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Manufacturers Index - Hartford Special Machinery Co.

Hartford Special Machinery Co.
Hartford, CT, U.S.A.
Manufacturer Class: Metal Working Machinery

This page contains information on patents issued to this manufacturer.

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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.
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Patent Number Date Title Name City Description
1,370,598 Mar. 08, 1921 Chuck Donald H. Lapointe Hartford, Hartford County, CT
2,144,486 Jan. 17, 1939 Locating Device Edmund M. Erb West Hartford, Hartford County, CT Also patented in Great Britain, patent #501631.
501,631 Mar. 02, 1939 Improvements in Indexing Devices for Chucks and Other Work Holders Edmund M. Erb West Hartford, Hartford County, CT See U. S. Patent #2,144,486.


A work holder 31 is secured to a member 27 for rotation in abase 11 located in a machine by keys 18. An indexing disc 45, with evenly spaced peripheral slots, is secured to the member 27 by studs 44 and is locked by a slide 50 mounted in the base and engaging the slots A masking disc 73 with peripheral slots arranged for a particular sequence of operations is secured to the disc 45 by a pin 74 and cover plate 80 with slots of both discs in register. The slide 50 co-operates with both discs and locks the work holder' when the slots of disc 45 are unmasked by the slots of disc 73. The work holder is locked by a two-part brake 91.
2,779,220 Jan. 29, 1957 Universal Drilling Machine Raymond J. Dunn Jr. West Hartford, Hartford County, CT
    Universal Drilling Machine Oscar L. Wright Jr. Grandby, Hartford County, CT