Drawing projector for reproducing curves

Claim 2

Apparatus for reproducing curved lines including in combination a beam, a pivot, the beam having a slot therein extending lengthwise of the beam and through which the pivot Extends in a direction substantially normal to the direction of extent of the slot whereby the beam is movable with respect to the pivot both angularly and in the direction of the length of the beam, a scriber carried by the beam in a position to travel over a work surface as the beam moves with respect to the pivot, a frame that holds the pivot in a relatively fixed position during the movement of the scriber over said work surface, a link element connected with the beam, an axis bearing connected with the link element at a location spaced from the connection of the link element to the beam, the link element being made of parts that are adjustable by movement with respect to one another to change the length of the link element between the axis bearing and the connection of the link to the beam, and means for moving the link element angularly about said axis bearing to impart angular and sliding movement to the beam with respect to the pivot.

Claim 3

The apparatus described in claim 1 characterized by a scale along one of the movable parts of the link element for indicating the effective adjusted distance between the center of angular movement of the link on the axis bearing and the center of angular movement of the link and beam.

Claim 4

The apparatus described in claim 1 characterized by a frame on which the axis bearing is supported, the link element comprising a disc with a center bearing that rotates on the axis bearing, a block that slides along a slot in the disc, said slot extending in a direction having a radial component, means for clamping the block at desired locations along the slot, the block being a part of the link element that connects with the beam.

Claim 5

The apparatus described in claim 3 characterized by the disc and frame having a scale on one of them and a position indicator on the other for indicating angular positions of the disc, a base for placing on a support, the pivot being connected to the base as a unitary part thereof, the disc-supporting frame being located on the base and slidable along the base toward and from the pivot, guides on the base for the frame, and scales for indicating the spacing of the axis bearing from the pivot as the position of the frame is adjusted along the guides.

Claim 6

Apparatus for reproducing curved lines including in combination a beam, a pivot, the beam having a slot therein extending lengthwise of the beam and through which the pivot extends in a direction substantially normal to the direction of extent of the slot whereby the beam is movable with respect to the pivot both angularly and in the direction of the length of the beam, a scriber carried by the beam in a position to travel over a work surface as the beam moves with respect to the pivot, a link element connected with the beam, an axis bearing connected with the link element at a location spaced from the connection of the link element to the beam, means for adjusting the spacing of the axis bearing toward and from the pivot, said means for adjusting the spacing including means for holding the axis bearing and the pivot at a fixed spacing from one another after each adjustment, and means for moving the link element angularly about the axis bearing to impart angular and sliding movement to the beam with respect to the pivot.

Claim 7

Apparatus for reproducing curved lines including in combination a beam, a pivot, the beam having a slot therein extending lengthwise of the beam and through which the pivot extends in a direction substantially normal to the direction of extent of the slot whereby the beam is movable with respect to the pivot both angularly and in the direction of the length of the beam, a scriber carried by the beam in a position to travel over a work surface as the beam moves with respect to the pivot, a link element connected with the beam, an axis bearing connected with the link element at a location spaced from the connection of the link element to the beam, means for adjusting the spacing of the axis bearing toward and from the pivot, said means for adjusting the spacing including means for holding the axis bearing and the pivot at a fixed spacing from one another after each adjustment, and means for moving the link element angularly about the axis bearing to impart angular and sliding movement to the beam with respect to the pivot.

Claim 8

The apparatus described in claim 5 characterized by the means for moving the link element angularly about the axis bearing being a handle extending upward from the connection of the link element to the beam, the handle being in axial alignment with the angularly movable connection of the link element to the beam.

Claim 9

The apparatus described in claim 5 characterized by means for adjusting the length of the beam between the center points of the scriber and the connection of the link element with the beam.

Claim 10

The apparatus described in claim 5 characterized by the beam being slotted throughout substantially its entire length to provide the sliding movement of the beam in the direction of its length with respect to the pivot and for the adjusTment of the connection of the link element along the length of the beam, and the scriber and the link element being on different sides of the pivot along the length of the beam.

Claim 11

The apparatus described in claim 5 characterized by a frame on which the axis bearing is supported, the link element comprising a disc with a center bearing that rotates on the axis bearing, a block that slides along a slot in the disc, said slot extending in a direction having a radial component, means for clamping the block at desired locations along the slot, the block being a part of the link element that connects with the beam, the disc and frame having a scale on one of them and a position indicator on the other for indicating angular positions of the disc, a base for placing on a support, the pivot being connected with the base as a unitary part thereof, the disc-supporting frame being located on the base and slidable along the base toward and from the pivot, guides on the base for the frame, scales along the guides for indicating the spacing of the axis bearing from the pivot as the position of the frame is adjusted along the guides, the beam being slotted throughout substantially its entire length to provide for sliding movement of the beam in the direction of its length with respect to the pivot and for the adjustment for the connection of the link element along the length of the beam, and the scriber and the link element being on different sides of the pivot lengthwise of the beam.

Claim 12

The apparatus described in claim 9 characterized by the scriber being located near one end of the beam and the scriber end of the beam projecting for a substantial distance from one side of the rest of the apparatus and over a work area larger than the area covered by the base and other parts of said rest of the apparatus.