Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1995-02-06
1997-03-11
Underwood, Donald W.
Material or article handling
Vertically swinging load support
Shovel or fork type
414700, E02F 328
Patent
active
056094647
ABSTRACT:
A lift boom assembly including a pair of laterally spaced interconnected lift arms having a tool mounted between forward ends thereof. Each lift arm includes a main lift link having upper and lower connecting portions at a rear end thereof. A second lift link is pivotally connected to the upper connecting portion of the main lift link and partially controls movements of the respective lift arm. The opposite end of each second lift link is pivotally connected to a frame of a machine on which the lift assembly is mounted. Movement of the lift arms is further controlled by a pair of control arms. A lower end of each control arm is pivotally connected to the frame. When the boom assembly is in a lowered position relative to the frame, a second or upper end of each control arm extends upwardly and rearwardly from the lower end and is pivotally connected to the lower connecting portion of the respective main lift link. In response to vertical movements of the boom assembly between raised and lowered position, each control arm swings forwardly and rearwardly of its true vertical position to alter the movements of the lift arms and such that the tool is elevationally moved along a generally linear vertical path. A pair of extendable and retractable drivers provide powered vertical movements to the lift assembly and the tool carried thereby relative to the frame.
REFERENCES:
patent: 1863696 (1932-06-01), North et al.
patent: 2310284 (1943-02-01), Gurries
patent: 2345620 (1944-04-01), Mork
patent: 2372220 (1945-03-01), Mork
patent: 2849132 (1958-08-01), Clarke
patent: 2980271 (1961-04-01), Ulinski
patent: 3215292 (1965-11-01), Halls
patent: 3352441 (1967-11-01), Alden
patent: 3522898 (1970-08-01), Rotheisler
patent: 3586195 (1971-06-01), Beltrami
patent: 4122960 (1978-10-01), Bauer et al.
patent: 4318664 (1982-03-01), Gibert
patent: 4355946 (1982-10-01), Wykhuis et al.
patent: 4427334 (1984-01-01), Cople et al.
patent: 4636133 (1987-01-01), Hess
patent: 4699560 (1987-10-01), Ostermeyer et al.
patent: 5169278 (1992-12-01), Hoechst et al.
"No Mast on this Lift Truck . . . ", p. 77, Mechanisms, Linkages, and Mechanical Controls, by Nicholas P. Chironis (McGraw-Hill, 1965).
Moffitt John M.
Youngers Stephen A.
Case Corporation
Harbst John W.
Underwood Donald W.
LandOfFree
Lift boom assembly for a loader machine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Lift boom assembly for a loader machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lift boom assembly for a loader machine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-438601