US3237308A

US3237308A - Draftsman's compass

Info

Publication number: US3237308A
Application number: US405815A
Authority: US
Inventors: Virgil D Dorstewitz
Original assignee: Individual
Current assignee: Individual
Priority date: 1964-10-22
Filing date: 1964-10-22
Publication date: 1966-03-01
Anticipated expiration: 1983-03-01

Description

March 1, 1966 v. D, Do sT wrrz 3,237,308

DRAFTSMANS COMPASS Original Filed March 1'7, 1961 2 Sheets-Sheet 1 INVENTOR.

Vfryi/ D. Domsfew/fz BY MM ATTORNEY.

March 1, 1966 v. D. DORSTEWITZ 3,237,308

DRAFTSMANS COMPASS Original Filed March 17. 1961 2 Sheets-Sheet 2 25 g? x 7 L/ 7 32 40 20 QQ-Qn/ INVENTOR.

Virg H D. Dors few/f2 BYQWM ATTOE N E Y United States Patent 3,237,308 DRAFTSMANS COMPASS Virgil D. Dorstewitz, Baker St., Coloma, Mich. Continuation of application Ser. No. 96,444, Mar. 17, 1961. This application Oct. 22, 1964, Ser. No. 405,815

3 Claims. (CI. 33-27) This invention relates to a draftsmans compass, and is a continuation of my copending application, Serial No. 96,444, filed March 17, 1961. The main objects of the invention are,

First, to provide a draftsmans compass which is adapted for use and manipulation in the manner of draftsmens compasses of this general type and one which may bequickly adjusted to permit sharpening of the lead by means of a mechanical sharpener and without removal of the lead from its holder and which, after sharpening the lead, may be quickly adjusted to use or fully collapsed position.

Second, to provide a draftsmans compass having these advantages which may be economically produced and which is relatively compact when adjusted to non-use position and may be quickly and easily adjusted from use position to lead sharpening position, and vice versa,

Third, to provide a draftsmans compass having these advantages in which the adjustments for use, sharpening and complete collapsing may be made by manual manipulation merely by grasping and adjusting the parts.

Fourth, to provide a draftsmans compass having these advantages which may be economically produced.

Objects relating to details and economies of the invention will appear from the description to follow. The invention is defined and pointed out in the claims. A preferred embodiment of the invention is illustrated in the accompanying drawing, in which:

FIG. 1 is a side elevational view of a draftsmans compass embodying my invention in its fully collapsed or nonuse position.

FIG. 2 is a side elevational view illustrating one use position, a portion of a draftsmans board being conventionally illustrated.

FIG. 3 is a fragmentary cross-sectional view mainly in section on a line corresponding to line 33 of FIG. 1.

FIG. 4 is an enlarged fragmentary view corresponding to FIG. 3 with the parts of the compass adjusted to one use position.

FIG. 5 is a view mainly in section on a line corresponding to line 55 of FIG. 2, illustrating details of the mounting for the pointer.

FIG. 6 is an enlarged fragmentary view mainly in longitudinal section on a line corresponding to line 6-6 of FIG. 1, illustrating structural details of the lead holder.

FIG, 7 is an enlarged cross-sectional view on a line corresponding to line 77 of FIG. 6, illustrating further details of the lead supporting means.

FIG. 8 is a fragmentary view partially in vertical section, illustrating the compass with a lead holder member adjusted to sharpening position and in operative relation to a sharpening apparatus, the sharpening apparatus "ice illustrated being of the type of Cayo Patent 2,540,320, issued February 6, 1951.

FIG. 9 is a fragmentary sectional view corresponding to that of FIGS. 3 and 4 of a modified form or embodiment of my invention in which the gaskets are omitted, this being one commercial embodiment.

