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US 4,710,070 AGranted
Device in back spot facing tools
AssigneeErix Tool AB
InventorsPer Alsen, Timo Salo
Life of this patent
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AssigneeErix Tool AB
InventorsPer Alsen, Timo Salo
Estimating the term…
A device in back spot facing tools of the kind comprising a spindle (11), at one front end portion (12) of which, at least one wing (14) is arranged in a recess (13) and pivotally mounted parallel with and eccentrically with respect to the spindle about an axle (15, 16). The wing is at the rotation of the spindle arranged to pivot from an inactive position within the circumference of the spindle to an active position outside it. It is at the part of the wing located outside of the spindle provided with at least one cutting edge and/or a cutter (17). The pivoted part of the wing (14) outside the spindle (12) is at least at its one preferably its front end surface (21) designed with an inclined ramp (22), which in the extended position of the wing, has its maximum height, as seen in the axial direction of the wing, in a portion located closest to the circumference of the spindle (12) and is arranged to incline towards the external, curved envelope surface (23 ) of the wing. The transition section (29) of the ramp (22) in the envelope surface (23) of the wing is slightly chamfered, so that at the insertion of the spindle in a boring (20) of a workpiece (19), the portion of the wing (14) which during the rotation is pivoted outwards is in contact with the hole edge (27) of the boring and is pivoted to the inactive position at the continued displacement in the boring.
A back spot facing tool of the type comprising a spindle and at least one wing having a curved external envelope surface and arranged in a recess at one front end portion of said spindle, said wing being pivotally mounted about an axis parallel witht he spindle and eccentric to the spindle axis, said wing being arranged upon rotation of the spindle to pivot from an inactive position inside the circumference of the spindle to an active position outside the spindle, the part of the wing projecting outside the spindle being provided with at least one cutting edge, characterized in that, when the wing is in its full active position, the part of the wing which is outside the spindle has an end surface provided with an inclined ramp having the maximum height as seen in the axial direction of the spindle at a portion located closest to the circumference of the spindle and that a transitional portion between the ramp and the envelope surface of the wing is slightly chamfered, in order to ensure that the portion of the wing, which during rotation projects from the spindle, at insertion of the tool in a bore in a work piece, engages the bore edge and is pivoted to inactive position upon continued displacement in the bore.
A back spot facing tool comprising:
Dependencies are inferred from the claim text.