Pneumatic Drop Hammer Co. - Assigned Patents

Manufacturers Index - Pneumatic Drop Hammer Co.

Pneumatic Drop Hammer Co.
Boston, MA, U.S.A.
Manufacturer Class: 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
1,722,506	Jul. 30, 1929	Drop hammer	Henning G. Sahlin	Boston, MA
1,924,545	Aug. 29, 1933	Drop hammer	Reginald P. Fitzgerald	Braintree, MA	"Drop hammers are used largely for producing die work which requires such control of the hammer that a proper and accurate blow shall be struck, that no 'shivering' of the hammer shall take place on impact and a secondary blow avoided; otherwise, the pattern work of the die will be destroyed. The present invention comprises certain improvements upon the drop hammer construction disclosed in Patent No. 1,722,506, Henning G. Sahlin, granted July 30, 1929."
		Drop hammer	William H. J. Fitzgerald	Braintree, MA
1,990,478	Feb. 12, 1935	Drop hammer	Reginald P. Fitzgerald	Braintree, MA	A drop hammer "which can be used in buildings above the ground floor thereof without causing vibration to the buildings or floors thereof."
2,206,812	Jul. 02, 1940	Drop hammer die and method of forming same	Reginald P. Fitzgerald	Braintree, MA	William H. J. Fitzgerald was deceased by the time the patent was issued.
		Drop hammer die and method of forming same	William H. J. Fitzgerald	Braintree, MA
2,220,037	Oct. 29, 1940	Double-acting drop hammer	Reginald P. Fitzgerald	Braintree, MA	Improvements to patent 1,990,476.
2,263,680	Nov. 25, 1941	Drop hammer	Reginald P. Fitzgerald	Braintree, MA
		Drop hammer	William H. J. Fitzgerald	Braintree, MA
2,449,647	Sep. 21, 1948	Drop hammer	Reginald P. Fitzgerald	Braintree, MA	Improvements to patent 1,924,545.
2,612,868	Oct. 07, 1952	Pneumatic drop hammer	Reginald P. Fitzgerald	Braintree, MA
2,744,315	May. 08, 1956	Method and apparatus for die-forging articles from blanks of normally rigid material	Reginald P. Fitzgerald	Braintree, MA
2,942,503	Jun. 28, 1960	Power operated hammers	Reginald P. Fitzgerald	Braintree, MA