US984697A - Compasses. - Google Patents

Compasses. Download PDF

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Publication number
US984697A
US984697A US52521809A US1909525218A US984697A US 984697 A US984697 A US 984697A US 52521809 A US52521809 A US 52521809A US 1909525218 A US1909525218 A US 1909525218A US 984697 A US984697 A US 984697A
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United States
Prior art keywords
leg
plates
compasses
screw
members
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Expired - Lifetime
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US52521809A
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Fritz Pfaff
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Individual
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/16—Compasses, i.e. with a pair of pivoted arms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/25—Movable or adjustable work or tool supports
    • B23Q1/44—Movable or adjustable work or tool supports using particular mechanisms
    • B23Q1/50—Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism
    • B23Q1/54—Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism two rotating pairs only
    • B23Q1/545—Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism two rotating pairs only comprising spherical surfaces
    • B23Q1/5462—Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism two rotating pairs only comprising spherical surfaces with one supplementary sliding pair

Definitions

  • the subject of the present invention con* cerns improvements in and relating to compasses.
  • the essential features of this invention consist of a. compass having tlnee legs whereby two circles having a different radius can be drawn simultaneously.
  • the two outer legs are of the same length, but the middle leg is adjustable in length; furthermore either of the outer legs can turn on its own pivot independently of the other.
  • FIG. 1 is a front elevation showing the compass closed up.
  • Fig. 2 is a side elevation of same.
  • Fig. 3 is a sectional side elevation on line A-B of Fig. 1.
  • Fig. 4 is a section on line C4D of Fig. 1.
  • the compass consists of two suitably shaped plates 1 adapted to carry two pairs of side members 2; said plates 1 also carry the cent-ral leg 3, while the two pairs of members 2 are also suitably formed and constitute the side legs.
  • the members 2 are rounded off at the top and each pair is secured by a screw 4 on which it is revolubly mounted.
  • the screws 4 carry integral heads 5 provided with a projecting point 6 which fits in a suitable recess in one of the members thereby preventing the screw from turning when the nut 7 is being tightened up.
  • the legs can be adjusted to any desired position by first loosening the nut 7, pulling out the leg to the required extent, then tightening up the nut.
  • Two disks 8 are inserted between the plates 1 to keep them apart, the screws 4 passing through said disks 8. (Figs. 3 and 4).
  • the leg 3 is provided with a longitudinal slot 9 in which is carried a screw 10 provided with a nut 11.
  • the upper part of the leg 3 is adapted to slide between the flatportions 12 of the disks 8. If the leg 3 is drawn up in the position shown in Fig. 1, the two outer legs can be used in the ordinary way as with the known type of Compasses. By unscrewing or loosening the nut 11, the leg 3 slides down between the lower continuations of the plates 1 until its point is in the same plane as the points of the other legs.
  • the screw 10 passes through the plates 1 and the leg 3 situated between said plates, so that by screwing up the nut 11, the leg 3 is secured immovably.
  • the other two legs can be made to simultaneously describe two circles, each circle having a diderent radius.

