US703608A - Protractor. - Google Patents

Description

Patented m I, 1902.

INVENTOR.

w k w g k v W. HUAYLE.

PROTRACTDR (Application filed Sept. 1901.

'( l|o Model.)

UNn D STATES PATENT OFFICE.

WVILLIAM QUAYLE, OF DENVER, COLORADO, ASSIGNOR TO JOSEPH H. HARRISON AND MEYER HARRISON, OF DENVER, COLORADO.

PROTRACTO R.

SPECIFICATION formingpart of Letters Patent No. 703,608, dated July 1, 1902.

Application filed September 9, 1901. Serial No. 74,861. (No model.)

To all whmn it may concern:

Be it known thatI, WILLIAM QUAYLE, a citizen of the UnitedStatesof America, residing at Denver, in the county of Arapahoe and State of Colorado, have invented certain new and useful Improvements in Protractors;

and I do declare the following to be a full, clear, and exact description of the invention,

such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

My invention relates to improvements in protractors or bevels provided with an anglemeasure and a vernier,my object being to provide an instrument of this class which shall be simple in construction, economical in cost, reliable, durable, and efficient in use; and to these ends the invention consists of the features, arrangements, and combinations hereinafter described and claimed, all of which will be fully understood by reference to the accompanying drawings, in which is illustrated an embodiment thereon. 1

In the drawings, Figure l is a top or plan view of myimproved instrument broken away intermediate its extremities for lack ofspaceon the sheet. the same. partly in horizontal section, taken on the line 00 at, Fig. 5. Fig. 4 is a similar view, the section being taken just below the washer,which Fig. 2 is a side or edge view of is cut in the preceding view. Fig. 5 is a section taken on the line 1/ U Fig. 1, the parts being shown on a larger scale.

The same reference characters indicate the same parts in all the views.

Let the numerals 5 and 5, respectively,designate the two main arms or members of the instrument. The extremity of the member 5 is provided with an opening, in which is inserted the base 6 of a screw-stud 6. This base is provided with a bottom flange 6, which is countersunk in the membero. The base 6 also passes through an opening formed in a metal plate 7, whose opposite extremity is se-. cured to the member 5 by means of suitable fastening devices 8.

Fig. 3 is a-fragmentary top View,

Projecting from the extremity of the plate 7, which is attached to the member 5 is a graduated quadrant 7 The are of this quadrant forms a part of a circle whose center is the center of the stud 6, with which the arm 5 is connected.

The quadrant projects toward and overlaps the member 5 of the device when the instrument is closed, as shown in Fig. 1 of the drawlngs.

Surrounding, the shank 6 of the stud 6 is one extremity of a bifurcated arm 9, which is made fast to the base of the stud at the top by means of screws 10 or other suitable fastening devices. To the opposite extremity of this bifurcated arm is attached a Vernier 12, which is curved to conform to the curve of the quadrant and engages or occupies a position in suitable proximity to the outer edge of the same. The Vernier lies in the same plane as the quadrant and turns with the arm 5 and the stud 6.

Located above the inner extremity of the bifurcated Vernier-arm is a washer 13,which engages the member 5 and surrounds the extremity of the arm 9. The washer is centrally recessed on the under side to make room for the protruding heads ofthe screws 10. The washer is also provided with recesses on its under side adapted to receive the respective members of the bifurcated vernier-arm,which fit the said recesses.

To the top of the stud-shank 6, which is threaded for the purpose, is applied a nut 1a, which looks the stud 6, the member 5, the Vernier-arm 9, and the washer 13 together. When the member 5is turned, all of the said parts turn with it. The stud turns in the plate 7, which is made fast to the member 5, as aforesaid.

Each member 5 and 5of the device is provided with a scale for measuring relative dimensions. I g

The arm 5 is provided with an adjustable screw-pin 15, which protrudes from its inner 9 edge and is engaged by the arm 5 when the two arms are parallel.

