Abstract: Easily removable instrument pen tip comprised of a body formed of resilient plastic with an ink passageway adapted to receive and sealingly engage an ink supply tube associated with a pen arm, the other end of which is adapted to receive and sealingly engage an elongated nib element, such as a stylus or fibrous nib. The pen tip body is a flat shaped member in which the passageway lies. The body may converge toward the ink passageway to serve as a visually indicating pointer. The body may also include locators or positioning ribs and reinforcing ribs. Preferably, the body and passageway include bent sections and the nib element and passageway are adapted for engagement only in the bent section passageway.

Abstract: Disposable instrument pen with integrally-formed spring member simplifies installation and provides its own biasing means for urging the pen nib into engagement with a writing surface and/or for retaining the pen in a pen mounting carriage. In various alternative embodiments, the spring member may consist of a cantilever arm, a torsion bar with end mount fixtures, a helical spring, flared wings, etc.

Abstract: Disposable instrument pen with integrally-formed spring member simplifies installation and provides its own biasing means for urging the pen nib into engagement with a writing surface and/or for retaining the pen in a pen mounting carriage. In various alternative embodiments, the spring member may consist of a cantilever arm, a torsion bar with end mount fixtures, a helical spring, flared wings, etc.

Abstract: Novel apparatus for mounting a pen to a tubular recorder pen arm includes an elongated resilient clip with two apertures formed therein that are axially alignable with each other. Fastening and positioning means, such as pronged projections, located on the clip, securely position the desired pen on the clip. The recorder pen arm is inserted through the clip apertures, upon alignment thereof against the resilient urging of the clip, so that the pen is accordingly mounted to the recorder pen arm.

Abstract: Convenient disposable marker design facilitates manufacture of disposable markers at low cost within a wide range of configurations and writing capacities. Marker comprises tubular, plastic-sheathed fibrous ink reservoir material cut to predetermined length for a particular marker and capped at one end. At the opposite end, a tip cap with nib projection is sealingly mounted on the plastic sheathed reservoir material.In another form of the invention, the tubular outer body fits snugly over a tip cap projection and is sealed by an external sealing rib to flushly mate with the tip cap body. A metallic holder clip fastens the disposable marker securely to the recorder pen arm.

Abstract: A hydraulic power circuit for operating hydraulic motors at several speeds includes first and second fluid sources and a valve assembly for combining flow from the second source with flow from the first source as a faster motor speed is required. The valve assembly includes a first valve controlling the flow of fluid from the first source to the motors while a slow motor speed is required. The valve assembly also includes a fluid actuated valve controlling the flow of fluid from the second source to the motors as a faster motor speed is required. The fluid actuated valve is actuated by flow from the first source through metering ducts. Once the fluid actuated valve is actuated, fluid from the second source is mixed with fluid from the first source and the valve assembly communicates the increased flow to the motors thus obtaining a faster motor speed.

Abstract: Marker includes a three-phase ink circuit to transport ink from a large capacity reservoir through an intermediate capillary phase to a generally porous writing tip. Each phase of the ink circuit contains capillary ink transporting material. Arrangement of the phases in order of increasing capillarity draws ink from the low capillarity reservoir through a small diameter intermediate conduit to the generally porous writing tip.

Abstract: Truncated pen with ball point writing tip, designed to contain a large volume liquid ink supply within a short axial length body includes a short axial length, wide diameter pen barrel. A liquid ink reservoir, housed inside of the barrel, is separated from a pressure regulation mechanism by a thin diaphragm. The pressure regulation mechanism constantly applies pressure on the ink supply contained within the ink reservoir, so that ink will be supplied to the writing tip regardless of the position in which the pen is disposed or the volume of ink remaining in the reservoir.

Abstract: A thermographic stylus apparatus includes a bimetal spring element in the pen arm and a resistive heating means. The pressure exerted by the scribing element on the writing platen is varied in linear proportion to the total power consumed in the resistive heating means which causes bending or at least a tendency to bend in the bimetal.

Abstract: A pen for use in recording instruments includes integral hinged member which folds over and locks in place on a pen arm and thus facilitates attachment of pen and pen arm. Preferably, integrally molded ribs are included to press into and to better secure the pen arm upon locking engagement of the hinged member.