Optics: measuring and testing – By alignment in lateral direction
Reexamination Certificate
2002-03-08
2004-09-21
Smith, Zandra V. (Department: 2877)
Optics: measuring and testing
By alignment in lateral direction
C356S138000, C356S614000
Reexamination Certificate
active
06795187
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a forklift in which when a load is to be loaded on a pallet or a rack, the pallet or the like is illuminated with a laser beam so that its position is visually recognized.
2. Description of the Related Art
In a conventional forklift using a laser light source, as shown in
FIG. 2
, a light spot projected onto a pallet
17
has a spot-like shape.
As described above, in an optical pallet detecting device using a laser light source, conventionally, a light spot projected onto the pallet
17
has a spot-like shape. As shown in
FIG. 2
, when the light beam impinges on an insertion hole
17
a
of the pallet
17
, therefore, a light spot
18
a
is not formed as indicated by a chain line
18
b
. When the light beam impinges on a gap between adjacent loads
19
, a light spot
23
a
is not formed as indicated by a chain line
23
b
. As a result, there arises a problem in that sight of the impinging position is not lost.
SUMMARY OF THE INVENTION
According to the invention, the problem is solved by a forklift in which a mast upstands in front of a body of the forklift, a lift bracket is mounted on the mast in a vertically movable manner, and a fork is engaged with the lift bracket, wherein a laser light source which illuminates an area in front of the fork is attached to the lift bracket or the fork, and a light beam emitted from the laser light source is formed into a shape which laterally elongates, via a lens.
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patent: 4279328 (1981-07-01), Ahlbom
patent: 4683493 (1987-07-01), Taft et al.
patent: 4815845 (1989-03-01), Colbaugh et al.
patent: 5208753 (1993-05-01), Acuff
patent: 6150938 (2000-11-01), Sower et al.
patent: 0 014 586 (1980-08-01), None
patent: 1 322 043 (1973-07-01), None
patent: 1 540 705 (1979-02-01), None
patent: 9183600 (1997-07-01), None
patent: 11-5700 (1999-01-01), None
Nippon Yusoki Co., Ltd.
Smith Zandra V.
Sughrue & Mion, PLLC
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