From the foregoing description the use of the instrument will be readily understood by those accustomed to handle instruments of its class. One of the main arms, as 5, is placed against a square or straight-edge as a base, while the arm 5 is moved outward to form any desired angle orpitch with the base, as indicated by the vernier on the scale of angles and pitches. Arms 5 and 5 are quickly adjusted when the clam ping-screw 14 is loosened and may be placed at any desired angle with respect to each other, between zero and ninety'degrees. Another feature of the device consists of a scale of roof-pitchesas one-half, one-third, one-fourth, &c.-formed upon the quadrant 7. This scale of pitches is a convenience, and the use of the instrument with reference to it is the same as heretofore described when describing the manner of measuring angles. One of the main arms being on a straigl1t-edge or base, the other is moved outward therefrom until the vernier indicates the pitch required-as one-half, onethird, one-fourth, or anyotherdesired pitchthe scale shown on the drawings ranging from one-half to one-sixth. The arm 5 and the screw-stud are clamped tightly together by the cooperation of the bottom flange 6 of the stud and the nut screwed upon the threaded shank of the stud. The flange 6 is provided with brads A, which enter counterpart recesses formed in the member 5, thus causing the two parts to move in unison.

Having thus described my invention, what I claim is- 1. The combination of two main arms or members, a plate made fast to one arm and extending therefrom, the opposite extremity of the plate being provided with an opening registering with an opening formed in the other member, a screwstud having an enlarged base inserted in the registering openings, the base of the screw-stud having a bottom flange engaging a recess formed in the member through which it passes, the plate being provided with a quadrant which extends toward the member connected with the screwstud, a vernier-arm through which the shank of the screw-stud passes, the vernier-arm being made fast to the base of said stud, the vernier being arranged in suitable proximity to the graduated edge of the quadrant, and a nut applied to the threaded shank of the stud, whereby the stud and the member through which its base passes, are clamped together for the purposeset forth.

2. The combination of two arms or members, a plate made fast to one arm and extending therefrom, the opposite extremity of the plate being provided with an opening registering with an opening formed in the other member, a screw-stud inserted in the registering openings, a vernier-arm made fast to said screw-stud, a quadrant connected with the plate, the quadrant and vernier being arranged in suitable proximity to each other; the Vernier-arm, the screw-stud and the arm through which it passes being arranged to move together when the other member or arm is relatively stationary, and suitable means for locking the parts in any desired position of adjustment.

3. The combination of two arms or members, a plate made fast to one arm and extending therefrom, the opposite extremity of the plate being provided with an opening registering with an opening formed in the other member, a screw-stud having an enlarged base inserted in the registering openings, the plate being provided with a quandrant which extends toward the member connected with the screw-stud, the base of the screw-stud having a bottom flange engaging a recess formed in the member through which it passes, a vernier-arm through which the shank of the screw-stud passes, the said arm being made fast to the base of the stud, the vernier being arranged to move around a center common to the arc of the quadrant, and arranged to travel in the plane of and in suitable proximity to the quadrant, and a nut applied to the threaded shank of the stud whereby the stud and the member through which the base passes, are clamped together for the purpose set forth.

4. In an instrument of the class described, the combination of two main arms 5 and 5, a plate made fast to the arm 5 and provided with an opening registering with the opening in the arm 5, a screw-stud inserted in the said registering openings, a vernier-arm applied to said stud and made fast thereto, a vernier attached to said arm, a quadrant connected with the plate adjacent the vernier, a washer applied to the stud above the vernier-arm, and recessed to receive the same, and a nut applied to the stud above the washer, substantially as described.

5. In an instrument of the class described, the combination of two main arms or members, a plate-made fast to one arm and extending therefrom, the opposite extremity of the plate being provided with an opening registering with an opening formed in the other member, a screw-stud having an enlarged base inserted in the registering openings, the base of the stud having a bottom flange engaging a circular recess or groove formed in the member through which it passes, the plate being provided with a quadrant which extends toward the member connected with the screw-stud, a vernier-arm through which the shank of the screw-stud passes, the said arm being made fast to the base of the stud, the vernier being arranged to travel in suitable proximity to the graduated edge of the quadrant, a washer applied to the stud above the vernier-arm, and recessed to receive the latter, and a nut applied to the stud above the washer, substantially as described.

In testimony whereof I afiix my signature in presence of two witnesses.

\VILLIAM QUAYLE.

Witnesses:

DENA NELsoN, MARY C. LAMB.

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