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1. US20100187735 - Movable pole extension for a magnetic clamping apparatus and magnetic clamping apparatus having such movable pole extension

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Claims

1. A movable pole extension for a magnetic clamping apparatus ( 1) for holding a ferromagnetic workpiece (P), comprising:
a fixed pole member ( 5) extending in a predetermined longitudinal direction (X-X) and
at least two pole members ( 6, 7) coupled to said fixed pole member ( 5), said at least two pole members ( 6, 7) being movable relative to said fixed pole member ( 5),
holder means ( 8) operably coupled to said fixed pole member ( 5), wherein said holder means ( 8):
are movable in said predetermined longitudinal direction (X-X) between a first operating position (P 1) and a second operating position (P 2) and
operate on said at least two movable pole members ( 6, 7) to hold them in mating contact with said fixed pole member ( 5);
wherein said holder means ( 8) include a hollow member ( 9) in slidably mating relationship with said fixed pole member ( 5), said hollow member ( 9) being able to hold at least one portion ( 5A) of said fixed pole member ( 5) by a form fit between complementary profiles;
wherein said hollow member ( 9) comprises an end wall ( 9A) with side walls ( 9B) extending therefrom in said longitudinal direction (X-X) to contain said at least one portion ( 5A) of said fixed pole member ( 5).
2. The movable pole extension as claimed in claim 1, wherein said at least two movable pole members ( 6, 7) are each movable in different directions relative to said predetermined longitudinal direction (X-X).
3. The movable pole extension as claimed in claim 1, further comprising an abutment means ( 10) for urging said holder means ( 8) to slide in said longitudinal direction (X-X) between said first operating position (P 1) and said second operating position (P 2), thereby limiting the stroke of said holder means ( 8) relative to said fixed pole member ( 5).
4. The movable pole extension as claimed in claim 1, wherein said fixed pole member ( 5) has a receptacle ( 11) that defines at least two curved surfaces ( 12, 13) relative to said predetermined longitudinal direction (X-X) and a bottom ( 14), said at least two movable pole members ( 6, 7) being each in slidably mating contact with one respective surface of said at least two surfaces ( 12, 13).
5. The movable pole extension as claimed in claim 4, wherein said at least two curved surfaces ( 12, 13) are oriented in opposite directions, converging towards said bottom ( 14).
6. The movable pole extension as claimed in claim 1, further comprising elastic means ( 17) operating on said at least two movable pole members ( 6, 7) for holding said at least two movable pole members ( 6, 7) in contact with said fixed pole member ( 5).
7. The movable pole extension as claimed in claim 6 wherein said elastic means ( 17) include at least one spring interposed between said at least two movable pole members ( 6, 7) and said fixed pole member ( 5).
8. The movable pole extension as claimed in claim 1, wherein said fixed pole member ( 5) has fastener means ( 15) for fixation thereof to a clamping plate ( 2) of said magnetic clamping apparatus ( 1).
9. The movable pole extension as claimed in claim 1, wherein said holder means ( 8) and said fixed pole member ( 5) have a circular plan shape.
10. The movable pole extension as claimed in claim 1, wherein said holder means ( 8) and said fixed pole member ( 5) have a polygonal or elliptic plan shape or a polygonal shape with rounded corners.
11. A magnetic clamping apparatus comprising:
a frame adapted to contain a plurality of pole pieces, each of said plurality of pole pieces having a ferromagnetic pole member which defines a clamping surface,
at least one of said plurality of pole pieces is designed to be associated to a movable pole extension ( 4),
said movable pole extension ( 4) comprising:
a fixed pole member ( 5) extending in a predetermined longitudinal direction (X-X) and
at least two pole members ( 6, 7) coupled to said fixed pole member ( 5),
said at least two pole members ( 6, 7) being movable relative to said fixed pole member ( 5),
holder means ( 8) operably coupled to said fixed pole member ( 5), said holder means ( 8) being movable in said predetermined longitudinal direction (X-X) between a first operating position (P 1) and a second operating position (P 2) said holder means operating on said at least two movable pole members ( 6, 7) to hold them in mating contact with said fixed pole member ( 5),
wherein said holder means ( 8) at least partly act as a collector for a magnetic flux generated by said magnetic apparatus ( 1) and said holder means ( 8) include a hollow member ( 9) in slidably mating relationship with said fixed pole member ( 5), said hollow member ( 9) being able to hold at least one portion ( 5A) of said fixed pole member ( 5) by a form fit between complementary profiles.
