US20040159150A1 - Dual-string dynamometer for measuring dental handpiece power at high speed and low torque - Google Patents

Dual-string dynamometer for measuring dental handpiece power at high speed and low torque Download PDF

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Publication number
US20040159150A1
US20040159150A1 US10/689,297 US68929703A US2004159150A1 US 20040159150 A1 US20040159150 A1 US 20040159150A1 US 68929703 A US68929703 A US 68929703A US 2004159150 A1 US2004159150 A1 US 2004159150A1
Authority
US
United States
Prior art keywords
string
dynamometer
dual
test wheel
high speed
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.)
Abandoned
Application number
US10/689,297
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English (en)
Inventor
Eugene Novak
Tom Papanek
Tadeusz Parafinczuk
Todd Fanciullo
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.)
Dentsply Research and Development Corp
Original Assignee
Dentsply Research and Development Corp
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 Dentsply Research and Development Corp filed Critical Dentsply Research and Development Corp
Priority to US10/689,297 priority Critical patent/US20040159150A1/en
Assigned to DENTSPLY RESEARCH & DEVELOPMENT CORP. reassignment DENTSPLY RESEARCH & DEVELOPMENT CORP. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FANCIULLO, TODD, PARAFINCZUK, TADEUSZ, NOVAK, EUGENE J., PAPANEK, TOM
Publication of US20040159150A1 publication Critical patent/US20040159150A1/en
Priority to US11/022,092 priority patent/US20050103102A1/en
Priority to US11/395,926 priority patent/US20070017283A1/en
Priority to US12/750,778 priority patent/US7997131B2/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/045—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft by measuring variations of frequency of stressed vibrating elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/24—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity
    • G01L3/242—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity by measuring and simultaneously multiplying torque and velocity
    • 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
    • A61C1/185—Drives or transmissions
    • A61C1/186—Drives or transmissions with torque adjusting or limiting means

Definitions

  • the present invention is generally related to string tension dynamometers used to measure power in a high speed, low torque dental handpiece. More particularly, the invention relates to such a dynamometer employing dual or two strings in order to avoid a lateral force being exerted on the test wheel. The lateral forces are balanced resulting in a total lateral force net value of zero.
  • the power output of high-speed, low torque dental handpieces can be measured using a string tension dynamometer.
  • a string tension dynamometer which is a device that applies a load to a handpiece through a string looped around a pulley mounted in a handpiece chuck (See FIG. 1).
  • String tension is measured by the deflection of weighted dials to which the ends of the string are attached. Under steady-state conditions, the net tension on the string multiplied by the pulley radius is equal to the handpiece torque.
  • the face of the pulley is half blacked out for speed detection using an optical tachometer.
  • the pulley shaft conforms to DIN 13950 and ISO 1797 (0.0628′′, 1.595 millimeters diameter).
  • the pulley wheel is lightweight aluminum, unconcentricity not more the 0.0003 inches.
  • Each pulley is tested for balance at speeds up to 500,000 RPM by recording the free spin RPM of a new handpiece with each pulley and discarded if they are statistical outliers.
  • the maximum power output of a handpiece occurs at a speed that is about half the no-load (or free-running) speed. To determine the power output, the maximum speed and the torque at half the maximum speed is measured. Torque and power can be measured as follows:
  • P is the power in Watts.
  • v is the speed expressed as angular velocity, radians per second.
  • RPM is the speed in revolutions per minute at which the torque was measured.
  • ⁇ is the constant 3.14159.
  • TR and TL are the right and left dial deflection readings (See FIG. 1).
  • m is the mass of the dial weights expressed in kilograms.
  • g is the gravitational acceleration, about 9.8 meters per second 2 .
  • R is the pulley radius in meters (such as for example, 0.100′′ or 2.54 ⁇ 10 ⁇ 3 meters).
  • the actual pulley radius is adjusted to compensate for the thickness of the string.
  • the effective pulley radius including the radius of the string is 0.100′′.
  • a dual-string tension dynamometer according to the present invention utilizes two strings.
  • the lateral forces are balanced such that the total lateral force net value is zero.
  • the results reflect purely torsional loading.
  • FIG. 1 is a schematic representation of a Prior Art single string tension dynamometer, showing the left and right dial deflection readings as T L and T R respectively.
  • the force vector representing tension at T S is equal to the sum of T L and T R .
  • a single-string dynamometer works on the premise that the tension difference between two sides of a load string equals the force applied to a test wheel at that specific radius. By summing vectors a resultant vector is found. This resultant cannot be zero due to the nature of the dynamometers operation. Additionally, this vector may include an orthogonal component if the load string is not mounted tangent to the test wheel. According to the present invention, adding a second string introduces a second set of forces. By keeping appropriate tension magnitudes equal, a zero net force results. A state of purely torsional loading has been reached.
  • a dual-string dynamometer 1 includes two filaments 10 and 11 , wrapped around approximately ninety degrees of a test wheel 12 .
  • a conventional control device (not shown) may be introduced to maintain equal tensions and a zero lateral load.
  • Power values are determined by multiplying torque values with angular speed data. Such relationships are expressed according to the following equations, where A, B, C, D, E and F are force vectors at indicated points of the filaments 10 and 11 as shown on FIG. 2.
  • A is the tension on one end of string 10 ;
  • B is the tension on a same side of string 11 ;
  • C is the tension on the other side of string 10 from A;
  • D is the tension on the other side of string 11 from B; as is shown representationally in FIG. 2.
  • a dual-string dynamometer 1 as described eliminates lateral loading, which provides loading condition certainty. High speed, low torque power data can be accurately attained in an otherwise conventional manner.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
US10/689,297 2002-10-18 2003-10-20 Dual-string dynamometer for measuring dental handpiece power at high speed and low torque Abandoned US20040159150A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US10/689,297 US20040159150A1 (en) 2002-10-18 2003-10-20 Dual-string dynamometer for measuring dental handpiece power at high speed and low torque
US11/022,092 US20050103102A1 (en) 2002-10-18 2004-12-22 Dual-string dynamometer for measuring dental handpiece power at high speed and low torque
US11/395,926 US20070017283A1 (en) 2002-10-18 2006-03-30 Dual-string dynamometer for measuring dental handpiece power at high and low speed
US12/750,778 US7997131B2 (en) 2002-10-18 2010-03-31 Dual-string dynamometer for measuring dental handpiece power at high speed and low torque

