U.S. patent number 3,728,027 [Application Number 05/105,457] was granted by the patent office on 1973-04-17 for portable magnetic boring machine having light beam centering device.
This patent grant is currently assigned to Nitto Giken Kabushiki Kaisha. Invention is credited to Takashi Watanabe.
United States Patent |
3,728,027 |
Watanabe |
April 17, 1973 |
PORTABLE MAGNETIC BORING MACHINE HAVING LIGHT BEAM CENTERING
DEVICE
Abstract
Portable apparatus for centering a boring machine by indicating
a position to be perforated by means of projected light, the drill
being aligned with the projected light. The apparatus is located
relative to the workpiece by a magnetic element carrying the boring
device.
Inventors: |
Watanabe; Takashi (Naka-ku,
Nagoya-shi, JA) |
Assignee: |
Nitto Giken Kabushiki Kaisha
(Tokyo, JA)
|
Family
ID: |
11563173 |
Appl.
No.: |
05/105,457 |
Filed: |
January 11, 1971 |
Foreign Application Priority Data
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Jan 13, 1970 [JA] |
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45/3644 |
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Current U.S.
Class: |
356/13; 33/286;
353/28; 356/153; 356/399; 362/89; 408/16; 408/76 |
Current CPC
Class: |
B23Q
17/24 (20130101); B23B 49/00 (20130101); Y10T
408/21 (20150115); Y10T 408/554 (20150115) |
Current International
Class: |
B23Q
17/24 (20060101); B23B 49/00 (20060101); G01h
011/26 () |
Field of
Search: |
;240/2MT ;33/46AT
;356/172,138 ;408/16,76 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
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|
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316,055 |
|
Nov 1919 |
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DD |
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963,884 |
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Jul 1964 |
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GB |
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Other References
Spot Welds, Right on the Beam, Westinghouse Engineer, March 1944,
pp. 58-59..
|
Primary Examiner: Wibert; Ronald L.
Assistant Examiner: Godwin; Paul K.
Claims
I claim:
1. A portable magnetic boring machine having a centering device,
said boring machine comprising:
a main body (101) having a front side;
a vertically movable member (102) movably mounted on the front side
of the said main body (101) ;
a portable boring device (103) provided with a boring bit (106),
said boring device being connected to said vertically movable
member (102) ;
means (107) for vertically moving said vertically movable member
(102) and said boring device (103) ;
a magnetic base (110) at the lower end of said body (101) to
magnetically fix said boring machine on a magnetic sheet (111),
said magnetic sheet (111) having a magnetic surface (112) in a
given plane;
a centering light projector (113) carried by said main body (101)
and projecting a generally cross-shaped light beam on said magnetic
surface (112), said light projector (113) including a single
housing (152;176) ; a source of light (153,154;172) having a pair
of light emitting filaments (155,156;173,174) angularly arranged
with respect to each other, and mounted in said housing (152;176) ;
and lens means (157,158;175) mounted to said housing for adjustably
focusing the light emitted from said filaments into a cross-pattern
on an extended line of the boring axis of said boring machine to
define a boring point; and
said main body being slideably movable relative to said magnetic
surface (112) in a direction in the plane of said magnetic surface
(112) to locate the boring point, said main body being coupled to
said magnetic surface by the magnetic attraction of said magnetic
base (110) .
2. Apparatus as claimed in claim 1, including means for releasably
securing the light projector to said main body.
3. Apparatus as claimed in claim 10, wherein the housing of the
light projector is non-linear and includes a mirror therein to
reflect the light through the housing.
4. Apparatus according to claim 1 wherein said boring machine is a
drilling machine.
5. Apparatus according to claim 1 wherein said main body is
slideably movable relative to said magnetic base to locate the
boring point.
6. Apparatus according to claim 1 wherein said magnetic base is
slideably movable relative to said magnetic surface to locate the
boring point.
7. Apparatus according to claim 6 wherein said main body is further
slideably movable relative to said magnetic base to locate said
boring point.
8. Apparatus according to claim 1 wherein the position of said
light projector on said main body is adjustable to locate the focus
of said light beam on the extended line of the boring axis of the
boring machine to define the boring point.
9. Apparatus according to claim 1 including means for electrically
magnetizing said magnetic base after centering to effectively fix
the boring machine in the centered position.
10. Apparatus according to claim 1 wherein said source of light is
a single electric bulb (172) having a pair of crossed filaments
(173,174) therein for emitting a generally cross-shaped light
beam.
11. Apparatus according to claim 1 wherein said source of light
comprises a pair of electric light bulbs mounted in said housing,
said light bulbs having substantially linear filaments which are
substantially perpendicular to each other, and wherein said lens
means includes a pair of individually adjustable lenses
respectively focusing the light from each of said electric bulbs
for focusing the light emitted from said electric bulbs into said
cross-pattern.
12. Apparatus according to claim 11 wherein said housing includes a
partition between said two electric bulbs.
