US3369328A - Abrading machinery - Google Patents

Abrading machinery Download PDF

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Publication number
US3369328A
US3369328A US430826A US43082665A US3369328A US 3369328 A US3369328 A US 3369328A US 430826 A US430826 A US 430826A US 43082665 A US43082665 A US 43082665A US 3369328 A US3369328 A US 3369328A
Authority
US
United States
Prior art keywords
pressure
valve
abrading
workpiece
piston
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
US430826A
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English (en)
Inventor
Conrad T Freerks
Ralph W Reed
James E Whelan
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.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing 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 Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Priority to US430826A priority Critical patent/US3369328A/en
Priority to DE19661577407 priority patent/DE1577407A1/de
Priority to GB4006/66A priority patent/GB1130714A/en
Priority to SE01607/66A priority patent/SE326119B/xx
Application granted granted Critical
Publication of US3369328A publication Critical patent/US3369328A/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
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/16—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the load
    • 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
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • 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
    • B24B47/20—Drives or gearings; Equipment therefor relating to feed movement

Definitions

  • This invention relates to abrading machinery and is particularly concerned with an improved workfeed device.
  • the prior art devices employing hydraulic or pneumatic pressure typically provided either full pressure or no pressure at all, leaving the operator no leeway for instantaneous variation of pressure. Further, most of the prior art workfeed devices were designed for use with grinding wheels. Grinding wheels lack resilience, and exceeding the pressure recommended by the manufacturer may cause the wheel to explode. Additionally, all grinding wheels wear substantially in use, thereby making it diicult to maintain precision tolerances. Modern coated abrasive belts overcome many of the drawbacks of grinding wheels, providing a strong-fast-cutting durable abrading means which can be entrained over a contact wheel or a platen and held to quite precise tolerances. Although the device of our invention may be used in connection with any abrading means, it finds particular utility in connection with abrasive belt machines.
  • the workfeed device of our invention enables an operator, for the first time so far as we are aware, to use both hands to guide a workpiece while at the same time precisely and continuously controlling the force urging the workpiece against the abrading means.
  • Pressure can be either increased or decreased almost instantaneously, and in the degree desired, whether gross or minute.
  • FIGURE 1 is a view in perspective of a preferred embodiment of our invention
  • FIGURE 2 is a rear elevational view of the device of FIGURE 1;
  • FIGURE 3 is a side elevational view of the device of FIGURE 1, with certain portions broken away to facilitate understanding;
  • FIGURE 4 is a cross-sectional view of an infinitely variable quick-operating pressure control valve which plays an important part in our invention.
  • the device 10 comprises base 11, which may be bolted in a desired location on the door.
  • column 12 Extend ing vertically upward from base 11 is column 12, which supports and is surrounded by, at its upper portion, sleeve 13.
  • work table 14 At the upper end of sleeve 13 is horizontally positioned work table 14, on which is mounted horizontally adjustable block 15.
  • Attached to block 1S is fluid-actuated pressure cylinder 16, within which is mounted piston 17, to the end of which is affixed pusher plate 18.
  • piston 17 is forced outward, and a workpiece W, positioned on the top of table 14, is forced against abrasive belt A, which is entrained over contact wheel C.
  • One of the desirable features of our invention is the constant angle at which a workpiece is forced against the abrading medium, even when piston 17 and pusher plate 18 traverse an extended stroke.
  • the specific conformation of pusher plate 18 will, of course, be determined by the shape of workpiece W, and we contemplate the use of a variety of interchangeable pusher plates.
  • air is supplied through supply line 19, passing through air filter 20, past line pressure gauge 21, and line pressure control valve 22.
  • the air then passes through line oiler 23 and hose 24 to variable pressure control valve 25, entering through inlet 26 and 1eaving through outlet 27.
  • air line 30 containing speed control valve 28 and quick release (or dump) valve 29.
  • Speed control valve 28 may be adjusted to establish the rate at which pressure changes when variable pressure control valve 25 is actuated, thereby in turn controlling the rate at which the pressure is increased in line 30.
