US3673741A - Apparatus for preventing circumferential overspeeding of grinding wheel - Google Patents

Apparatus for preventing circumferential overspeeding of grinding wheel Download PDF

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Publication number
US3673741A
US3673741A US70040A US3673741DA US3673741A US 3673741 A US3673741 A US 3673741A US 70040 A US70040 A US 70040A US 3673741D A US3673741D A US 3673741DA US 3673741 A US3673741 A US 3673741A
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Prior art keywords
grinding wheel
diameter
pulley
spindle
speed
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US70040A
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English (en)
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Tsuyoshi Koide
Ikuo Othu
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
    • B24B47/18—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces for rotating the spindle at a speed adaptable to wear of the grinding wheel

Definitions

  • ABSTRACT An apparatus for preventing circumferential overspeeding of a grinding wheel in a grinding machine wherein the rotating speed of the grinding wheel spindle is made variable through pulley exchange comprises a grinding wheel head with the grinding wheel spindle rotatably mounted thereto and a motor connected to drive the spindle.
  • a large-diameter grinding wheel rejecting pin obstructs the space to be occupied by a large-diameter grinding wheel when a small-diameter high-speed pulley is connected to drive the grinding wheel spindle. This prevents the mounting of a largediameter grinding wheel.
  • a high-speed pulley rejecting pin is mechanically interlocked with the large-diameter grinding wheel rejecting pin and each moves in the same direction. The high-speed pulley rejecting pin obstructs the space to be occupied by the high-speed pulley when a large-diameter grinding wheel is connected to the spindle thereby preventing the mounting of the high-speed pulley.
  • the present invention relates to a novel device for simply and reliably preventing circumferential overspeeding of a grinding wheel thereby avoiding the hazard of the grinding wheel being broken with a resultant drop in work efficiency.
  • the grinding wheel In the conventional grinding of a work piece on the periphery of a grinding wheel, the grinding wheel is usually driven by the motor pulley and the grinding wheel spindle pulley linked by V-belts for transmission of the motion from the motor.
  • the rotary speed of the grinding wheel spindle is constant when the diameter combination of the two pulleys is given.
  • the circumferential speed of the grinding wheel drops and in consequence the grinding efficiency falls.
  • the object of this invention is to provide a mechanism for making it impossible to mount a large-diameter grinding wheel on the grinding wheel spindle while a small-diameter pulley of the grinding wheel spindle matching a reduced-diameter grinding wheel is left on, thereby averting the destruction of the grinding wheel due to overspeeding.
  • Another object of the invention is to make this mechanism simple and low-priced.
  • the grinding wheel spindle is rotatably mounted on the grinding wheel head.
  • the motor rotation is transmitted to the grinding wheel spindle via pulleys and V-belts.
  • the rotating speed of the grinding wheel spindle can be varied by a change in the pulley combination. ln continued grinding with a large-diameter grinding wheel and a low-speed pulley the circumference of the grinding wheel wears away with the result that the diameter diminishes, the circumferential speed drops and the work efiiciency falls. A high-speed pulley is then substituted for the low-speed pulley to drive the grinding wheel at a higher rotary speed.
  • the grinding wheel with its diameter reduced to a certain limit must be replaced with a large-diameter one. If this replacement is done with the pulley unchanged, the circumferential speed of the new grinding wheel will become excessive and may break the grinding wheel.
  • the high-speed pulley is on the grinding wheel spindle, the mounting of a large-diameter grinding wheel is obstructed by a large-diameter grinding wheel rejecting pin. Also, when the large-diameter grinding wheel is on, the mounting of a high-speed pulley is prevented by a high-speed pulley rejecting pin.
  • FIG. 1 is a side elevational view of an embodiment of the present invention
  • FIG. 2 is a top plan view of the embodiment shown in FIG. I.
  • FIG. 3 is an enlarged fragmental sectional view of the embodiment of FIGS. 1 and 2 illustrating the details of the present invention.
  • a grinding wheel 3 is fixed to one end of a grinding wheel spindle 2 rotatably mounted on a grinding wheel head 1.
  • a pulley 4-or 33 is fixed to the other end of the spindle 2.
  • a new large-diameter grinding wheel, indicated by reference character a, is mounted on the grinding wheel spindle 2.
  • a pulley exchange is required for rotating the grinding wheel until it reaches the diameter indicated by reference character c.
  • the low-speed pulley 4 matching the large-diameter grinding wheel is replaced by the high-speed pulley 33 for a reduced-diameter grinding wheel.
  • a grinding wheel guard 5 is attached to the grinding wheel headl to protect the grinding wheel 3.
  • a motor 8 is attached opposite the grinding wheel 3 on the grinding wheel head I. The shaft end of the motor is fitted with a motor pulley 18 whose axis runs parallel to the grinding wheel spindle 2.
  • the motor 8 is fixed to a motor base 9 slidably mounted along a guide surface la formed on the grinding wheel head 1 perpendicular to the grinding wheel spindle 2 so that appropriate tension can be maintained on the V-belts 34 stretched between the pulley 4 or 33 mounted on the grinding wheel spindle 2 and the motor pulley 18 mounted on the motor shaft.
  • a hand wheel 12 moves the motor 8 via the motor base 9 in relation to the grinding wheel spindle 2.