13. Apparatus according to claim 1 wherein said light emitting
filaments are substantially arranged at right angles.
Description
FIELD OF THE INVENTION
The present invention relates to apparatus for centering for use in
boring machines.
An object of this invention is to provide a method of centering for
boring machines, which facilitates easy and rapid centering
operations.
Another object of this invention is to provide light projectors for
centering.
SUMMARY OF THE INVENTION
According to the present invention there is provided a centering
apparatus for use in a boring machine comprising a light projector
carried on a boring machine, means for focusing light provided by
the projector on to a surface to be perforated, a boring unit
carried on the boring machine and movable vertically relative to
the boring machine, magnetic means for adjusting the position of
the light projector and boring unit so that the projected light can
be focused at a point on a surface to be perforated which point is
intersected by an extension line of said boring unit.
BRIEF DESCRIPTION OF DRAWINGS
The present invention can be more fully understood from the
following detailed description taken in conjunction with the
accompanying drawings in which:
FIG. 1 is a side view of a boring machine with magnetic board
provided with one embodiment of the present invention;
FIG. 2 is a cross-sectional view of a light projector for
centering, embodying the present invention;
FIG. 3 is a cross-sectional view of a modified type of a light
projector for centering;
FIG. 4 is a perspective view of a disc mounted between a plurality
of condensing lenses;
FIG. 5 is a cross-sectional view of another light projector for
centering, embodying the present invention;
FIG. 6 is a cross-sectional view of the light projector shown in
FIG. 5 taken along the line VI -- VI;
FIG. 7 is a cross-sectional view of still another light projector
for centering embodying the present invention;
FIG. 8 shows crossed filaments used in the embodiment shown in FIG.
7;
FIG. 9 shows diagrammatically electric circuits used for a boring
machine with a magnetic board; and
FIG. 10 is a side view of a floor boring machine, embodying the
present invention.
DESCRIPTION OF SPECIFIC EMBODIMENTS
The present invention will now be described in more detail with
reference to the accompanying drawings in which the same parts are
indicated by the same reference numerals.
FIG. 1 shows a boring machine with a magnetic base board consisting
of a main body 101, and a vertically movable member 102 which is
movably located on the front side of the said main body. A portable
boring machine 103 provided with a drill 106 is connected to the
said vertically movable member by supporting arms 104 and 105. A
handle 107 is pivoted to a side of the main body 101 to move
vertically the movable member 102 by rotating a pinion (not shown)
installed in the main body 101 and intermeshing with a rack 108
provided on the back surface of the movable member 102. A
supporting and moving wheel 109 is carried at the lower end of the
main body and a magnetic base board 110 is located underneath the
middle of the bottom of the main body 101. A steel sheet 111, which
is to be perforated has on its surface 112 a punch mark P. The
light projector for centering 113 has a switch 114 and a cord
115.
As shown in FIG. 2, the light projector for centering 113 is
provided with a light source 123 in a housing 122 provided with a
fitting means 121 for the main body 101 of the boring machine.
Projected light from the light source is reflected from the surface
of a mirror 124 and is focussed by a convex lens 126 provided in a
regulation cap 125 at the front of the housing 122.
As shown in FIG. 1, the boring machine with magnetic board 110 is
placed on the surface 112 of the material 111 to be perforated. The
light projector 113 is adjusted in such a way that the projected
light Y from the light projector 113 will focus at a point where an
extension line of the center of the drill 106 carried on the boring
machine 103 intersects the surface 112 of the material 111 to be
perforated. As shown in FIG. 2, this is effected by moving the
housing 122 of the light projector 113 and screwing or loosening
the regulation cap 125. Then the boring machine with a magnetic
board is moved so that the focus Z of the projected light Y may be
adjusted to be projected on the punch mark P provided on the
surface 112 of the material to be perforated. When the focus Z is
adjusted to the punch mark P, electric current is supplied to the
magnetic board 110 to magnetize the same and the boring machine 103
is fixed to the material to be perforated.
In this way, centering is very easily conducted, and such repeated
centering operations as are required in prior methods according to
which the end of the drill 106 is brought close to the punch mark P
by means of the handle 107 become unnecessary.
The boring machine with a magnetic board shown in FIGS. 1 and 2
must be moved on the surface of the material to be perforated 111
for the purpose of centering. On the other hand, in order to
conduct centering with a floor boring machine as shown in FIG. 10,
the material 133 to be perforated is clamped by a vice 132 provided
on a table 131 and is moved so that the focus Z of projected light
Y is aligned with a punch mark to be perforated on material 133.
The light projector 113 is adjusted in advance in such a way that
the projected light Y from the light projector 113 will focus at a
point where the extension line X of the drill 106 intersects the
surface 134 of the material to be perforated 133. When the same
material is to be perforated at many points in mass production,
centering is easily conducted by moving a material to be perforated
in such a way that the focus Z of the projected light Y is adjusted
to various punch marks and the material 133 is clamped with the
vice 132. Thus, with this boring machine, it is unnecessary even in
mass production to repeatedly conduct centering at every punch mark
by bringing the end of the drill 106 close to the punch marks
provided on the material to be perforated.