  • Quick releasevalve 29 permits piston 17 to move quickly away from contact wheel C when variable pressure control valve 25 is closed; 4
  • a coil-spring S as is particularly shown in the partially cut away portion of FIG- URE 3 may enclose the piston rod of piston 17, being positioned between the head of piston and the forward end of cylinder 16.
  • variable control valve 25 is operated by kneeactuated lever 33, to the outer extremity of which is afxed pad 34.
  • Lever 33 and valve 25 are both adjustable to an appropriate height by means of U-bolt32, which surrounds column 12.
  • Coil-spring 36 positioned between the inner end of lever 33 and valve 25 returns lever 33 to its original position after the pressure has been removed,
  • FIGURES 2 and 3 illustrate a convenient way in which the height of table 14 may be changed, while simultaneously imparting greater stability to the entire assembly.
  • U-bolt 39 surrounds sleeve 13, passing through and firmly holding bar 40.
  • braces 41 and 41a which are connected to the oor forward of the assembly.
  • Turnbuckles 42 and 42a connect the separated ends of braces of 41 and 41a respectively.
  • This operation may be further facilitated by surrounding column 12 with a coil spring, the lower end of which bears against, e.g., U-bolt 32, and the upper end of which bears against the under surface of table 14, thereby providing a more or less floating arrangement when lock handle 38 is loosened and turnbuckles 41 and 41a are adjusted.
  • a coil spring the lower end of which bears against, e.g., U-bolt 32, and the upper end of which bears against the under surface of table 14, thereby providing a more or less floating arrangement when lock handle 38 is loosened and turnbuckles 41 and 41a are adjusted.
  • Valve 25 comprises sub-housing sections 52, 53, and 54. Clamped between sub-housings 52 and 53 is diaphragm 55, in the center of which is flange 56. A tight seal between section 53 and sections 52 and 54 is provided by diaphragm 55 and O-ring 65.
  • plunger 59 Positioned within housing 52, and replacing the normal screw-threaded pressure adjustment device of a conventional pressure regulator valve, is plunger 59, having across the end which contacts metal ⁇ center portion 57, a diametric slot 60, which is aligned with hole 58.
  • Bolt in lever face 33a normally bears lightly against the outer end of plunger 59.
  • the head of bolt 35 is forced against the outer end of plunger 59, which in turn transmits force, through metal center 57 of diaphragm 55, to valve stem 61a of poppet valve 61, thereby forcing seat 67 of poppet valve 61 away from tubular center 53a.
  • O-ring 66 surrounds valve 61, insuring alignment. Normally air under line pressure is admitted at inlet 26, but does not pass beyond the chamber immediately adjacent inlet 26. When, however, valve 67 is moved from its normal seat, air flows from inlet 26 between poppet valve base 67 and its seat on tubular core 53a, through hole 63 and thence through outlet 27. The air then equalizes the pressure on diaphragm by passing through hole 64, thereby applying pneumatic force on theleft side of diaphragm 55 to equalize the mechanical force being applied to Athe right side thereof. To increase the pressure at outlet 27, the operator increases the force applied to knee pad 34, the valve adjusting to the changed conditions in the manner just indicated.
  • An abrading machine comprising an abrading means and a Workfeed device which comprises in combination: a horizontal table for supporting a workpiece, a block on the upper face of said table adjustably mounted for movement toward and away from said abrading means, a pneumatic cylinder affixed to said block, said cylinder containing a horizontally movable piston having a workpiece-urging pusher plate connected to the external end thereof, a vertically adjustable support for said table, an air line for supplying compressed air to said cylinder, a valve in said air line for either quickly or slowly increasing or decreasing the pressure of air in said cylinder, and, a knee activated control for said infinitely adjustable pressure control valve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
US430826A 1965-02-08 1965-02-08 Abrading machinery Expired - Lifetime US3369328A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US430826A US3369328A (en) 1965-02-08 1965-02-08 Abrading machinery
DE19661577407 DE1577407A1 (de) 1965-02-08 1966-01-13 Schleifvorrichtung
GB4006/66A GB1130714A (en) 1965-02-08 1966-01-28 Abrading machinery
SE01607/66A SE326119B (enrdf_load_stackoverflow) 1965-02-08 1966-02-08

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US430826A US3369328A (en) 1965-02-08 1965-02-08 Abrading machinery

Publications (1)

Publication Number Publication Date
US3369328A true US3369328A (en) 1968-02-20

Family

ID=23709215

Family Applications (1)

Application Number Title Priority Date Filing Date
US430826A Expired - Lifetime US3369328A (en) 1965-02-08 1965-02-08 Abrading machinery

Country Status (4)

