# US 8,539,803 B2 · Cylinder lock with profiled keyway > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,539,803 B2 - Document ID: US8539803B2 - Status: Granted - Kind: B2 - Application number: 13/184,305 - Filed: 2011-07-15 - Published: 2011-11-10 - Granted: 2013-09-24 - Earliest claimed: 2009-02-18 - Assignees: Winloc AG - Applicants: Bo Widén - Inventors: Bo Widén - Web page: https://patentgrep.com/patent/US8539803B2 ## CPC - E05B 19/0029: {characterized by varying cross-sections of different keys within a lock system (cross-sections of single keys E05B19/0041)} - E05B 19/0017: {Key profiles} - E05B 27/0078: {Asymmetrical tumbler pins, e.g. with a key operating on a radial protrusion of a tumbler pin} - E05B 27/0082: {Side bar locking} - E05B 19/007: {with U- or V-shaped cross-section} - Y10T 70/7588: Rotary plug - Y10T 70/7605: Pin tumblers - Y10T 70/7616: Including sidebar - Y10T 70/7627: Rotary or swinging tumblers - Y10T 70/7859: Flat rigid - Y10T 70/7864: Cylinder lock type - Y10T 70/787: Irregular nonplanar or undulated - Y10T 70/7881: Bitting - E05B: LOCKS; ACCESSORIES THEREFOR; HANDCUFFS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A cylinder lock with a rotatable key plug (112) having a profiled keyway (113,116), the keyway being configured to accommodate an elongated, substantially flat key blade (120) with a longitudinal groove (122). The keyway in the key plug has two opposite lateral sides and a profile rib (150) located at a substantially flat lateral side. The profile rib has a downwardly projecting tongue portion (161) configured to extend inside the profile groove (122) upon inserting the key (120) into the key plug (112) of the lock, and the tongue portion of the profile rib is extended downwardly into a lowermost, massive end portion (162) which has two opposite side surfaces (163,164) and a lowermost transverse end surface (165) which is substantially flat or slightly curved. The lowermost, massive end portion (162) extends downwardly in a direction which is parallel to a central longitudinal plane (A′) through said keyway, and the lowermost transverse end surface (165) extends substantially in a plane which is perpendicular to a the central longitudinal plane (A′). ## Claims ### Claim 1 A cylinder lock with a rotatable key plug (112) having a profiled keyway (113,116), said keyway being configured to accommodate an elongated, substantially flat key blade (120) having a longitudinal groove (122), wherein said keyway has two opposite lateral sides, which are substantially parallel to each other, and a profile rib (150) projecting outwardly from one of said opposite lateral sides into the keyway, said profile rib having a downwardly projecting tongue portion (161) configured to extend inside said profile groove (122) upon inserting said key (120) into said key plug (112) of the lock, and wherein said tongue portion of the profile rib having a uniform width and extending downwardly from a base portion of said profile rib, down into a lowermost end portion which has two opposite substantially parallel side surfaces and a lowermost transverse end surface which is substantially flat or slightly curved, said lowermost end portion extending downwardly in a direction which is parallel to a central longitudinal plane (A′) through said keyway, said lowermost transverse end surface extending substantially in a plane which is substantially perpendicular to a said central longitudinal plane (A′), and the vertical dimension (h′) of said downwardly projecting tongue portion (161), measured in a plane parallel to said lateral sides (117,117′, 118,118′) of said keyway (113,116), is greater than half of the smallest height (w′) of said profile rib adjacent to said one lateral side (117,118) of the keyway, also measured in a plane (A′) being parallel to said lateral sides of said keyway. ### Claim 2 (depends on 1) The lock as defined in claim 1, wherein said vertical dimension (h′) of said tongue portion (161) is greater than said smallest height (w′) adjacent to said one lateral side of the keyway. ### Claim 3 (depends on 1) The lock as defined in claim 1, wherein said lowermost end portion (162) of the tongue portion (161) of said profile rib (150) has a substantially rectangular cross-section. ### Claim 4 (depends on 1) The lock as defined in claim 1, wherein said longitudinal profile rib (150) is interrupted so as to form a number of separated profile elements along the keyway. ### Claim 5 (depends on 4) The lock as defined in claim 4, wherein said lock comprises a side locking tumbler (105) having a transversely projecting finger (105a) located between two consecutive elements of said profile rib, said side locking tumbler being arranged for vertical movement in said keyway. ### Claim 6 (depends on 5) The lock as defined in claim 5, wherein said side locking tumbler (105) is arranged also for rotational movement between two angular end positions. ### Claim 7 (depends on 1) The lock as defined in claim 1, comprising a longitudinal row of upper and lower locking pins (114a,114b), arranged to enable rotation of said key plug (112) when each pair of locking pins are located with abutting end surfaces at a shear line between said key plug (112) and a housing (111) of said lock. ### Claim 8 A cylinder lock with a rotatable key plug (112) having a profiled keyway (113,116), said keyway being configured to accommodate an elongated, substantially flat key blade (120) having a longitudinal groove (122), wherein said keyway has two opposite lateral sides, one of which is substantially flat with a lower part (118) thereof lying substantially in the same plane as an upper part (117) thereof, and a profile rib (150) located at said substantially flat lateral side, said profile rib having a downwardly projecting tongue portion (161) configured to extend inside said profile groove (122) upon inserting said key (120) into said key plug (112)of the lock, and wherein said tongue portion of the profile rib is extended downwardly into a lowermost, massive end portion (162) which has two opposite side surfaces (163,164) and a lowermost transverse end surface (165) which is substantially flat or slightly curved, said lowermost, massive end portion (162) extending downwardly in a direction which is parallel to a central longitudinal plane (A′) through said keyway, and said lowermost transverse end surface (165) extending substantially in a plane which is substantially perpendicular to a said central longitudinal plane (A′), wherein at least one of said opposite side surfaces and said lowermost transverse end surface of said lowermost, massive end portion is provided with an irregular surface portion (167,168,169). ### Claim 9 (depends on 8) The lock as defined in claim 8, wherein said lowermost, massive end portion (162) is substantially uniformly wide. ### Claim 10 (depends on 8) The lock as defined in claim 8, wherein the vertical dimension (h′) of said tongue portion (161), measured in a plane parallel to said lateral sides (117,117′, 118,118′) of said keyway (113,116), is greater than half of the smallest height (w′) of said profile rib adjacent to said one lateral side (117,118) of the keyway, also measured in a plane (A′) being parallel to said lateral sides of said keyway. ### Claim 11 (depends on 10) The lock as defined in claim 10, wherein said vertical dimension (h′) of said tongue portion (161) is greater than said smallest height (w′)adjacent to said one lateral side of the keyway. ### Claim 12 (depends on 8) The lock as defined in claim 8, wherein said lowermost, massive end portion (162) of the tongue portion (161) of said profile rib (150) has a substantially rectangular cross-section. ### Claim 13 (depends on 8) The lock as defined in claim 8, wherein said lowermost, massive end portion (162′) of the tongue portion of said profile rib has a substantially circular cross-section. ### Claim 14 (depends on 8) The lock as defined in claim 8, wherein said lowermost transverse end surface (165′) is curved with a radius being more than half of the width of said lowermost, massive end portion of the tongue portion of said profile rib. ### Claim 15 (depends on 8) The lock as defined in claim 8, wherein said longitudinal profile rib (150) is interrupted so as to form a number of separated profile elements along the keyway. ### Claim 16 (depends on 15) The lock as defined in claim 15, wherein said lock comprises a side locking tumbler (105) having a transversely projecting finger (105a) located between two consecutive elements of said profile rib, said side locking tumbler being arranged for vertical movement in said keyway. ### Claim 17 (depends on 16) The lock as defined in claim 16, wherein said side locking tumbler (105) is arranged also for rotational movement between two angular end positions. ### Claim 18 (depends on 8) The lock as defined in claim 8, comprising a longitudinal row of upper and lower locking pins (114a,114b), arranged to enable rotation of said key plug (112) when each pair of locking pins are located with abutting end surfaces at a shear line between said key plug (112)and a housing (111) of said lock. ### Claim 19 A cylinder lock with a rotatable key plug (112) having a profiled keyway (113,116), said keyway being configured to accommodate an elongated, substantially flat key blade (120) having a longitudinal groove (122), wherein said keyway has two opposite lateral sides, which are substantially parallel to each other, and a profile rib (150) projecting outwardly from one of said opposite lateral sides into the keyway, said profile rib having a downwardly projecting tongue portion (161) configured to extend inside said profile groove (122) upon inserting said key (120) into said key plug (112) of the lock, and wherein a lowermost end portion of said tongue portion of the profile rib having an enlarged width relative to a width of a base portion of the profile rib, said lowermost end portion of said tongue portion extending downwardly from the base portion of said profile rib down into a bulbous end portion having a slightly curved lowermost transverse end surface, said lowermost end portion extending downwardly in a direction parallel to a central longitudinal plane (A′) through said keyway, said lowermost transverse end surface extending substantially in a plane being substantially perpendicular to a said central longitudinal plane (A′). ### Claim 20 (depends on 19) The lock as defined in claim 19, wherein said