Patent US3638362A successfully refreshed from Google Patents.
US3638362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable grinder apparatus
Assignee: Individual
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Filing: 1970-07-23
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Granted: 1972-02-01
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Expires: 1990-07-23
Abstract
Abstract A portable grinding apparatus has a working plate movably mounted on a casing and oscillatable by a motor carried by the casing. The plate includes a top member having downwardly directed flanges and a bottom member adapted to carry on its lower surface on abrasive material and closing the open bottom of the top member. A pipe for connection to a suction device extends through the top member into the interior of the space between the top and bottom members. The bottom member and the grinding material have aligned holes to allow the flow of air and entained chips through the space to the outlet pipe.
Inventors
- 👤 Gottlieb Stoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:39
CPC Classifications
B; B24; B24B; B24B55/00; B24B55/06; B24B55/10; B24B55/105
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
218 words
A portable grinding apparatus comprising, in combination, a casing, a driving motor within said casing having a drive shaft, a working plate movably mounted and supported on said casing so as to be movable within a single plane, s driving connection between said drive shaft of said driving motOr and said working plate, said driving motor causing said working plate to perform an oscillating movement within a plane rectangular to the axis of said drive shaft, a grinding element, said grinding element being mounted on the underside of said working plate turned away from said driving motor, said grinding element being releasably attached to said working plate, a suction device for sucking up the chips produced during grinding operation, means connecting said suction device with at least a portion of the space adjacent the said working plate, wall means cooperating with said working plate and forming therewith a hollow space, through bores in said working plate, said through bores extending from said hollow space to the underside of said working plate turned away from said drive motor, thereby enabling said hollow space to communicate with the outer atmosphere and the space adjacent the underside of said working plate, a suction opening in said wall means, said suction opening serving to connect said hollow space with a suction device.
Claim 2
Dependent Claim
218 words
A portable grinding apparatus comprising, in combination, a casing, a driving motor within said casing having a drive shaft, a working plate movably mounted and supported on said casing so as to be movable within a single plane, s driving connection between said drive shaft of said driving motOr and said working plate, said driving motor causing said working plate to perform an oscillating movement within a plane rectangular to the axis of said drive shaft, a grinding element, said grinding element being mounted on the underside of said working plate turned away from said driving motor, said grinding element being releasably attached to said working plate, a suction device for sucking up the chips produced during grinding operation, means connecting said suction device with at least a portion of the space adjacent the said working plate, wall means cooperating with said working plate and forming therewith a hollow space, through bores in said working plate, said through bores extending from said hollow space to the underside of said working plate turned away from said drive motor, thereby enabling said hollow space to communicate with the outer atmosphere and the space adjacent the underside of said working plate, a suction opening in said wall means, said suction opening serving to connect said hollow space with a suction device.
Claim 3
Dependent Claim
44 words
The portable grinder apparatus set forth in claim 1 in which the said grinding element is a flexible abrasive material and in which the said through bores project downwardly through the bottom surface of the said working plate and through the flexible abrasive material.
Claim 4
Dependent Claim
29 words
The portable grinder apparatus set forth in claim 2, wherein the said suction device forms part of the said grinder apparatus and is driven by the latter''s drive motor.
Claim 5
Dependent Claim
33 words
The portable grinder apparatus set forth in claim 2, wherein the said suction device is a separate, independently driven device, said apparatus including, connected to the said suction opening, a flexible suction line.
Claim 6
Dependent Claim
69 words
The portable grinder apparatus set forth in claim 1, wherein the working plate is substantially rectangular and the through bores extend at right angles in relation to the plane of the abrasive element and are equally spaced along at least two lines arranged symmetrically in relation to the longitudinal middle axis of the said working plate and in parallel relation to the longitudinal edges of the said working plate.
Claim 7
Dependent Claim
68 words
The portable grinder apparatus set forth in claim 1, wherein the suction opening is located within the rear portion of the working plate and on the upper surface opposite the grinding elements and extends through the longitudinal middle plane of the working plate which forms a right angle with the plane of the grinding element, the longitudinal middle plane forming the plane of symmetry of the suction opening.
Claim 8
Dependent Claim
180 words
The portable grinder apparatus set forth in claim 1, wherein the said working plate is divided along a plane extending essentially in parallel to the plane of the grinding element, and wherein said working plate comprises on the one hand an upper portion suspended on the housing of the grinder apparatus, and, on the other hand, a bottom portion which is detachably connected with the upper portion along the plane of division, the upper portion comprising an essentially box-shaped frame which is open towards the plane of division facing the plane of division, with the suction openings extending upwardly through such frame, while the bottom portion comprises a flat plate which rests on the free edges of the frame which face the plane of division and whose rectangular dimensions correspond essentially to the rectangular dimensions of the frame and which is in contact with the edges of the frame, thus closing the cavity existing between the frame and the plate, and which is detachably connected with such edges and which is formed of a material which resists bending and torsion.
Claim 9
Dependent Claim
101 words
The portable grinder apparatus set forth in claim 7, wherein the plate forming the bottom portion comprises, on its surface opposite the cavity, a rigidly mounted plate of resilient material, which carries on its surface opposite the cavity the grinding element which comprises a web of abrasive paper, clamping members mounted on the frame releasably engaging said web, and in that the flat plate as well as the resilient plate and the abrasive paper are provided with aligned passage bores, which connect the cavity existing between the upper portion and the bottom portion with the bottom surface of the abrasive paper.
Claim 10
Dependent Claim
70 words
The portable grinder set forth in claim 8, wherein at least part of the passage bores which extend essentially vertically in relation to the plane formed by the abrasive paper are provided with a shunt opening extending from one side of the bottom portion into the passage bore and serving to direct air drawn off from the zones adjacent the sides of the working plate into the associated passage bore.
References Cited (Backward Citations)
US2499933A
Cited
US3148487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |