Abrading – Machine – Rotary tool
Patent
1996-08-26
1998-09-22
Rose, Robert A.
Abrading
Machine
Rotary tool
451293, 451377, 74 30, B24B 336
Patent
active
058106464
DESCRIPTION:
BRIEF SUMMARY
This invention relates to means for producing relative reciprocatory movement between two members, and is particularly applicable to the movement of the a blade holder from side to side across a grinding wheel in order to sharpen a blade carried by the holder, in use.
In our U.K. Patent Application No. 9300687.2 (2263424A) a grinding tool is disclosed to which a selected one of a number of adapters, each intended to carry a particular implement to be sharpened in use, can be fitted to carry out the sharpening operation. To effect correct sharpening, it is necessary with some of the adapters to move a part thereof manually from side to side across the grinding wheel of the tool, which is driven by an electric motor. Clearly it would be desirable for any such required manual movement to be motorised.
An object of the invention is to provide means for producing relative reciprocatory movement between two members in an effective and convenient manner.
According to the invention means for producing relative reciprocatory movement between two members comprises rotary drive means associated with one of said members, the other of the members being drivable through engagement means for receiving drive from said drive means, one part of the engagement means being such that when it receives said drive it causes the other of said members to move in one direction, another part of the engagement means being such that when it receives said drive it causes the other of said members to move in the opposite direction, the change in the reception of drive from said one part of the engagement means to the other occurring automatically, in use, and the direction of rotation of the drive means being the same when transmitting drive to either said one or said another part of the engagement means.
Preferably the engagement means comprises two parallel, spaced facing racks, the two racks constituting said one part and said another part respectively of the engagement means. More preferably the automatic change in the reception of drive from one rack to the other is effected by resilient means.
Conveniently the resilient means comprises two springs which effect said automatic change when the drive means is at opposite ends of the racks respectively.
Desirably when the drive means is engaged with a rack at a position between the ends thereof, the engagement with the rack is maintained by means of part of said one member travelling in either an upper or lower part of a guide slot associated with the other of the members.
Advantageously the automatic transfer of drive from one rack to the other is effected by the springs effecting relative movement between said part of said one member and said guide slot, at the end of the rack, so that the part can alternately be received in the upper and lower parts of the guide slot, thereby maintaining either the upper rack or the lower rack in engagement with the drive means.
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a perspective view of a grinding tool adapter incorporating the means of the present invention, for driving a blade carrier from side to side across a grinding wheel of a grinding tool to which the adapter is intended to be fitted, in use, the grinding wheel being shown for reference,
FIG. 2 is an exploded perspective view of the various components of the adapter of FIG. 1, with a body of the adapter being shown in place on the grinding wheel of said grinding tool,
FIGS. 3 to 6 respectively diagrammatically show how relative reciprocable movement is accomplished between the blade carrier and the adapter body of FIGS. 1 and 2, and
FIG. 7 is a diagrammatic perspective view of part of the adapter body showing a gear train arrangement for taking drive from the grinding wheel shaft to a drive element to effect said reciprocation.
Although the present invention relates generally to means for producing relative reciprocatory movement between two members, it has a particular application, and will thus be described,
REFERENCES:
patent: 25465 (1859-09-01), Broughton
patent: 1354237 (1920-09-01), Boyd
patent: 1591473 (1926-07-01), De Vivo
patent: 2077689 (1937-04-01), Grobstein
patent: 2821861 (1958-02-01), Dunn
patent: 5191737 (1993-03-01), Snoddy
Rose Robert A.
Turner Intellectual Property Limited
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