JPS57194359A - Detector for speed of pitched ball - Google Patents

Detector for speed of pitched ball

Info

Publication number
JPS57194359A
JPS57194359A JP8062781A JP8062781A JPS57194359A JP S57194359 A JPS57194359 A JP S57194359A JP 8062781 A JP8062781 A JP 8062781A JP 8062781 A JP8062781 A JP 8062781A JP S57194359 A JPS57194359 A JP S57194359A
Authority
JP
Japan
Prior art keywords
ball
speed
pitched ball
output
force
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.)
Pending
Application number
JP8062781A
Other languages
Japanese (ja)
Inventor
Nobuji Shinoda
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.)
Mizuno Corp
Original Assignee
Mizuno 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 Mizuno Corp filed Critical Mizuno Corp
Priority to JP8062781A priority Critical patent/JPS57194359A/en
Publication of JPS57194359A publication Critical patent/JPS57194359A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/50—Devices characterised by the use of electric or magnetic means for measuring linear speed

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Balance (AREA)

Abstract

PURPOSE:To practice pitching alone with a simple device and also, to confirm the speed of a pitched ball by oneself, by detecting the impact force of the pitched ball for an iron plate supported by >=3 load cells. CONSTITUTION:>=3 load cells 2 are arranged and fitted between an iron plate 1 and 3. A ball is thrown to a ball receiving range 4 of the plate 3 and an output is obtained in accordance with its impact force from the load cell. An impact force F is shown F=alphamV(1+e)/t, where (m) is mass of the ball. A proportional coefficient alpha is constant and a contact time (t) and the force F are measured from the output of the load cell in said formula. The relation between the force F and a repulsion coefficient (e) is stored in an ROM because (e) depends on the speed of a pitched ball. In this way, the speed of a pitched ball V is computed from said parameter and the output of the load cell and its calculated value is displayed.
JP8062781A 1981-05-26 1981-05-26 Detector for speed of pitched ball Pending JPS57194359A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8062781A JPS57194359A (en) 1981-05-26 1981-05-26 Detector for speed of pitched ball

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8062781A JPS57194359A (en) 1981-05-26 1981-05-26 Detector for speed of pitched ball

Publications (1)

Publication Number Publication Date
JPS57194359A true JPS57194359A (en) 1982-11-29

Family

ID=13723585

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8062781A Pending JPS57194359A (en) 1981-05-26 1981-05-26 Detector for speed of pitched ball

Country Status (1)

Country Link
JP (1) JPS57194359A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4928959A (en) * 1988-12-16 1990-05-29 Osteo-Dyne, Inc. Method and device for providing active exercise treatment for a patient suffering from a bone disorder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4928959A (en) * 1988-12-16 1990-05-29 Osteo-Dyne, Inc. Method and device for providing active exercise treatment for a patient suffering from a bone disorder

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