Mechanical guns and projectors – Element – For archery projector
Patent
1980-01-28
1982-07-20
Pinkham, Richard C.
Mechanical guns and projectors
Element
For archery projector
124 23R, 124DIG1, F41B 500
Patent
active
043400256
ABSTRACT:
An archer's compound shooting bow has rigging cables and pulleys arranged to eliminate torque on the limbs when the bow is fully drawn and to permit an arrow to fly true past the rigging when the bow approaches its rest condition. Each pulley has two grooves receiving an adjacent rigging cable. The grooves have variable separation at different locations along the pulley rim. Each pulley is mounted on a limb alongside the opposite rigging cable dead end. As to each limb, the connection of the opposite cable dead end and the location of the adjacent cable tensions are arranged, in respect to their magnitudes at full draw, to apply no net torsional moment to the limb about its torsional axis.
The separation between the pulley grooves corresponding to the rest condition permits arrow feathers to pass the rigging cables without contact, which is not true at full draw. The groove for the shooting string is normal to the pulley rotational axis. The other groove is substantially helical to the first groove.
The pulley is ring-shaped and is fabricated from an extrusion having an annular cross section.
REFERENCES:
patent: 4054118 (1977-10-01), McKee et al.
patent: 4064862 (1977-12-01), Groner
patent: 4079723 (1978-03-01), Darlington
patent: 4185374 (1980-01-01), Shepley
patent: 4187826 (1980-02-01), Killian
patent: 4261320 (1981-04-01), Barna
Browne William R.
Pinkham Richard C.
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