  • a feed screw 11 penetrates a feed screw support 10 fixed to the grinding wheel head 1 and the feed screw is manipulated by the hand wheel 12.
  • a step 11a of the feed screw 11 and an end face 12a of the hand wheel 12 squeeze the side faces of the feed screw support 10 and in this condition the feed screw 11 is axially immovable during rotation.
  • the motor base 9 is shifted along the guide surface 14 and the slack in the V-belts 34 caused through exchange between the large-diameter low-speed pulley 4 and the smalldiameter high-speed pulley 33 is removed.
  • the hand wheel 12 is manipulated until the V-belts are adequately tensioned.
  • a plate 13 is fixed to the side face 1 on the pulley side of the grinding wheel head 1.
  • a link shaft 14 is supported by the plate 13.
  • the shaft 14 is rotatably passed through a fixing member 15 fixed on the plate 13 and the shaft is parallel to the grinding wheel spindle 2.
  • a rotatable boss 16 is solidly secured to the pulley side end 14' of the link shaft 14 by a set screw 17. Meanwhile, the other end 14" of the link shaft 14 is rotatably passed through a bushing 19 secured to the side face of the grinding wheel guard 5 as shown in FIG. 3.
  • the threaded end portions 14a of the link shaft 14 projects into the grinding wheel guard 5.
  • a lever 21 is fixed with 'nuts 20, 20 to the threaded end portions 14a and a large diameter grinding wheel rejecting pin 22 is fixed on the lever 21 by means of the threaded portion 22a and a nut 23, as shown in FIG. 3.
  • a rotatable arm 24 acting as a leaf spring is fixed to the rotatable boss 16.
  • a safety arm 26 is rotatably mounted by means of a support pin 27.
  • a high-speed pulley rejecting pin 25 which extends into a recess in the pulley 4 or 33 is secured to the safety ann 26, as shown in FIG. 3.
  • a guide slot 260 is formed for slidably receiving a guide pin 28.
  • the guide pin 28 is fastened on the grinding wheel head 1 through a support 29, as shown in FIG. 3.
  • Turning of the link shaft 14 can be accomplished by an operating lever 30.
  • This motion is transmitted by the rotatable arm 24 via the support pin 27 to the safety arm 26.
  • the operating lever 30 is made to fit into an engaging hole 31 or 32 provided on the plate 13 and the safety arm 26 slides along the guide slot 26a.
  • the high-speed pulley rejecting pin 25 provided at the end of the safety arm 26 occupies the position 25 or 25, as shown in FIG. 3.
  • the large-diameter grinding wheel rejecting pin 22 occupies the position 22, and when the lever 30 fits into the hole 32, the pin 22 occupies the position 22', shown in FIGS. 1 and 3
  • Safety is attained with the present arrangement in the following manner.
  • the positions of the motor 8 and the pulley 18 mounted on its shaft relative to the grinding wheel spindle 2 may be adjusted by the hand wheel 12.
  • the large-diameter grinding wheel rejecting pin 22 at the position 22' impedes the mounting of large-diameter (diameter a) grinding wheel 3.
  • the pin 22 must be moved to the position 22 in FIG. 1.
  • the operating lever is turned to the position where it fits into the hole 31 bored on the plate 13.
  • the high-speed pulley rejecting pin 25 of the safety arm 26 is restricted to the position 25' in FIG. 3 by the inside surface 33' of the small-diameter high-speed pulley 33 and thereby prevents the turning of the link shaft 14.
  • the hazard in a grinding operation is easily eliminated by a safety device simple in construction and easy to operate.
  • the high-speed pulley rejecting pin 25 is obstructed by the high-speed pulley 33. Accordingly, the mountingof a large-diameter grinding wheel having a diameter a is impossible because of the positions of the safet'yann 26 and the large-diameter grinding wheel-rejecting pin 22. Therefore, the low-speed pulley 4 must be mounted before a largediameter (diameter a) grinding wheel 3 can be mounted.
  • An apparatus for preventing circumferential overspeeding of a grinding wheel through exchange of small and largediameter grinding wheel spindle pulleys in a grinding machine wherein the rotary speed of the grinding wheel spindle is variable by pulley exchange comprising a grinding wheel head with the grinding wheel spindle rotatably mounted thereto and a motor connected to drive the grinding wheel spindle, operating means supported by a mounting plate'secured to the pulley side end face of the grinding wheel head, a large-diameter grinding wheel rejecting pin fixed to the operating means and constructed and arranged relative to the grinding wheel spindle to obstruct the space to beoccupied by a large-diameter v v grinding wheel on the spindle and thereb prevent the mounting of a large-diameter grinding wheel w en the small-diameter high-speed pulley is on the grinding wheel spindle, and a high-speed pulley rejecting pin fixed to the operating means and mechanically interlocked with the large-diameter
  • an apparatus as in claim 2 wherein the operating means includes a rotatable link shaft parallel to the grinding wheel spindle about midway between the grinding wheel spindle and the motor with the small-diameter high-speed pulley rejecting pin at the pulley side end of the link shaft and the large-diameter grinding wheel rejecting pin at the other end of the shaft.
  • the operating means further includes an operating lever secured to the link shaft and arranged to be fixed to said holes, and a safety arm, one end of the safety arm is connected to the operating lever and the other end thereof has the high-speed pulley rejecting pin.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US70040A 1969-09-16 1970-09-08 Apparatus for preventing circumferential overspeeding of grinding wheel Expired - Lifetime US3673741A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1969087926U JPS4720383Y1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1969-09-16 1969-09-16

Publications (1)

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US3673741A true US3673741A (en) 1972-07-04

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US70040A Expired - Lifetime US3673741A (en) 1969-09-16 1970-09-08 Apparatus for preventing circumferential overspeeding of grinding wheel

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US (1) US3673741A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS4720383Y1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2061412A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1254978A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4090331A (en) * 1976-06-23 1978-05-23 Toyoda-Koki Kabushiki-Kaisha Apparatus for preventing circumferential overspeeding of a grinding wheel
US4136490A (en) * 1976-11-30 1979-01-30 Toyoda-Koki Kabushiki-Kaisha Apparatus for preventing circumferential overspeeding of a grinding wheel
US4144677A (en) * 1976-05-13 1979-03-20 Lidkopings Mekaniska Verkstads Ab Overrunning protection for a grinding wheel
CN101829950A (zh) * 2010-05-06 2010-09-15 满城县永红铸造机械有限公司 一种安全高速砂轮机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2471561A (en) * 1945-10-25 1949-05-31 Fielding Edgar Charles Guard for grinding machines and the like
US2487949A (en) * 1948-03-11 1949-11-15 Carnegie Illinois Steel Corp Drive mechanism for grinding wheels
US3129534A (en) * 1961-10-10 1964-04-21 Nippon Toki Kaisha Ltd Safety apparatus for grinding machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2471561A (en) * 1945-10-25 1949-05-31 Fielding Edgar Charles Guard for grinding machines and the like
US2487949A (en) * 1948-03-11 1949-11-15 Carnegie Illinois Steel Corp Drive mechanism for grinding wheels
US3129534A (en) * 1961-10-10 1964-04-21 Nippon Toki Kaisha Ltd Safety apparatus for grinding machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4144677A (en) * 1976-05-13 1979-03-20 Lidkopings Mekaniska Verkstads Ab Overrunning protection for a grinding wheel
US4090331A (en) * 1976-06-23 1978-05-23 Toyoda-Koki Kabushiki-Kaisha Apparatus for preventing circumferential overspeeding of a grinding wheel
US4136490A (en) * 1976-11-30 1979-01-30 Toyoda-Koki Kabushiki-Kaisha Apparatus for preventing circumferential overspeeding of a grinding wheel
CN101829950A (zh) * 2010-05-06 2010-09-15 满城县永红铸造机械有限公司 一种安全高速砂轮机
CN101829950B (zh) * 2010-05-06 2012-10-17 满城县永红铸造机械有限公司 一种安全高速砂轮机

Also Published As

Publication number Publication date
FR2061412A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1971-06-18
JPS4720383Y1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1972-07-08
GB1254978A (en) 1971-11-24

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