US3830019A - Grinding machine with a safety housing - Google Patents

Grinding machine with a safety housing Download PDF

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Publication number
US3830019A
US3830019A US00319461A US31946172A US3830019A US 3830019 A US3830019 A US 3830019A US 00319461 A US00319461 A US 00319461A US 31946172 A US31946172 A US 31946172A US 3830019 A US3830019 A US 3830019A
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US
United States
Prior art keywords
loader
workpiece
cylindrical
grinding wheel
drum
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
US00319461A
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English (en)
Inventor
F Mann
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.)
Landis Tool Co
Original Assignee
Landis Tool Co
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 Landis Tool Co filed Critical Landis Tool Co
Priority to US00319461A priority Critical patent/US3830019A/en
Priority to DE2364197A priority patent/DE2364197C2/de
Priority to FR7347005A priority patent/FR2212775A5/fr
Priority to JP744306A priority patent/JPS564383B2/ja
Priority to CA189,198A priority patent/CA959268A/en
Priority to GB5997373A priority patent/GB1408090A/en
Application granted granted Critical
Publication of US3830019A publication Critical patent/US3830019A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • ABSTRACT A grinding machine comprising a grinding assembly including at least one grinding wheel and means for supporting the grinding wheel for rotation about the axis thereof, wall means for separating the operator of the grinding machine and the grinding wheel assembly whereby in the event that the grinding wheel explodes the operator will not be endangered, the wall means including an opening, a loader assembly selectively configured for placement within the opening, the loader assembly being displaceable from a first load position to a second grinding position and including means for receiving a workpiece when the loader assembly is at the first load position, means for retaining the workpiece in the receiving means as the loader assembly is displaced between the first position and the second position, and means for blocking the wall means opening when the loader assembly is at the first and second positions and at all positions intermediate the first and second positions.
  • a workpiece is rotatively driven at a rapid rate and a grinding wheel, which is also rotatively driven at a rapid rate, is displaced into abrasive engagement with the rotating workpiece to effect stock removal. If the workpiece has flaws therein, such abrasive engagement may rip off chips from the workpiece and these chips are randomly projected at a rapid velocity. Additionally, where the grinding wheel is defective or where the velocity of the grinding wheel is extremely high, the grinding wheel may explode. The safety of the machine operator is accordingly threatened whenever such chips or portions are released.
  • an object of the present invention to provide a grinding machine wherein a continuous wall will be established intermediate the grinding wheel and the machine operator throughout the grinding cycle.
  • Another advantage of the present invention is the provision of a grinding machine wherein the operator or any other person who may be in the immediate vicinity of the grinding machine will be protected in the event of grinding wheel explosion or the like.
  • FIG. 1 is an oblique elevational view of a high speed grinding machine made in accordance with the teachings of the present invention
  • FIG. 2 is a plan view partially broken away illustrating a portion of the grinding machine illustrated in FIG.
  • FIG. 3 is a view of the grinding machine illustrated in FIG. 1 taken along the lines 3-3 thereof with the loader assembly in the grinding position;
  • FIG. 4 is a partial view of the grinding machine illustrated in FIG. 3 with the loader assembly in the loadunload position.
  • the grinding machine includes a base 12, a stationary work table 14 which is mounted on the base, left and righthand headstocks 16, 18 which are supported by the work table and which include left and right-hand work centers 20, 22, a pair of motors 24, 26 for rotatably driving an arbor assembly 27 which supports a pair of workpieces W and which has been forcefully engaged by the work centers, a grinding wheel assembly 28 (FIG.
  • a loader assembly 30 for controlling the displacement of the loader assembly
  • a loader assembly housing 33 for controlling the displacement of the loader assembly
  • a grinding wheel assembly housing 34 having side, top and rear walls selectively dimensioned for displacement into the armor plated loader assembly housing 34 and adapted to be maintained in overlapping relation therewith during the grinding cycle whereby the grinding wheel assembly will be completely encased by the cooperating housings.
  • the housing are constructed from heavy rolled steel (armor) plate having a thickness l in.) sufficient to prevent passage therethrough of high speed fragments from an exploding grinding wheel or the like.
  • the grinding wheel assembly (FIG. 3) includes a grinding wheel support 36, a grinding wheel fender or hood 38, and at least one grinding wheel 40 which is supported for rotation about the axis of the grinding 'wheel and which is selectively, transversely displaceable towards and away from the arbor assembly 27.
  • the loader assembly 30 has a substantially drumshaped casing 42 having cylindrical sides 44 which are integrally joined to opposing, parallel, planar end plates 46.
  • the drum-shaped casing is of welded construction and the sides and ends thereof are also constructed from heavy rolled steel plate, with at least one circular opening or pocket 45 formed therein.
  • Coaxial channels 48 are defined in the end plates and inserts 50 are secured thereto by bolts or the like (not shown).
  • the end plates are sufficiently separated so that when the arbor assembly 27 which carries the workpieces is placed within the inserts, the ends of the arbor assembly will be inset from the outer surfaces of the end plates. Additionally, the inserts are selectively configured so that they will retain the received arbor assembly in the desired position.
  • Upwardly projecting insert flanges 52 preferably slidingly engage the inside surfaces of the arbor assembly ends to prevent axial displacement of the received arbor assembly.
