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US 4,438,569 AGranted
Drafting machine
AssigneeRobert J. Gillespie
InventorWalter Weglin
Life of this patent
Estimating the term…
Abstract
A drafting machine includes a pair of perpendicular straight edges slidably mounted with respect to reference scales integrally mounted within the drafting machine. A fine adjustment mechanism includes a worm and spur gear combination for moving the straight edges with respect to the scales. An override mechanism allows the straight edges to move freely with respect to the scales. The drafting machine preferably includes a second adjustable scales adjacent each reference scales for ease and accuracy in measuring.
Claims26
A drafting machine for use with a drafting table having a drawing surface, which comprises:
- a protractor head adapted to be movably mounted on a drafting table such as to permit horizontal and vertical movement of the protractor head along the drawing surface of the drafting table;
- an elongated first mounting means rotatably mounted on the protractor head and having an elongated first reference scale, the longitudinal axis of the first reference scale being parallel to the longitudinal axis of the first mounting bar;
- an elongated second mounting means slidably mounted on the first mounting means with the longitudinal axis of the second mounting means being perpendicular to the longitudinal axis of the first mounting means, the second mounting means having an elongated second reference scale, the longitudinal axis of the second reference scale being parallel to the longitudinal axis of the second mounting means;
- first and second elongated straight edges, said first straight edge being slidably mounted with respect to the second mounting means and the second straight edge, the longitudinal axis of the first straight edge being parallel to the first mounting means and being perpendicular to the longitudinal axis of the second mounting means and to the second straight edge, the first straight edge being alignable with the reference scale of the second mounting means;
- and
- said second straight edge being mounted on the second mounting means so as to be slidably mounted with respect to the first mounting means, the longitudinal axis of the second straight edge being perpendicular to the longitudinal axis of the first mounting means, the second straight edge being alignable with the first reference scale.
3 more elements
In a drafting machine:
- first and second straight edge providing means;
- mounting means slidably mounting said first straight edge means to move along said second straight edge providing means in perpendicular relation thereto;
- a rack on the second straight edge providing means;
- a pinion normally meshing with the rack;
- a worn gear driving the pinion;
- a worm meshing with the worn gear;
- means carried by said mounting means for selectively swinging the pinion, worm gear, and worm as a unit out of mesh with the rack;
- and
- means biasing said unit into mesh with the rack.
6 more elements
In a drafting machine:
- first and second straight edge providing means;
- a guide rod mounted on said second straight edge providing means and extending in parallel spaced relation thereto;
- a housing sleeved on said guide rod and having sliding engagement with said second straight edge providing means;
- means mounting said first straight edge providing means on said housing such that said first and second straight edge providing means are always perpendicular to one another as said housing is moved along said guide rod;
- scale means mounted on said second straight edge providing means;
- and
- a sight glass mounted in said housing and overlying said scale means for determining the position of said first straight edge providing means relative to said scale means.
4 more elements
In a drafting machine:
- straight edge providing means having a longitudinal slot;
- an adjustable scale with an opening therethrough registering with said slot;
- a jack screw mounted on said straight edge providing means and extending parallel to said scale and slot;
- traveler nut means on said jack screw and extending over said opening in the scale;
- and
- a screw threaded into said traveleer nut means and projecting through said opening into said slot.
3 more elements
In comination:
- an elongated unit;
- a slide unit on the elongated unit;
- a rack along the elongated unit;
- an adjustment and locking assembly on the slide unit, said assembly including a housing swing-mounted on the slide unit, a pinion journaled in the housing and meshing with the rack for fine adjustment of the slide unit relative to the elongated unit and for locking the slide unit relative to the rack when the pinion is not being turned for said fine adjustment;
- a worm gear journaled in the housing for driving the pinion, a worm journaled in the housing and meshing with the worm gear, a handle extension on the worm for manually turning it to responsively provide said fine adjustment and for swinging said assembly into an inoperative position away from meshing engagement of the pinion with the rack so that the slide unit is free to slide on the elongated unit;
- and
- means biasing said assembly such that the pinion is normally meshing with the rack.
4 more elements
Dependencies are inferred from the claim text.