The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 09, 1983
Filed:
May. 12, 1981
Katsuaki Kosaka, Tokyo, JP;
Kazunori Kawasaki, Kawagoe, JP;
Nissan Motor Company, Limited, Yokohama, JP;
Abstract
A solid propellant rocket motor devised so as to temporarily increase its thrust at a desired stage of its operation. The motor has a first propellant grain which is fixedly disposed in the combustion chamber and is formed with a hole that intersects an inital burning surface of the grain and a second propellant grain which is slidably and gastightly fitted in the hole of the first grain and is shorter in length than this hole. Initially, the second grain is prevented from moving relative to the first grain by a restraining mechanism including, for example, a plunger protruding into an aft end portion of the aforementioned hole to come into abutment with an end face of the second grain. At a desired moment during operation of the motor, the restraining mechanism can be rendered ineffective by actuating a releasing device, whereby the second grain is forced to move by the combustion gas pressure with the result that an end portion of the inner surface of the first grain defining the hole is exposed and becomes an additional burning surface. Usually the two grains are so shaped and arranged as to constitute a fundamentally end-burning grain.