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First Claim
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1. A PORTABLE DRAFTING INSTRUMENT COMPRISING:
- A BASE MEMBER HAVING A STRAIGHT EDGE PORTION ADAPTED GUIDABLY TO CONTACT A T-SQUARE OR ANALOGOUS RAIL AND AN ARM PORTION EXTENDING GENERALLY PERPENDICULARY FROM THE STRAIGHT EDGE PORTION SPACED ABOVE THE DRIFTING WORK;
A TRIANGLE MEMBER ADAPTED FOR PIVOTAL CONNECTION TO SAID ARM PORTION IN UNDERLYING CONNECTION TO SAID ARM PORTION IN ADAPTED FOR PIVOTAL CONNECTION TO SAID ARM PORTION IN OVERLYING RELATIONSHIP AND HAVING GRADUATED INDICIA LINES FOR USE IN DETERMINING THE RELATIVE ANGULATION OF SAID TRIANGLE MEMBER;
AND A COUPLING UNIT PIVOTALLY CONNECTING SAID TRIANGLE MEMBER AND SAID PROTRACTOR MEMBER TO SAID ARM PORTION, INCLUDING A CYLINDRICAL ELEMENT PASSING SLIDABLY AND ROTATABLY THROUGH ALIGNED APERTURES IN SAID TRIANGLE, SAID ARM PORTION AND SAID PROTACTOR MEMBER, A FIXED ABUTMENT ON ONE END OF SAID CYLINDRICAL ELEMENT GENERALLY UNDERLYING SAID MEMBERS, A MOVABLE ABUTMENT ON THE OPPOSITE END OF SAID CYLINDRICAL ELEMENT GENERALLY OVERLYING SAID MEMBERS, AND REVERSIBLY SITUATABLE REGULATING MEANS CONTACTING SAID MOVABLE ABUTMENT AND BEING MANIPULATABLE BETWEEN TWO PORTIONS OF RELATIVE ADJUSTMENT, SAID REGULATING MEANS ACTING TO URGE SAID MOVABLE ABUTMENT TOWARD SAID FIXED ABUTMENT IN ONE POSITION OF RELATIVE ADJUSTMENT FOR FRICTIONALLY LOCKING SAID TRIANGLE MEMBER AND SAID PROTRACTOR MEMBER TO SAID ARM PORTION, SAID REGULATING MEANS SERVING TO FREE SAID TRIANGLE MEMBER AND SAID PROTRACTOR MEMBER AT LEAST PARTIALLY FROM SAID FRICTIONAL LOCKING IN A DIFFERENT POSITION OF RELATIVE ADJUSTMENT.
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1 Claim
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1. A PORTABLE DRAFTING INSTRUMENT COMPRISING:
- A BASE MEMBER HAVING A STRAIGHT EDGE PORTION ADAPTED GUIDABLY TO CONTACT A T-SQUARE OR ANALOGOUS RAIL AND AN ARM PORTION EXTENDING GENERALLY PERPENDICULARY FROM THE STRAIGHT EDGE PORTION SPACED ABOVE THE DRIFTING WORK;
A TRIANGLE MEMBER ADAPTED FOR PIVOTAL CONNECTION TO SAID ARM PORTION IN UNDERLYING CONNECTION TO SAID ARM PORTION IN ADAPTED FOR PIVOTAL CONNECTION TO SAID ARM PORTION IN OVERLYING RELATIONSHIP AND HAVING GRADUATED INDICIA LINES FOR USE IN DETERMINING THE RELATIVE ANGULATION OF SAID TRIANGLE MEMBER;
AND A COUPLING UNIT PIVOTALLY CONNECTING SAID TRIANGLE MEMBER AND SAID PROTRACTOR MEMBER TO SAID ARM PORTION, INCLUDING A CYLINDRICAL ELEMENT PASSING SLIDABLY AND ROTATABLY THROUGH ALIGNED APERTURES IN SAID TRIANGLE, SAID ARM PORTION AND SAID PROTACTOR MEMBER, A FIXED ABUTMENT ON ONE END OF SAID CYLINDRICAL ELEMENT GENERALLY UNDERLYING SAID MEMBERS, A MOVABLE ABUTMENT ON THE OPPOSITE END OF SAID CYLINDRICAL ELEMENT GENERALLY OVERLYING SAID MEMBERS, AND REVERSIBLY SITUATABLE REGULATING MEANS CONTACTING SAID MOVABLE ABUTMENT AND BEING MANIPULATABLE BETWEEN TWO PORTIONS OF RELATIVE ADJUSTMENT, SAID REGULATING MEANS ACTING TO URGE SAID MOVABLE ABUTMENT TOWARD SAID FIXED ABUTMENT IN ONE POSITION OF RELATIVE ADJUSTMENT FOR FRICTIONALLY LOCKING SAID TRIANGLE MEMBER AND SAID PROTRACTOR MEMBER TO SAID ARM PORTION, SAID REGULATING MEANS SERVING TO FREE SAID TRIANGLE MEMBER AND SAID PROTRACTOR MEMBER AT LEAST PARTIALLY FROM SAID FRICTIONAL LOCKING IN A DIFFERENT POSITION OF RELATIVE ADJUSTMENT.
- A BASE MEMBER HAVING A STRAIGHT EDGE PORTION ADAPTED GUIDABLY TO CONTACT A T-SQUARE OR ANALOGOUS RAIL AND AN ARM PORTION EXTENDING GENERALLY PERPENDICULARY FROM THE STRAIGHT EDGE PORTION SPACED ABOVE THE DRIFTING WORK;
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Current AssigneeCharles Merrifield Frederick
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Original AssigneeCharles Merrifield Frederick
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InventorsCHARLES MERRIFIELD FREDERICK
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Application NumberUS04/257,960Time in Patent Office1,148 DaysField of SearchUS Class Current33/424CPC Class CodesB43L 7/12 Square and pivoted straight...
