Drawing instrument

Details Drawing instrument Drawing instrument

B - Operations, Transporting

43

L

33/28

B43L 9/02 (2006.01) B43L 9/20 (2006.01) B43L 9/24 (2006.01)

Patent

CA 1068897

ABSTRACT OF THE DISCLOSURE In a drawing instrument, in the form of drawing compasses or dividers, having a die-cast leg and a die-cast arm, or two die- cast legs, pivoted together at inner ends thereof and having a bow top having fork limbs embracing the assembly of pivoted ends of the leg and arm or of the two legs, and there being provided a central- ising member held between, and keyed by die-cast keying means to, the pivoted-together inner ends of the leg and arm, or of the two legs, the bow top is preferably of plastics material and has stop means engageable with the inner ends of the leg and the arm, or of the two legs, whereby to act against angular opening-out movement of the leg, or the one leg, relatively to the arm, or the other leg, beyond a pre-determined angular limit, and the said stop means on the bow top are so located that if the instrument is opened out to the predetermined angular limit the said stop means on the bow top take at least part of the shock or strain resulting from said opening-out to the angular limit. The keying means for keying the centralising member may comprise two die-cast keying projections engageable with respective arcuate recesses, and the aforesaid stop means on the bow top may be so located that, on opening out the instrument, the two die-cast projections cannot bear against the ends of the respec- tive arcuate recesses before the said stop means on the bow top bear against the inner ends of the leg and arm, or of the two legs.

282660

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