Thompson Grinder Co. - Assigned Patents

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.

Submitting Patent Information

If you find a patent number or patent date by this manufacturer that is not on this list, please contact the Site Historian.

Key to Links for Patent Information

USPTO = U.S. Patent Office . Images of the actual patent can be viewed on the U.S. Patent Office web site but a special TIFF viewer must be installed with your browser in order properly work. More information on how to configure your computer to view these patents can be found at TIFF image Viewers for Patent Images.
DATAMP = Directory of American Tool And Machinery Patents . A sister site to VintageMachinery.org with information on patents related to machinery and tools. A much easier user interface than the USPTO's for finding information on machinery patents.

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, and also on a Brown & Sharpe patent plate. Abstract: This invention relates to improvements in grinding machines of the class known as surface grinding machines, and more particularly to that class in which the work-holder and tool-holder are reciprocally operated by fluid motors, the fluid preferably being a mineral oil under pressure. In machines of this class the work-holder is reciprocated by means of a fluid motor consisting of a cylinder, piston and piston rod. The toolhead is usually advanced or retracted in successive intermittent movements of varying extent by a similar motor, the intermittent movements being timed to occur at the ends of the working strokes of the work-holder. The grinding operation is performed on the work supported on the work-holder by peripheral contact of a rotatable grinding wheel, which is mounted on the outer end of a wheel spindle supported in a horizontally disposed toolhead in such manner that the longitudinal axis of the spindle is located at right-angles to the direction of travel of the work- holder, whereby a flat surface is produced on the work by feeding the wheel across the work in successively intermittent movements. The machine described in the present specification follows a customary practice in providing reversing mechanism which is operated by stop- dogs adjustably secured to the work-holder, this mechanism governing the reversals of the work- holder, and also by the provision whereby the fluid under pressure is supplied to the separate fluid motors from a common source. In the present machine the intermittent feed imparted to the toolholder is obtained by supplying successive predetermined quantities of fluid to the same end of the cylinder of the toolholder motor, and both the toolholder motor and the work-holder motor are supplied from the same source of fluid under pressure. One of the disadvantages of such an arrangement has been that due to varying fluid pressures when the speed of the work-holder is changed, successive charges of fluid of a different quantity will be 1admitted to the toolholder motor resulting in a change in the extent of the intermittent feeds of the toolholder. If the speed of the work-holder motor is decreased, the successive intermittent movements of the toolholder become greater, and 5if the speed of the work-holder motor is increased the extent of the successive feeds of the toolholder is reduced. As a consequence of this, unless provision is made otherwise for preventing it, the quantity of the successive fluid charges admitted to the toolholder motor will obviously vary at different speeds of the work-holder resulting in a variation in the feed of the toolholder. One of the objects of this invention is to overcome this objection by providing that uniform successive charges of fluid will be admitted to the toolholder motor regardless of the speed of the work-holder. Another object of the invention is the provision of means incorporated in a unitary hydraulic valve control mechanism, whereby a smoothly operating machine is afforded. One of the advantages of fluid motor drive is that infinite gradation of work-holder speeds is readily obtainable. Ordinarily, however, the operation is hampered by vibration due to shock at work-holder reversals. The present invention provides a cushioning effect whereby all shock is eliminated. Another object is the provision of improved means for controlling the extent of each intermittent movement of the tool-head, which means may also be employed to alter the direction of movement of the toolholder. Another object is to provide means acting in combination with the devices just mentioned which control the toolhead movements whereby a continuous movement may be given the toolhead in either direction, the direction being under the control of the intermittent control means. Another object is to provide that the toolhead is maintained in position during the intervals between times of movement; that is, the toolhead is substantially in a "locked" position. Claim: In a machine of the character described, a plurality of fluid motors operating from the same source of fluid supply, manual means for regulating the fluid supplied to one of said motors, and fluid admission means operated directly by fluid for admitting successive predetermined charges of the fluid to another of said motors also operable from the same source of fluid supply.
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.
2,131,151	Sep. 27, 1938	Grinding machines	Herbert F. Smith	Springfield, OH	This patent number was seen on a surface grinder from Thompson Grinder Co.
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