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CA2436132A1 - Air driven low speed dental handpiece motors - Google Patents

Air driven low speed dental handpiece motors Download PDF

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Publication number
CA2436132A1
CA2436132A1 CA002436132A CA2436132A CA2436132A1 CA 2436132 A1 CA2436132 A1 CA 2436132A1 CA 002436132 A CA002436132 A CA 002436132A CA 2436132 A CA2436132 A CA 2436132A CA 2436132 A1 CA2436132 A1 CA 2436132A1
Authority
CA
Canada
Prior art keywords
slot
air
drive shaft
motor
opening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002436132A
Other languages
French (fr)
Other versions
CA2436132C (en
Inventor
Tod H. Brenner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Den Tal Ez Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/724,137 external-priority patent/US5795167A/en
Application filed by Individual filed Critical Individual
Publication of CA2436132A1 publication Critical patent/CA2436132A1/en
Application granted granted Critical
Publication of CA2436132C publication Critical patent/CA2436132C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

Air driven dental handpiece motors include a tubular housing and a rotor rotatably supported within the housing. One motor is geared down by the provision of a plurality of idler gears rotatably supported on a hub which rotates between a sun gear on the output end of the rotor and a ring gear fixed within the housing. A drive shaft connects an exposed drive gear with the hub. A bearing is provided between the drive shaft and the inner bore of skirt extending from the ring gear to reduce a number of tolerances built up between the drive shaft and the bearing.
The motor further includes a valve member rotatable through about 140° of arc to vary maximum motor speed and motor rotation direction. The valve member abuts a valve plate having a circular air inlet opening and a semicircular air outlet or exhaust opening. The valve member has an air supply opening which is an elongated arcuate slot having radiused circumferential ends. Shallow, curvilinear recesses are provided in line with circumferential outer and inner walls of the central slot at each circumferential end of the slot and provide fine, low speed adjustment capability to the valve. Deeper recesses at the center of the slot provide an effective air supply orifice diameter at least as great as the effective orifice diameter of the valve plate inlet air opening to maximize top motor speed.
CA002436132A 1996-09-30 1997-09-09 Air driven low speed dental handpiece motors Expired - Lifetime CA2436132C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/724,137 1996-09-30
US08/724,137 US5795167A (en) 1996-09-30 1996-09-30 Air driven low speed dental handpiece motors
CA002214876A CA2214876C (en) 1996-09-30 1997-09-09 Air driven low speed dental handpiece motors

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002214876A Division CA2214876C (en) 1996-09-30 1997-09-09 Air driven low speed dental handpiece motors

Publications (2)

Publication Number Publication Date
CA2436132A1 true CA2436132A1 (en) 1998-03-30
CA2436132C CA2436132C (en) 2005-07-12

Family

ID=28455366

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002436132A Expired - Lifetime CA2436132C (en) 1996-09-30 1997-09-09 Air driven low speed dental handpiece motors

Country Status (1)

Country Link
CA (1) CA2436132C (en)

Also Published As

Publication number Publication date
CA2436132C (en) 2005-07-12

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EEER Examination request
MKEX Expiry

Effective date: 20170911