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US41937402P 2002-10-18 2002-10-18
US10/689,297 US20040159150A1 (en) 2002-10-18 2003-10-20 Dual-string dynamometer for measuring dental handpiece power at high speed and low torque

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/022,092 Continuation US20050103102A1 (en) 2002-10-18 2004-12-22 Dual-string dynamometer for measuring dental handpiece power at high speed and low torque

Publications (1)

Publication Number Publication Date
US20040159150A1 true US20040159150A1 (en) 2004-08-19

Family

ID=32108068

Family Applications (3)

Application Number Title Priority Date Filing Date
US10/689,297 Abandoned US20040159150A1 (en) 2002-10-18 2003-10-20 Dual-string dynamometer for measuring dental handpiece power at high speed and low torque
US11/022,092 Abandoned US20050103102A1 (en) 2002-10-18 2004-12-22 Dual-string dynamometer for measuring dental handpiece power at high speed and low torque
US12/750,778 Expired - Fee Related US7997131B2 (en) 2002-10-18 2010-03-31 Dual-string dynamometer for measuring dental handpiece power at high speed and low torque

Family Applications After (2)

Application Number Title Priority Date Filing Date
US11/022,092 Abandoned US20050103102A1 (en) 2002-10-18 2004-12-22 Dual-string dynamometer for measuring dental handpiece power at high speed and low torque
US12/750,778 Expired - Fee Related US7997131B2 (en) 2002-10-18 2010-03-31 Dual-string dynamometer for measuring dental handpiece power at high speed and low torque

Country Status (7)

Country Link
US (3) US20040159150A1 (fr)
EP (1) EP1552261B1 (fr)
JP (1) JP2006503298A (fr)
AT (1) ATE338270T1 (fr)
CA (1) CA2502472C (fr)
DE (1) DE60308049T2 (fr)
WO (1) WO2004036167A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105675190A (zh) * 2016-02-02 2016-06-15 上海摩虹轴承有限公司 高速涡轮牙科手机功率测试装置及测试方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1552261B1 (fr) 2002-10-18 2006-08-30 Dentsply International, Inc. Dynamometre a double corde pour la mesure de puissance de piece a main dentaire a grande vitesse et faible couple
US20070017283A1 (en) * 2002-10-18 2007-01-25 Novak Eugene J Dual-string dynamometer for measuring dental handpiece power at high and low speed
US9250160B2 (en) 2013-03-15 2016-02-02 American Dental Association Method and apparatus for characterizing handpieces