The embodiment of my invention illustrated comprises a first leg member 1 which is rigid from end to end thereof and has a compass pointer receiving bore 2 in the lower end thereof adapted to fittingly receive the pointer 3, see FIGS. 1, 2 and 5. The leg member has a lateral opening 4 which opens to the pointer receiving bore 2, see FIG. 5. The inner end of the clamp member 5 is disposed in this opening and engages the pointer 2, as is illustrated, the clamp member being secured by means of the screw 6 disposed through an opening 7 in the leg member and having threaded engagement with the clutch or clamp member 5. The second leg member 8 is of substantially less length than the leg member 1. The leg members 1 and 8 are pivotally connected at their upper ends, the upper ends being in pivotal or swinging engagement with the pivot or bearing member 9. The leg members have inwardly facing bearings which coact with this pivot member, as is illustrated in FIGS. 1 and 2.

The bowed spring 10 is engaged with the outwardly facing notches 11 in the leg members, which are disposed above the pivot 9. The fingerpiece or handle 12 projects above the spring 10. These

parts

10 and 12 are commonly grasped in the manipulation of the compass.

The leg members 1 and 8 are adjustably connected by means of the screw 13 disposed therethrough below the pivot member 9 and provided with a fingerpiece 14 disposed between the leg members 1 and 8, these leg members having recesses or notches 15 on their inner sides adapted to receive the fingerpiece 14 when the leg members are in fully closed position as shown in FIG. 1. The adjusting screw has threaded engagement with the pivoted threaded members 16 which are conventionally shown in FIGS. 1, 2 and 8.

As stated, the leg member 8 is shorter than the leg member 1 and is provided at its lower end with a laterally and downwardly projecting pivot ear 17 which has oppositely projecting shoulders 18 at the inner end of the ear, as is clearly illustrated in FIGS. 1, 3 and other figures. The lead holder member, designated generally by the numeral 19, constitutes part of the leg member 8. It is provided with pivot ears 20 which embrace or are disposed at the sides of the pivot ear 17 on the lower end of the leg member 8.

In the embodiment illustrated in FIGS. 3 and 4, friction disks 21 are disposed between the car 17 and the pivot ears 20 of the lead holder member of the leg 8. These friction disks are omitted as illustrated in FIG. 9. The lead holder member has angularly disposed shoulders or

abutments

22 and 23 which coact with the shoulder 18 on the lower end of the member 8, the shoulder 23 being in engagement with the abutment 18. The lead holder member 19 is in use position as illustrated in FIG. 1, and in one drafting or use position as illustrated in FIG. 2. The shoulder 22 is in thrust supporting engagement with the shoulder or abutment 18 when the lead holder member 19 is adjusted to sharpening position as illustrated in FIG. 8 while the shoulder 23 is in thrust supporting engagement with abutment 18 when the lead holder is adjusted to drafting use position. This is an important feature of the applicants invention and will be further described after structural details of the pointer and lead holder member have been described.

The portion 24 of the lead holder member 19 is tubular and has a threaded portion 25 with which the inner end of the tubular lead socket member 26 is in threaded engagement, see FIG. 6. The lead clutch member 27 projects into the portion 24 of the lead holder member 19 and has a socket 28 in its inner end adapted to receive the lead 40, as is illustrated in FIG. 6, and has longitudinal slits 29 in the portion thereof below the portion 24 of the lead holder and a tapered portion 30 at its lower end. The tapered portion of the member 27 is in clutching or gripping engagement with the tapered portion 31 of the lead holder so that the lead is clampingly secured, but it is not subjected to breaking stress. The only portion of the member 26 which engages the lead holder is the tapered lower portion. With this arrangement, the lead can be quickly and easily adjusted to compensate for wear or breakage.

It should be understood that the members 1 and 8 are commonly adjusted to and from use position by manipulation of the fingerpieee 14 of the adjusting screw 13.

In the embodiment shown in FIGS. 3 and 4 friction gaskets 21 are used but they are not used in the embodiment shown in FIG. 9, the ears on the lead holder member being somewhat springable to permit their being frictionally engaged with 17 by means of the connection for the lead holder member to the pivot ear 17. The coupling and pivot member 32 is provided with a head at one end adapted to receive a screw driver or the like and has a threaded bore at the other end for the clamping screw 33, which is also provided with a head adapted to receive a screw driver or the like.

