US1453067A - Universal taper protractor - Google Patents

Description

Apr. 24, 1923.

G. H. FELsKE UNIVERSAL TAPER PROTRACTOR Filed July 26 1922 2 Sheets-Sheet l IApr. 24, 1923.

G. H. FELSKE UNIVERSAL TAPER PRomRAcToR Filed Jul 26 1922 2 Sheets-Sheet 2 ,lwe/zfo?? Patented Apr. 24, 1923.

c UNITED STATES ATENTv orrice.

GUSTAVE H. FELSKE, 0F CLEVELAND, OHIO.`

'UNIVERSAL TAPER PROTRACTOR.

Application led July 26, 1922. Serial No. 577,520.

4and useful Improvement in Universal Taper' Protractors, of which the following is a full, clear,l and exact description.

This invention relates to a universal taper 1)rotraotor adapted particularly for gauging tapered work such as may be machined in a lathe, planer or shaper, and capable of use as a convenient tool for many other opera tions.

The principal object of the invention is to get a portable taper protractor which is easily handled and adjusted, enabling the workman to readily set the same for any taper and to machine a work piece with precision on the desired taper.

.The above object is attained by the present invention which'may be briefly summarized as consisting in certain novel details of construction, and combinations and arrangements of parts which will be described in the specification and set forth in the appended claims.

In the accompanying sheets of drawings, Fig. 1 is a top plan view of the device; Figs. 2, 3, 4 and 5 aresectional views substantially along the llines 22, 3-43, 4 4 and 5-5 of Fig. 1, looking in the directions indicated by the arrows; Fig.r 6 is a side View of the same on a slightly reduced scale; and Figs. 7 and 8 are views similar to Fig. 1, showing how the protractor and the rotary blade may be shifted to various positions to permit vari ous measuring operations to be performed.

The device formed in accordance with my invention includes a portable holder 1() which is preferably substantially U-shape as best shown in Fig. 6. At one end of this holder there is a stationary head 11, with a jaw which receives a normally stationary scale or straight edge 12, which for convenience may be referred to as a blade. The word'y stationary is used as meaning-nonrotating, for the scale may be slid endwise in the jawof the head when conditions require, and to that end a suitable clamping and releasing device is provided. In this instance this is in the form of a screw 13 having a flattened shank with an upturned lip engaging in a longitudinally extending groove 12 of the blade and having a threaded portion projecting through the rear of the head and provided ywithv a tightening nut 14." With this device the scale'is always held back against the flat straight face of the jaw at right angles to the longitudinal axis ofthe device.

At the other end of the holder there is an This slide may be clamped to the guideway by suitable clampi ing means here shown as a screw having a clamping head 17 seated in a slot 18 of the slide and provided with a tightening and releasing nut 19 on the under side of the extension 15.

On the inner end of the slide 16 there is an annular protractor head 20 the inner annular surface of which receives witha close fit a graduated protractor 21 normallyheld in any given positionor angular adjustmentby a clamping screw 22. When the screw 22 is loosened the protractor may be turned to any desired position which can be accurately determined by the graduations on the pro'- tractor indicated at 21a, with the assistance of a suitable zero point indicated at 21,b on the head.

The graduated portion of the protractor is flush with the surface of the head 20, but a portion of the protractor stands up above the graduated part, and this portion is formed into a j aw 21d adapted to receive a scale7 straight edge or blade 23 which rotates with the protractor 21. The blade 23 is movable endwise in the jaw 21d precisely like the normally stationary blade 12, and like the blade 12 it may be loosened for endwise movement and clamped in any desired position against the straight back of the jaw by a nut 24 on the inner threaded part of a clamping screw 25, having a lip which engages a longitudinally extending slot of the blade as in the first instance. The screw 25 extends inwardly toward the center of the protractor, and the nut 24 is located in a central opening 21c thereof. The jaw 21d of the protractor is so formed that the lower side of the blade 23 is flush with and rides on the surfacer of/thering or protractor head 20, and the blade 23 lies in the same plane with the blade 12.

In the use of this device, and assuming that it is to be used by a machinist for gauging a tapered piece in a machine such as a lathe, the operator will suitably position the slide 16 relative to the guideway so as to bring the blade 23 the desired distance from the blade 12. He will then turn the protractor until the blade 23 is at the desired angle with respect to the blade 12, this angle being designated A in Fig. 1. If necessary, also, he will move the blades endwise through the jaws 11 and 21d respectively. The parts are then in substantially the positions indicated in Fig. 1. The operator will then gauge the work piece by grasping the U-shape holder 10, and will apply the inner edges of the blades 12 and 23 to the work piece to test the taper formed thereon.

In the event the taper is to be formed on a small piece such as on the point of a tool, it may be desirable to rotate the protractor and its blade 23 to the position shown in Fig. 8, wherein the angle A between the end of the blade 23 and the edge of the blade 12 is the angle to be given to the piece. To do this the blades will generally be moved endwise in their respective holdingl jaws from the positions that they will usually occupy when the angle A between the longitudinal edges of the blades is the angle by which the measuringor gauging is done.

Additionally by shifting the blades endwise in their respective jaws and rotating the protractor with its blade 23 to the proper position, the blades may be vutilized conveniently as a 30, or 600 angle, or any other angle, or as a square indicated in Fig. 7.

Thus it will be seen that the universal taper protractor above described can be readily handled or manipulated, and easily and quickly adjusted to adapt it Afor gauging taper pieces which are to be machined on any desired taper, or 'for the production ot any desired angle which may be advantageously used by a machinist or mechanic for many specifically different purposes.

It will be obvious therefore, that I have provided a very useful and convenient tool in the hands of machinists or mechanics.

I do not desire tor be confined to the exact details shown, but aim in my claims to cover adjusted position and said holder provided at the other end with a guideway, a slide in said guideway movable toward and from the first mentioned blade and provided with a rotary protractor and a second blade carried by said protractor and disposed opposite said first mentioned blade.

3. A taper protractor comprising a portable holder having at one end a jaw, a blade adjustable endwise in `said jaw together with means for clamping the blade in adjusted position, a slide disposed opposite said j aw and movable toward and Jfrom the-latter, a circular protractor head carriedbysaid slide, a rotary protractor seated in said head and provided with a jaw, and a blade in said second jaw adapted to be turned with the protractor and movable endwise in said jaw, there being clamping means to secure it in adjusted position.

4. A taper protractor comprising a substantially U-shape holder provided with two blades lying in the same plane and with two blade receiving parts in which the blades are movable in endwise direction andwith blade clamping means, one of said blade receiving parts being iiXed, and a slide movable toward and from said fixed blade receiving part and having a rotary protractor carrying the second blade receiving part.

5. In a taper protractor, a substantially U-shape holder having a blade receiving jaw provided with a blade, a slide oppositely disposed with respect to said blade and movable toward and from the same, means being provided for securing the slide in adjusted position, a circular protractor head carried by the slide, a rotary protractor carried by said head and provided with a jaw having a. blade adapted to co-operate with the first mentioned blade to form any desired' GUSTAVE H. FELSKE.

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