected to spacer pieces of equal size pivotallyconnected together to be positioned between the two side arms, the number of spacer pieces used corresponding to the number of parts into which the angle is to be divided.

In using the device the slide is slid upwardly on the upright until the pointed ends of the outer spacers contact the side arms. By placing marks at the pivot point of the spacers and drawing lines from the vertex of the angle through the marks, the angle is divided into an equal number of parts.

The invention will appear more clearly from the following detailed description when taken" in conjunction with the accompanying drawing illustrating a preferred embodiment of the inventive idea.

i v In the drawing:

Figure 1 is a perspective View of the angle divider of this invention.

1 .Figure 2 is a detailed perspective view of the mounting of the bars in relation to the spacer pieces.

Figure 3 is a section along line 3-3 of Figure 2;

Figure 4 is a sectional view, taken on the line ,5

, 4-4 of Figure 1.

Like numerals refer to like parts throughout the several views.

In the embodiment of the invention shown in the drawing, this device consists of twoside arms .10 Hi and Il having enlarged heads 13 and H respectively. On the opposite end of the arm l0, preferably flush with the inner side 16 of said arm is a pin l5. Likewise a pin I1 is positioned at the end or" arm ll, preferably adjacent the l! inner side I8 thereof.

The side arms It and H are held in pivotal relation to one another and tea mounting head l2 having an extension 25, by a screw-threaded pivot pin is having a head l9a passing through 20 holes in the enlarged heads 13 and Hi. The pivot pin is has a pin point .20 projecting from the head thereof.

A guide block 2| is mounted on the extension 25 by means of a screw 25a. Pivoted to the pivot 25 -block 2i at 22 is an upright 23. A'guide 2111 on the block 2| cooperates with a slot 230: in the upright 23. A projection 24 in the upright 23 is adapted to engage a stop 240. on the pivot block 2|. The stop 24a is so positioned that when the projec- .30 tion 24 engages the same, the upright is at a angle to the plane of theside arms Ill and II. The surface 26 of a slide 21, which slide is mounted in slidable engagement with the upright 23, is in direct alignment above the pin 20. .35

A semi-circular ring 21a is pivotally and detachably mounted on the slide 21. The slide 21 is held in any given position on the upright 23 by a set screw 33. The diameter of the ring 21a traverses the inner surface 26 of the slide 21.

Pivotally mounted on the ring 21a at one end are bars 23, 29,30 and 3| oi equal length. On the opposite ends of the bars 23, 29, 33 and 3| are mounted hooks 32, 33, 34 and 35, respectively, which hooks are adapted to be connected with 45 spacers 36, 31 and 38.

The spacers 36, 31 and 38 are of substantially equal lengths. The spacers 36 and 38 have one end 39 and 40 pointed, the points beingon the longitudinal center line of said spacers, and the 50 opposite ends of said spacers are pivoted to the spacer 31, which is oval-shaped, by means of eyelets Al and 42 on the longitudinal center line of said spacers. The eyelets have small holes 43 and 44 through the centers thereof, respec- 55 thereon having eyelets 46 and 4'! rotatably mountbar 28.

tively. The distance between the point 39 and the eyelet 42,'the distance between the eyelet 42 and eyelet 4i, and the distance between the eyelet 4i and the point 40 are equal to one another.

The spacer 31 has a T-shaped mounting 45 ed in the horizontal arm of the mounting 45, the eyelet 46 being mounted directly over the hole 44 in theeyelet 4| and the eyelet 41 mounted directly over the hole 43 in the eyelet 42.

The hook 33 in the bar.29 is connected to the eyelet 41 and the hook 34 in the bar so is connected to the eyelet 46.

The spacer 3t has a mounting 48 with an extension 49, which extension is looated 'abovethe surface of the spacer a distance slightly greater. than the thickness of the side arm. Mounted in the extension 49 directly above the point 39 is a swivel 53 adapted to receive hook 32 on the The spacer 38 is similar in construction to the spacer 36 and has a mounting 5! with an extension 52 which is located above the surface of the spacer 38 a distance slightly greater than the thickness of the side arm ,I I. sion 52 directly above the point 40 mounted a swivel 53 which is adapted to receive the hook 35 in the armBi.

The tops of the extensions 49 and 52 and the top of the mounting 45 are all in the same horizontal plane.

The opposite ends of the bars 28, 29, 33 and 3| are pointed, as shown at 54, the points 54 bearing against the surface 23 of the slide 21. The apparatus describedherein is to be used for trisecting an angle. Should it be desired to divide the angle into a greater number of parts, a number of spacers, corresponding to the num-- ber of partsinto which the angle is divided, are used, which spacers would be pivotally con-f nected to the adjacent spacer and have a mounting similar to the mountings 48 and iii thereon to which an additional arm or bar might be at tached by means similar to those used for attaching bars 28, 29, and 3| to the spacers. The end spacers would be fashioned similar to spacers 36 and 38. V

In dividing an angle the pin 23 of the pivot point is placed at the vertex of an angle to be divided. The side arms It and II are moved apart until they coincide with the two side lines of the angle. In moving the side arms iii and ii apart, thesame pivot about the pivot pin i 9 moving in relation to each other and to the mounting head i2. The pins i5 and I? may be pressed into the material on which the angle is drawn in order to hold the side arms iii and II in position. The upright 23 is placed in a vertical position, the stop 24 on this member engaging the stop 24a on the block 2!. In this position the plane of the uprightmember 23 is at right anglesto the plane of the arms I0 and Ii.