With the member 19 adjusted to bring its abutments 22 into engagement with the abutments 18 at the inner end of the coupling ear 17, the lead holder member is supportedly positioned as illustrated in FIG. 8 and can be inserted into a mechanical sharpener such as illustrated and which comprises a body portion 34 provided with a rotatable portion 35 having a socket 36 into which the lead holder member may be inserted, the abrasive unit being illustrated at 37. The member 35 is rotated. by means of the inserted lead holder. The sharpening instrument illustrated is that of the Cayo Patent 2,540,320, issued February 6, 1951, which has been extensively manufactured. As pointed out, this connection for the lead carrying portion of the leg 8 to the body or supporting portion permits adjustment merely by grasping and swinging the lead carrying portion member 24 to drafting position as illustrated in FIG. 2, and to sharpening position as illustrated in FIG. 8. The leg members may be adjusted to any position from collapsed position as shown in FIG. 1 to any position of use within their scope of adjustment.

I have illustrated and described my invention in a highly practical commercial embodiment thereof. I have not attempted to illustrate or describe the various structural details which might be desirable for compasses of particular design, as it is believed that this disclosure will enable those skilled in the art to embody or adapt my invention as may be desired.

Having thus described the invention, what is claimed as new and desired to secure by Letters Patent is:

1. A draftsmans compass comprising a first leg member rigid from end to end thereof and having a compass pointer receiving bore opening at its lower end and at the outer side thereof in upwardly spaced relation to its lower end, a pointer disposed in said bore, a manually adjustable means for fixedly securing said pointer to said first leg member, a second leg member of substantially less length than said first leg member, said leg members being pivotally connected at their upper ends, manually operable means for adjusting said leg members relative to each other and for supporting them in their adjusted position, said second leg member having an outwardly .and downwardly projecting pivot ear at its lower end, a lead holder member having laterally spaced pivot ears on its upper end disposed in embracing relation to said pivot car on said second leg member, friction elements disposed between said pivot ears on said second leg member and said lead holder member, .a pivot swingably connecting said pivot ears, said second leg member having a straight abutment spaced upwardly from said pivot and inclined upwardly and outwardly of the axis of the second leg, said lead holding member having two abutments arranged angularly over the top and downwardly along the inside of said pivot and alternatively engageable with said abutment on said second leg in drafting use relation with said second leg in generally extended relation below said second leg and in outwardly angled projecting relation to said second leg to facilitate sharpening of a lead in said lead holder member, the friction in said connection for said lead holder member to said second leg member being such as to hold the lead holder member in drafting use position and also when adjusted to said angular position.

2. A draftsmans compass comprising a first leg member rigid from end to end thereof and having a compass pointer receiving bore opening at its lower end and at the outer side thereof in upwardly spaced relation to its lower end, a pointer disposed in said bore, a manually adjustable means for fixedly securing said pointer to said first leg member, a second leg member of substantially less length than said first leg member, said leg members being pivotally connected at their upper ends, manually operable means for adjusting said leg members relative to each other and for supporting them in their adjusted position, said second leg member having an outwardly and downwardly projecting pivot ear at its lower end, a lead holder member having laterally spaced pivot ears on its upper end disposed in embracing relation to said pivot ear on said second leg member, a pivot swingably connecting said pivot ears, said second leg member having an abutment inclined from a point at the inner side of said pivot upwardly and outwardly of said second leg and over said pivot, said lead holder ears having relatively angled abutment edges inclined downwardly on the inner side of said pivot and outwardly to the outer side of said pivot from above said pivot to alternatively an selectively engage said abutment on said second leg to support said lead holder member in drafting use relation to said first leg member and also when adjusted to an outwardly projecting angular relation to said first and second leg members to facilitate sharpening of a lead in said lead holder member, the friction in said connection for said lead holder member to said second leg member being such as to hold the lead holder member in drafting use position and also when adjusted to said angular position.

