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Manufacturers Index - Thompson Grinder Co.

Thompson Grinder Co.
Springfield, OH; Dayton, OH, U.S.A.
Manufacturer Class: Metal Working Machinery

Patents
This page contains information on patents issued to this manufacturer.

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Patent Number Date Title Name City Description
1,978,181 Oct. 23, 1934 Hydraulically driven surface grinding machine Joseph R. Whittles Rockford, IL
2,068,529 Jan. 19, 1937 Grinding Machine William G. Baldenhofer Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,113,287 Apr. 05, 1938 Machine for Grinding and Sharpening Broaches William G. Baldenhofer Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,138,811 Dec. 06, 1938 Surface Hardening Lathe Bed Philber A. Abe Sidney, Shelby County, OH Toulmin & Toulmin - patent attorneys

My invention relates to a new article of manufacture for use as a lathe bed, and a process of producing it. It is my object to produce a lathe bed, which can be cast and machined, and thereafter be surface hardened. It is a further object to provide a novel alloy susceptible to the heat treatment and hardening process of this invention. It is my object to provide a type of material for use in lathe beds which can be surface hardened.

This patent number was seen on Cincinnati Milling Machine Co. and Thompson Grinder Co. patent plates.
2,154,947 Apr. 18, 1939 Hardening Metal Surfaces Arthur H. Lloyd , England Application in Great Britain, 20 Jun 1936.

This patent number was seen on Cincinnati Milling Machine Co. and Thompson Grinder Co. patent plates.
    Hardening Metal Surfaces Herbert H. Beeny , England  
2,157,948 May. 09, 1939 Hardening of Metal Surfaces Herbert H. Beeny , England Dyke, Calver & Gray - patent attorneys

This patent number was seen on Cincinnati Milling Machine Co. and Thompson Grinder Co. patent plates.


This invention relates to the treatment of ferrous surfaces such as are capable of being hardened by being locally heated by means of a burner to a high temperature and then immediately cooled. The flame is progressively applied to the surface at a predetermined rate, the arrangement being such that there is not sufficient time for the heat to be conducted away to the interior of the article before the surface of the latter is quenched. The specification accompanying the co-pending patent application of myself and Arthur H. Lloyd, Serial No. 148,752 describes a particularly satisfactory burner and cooler for treating a ferrous (for example, a cast-iron) surface in this way, and also an unproved form of burner. It is now found that in treating the surface of a cast-iron V-rail in this way there is a tendency for cracks to form along the apex of the rail. This is probably due to the fact of the flames, acting on the flanks of the rail, heating the apex of the rail to too great an extent, this resulting in the apex of the rail being hardened to a greater depth than the flanks of the rail. When a V-rail is to be used as an inverted-V-rail for supporting a machine-tool slide, it is unnecessary for its apex to be hardened as the load is taken by the flanks of the rail. The present invention is concerned with the surface-hardening of the operative face of a V-rail, to be used for supporting a machine-tool slide or some other slide, by flame-heating the flanks of the rail and immediately thereafter cooling them, as specified above; and it involves means acting to prevent the apex of the rail from being hardened in this manner so that the hardened flanks of the rail will be separated from one another by a relatively soft surface along the apex of the rail. Preferably the said means includes a jet of water or other cooling medium arranged to impinge on the apex of the rail in the vicinity of where the flanks are being flame heated, the said jet preferably being directed backwardly. Conveniently the cooling medium from this jet is delivered at a higher pressure than that from the main jets.
2,216,308 Oct. 01, 1940 Method and Means for Balancing Grinding Wheels Edwin C. Ballman St. Louis, MO This patent was listed on a Thompson Grinder Co. patent plate.
2,216,800 Oct. 08, 1940 Hydraulic Control Device William G. Baldenhofer Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,231,233 Feb. 11, 1941 Process of finishing materials Henry Vienhaus Springfield, OH This patent number was listed on a Thompson Grinder Co. machine plaque.
2,252,877 Aug. 19, 1941 Way Grinding Machine Christian Baldenhofer Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,294,492 Sep. 01, 1942 Dresser Attachment for Grinding Machines John C. Wilson Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,294,493 Sep. 01, 1942 Apparatus for Wheel Dressing John C. Wilson Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,294,494 Sep. 01, 1942 Grinding Wheel Dresser John C. Wilson Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,315,104 Mar. 30, 1943 Inclinable grinder spindle William G. Baldenhofer Springfield, OH This patent number was listed on a Thompson Grinder Co. machine plaque.
2,321,442 Jun. 08, 1943 Collapsible antifriction nut John Clifford Wilson Springfield, OH
2,325,296 Jul. 27, 1943 Lubricant Seal for Shafts William G. Baldenhofer Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,334,238 Nov. 16, 1943 Surface Grinder Spindle Bearing William G. Baldenhofer Springfield, Clark County, OH Original application 22 Dec., 1941. Divided and this application 03 Aug., 1942.

This patent was listed on a Thompson Grinder Co. patent plate.
2,335,625 Nov. 30, 1943 Grinding Machine John C. Wilson Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
D137,121 Jan. 25, 1944 Design for a grinding machine John C. Wilson Springfield, OH
2,349,602 May. 23, 1944 Hydraulic System for Plural Machine Tools William G. Baldenhofer Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,363,039 Nov. 21, 1944 Surface Grinder with Auxiliary Spindles William G. Baldenhofer Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,378,903 Jun. 26, 1945 Grinding Machine William G. Baldenhofer Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,384,225 Sep. 04, 1945 Method and Apparatus for Maintaining Uniform Temperature of Diverse Fluids in a Machine Tool John C. Wilson Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,384,589 Sep. 11, 1945 Bearing for Rotary Spindles William G. Baldenhofer Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,384,590 Sep. 11, 1945 Lubrication System for Machine Tools William G. Baldenhofer Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,391,375 Dec. 18, 1945 Spindle shaft with intermediate ball bearing John Clifford Wilson Springfield, OH
2,396,147 Mar. 05, 1946 Cooling System for Hydraulically-Operated Machine Tools William G. Baldenhofer Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,398,268 Apr. 09, 1946 Machine Tool John C. Wilson Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,415,324 Feb. 04, 1947 Method of Re-Journaling Spindle Shafts John C. Wilson Springfield, Clark County, OH Original application 11 Nov, 1945. Divided and this application 02 Sept, 1944.

