Tool support assembly with bidirectional position control

A tool support assembly with a bi-directional position control, comprising:

• A. a housing defining an interior channel extending along an axis,
• B. a tool support element positioned within said channel and movable in said channel along said axis, and
• C. a bidirectional positioning assembly coupling said tool support element and said housing, including:
• i. at least one detent element affixed to said housing, said detent element including at least one detent extending transverse to said axis and facing said channel,
• ii. a latch element captively positioned within said channel and selectively movable along said axis, said latch element including at least one lock arm resiliently biasable toward and for selectively engaging at least one of said detents,
• iii. a control element captively positioned within said housing and movable relative to said housing along said axis,
• wherein said latch element and said control element cooperate whereby:
• a. in response to substantially no force F applied to said control element relative to said housing and when at least one of said lock arms is engaged with one of said detents, said tool support element is fixedly positioned relative to said housing, and
• b. in response to a force F applied to said housing in a first direction along said axis, said lock arms disengage said at least one of said detents and said tool support element moves relative to said housing in said first direction, wherein said latch element and said control element further cooperate whereby in response to a force F applied to said control element relative to said housing in a second direction along said axis, said second direction being opposite to said first direction, said lock arms disengage said detents and said tool support element moves relative to said housing in said second direction, and
• wherein said bidirectional positioning assembly includes a first detent element on a first side of said channel and a second detent element on a second side of said channel, said second side being opposite said first side, and each of said first and second detent elements including a linear array of detents extending along said axis and facing said channel, and
• wherein said latch element includes first and second lock arms, said first lock arm being resiliently biasable toward and for selectively engaging one of said detents of said first detent element, and said second lock arm being resiliently biasable toward and for selectively engaging one of said detents of said second detent element.