Dorman Machine Tool Works; John H. Dorman & Son - Assigned Patents

Manufacturers Index - Dorman Machine Tool Works; John H. Dorman & Son

Dorman Machine Tool Works; John H. Dorman & Son
New York, NY; Mount Vernon, NY, 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
943,009	Dec. 14, 1909	Tapping and drilling tool	John H. Dorman	New York, NY	These tapping heads were manufactured for decades. The firm name had become John H. Dorman & Son by 1919, then Dorman Machine Tool Works by about 1948, and by the late '50s the Dorman tapper was being manufactured by Thriftmaster Products Corp. of Lancaster, PA. "In a tapping attachment for drill presses, the combination with a casting containing driving and reversing gears and provided with means for holding it against rotation, of a chuck-spindle having a longitudinal recess, a pivotal retaining pin therein, a transverse clutch-bar loosely held held by the pin in said spindle recess, retaining shoulders on said bar, and oppositely projecting pins upon the driving and reverse gears adapted to be alternately engaged by the bar..."
1,338,682	May. 04, 1920	Jack	John H. Dorman	New York, NY	The inventor was the father in John H. Dorman & Son, which manufactured automobile jacks for several years. See also patent 1,367,307.
1,367,307	Feb. 01, 1921	Jack	Edward A. Dorman	New York, NY	The inventor was the "Son" in John H. Dorman & Son, which manufactured automobile jacks for several years. See also patent 1,338,682.
2,449,284	Sep. 14, 1948	Machine tool adapter	Edward A. Dorman	New Rochelle, NY	This adapter is intended for multi-spindle drill presses where various chucks and other devices must frequently be placed on the spindle. A connector nut is mounted on the spindle and a coupling nut joins with the connector and an adapter with tool carrier. The specific example illustrated is a tapping head. The inventor was the "Son" of tapping- and drilling-head maker John H. Dorman & Son, active 1908 to at least 1922. After that time we cannot find any trace of the company, but then in 1946 we find mentions of the Dorman Machine Tool Works, makers of drilling and tapping heads.