US1085415A - Compasses. - Google Patents

Description

G. HALVORSBN z 0. KROGLUND.

COMPASSBS.

APPLICATION FILED JAN. 29, 3.913.

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Patented Jan. 27, 1914.

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a num/tow G. HALVORSEN dz 0. KROGLUND.

GOMPASSBS.

APPLICATION IILBD IAN. 2s. 1913.

Patented Jan. 27, 1914.

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. UNTTED STATES PATENT OFFICE.

GILBERT HALVORSEN ANI) OLAF KROGLUN D, OF BIRMINGHAM, ALABAMA.

COMPASSES.

AppIication led January 29, 1913.

To all 'whom it may concern.'

Be it known that we, GILBERT HALvoRsEN and OLAF KROGLUND, citizens of the United States, residing at Birmingham, in the county of Jefferson and State of Alabama, have invented new and useful Improvements in Compasses, of which the following 1s a specification. c

The invention relates generally to an irnproved compass and particularly to a compass constructed for the drawing in the usual operation of the compass of a ligure of any desired outline.

The main object of the present invention is the provision of a compass constructed to permit the cooperation therewith of a pattern plate of any desired configuration with the scribing leg constructed to automati- 'cally follow the outline of the pattern plate in the ordinary use of the compass, the carrier for the pattern plate being adjustable toward and from the pivotal support of the scribing leg in order to vary the size of the particular figure drawn as may be desired.

The invention in its preferred form of details will be described in the following specification, reference being had to the accompanying drawings, in kwhich Figure 1 is a perspective view of the iinproved compass. Fig. 2 is a longitudinal section through the same. Fig. 3 is a transverse section through the pivot leg on the line 3-3 of Fig. 1. Fig. 4 is a vertical sectional view through the head plate. Fig. 5 is an enlarged view in elevation of the Figs. 6, 7, 8 and 9 are plans of different types of pattern plates.

Referring particularly to the accompanying drawings, the improved compass coinprises what may be termed a head 1 including an approximately cylindrical portion 2 having offset spaced ears 3. The head forms a support for the pivot leg 4 and for the scribing leg 5 and is provided with a milled disk 6 at the upper end thereof whereby the device may be operated as hereinafter described. An adjusting shaft 7 is mounted for independent rotary movement in the cylindrical portion 2 of the head, said shaft projecting beyond the disk 6 in one direction in the form of a stem 8, the upper end of which is formed or Provided with an operating button 9. Beyond the head 1 in the opposite direction, that is below the head, the shaft 7 is extended in the form of a threaded shaft 10, the construction provid- Specication of Letters Patent.

Patented Jan. 27, 1914. Serial No. 744,933.

ing. for securing the shaft 7 in the head against independent longitudinal movement, but to permit free rotary movement. The pivot leg 4 which in the present form of the device is shown as an approximately rectangular hollow casing is mounted upon the shaft 7 immediately adjacent the head, `the connection between the leg and shaft being such as to permit the free rotary movement of the leg independently of the shaft. The lower end of the leg is rovided with a terminal block 11 in whic is rotatably mounted the lower end of the adjusting shaft, a cap plate 12, preferably carried by the block 11 closing the lower end of the leg and being formed with a plurality, preferably three, pivot points 13. The points 13 which may be of any appropriate lengths or size are preferably arranged in alinement diagonally of the cap plate. Slidably mounted upon the pivot leg 4 1s a pattern plate carrier 14, said carrier comprising a hollow rectangular meinber interiorly shaped to conform to the shape of the leg and snugly fitting same whereby the plate is adapted for sliding movement longitudinally of the leg to hold against independent rotary movement thereon. The carrier is provided with an interiorly arranged projection 15 terminating in interiorly threaded section 10 of the adjusting shaft, said projection extending through a slot 17 longitudinally formed in the pivot leg and preferably extending practically throughout the length of such leg whereby in the movement of the adjusting shaft the carrier may be adjusted to any position between the -ends of the pivot leg. The carrier is exteriorly provided with a transversely arranged rectangular rib 18, and on opposite sides the same is further provided with retaining springs 19 preferably of leaf form having their upper ends secured to the carrier above the rib and their lower ends resting loosely against the surface of the carrier, the body of the springs being curved from the proximate surface of the carrier and having their maximum point of projection beyond the carrier at a point the same distance below the rib.

The scribing leg comprises a. hollow body provided at the upper end with an ear 20 to fit between and permit pivotal connection with the ears 3 of the head. Within the hollow scribing leg is arranged a marker carrier comprising a rod like -member 21 formed at the lower end toreceive the lead -or other marker 22, said rod member loosely fitting within the scribing leg .and being diametrically reduced for a portion of its length to provide what may be termed a recess 23 designed to receive a pin or screw 24 passed through the scribing leg whereby to limit the independent longitudinal movement of the rod like member within the scribing leg. A spring 25 is housed within the scribing leg bearing between the upper end thereof and the proximate end of the rod member 21 whereby tol normally maintain said rod member, and hence the lead or other marker projected to the limit of movement beyond the scribing leg under ordinary circumstances. A leaf spring 26 is secured to thehead above the pivotal connection of the scribing leg therewith and bears at its free end against the scribing leg said spring serving to normally force said scribing leg into contact with the pivot le 2(iin conjunction with the pattern carrier 14 we use apattern plate 27 having anl edge contour of any desired form. That illustrated in Fig. l of the drawings is of oval form, while such as are illustrated in Figs. 6 to 9 show different forms. In this connection it is to be understood. that we contemplate the use of any form of'pattern plate as the 'device is operative with a pattern plate havf ing any form of outline. Each pattern plate without regard to its outline formis centrally formed with an aperture 28 corresponding in size and shape to the sectional dimensions of the carrier, the opposing edge walls of the aperture being further formed with recesses 29 to receive the springs 19.

The pattern plate is assembled by passing same over the end of the pivot leg and over the carrier, lthe recesses 29 receiving the springs and the pattern plate being moved until it contacts with the rib 18. As the maximum projection of the spring is below the rib it is obvious that in the movement of the pattern plate it will pass beyond such points the maximum projection and will be held in position by the spring.

With the parts thus constructed and the pattern plate of desired form in position the improved compass is operated as follows: The shaft 7 is turned through the medium of the button 9 until the carrier with the pattern plate thereon is moved to that position on the pivot leg as will provide a figure of the desired size it being obvious that the adjustment of the carrierv toward the head of the compass increases the size of the iigure. The pivot points 13 are then forced into the paper or other surface on which the figure is to be drawn, care being taken in the operating of the oval or similar ligure to have the pivot points alined with the major axis of the oval. As the points are forced into the paper or surface it is obvious that the pivot leg is fixed with relation to said surface, and hence the pattern plate is correspondingly fixed. Pressure is then maintained upon the button 9 to insure the fixed. relation of the parts with the paper to prevent accidental inclination of the movement of 'the` pivot leg. The device is then operated as the ordinary compass, the disk 6 being used to turn the scribing leg. As the spring 26 will serve to hold the scribing leg in contact with the 'edge of the pattern plate it is obvious that in moving of the le about the pivot leg as the center the scribing leg Will follow the outline of the pattern plate and hence a figure corresponding to such outline will be drawn upon the surface. As the scribing leg moves toward and from the pivot leg due to the outline of the pattern plate the spring 25 serves Jto-automatically maintain the marker member 21 in contact with` the paper, automatically compensating for the necessary differences in the length of the scribing leg. As the pivot leg member is independently rotatable upon the shaft 7 it is obvious that the pattern may be adjusted in accordance with the surface being drawn upon, that is it may be turned to dispose the major axis of the pattern plate in one direction or another.

rlhe device 'provides a simple compass which through the luse of di'erent pattern plates may be directed to inscribe a ligure having any outline or form and by the adjustment of the pattern plate longitudinallyl of the pivot leg such gure may be given any size within the limits of the device.

What is claimed is :e 1

1. A compass including a pivot leg, a pattern plate thereon, means for adjusting the pattern plate longitudinally of the pivot leg, a scribing leg, "and means for holding the scribing leg in contact with the pattern plate.

2. A compass including a head, a pivot leg connected thereto, an adjusting shaft mounted in the head and extending longitudinally of the pivot head, a pattern plate, means connecting the plate and shaft to adjust the plate longitudinally of the pivot leg in the operation of the shaft, a scribing leg pivotally connected to the head and means for holding the scribing leg in contact with the pattern plate.

3.. A compass including ahead, a pivot leg carried-thereby, an adjusting shaft mounted in the head and extending longitudinally thereof, said shaft within the pivot leg being threaded, a carrier mounted on the pivot leg, a connection between said carrier and shaft, a pattern plate arranged on the carrier, a scribing leg pivotally connected to the head, and a spring for forcing said scribing leg into contact with the pattern plate.

4. A compass including a head, a pivot leg carried thereby, an' adjusting shaft mounted in the head and extending longitudinally thereof, said shaft within the pivot leg being threaded, a carrier mounted on the pivot leg, a connection between said carrier and shaft, a pattern plate arranged on the carrier, a scribing leg pivotally connected to the head, and a spring for forcing said scribing leg into Contact with the pattern plate, and automatically extended lead carrier mounted in the scribing leg.

5. A compass including a scribing leg, a pivot leg, a pattern carrier adjust-able longitudinally of the pivot leg, said carrier including a body to be slidably mounted on the pivot leg and formed with a rib,springs secured to the body and disposed beyond thel surface thereof, a maximum point of projection of the springs beyond the surface being below the rib.

6. A compass including a scribing leg, a pivot leg, a attern carrier adjustable longitudinally of the pivot leg, said carrier including a body to be slidably mounted on the pivot leg and formed with a rib, springs secured to the body and disposed beyond the surface thereof, a maximum point of projection of the springs beyond the surface bein@ below the rib, and a pattern plate formed with an aperture corresponding to the size and shape of the section dimension of the body, opposing walls of the aperture being formed with recesses to engage the springs.

In testimony whereof we aiix our signatures in presence of two Witnesses.

GILBERT HALVORSEN. OLAF KROGLUND. Witnesses:

VERA J ONES, WVM. H. COOK.

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