Side shift fork adjustable carriage
AssigneeTowmotor Corporation
InventorJerry L. Reeves
Life of this patent
Estimating the term…
Abstract
A material handling device such as a lift truck (10) includes a pair of material handling forks (16,18) mounted on a carriage (22) that is movable upwardly and downwardly on a mast (14) by a hydraulic lift cylinder (104). The material handling forks (16,18), which are usable to pick up, transport, and deposit articles, must be positioned properly under the article. A hydraulic system (102) is included with tracks (22,24) mounted on the carriage (20) to permit selective transverse movement of the forks (16,18) on the carriage (20) from an abutting position to a fully extended position. The hydraulic circuit (102) is pressure responsive to the pressure in the lift cylinder (104).
Claims16
In a material handling vehicle (10) having a mast (14), a carriage assembly (12) connected to the mast (14) for vertical movement thereupon and first and second load lifting forks (16,18) each having a side, the improvement comprising:
- track means (22,24) for movably connecting said forks (16,18) to the carriage assembly (12) for movement of the forks (16,18) between a first position at which respective sides of each fork are in contact with one another and a second position at which the respective sides of each fork (16,18) are spaced one from the other, said track means (22,24) including a first (22) pair of tracks having first (22a) and second (22b) spaced apart tracks each connected to the carriage assembly (12) in a generally horizontal plane, said horizontal plane generally perpendicular to the vertical movement of the carriage assembly (12) and first (26) and second (28) sliding bars each having inner end portions (26a,28a) and being connected to a respective fork (16 or 18) and slidably connected to a respective track (22a or 22b), said forks (16,18) being oriented substantially perpendicularly relative to the tracks (22a,22b) and said sliding bars (26,28) each having a length (L) sufficient for maintaining said forks (16,18) substantially perpendicular relative to the track (22a or 22b) and said tracks being positioned one relative to the other at locations sufficient for overlapping of the inner end portions of sliding bars at the first position of the forks (16,18).
A carriage assembly (12) for a material handling vehicle (10) having a mast (14) comprising:
- a carriage assembly (20) connectable to the mast (14) for vertical movement thereupon;
- first (16) and second (18) load lifting forks each having a side;
- track means (22,24) for movably connecting said forks (16,18) to said carriage (20) for movement of the forks (16,18) between a first position at which said respective sides of each fork (16,18) are in contact with one another and a second position at which said forks (16,18) are spaced one from the other, said track means (22,24) including a first (22) pair of tracks having first (22a) and second (22b) spaced apart tracks each connected to the carriage assembly in a generally horizontal plane, said horizontal plane generally perpendicular to the vertical movement of the carriage assembly (12);
- said first (26) and second (28) sliding bars each being connected to a respective fork (16,18) and slidably connected to a respective track (22a or 22b) so that with said respective sides of said forks (16,18) in contact with one another a portion of said sliding bars (26 and 28) are in an overlapping relation;
- and
- horizontal power means (102) for selectively moving each of said forks (16,18) along said track means (22,24).
Dependencies are inferred from the claim text.