# US 4,376,346 A · Perpetual calendar > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,376,346 A - Document ID: US4376346A - Status: Granted - Kind: A - Application number: 06/313,980 - Filed: 1981-10-22 - Granted: 1983-03-15 - Earliest claimed: 1981-10-22 - Inventors: Milton T. Nelson - Web page: https://patentgrep.com/patent/US4376346A ## CPC - G09D 3/06: with rotatable members - G09D: RAILWAY OR LIKE TIME OR FARE TABLES; PERPETUAL CALENDARS (calendar blocks B42D5/04; clockwork driven G04B; comprising computing means G06C) ## Abstract First and second superposed members are mounted for relative back and forth movement along a predetermined path and one of the members has a generally rectangular window formed therein. The other of the members includes number indicia arranged in seriatim repetitively in coordinates of seven extending along the path with the coordinates spaced transversely of the path. The window is of a dimension transverse to the path to view the six laterally spaced coordinates of indicia therethrough and of a dimension longitudinally of the path to view seven indicia in each coordinate. A view masking panel is disposed intermediate the first and second members and includes a pair of elongated side-by-side indicia masking zones thereof extending along the path and including one pair of corresponding ends facing in one direction along the path and staggered lengthwise relative to the path a distance equivalent to at least seven of the indicia spaces. The view masking panel is shiftable along the path relative to the first and second members and may be utilized to selectively mask portions of two of the coordinates of indicia spaces extending along one side of the aforementioned path. ## Claims ### Claim 1 A perpetual calendar including first and second superposed panel member portions mounted for relative back and forth movement along a predetermined path, one of said panel member portions having a generally rectangular window formed therein, the other of said panel member portions including number indicia arranged thereon in seriatim repetitively in coordinates of seven extending along said path and including rows of indicia spaced transversely of said path, said window being of a dimension transverse to said path to view six laterally spaced rows of spaces therethrough and of a dimension longitudinally of said path to view seven indicia spaces in each row, and a single view masking panel member portion disposed intermediate said first and second panel member portions and including a pair of elongated side-by-side indicia space masking strip portions extending along said path and including one pair of corresponding ends facing in one direction along said path and staggered lengthwise of the latter a distance equivalent to at least seven of said indicia spaces, said view masking strip portions being manually shiftable along said path to selectively mask the two rows of spaces adjacent one longitudinal side of said window. ### Claim 2 (depends on 1) The calendar of claim 1 wherein said first and second panel member portions comprise relatively rotatable and telescoped cylindrical members, said view masking panel comprises a cylindrical member interposed between said first and second cylindrical members and said back and forth movement comprises relative angular oscillation of said cylindrical members about concentric axes. ### Claim 3 (depends on 1) The calendar of claim 1 including a fourth cylindrical member telescopingly engaged with and rotatable relative to said first cylindrical member, said first cylindrical member including three additional windows formed therein, said fourth cylindrical member including 12 sets of month, year month and month day indicia formed thereon, said sets of indicia being selectively registrable with said three additional windows. ### Claim 4 (depends on 3) The calendar of claim 3 including coacting detent means carried by said first and second cylindrical members operative to releasably retain said first and second cylindrical members in predetermined relatively rotated positions. ### Claim 5 (depends on 4) The calendar of claim 4 wherein said fourth cylindrical member and said first cylindrical member also include coacting detent means operative to releasably retain said fourth cylindrical member in predetermined rotated positions relative to said first cylindrical member. ### Claim 6 (depends on 1) The calendar of claim 1 wherein said first and second panel member portions include coacting detent means operative to releasably retain said first and second panel member portions in predetermined shifted positions relative to each other. ### Claim 7 (depends on 1) The calendar of claim 1 wherein said first cylindrical member includes three additional windows formed therein, a fourth cylindrical member shiftably supported from said first cylindrical member and including 12 sets of month, year month and month total days indicating indicia thereon, said sets of indicia being selectively registrable with said three additional windows. ### Claim 8 (depends on 7) The calendar of claim 7 wherein said first and fourth cylindrical members include coacting detent means operative to releasably retain said first and fourth members in predetermined adjusted shifted positions. ### Claim 9 A perpetual calendar including an upstanding cylindrical body, a first generally cylindrical and upwardly opening cup member rotatably and snugly telescopingly received in the upper end of said body and including an upper end outwardly projecting flange downwardly abutted against an upwardly facing peripherally extending surface defined by said cylindrical body, a second upwardly opening and generally cylindrical cup member rotatably and snugly telescopingly received in the lower end of said body and including a lower end outwardly projecting flange upwardly abutted against a downwardly facing peripherally extending surface defined by said body, spring means operatively associated with and yieldingly resisting upward and downward displacement of said first and second cup members, respectively, relative to said body, said body and cup members including coacting detent means operative to releasably lock said cup members in predetermined rotated positions relative to said body and to allow selective rotation of said cup members relative to said body upon upward and downward displacement of said first and second cup members, respectively, relative to said body, said body having a small area month indicating viewing window formed therein and a large viewing window formed therein, said upper cut members including month indicating indicia formed thereon and spaced thereabout selectively registrable with said small month indicating viewing window, said lower cup member including number indicia arranged thereon in seriatim repetitively in coordinates of seven extending about said cup member and including vertically spaced rows of indicia, said large viewing window being of a vertical dimension to view six vertically spaced rows of spaces therethrough and of an angular dimension to view seven indicia spaces in each row. ### Claim 10 (depends on 9) The calendar of claim 9 wherein each of said cup members includes a bottom wall, said spring means comprises a spring connected between central portions of said bottom walls. ### Claim 11 (depends on 9) The cup of claim 9 wherein said body has additional small area month day and week day viewing windows formed therein, said upper cup including month day and week day indicating indicia formed thereon and spaced thereabout each selectively registrable with said additional viewing windows. ### Claim 12 (depends on 9) The calendar of claim 9 wherein said cylindrical body includes an upper portion in which said month indicating viewing window and said large viewing window are formed and a lower portion telescopingly and rotatably engaged with the lower end of said upper portion, said lower portion including elongated side-by-side indicia space masking strip portions extending peripherally about said lower portion and including one pair of corresponding ends spacing in one direction thereabout and staggered about the periphery of said lower portion a distance equivalent to at least seven of said indicia spaces, said lower portion being angularly displaceable relative to said cylindrical body and cup members to selectively mask the lower two rows of spaces. ### Claim 13 (depends on 12) The calendar of claim 12 wherein said lower end flange is upwardly abutted against the lower end of said lower portion. ### Claim 14 A perpetual calendar including first and second relatively telescopingly and rotatably engaged generally cylindrical members mounted for angular oscillation relative to each other, the outer cylindrical member having a generally rectangular window formed therein, the inner cylindrical member including number indicia arranged thereon in seriatim repetitively in coordinates of seven extending about the circumference of said inner cylindrical member and including rows of indicia spaced axially of said inner cylindrical member, said window being of a dimension axially of said outer cylindrical member to view six axially spaced rows of indicia therethrough and of an angular dimension about said outer cylindrical member to view seven indicia spaces in each row, a single generally cylindrical masking panel member disposed intermediate the first and second cylindrical members including a pair of elongated side-by-side indicia space masking strip portions extending peripherally thereabout and including one pair of corresponding ends facing in one direction thereabout and staggered lengthwise therealong a distance equivalent to at least seven of said indicia spaces, said masking panel member being manually angularly displaceable relative to said first and second cylindrical members to selectively mask two rows of spaces adjacent one edge of said window extending about said outer cylindrical member.