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US 5,026,190 AGranted
Dual writing element retractable pen
Assignee2C Co. Corp.
InventorRoland Longarzo
Life of this patent
Estimating the term…
Abstract
A dual writing element retractable pen includes coaxial upper and lower barrel members, an upper cylindrical cam part being integrally formed with the upper barrel member and having a bottom cam surface. A matching lower cylindrical cam part telescopes the upper barrel member and is oriented so that the confronting end faces of the cam parts delineate a cam groove having opposite oppositely inclined sections. A rotatable guide member longitudinally slideably supports pen cartridge coupled chucks having followers engaging respective cam groove sections, the guide member being coaxial with the barrel. In one form, the lower cam member is integrally formed with the lower barrel member and, in another form, the lower cam and barrel members are an integrally molded unit and the guide member terminates in an external finger knob.
Claims27
A writing instrument comprising:
- an upper barrel member having integrally formed on its upper inside face a cylindrical cam first part having along its bottom a top cam face;
- a separate cylindrical cam second part telescoping and contiguous to the lower part of said upper barrel member and having along its top a bottom cam face complementing said top cam face and positioned and oriented relative to said top cam face to delineate a cylindrical cam track including peripherally spaced oppositely longitudinally peripherally inclined cam track sections, said upper barrel member and said cylindrical cam second part having confronting peripheral faces in mutual interference engagement;
- a longitudinal guide member coaxial with and rotatable relative to said cam track and including a pair of peripherally space longitudinal guide tracks;
- a chuck member slidably engaging each of said guide tracks and including a follower projecting transversely into sliding engagement with a respective cam track section;
- a lower barrel member depending from and coaxial with said upper barrel member and terminating at its bottom end in an axial aperture;
- and
- a writing element engaging and movable with each of said chucks and extending downwardly toward said lower barrel member bottom end.
4 more elements
A dual selectively protractable writing element writing instrument comprising:
- a tubular first barrel member;
- a cylindrical cam coaxially locate in said barrel member and having a cylindrical cam groove with opposite oppositely inclined cam groove sections, defined by parallel axially opposite faces;
- a longitudinally stationary rotatable guide member coaxial with said cylindrical cam and having formed therein a pair of peripherally opposite longitudinally extending guideways;
- a chuck member slidably engaging each of said guideways and including a transversely projection follower slideably engaging a respective cam groove section;
- and
- a writing element coupled to each of said chucks;
- said writing instrument being characterized by said cylindrical cam including axially spaced coaxial first and second cam parts with said cam groove faces being defined by the confronting spaced end faces of said cam parts, said first cam part being integrally formed with said barrel member and said second cam part telescoping and being contiguous to said first barrel member, said second cam part and said barrel member having confronting peripheral faces in mutual interference engagement.
4 more elements
A writing instrument comprising:
- an upper barrel member having integrally formed on its upper inside face a cylindrical cam first part having along its bottom a top cam face;
- a cylindrical cam second part telescoping the lower part of said barrel member and having along its top a bottom cam face complementing said top cam face and positioned and oriented relative to said top cam face to delineate a cylindrical cam track including a peripherally spaced oppositely longitudinally peripherally inclined cam track sections, the confronting telescoping faces of said upper barrel member and cam second part having mating indexing formations positioning said upper barrel member and said second cam part in a predetermined relative angular relationship wherein said upper and lower cam faces are parallel and equidistant;
- a longitudinal guide member coaxial with and rotatable relative to said cam track and including a pair of peripherally space longitudinal guide tracks;
- a chuck member slidably engaging each of said guide tracks and including a follower projecting transversely into sliding engagement with a respective cam track section;
- a lower barrel member depending from and coaxial with said upper barrel member and terminating at its bottom end in an axial aperture;
- and
- a writing element engaging and movable with each of said chucks and extending downwardly toward said lower barrel member bottom end.
4 more elements
A dual selectively protractable writing element writing instrument comprising:
- a tubular first barrel member;
- a cylindrical cam coaxially locate in said barrel member and having a cylindrical cam groove with opposite oppositely inclined cam groove sections, defined by parallel axially opposite faces;
- a longitudinally stationary rotatable guide member coaxial with said cylindrical cam and having formed therein a pair of peripherally opposite longitudinally extending guideways;
- a chuck member slidably engaging each of said guideways and including a transversely projection follower slideably engaging a respective cam groove section;
- and
- a writing element coupled to each of said chucks;
- said writing instrument being characterized by said cylindrical cam including axially spaced coaxial first and second cam parts with said cam groove faces being defined by the confronting spaced end faces of said cam parts, said first cam part being integrally formed with said barrel member and said second cam part having mating indexing formations to provide a predetermined angular relationship between said first and second cam parts.
4 more elements
Dependencies are inferred from the claim text.