Medical or dental treatment instrument
AssigneeKaltenbach & Voigt GmbH & Co.
InventorsBernhard Lingenhole, Eugen Mohr
Life of this patent
Estimating the term…
Abstract
In a medical or dental treatment instrument, in particular a straight or angled handpiece (1), having a drive shaft (6) for a tool, which drive shaft is mounted in the forward end region of the treatment instrument, in at least one roller bearing (11, 12), rotatable around its middle axis (8), and is drivable for example by a turbine, whereby the roller bearing (11, 12) is blocked or sealed against contaminants with of a blocking ring (31) effective between its outer ring (37) and its inner ring (34). The blocking ring (31) bears with its surface facing the inner ring (34) on the inner ring (34) and is releasibly or non-releasibly attached thereon.
Claims22
A medical or dental treatment instrument comprising a handpiece (1) and a drive shaft (6) for a tool, said drive shaft (6) being mounted in a forward housing (7) of the instrument and being drivable by drive means, at least one roller bearing (11, 12) rotatable about a middle axis and disposed around said shaft (6), wherein said drive shaft (6) penetrates an associated wall (7a) of the housing (7) in a hole (7c, 27) and wherein said roller bearing (11, 12) is blocked against contaminants by means of a first blocking ring (31) effective between an outer ring (37) associated with the housing (7) and an inner ring (34) able to rotate with said drive shaft (6), wherein said first blocking ring (31) is formed by an annular disk and has an inner radial surface facing and in contact with said inner ring (34), the inner ring (34) having an outer radial surface and the outer ring (37) having an inner radial surface, and wherein:
- the first blocking ring (31) is non-releasably attached on the outer radial surface of the inner ring (34);
- the outer ring (37) has a radial inner shoulder (42) projecting therefrom and having an inner end portion opposite the inner surface of outer ring (37);
- and the end portion of the shoulder (42) overlaps an outer end portion of the first blocking ring (31).
A medical or dental treatment instrument comprising a handpiece (1) and a drive shaft (6) for a tool, said drive shaft (6) being mounted in a forward housing (7) of the instrument and being drivable by drive means, at least one roller bearing (11, 12) rotatable about a middle axis and disposed around said shaft (6), wherein said roller bearing (11, 12) penetrates an associated wall (7a) of the housing (7) in a hole (7c, 27) and wherein said roller bearing (11, 12) is blocked against contaminants by means of a first blocking ring (31) effective between an outer ring (37) associated with the housing (7) and an inner ring (34) able to rotate with said drive shaft (6), wherein said first blocking ring (31) is formed by an annular disk and has an inner radial surface facing and in contact with said inner ring (34), the inner ring (34) having an outer radial surface and the outer ring (37) having an inner radial surface, and wherein:
- the blocking ring (31a) is disposed on a sleeve (31b) comprising a radial disk, said disk (31b) bearing against a side of the inner ring (34) and being associated with the drive shaft (6) fixed for rotation therewith;
- the outer ring (37) has a radial inner shoulder (42) projecting inwardly;
- and an inner end portion of the shoulder (42) overlaps an outer end portion of the blocking ring (31a).
A roller bearing assembly (11, 12) for a treatment instrument, comprising:
- an outer ring (37) able to be associated with a housing (7), said outer ring having a radially inner surface;
- an inner ring (34) able to rotate with said drive shaft (6), the inner ring (34) having a radially outer surface facing said inner surface of said outer ring (37);
- a ball groove bearing (47) disposed between said outer ring (37) and said inner ring (34) and disposable around a rotatable drive shaft (6);
- a blocking ring (31) effective between said outer ring (37) and said inner ring (34), said blocking ring (31) comprising an annular disk having a radially inner surface facing and in contact with said inner ring (34), wherein:
- the blocking ring (31) is non-releasably attached on the outer surface of the inner ring (34);
- the outer ring (37) has a radial inner shoulder (42) projecting therefrom and having an inner end portion opposite the inner surface of outer ring (37);
- and the end portion of the shoulder (42) overlaps an outer end portion of the blocking ring (31).
Dependencies are inferred from the claim text.