Abstract: A stand for receiving a tubular writing pen which comprises an insertion opening, a sealing element of elastically deformable material disposed below the insertion opening and adapted to come into a sealing engagement contact with the free end of the writing tube of an inserted tubular writing pen. The sealing element (4) has a bearing area for contact with a writing tube (12) that is convex curved in the direction toward said insertion opening of the stand (1, 2) and is deformable away from said insertion opening by contact with the tube. The stand further is characterized by an elastically deformable restraining element (5) which is provided between said sealing element (4) and said insertion opening, and adapted to engage against an inserted tubular writing pen (10, 11, 12).

Abstract: A drawing pen exchanging device for transferring a drawing pen between a drawing head (4) and a drawing pen magazine (5) in a computer controlled drawing device. The drawing pen (7) is held against a stationary holding area in the drawing head (4) with the aid of a spring holding element (14) and against a stationary receptacle area (11, 12) in the drawing pen magazine (5) by means of a spring-pressure element (24). Through a sliding cooperation with a guide (25) provided to the side of the stationary holding area (21,22), the holding element (14) is swung out to transfer the drawing pen (7) from the drawing head (4) into the drawing pen magazine (5) and the drawing pen (7) then will be held back by the pressure element (24) in the drawing pen magazine (5). When the drawing pen (7) thereafter is to be removed from the drawing pen magazine (5) the holding element (14) is operable not to engage the guide (25) and thereby will pull the drawing pen (7) from the drawing pen magazine (5) (FIG. 2).

Abstract: In a device for exchanging objects, in particular writing instruments, two substantially identically embodied holders (5, 5') which are open at one side are provided. These holders are movable relative to one another in a plane extending substantially at right angles to there longitudinal axes (12, 12'). The object to be exchanged is held in a receptacle (20), which in cross section has substantially the shape of a regular, convex n-gon having an uneven number of sides. At each corner of the receptacle (20), there is an element of ferromagnetic material (22, 23, 24), and there is a permanent magnet (6, 6') on the inner face, located opposite the open side, of the receiving area of each holder (5, 5'). The receptacle (20) is positionally fixed in a holder (for instance, 5') by means of the aligned position of an element (23) of ferromagnetic material and of a permanent magnet (6', for example).

Abstract: In an automatic drafting apparatus having at least one tubular writing pen (1) held in a drawing head (3), and movable between a rest position, in which the lower end of its tubular writing tip (2) is sealed by a laterally movable sealing element (9), and into a raised intermediate position, in which the element (9) is moved laterally out of the way of the writing tip (2), enabling the writing pen (1) then vertically to be lowered into a drawing position. An improved actuation element (11) means is moved laterally back and forth to move both the tubular writing pen (1) and the sealing element (9). This actuation element further comprises a cam or guide contour surface (13, 14, 15, 16) to engage a pin guide operatively connected to the writing pen, thereby to effect vertical movement of the writing pen (1) and also an oblong lateral recess coupled with the sealing element (9) through a second pin (19), for the purpose of defining a selective lateral displacement of the sealing element.

Abstract: Tubular writing pens of the stylographic type, particularly a felt tip pen. A cylindrical hollow body supports an ink reservoir at one end and a felt tip which extends from the ink reservoir through the front of the hollow body. The tubular body encompasses the writing element, while defining an inner pressure equalization chamber in its outer wall and a longitudinally extending axial groove in its inner wall, exposed throughout its length to the felt tip writing instrument. An intermediate cylindrical piece complementally engages the exterior wall of the cylindrical body, so as to cover the inner pressure equalization chamber and define in its exterior wall an outer pressure equalization chamber, communicant with the inner chamber. An outer sleeve complementally engages the intermediate piece, so as to cover the outer equalization chamber and define at its posterior end a reservoir seat.