12. The movable pole extension as claimed in claim 11, wherein said fixed pole member ( 5) has at least two planar surfaces inclined to said predetermined longitudinal direction (X-X), said at least two movable pole members ( 6, 7) being each in slidably mating contact with one respective inclined surface of said fixed pole member.
13. The movable pole extension as claimed in claim 12, where at least two curves surfaces ( 12, 13) define respective sliding surfaces ( 12A, 13A) for said at least two movable pole members ( 6, 7), said respective sliding surfaces ( 12A, 13A) being oriented in opposite directions.
14. The movable pole extension as claimed in claim 13, wherein each of said respective sliding surfaces ( 12A, 13A) forms an angle of 40° to 50°, preferably 45°, relative to said predetermined longitudinal direction (X-X).
15. The movable pole extension as claimed in claimed 12, comprising elastic means ( 17) operating on two movable pole members ( 6, 7) for holding said at least two movable pole members ( 6, 7) in contact with said fixed pole member ( 5).
16. A magnetic clamping apparatus comprising a frame adapted to contain a plurality of pole pieces, each of said plurality of pole pieces having a ferromagnetic pole member which defines a clamping surface, characterized in that at least one of said plurality of pole pieces is designed to be associated to a movable pole extension ( 4), said movable pole extension ( 4) comprising:
a fixed pole member ( 5) extending in a predetermined longitudinal direction (X-X) and
at least two pole members ( 6, 7) coupled to said fixed pole member ( 5), said at least two pole members ( 6, 7) being movable relative to said fixed pole member ( 5),
holder means ( 8) operably coupled to said fixed pole member ( 5), wherein said holder means ( 8):
are movable in said predetermined longitudinal direction (X-X) between a first operating position (P 1) and a second operating position (P 2) and
operate on said at least two movable pole members ( 6, 7) to hold them in mating contact with said fixed pole member ( 5).
17. A movable pole extension for a magnetic clamping apparatus ( 1) for holding a ferromagnetic workpiece (P), comprising:
a fixed pole member ( 5) extending in a predetermined longitudinal direction (X-X) and—at least two pole members ( 6, 7) coupled to said fixed pole member ( 5), said at least two pole members ( 6, 7) being movable relative to said fixed pole member ( 5), holder means ( 8) operably coupled to said fixed pole member ( 5), wherein said holder means ( 8):—are movable in said predetermined longitudinal direction (X-X) between a first operating position (P 1) and a second operating position (P 2) and—operate on said at least two movable pole members ( 6, 7) to hold them in mating contact with said fixed pole member ( 5); wherein said fixed pole member ( 5) has a receptacle ( 11) that defines at least two curved surfaces ( 12, 13) relative to said predetermined longitudinal direction (X-X) and a bottom ( 14), said at least two movable pole members ( 6, 7) being each in slidable mating contact with one respective surface of said at least two surfaces ( 12, 13); wherein said at least two curved surfaces ( 12, 13) are oriented in opposite directions, converging towards said bottom ( 14).
18. A removable pole extension for a magnetic clamping apparatus ( 1) for holding a ferromagnetic workpiece (P), comprising:
a fixed pole member ( 5) extending in a predetermined longitudinal direction (X-X) and
at least two pole members ( 6, 7) coupled to said fixed pole member ( 5),
said at least two pole members ( 6, 7) being movable relative to said fixed pole member ( 5), holder means ( 8) operably coupled to said fixed pole member ( 5),
said holder means ( 8) being movable in said predetermined longitudinal direction (X-X) between a first operating position (P 1) and a second operating position (P 2), said holder means operating on said at least two movable pole members ( 6, 7) to hold them in mating contact with said fixed pole member ( 5),
wherein said holder means ( 8) at least partly act as a collector for a magnetic flux generated by said magnetic apparatus ( 1) and said holder means ( 8) include a hollow member ( 9) in slidably mating relationship with said fixed pole member ( 5), said hollow member ( 9) being able to hold at least one portion ( 5A) of said fixed pole member ( 5) by a form fit between complementary profiles;
wherein said at least two movable pole members ( 6, 7) are each movably in different directions relative to said predetermined longitudinal direction (X-X); and
wherein said hollow member ( 9) comprises an end wall ( 9A) with side walls ( 9B) extending therefrom in said longitudinal direction (X-X) to contain said at least one portion ( 5A) of said fixed pole member ( 5).