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Manufacturers Index - Pratt & Whitney Co.

Pratt & Whitney Co.
Hartford, CT, U.S.A.
Company Website: http://www.prattandwhitney.com/
Manufacturer Class: Wood Working Machinery & 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
29,939 Sep. 04, 1860 Improvement in devices for stopping and changing motion Francis A. Pratt Hartford, CT Seen on an old Pratt & Whitney milling machine.
33,126 Aug. 20, 1861 Improvement in rotary pumps Monroe Stannard New Britain, CT
33,816 Nov. 26, 1861 Improvement in stopping and changing motion Francis A. Pratt Hartford, CT Seen on an old Pratt & Whitney milling machine.
36,479 Sep. 16, 1862 Tool-rest for turning-lathes Francis A. Pratt Hartford, CT
40,082 Sep. 22, 1863 Improvement in attaching pumps to bungs of barrels Francis A. Pratt Hartford, CT
40,276 Oct. 13, 1863 Improvement in apparatus for attaching pumps to bungs of barrels Francis A. Pratt 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."
60,418 Dec. 11, 1866 Improvement in sewing-machines Francis A. Pratt Hartford, CT Of minor interest because the inventor was co-founder of Pratt & Whitney Co., a machine-tool maker.
RE2,588 Apr. 30, 1867 Improvement in device for stopping and changing motion Francis A. Pratt Hartford, CT Of interest because the inventor was co-founder of machine-tool maker Pratt & Whitney Co., and assignee was also known as Phoenix Iron Works, which made drill presses.
89,177 Apr. 20, 1869 Planing Metals Dwight Slate Hartford, Hartford County, CT The nature of this invention will be understood from the specification and drawings, the object of which is to simplify and make more direct the action of the whole mechanism of the shipping-apparatus of a planer. It has heretofore been the most difficult part to arrange in a planer, involving many joints, rods, &c. By this arrangement, many parts heretofore used, are dispensed with, by substituting a rock-shaft, or a rolling, or oscillating cam, secured upon a rock-shaft, which carries or actuates the shipper-rod, thereby-rendering it more simple, efficient, and durable.
D3,611 Aug. 10, 1869 Design for an upright drill Francis A. Pratt Hartford, CT
93,903 Aug. 17, 1869 Metal Planing Francis A. Pratt Hartfotd, CT
100,064 Feb. 22, 1870 Improvement in friction-clutches Francis A. Pratt Hartford, CT
102,577 May. 03, 1870 Metal Chuck Augustus Newell Chicago, Cook County, IL Munn & Co.- patent attorneys
    Metal Chuck William Pim Chicago, Cook County, IL  
D4,439 Oct. 25, 1870 Design for a drilling-machine Francis A. Pratt Hartford, CT
112,379 Mar. 07, 1871 Improvement in machines for shaping and cutting gear-cutters Francis A. Pratt Hartford, CT
118,481 Aug. 29, 1871 Improvements in Machinery for Feeding Wire to Machines Edward G. Parkhurst Hartford, Hartford County, CT This patent was improved upon by patent #714,895.
148,566 Mar. 17, 1874 Griping and Cutting Tools De Lancy Kennedy New York, NY Compound leverage applied to nippers, shears, punches, etc.
A known application of the principle was a metal cutting shears.
161,968 Apr. 13, 1875 Metal Punch De Lancy Kennedy New York, NY
164,391 Jun. 15, 1875 Improvement in metal-shearing machines Francis A. Pratt Hartford, CT Seen on an old Pratt & Whitney milling machine.
164,392 Jun. 15, 1875 Improvement in drop-hammers Francis A. Pratt Hartford, CT Seen on an old Pratt & Whitney milling machine.
165,519 Jul. 13, 1875 Protractor Ambrose Swasey Hartford, CT Swasey's Bevel Protractor.
he accompanying illustration represents a new instrument intended for the use of draughtsmen, machinists and surveyors. It was invented by Ambrose Swasey, at the shops of the Pratt & Whitney Co., of Hart ford, Conn. First, we have a plain steel square, one-eighth of an inch thick, the two sides of which are each five inches in length. A swinging rule, or blade A, is attached to the square by means of a circular piece B, which moves in a dove-tailed slot, and may be set to move tight or loose by means of two screws and the binder C, depending upon the friction to hold it. The edge of the slot is marked with the different degrees, from zero up to 90°. In the illustration, each mark on the arc represents 5°, while in the regular instrument each of these degrees is marked. Both sides of the protractor presents a level face, so that it may lie flat upon the paper, and be used equally well on either side. The protractors in general use have a thumb-screw (to hold the blade), which projects from one side, in consequence of which only one side can be used.
