US1060466A - Dial-protractor. - Google Patents

Description

A. LELOUP.

I DIAL PEOTRAGTOR. AIPPLIOATION FILED AUG. 30, 1910.

1,060,466. Patented Apr. 29, 1913.

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Specification of Letters Patent.

application filfld August 30,.1Q10. aerial NQLEYBJ'Bz- To all whom z't may concern Be it known that I, Auous'rr. 'Ln-LoUP, a cit1zen of the French Republic, and resident of Langres, France, have invented certain new and useful Improvements in D1al-Pro-' a toothed gearing contained in a box which is made integral with one of the arms of the bevel protractor. The other arm ofthe latter when vmoved actuates the gear wheels through the instrumentality of the pivot and the angles may be read on dials'carried by certain gear wheels and which move in front of windows provided in the cover of the box.

The apparatus is utilized absolutely in the same manner as an ordinary bevel protractor, one of the branches or arms of the latter being held in contact with One ofthe sides ofthe angle to be measured while the other arm is rotated around the fulcrum or hinge of the two arms until it applies itself to the second side of the. angle. The apparatus besides may be provided with a Water level of a special construction allowing to determine any desired position with reference to the horizontal or vertical direction.

The accompanying drawing given by way of example, shows one form of embodiment of adial protractor which forms the subject matter of this invention, and in this drawing: Figure l is an elevation view of the apparatus. Fig. '2 is a top plan View of same. Fig. 3 is an elevation view with a partial section. Figs. 4 and 5 are detail views drawn at a somewhat enlargedscale showing the working of the water level? As shown in the drawings, the apparatus comprises 'a bevel protractor composed of two arms a, b hingedly connected together at one of their ends. Secured to the arm a is a box 0, which is provided with windows (1, e (Fig. 1) behind which movable dials 9,7, 2' appear which allow to read in degrees, minutes and seconds the angle formed by the arms a and b. The dials g, i are a tuated in the manner shown by Fig. 3. Thearms a and b are hingedly connected together by means of a tube or pivot member ratenteda r. 29,1913:

j which is secured thrbugh the medium of a crown and of screws on the arm b and rotates freely in the two branches of the arm or body a to both sides of which it is heldby any desirable means. This tube 7' carriesv for instance by means of a pin penetrating into a groove (not shown) a second tube 7:: on which a toothed wheel I is mounted. This toothed wheel may be secured by means of a cotter pin, for instance on a pivot P, which is made integral with a disk or cap brazed 0 meshes with a pitiion 77 mounted on a shaft g-carrying on the other side a toothed wheel 0' which is made integral with the movable dial it. The wheel i' meshes with a pinion-s carried by a shaft t which carries on the other side a toothed wheel u which meshes witha pinion '0 which is mounted as well as the movable dial 5 on a shaft w. The shafts n, g, t, w, are rotatably mounted as well as the shaft k into the box or casing c. It is clear that the toothed wheels and pinions cited above must be geared with reference to each other in a certain ratio which varies according to the degree of sensibility which it is desired to give the apparatus. If one'admits for instance that the movable dial 9 were to show the degrees, the dial it the minutes and the dial a the seconds, each subdivision of the dial 9 corresponding to one de 72. or o the dial i respectively to 6 minutes or to six seconds, it would be possible to give to the toothed wheels the following cc and each subdivision of the dial numbers of teeth: Wheel Z, teeth. Pin-' ion m, 50 teeth. Wheel 0, 100 teeth. Pinion p, 10 teeth. Wheel 7', 100 teeth. Pinion s, 10 teeth. Wheel u, 36 teeth. Pinion c; 6 teeth. It is needless to say that one might choose as well other numbers of teeth giving the same result. 7

The dial showing the seconds and even that showing the minutes might be dispensed with, the apparatus then indicating only respectively the degrees and the minutes or only the degrees and being simplified in a corresponding .manner.

One of the arms of the apparatus for instance the arm may receive a water. level'l (Figs. 4 and 5 which is formed of a glass tube bent in elongated shape and closed on fashion used in apparatuses of this kind.

When it is desired to measure an angle' with reference to the vertical direction (l ig. 4) the arm I) is applied against the object the position of which has to be determined, the level w w then indicates on the scales 2 and 2 which are graduated in opposite directions, the angle comprised between the arm 6 and the vertical line. When it is desired to determine the position of a memher with reference to the horizontal line, the function is absolutely the same and the corresponding angle is indicated by the level g -y of the same liquidmass by meansof the scales 3*, 3 which are also graduated in opposite directions.

Having now fully described my said invention, what I claim and desire to secure by Letters Patent is:

A bevel protractor comprising a body composed of spaced plates, an arm movable into the space between said lates when in inoperative position, a who ar pivot connecting said arm to the body, a casing seof gears rotatably mounted Within the easing aforesaid, dials secured to the gearing, the casing having sight openings above said dials topermit reading of the latter therethrough, and a controlling gear secured to the end of the pivot projecting into the casing, said gear being adapted to operate the train of gearing aforesaid upon movement of the arm, and a spirit level mounted in the arm and adapted to be received between the sides of the body when inan inoperative position.

, In testimony whereof I have hereunto set my hand in presence of two witnesses,

AUGUTEJLELOUP.

Witnesses:

I O. H. OLIV E E. TURANE.

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