3. A draftsmans compass comprising a first leg member provided with a nontiltable pointer at its lower end, a second leg member of substantially less length than the first leg member, said leg members being adjustably connected at their upper ends, a lead holder member, the lower end of said second leg member and the upper end of said lead holder member being provided with ears disposed in tongue and groove, over-lapping relation, a pivot car on one of the members lapped between a pair of ears on the other member, and a combined pivot and clamp member for said pivot ears, said second leg member having a downwardly and inwardly inclined linear abutment formed thereon and extending above said pivot and clamp member to the inner side of the second leg member in spaced relation to the pivot and clamp member, said lead holder member having another abutment formed thereon and arranged in angular relation relative to said pivot linearly and generally transversely in upwardly spaced relation to the upper side of the pivot then linearly downwardly in spaced relation to the inner side of the pivot and in opposed coplanar relation to the first abutment and said second leg member and alternatively engageable in oscillated positions of said lead holder member with said first abutment for transversely outwardly supporting said lead holder member in drafting position and for longitudinally downwardly supporting said lead holder member in angular laterally projecting relation to said second leg member to facilitate the sharpening of a lead mounted in said lead holder member.

References Cited by the Examiner UNITED STATES PATENTS 5/1888 Bormann 3330 1/1899 Downs 33149 7/1907 Mohnike 3316O 7/1909 Taylor 33l60 2/ 1913 Weikel 33--27 10/1916 Peck 33150 1/1945 Hunt 3327 6/1951 Fairbanks 33-27 FOREIGN PATENTS 8/1897 Germany.

15 ISSAC LISANN, Primary Examiner.

Claims

1. A DRAFTSMAN''S COMPASS COMPRISING A FIRST LEG MEMBER RIGID FROM END TO END THEREOF AND HAVING A COMPASS POINTER RECEIVING BORE OPENING AT ITS LOWER END AND AT THE OUTER SIDE THEREOF IN UPWARDLY SPACED RELATION TO ITS LOWER END, A POINTER DISPOSED IN SAID BORE, A MANUALLY ADJUSTABLE MEANS FOR FIXEDLY SECURING SAID POINTER TO SAID FIRST LEG MEMBER, A SECOND LEG MEMBER OF SUBSTANTIALLY LESS LENGTH THAN SAID FIRST LEG MEMBER, SAID LEG MEMBERS BEING PIVOTALLY CONNECTED AT THEIR UPPER ENDS, MANUALLY OPERABLE MEANS FOR ADJUSTING SAID LEG MEMBERS RELATIVE TO EACH OTHER AND FOR SUPPORTING THEM IN THEIR ADJUSTED POSITION, SAID SECOND LEG MEMBER HAVING AN OUTWARDLY AND DOWNWARDLY PROJECTING PIVOT EAR AT ITS LOWER END, A LEAD HOLDER MEMBER HAVING LATERALLY SPACED PIVOT EARS ON ITS UPPER END DISPOSED IN EMBRACING RELATION TO SAID PIVOT EAR ON SAID SECOND LEG MEMBER, FRICTION ELEMENTS DISPOSED BETWEEN SAID PIVOT EARS ON SAID SECOND LEG MEMBER AND SAID LEAD HOLDER MEMBER, A PIVOT SWINGABLY CONNECTING SAID PIVOT EARS, SAID SECOND LEG MEMBER HAVING A STRAIGHT ABUTMENT SPACED UPWARDLY FROM SAID PIVOT AND INCLINED UPWARDLY AND OUTWARDLY OF THE AXIS OF THE SECOND LEG, SAID LEAD HOLDING MEMBER HAVING TWO ABUTMENTS ARRANGED ANGULARLY OVER THE TOP AND DOWNWARDLY ALONG THE INSIDE OF SAID PIVOT AND ALTERNATIVELY ENGAGEABLE WITH SAID ABUTMENT OF SAID SECOND LEG IN DRAFTING USE RELATION WITH SAID SECOND LEG IN GENERALLY EXTENDED RELATION BELOW SAID SECOND LEG AND IN OUTWARDLY ANGLED PROJECTING RELATION TO SAID SECOND LEG TO FACILITATE SHARPENING OF A LEAD IN SAID LEAD HOLDER MEMBER, THE FRICTION IN SAID CONNECTION FOR SAID LEAD HOLDER MEMBER TO SAID SECOND LEG MEMBER BEING SUCH AS TO HOLD THE LEAD HOLDER MEMBER IN DRAFTING USE POSITION AND ALSO WHEN ADJUSTED TO SAID ANGULAR POSITION.