The Swasey instrument is so arranged that any angle may be measured or drawn, whether acute or obtuse. Should the draughtsman wish to draw a line at an angle of 65° from his T square, set the zero mark on the sliding arc to that number, as indicated by the graduations, and placing the base of the square forming that angle with the swinging rule against the T square; then draw the desired angle. By simply turning the instrument one-quarter turn, round towards the right, so as to bring the other base of the square against the T square, will give an angle of 155°. If the instrument be now lifted by the right-hand corner and turned over towards the left (upside down), the angle formed will be 25°
Again, if the instrument be placed in the first position, as shown in drawing, the angle being 65°, taking hold of the left-hand corner and turning it over (upside down), will give an opposite angle of 115°. From the foregoing illustrations, the reader will understand that after drawing an angle of 60°, by turning the instrument over the same angle may be drawn but pointing in the opposite direction. The advantages of these problems may be readily understood by draughtsmen, as by simply turning the instrument, any angle, or its complement, may be drawn at once. This instrument is particularly adapted to the measurement of angles drawn upon paper or any other plane surface, as the swinging rule being the same thickness as the square, the edges of both lie even upon the paper, thus the protractor can be more accurately adjusted to the lines than if one edge were raised above the surface, as is the case with most protractors.
Another practical advantage in having both sides of the protractor even is, when the angles of solid bodies are to be measured, as in the case of crystals, pieces of machinery, etc., there is no difficulty in holding it firmly and squarely upon the piece to be measured, at the same time forming the angle between the swinging rule and body of the tool, open to the apex. The cross-section lines of complicated parts of machinery, where a number of angles are required to bring out the different parts distinctly, may be readily drawn by adjusting the swinging rule.
American Machinist, 24 Jan 1880, pg. 7
168,412 Oct. 05, 1875 Improvement in cranes Francis A. Pratt Hartford, CT Seen on an old Pratt & Whitney milling machine.
172,854 Feb. 01, 1876 Wrench John J. Grant Hartford, CT The gripping jaws are actuated by ratchet action. The inside of the ratchet wheel has "tapered" flanges which engage slots in the gripping jaws, to close or open them. A spring-loaded pawl on one side provides the ratchet action.
189,057 Apr. 03, 1877 Improvement in machines for varnishing the interior of cartridge-shells Francis A. Pratt Hartford, CT
    Improvement in machines for varnishing the interior of cartridge-shells John R. Reynolds Hartford, CT  
241,236 May. 10, 1881 Adjustable lever Francis A. Pratt Hartford, CT Seen on an old Pratt & Whitney milling machine.
241,563 May. 17, 1881 Metal-planing machine Francis A. Pratt Hartford, CT Seen on an old Pratt & Whitney milling machine.
248,587 Oct. 25, 1881 Device for Throwing Belts Onto or Off From Revolving Pulleys William Gray Hartford, Hartford County, CT
256,165 Apr. 11, 1882 Machine for Cutting Grooves in Rolls John R. Reynolds Hartford, CT
275,431 Apr. 10, 1883 Metal Screw Machine Christopher M. Spencer Hartford, Hartford County, CT The Pratt & Whitney Co. made these machines for the Hartford Screw Machine Co.
319,618 Jun. 09, 1885 Frame and carriage for machines Francis A. Pratt Hartford, CT Seen on an old Pratt & Whitney milling machine.
323,202 Jul. 28, 1885 Milling-machine Francis A. Pratt Hartford, CT Seen on an old Pratt & Whitney milling machine.
323,208 Jul. 28, 1885 Planer Table Driving Mechanism Francis H. Richards Springfield, MA
331,046 Nov. 24, 1885 Slide Rest James Fitzgerald Providence, RI
331,443 Dec. 01, 1885 Blank-feeding mechanism Francis H. Richards Springfield, MA The "blanks" in questions are pieces of paper to be fed into an envelope-making machine.