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US1730974A (en) * 1928-12-11 1929-10-08 Atlantic Elevator Company Inc Elevator suspension
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US3192768A (en) * 1961-12-05 1965-07-06 Exxon Production Research Co Line tensiometer
US3210992A (en) * 1961-08-25 1965-10-12 Ampex Ultrasensitive force and speed measuring device
US3354711A (en) * 1967-02-09 1967-11-28 Du Pont Continuous thread tension indicating drive roller
US3598999A (en) * 1969-02-17 1971-08-10 Bendix Corp Proportional trim control system for aircraft
US3717205A (en) * 1971-01-27 1973-02-20 Kenting Drilling Ltd Draw works for drilling rig
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US4856325A (en) * 1987-08-31 1989-08-15 Kanzaki Paper Manufacturing Co., Ltd. Apparatus for measuring adhesion
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US5335527A (en) * 1992-11-20 1994-08-09 Hitachi Cable, Ltd. Method and apparatus for manufacturing a composite metal wire by using a two wheel type continuous extrusion apparatus
US5667465A (en) * 1995-02-07 1997-09-16 Trotter, Inc. Multidirectional cam
US5945602A (en) * 1996-12-18 1999-08-31 Ncr Corporation Apparatus for monitoring a self-service transaction terminal
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1435082A (en) * 1922-03-14 1922-11-07 Daniel V Reedy Freight and passenger elevator
US1605079A (en) * 1925-05-04 1926-11-02 Wellman Seavermorgan Co Car-dumping cradle
US1730974A (en) * 1928-12-11 1929-10-08 Atlantic Elevator Company Inc Elevator suspension
US3023615A (en) * 1960-06-10 1962-03-06 Sun Oil Co Dynamometer
US3210992A (en) * 1961-08-25 1965-10-12 Ampex Ultrasensitive force and speed measuring device
US3192768A (en) * 1961-12-05 1965-07-06 Exxon Production Research Co Line tensiometer
US3354711A (en) * 1967-02-09 1967-11-28 Du Pont Continuous thread tension indicating drive roller
US3598999A (en) * 1969-02-17 1971-08-10 Bendix Corp Proportional trim control system for aircraft
US3717205A (en) * 1971-01-27 1973-02-20 Kenting Drilling Ltd Draw works for drilling rig
US3829052A (en) * 1972-05-01 1974-08-13 Kaman Aerospace Corp Vibration isolator
US4137974A (en) * 1977-01-06 1979-02-06 Smith International, Inc. Hydraulically driven kelly crowd
US4939939A (en) * 1987-03-18 1990-07-10 Peter Lancier Maschinenbau-Hafenhuette Gmbh & Co.,Kg Apparatus for measuring a traction force by means of a traction dynamometer
US4960001A (en) * 1987-03-18 1990-10-02 Peter Lancier Maschinebau-Hafenhutte Gmbh & Co. KG Traction dynamometer for measuring tensile forces in the laying of cables
US4856325A (en) * 1987-08-31 1989-08-15 Kanzaki Paper Manufacturing Co., Ltd. Apparatus for measuring adhesion
US5282580A (en) * 1991-09-20 1994-02-01 Bryan Kent Method and apparatus for winding ring-shaped articles
US5335527A (en) * 1992-11-20 1994-08-09 Hitachi Cable, Ltd. Method and apparatus for manufacturing a composite metal wire by using a two wheel type continuous extrusion apparatus
US5667465A (en) * 1995-02-07 1997-09-16 Trotter, Inc. Multidirectional cam
US5945602A (en) * 1996-12-18 1999-08-31 Ncr Corporation Apparatus for monitoring a self-service transaction terminal
US6311805B1 (en) * 2000-02-16 2001-11-06 Chih-Chen Juan Balanced braking system for a bicycle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105675190A (zh) * 2016-02-02 2016-06-15 上海摩虹轴承有限公司 高速涡轮牙科手机功率测试装置及测试方法

Also Published As

Publication number Publication date
US20100326181A1 (en) 2010-12-30
US7997131B2 (en) 2011-08-16
ATE338270T1 (de) 2006-09-15
CA2502472A1 (fr) 2004-04-29
EP1552261B1 (fr) 2006-08-30
JP2006503298A (ja) 2006-01-26
DE60308049D1 (de) 2006-10-12
CA2502472C (fr) 2011-05-17
US20050103102A1 (en) 2005-05-19
WO2004036167A3 (fr) 2004-07-08
WO2004036167A2 (fr) 2004-04-29
DE60308049T2 (de) 2006-12-14
EP1552261A2 (fr) 2005-07-13

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Owner name: DENTSPLY RESEARCH & DEVELOPMENT CORP., CALIFORNIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NOVAK, EUGENE J.;PAPANEK, TOM;PARAFINCZUK, TADEUSZ;AND OTHERS;REEL/FRAME:015285/0869;SIGNING DATES FROM 20040319 TO 20040415

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION