Register :: Login
Manufacturers Index - Dwight Slate Machine Co.
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
41,646 Feb. 16, 1864 Improved apparatus for grinding cutter-bits for rifling-machines Dwight Slate Hartford, CT
46,152 Jan. 31, 1865 Improvement in turning-lathes Dwight Slate Hartford, CT "My invention relates to that kind of turning-lathe in which the arrangement for turning tapering and curved forms consists in giving to the cutting-tool a motion in and out to and from the axis of the lathe-spindle, in combination with the feed-carriage."
126,160 Apr. 30, 1872 Improvement in tool for grinding lathe-centers Dwight Slate Hartford, CT
146,287 Jan. 06, 1874 Improvement in Milling-Machines Dwight Slate Hartford, CT Lemuel W. Terrell - patent attorney
Milling-tools have heretofore been usually mounted upon an arbor or mandrel at the end of a lathe-mandrel, and the outer end of the arbor of the milling-tool has been supported by a center that is screwed up by the lathe center. In this case, the severe strain to which the milling - tools are subjected is liable to spring the parts, and prevent the milling-tool working true; besides this, the friction causes warmth and expansion in the mandrel that binds the parts in the heads of the lathe. My invention is made for insuring a reliable support to the shaft or mandrel of the milling tool, for allowing the parts to expand under change of temperature, and for easily removing one set of milling-tools and substituting another. I make use of a tubular extension to the mandrel that serves to support such mandrel, and also to clamp the milling-tools upon the arbor or mandrel. This tubular extension is sustained by a journal box or bearing, in which it revolves, and it is free to slide endwise under the varying conditions of temperature, or when being screwed up to clamp the milling tools, or unscrewed for their removal.

243,806 Jul. 05, 1881 Drill-chuck Dwight Slate Hartford, CT
258,236 May. 23, 1882 Pulp-molding machinery George W. Laraway Hartford, CT
    Pulp-molding machinery Dwight Slate Hartford, CT  
326,889 Sep. 22, 1885 Gear-Cutter Dwight Slate Hartford, CT Simonds & Burdett - patent attorneys
I claim as my invention—
In a gear-cutter, in combination, a disk shaped chuck arranged in a horizontal plane and having a central supporting-shaft, and a vertically adjustable supporting-rest arranged beneath the rim of the chuck, substantially as described.
In combination with a rocking bed formed with guide ways and mounted on bearings on the frame and adjustable in a vertical plane on its bearings, and a reciprocating head-piece adapted to move within the guides on said rocking bed, a rotary cutter mounted on bearings in said head-piece and vertically adjustable therein, substantially as described, and for the purpose stated.

347,969 Aug. 24, 1886 Drilling-machine Dwight Slate Hartford, CT A four-spindle example of this drill was seen on eBay.
390,604 Oct. 02, 1888 Lathe-tool Moses C. Johnson Hartford, Hartford County, CT Simonds & Burdett - patent attorneys
The object of my invention is to provide a holder of the class commonly used to hold cutting blades for turning, planing, and the like; and it consists in the combination of a holder or stock having a lateral blade-socket and a plural number of slots that extend beyond each other in the body of the holder, and the blade specially adapted to be held in the blade-socket.

404,773 Jun. 04, 1889 Machine for packaging postal-cards James Rodda Hartford, CT
    Machine for packaging postal-cards Dwight Slate Hartford, CT  
    Machine for packaging postal-cards William H. Bunce Jersey City, NJ  
667,880 Feb. 12, 1901 Metal-working machine Rufus Anderson Hartford, CT E. C. Whitney - patent attorney
This invention relates, generically, to a metal-working machine of that class embodying a chuck or work-holder and a rotative tool-holder or spindle disposed in operative relation with said chuck, and more particulaiiy to improved work centering and holding means for a machine of this class. In metal-working machines of-the class above referred to, in which a chuck is employed for holding the work to be operated upon by a rotating tool, no automatically-operative means have been provided, in so far as we are aware, for first accurately centering a piece of work of irregular contour with relation to the axis of the tool and for subsequently engaging and holding the piece of work in its accurately-centered position that is to say, no independent means have been provided in connection with each jaw of an automatic or universal chucking mechanism whereby the extent of closing movement of each jaw with respect to a center common to all jaws could be arbitrarily varied. One object of the present invention is to provide, in a metal-working machine of the class specified, improved work centering and holding means embodying a plural number of sets or pairs of jaws adapted for engaging a piece of work of irregular contour at different points in the length thereof and to so construct and organize the elementary features of said means that one pair of jaws have predetermined relative movements with respect to a common center and will operate to engage and accurately center the piece of work with respect to the axis of the tool which is to operate thereon, and the other set of jaws will subsequently grasp the piece of work at a different point in the length thereof and hold the same in its accurately-centered position. Another object of the invention is to furnish an improved metal-working machine including a spindle supported for rotative and reciprocatory movements, an independent chuck disposed in advance of said spindle and embodying work-grasping jaws, and means in connection with and operative on reciprocative movements of said spindle for automatically operating said jaws.

    Metal-working machine Howard N. Hinckley Hartford, CT  
772,568 Oct. 18, 1904 Drill-press Howard N. Hinckley Hartford, CT
941,506 Nov. 30, 1909 Change Speed Mechanism Charles B. Elmore Hartford, Hartford County, CT