Typewriter

Claim 2

In a typewriter, a unitary escapement cartridge control for a carriage to which is affixed a rack gear, comprising a molded encasement having an access slot and openings therein, a slide bar slidable in said slot, said slide bar being actuatable through a displacement and return cycle by depression and release of a typewriter key or of a space-bar, an escapement mechanism including two pawls, each having an integrally molded biasing finger and a ratchet wheel in said encasement operatively connected to said slide bar through said pawls and rotatable through the pitch distance of said ratchet wheel by one cycle of said slide bar, said escapement mechanism engaging said rack gear through a first opening, and biasing means within said encasement for urging said carriage in a single direction, said biasing means engaging said rack gear through a second opening in said cartridge encasement, thereby providing for intermittent displacement of said carriage in response to actuation of a typewriter key or space bar.

Claim 3

A unitary escapement cartridge control as defined in claim 1, wherein the first of said pawls is so biased that in rest position it engages said ratchet wheel, holding it against rotation, and further comprises a second slot in said encasement adjacent said first pawl, a second slide-bar in said second slot, said second slide bar being rearwardly slidable in said second slot by an externally applied force, and retracting means operatively connecting said second slide bar with said first pawl for disengaging said first pawl from said ratchet wheel, thereby releasing said ratchet wheel for unrestricted rotation and freeing said carriage from constraint against movement to either side.

Claim 4

A unitary escapement cartridge control as defined in claim 1, wherein said biasing means comprises a cylindrical housing within said encasement, a gear mounted coaxially with said housing at one end of said housing for conjoint rotation therewith, part of said gear protruding through the second of said openings in said encasement and engaging with said rack gear on said carriage, a cylinder centered in said housing, one end of said cylinder protruding through said second opening in said encasement, said cylinder being rotatable by an externally applied force to a fixable position, and a clockspring within said cylindrical housing operatively connecting said housing with its coaxially mounted gear and said cylinder so that movement of said carriage by an externally applied force in a direction opposite to said single direction tensions said clockspring, and so that said clockspring drives said rack gear and carriage in said single direction in conformity with the action of said escapement in response to actuation by keys and space bar.

Claim 5

A unitary escapement cartridge control as defined in claim 3, wherein the position of said cylinder subsequent to rotation is fixed by means of a position-fixing ratchet mounted on said cylinder and a third pawl, said position-fixing ratchet rotating conjointly with said cylinder in a direction such that the tension in said clockspring is increased.

Claim 6

A unitary escapement cartridge control as defined in claim 4, wherein said position-fixing ratchet and said third pawl are mounted externally of said encasement, thereby making it possible to disengage said third pawl from said position-fixing ratchet manually and rotate said cylinder to a position of lower tension and to fix said cylinder in such position by re-engagement of said third pawl with said position-fixing ratchet.

Claim 7

A unitary escapement cartridge control as defined in claim 1, wherein a third slide bar is disposed slidably in a third slot in said encasement, said third slide bar in rest position blocking removal of said carriage from said typewriter, said third slide bar being movable rearwardly by an externally applied force to permit remOval of said carriage, said third slide bar having integrally molded fingers which are stressed in rearward motion of said slide bar, said fingers urging said third slide bar to rest position after removal of said externally applied force.

Claim 8

A unitary escapement cartridge control as defined in claim 1, wherein said encasement cartridge has opposing faces, and a notch on each side of said first slot further comprising a pair of bearings mounted on one of said faces in the region of said first slot, a vibrator shaft mounted rotatably in said bearings, two vibrator bell cranks coupled to each other for conjoint rotation and mounted on said vibrator shaft as a fulcrum, with a first leg of each vibrator bell crank movable within one of said notches in response to activation by a key, and a ribbon holder mounted on the second legs of said vibrator bell cranks, said ribbon holder being vibratable between a lower rest position and an upper position for registering of a character as the result of activation of said vibrator bell cranks by a key.

Claim 9

In a typewriter, a unitary escapement cartridge control for a carriage to which is affixed a rack gear, comprising a molded encasement having an access slot and openings therein, a slide bar slidable in said slot, said slide bar being actuatable through a displacement and return cycle by depression and release of a typewriter key or of a space-bar, an escapement mechanism including two spring biased pawls, a ratchet wheel in said encasement operatively connected to said slide bar through said pawls and rotatable through the pitch distance of said ratchet wheel by one cycle of said slide bar, said escapement mechanism engaging said rack gear through a first opening, and biasing means within said encasement for urging said carriage in a single direction, said biasing means engaging said rack gear through a second opening in said cartridge encasement, thereby providing for intermittent displacement of said carriage in response to actuation of a typewriter key or space bar.

Claim 10

In a typewriter, a unitary escapement cartridge control for a carriage to which is affixed a rack gear, comprising a molded encasement having an access slot and openings therein, a slide bar slidable in said slot, said slide bar being actuatable through a displacement and return cycle by depression and release of a typewriter key or of a space-bar, an escapement mechanism including two spring biased pawls, a ratchet wheel in said encasement operatively connected to said slide bar through said pawls and rotatable through the pitch distance of said ratchet wheel by one cycle of said slide bar, said escapement mechanism engaging said rack gear through a first opening, and biasing means within said encasement for urging said carriage in a single direction, said biasing means engaging said rack gear through a second opening in said cartridge encasement, thereby providing for intermittent displacement of said carriage in response to actuation of a typewriter key or space bar.