The present invention relates to a method and an arrangement for grinding spherical products (12), such as e.g. bowling balls, in particular. Such an arrangement comprises at least one grinding machine (1) having a spherically oscillating grinding movement. A fastening plate (6) fitted on the grinding machine has a spherically shaped bearing surface (7) and a grinding product (9) fitted on this, which through its slits (13) adopts a position with accuracy of shape on the spherically shaped surface. The grinding product (9) will form a contact surface (17) in the interface, in which the grinding product cooperates with the spherical product. This contact surface then adopts a radius of curvature arranged to substantially correspond to the radius (r) of the spherical product (12). The grinding is performed with a spherically oscillating grinding movement, which is adapted to the radius of the spherical product and simultaneously coincides with the radius of curvature of the contact surface.
B24B 55/10 - Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
B24B 11/06 - Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on workAccessories therefor for grinding balls involving grinding wheels acting by the front faces, e.g. of plane, grooved, or bevelled shape
A63D 5/10 - Apparatus for cleaning balls, pins, or alleys
B24B 23/03 - Portable grinding machines, e.g. hand-guidedAccessories therefor with rotating grinding toolsAccessories therefor the tool being driven in a combined movement
The present invention relates to a support cradle (1) for bowling balls (3). Such a support cradle comprises a support surface (2) adapted to a bowling ball and carried by a frame (4). The support cradle also comprises a bottom cup (7) disposed to join the support surface substantially tightly. The support surface adopts a shape that substantially corresponds to the geometry of the spherical surface (8) of the bowling ball (3). In this connection, the support surface and the bowling ball fitted on this are disposed to form together a substantially tight joint. The support cradle also comprises a connection (9) for compressed fluid for introducing said compressed fluid through the connection in the support cradle, the compressed fluid introduced in the support cradle (1) forming a compressed-fluid cushion between the support surface and the bowling ball. In this manner, the bowling ball is allowed to turn in any direction virtually frictionless.
A63B 47/00 - Devices for handling or treating balls
A63B 47/04 - Devices for handling or treating balls for cleaning balls
B24B 11/10 - Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on workAccessories therefor for grinding balls involving grinding wheels of cup type
3.
ARRANGEMENT AND METHOD FOR GRINDING SPHERICAL PRODUCTS
The present invention relates to a method and an arrangement for grinding spherical products (12), such as e.g. bowling balls, in particular. Such an arrangement comprises at least one grinding machine (1) having a spherically oscillating grinding movement. A fastening plate (6) fitted on the grinding machine has a spherically shaped bearing surface (7) and a grinding product (9) fitted on this, which through its slits (13) adopts a position with accuracy of shape on the spherically shaped surface. The grinding product (9) will form a contact surface (17) in the interface, in which the grinding product cooperates with the spherical product. This contact surface then adopts a radius of curvature arranged to substantially correspond to the radius (r) of the spherical product (12). The grinding is performed with a spherically oscillating grinding movement, which is adapted to the radius of the spherical product and simultaneously coincides with the radius of curvature of the contact surface.
B24B 11/06 - Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on workAccessories therefor for grinding balls involving grinding wheels acting by the front faces, e.g. of plane, grooved, or bevelled shape
B24B 23/03 - Portable grinding machines, e.g. hand-guidedAccessories therefor with rotating grinding toolsAccessories therefor the tool being driven in a combined movement
B24B 55/10 - Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
B24D 11/00 - Constructional features of flexible abrasive materialsSpecial features in the manufacture of such materials
A handheld machine, comprising a first grip (106) for receiving a first hand of a user of the machine, a second grip (118) for receiving a second hand of the user of the machine, and at least one coupling (114) for connecting the handheld machine to a flexible line (116). The second grip (118) extends in its usage position over the coupling (114) but is displaceable from this position.
B24B 55/00 - Safety devices for grinding or polishing machinesAccessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
B24B 23/02 - Portable grinding machines, e.g. hand-guidedAccessories therefor with rotating grinding toolsAccessories therefor
B23Q 11/00 - Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling workSafety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
B24B 23/00 - Portable grinding machines, e.g. hand-guidedAccessories therefor
B25F 5/02 - Construction of casings, bodies or handles
The present invention relates particularly to an oscillating grinding machine. The grinding machine comprises a driving motor (3) surrounded by a body (3), and a drive shaft (4) cooperating with the driving motor. The drive shaft comprises a grinding head (5) that constitutes a support for a grinding product (8). The drive shaft (4) is arranged in two pieces and comprises a main shaft (11) and an eccentric shaft (10) arranged rigidly thereto. The eccentric shaft comprises a center line (12) that assumes an angle (α) against a corresponding center line (13) of the main shaft, and thus the grinding head (5) will assume an eccentric placement in relation to the main shaft (11). Thus, the grinding head is arranged to oscillate in a substantially spherical plane provided by the rotation of the main shaft and the eccentricity and inclination of the eccentric shaft in relation to the main shaft.
B24B 49/00 - Measuring or gauging equipment for controlling the feed movement of the grinding tool or workArrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
The present invention particularly relates to a hand-held sanding machine with an outer housing (1), a tool shaft (2) and a brushless electric drive motor. In the present invention, the rotor of the drive motor is fastened to the tool shaft (2) of the sanding machine, and the stator (6) is positioned in the outer housing (1). The present invention also relates to a control method for an electric sanding machine.
B24B 23/02 - Portable grinding machines, e.g. hand-guidedAccessories therefor with rotating grinding toolsAccessories therefor
B24B 23/04 - Portable grinding machines, e.g. hand-guidedAccessories therefor with oscillating grinding toolsAccessories therefor
H02P 6/00 - Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor positionElectronic commutators therefor
The present invention relates particularly to an oscillating grinding machine. The grinding machine comprises a driving motor (3) surrounded by a body (3), and a drive shaft (4) cooperating with the driving motor. The drive shaft comprises a grinding head (5) that constitutes a support for a grinding product (8). The drive shaft (4) is arranged in two pieces and comprises a main shaft (11) and an eccentric shaft (10) arranged rigidly thereto. The eccentric shaft comprises a centre line (12) that assumes an angle (α) against a corresponding centre line (13) of the main shaft, and thus the grinding head (5) will assume an eccentric placement in relation to the main shaft (11). Thus, the grinding head is arranged to oscillate in a substantially spherical plane provided by the rotation of the main shaft and the eccentricity and inclination of the eccentric shaft in relation to the main shaft.
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