Geometrical instruments – Straight-line light ray type – Alignment device
Reexamination Certificate
2000-12-22
2002-10-29
Gutierrez, Diego (Department: 2859)
Geometrical instruments
Straight-line light ray type
Alignment device
C033SDIG002
Reexamination Certificate
active
06470579
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to level and position indicating devices for use in construction, and more particularly to a level and position indicating device adapted for use in ceiling and roof construction.
2. Description of Related Art
The following art defines the present state of this field:
Dong, U.S. Pat. No. 5,864,956 describes a combination of square alloy rulers with precisely machined planes, each ruler unit having two 1.5v batteries and two bubble levels to level in all directions. A line generator is mounted in front of a laser diode module. This basic laser line ruler unit can produce an accurate laser level line or plumb line after it is calibrated. By adjusting the calibrating knob, the laser line ruler will produce a precise level line or plumb line when the level bubbles are centered. Putting a properly aligned level line unit and a properly aligned plumb line unit together will produce a cross line in front of the combination. Adding at least one more laser line ruler, that is combining three or more line units, will produce 90 degree lines, 45 degree lines, and 180 degree lines, as well as 270 degree lines up and down or on the right and left sides by simply adjusting the position of the relevant ruler. The housing of the ruler position of the relevant ruler. The housing of the ruler unit is machined with accurate planes and vertical angles. Therefore, the combination of several rulers can project accurate level lines, vertical lines, 45 degree lines, 90 degree lines, etc. This simple, small, and unique ruler combination is affordable to the public and can be widely used in hardwood layout and cutting, carpet cutting, squaring the surfaces of any plane object, etc. in addition to its usage in construction.
Ting, U.S. Pat. No. 5,842,282 describes a laser angle adjustment device for laser measuring instruments including a rectangular casing, a fixed bubble level and an adjustable bubble level mounted on the casing at right angles, a barrel turned in a hole in the casing, a top cover fixedly fastened to the barrel at one end to hold a laser module for providing a laser reference line for measurement.
Ohtomo et al., U.S. Pat. No. 5,819,424 describes an invention providing a laser leveling device, which comprises a light emitting unit for irradiating a laser beam, a rotating unit for rotating the laser beam for scanning, and a means for turning off the scanning laser beam so that a spot-like is formed in a specific direction. By forming a reference spot light, and aligning an irradiating point of the spot beam with the reference point, it is possible to install the laser leveling device to the reference point and to perform accurate positioning of the laser leveling device by the scanning line of the laser beam formed on a portion other than the spot.
Cupp, U.S. Pat. No. 5,604,987 describes a support for a laser beam generator in a carpenter's level is positioned on the level so that the laser beam generated will lie in the plane of a flat reference surface of the level. A battery or other power supply is housed in the carpenter's level together with circuitry to connect the power supply to the laser beam generator and preferably a switch allowing the generator to be turned off and on. Gauges may be employed in the level for vertical, as well as horizontal may be included. Such a gauge may be a commercial gauge such as an inclinometer. Preferably, however, a conventional gauge employing an arcuate tube filled with liquid having a bubble in it which seeks the highest level of the tube with calibration marks for accurately positioning the bubble. Such a gauge rotatably supported, but frictionally held in a selected position relative to the level enables a selected angle for the reference surface to repeatedly be used even without calibration. With calibration, it enables a selected angle relative to horizontal to be set from the calibrations so that the reference surface may be oriented at the set angle when using the level.
Breda, U.S. Pat. No. 5,566,459 describes a laser beam device that performs sightings and tracings which make use of a calibrated tube inside which resides a laser emitting component of which the optical emitting axis coincides with the mechanical axis of the tube, a mirror securely mounted at the end of the tube and set at a 45 degree angle from the incident laser beam, an end piece mounted and rotating on the end of the tube which includes a number of ports which can be brought to be coaxially centered in the reflected beam by simply rotating the end piece and a number of optical systems respectively mounted in the ports. The device provides flexibility without requiring additional set-up.
Huang, U.S. Pat. No. 5,495,675 describes a laser sight including a mounting base fixed to the bow back of a bow, a first holder frame fastened to the mounting base and adjusted in the X-axis direction, a second holder frame fastened to the first holder frame and adjusted in the Y-axis direction, a third holder frame fastened to the second holder frame and adjusted in the Z-axis direction and having a sight blade, and a laser module fastened to a swivel laser module holder on the third holder frame, wherein the swivel laser module holder is fastened to the third holder frame by an adjustment screw and can be turned about the adjustment screw to adjust the angle of inclination of the laser module for allowing the laser beam from the laser module to be aimed at a target when the sight blade is aligned with the target.
Rando et al., U.S. Pat. No. 5,459,932 describes an automatic plumb, level and pointing tool uses a visible laser diode to project light beams in two modes through two windows, In the first mode of operation, the unit is able to project a plumb-up beam and a level beam of light while resting on a surface which is as much as five degrees out of level. In the second mode of operation the unit is able to project two orthogonal beams of light both approximately in the horizontal plane for aligning one or more reference lines. An accurate, low cost method of generating level and plumb beams and planes of light is disclosed. One method uses an approximately leveled platform combined with a weak optical correction. The approximate leveling is done using a single wire or coil spring pendulum element which allows the platform to level itself to within a small fraction of true level, and remaining correction is provided by a weak negative lens or a weak reverse telescope. In alternative embodiments, all leveling is accomplished using a very flexible coil spring as a pendulum element, or a chain-link connection in combination with such a spring. Several accessories are disclosed for use with the laser tool.
Rando, U.S. Pat. No. 5,182,863 describes an automatic plumb, level, pointing and distance measuring tool uses a visible laser diode to project a beam in any of several different modes through a beam exit window. The tool, approximately the size and shape of a tape measure, can be placed on the edge to project a tilt-compensated vertical beam. Placed on another edge 90 degree rotated, the tool projects through the same exit window a tilt-compensated vertical beam. When laid on either of its larger flat sides, the tilt compensation becomes inoperative and the tool projects a beam, which is fixed relative to the housing. Acoustic distance measurement is facilitated using a second component or target side device, which is activated to send an acoustic signal across a space to be measured, toward the laser tool. A receiver in the laser tool detects arrival of the acoustic signal and causes the laser to project a characteristically modulated or pulsed beam, received at a photo-detector on the target side device. The acoustic transit time is clocked and distance is calculated and displayed. The use of a single acoustic transit time, without reflection increases distance-measuring range. Also, the visible laser beam projected between the two components provides a clear visual indication of the d
Gene Scott-Patent Law & Venture Group
Gutierrez Diego
Hayleck Ryan T.
LandOfFree
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