  • Safety brackets 53 are secured to the base member and are selectively located to effectively capture the loader assembly inserts 50 when the loader assembly is rotated to the grinding position. Accordingly, should the work centers become disassociated from the arbor assembly during the grinding operation, the arbor asembly cannot be driven against the grinding wheel.
  • a portion of the cylindrical drum continuous with the channels is replaced by a planar inwardly inclined portion 54 so that the grinding wheel hood can be adjusted without interferring with the drum while the drum is in the grinding position.
  • the drum-shaped casing 42 is rotatively mounted to a shaft 56 which is supported by the grinding machine base and may be rotatively displaced from a first loadunload position (FIG. 4) to a second grinding position (FIG. 3) by means of a drum control mechanism 32.
  • the drum control mechanism (FIG. 3) includes a selectively operable fluid cylinder 58 which includes a piston head 60 and a piston rod 62.
  • the piston rod is operatively engaged with an arm member 64 which is pivotally mounted to a projecting stud 66 on one end plate of the drum-shaped casing.
  • a clevis bracket 68 is secured to the top of the cylinder and is pivotally mounted on an appropriate housingbracket 70.
  • the loader housing 34 includes a vertically stepped upper front panel 72 having a cylindrical bottom portion 74 (FIGS. 3 and 4), wing-like elements 76 secured to the side of the front panel at the bottom thereof, side plates 78, a base 80, which is secured to the grinding machine base 12 by means of clamps 81 and includes sides 82, a central portion 84 and a top portion 86 including a slidable viewing door 88 to enable the operator to view the grinding zone during the set up operation.
  • a switch 89 is provided on the loader assembly housing top wall 86 and is closed by a lug 90 which is integral with the viewing door whenever the viewing door is opened, to actuate the grinding machine controls 92 to reduce the speed of the grinding wheel to half-speed whereby danger due to the explosion of the grinding wheel will be minimized.
  • the central base portion 84 is spaced below the peripheral surface of the drumshaped casing 42 and cooperates with side portions 82 having a front 94 and rear upwardly projecting portions 96.
  • the cylindrical housing portion 74 spans the periphery of the cylindrical drum and has downwardly projecting front 98 and rear 100 portions.
  • the drum-shaped casing is accordingly effectively surrounded by the loader housing and cannot be radially displaced in the event of machine malfunction such as wheel blow up.
  • the machine operator can never pass his hands nor can projectiles pass through the opening in the front wall of the housing since the drum-shaped loader assembly casing continuously blocks this opening as the casing is rotated between the load-unload and grinding positions.
  • an arbor assembly is placed within the inserts when the loader assembly is at the load-unload position and the cylinder piston 60 is elevated thereby rotating the loader assembly clockwise to the grinding position.
  • Spindles of the head stocks 16, 18 are ad vanced until the work centers thereof forcefully engage the arbor assembly and the arbor assembly is then rotated by the head stocks.
  • the opening 45 is shaped so that liquid coolant directed against the workpiece as best illustrated in FIG. 3 is collected in the opening to submerge the workpiece in a continuous bath of coolant during the grinding operation.
  • the grinding wheel is then advanced at predetermined infeed rates, until the workpieces are ground to final size.
  • the grinding wheel is then retracted and the loader assembly is rotated counterclockwise to the load-unload position where the arbor assembly with the finished workpieces can be removed.
  • a cylindrical grinding machine comprising a pair of opposing work centers for selectively engaging and rotating a workpiece located therebetween about the axis defined by said work centers,
  • a grinding wheel assembly including at least one grinding wheel and means for radially advancing said grinding wheel towards a rotating workpiece whereby stock will be removed from the periphery thereof, 7 wall means for separating the operator of the cylindrical grinding machine and said grinding wheel whereby in the event that said grinding wheel explodes the operator will not be endangered, said wall means including an opening therein, a drum-shaped loader selectively configured for placement within said opening and having a cylindrical continuous casing having a single slot extending peripherally around a predetermined angular segment of said casing and extending axially from one end of said casing to the other end thereof, and a pair of end walls each having a selectively configured opening contiguous with said casing slot for receiving and retaining a workpiece as said drumshaped loader is rotated about the axis thereof from a load position to an advanced position where said work centers can selectively engage and rotate the retained workpiece,
  • end walls further comprise means for preventing the axial displacement of a workpiece received by and retained in said end walls.
  • a cylindrical grinding machine according to claim 1, further comprising means for preventing the disassociation of the workpiece and said loader end walls when said loader is at said advanced position.
  • a cylindrical grinding machine according to claim 1, wherein said wall means further includes means for preventing the radial displacement of said loader.
  • a cylindrical grinding machine according to claim 1, wherein said wall means further comprises upper and lower cylindrical portions for matingly extending, in spaced relation to the top and bottom portions of said cylindrical casing respectively.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
US00319461A 1972-12-29 1972-12-29 Grinding machine with a safety housing Expired - Lifetime US3830019A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00319461A US3830019A (en) 1972-12-29 1972-12-29 Grinding machine with a safety housing
DE2364197A DE2364197C2 (de) 1972-12-29 1973-12-22 Schutzeinrichtung an einer Hochgeschwindigkeitsschleifmaschine
FR7347005A FR2212775A5 (cg-RX-API-DMAC7.html) 1972-12-29 1973-12-28
JP744306A JPS564383B2 (cg-RX-API-DMAC7.html) 1972-12-29 1973-12-28
CA189,198A CA959268A (en) 1972-12-29 1973-12-28 Grinding machine
GB5997373A GB1408090A (en) 1972-12-29 1973-12-28 Grinding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00319461A US3830019A (en) 1972-12-29 1972-12-29 Grinding machine with a safety housing

