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The mechanism described and illustrated in Fig. 1 is a pinion lock mechanism that provides speed and ease of adjustment with necessary locking feature in either direction.
English (United States)
This text was extracted from a PDF file.
100% of the total text.
Page 1 of 1
Pinion Leg Lock Mechanism
The mechanism described and illustrated in Fig. 1 is a pinion lock mechanism
that provides speed and ease of adjustment with necessary locking feature in
Stud 1 is locked on a stationary part 2 of the machine and holds a free to
pivot knob 3, having two pins 4.
Grooves 5 in leg 6 are cut deeper toward one end so that rollers 7 will be free
at the deeper end, but will wedge tightly toward the center at the shallow end.
The rollers 7 are backed up by blocks 8 and springs 9. The wedging action in the
two grooves takes place in either direction for the leg 6 about axis A.
The knob is free to pivot on the stud 1 which carries pins 4 which project into
the grooves 5. There is a slight clearance between pins 4 and rollers 7, so the
knob 3 will have a small amount of free movement. When the knob is moved in
either direction the pin 4 contacts the roller 7 eliminating wedging action on that
side. Wedging action on the other side only takes place in the opposite direction,
so leg 6 is free to rotate with knob 3. Identical results occur in the opposite
When knob 3 is released, wedging action of both rollers again lock leg 6
about axis A.
Since leg 6 is rotated and locked in either direction, an infinite number of
positions are available.