GB1234903A - Improvements in speed control means - Google Patents
Improvements in speed control meansInfo
- 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
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)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
- Control Of Non-Electrical Variables (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.
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)
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 |
-
1968
- 1968-08-27 SE SE11529/68A patent/SE319574B/xx unknown
-
1969
- 1969-08-14 FR FR6928013A patent/FR2017040A1/fr not_active Withdrawn
- 1969-08-18 AT AT789469A patent/AT301743B/en not_active IP Right Cessation
- 1969-08-18 US US850867A patent/US3567330A/en not_active Expired - Lifetime
- 1969-08-20 CH CH1261569A patent/CH494426A/en not_active IP Right Cessation
- 1969-08-20 GB GB41453/69A patent/GB1234903A/en not_active Expired
- 1969-08-26 NL NL6913005A patent/NL6913005A/xx not_active Application Discontinuation
- 1969-08-26 BE BE737974D patent/BE737974A/xx unknown
Also Published As
Publication number | Publication date |
---|---|
BE737974A (en) | 1970-02-02 |
AT301743B (en) | 1972-09-11 |
SE319574B (en) | 1970-01-19 |
US3567330A (en) | 1971-03-02 |
NL6913005A (en) | 1970-03-03 |
FR2017040A1 (en) | 1970-05-15 |
CH494426A (en) | 1970-07-31 |
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