Publications (1)

Publication Number Publication Date
US3830019A true US3830019A (en) 1974-08-20

Family

ID=23242342

Family Applications (1)

Application Number Title Priority Date Filing Date
US00319461A Expired - Lifetime US3830019A (en) 1972-12-29 1972-12-29 Grinding machine with a safety housing

Country Status (6)

Country Link
US (1) US3830019A (cg-RX-API-DMAC7.html)
JP (1) JPS564383B2 (cg-RX-API-DMAC7.html)
CA (1) CA959268A (cg-RX-API-DMAC7.html)
DE (1) DE2364197C2 (cg-RX-API-DMAC7.html)
FR (1) FR2212775A5 (cg-RX-API-DMAC7.html)
GB (1) GB1408090A (cg-RX-API-DMAC7.html)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5725418A (en) * 1993-09-10 1998-03-10 Giebmanns; Thomas Grinding unit
CN102794709A (zh) * 2012-09-06 2012-11-28 刘凯 防爆砂轮机
CN110936262A (zh) * 2019-11-20 2020-03-31 益模钢模五金(深圳)有限公司 一种便于清理加工碎屑的磨床

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58182724A (ja) * 1982-04-19 1983-10-25 Sharp Corp 交流制御装置
JP4941095B2 (ja) * 2007-05-22 2012-05-30 住友電装株式会社 端子金具

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2714926A (en) * 1952-06-06 1955-08-09 Wagner & Swasey Company Splash guards for machine tools
US2899779A (en) * 1959-08-18 Rotary work carriers for disc grinders
US3073074A (en) * 1959-08-12 1963-01-15 Landis Tool Co Work handling mechanism for rotary grinder
US3269063A (en) * 1964-01-17 1966-08-30 Heald Machine Co Grinding machine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE570343C (de) * 1925-09-28 1933-02-20 Norton Co Maschine zum Schleifen von Rollen und sonstigen zylindrischen Koerpern
US3046706A (en) * 1960-03-25 1962-07-31 Landis Tool Co Automatic plunge grinder
US3694971A (en) * 1970-08-31 1972-10-03 Cincinnati Milacron Inc Guard system for high speed grinder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899779A (en) * 1959-08-18 Rotary work carriers for disc grinders
US2714926A (en) * 1952-06-06 1955-08-09 Wagner & Swasey Company Splash guards for machine tools
US3073074A (en) * 1959-08-12 1963-01-15 Landis Tool Co Work handling mechanism for rotary grinder
US3269063A (en) * 1964-01-17 1966-08-30 Heald Machine Co Grinding machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5725418A (en) * 1993-09-10 1998-03-10 Giebmanns; Thomas Grinding unit
CN102794709A (zh) * 2012-09-06 2012-11-28 刘凯 防爆砂轮机
CN110936262A (zh) * 2019-11-20 2020-03-31 益模钢模五金(深圳)有限公司 一种便于清理加工碎屑的磨床

Also Published As

Publication number Publication date
FR2212775A5 (cg-RX-API-DMAC7.html) 1974-07-26
DE2364197C2 (de) 1983-09-08
DE2364197A1 (de) 1974-07-11
GB1408090A (en) 1975-10-01
CA959268A (en) 1974-12-17
JPS4997386A (cg-RX-API-DMAC7.html) 1974-09-13
JPS564383B2 (cg-RX-API-DMAC7.html) 1981-01-29

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