Abstract: A stand for writing utensils, particularly tubular writing pens, which comprise a lower part that can be placed on a base, and an upper part, that is pivotally mounted on the lower part and has at least one hole for receiving a writing pen. The upper part engages the lower part by means of laterally extending bearing pins, which extend from at least two supports which extend upwardly from the lower part. The invention is significantly characterized in that the bearing pins, 6 and 7, are provided on the upper end region of the supports, 4 and 5, and that within the top part, 10, are guide slots, 16, which are open to the bottom of the upper part and extend upwardly for the bearing pins, 6 and 7. Hence, the top part, 1, may rest in a tilted position due to a frictional cooperation between the guide pins and the guide slots, and a bearing by a longitudinal edge upon the bottom part, 1.

Abstract: A lettering device of the type having a keyboard for choosing the symbols to be written, comprising a writing part, which may be separated from said keyboard, wherein the pen is selectively moved by two geared motors, in two coordinate directions, to correspond to the symbols to be drawn. The writing part is adapted to be attached to the symbol head of a drafting machine, wherein two motors, that selectively move the writing pen along cartesian coordinates, are arranged stationary, relative to each other. The writing arm which holds the writing pen is movable, in the one coordinate direction, upon a first movable guide track that itself is movable in the other coordinate direction by a first motor, and also movable in the other coordinate direction upon a second guide track, that is movable in the direction of said one coordinate by a second motor.

Abstract: A process for producing a drawing stencil characterized in that a plastic border edging is applied, by a spray or injection molding, upon a preformed stencil sheet. A further feature disclosed is the use of a lubricated interface between a border edging and a stencil sheet, to relieve stress buildup and resultant distortion of the stencil.

Abstract: The invention refers to an improved writing fluid cartridge or writing fluid tank with a connection section at the front end for attachment to a writer, especially a tube writer, wherein the cartridge is divided into at least two sealably separate compartments, one of which having an ink capacity equal to substantially the ink capacity of the writer body.

Abstract: A disposable ink reservoir cartridge which is attachable to tubular writing pens of the stylographic type embodying a pressure compensating chamber. The reservoir cartridge is characterized by its axial deformability, such that the free volume of the reservoir may be reduced, as ink flows from the reservoir into the pressure compensating chamber during pen use. The reduction in free volume of the reservoir eliminates available air space and, thereby, avoids the deleterious effects of air pressure changes upon the ink or writing fluid, as the reservoir is depleted.

Abstract: A capillary writing pen of the type having an expansion or compensation chamber intermediate the ink reservoir and ambient air. The expansion chamber is improved such that inadvertent flowing of ink from the reservoir to the capillary pen tip due either to pressure or temperature changes is avoided. The interior wall of the expansion chamber is profiled as a contiguous series of transverse indentations which extend circumferentially about the tubular pen body to provide successive expansion areas for entrapment of air and constrictive areas where menisci of ink are formed. The forming of the menisci entraps air bubbles within the ink and, accordingly, provides increased resistance to capillary flow of ink.

Abstract: Method of regulating ink flow in automatic drafting pens of the type supporting a plurality of stylographic pens in parallel, including pumping ink from a reservoir into the writing pen capillary tubes, gauging the level of ink intermediate the reservoir and the capillary tubes and modifying said pumping as the gauged, actual level of ink flow may deviate from a desired level of ink flow. The method includes buffering of ink flow into the capillary tubes, so as to overcome the effects of inertia (when the pen is not writing), as well as the surge of ink flow under pumping pressure.

Abstract: A sealing element for an automatic drafting pen with a tubular tip wherein a reciprocating horizontal actuating means that acts through a linkage operates a horizontal slide that in one position permits the pen to contact the drafting surface and in a second position seals the pen with the horizontal slide.

Abstract: A compass housing of the type used for supporting a pair of adjustable compass legs in resilient contact with a spring clip. The housing includes a transverse cross-shaft as a bearing for the upper ends of the compass legs and an elongated rib, upraised to define a fulcrum for the spring clip. The housing is characterized by its unitary construction.

Abstract: A device for cleaning ink pen points of the type which are removable from an ink pen. The device includes an upper section and a lower section complementally engagable with each other, so as to support the pen point in a vertical attitude for sequential attack by cleaning water and drying air. The device includes a jet pump portion actuated by the cleaning water, so as to advance drying air through the pen point. The device is characterized by its mechanical simplicity, yet extreme effectiveness in cleaning artists and stylographic drafting pen points.