B - Operations – Transporting – 66 – F
Patent
B - Operations, Transporting
66
F
242/59.2
B66F 3/00 (2006.01) B65H 49/38 (2006.01) B65H 75/02 (2006.01) B66F 15/00 (2006.01) B66F 19/00 (2006.01)
Patent
CA 1088487
ABSTRACT OF THE DISCLOSURE A manually operable lifting mechanism is disclosed which has, in one preferred form, a supporting frame having a horizontal base portion provided with an upright portion and a horizontal supporting arm portion secured at one end to the upper end of said upright portion to overhang said base portion. A manually operable lifting lever is pivotally connected at one end to the outer end portion of said supporting arm portion for swinging movement between first and second positions. A load-lifting arm is pivotally connected at one end to said upright portion near said supporting arm portion to extend substantially horizontally. The lever has a first link portion at its pivoted end extending substantially at right angles thereto. A second link is pivotally connected between said lever at the angle formed with the first link portion and the pivoted arm. The pivot connection between the second link and the pivoted arm is near the distal end of the latter whereby the moment arm of the pivoted arm between said upright portion and the pivot connection is longer than the moment arm of the link portion between the. pivot connection at said angle and the connection of said pivoted arm to the supporting arm portion. The pivoted arm extenas substantially parallel to the lifting lever. The first link portion and the second link lock overcenter when the lifting lever is moved to its first position and unlock when the lever is moved to its second position.
305443
Mossberg Hubbard (a Division Of Wanskuck Company)
Smart & Biggar
LandOfFree
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