Laser level with lens switching mechanism

Geometrical instruments – Straight-line light ray type – Alignment device

Reexamination Certificate

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Details

C033S451000, C033SDIG002

Reexamination Certificate

active

06763598

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a laser level, more particularly one, which is equipped with a lens switching mechanism to be convenient to use.
2. Brief Description of the Prior Art
Referring to
FIG. 6
, a conventional laser level includes a rectangular bar
60
, a level vial
70
mounted on top of the rectangular bar
60
, a fixing base
62
joined to a front end of the bar
60
, and a laser module
61
disposed in the bar
60
. A lens
63
is secured to the fixing base
62
such that laser light from the laser module
61
can project to outside through the lens
63
. The level vial
70
includes a sealed tube
71
, liquid
72
in the tube
71
, and an air bulb
73
in the tube
71
for checking that a surface is horizontal.
The lens
63
can be flat, horizontal corrugated or vertical corrugated on the surface, which can make laser light of the laser module
61
form a light dot, a horizontal light line or a vertical one onto a target respectively.
To use the laser level, a portion of an object to be checked out is made flatter, and then the laser level is positioned on the portion of the object to check that the surface is level, i.e. that the laser level is positioned horizontal. Thus, laser light from the laser module
61
projects through the lens
63
onto a target to form a reference light mark on the target for indicating a portion of the target that is as high as the horizontal surface of the above object.
To project a reference laser dot onto the target, the user has to use a laser level of the kind, to which a flat lens is fitted; to project a horizontal laser line onto the target, the user has to substitute another laser level, to which a horizontal corrugated lens is fitted, for the original one, and the user has to use yet another laser level instead, to which a vertical corrugated lens is fitted, for projecting a vertical laser line onto the target.
From the above description, it can be easily understood that the conventional laser level has disadvantages as followings:
1. The user has to prepare and carry three laser levels, which are respectively equipped with flat, horizontal corrugated, and vertical corrugated lenses, causing inconvenience and costing more money.
2. Every time after the user switches from one level to another on the same target, he has to recheck that the level is positioned horizontal, causing inconvenience to him.
SUMMARY OF THE INVENTION
It is a main object of the present invention to provide a laser level, which is equipped with a lens switching mechanism capable of being used for easily and conveniently switching from one of various kinds of lenses to another.
The laser level includes a shell, a level vial fitted to top of the shell, a laser module disposed in the shell, a connecting base joined to the front end of the shell, and a lens switching knob joined to the base; the connecting base has a first hole right in front of a passage formed in the shell for allowing laser light of the laser module to travel through; the base has a second hole; the knob has different lenses fitted around a shaft, and is turnably joined to the base with the shaft thereof being passed through the second hole of the base.


REFERENCES:
patent: 5359779 (1994-11-01), Polk et al.
patent: 5367779 (1994-11-01), Lee
patent: 5836081 (1998-11-01), Orosz, Jr.
patent: 6183129 (2001-02-01), Aoyama et al.
patent: 6280082 (2001-08-01), Aoyama et al.
patent: 6314651 (2001-11-01), Ohtomo et al.
patent: 6427348 (2002-08-01), Webb
patent: 6588115 (2003-07-01), Dong
patent: 6694630 (2004-02-01), Dang et al.
patent: 2002/0073561 (2002-06-01), Liao
patent: 2002/0166249 (2002-11-01), Liao

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