When the focus Z of the projected light Y is not perceptible
because centering is conducted outdoors, colored light may be
effectively used as a projected light. Moreover, the light
projector 113 may be used as a common illumination device by
removing the regulation cap 125 thereof.
As has been described so far, the present invention facilitates
easy and rapid centering for perforation by adjusting a focus of
the projected light from a light projector which is controlled
properly in advance to a punch mark provided on the surface of a
material to be perforated, instead of conventional operations for
centering by repeatedly bringing the end of a drill close to a
punch mark.
Any light projector may be used as a centering apparatus in the
present invention. The light projector shown in FIGS. 3 and 4 is
fixed to the main body of a boring machine and adjusted in such a
way that a projected light from the light projector will focus as a
cross at a point where the extension line of the drill intersects
the surface of a material to be perforated.
The light projector 141 shown in FIG. 3 comprises an electric bulb
123 installed in a housing 142. A movable body 146 provided with a
convex lens for condensing light 143 and a disc 145 having an
aperture in the shape of a cross is screwed to the inside of the
housing 142. A regulating cylinder 148 provided with a convex lens
147 is located at the end of the housing 142. The projected light Y
may be adjusted to focus at a point where the extension line X of
the drill 106 intersects the surface of material to be perforated
111 and the precise adjustment of the position of focus Z is
conducted by turning the regulating cylinder 148. The aperture in
the form of a cross 144 provided in the disc 145 serves to make the
focus Z of the projected light Y in a cross, which facilitates the
adjustment of the focus to a punch mark provided on the surface of
a material to be perforated.
When the drill 106 of a boring machine is to be aligned with a
punch mark P, the magnetic board 110 is moved to a proper position
and fixed or the main body 101 which is provided with a boring
machine 104 and mounted on the magnetic board 110 is adjusted, the
magnetic board being left as it is. In either way the projected
light Y is adjusted to the punch mark P.
In the rear part of the housing 152 of the light projector 151
shown in FIGS. 5 and 6, electric bulbs 153, 154 are installed in
such a way that the filaments thereof are provided perpendicularly
to each other. The housing 152 further comprises convex lenses 157,
158 mounted adjustably at the end of the housing 152, projecting
pieces 159, 160 which are fixed to the convex lenses 157, 158 and
project outwardly from the long slots 161, 162 provided on the wall
of the housing and a partition wall 163 to divide the inside of the
housing 152. The convex lenses 157, 158 are adjusted in such a way
that light from at least two electric bulbs which are provided in
such a way that the filaments thereof are perpendicular to each
other will cross each other by passing through the lenses. The
light from the electric bulbs 153, 154 is hardly darkened because
there is nothing in their way and the light crossed by passing
through the convex lenses results in a very light cross focus. As
the convex lenses 157, 158 provided with the projecting pieces 159,
160, projecting outwardly from the long slots 161, 162 of the
housing 152 respectively, are movably pivoted to each other, any
arbitrary pattern of focus of light is obtained by properly
operating the projecting pieces and adjusting the images of
filaments in arbitrary shapes.
The light projector shown in FIG. 7 facilitates the production of
light and distinct focus patterns of light in the form of a cross
with one electric bulb and an easy adjustment of the focus pattern.
Light projector 171 comprises an electric bulb 172 in which two
crossed filaments 173, 174 are provided as shown in FIG. 8 and a
cylinder 176 provided with a convex lens 175 adjustably mounted at
the end of the light projector 171. As the light source is in the
shape of a cross, a very distinct focus pattern in the shape of a
cross is obtained, on a material to be perforated, by adjusting the
light in the cylinder 176 provided with convex lens 175 without
reducing the intensity of radiation. Thus, a distinct and light
focus pattern in the shape of a cross is easily obtained with this
light projector by only focussing a cross image from the crossed
filaments 173, 174 provided in the electric bulb 172 with the
convex lens 175, which facilitates an efficient centering operation
at such light places as the outdoors. Moreover, it is possible to
make a light projector small-sized, because a number of lenses and
electric bulbs are not required.
Any circuits may be used for a circuit of the light sources of a
light projector. For example, in FIG. 9, alternating current from
an AC power source 181 is rectified to direct current by a
rectifier 182 comprising a bridge circuit to magnetize an
electromagnet 183. A branched circuit 184 branch from a main
circuit 185 is connected to a light projector 113.
Light projectors of the present invention are not limited to boring
machines for metals but may be applied to any boring machines for
wood or for use in offices. Moreover, the present invention is not
limited to boring machines having a drill but may be applied to
tappings or hand presses, etc., in which a setting position of
material to be perforated is indicated instead of focussing at a
position where an extension line of a drill intersects the surface
of a material to be perforated. Therefore, a plurality of light
projectors may be used.
* * * * *