Pantograph

Claim 1

A pantograph comprising: a support having a pair of substantially coextensive support boards of rectangular outline, and means hingedly interconnecting said support boards along confronting edges thereof whereby said support boards may be spread into coplanar relationship to define a pair of support surfaces on the same side of said support. a plurality of articulated bars forming a pantograph assembly pivotally mounted on one of said support boards along said support surfaces and having a stylus adapted to course along an outline on said one of said support boards, and a drawing instrument adapted to course along a geometrically similar outline on the other of said support boards; and a transparent overleaf hingedly mounted on said surface of said one of said support boards and defining an image field thereon whereby a master image is receivable beneath said overleaf for tracing by movement of said stylus upon said overleaf, said assembly comprising a pedestal member anchored to said one of said support boards, a first bar member swingably mounted on said pedestal member at a first pivot, a relatively long bar member articulated to said first bar member at one extremity of said long bar member at a second pivot, a second bar member articulated to said long bar member by a third pivot at an intermediate location along said long bar member, and a third bar member articulated by a fourth pivot to an intermediate location of said first bar member and by a fifth pivot to an intermediate location of said second bar member, said second bar member being provided at a free end with said stylus and said long bar member being provided at a free end with said instrument, each of said pivots comprising a generally cylindrical boss on one of the members thereof, a bore formed in the other member of the respective pivot and rotatably receiving the respective boss, and a pin snugly fitted into the respective boss and having a head of a diameter greater than that of said cylindrical boss, said free end of said long bar member being bifurcated to snugly retain said instrument and said free end of said second bar member being provided with a socket snugly retaining said stylus, said pin at one of said second, third, fourth and fifth pivots being elongated beyond the members constituting same for engagement with said surface of said one of said support members.