Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool
Patent
1996-01-30
1997-12-02
Hirsch, Paul L.
Dentistry
Apparatus
Having motor or means to transmit motion from motor to tool
433115, A61C 102, A61C 1700
Patent
active
056929030
ABSTRACT:
An exchangeable cartridge for a dental handpiece includes first dust-proofing members for preventing foreign matter from being intruded into an upper bearing and second dust-proofing members for preventing foreign matter from being intruded into a lower bearing. The first dust-proofing members have an upper rotational partitioning member and an upper fixed partitioning member. The upper rotational partitioning member has a protrusion provided above the upper bearing and protruding radially outwardly. The upper fixed partitioning member has a radially inwardly protruding portion lying adjacent and parallel to the protrusion of the upper rotational partitioning member to define a first interstice leading to the upper bearing. The second dust-proofing members have a lower rotational partitioning member and a lower fixed partitioning member. The lower rotational partitioning member has a protrusion provided below the lower bearing and protruding radially outwardly. The lower fixed partitioning member has a radially inwardly protruding portion lying adjacent and parallel to the protrusion of the lower rotational partitioning member to define a second interstice leading to the lower bearing.
REFERENCES:
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patent: 1678097 (1928-07-01), Andresen
patent: 3098299 (1963-07-01), Page
patent: 4225308 (1980-09-01), Lohn
patent: 4975056 (1990-12-01), Eibofner
patent: 5252065 (1993-10-01), Nakanishi
patent: 5423678 (1995-06-01), Nakanishi
Hirsch Paul L.
Nakanishi Inc.
Wittenberg Malcolm B.
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