Cutting by use of rotating axially moving tool – Processes – Bit detachable
Patent
1995-09-29
1997-09-16
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Processes
Bit detachable
408 16, 408113, 408712, B23B 4514
Patent
active
056673450
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a method and device for controlling and manipulating one or more parallel reference planes for use in the continuous alignment of hand-held tools.
BACKGROUND ART
When using hand-held drilling machines it is very difficult to see and control the drilling direction. Thus the result often becomes more or less slanting holes that make mounting difficult and the result ugly. Also in other cases, as erecting posts, fences and door frames, brick laying and similiar works problems of making the construction right occur. The problems are often of the art that one, for instance when drilling, must be able to adjust the direction during ongoing operation.
The implements for direction control in use still to-day are mainly the same as in older times and based upon set squares, plumb-lines, levels and similiar utensils. The problems and detriments that accompany those primitive methods are well known. They are useless for continous control. They often demand helpers and do not give possibility of control in more than one direction.
SUMMARY OF THE INVENTION
The present invention is aimed at solving the problem and concerns a new principle to observe and with security continously control direction in more than one plane, without eye movement, by using an optical system of mutually parallel reference lines and two slanting, reflecting, plane surfaces.
The system does not require special lighting above the normal one and may be designed either free-standing and independent of the machine used or as an easily mount- and demount-able accessory part to the machine. It may be used not only for horisontal and vertical erections, but also for erections with arbitrary angles against the horisontal and vertical planes. The optic is simple and does not contain any optically active, curved surfaces, i.e. no spherical lenses, spherical mirrors or like things. It is in principle parallax-free and has modest demands on eye position, which otherwise can be a problem at the use of optical systems.
The method according to the invention implays producing one or more with the intended direction parallell reference lines and letting the reference lines and the object, the direction of which is to be controlled, be imaged in one or more plane reflecting surfaces.
Usually one wishes to control direction in more than one plane. For this is needed at least two plane reflecting surfaces. To make it possible to see, simultanously, the images in more than one reflecting surface the surfaces have to form angles with each other. Further if one wishes to be able to see the images from an eye position close behind for instance a drilling machine the reflecting surfaces have to be slanting. The greatest precision is obtained if the angle between the base lines of the reflecting surfaces is right or nearly right, but other angles may be used if they from design or product technical reasons bring advantages that surpass the relatively small loss of precision.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1 and 2 show the principles of a device according to the invention.
FIG. 3 is a sketch of the essential features of a preferred example of the invention.
FIG. 4 is an especially preferred design, where the implement has been designed with a corner piece (16) and provided with a backing band to eliminate visual disturbances from the environment.
FIG. 5 is an alternative design, which may be better from the manufacturing point of view, but less preferred, if the main aim is highest possible precision.
FIG. 6 shows a preferred design that makes control at oblique direction possible.
FIG. 7 shows a design of the implement according to FIG. 6 intended for mounting at a hand-held drilling machine.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The example of the invention shown in FIG. 3 can be described as two units (1) and (2) coupled, or able to be coupled, to each other at right angle. The implement is placed on or attached to the actual surface with the working point approximately symmetric between (1) and
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Howell Daniel W.
Tsai Henry W. H.
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