Patent US3728027A successfully refreshed from Google Patents.
US3728027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable magnetic boring machine having light beam centering device
Assignee: Nitto Giken KK
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Filing: 1971-01-11
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Granted: 1973-04-17
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Expires: 1991-01-11
Abstract
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
- 👤 T Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:51
CPC Classifications
B; B23; B23B; B23B49/00; B23Q; B23Q17/00; B23Q17/24; Y; Y10; Y10T; Y10T408/00; Y10T408/21; Y10T408/55; Y10T408/554
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
259 words
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) .
Claim 2
Dependent Claim
259 words
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) .
Claim 3
Dependent Claim
18 words
Apparatus as claimed in claim 1, including means for releasably securing the light projector to said main body.
Claim 4
Dependent Claim
27 words
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.
Claim 5
Dependent Claim
13 words
Apparatus according to claim 1 wherein said boring machine is a drilling machine.
Claim 6
Dependent Claim
22 words
Apparatus according to claim 1 wherein said main body is slideably movable relative to said magnetic base to locate the boring point.
Claim 7
Dependent Claim
22 words
Apparatus according to claim 1 wherein said magnetic base is slideably movable relative to said magnetic surface to locate the boring point.
Claim 8
Dependent Claim
23 words
Apparatus according to claim 6 wherein said main body is further slideably movable relative to said magnetic base to locate said boring point.
Claim 9
Dependent Claim
43 words
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.
Claim 10
Dependent Claim
25 words
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.
Claim 11
Dependent Claim
31 words
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.
Claim 12
Dependent Claim
69 words
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.
Claim 13
Dependent Claim
16 words
Apparatus according to claim 11 wherein said housing includes a partition between said two electric bulbs.
Claim 14
Dependent Claim
16 words
Apparatus according to claim 1 wherein said light emitting filaments are substantially arranged at right angles.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |