US3726048A - Grinding wheel guard device - Google Patents

Grinding wheel guard device Download PDF

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Publication number
US3726048A
US3726048A US00123223A US3726048DA US3726048A US 3726048 A US3726048 A US 3726048A US 00123223 A US00123223 A US 00123223A US 3726048D A US3726048D A US 3726048DA US 3726048 A US3726048 A US 3726048A
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US
United States
Prior art keywords
grinding wheel
grinding
wheel guard
guard
shaft member
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 - Lifetime
Application number
US00123223A
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English (en)
Inventor
H Ota
T Fujii
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.)
Toyoda Koki KK
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Toyoda Koki KK
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 Toyoda Koki KK filed Critical Toyoda Koki KK
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Publication of US3726048A publication Critical patent/US3726048A/en
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Classifications

    • 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
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/04—Protective covers for the grinding wheel
    • B24B55/045—Protective covers for the grinding wheel with cooling means incorporated
    • 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
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/04—Protective covers for the grinding wheel

Definitions

  • a grinding machine is provided with a grinding wheel Forelgn Applwatlon Pmmty Data guard pivotally mounted on the rear end of a grinding Mar. 13, 1970 Japan ..45/24701 Wheel head and a driving means is operatively nected to the grinding wheel guard for automatically 52 us. c1. ..51/269, 51/272, 241/285 B raising the grinding wheel guard by Pivotally rotating [51] Int. Cl.
  • the present invention relates generally to grinding machines and more particularly to a grinding wheel guard device for a grinding machine which is automatically upwardly opened to be disposed on the opposite side of the normal grinding position for permitting a worn grinding wheel to be exchanged and is subsequently automatically lowered to a closed position.
  • Another object of the present invention is to provide a grinding wheel guard which has improved safety characteristics in its operation and is simple in construction, yet is highly effective and reliable; in. performance.
  • a still further object of the present invention is to provide a grinding wheel guard which may automatically be quickly and safely displaced from and returned to its nonnal grinding wheel guarding position.
  • a grinding wheel guard for use in a grinding machine which is pivotally mounted on the rear end of the grinding wheel head.
  • a reversible motor is drivingly connected with the grinding wheel guard for rotating the guard upwardly about its pivot axis to position it on the opposite side of the normal grinding position for permitting the grinding wheels normally covered thereby to be dressed or exchanged, and for returning the guard to its original closed, or guarding, position when a grinding operation is being carried out.
  • FIG. 1 is a plan view of a grinding wheel guard device constructed in accordance with the teachings of the present invention
  • FIG. 2 is a sectional view taken along line II-ll of FIG. 1;
  • FIG. 3 is a sectional view taken along the line IlI-III of FIG. 1.
  • a grinding wheel spindle 2 having a plurality of grinding wheels 3 supported thereon in predetermined spaced relation, is rotatably mounted on a grinding wheel head 1.
  • a grinding wheel guard or cover 8 is secured to the grinding wheel head 1 by means of clamping fixtures 13 passing through side plates 12 which are integrally formed on or suitably attached to opposite sides of the grinding wheel guard 8.
  • An opening having a cover plate 4 pivotally disposed thereover is provided on the upper part of the grinding wheel guard 8 for adjusting a dressing device and the like positioned therebelow.
  • a coolant cover 5 having a coolant nozzle 6 thereon for supplying a cooling fluid between the grinding wheels 3 and a workpiece not shown.
  • a gear box 9 is provided on one side of the grinding wheel head 1, as shown in FIG. 1.
  • a shaft 10 is shown being rotatably journaled on bearing supports in the gear box 9.
  • the shaft 10 has a flange 10a on one end thereof which projects from the grinding wheel guard side of the gear box 9 and. is secured to a disc member 14 attached to the adjacent side of the grinding wheel guard 8 through a plate 24a.
  • the other end of the shaft 10 is secured to the bearing means in the usual manner by a nut for preventing axial movement of the shaft 10.
  • a worm wheel 11 is concentrically keyed to the shaft 10.
  • a worm shaft 16 Rotatably mounted on the gear box 9 through suitable bearing means, as shown in FIG. 2, and aligned perpendicular to the shaft 10 and positioned therebelow is a worm shaft 16 having a worm 15 formed on the middle portion thereof which operatively engages the worm wheel 1 l.
  • a sprocket 17 and a hand wheel 18 are keyed to the shaft 16 at one end thereof, being positioned adjacent each other and providing means for manually opening and closing the grinding wheel guard 8 in the manner set forth hereinbelow.
  • the sprocket 17 is operatively connected with a sprocket 20 mounted on an output shaft of a driving motor 21, as shown in FIG. 3, through a continuous drive chain 19 for driving the shaft 16.
  • a casing 22 is fixedly mounted on the side of the grinding wheel head 1 opposite that on which the gear box 9 is disposed.
  • a shaft 23 is rotatably mounted in the casing 22 through suitable bearing means.
  • a flange 23a integrally formed on the shaft 23 is secured to the adjacent side of the grinding wheel guard 8 through a plate 24.
  • a hollow shaft 25 is secured on the upper and rear portion of the grinding wheel guard 8, being arranged parallel to the axes of the grinding wheels 3.
  • the disc plate 14 and the flange 23a are fixedly secured on respective sides of the hollow shaft 25 and the shafts 10 and 23 are coaxially aligned with the hollow shaft 25.
  • the grinding wheel guard 8 can be pivotally moved about the axis of the hollow shaft 25, or in other words, the grinding wheel guard 8 can be opened upwardly and rearwardly away from a normal grinding position and shut by operation of the driving motor 21 or by manually turning the hand wheel 18.
  • Limit switches 28 and 27 are secured on the gear box 9 with a predetermined space established therebetween for recognizing completion of the opening and closing movements, respectively, of the grinding wheel guard 8 by means of engagement therewith of a dog plate 26 mounted on the grinding wheel guard 8.
  • the clamping fixtures 13 are released and removed.
  • the grinding wheel guard 8 is free from its usual clamped condition on the grinding wheel head 1.
  • the driving motor 21 is actuated to rotate the worm 15 on the shaft 16 through the sprockets 17 and 20 and the continuous drive chain 19.
  • the wonn wheel 11 mounted on the shaft 10 is rotated through the meshing engagement of the worm 15 and the worm wheel 11, whereby the grinding wheel guard 8 is upwardly rotated or opened about the axis of the hollow shaft by means of rotation of the shaft 10 which is integrally connected with the hollow shaft 25 until it has been retracted to its upper or fully open position which is opposite of the usual grinding position, as shown in FIG. 2 by the dotted line illustration.
  • the operation of the driving motor 21 is halted and the pivotal movement of the grinding wheel guard 8 is likewise stopped.
  • the grinding wheel spindle 2 having the worn grinding wheels 3 thereon is replaced with another spindle 2 having new grinding wheels thereon.
  • the driving motor 21 is reversely rotated for pivotally moving the grinding wheel guard 8 to the original position thereof, or for shutting the grinding wheel guard 8, through reverse rotation of the worm wheel 11.
  • the hand wheel 18 may be utilized for manually opening and shutting the grinding wheel guard 8.
  • the present invention provides an improved grinding wheel guard device wherein the grinding wheel guard is pivotally mounted on the rear end of a grinding wheel head and may be upwardly rotated to be disposed on the opposite side of the normal grinding position by a suitable powered driving means, whereby the grinding wheel guard is automatically opened. Accordingly, when a spindle which has grinding wheels thereon is to be exchanged with another such spindle, or the dressing device and the like of the apparatus is to be adjusted, the grinding wheel guard is automatically retracted or opened from its original position to another position where the grinding wheel guard does not obstruct the aforedescribed operation without using a conventional crane or the like.
  • the grinding wheel guard device may be stopped in any position during the operation of opening or shutting the same, even if the driving means fails to rotate because of trouble therewith or because of an electric power supply failure.
  • the grinding wheel guard device according to the present invention is extremely reliable and offers safety features not previously afforded by former guards.
  • drive means mounted on said grinding wheel head being operably connected with said first shaft member for moving said grinding wheel guard relative to said grinding wheel head;
  • said drive means comprising a worm wheel keyed to said first shaft member, a second shaft member rotatably mounted on said grinding wheel head and a worm gear disposed on said second shaft member for rotation therewith being operably engaged with said worm wheel for causing said first shaft member supporting said grinding wheel guard to rotate, whereby pivotable movement of said grinding wheel guard relative to said grinding wheel head is effected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US00123223A 1970-03-13 1971-03-11 Grinding wheel guard device Expired - Lifetime US3726048A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1970024701U JPS5321831Y1 (enExample) 1970-03-13 1970-03-13

Publications (1)

Publication Number Publication Date
US3726048A true US3726048A (en) 1973-04-10

Family

ID=12145464

Family Applications (1)

Application Number Title Priority Date Filing Date
US00123223A Expired - Lifetime US3726048A (en) 1970-03-13 1971-03-11 Grinding wheel guard device

Country Status (3)

Country Link
US (1) US3726048A (enExample)
JP (1) JPS5321831Y1 (enExample)
FR (1) FR2084634A5 (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3808749A (en) * 1971-07-06 1974-05-07 Tos Hostivar Np Safety guards for grinding wheels
FR2548074A1 (fr) * 1983-06-29 1985-01-04 Hauni Werke Koerber & Co Kg Capot de protection de la meule pour une rectifieuse plane
CN109202626A (zh) * 2017-06-30 2019-01-15 湖北德宜智精密机械有限公司 鼓式汽车刹车片磨床

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1550712A (en) * 1923-08-24 1925-08-25 Us Electrical Tool Company Grinding machine
US1694340A (en) * 1927-07-11 1928-12-04 Safety Grinding Wheel & Machin Grinding machine
US2011108A (en) * 1934-05-24 1935-08-13 American Laundry Mach Co Safety guard for abrasive wheels
US2368225A (en) * 1943-06-29 1945-01-30 August A Lebermann Utility tooth rest
US2655067A (en) * 1947-12-24 1953-10-13 Bechler Andre Guard device for machine tools

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1550712A (en) * 1923-08-24 1925-08-25 Us Electrical Tool Company Grinding machine
US1694340A (en) * 1927-07-11 1928-12-04 Safety Grinding Wheel & Machin Grinding machine
US2011108A (en) * 1934-05-24 1935-08-13 American Laundry Mach Co Safety guard for abrasive wheels
US2368225A (en) * 1943-06-29 1945-01-30 August A Lebermann Utility tooth rest
US2655067A (en) * 1947-12-24 1953-10-13 Bechler Andre Guard device for machine tools

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3808749A (en) * 1971-07-06 1974-05-07 Tos Hostivar Np Safety guards for grinding wheels
FR2548074A1 (fr) * 1983-06-29 1985-01-04 Hauni Werke Koerber & Co Kg Capot de protection de la meule pour une rectifieuse plane
CN109202626A (zh) * 2017-06-30 2019-01-15 湖北德宜智精密机械有限公司 鼓式汽车刹车片磨床

Also Published As

Publication number Publication date
FR2084634A5 (enExample) 1971-12-17
JPS5321831Y1 (enExample) 1978-06-07

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