When it is desired to trisect an angle, three spacer bars 36, 31 and 33 of substantially equal length are used.

The bar 28, which has a hook 372 in one end thereof is connected to the spacer 33 by placing the hook 32 in the eye of the swivel 3B. The opposite end of this arm is placed in the ring 21a. The bar 29'having a hook 33 in one end thereof is connected to the eyelet 41 by means placing the hook 33 through said eyelet.

Likewise the bar 33 is connected to the spacer other means in the holes 43 In the es:ten-.

31 by placing the hook 34 on one end thereof through the eyelet 46 on the mounting '45. The bar 3! is connected to the spacer 43 by placing the hook 35in the swivel 53. The opposite ends of the bars 28, 29, 33 and 3! are pivotally connected with the slide 21 by means of. the detachable ring 21a. The painted ends of the bars 28,

29, 33, 3! forma vertex, the 'point of which bears against the surface 26 on the slide 27.

v The slide 21 is then moved upwardly on the upright 23 drawing the spacer bars 36, 31, and

38 inwardly until the pointed ends 39 and Y of the spacers 36 and 3B engage the arms I9 and II, respectively.

The hooks, 32, 33, 34 and 35 swing in the swivel 53, eyelets 33 and 4'! and swivel 53, respectively. Marks are then made by pencil or and 44 of the eyelets 4i and 42.

Since the arms 28, 29, 33 and Si are of equal length and the holes in the eyelets 4i and 42 are on the longitudinal center line of the spacers 3B, 37 and 38 and equal distance from one an' other and from the pointed ends 39 and 40 respectively, the pointed ends also being on the longitudinal center line of said spacers, an arc is formed from the points where the pointed ends 39 and 40 engage the side arms is and i I through the center of the holes 43 and 44 eyelets 4i and 42. The two marks placed in the holes 43 and 44 will appear in this arc and divide the angle into three equal parts.

It is not my intention to *limit' the present invention to the embodiment of the invention herein described but rather to include all equivalent structures as covered by the scope of the following claims.

What is claimed is:v

1. An angle dividing instrument having two sidearms pivoted together at one end, an upright member mounted adjacent the pivot point of said twoarrns, a slide mounted on said upright, a plurality of spacers pivotally'connected to one another, the distance between said pivot points and the distance from the outer end of the-end spacers to the pivot point between said end spacers and the adjacent connecting spacer being equal, and a plurality of bars of equal length one end of said bars being nected to said spacers and the opposite end pivotally connected to said slide.

2. An angle dividing instrument. having two side arms pivoted together at one end, a block mounted adjacent the pivot point of said two arms, an upright member pivotally mounted on said block and adapted to be positioned to extend upwardly in a plane vertical to the plane of said side arms, a slide mounted on said upright, a plurality of spacers pivotally connected to one another, the distance between said pivot points and the distance from the outer end of the end spacers end spacers and the adjacent connecting spacer being equal, and a plurality of bars of equal length one end of. said bars being pivotally connected to said spacers and the opposite end pivotallv connected to said slide.

3. An angle dividing instrument having a mounting head, two side arms pivoted at one in the,

to the pivot, point between said pivotally cone said mounting head adjacent the pivot point between said two arms and said mounting head, an upright member pivotally mounted on said block and adapted to be extended upwardly in a plane vertical to the plane of said side arms, a slide mounted on said upright, a semi-circular detachable connecting means on said slide, a plurality of spacers pivotally connected to one another, the distance between said pivot points and the distance from the outer end of the end spacers to the pivot point between said end spacers and the adjacent connecting spacer being equal, and a plurality of bars of equal length, one end of said bars being pivotally connected to said spacers and the opposite end pivotally connected to said detachable connecting means on said slide and bearing against the inner surface of said slide.

4. An angle dividing instrument having a mounting head, two side arms pivoted at one end in relation to one another and to said mounting head and adapted to be placed along the two sides of an angle, a pin at the pivot point between said mounting head and said two arms adapted to be placed on the vertex of the angle, a block mounted on said mounting head adjacent the pivot point between the same and 'said two arms, an upright member pivotally mounted on said block and adapted to be extended upwardly in a plane vertical to the plane of said side arms, a slide mounted on said upright, a semi-circular detachable connecting means on said slide, a plurality of spacers pivotally connected to one another the distance between said pivot points and the distance from the outer end of the end spacers to the pivot point between said end spacers and the adjacent connecting spacer being equal, the number of spacers corresponding to the number of parts into which an angle is to be divided, and a plurality of bars of equal length, one end of said bars being pivotally mounted on said spacers, the opposite ends of said bars being pivotally connected to said detachable connecting means on said slide, said ends forming a vertex which bears against the inner surface of said slide and is positioned over said pin at the pivot point said two side arms.

5. An angle dividing instrument having a mounting head, two side arms pivoted at one end in relation to one another and to said mounting and adapted to be placed along the two arms, a swivel-eye on said mountings directly above the point on the outer end of said spacers, a T-shaped mounting on the inner spacer, swivel-eyes each mounted on said mounting directly above the pivot point between the inner spacers and its adjacent spacer, and a plurality of bars of equal length, one end of said bars having hooks therein to engage the swivel-eyes on said spacers, the opposite ends of said bars being pivotally connected to said detachable connecting means on saidslide, said ends forming a vertex which bears against the inner surface of said slide and is positioned over said pin at the pivot point between said two side arms.

ADELE SOPHIE RAE'I'I'IG.

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