349,840 Sep. 28, 1886 Drafting Compass Frederick N. Gardner Hartford, CT
365,744 Jun. 28, 1887 Drilling-machine John Worth Heyer Hartford, CT
366,187 Jul. 05, 1887 Shearing mechanism Francis H. Richards Springfield, MA
376,838 Jan. 24, 1888 Drilling Machine Amos Whitney Hartford, Hartford County, CT This patent was improved on by patent #390,108.
385,543 Jul. 03, 1888 Tap with Detachable Cutters Albert Burritt Waterbury, New Haven County, CT
390,190 Sep. 25, 1888 Turret-lock Francis H. Richards Hartford, CT
390,108 Sep. 25, 1888 Center Drilling Machine Amos Whitney Hartford, Hartford County, CT This patent was an improvement on patent #376,838.
403,988 May. 28, 1889 Automatic Grain Scales Charles H. Cooley Hartford, CT F. H. Richards - patent attorney
My improved, machine comprises as principal elements thereof a scale-beam, a double chambered oscillating bucket suspended from one end of said beam, a counterpoise or weight supported from or on the opposite end of said beam, a supplemental weight, a discharging hopper above said bucket, a movable receiving-hopper below said bucket, a pair of cutoff valves and devices actuating the same from the scale-beam, and a regulator-valve operatively connected with the movable receiving-hopper. Not all of these elements, however, are necessarily employed in a single machine.

421,556 Feb. 18, 1890 Automatic regulator for grain-scales Charles H. Cooley Hartford, CT A companion patent to 403,988.
421,773 Feb. 18, 1890 Screw Cutting Die Thomas L. Smith Milwaukee, WI Original Application filed on 30 Aug 1877.
F. H. Richards - patent attorney
434,702 Aug. 19, 1890 Grain-weigher Francis H. Richards Hartford, CT
    Grain-weigher Charles H. Cooley Hartford, CT  
434,723 Aug. 19, 1890 Regulator for Grain Weighers Francis H. Richards Hartford, Hartford County, CT
440,740 Nov. 18, 1890 Scale-beam for grain-weighers Francis H. Richards Hartford, CT
    Scale-beam for grain-weighers Charles H. Cooley Hartford, CT  
442,640 Dec. 16, 1890 Regulator for grain-scales Francis H. Richards Hartford, CT
442,711 Dec. 16, 1890 Regulator for grain-scales Francis H. Richards Hartford, CT
442,712 Dec. 16, 1890 Grain-weigher Francis H. Richards Hartford, CT
442,713 Dec. 16, 1890 Grain-weigher Francis H. Richards Hartford, CT
442,714 Dec. 16, 1890 Grain-weigher Francis H. Richards Hartford, CT
442,715 Dec. 16, 1890 Regulator grain-weigher Francis H. Richards Hartford, CT
442,716 Dec. 16, 1890 Regulator grain-weigher Francis H. Richards Hartford, CT
442,717 Dec. 16, 1890 Grain-weigher Francis H. Richards Hartford, CT
442,718 Dec. 16, 1890 Grain-meter Francis H. Richards Hartford, CT
442,719 Dec. 16, 1890 Grain-weigher Francis H. Richards Hartford, CT
442,720 Dec. 16, 1890 Grain-weigher Francis H. Richards Hartford, CT
442,722 Dec. 16, 1890 Grain-weigher Charles H. Cooley Hartford, CT
442,723 Dec. 16, 1890 Grain-weigher Charles H. Cooley Hartford, CT
442,859 Dec. 16, 1890 Grain-weigher Francis H. Richards Hartford, CT
    Grain-weigher Charles H. Cooley Hartford, CT  
442,860 Dec. 16, 1890 Grain-weigher Francis H. Richards Hartford, CT
    Grain-weigher Charles H. Cooley Hartford, CT  
442,861 Dec. 16, 1890 Grain-weigher Francis H. Richards Hartford, CT
    Grain-weigher Charles H. Cooley Hartford, CT  
443,569 Dec. 30, 1890 Grain-weigher Charles H. Cooley Hartford, CT
443,718 Dec. 30, 1890 Grain-weigher Francis H. Richards Hartford, CT
443,933 Dec. 30, 1890 Grain-weigher Francis H. Richards Hartford, CT
    Grain-weigher Charles H. Cooley Hartford, CT  
448,525 Mar. 17, 1891 Punching Machine De Lancy Kennedy New York, NY
