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GB1299911A - Improvements in or relating to dental handpieces - Google Patents

Improvements in or relating to dental handpieces

Info

Publication number
GB1299911A
GB1299911A GB08954/70A GB1895470A GB1299911A GB 1299911 A GB1299911 A GB 1299911A GB 08954/70 A GB08954/70 A GB 08954/70A GB 1895470 A GB1895470 A GB 1895470A GB 1299911 A GB1299911 A GB 1299911A
Authority
GB
United Kingdom
Prior art keywords
gas
gap
rotor
tool
turbine
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.)
Expired
Application number
GB08954/70A
Inventor
Jaroslav Blass
Frantisek Hules
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.)
CKD Praha DIZ AS
CKD Praha Oborovy Podnik
Original Assignee
CKD Praha DIZ AS
CKD Praha Oborovy Podnik
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
Application filed by CKD Praha DIZ AS, CKD Praha Oborovy Podnik filed Critical CKD Praha DIZ AS
Publication of GB1299911A publication Critical patent/GB1299911A/en
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/08—Machine parts specially adapted for dentistry
    • A61C1/18—Flexible shafts; Clutches or the like; Bearings or lubricating arrangements; Drives or transmissions
    • A61C1/181—Bearings or lubricating arrangements, e.g. air-cushion bearings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/02—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools
    • A61C1/05—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools with turbine drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F16C32/0603—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion
    • F16C32/0614—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion the gas being supplied under pressure, e.g. aerostatic bearings
    • F16C32/0622—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion the gas being supplied under pressure, e.g. aerostatic bearings via nozzles, restrictors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2316/00—Apparatus in health or amusement
    • F16C2316/10—Apparatus in health or amusement in medical appliances, e.g. in diagnosis, dentistry, instruments, prostheses, medical imaging appliances
    • F16C2316/13—Dental machines

Landscapes

  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

1299911 Dental handpieces CKD PRAHA OBOROVY PODNIK 21 April 1970 [21 April 1969] 18954/70 Heading A5R [Also in Division F1] A dental handpiece, the torque of which increases with loading, comprises a reaction type gas turbine with a rotor 4 fitted with tangential nozzles 8 and supported in gas lubricated bearings. It is characterised by a circular gap 5 between adjacent surfaces 3 and 14a of the rotor and stator the centre part of said gap communicating with the gas input 2 and the periphery communicating with the gas exhaust 6. Compressed gas enters through the input 2 into the gap 3 and, if the tool is not yet in place in the collet 12, the gas is simply discharged. After the shank of the tool is put into the collet 12 the gas flows through the distribution holes 10, into the ring-shaped cavity 11, through the tangential nozzles 8 out through the exhaust channel 6 and through the gap 5 between bearing surfaces 3 and 14a. When the tool is loaded, the rotor 4 is axially displaced so as to diminish the clearance 5. Due to this the proportion of gas flowing into the ring-shaped cavity 11 is increased and the torque of the turbine is increased. At the same time the pressure within the clearance increases and the bearing capacity of the turbine is enhanced.
GB08954/70A 1969-04-21 1970-04-21 Improvements in or relating to dental handpieces Expired GB1299911A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS284969 1969-04-21

Publications (1)

Publication Number Publication Date
GB1299911A true GB1299911A (en) 1972-12-13

Family

ID=5366781

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08954/70A Expired GB1299911A (en) 1969-04-21 1970-04-21 Improvements in or relating to dental handpieces

Country Status (3)

Country Link
AT (1) AT310932B (en)
DE (1) DE2019189C3 (en)
GB (1) GB1299911A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858323A (en) * 1972-10-27 1975-01-07 Lloyd P Flatland Dental handpiece
DE4141673A1 (en) * 1991-12-17 1993-07-01 Siemens Ag ADJUSTABLE DENTAL TURBINE

Also Published As

Publication number Publication date
DE2019189C3 (en) 1974-05-16
AT310932B (en) 1973-10-25
DE2019189A1 (en) 1970-10-22
DE2019189B2 (en) 1973-10-11

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees