Abstract: A durable shroud is provided for roof ventilators to prevent warm air from escaping through ventilators openings as well as to provide a protective cover for the ventilator in inclement weather. The ventilator is comprised of two hemispherical segments that are coupled to form a complete hemisphere about a roof ventilator. Therefore, weather elements are prevented from contacting the ventilator and heat from within is prevented from escaping through the ventilator openings.

Abstract: A dispensing container for storing and dispensing pre-packaged quarter pound segments of softened butter or similar dispensible materials. Segments of butter pre-packaged in plastic envelopes are constrained between a movable butter feed plate and a stationary base in conjunction with a sealing plate within the container for dispensing butter therefrom. The sealing plate includes a hinged sealing edge that cooperates with a rigid feed lip at the front of the container to define a feed passageway and to seal an end of the envelope that is disposed therebetween. Depressing the feed plate compresses the pre-softened butter within the packaging envelope to open the feed passageway and force butter through the envelope end. When the feed plate is released, the feed passageway is automatically sealed.

Abstract: A power transmission drive belt having a plurality of equally spaced teeth of identical contour disposed along its length. The teeth include a crest with driving and trailing faces depending therefrom to a valley below. An apex is disposed on each tooth and in each valley to provide minimum engagement between the belt and a pulley, resulting in a quiet running power transmission drive system.

Abstract: A speed retarding governor particularly adaptable to a carriage of a typewriter wherein the speed of a traversing typewriter carriage is retarded by the cooperation of a plurality of arcuate pivotless lightweight flyweights that are floatably disposed within a cylindrical governor housing. A drive pin fixed to a rotating typewriter escapement toothed drive wheel engages an end of a first flyweight which abuts a second flyweight whereby both flyweights rotate therewith. The centrifugal force thus generated forces the two felt-lined flyweights outwardly against the internal peripheral surface of the governor housing which has now been rendered stationary, to produce a retarding force necessary to retard the speed of the traversing carriage.

Abstract: A pulley for a high speed positive drive system for business machines. The uppermost contour of the teeth of the pulley in combination with the contour of the valleys therebetween, when functionally engaged by a standard positive drive timing belt, provides a quiet running power transmission drive system.

Abstract: A method and mechanism for automatically performing a typewriter function such as backspacing a carriage where the backspace mechanism is actuated upon removal of an insertable and removable ribbon cartridge. Particularly adaptable to correcting typing errors, the present invention will automate the final backspacing operation that is necessary before the correct character is typed and normal typing can be continued. A modified ribbon cartridge containing error correction ribbon carries at least one abutment that engages a backspace coupled actuating mechanism upon removal of the ribbon cartridge. Therefore, automatic backspacing of the typewriter carriage occurs after a modified ribbon cartridge is inserted into the typewriter to perform an error correction operation simply by removing the error correction ribbon cartridge.

Abstract: A method and mechanism for automatic actuation of single and repeat typewriter functions such as backspacing upon the insertion and removal of a ribbon cartridge. The ribbon cartridge, carrying a bidirectional camming abutment having a pair of converging cam surfaces is inserted into the typewriter, whereupon a first cam surface engages a backspace coupled cam lever within the typewriter, thereby actuating a typewriter backspace function. The cam lever includes a pair of convergingly directed cam surfaces joined by a dwell surface. As the cartridge camming abutment contacts the dwell surface, it actuates a repeat backspace function until the camming abutment passes beyond the dwell surface of the cam lever. The camming abutment includes a second cam surface that engages a second cam surface disposed on the cam lever to actuate a backspace function upon removal of the ribbon cartridge.

Abstract: A typewriter ribbon cartridge carrying at least one abutment thereon for engaging one or more typewriter functions and responsive means or mechanism to thereby actuate the typewriter function mechanism when the ribbon cartridge is inserted into the typewriter.

Abstract: An insertable and removable typewriter cartridge having an abutment thereon for automatically engaging a function coupled responsive means of a typewriter to actuate the typewriter function mechanism when the cartridge is removed from the typewriter.

Abstract: A method and mechanism for automatically performing typewriter functions such as backspacing and disabling the escapement mechanism of a typewriter. A ribbon cartridge carrying actuating abutments is inserted into the typewriter whereupon the abutments engage a mechanism to actuate a selected function as for example the backspace mechanism and also engage another mechanism to disable the escapement mechanism. Particularly adaptable to correcting typing errors, the present invention will minimize the manipulations now necessary to perform an error correcting operation. Having typed an erroneous character, the operator simply inserts a ribbon cartridge containing the actuating abutments. One of the abutments contacts an actuating mechanism within the typewriter to backspace the carriage. The second abutment contacts a second actuating mechanism within the typewriter to disable the escapement mechanism to prevent carriage movement during error correction or until the ribbon cartridge is removed.

Abstract: A typewriter ribbon cartridge having a camming abutment thereon for engaging one or more typewriter function responsive means to thereby actuate the typewriter function mechanism when the ribbon cartridge is inserted into the typewriter and thereafter to re-engage the responsive means to actuate the function mechanism a second time when the ribbon cartridge is removed from the typewriter.

Abstract: A method and mechanism for automatically performing typewriter functions such as backspacing a carriage. The backspace mechanism is actuated by the insertion and removal of a ribbon cartridge that is placed on and guided by a ribbon cartridge platform and is especially suited for use in conjunction with the correction of erroneously typed characters.The ribbon cartridge carries a pair of cam surfaces that engage a pair of typewriter backspace coupled cam surfaces to actuate a backspace function upon insertion and again upon removal of the ribbon cartridge. Therefore, automatic multiple backspacing of the typewriter carriage occurs when performing an error correcting operation simply by inserting and removing a correction ribbon cartridge.Although a backspace function has been selected for purposes of demonstration, the hereafter disclosed embodiment may be utilized to actuate other typewriter functions upon the insertion and removal of the ribbon cartridge.

Abstract: A typebar support for low cost typewriters includes an arcuate segment supported on a frame where a plurality of typebars are pivotally mounted. The free ends of the typebars are supported by an arcuate support. The support is rockably suspended on the frame by a pair of arms extending from the ends of the support to the frame. The arms are biased upward by a pair of springs and limited in its upward movement by an abutment mounted on the segment. As a typebar returns to rest after a print cycle has been completed, the energy accumulated in the typebar during flight is partially dissipated when it impacts on a yieldable pad on the typebar receiving edge of the support. The remaining energy is absorbed by the rocking motion of the support. The energy dissipation by the yieldable pad combined with the energy absorption by the rockable support results in a typebar support that effectively reduces typebar rebound and the accompanying problems.

Abstract: A changeable type element for typebars of a typewriter is disclosed comprising a U-shaped member having a pair of walls spaced from one another by a connecting type face. The type element is multipositional within the typebar segment of the typewriter. A camming means is pivotally supported between the spaced walls. A spring, attached to the camming means biases the camming means into locking engagement with the typebar when the type element is assembled on the free end of the typebar. The spring compensates for any wear on the camming means to prevent the camming means from disengaging from the typebar. The type element is thereby prevented from flying off the typebar when the typebar is in flight or from becoming loose from repeated printing operations.

Abstract: A keylever touch control mechanism for typewriters includes keylevers mounted on a common pivot which spans the distance between the spaced side frames of the typewriter. The keylevers are supported in their rest position by a plurality of underlying leaf springs. Keylever touch is controlled by the amount of force exerted on the underside of the keylevers by the leaf springs. A spring loaded pivotal bail having rigid extensions underlying the leaf springs pivots into abutment with the springs to vary the tension of the springs. A detented control mechanism is coupled to the bail to pivot the bail extensions into and out of abutment with the leaf springs. When the bail extensions are pivoted into abutment with the leaf springs and a keylever is depressed, the force required to overcome the biasing force of the spring loaded bail extensions to depress a keylever is increased and the keylever touch is correspondingly increased.