This patent was listed on a Thompson Grinder Co. patent plate.
2,424,347 Jul. 22, 1947 Machine Tool for Cutting Surfaces of Irregular Shape John C. Wilson Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,426,807 Sep. 02, 1947 Apparatus for Shaping Workpieces by Grinding John C. Wilson Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,436,466 Feb. 24, 1948 Method and Apparatus for Grinding and Lapping John C. Wilson Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,438,239 Mar. 23, 1948 Ball Grinding Machine Harry A. Toulmin Jr. Dayton, Montgomery County, OH
2,456,762 Dec. 21, 1948 Apparatus for Crush Dressing Grinding Wheels John C. Wilson Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,457,383 Dec. 28, 1948 Apparatus for grinding Frederick G. Krafft Springfield, OH This patent covers "an improved process and mechanism for the production of thread rolling dies."
2,473,670 Jun. 21, 1949 Grinding Machine John C. Wilson Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,482,302 Sep. 20, 1949 Filtering System Otto M. Summers Glasgow, Barren County, KY
2,495,492 Jan. 24, 1950 Apparatus for Crush Dressing Grinding Wheels John C. Wilson Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,503,646 Apr. 11, 1950 Apparatus for Dressing a Grinding Wheel to a Predetermined Configuration John C. Wilson Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,518,835 Aug. 15, 1950 Filter system Otto Murray Summers Glasgow, KY This coolant/lubricant filtration system is intended for grinders, which produce lots of very small particles.
2,534,941 Dec. 19, 1950 Method and apparatus for grinding William G. Baldenhofer Springfield, OH This machine can grind workpieces with short, deep recesses to be ground.
2,535,183 Dec. 26, 1950 Grinding Wheel Dressing Apparatus John C. Wilson Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,535,184 Dec. 26, 1950 Method and Apparatus for Supplying Coolant to Grinding Wheels John C. Wilson Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,554,079 May. 22, 1951 Method and Apparatus for Continuous Form Grinding John C. Wilson Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,561,004 Jul. 17, 1951 Method and Apparatus for Grinding John C. Wilson Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
    Method and Apparatus for Grinding William G. Baldenhofer Springfield, Clark County, OH  
2,560,654 Jul. 17, 1951 Device for Dressing Grinding Wheels Floryan Lohutko Detroit, Wayne County, MI
2,560,967 Jul. 17, 1951 Apparatus for Grinding Gears and Gear Cutters Floryan Lohutko Detroit, Wayne County, MI
658,306 Oct. 03, 1951 Improvements in and relating to grinding machines and method of shaping grinding wheels John Clifford Wilson Springfield, OH
2,576,201 Nov. 27, 1951 Grinding Method and Machine John C. Wilson Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
663,227 Dec. 19, 1951 Improvements in and relating to a method of and a device for grinding John Clifford Wilson Springfield, OH
2,585,990 Feb. 19, 1952 Method of grinding intricate contours William G. Baldenhofer Springfield, OH
2,586,235 Feb. 19, 1952 Device for Forming Grinding Wheels Frederich G. Krafft Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,586,755 Feb. 19, 1952 Method and Apparatus for Grinding John C. Wilson Springfield, Clark County, OH
2,589,620 Mar. 18, 1952 Apparatus for Cleaning, Dressing, and Grinding Wheels Guy H. Leffel Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,595,591 May. 06, 1952 Apparatus for Grinding Helical Gears Floryan Lohutko Detroit, Wayne County, MI
2,600,746 Jun. 17, 1952 Fluid Pressure Control Valve Walter Ernst Dayton, Montgomery County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,602,436 Jul. 08, 1952 Apparatus for dressing grinding wheels Floryan Lohutko Detroit, MI This apparatus is intended for dressing grinding wheels for final finishing of screw threads.
2,606,571 Aug. 12, 1952 Multipurpose control valve Walter Ernst Dayton, OH
2,612,015 Sep. 30, 1952 Mounting Structure for Grinding Wheels Frederich G. Krafft Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,612,114 Sep. 30, 1952 Vane Pump or Motor Walter Ernst Dayton, Montgomery County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,612,115 Sep. 30, 1952 Vane Pump and Vane Therefor Walter Ernst Dayton, Montgomery County, OH Original application 06 Apr., 1948. Divided and this application 25 Jul., 1949.

This patent was listed on a Thompson Grinder Co. patent plate.
2,623,333 Dec. 30, 1952 Apparatus for Grinding William G. Baldenhofer Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,633,678 Apr. 07, 1953 Machine Tool and Method of Operation Herbert F. Smith Springfield, Clark County, OH This patent was listed on a Thompson Grinder Co. patent plate.
2,636,321 Apr. 28, 1953 Machine tool John Clifford Wilson Springfield, OH This invention "relates to a grinding machine having a rotary table on which is mounted a plurality of fixtures, such as chucks, for supporting workpieces to be machines."
495,289 Aug. 11, 1953 Method of and device for grinding John Clifford Wilson Springfield, OH This invention relates to the steel profile roll that is used to shape and dress the grinding wheel by crushing the two wheels together while slowly rotating in synchrony. The main innovation is a second "master" roll that is used to true up the profile roll, which can be done without having to remove the profile roll from the machine.
495,290 Aug. 11, 1953 Grinding machines and method of shaping grinding wheels John Clifford Wilson Springfield, OH This patent provides a profile roll that is used to shape and dress the grinding wheel by crushing the two wheels together while slowly rotating in synchrony. The main innovation is a method of avoiding any relative motion of the grinding wheel and profile roll.
2,682,748 Jul. 06, 1954 Restrictor Valve for a Servomotor Circuit Walter Ernst Dayton, Montgomery County, OH Original application 06 Apr., 1951. Divided and this application 12 Apr., 1952.

This patent was listed on a Thompson Grinder Co. patent plate.
512,794 May. 10, 1955 Method and apparatus for grinding William G. Baldenhofer Springfield, OH
    Method and apparatus for grinding John Clifford Wilson Springfield, OH  
2,723,505 Nov. 15, 1955 Method and Apparatus for Surface Finishing Frederick G. Krafft Springfield, Clark County, OH
2,730,074 Jan. 10, 1956 Servo-motor valve Walter Ernst Dayton, OH
2,785,511 Mar. 19, 1957 Grinding Machine and Method of Operation John C. Wilson Springfield, Clark County, OH
2,921,439 Jan. 19, 1960 Pump Control Frederick G. Krafft Springfield, Clark County, OH
2,926,653 Mar. 01, 1960 Grinding machines Frederick G. Krafft Springfield, OH
2,932,985 Apr. 19, 1960 Long Piston Rods and Motor Embodying the Same William G. Baldenhofer Springfield, Clark County, OH Original application 08 Feb., 1954. Divided and this application 19 Mar., 1956.
850,425 Oct. 05, 1960 A hydraulic circuit embodying a combined pump and control unit Walter Ernst Dayton, OH
    A hydraulic circuit embodying a combined pump and control unit Frederick G. Krafft Springfield, OH  
2,985,109 May. 23, 1961 Hydraulic Pump Walter Ernst Dayton, Montgomery County, OH
2,986,852 Jun. 06, 1961 Grinding machines John Clifford Wilson Springfield, OH
628,890 Oct. 10, 1961 Pump control Walter Ernst Dayton, OH This invention relates to speed control of a hydraulic motor that keeps its speed constant under varying load. A key design goal was to minimize heating of the hydraulic fluid.
    Pump control Frederick G. Krafft Springfield, OH  
3,011,449 Dec. 05, 1961 Vaned Hydraulic Unit Walter Ernst Dayton, Montgomery County, OH
3,015,212 Jan. 02, 1962 Pump Control Frederick G. Krafft Springfield, Clark County, OH Original application, 26 Jun 1957, now patent #2,921,439. Divided and this application, 31 Dec 1959.
    Pump Control Walter Ernst Dayton, Montgomery County, OH  
3,047,987 Aug. 07, 1962 Apparatus for Submerged Grinding William G. Baldenhofer Springfield, Clark County, OH
    Apparatus for Submerged Grinding Frederick G. Krafft Springfield, Clark County, OH  
913,197 Dec. 19, 1962 Improvements in hydraulic systems Walter Ernst Dayton, OH
    Improvements in hydraulic systems Frederick Krafft Springfield, OH  
656,461 Jan. 22, 1963 Control pump Walter Ernst Dayton, OH This patent has distinct similarities to patent {CA628,890}.
    Control pump Frederick G. Krafft Springfield, OH  
3,083,535 Apr. 02, 1963 Hydraulic servo system Walter Ernst Dayton, OH
    Hydraulic servo system Frederick G. Krafft Springfield, OH  
3,087,286 Apr. 30, 1963 Feeding method and apparatus Frederick G. Krafft Springfield, OH
1,153,585 Aug. 29, 1963 Vorrichtung zur regelung hydraulischer antriebe, insbesondere fuer schleifmaschinen, durch radiale verschiebung eines den rotor der pumpe umgebenden ringes Walter Ernst Dayton, OH
    Vorrichtung zur regelung hydraulischer antriebe, insbesondere fuer schleifmaschinen, durch radiale verschiebung eines den rotor der pumpe umgebenden ringes Frederick G. Krafft Springfield, OH  
3,231,320 Jan. 25, 1966 Hydrostatic Lubrication Frederick Gustave Krafft Springfield, Clark County, OH
3,305,974 Feb. 28, 1967 Grinding Machine John C. Wilson Springfield, Clark County, OH