US800257A - Compass leg and point. - Google Patents

Description

PATPNTPD SEPT. 26, 1905.

l A. P. ABBTZ. COMPASS LPG AND POINT.

APPLIGATIQNPILPD DB0. 5, 1904.

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Cowllfiss LEG. AND POINT.

Specification of Letters Pate-nt.

Patented Sept. 26, 1905.

I Application filediDeoember 5, 1904 Serial No. 235,488.

To all' whom it muy concern:

Be it known that I, ADOLPH E. ABETZ, a citizen of the United States, residing at New Britain, in the county of Hartford and State of Connecticut, have invented certain new 'and useful Improvements in Com ass Legs and `Points, ofwhich the following 1s a specilication. v

Myinvention relates to improvements in a compass leg and point; and the'main obj ect 4of myl improvement is toprovide a compassleg with a yielding point. I also adapt this point for ,useas a prickunch.

In the accompanying rawings, Figure 1 is a side elevation of my compass leg and point,

together with a compass-beam attached thereto and provided with two points. Fig. 2 is a detached plan'view of the said compassbeam and connected parts, and Fig. 3 1s an enlarged sectional elevation of the compass leg-and point without the compass-beam.

The compass-leg is formed mainly of two parts A B put together at the middle in any lproper manner-as, for eXample,-by a proj ection4 on one part that fits into asocket 5 on the other part. Both of these artsA B are bored centrally from e'nd to en and then counterbored from their meeting ends to form the enlargements'and opposing shoulders 6 '6. "The part A is for the lower or point end of the leg and is referably reduced in size and tapered at t e lower end, as shown. The part B is the handle end and is left larger and is preferably knurled or roughened for convenience of handling. The two parts A B Itogether'constitute the handle and,the centering-leg ofthe compass.

The point 7 may be of any desired form at its extreme lower end; but I have shown it in the form of a light' rick-punch. It is rovided with a body that fits the central ore of the part A, a flange or enlargement 8, and a reduced portion 9 above the said flange. A

spiral spring 10 is placed within the counterbored portion of the part A with one end resting on the flange 8 andwith'its opposite end in contact withany'suitable abutment,

whereby the spring has a constant tendency to project the point 7 from the lower end of the part A until yits rejection is limited by the flangeor stop-s oulder 8, while at' the i a rod 11, having an enlargement or flan e 12 and a pad or knob 13 lfor receiving a ight blow from the o erators hand. This hammer is placed in t e p art B with the flange 1'1 in position for engaging theshoulder 6 and with the lu per end of the spring 1() engaging the said flange, whereby the said flange serves` as the resisting abutment or sto shoulder of the spring 10 for yieldingly holging the point 7 in its lprojected position. A companioncompass eg or legs may beattached t'o this centeringcompass-leg in any ordinary and desired manner. For example, I have illustrated a compass beam or beams 14, with a springsocket 15 and clamp-screws 16, whereby the same may be slipped .upon the -cylindrical portion of the part A and clamped thereon at any desired position above the point 7. The beam or beams may be provided with any ordinary legs or points-- as, for example, the metal point 17 and pencil-holding pointhlS-adjustably mounted on gently, so as to slightly compress the spring 10, If the work is metal and it is desired to make a light, center as a mark or to support vthe point in scribing a circle, the operator strikes a light blow with the palm of his hand on the` ad 15, thereby compressing the spring 10 ang depressing the rod 11 until its lower end strikes the upper reduced end 9 of the point 7 and forces the point lightly into the metal. will be depressed sufficiently to putl the spring under a light tension, whereby the point is yieldingly held to its work and the circle is or may be scribed with less danger of losing the center than when using a centering compass-leg with a rigid point. When the two egs or points 17 and 18 are on the beam, the tool can be tilted on the point 7 to carry the top of the part B toward that side havingthe point thatit is desired to use, so that said point may strike the work, While the other point will be raised by the act of tilting the tool, and therefore not hit the surface of the work. By making the companionl leg or legs adjustable relatively to the length of the centering-leg the compass may be used for scribing a circle in a different plane from that on which the center is located. The advantage of holding the point In scribing a circle the handle f IOO IOO

with certainty under a yielding pressure at the desired center is attained in the use of the leg as a prick-punch for laying out work, as Well as in the use of the device in scribing a circle.

I claim as my invention l. The herein-described implement comprising a handle, a point slidingly mounted in the lower end thereof and having a stopshoulder for limiting the outward projection 0f the said point, a hammer slidingly mounted in the upper end thereof and having a stop-shoulder for limiting the outward movement of the said hammer, and a spring interposed between the said point and hammer and acting to force the said point and hammer outwardly for bringing the said stopshoulders into engagement with the said handle.

2. The herein-described implement comprising a handle, a point slidingly mounted 3. Theiherein-described implement, comprising a handle forming a compass-leg, a point slidingly and yieldingly mounted in the lower end thereof, a companion compassleg mounted on the said handle, and means for adjustably securing the said eoinpassdeg at various points in the length ol th(` said handle.

ADOLPll 1C. ABlC'lZ.

Witnesses JOHN SILL, Y. J. STEARNs.

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