GB1234903A - Improvements in speed control means - Google Patents

Improvements in speed control means

Info

Publication number
GB1234903A
GB1234903A GB41453/69A GB4145369A GB1234903A GB 1234903 A GB1234903 A GB 1234903A GB 41453/69 A GB41453/69 A GB 41453/69A GB 4145369 A GB4145369 A GB 4145369A GB 1234903 A GB1234903 A GB 1234903A
Authority
GB
United Kingdom
Prior art keywords
coil
signal
aug
pressure
control valve
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
GB41453/69A
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.)
Atlas Copco AB
Original Assignee
Atlas Copco AB
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 Atlas Copco AB filed Critical Atlas Copco AB
Publication of GB1234903A publication Critical patent/GB1234903A/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
    • A61C1/02—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
    • 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
    • A61C1/0007—Control devices or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/06—Adaptations for driving, or combinations with, hand-held tools or the like control thereof
    • F01D15/062—Controlling means specially adapted therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y10S415/904—Tool drive turbine, e.g. dental drill

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Veterinary Medicine (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Control Of Non-Electrical Variables (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Abstract

1,234,903. Valves. ATLAS COPCO A.B. 20 Aug., 1969 [27 Aug., 1968], No. 41453/69. Heading F2V. [Also in Division G3] The speed of a fluid powered, hand held, grinding or drilling machine, e.g. for dentistry is kept constant by controlling the fluid pressure by a valve responsive to the difference between an actual speed signal and an adjustable reference signal. The control valve is preceded by a pressure reduction valve (Fig. 3, not shown). The actual speed signal is a D.C. voltage derived from an A.C. signal produced in a pick-up coil associated with magnetic inserts in the rotor of the machine and it is compared with the reference signal from a potentiometer in an integrating operational amplifier whose output is connected through a servo amplifier to the control valve. As shown, this comprises a coil 43 whose energization progressively causes an armature 45 to uncover a bleed orifice 41, against the pressure of a piston 46 connected to the inlet 38, but in an alternative arrangement (Fig. 7, not shown) the coil is disposed in an annular magnetic field and is mounted on a member which is movable axially to throttle the fluid supply.
GB41453/69A 1968-08-27 1969-08-20 Improvements in speed control means Expired GB1234903A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE11529/68A SE319574B (en) 1968-08-27 1968-08-27

Publications (1)

Publication Number Publication Date
GB1234903A true GB1234903A (en) 1971-06-09

Family

ID=20294131

Family Applications (1)

Application Number Title Priority Date Filing Date
GB41453/69A Expired GB1234903A (en) 1968-08-27 1969-08-20 Improvements in speed control means

Country Status (8)

Country Link
US (1) US3567330A (en)
AT (1) AT301743B (en)
BE (1) BE737974A (en)
CH (1) CH494426A (en)
FR (1) FR2017040A1 (en)
GB (1) GB1234903A (en)
NL (1) NL6913005A (en)
SE (1) SE319574B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3959883A (en) * 1973-07-23 1976-06-01 Walls Earl L Hand control system for power hand tools
US3955283A (en) * 1974-10-31 1976-05-11 Timothy William Mehallick Flexible handpiece mounted control for dental drills
US4256998A (en) * 1976-12-17 1981-03-17 Samuels Basil J Electrical control arrangement
DE19529668A1 (en) * 1995-08-11 1997-02-13 Kaltenbach & Voigt Medical or dental turbine handpiece
US6146137A (en) * 1998-11-19 2000-11-14 Vogel; William Charles Contamination prevention device for ultra high speed dental type handpieces
US6655033B2 (en) * 2001-10-16 2003-12-02 Bettcher Indusrties, Inc. Pneumatic hand tool with improved control valve

Also Published As

Publication number Publication date
AT301743B (en) 1972-09-11
US3567330A (en) 1971-03-02
CH494426A (en) 1970-07-31
BE737974A (en) 1970-02-02
SE319574B (en) 1970-01-19
NL6913005A (en) 1970-03-03
FR2017040A1 (en) 1970-05-15

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