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:
May. 19, 1987
Filed:
Aug. 19, 1985
William T Riley, Woodside, CA (US);
Other;
Abstract
An instant defense barrier for providing unobtrusive protection for a building or other site. A plurality of barrier post assemblies are anchored in the earth. Each assembly includes a barrel and a post slidably fitted in the barrel. The head end of the post portion is essentially flush with the level of the roadbed when the post is in the normal, non-extended position. When activated by closing a switch, the post is propelled from the confined position in the barrel by an explosive charge, a compression spring or other propulsive forces to a locked extended position to provide a barrier against unauthorized passage by a motor vehicle. A plurality of auxiliary cables are optionally connected between adjacent posts to provide further obstruction to the progress of small vehicles, such as motorcycles or bicycles.