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:
Feb. 17, 1976
Filed:
Mar. 28, 1974
William L Cotter, Salem, MA (US);
Other;
Abstract
An apparatus that may be used in an automatic drawing system for recording, for example, with pencil lead or ink. In one embodiment using a pencil lead, a push rod connects to a piston which is slideable in a cylinder which has a retaining tube for the lead extending therefrom. Air pressure may be selectively applied to the piston for urging the rod against the lead which is in turn contacting the medium for recording thereon. Retraction of the lead from contact with the medium is performed by a mechanism that moves the cylinder and retaining tube toward the medium after the air pressure has been removed so that the lead slides into the tube, and thereafter moves the cylinder and tube away from the medium to retract the lead from contact with the medium. Detection means are also provided to detect the expending of the lead and a multi-lead holder is indexed so that a new piece of lead is registered with the push rod.