Country Link
US (1) US3369328A (enrdf_load_stackoverflow)
DE (1) DE1577407A1 (enrdf_load_stackoverflow)
GB (1) GB1130714A (enrdf_load_stackoverflow)
SE (1) SE326119B (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3603120A (en) * 1968-06-03 1971-09-07 Bata Shoe Co Of Canada Ltd Apparatus for roughing the overlasted portions of the bottoms of shoe uppers
US3629977A (en) * 1969-12-19 1971-12-28 Norton Co Work-feeding device
US3648415A (en) * 1970-10-07 1972-03-14 Fox Grinders Inc Apparatus for feeding work to a grinder wheel
US3668814A (en) * 1970-03-30 1972-06-13 Minnesota Mining & Mfg Surface grinding device
US3691697A (en) * 1970-09-21 1972-09-19 Hamco Mach & Elect Co Pressure control for lapping device
US3721045A (en) * 1969-10-24 1973-03-20 Pettibone Corp Pressure control system for a grinding machine and actuating unit therefor
US3771267A (en) * 1972-05-26 1973-11-13 Fargo Machine & Tool Co Work-holding and advancing table
US3816998A (en) * 1970-05-18 1974-06-18 Timesavers Inc Method of and apparatus for rapidly abrading metal workpieces
US3896592A (en) * 1974-05-06 1975-07-29 Aladdin Mfg Apparatus for sharpening blades
US3918213A (en) * 1974-07-01 1975-11-11 Chicago Pneumatic Tool Co Overspeed safety control mechanism for rotary tools
USRE31620E (en) * 1976-05-27 1984-07-03 Minnesota Mining And Manufacturing Co. Coated abrasive product containing fused zirconia grains and method for abrading iron
US4870730A (en) * 1987-10-13 1989-10-03 Belknap John C Tool mounting construction
US12268248B2 (en) * 2019-06-18 2025-04-08 Kt&G Corporation Aerosol generating device and operating method therefor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US280033A (en) * 1883-06-26 Benjamin h
US1422749A (en) * 1920-12-30 1922-07-11 Dameron Adolphus Work holder
US1442041A (en) * 1920-09-11 1923-01-16 Westinghouse Electric & Mfg Co Grinder regulator system
US1875486A (en) * 1932-09-06 Corporated
US2148369A (en) * 1937-03-06 1939-02-21 Tabor Mfg Co Cut-off machine
US2462788A (en) * 1946-04-08 1949-02-22 Hammond Machinery Builders Inc Worktable for belt grinders and the like
US2686994A (en) * 1952-10-10 1954-08-24 Peninsular Grinding Wheel Co Work feed device for grinding machines

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US280033A (en) * 1883-06-26 Benjamin h
US1875486A (en) * 1932-09-06 Corporated
US1442041A (en) * 1920-09-11 1923-01-16 Westinghouse Electric & Mfg Co Grinder regulator system
US1422749A (en) * 1920-12-30 1922-07-11 Dameron Adolphus Work holder
US2148369A (en) * 1937-03-06 1939-02-21 Tabor Mfg Co Cut-off machine
US2462788A (en) * 1946-04-08 1949-02-22 Hammond Machinery Builders Inc Worktable for belt grinders and the like
US2686994A (en) * 1952-10-10 1954-08-24 Peninsular Grinding Wheel Co Work feed device for grinding machines

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3603120A (en) * 1968-06-03 1971-09-07 Bata Shoe Co Of Canada Ltd Apparatus for roughing the overlasted portions of the bottoms of shoe uppers
US3721045A (en) * 1969-10-24 1973-03-20 Pettibone Corp Pressure control system for a grinding machine and actuating unit therefor
US3629977A (en) * 1969-12-19 1971-12-28 Norton Co Work-feeding device
US3668814A (en) * 1970-03-30 1972-06-13 Minnesota Mining & Mfg Surface grinding device
US3816998A (en) * 1970-05-18 1974-06-18 Timesavers Inc Method of and apparatus for rapidly abrading metal workpieces
US3691697A (en) * 1970-09-21 1972-09-19 Hamco Mach & Elect Co Pressure control for lapping device
US3648415A (en) * 1970-10-07 1972-03-14 Fox Grinders Inc Apparatus for feeding work to a grinder wheel
US3771267A (en) * 1972-05-26 1973-11-13 Fargo Machine & Tool Co Work-holding and advancing table
US3896592A (en) * 1974-05-06 1975-07-29 Aladdin Mfg Apparatus for sharpening blades
US3918213A (en) * 1974-07-01 1975-11-11 Chicago Pneumatic Tool Co Overspeed safety control mechanism for rotary tools
USRE31620E (en) * 1976-05-27 1984-07-03 Minnesota Mining And Manufacturing Co. Coated abrasive product containing fused zirconia grains and method for abrading iron
US4870730A (en) * 1987-10-13 1989-10-03 Belknap John C Tool mounting construction
US12268248B2 (en) * 2019-06-18 2025-04-08 Kt&G Corporation Aerosol generating device and operating method therefor

Also Published As

Publication number Publication date
DE1577407A1 (de) 1970-01-08
SE326119B (enrdf_load_stackoverflow) 1970-07-13
GB1130714A (en) 1968-10-16

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