Work holders – Holder mounted for movement – Including means to shift holder position
Patent
1983-02-07
1985-01-08
Watson, Robert C.
Work holders
Holder mounted for movement
Including means to shift holder position
269905, B23Q 318
Patent
active
044923694
ABSTRACT:
A door lifting and centering device for hanging heavy doors comprising a base plate, a lift plate positioned above the base plate having a jack screw member threaded through an internally threaded portion of the lift plate whereby the lift plate is raised relative to the base plate when the jack screw member is rotated. The lift plate includes projecting fingers which extend forwardly to be inserted under the bottom edge of a heavy door which is to be hung in a door frame. The jack screw member includes an elongated shank which extends upwardly to waist height of the installer or other convenient height whereby the installer does not have to stoop in order to rotate the jack screw. He can remain upright whereby he is able to see the holes in the door hinges and properly align them with the corresponding holes in the door jamb or door frame, while at the same time rotating the jack screw causing the door to slowly lift until he can see that the apertures in the hinge and in the door frame are properly aligned. A convenient knob or handle is attached to the upper end of the elongated shank of the jack screw to enable the installer to easily rotate the jack screw. The lift plate is connected to the base plate such as by a hinged connection at the end of the lift plate opposite the projecting fingers.
REFERENCES:
patent: 472200 (1892-04-01), Seiler
patent: 1051633 (1913-01-01), Price
patent: 1228805 (1917-06-01), Morris
patent: 2503388 (1950-04-01), Hedlund
patent: 2568289 (1951-09-01), Morey
patent: 3876096 (1975-04-01), Latek
patent: 4141192 (1979-02-01), Augustine
Kettelson Ernest
Watson Robert C.
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