504,172 Aug. 29, 1893 Roll Grooving Machine Francis A. Pratt Hartford, CT
    Roll Grooving Machine John Johnson Hartford, CT  
506,620 Oct. 10, 1893 Milling Machine Edgar W. Bemis Worcester, Worcester County, MA
515,292 Feb. 20, 1894 Tap Wrench Albert H. Kent Hartford, CT
531,203 Dec. 18, 1894 Lathe for Turning Elliptical Forms Charles W. MacCord Hoboken, Hudson County, NJ
533,978 Feb. 12, 1895 Milling-machine John Johnston Hartford, CT Co-inventor Whitney was co-founder of the Pratt & Whitney Co. This invention is a machine for making bicycle sprocket-wheels. Co-inventor Johnston was a machine designer Pratt & Whitney. In 1893 Johnston left to co-found the Potter & Johnson Machine Co.
    Milling-machine Amos Whitney Hartford, CT  
534,220 Feb. 12, 1895 Milling Tool Arthur H. Kent, deceased (Estate of) Hartford, CT Simonds, Burdett & Frothingham - patent attorneys
The object of my invention is to provide what is known in the shops as an inserted tooth mill with means for securely clamping the removable teeth in the body part of the cutter, and to this end my invention consists of the details of the several parts making up the cutter body and the tooth holding clamp.

    Milling Tool Edgar D. Clark, Administrator of the Estate Hartford, CT  
560,171 May. 12, 1896 Multiple drill August J. Oehring Chicago, IL This was apparently a fairly important patent because the drill spindles were both universally (i.e., simultaneously) and individually adjustable. No previous drill had provided this combination of adjustability, where all adjustments could be made in all directions.
The patent specification says "Assignor of one-third to the Pratt & Cady Company, of Hartford, Connecticut." A lawsuit involving this patent indicates that the assignee was the Pratt & Whitney Company. The lawsuit was against Wm. Gardam & Son of New York. The lawsuit originally resulted in a finding largely against the complainant, Pratt & Whitney, but the decision was reversed on appeal.
D25,719 Jun. 30, 1896 Design for a Gage Oberlin Smith Bridgeton, NJ Elliptical body wire gage with a patent term of 14 years. Known example is marked: DECIMAL GAGE/MASTER MECHANICS as well as THE PRATT & WHITNEY CO./HARTFORD, CONN/U.S.A. and STANDARD/Patented June 30, 1896
588,056 Aug. 10, 1897 Screw Cutting Tool Frank G. Echols Hartford, CT Five flute cutter instead of the standard four flute cutter and addition gaps between the cutting teeth to facilitate lubricant and chip movement. Applicable to both taps and dies. Known example marked: P&W CO
608,854 Aug. 09, 1898 Ball-bearing Carl L. Grohmann Hartford, CT See patent 612,412 for more on co-inventor Carl L. Grohmann.
    Ball-bearing Lewis E. Harper Hartford, CT  
627,299 Jun. 20, 1899 Metal-working machine Frank G. Echols Hartford, CT The machine in this patent was designed to manufacture the tap of patent 588,056 and constitutes a different approach from his earlier tap-making machine of patent 602,062.
627,529 Jun. 27, 1899 Screw Machine George E. Randles Hartford, Hartford County, CT
659,962 Oct. 16, 1900 Turret-tool Clarence L. Goodrich Hartford, CT
666,695 Jan. 29, 1901 Ratchet Drill Joseph B. Renshaw Hartford, Hartford County, CT
688,515 Dec. 10, 1901 Metal Working Machine Bengt M. W. Hanson Hartford, Hartford County, CT
714,894 Dec. 02, 1902 Relieving Attachment for Lathes Bengt M. W. Hanson Hartford, Hartford County, CT
714,895 Dec. 02, 1902 Clutch Operating and Feeding Device Bengt M. W. Hanson Hartford, Hartford County, CT This patent was an improvement upon patent #118,481.
726,678 Apr. 28, 1903 Lathe Bengt M. W. Hanson Hartford, CT Mechanism for stopping and reversing the lathe carriage.
731,870 Jun. 23, 1903 Indexing Mechanism Francis G. Echols Hartford, CT
732,184 Jun. 30, 1903 Dimensioning apparatus Bengt M. W. Hanson Hartford, CT
750,108 Jan. 19, 1904 Tool-holder Bengt M. W. Hanson Hartford, CT
795,222 Jul. 18, 1905 Gearing for lathes Bengt M. W. Hanson Hartford, CT This quick-change gearbox mechanism was used for years on Pratt & Whitney lathes. The pinion-gear is carried on a lever that can slide side-to-side to align with the chosen cone gear, and then rocks forward to engage both the cone gear and the driving gear. This basic design was not new but many design details were covered by this patent, most of these refinements intended to strengthen and stiffen the mechanism.
847,573 Mar. 19, 1907 Chuck Bengt M. W. Hanson Hartford, CT
876,543 Jan. 14, 1908 Friction Clutch Bengt M. W. Hanson Hartford, Hartford County, CT
921,985 May. 18, 1909 Mechanism for shifting the cross-slides of lathes Bengt M. W. Hanson Hartford, CT
945,387 Jan. 04, 1910 Metal-working machine Bengt M. W. Hanson Hartford, CT
945,453 Jan. 04, 1910 Mechanism for actuating cross-slides Bengt M. W. Hanson Hartford, CT
945,455 Jan. 04, 1910 Reducing-machine Bengt M. W. Hanson Hartford, CT
945,456 Jan. 04, 1910 Metal-working machine Bengt M. W. Hanson Hartford, CT
984,809 Feb. 21, 1911 Chuck Clarence L. Goodrich Hartford, CT
1,063,160 May. 27, 1913 Forming Machine Bengt M. W. Hanson Hartford, CT
1,076,242 Oct. 21, 1913 Radial drill Willard T. Sears Hamilton, OH
1,089,442 Mar. 10, 1914 Radial drill Willard Thomas Sears Hartford, CT
1,122,649 Dec. 29, 1914 Adjusting mechanism Willard Thomas Sears Brooklyn, NY
1,182,170 May. 09, 1916 Head-stock Bengt M. W. Hanson Hartford, CT
1,182,477 May. 09, 1916 Boring-machine Carl L. Grohmann Hartford, CT See patent 612,412 for more on co-inventor Carl L. Grohmann.
    Boring-machine Bengt M. W. Hanson Hartford, CT  
1,187,730 Jun. 20, 1916 Milling-machine Bengt M. W. Hanson Hartford, CT
1,187,920 Jun. 20, 1916 Chuck Friederich Müller Hartford, CT
1,191,220 Jul. 18, 1916 Automatic back-rest Gustaf E. Peterson Hartford, CT
1,194,864 Aug. 15, 1916 Metal-working machine Friederich Müller Hartford, CT
1,199,408 Sep. 26, 1916 Chucking device Friederich Müller Hartford, CT
1,202,997 Oct. 31, 1916 Tail-stock Bengt M. W. Hanson Hartford, CT
1,211,840 Jan. 09, 1917 Metal-working machine Bengt M. W. Hanson Hartford, CT
RE14,299 May. 08, 1917 Automatic back-rest Gustaf E. Peterson Hartford, CT
1,233,994 Jul. 17, 1917 Machine for taper-forming Richard F. Dow Hartford, CT
1,237,511 Aug. 21, 1917 Lathe Bengt M. W. Hanson Hartford, CT Improved mechanism for stopping and reversing the lathe carriage.
1,252,928 Jan. 08, 1918 Lathe Friederich Mueller Hartford, CT
1,273,904 Jul. 30, 1918 Tap Making Machine Friederich Müller Hartford, CT J. H. Freeman - patent attorney
patent renewed 23 Oct, 1917
1,282,819 Oct. 29, 1918 Stop Mechanism for Lathes Bengt M. W. Hanson Hartford, CT Keith Sutherlind - patent attorney
Application renewed 31 Jul. 1918.
1,287,732 Dec. 17, 1918 Machine for Milling Knurls Friederich Müller Hartford, CT The invention relates to a milling machine primarily, intended and adapted for the cutting of spiral grooves in cylindrical blanks to form knurls. It will be understood, however, that while the machine is especially adapted for forming knurls, it may by suitable modifications, be adapted for other uses, and it will further be understood that several of the parts of the machine may be used separately from other parts and may be embodied in machines quite different in construction and operation. One of the objects of the invention is to provide a knurl milling or equivalent machine having two or more spindles upon which knurl blanks may be carried to be simultaneously milled. Another object of the invention is to provide improved means whereby all of the spindles may be simultaneously and uniformly indexed. A further object of the invention is to provide improved means whereby the knurl blanks and the milling cutters are separated from each other on the return movement. Another object of the invention is to provide improved means whereby right or left spiral grooves may be formed as required. Another object of the invention is to provide means for stopping the operation of the machine after a blank has been completely milled. Still another object of the invention is to provide an improved indexing mechanism. Additional objects of the invention will be apparent from the following specification and claims. In the accompanying drawings I have shown the embodiment of the invention which I now deem preferable, but it will be understood that the invention can be embodied in other ways and that the drawings are intended to be merely illustrative and are not intended to define or limit the scope of the invention.

1,287,731 Dec. 17, 1918 Automatic Grinding Machine Friederich Müller Hartford, CT
1,299,208 Apr. 01, 1919 Relieving Lathe Friederich Müller Hartford, CT
1,323,267 Dec. 02, 1919 Precision Boring Machine Bengt M.W. Hanson Hartford, CT S. J. Teller - patent attorney
1,323,268 Dec. 02, 1919 Lubricating System Bengt M. W. Hanson Hartford, CT S. J. Teller - patent attorney
Patent renewed 30 Jun 1919.
1,323,276 Dec. 02, 1919 Metal Working Machine and Method Frank O. Hoagland Hartford, CT Heath Sutherland - patent attorney
1,323,277 Dec. 02, 1919 Metal Working machine Frank Hoagland Hartford, CT Heath Sutherland - patent attorney
This invention relates to a machine which is similar in many respects to that set forth in my contemporaneously pending application filed April 5, 1917, Serial No. 159,883 (patent # 1,323,276. The present machine like that in said other application can be utilized in widely different arts, although it is of especial advantage in the production of bullets such for instance as are used in small arms. The present machine, like that in the aforesaid application, comprises mechanism for supporting a blank and for supplying to the blank one or. a succession of blows upon its surface. In the earlier application before referred to, I have shown a machine having two rotatable rollers for applying a plurality of blows in rapid succession to the surface of the blank, these blows being delivered by means of ribs formed on the surface of two rapidly rotating rollers arranged side by side. In the present case I make use of an outer annular roller and an inner roller which is surrounded by the outer roller and which is arranged eccentrically with respect thereto. The bullet blank is engaged and acted upon by the surfaces of the two rollers at the throat where the surfaces are close together.
1,392,313 Oct. 04, 1921 Screw Thread Gage Galvin S. Fallow Wethersfield, CT S. J. Teller - patent attorney
1,480,611 Jan. 15, 1924 Measuring Machine Reuben Hill Hartford, CT S. J. Teller - patent attorney
1,507,272 Sep. 02, 1924 Internal Expansion Gauge Earle Buckingham Hartford, CT S. J. Teller - patent attorney
1,513,758 Nov. 04, 1924 Shaper for Grinding Wheels Bengt M. W. Hanson Hartford, Hartford County, CT
1,535,267 Apr. 28, 1925 Spindle-stop mechanism John J. Thacher Wethersfield, CT
1,547,514 Jul. 28, 1925 Thread Testing Device Paul M. Mueller Hartford, CT Joseph K. Schofield - patent attorney
This invention relates to a thread testing device, and in particular to a device for rapidly determining the accuracy of a number of similar screw threaded members. An object of the present invention is to provide a screw thread testing device which may be adjusted over a wide range of sizes and adapted to quickly compare the accuracy’s of a number of screw threads with a standard screw thread of the same nominal size. Another object of the invention is to provide a device which by substitution of different forms and sizes of screw thread contacting members and by adjustment of the positions of the screw thread contacting members may be used for comparing the dimensions of a number of different types and sizes of screw threads within a wide range. One feature which enables me to accomplish the above objects is that I provide a pair of oppositely disposed screw thread gaging or contacting members having serrated edges corresponding in outline to the particular form of screw threads being examined and, by permitting different sets of contacting members to be readily and quickly substituted, any number of different forms of screw threads may be tested. Another feature which is advantageous is that one of the screw thread contacting members is so mounted that it is adjustable over a wide range to accommodate screw threaded members of varying diameters and the oppositely disposed contacting member is flexibly or resiliently mounted so that it may have a limited movement toward or from the first contacting member. Means are also provided whereby the position of the flexibly mounted contacting member may be determined to a high degree of precision when in screw thread engaging position, so Another object of the invention is to provide contacting members adapted to engage but one thread on either side of the specimen being tested so that the inaccuracy in diameter can be determined independently of any error in the lead or pitch of the screw threads. By the use of both forms of gaging or contacting members upon a specimen and a standard, the error, if any, in lead or pitch can be approximately calculated. It is also an object of the invention to arrange the contacting members and to support the member being tested in such a way that light may be reflected and transmitted through the base of the device so that the contact between the contacting members and cs the screw threaded body may be visually examined, and errors of pitch and angle of sides of the screw threaded body being tested may be readily ascertained. A further object of the invention is to provide a suitable adjustable support for the specimen being tested permitting the specimen to be rapidly placed in operative position relative to the contacting or gaging members. It is also an object of the invention to provide a support suitable not only for plain screw threaded members but for such members as taps in which the gaging members must contact at points on the screw threaded portions near the cutting edges.
1,549,635 Aug. 11, 1925 Thread Gauge Paul F. Vokal Hartford, CT This invention relates to gauges and particularly to a thread gauge for measuring the pitch diameter of threading taps. Such a tap ordinarily comprises a plurality of spaced thread cutting lands there around, as shown in the accompanying drawing. It is of course essential that the pitch diameter of these taps shall be accurate within certain
limits and it is the primary object of this invention to provide a gauge particularly adapted to measure such diameter.
It is a further object of the invention to provide a U-shaped gauge having a pair of anvils on one arm thereof for engaging the threads on two adjacent lands of a tap and a cooperating micrometer-operated thread engaging element on the other arm for engaging the threads on a land opposite the said two adjacent lands, the said anvils and their supporting element preferably being loosely mounted whereby to freely adjust themselves to the threads being gauged.

1,582,669 Apr. 27, 1926 Screw Thread Cutting Means for Bench Lathes Henry E. Durkee Glastonbury, Hartford County, CT
1,851,283 Mar. 29, 1932 Gauge Charles G. Johnson Hartford, CT Arthur B. Jenkins - patent attorney
1,961,605 Jun. 05, 1934 Standard Spindle Nose Alfred E. Drissner Cleveland, Cuyahoga County, OH
    Standard Spindle Nose Frank O. Hoagland West Hartford, Hartford County, CT  
    Standard Spindle Nose Max E. Lange Cleveland Heights, Cuyahoga County, OH  
    Standard Spindle Nose Nils Ivar Lundberg Madison, Dane County, WI  
    Standard Spindle Nose John E. Lovely Springfield, Windsor County, VT  
1,980,336 Nov. 13, 1934 Chuck Retaining Means Frank O. Hoagland West Hartford, Hartford County, CT
2,101,177 Dec. 07, 1937 Bench Type Machine Tool Frank O. Hoagland West Hartford, Hartford County, CT
2,440,916 May. 04, 1948 Precision Measuring and Postioning Device John M. Rusnak West Hartford,Hartford County, CT This patent is listed on a Pratt & Whitney 2E Jig Borer.
    Precision Measuring and Postioning Device James W. Durkee Manchester, Hartford County, CT  
3,241,356 Mar. 22, 1966 Gage Plug William J. Blaiklock Collinsville, CT Rockwell & DeLio - patent attorneys