Geometrical instruments – Straightedge type – Base attached
Patent
1982-10-13
1984-11-20
Martin, Jr., William D.
Geometrical instruments
Straightedge type
Base attached
33489, B43L 1302
Patent
active
044830815
ABSTRACT:
A head supporting device for moving a universal parallel ruler containing a head assembly and a scale in a vertical direction in planes substantially parallel to that of a drawing board which comprises a cursor-side link member, a head supporting link member for supporting said head assembly and scale, a support lever disposed between said cursor-side link member and said head supporting link member, one end portion of said support lever being pivotally attached to said cursor-side link member and the other end portion thereof being pivotally attached to said head supporting link member, thereby permitting vertical movement of the head supporting link member relative to said cursor-side link member and a spring member attached to said cursor-side link member and said head supporting link member for raising the head supporting link member relative to the cursor-side link member, said spring member acting upon the support lever to raise the head supporting link member when the pivot point of the support lever on said cursor-side link member falls below a straight line connecting the attachment points of the spring member to each of said link member.
REFERENCES:
patent: 3823479 (1974-07-01), Komabayashi et al.
patent: 4333245 (1982-06-01), Iseya et al.
Asahi Seimitsu Kabushiki Kaisha
Martin, Jr. William D.
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