Implements or apparatus for applying pushing or pulling force – Hoisting truck – Single throw lever
Reexamination Certificate
2001-05-08
2002-04-23
Hail, III, Joseph J. (Department: 3723)
Implements or apparatus for applying pushing or pulling force
Hoisting truck
Single throw lever
C254S13300A, C254SDIG004
Reexamination Certificate
active
06375160
ABSTRACT:
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to a garage jack and, more specifically, to a jack board assembly for the jack lift of a garage jack, which comprises a jack board. and an anti-skid pad mounted in the jack board and defining with the jack board an air chamber. The anti-skid pad having air vents for exhaust of air from the air chamber when compressed by the load put on it.
(b) Description of the Prior Art
The jack board
10
of a conventional garage jack, as illustrated in
FIG. 1
, is a circular member comprising an upward peripheral flange
101
, and a rubber cushion
20
is mounted on the
15
upward peripheral flange
101
. The rubber cushion
20
is an annular rubber member having an annular bottom mounting groove
201
, which receives the upward peripheral flange
101
. Because the rubber cushion
20
covers on the peripheral area of the topside of the jack board
10
, the load tends to slip when lifting.
SUMMARY OF THE INVENTION
The present invention provides a jack board assembly, which eliminates the aforesaid problem. According to one aspect of the present invention, the jack board assembly comprises a jack board having a top recess and top blocks around the top recess, and an anti-skid convex pad mounted in the top recess of the jack and defining with the top recess an air chamber, the anti-skid convex pad having a plurality of air vents for exhaust of air from the air chamber when compressed by the load put on it. According to another aspect of the present invention, the jack board can be made having circular, rectangular, or triangular shape, or any of a variety of shapes, and the anti-skid pad has a shape fitting the shape of the jack board. According to still another aspect of the present invention, the friction top sidewall of the anti-skid convex pad has an embossed pattern comprising a plurality of raised portions.
REFERENCES:
patent: 3993286 (1976-11-01), Greene et al.
patent: 4688759 (1987-08-01), Gray
patent: H1823 (1999-12-01), Wolford
patent: 6109593 (2000-08-01), Craychee
Shinn Fu Corporation
Varndell & Varndell PLLC
Wilson Lee
LandOfFree
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