Description

F. PFAFF. UOMPASSES. APPLIoATIoN FILED 001229, 1909.
Patented Feb. 21, 1911.V
TH: NoRRls PETERS cu.,'wAsHlNsTcN, D, c4
UNITED STATES ATENT FFICE.
FRITZ PFAFF, OF ACACIAS, GENEVAQSWITZERLAND.
COMPASSES.
Specification of Letters Patent. Patented Feb. 21, 1911. Application filed October 28, 1909.
Serial No. 525,218.
To all whom 'it may concern.
Be it known that I, FRITZ PFAFF, a citizen of Switzerland, and resident of Acacias, Geneva, Switzerland, have invented Improvements in and Relating to Compasses, of which the following is a specification.
The subject of the present invention con* cerns improvements in and relating to compasses.
The essential features of this invention consist of a. compass having tlnee legs whereby two circles having a different radius can be drawn simultaneously. The two outer legs are of the same length, but the middle leg is adjustable in length; furthermore either of the outer legs can turn on its own pivot independently of the other.
In order that this invention may be fully understood, reference is made to the accompanying drawing, in which Figure 1 is a front elevation showing the compass closed up. Fig. 2 is a side elevation of same. Fig. 3 is a sectional side elevation on line A-B of Fig. 1. Fig. 4 is a section on line C4D of Fig. 1.
The compass consists of two suitably shaped plates 1 adapted to carry two pairs of side members 2; said plates 1 also carry the cent-ral leg 3, while the two pairs of members 2 are also suitably formed and constitute the side legs. The members 2 are rounded off at the top and each pair is secured by a screw 4 on which it is revolubly mounted. The screws 4 carry integral heads 5 provided with a projecting point 6 which fits in a suitable recess in one of the members thereby preventing the screw from turning when the nut 7 is being tightened up. Thus the legs can be adjusted to any desired position by first loosening the nut 7, pulling out the leg to the required extent, then tightening up the nut. Two disks 8 are inserted between the plates 1 to keep them apart, the screws 4 passing through said disks 8. (Figs. 3 and 4).
The leg 3 is provided with a longitudinal slot 9 in which is carried a screw 10 provided with a nut 11. The upper part of the leg 3 is adapted to slide between the flatportions 12 of the disks 8. If the leg 3 is drawn up in the position shown in Fig. 1, the two outer legs can be used in the ordinary way as with the known type of Compasses. By unscrewing or loosening the nut 11, the leg 3 slides down between the lower continuations of the plates 1 until its point is in the same plane as the points of the other legs. The screw 10 passes through the plates 1 and the leg 3 situated between said plates, so that by screwing up the nut 11, the leg 3 is secured immovably. Thus by using one of the outer legs as an axis, the other two legs can be made to simultaneously describe two circles, each circle having a diderent radius.
An important feature lies therein, that if the radius of a given circle has been established, say for insta-nce by means of the right hand outer leg and the middle leg, the same radius can be employed any time thereafter if meantime the left-hand outer leg and t-he middle leg are used as ordinary Compasses, that is to say the left hand leg can now be moved in and out to describe circles of different radii, while when it is desired to draw a circle of the iirst established radius, the left hand leg is moved around up out of the way, the middle leg is lowered again, and the compass is already for drawing the required circle.
Having fully described my invention, what I claim and desire to secure by Letters Patent is z- Improvements in and relating to compasses, comprising in combination, two plates, two pairs of members having recesses secured to said plates, a leg formed by each pair of the said members, a middle leg having a slot and being secured between said plates, a screw passing through said plates and the slot in said middle leg, a nut adapted to screw on to said screw, disks placed between said plates, a screw passing through each pair of said members, said plates and a. disk, nuts adapted to screw on to the ends of said screws, the latter having pointed projections integral therewith, each of said projections engaging in a suitable recess in one of each pair of members, whereby said screws are prevented from turning when the nuts are being tightened up, substantially as described and shown and for the purpose set forth.
In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.
FRITZ PFAFF.
Witnesses:
L. H. MUNIER, G. VULLIE. Y
US52521809A 1909-10-28 1909-10-28 Compasses. Expired - Lifetime US984697A (en)

Priority Applications (1)

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US52521809A US984697A (en) 1909-10-28 1909-10-28 Compasses.

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US52521809A US984697A (en) 1909-10-28 1909-10-28 Compasses.

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5398577A (en) * 1993-11-10 1995-03-21 Pierce; Danny K. Method and apparatus for tree felling
US9377281B2 (en) 2013-12-23 2016-06-28 James Dankowski Precision tool for locating center lines in geometric shapes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5398577A (en) * 1993-11-10 1995-03-21 Pierce; Danny K. Method and apparatus for tree felling
US9377281B2 (en) 2013-12-23 2016-06-28 James Dankowski Precision tool for locating center lines in geometric shapes

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