Sidewalk lifter

Details Sidewalk lifter Sidewalk lifter

1988-09-16

1991-01-08

Spar, Robert J.

Implements or apparatus for applying pushing or pulling force

Single throw lever

Mechanically actuated

254DIG1, 254131, B66F 300

Patent

active

049829300

ABSTRACT:
A device for realignment of sidewalk sections displace by settling or tree root lifting, where a hazardous step exists at a joint or crack. A rigid beam is laid longitudinally on the sunken section, with cross beams reaching to the section sides. Hooks are suspended from the ends of the cross beams, and hooked under the edges of the slab. The hooks are shaped for stability, not requiring clamping on, or boring into, the slab. A jack lifts one end of the main beam, raising the hooks, and lifting one end of the slab, with evenly distributed force to avoid cracking the concrete. Fill-dirt is thrown under the raised section to restore vertical alignment. The device is operable by one person. It pivots the slab in a vertical plane, guiding accurate return to position.

REFERENCES:
patent: 662342 (1900-11-01), Berry
patent: 684426 (1901-10-01), Harvey et al.
patent: 2297556 (1942-09-01), Hermann
patent: 2353381 (1944-07-01), Allderige
patent: 2846259 (1958-08-01), Sadler
patent: 3161309 (1964-12-01), Baudhuin et al.
patent: 3861649 (1975-01-01), Mosley
patent: 4261548 (1981-04-01), Kaderabek
patent: 4368869 (1983-01-01), Gelvezon et al.
patent: 4482182 (1984-11-01), Mortensen
patent: 4681300 (1987-07-01), Drugge

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