vertical dimension (h′) of said tongue portion (161) is greater than said smallest height (w′) adjacent to said one lateral side of the keyway. ### Claim 21 (depends on 19) The lock as defined in claim 19, wherein said lowermost end portion (162′) of the tongue portion of said profile rib has a substantially circular cross-section. ### Claim 22 (depends on 19) The lock as defined in claim 19, wherein said lowermost transverse end surface (165′) is curved with a radius being more than half of the width of said lowermost end portion of the tongue portion of said profile rib. ### Claim 23 (depends on 19) The lock as defined in claim 19, wherein at least one of said opposite side surfaces and said lowermost transverse end surface of said lowermost end portion is provided with an irregular surface portion (167,168,169). ### Claim 24 (depends on 19) The lock as defined in claim 19, wherein said longitudinal profile rib (150) is interrupted so as to form a number of separated profile elements along the keyway. ### Claim 25 (depends on 24) The lock as defined in claim 24, wherein said lock comprises a side locking tumbler (105) having a transversely projecting finger (105a) located between two consecutive elements of said profile rib, said side locking tumbler being arranged for vertical movement in said keyway. ### Claim 26 (depends on 25) The lock as defined in claim 25, wherein said side locking tumbler (105) is arranged also for rotational movement between two angular end positions. ### Claim 27 (depends on 19) The lock as defined in claim 19, comprising a longitudinal row of upper and lower locking pins (114a,114b), arranged to enable rotation of said key plug (112) when each pair of locking pins are located with abutting end surfaces at a shear line between said key plug (112)and a housing (111) of said lock. ### Claim 28 A cylinder lock with a rotatable key plug (112) having a profiled keyway (113,116), said keyway being configured to accommodate an elongated, substantially flat key blade (120) having a longitudinal groove (122), wherein said keyway has two opposite lateral sides, which are substantially parallel to each other, and a profile rib (150) projecting outwardly from one of said opposite lateral sides into the keyway, said profile rib having a downwardly projecting tongue portion (161) configured to extend inside said profile groove (122) upon inserting said key (120) into said key plug (112) of the lock, and wherein a lowermost end portion of said tongue portion of the profile rib having an enlarged width relative to a width of a base portion of the profile rib, said lowermost end portion of said tongue portion extending downwardly from the base portion of said profile rib down into an end portion having a slightly curved lowermost transverse end surface and an interior side wall of the tongue portion includes a portion extending at an angle upwardly and outwardly relative to the downward direction of the tongue portion 161, said lowermost end portion extending downwardly in a direction parallel to a central longitudinal plane (A′) through said keyway, said lowermost transverse end surface extending substantially in a plane being substantially perpendicular to a said central longitudinal plane (A′). ### Claim 29 (depends on 28) The lock as defined in claim 28, wherein said vertical dimension (h′) of said tongue portion (161) is greater than said smallest height (w′)adjacent to said one lateral side of the keyway. ### Claim 30 (depends on 28) The lock as defined in claim 28, wherein said lowermost, massive end portion (162) is substantially uniformly wide. ### Claim 31 (depends on 28) The lock as defined in claim 28, wherein said lowermost, massive end portion (162) of the tongue portion (161) of said profile rib (150) has a substantially rectangular cross-section. ### Claim 32 (depends on 28) The lock as defined in claim 28, wherein said lowermost end portion (162′) of the tongue portion of said profile rib has a substantially circular cross-section. ### Claim 33 (depends on 28) The lock as defined in claim 28, wherein said lowermost transverse end surface (165′) is curved with a radius being more than half of the width of said lowermost end portion of the tongue portion of said profile rib. ### Claim 34 (depends on 28) The lock as defined in claim 28, wherein at least one of said opposite side surfaces and said lowermost transverse end surface of said lowermost end portion is provided with an irregular surface portion (167,168,169). ### Claim 35 (depends on 28) The lock as defined in claim 28, wherein said longitudinal profile rib (150) is interrupted so as to form a number of separated profile elements along the keyway. ### Claim 36 (depends on 35) The lock as defined in claim 35, wherein said lock comprises a side locking tumbler (105) having a transversely projecting finger (105a) located between two consecutive elements of said profile rib, said side locking tumbler being arranged for vertical movement in said keyway. ### Claim 37 (depends on 36) The lock as defined in claim 36, wherein said side locking tumbler (105) is arranged also for rotational movement between two angular end positions. ### Claim 38 (depends on 28) The lock as defined in claim 28, comprising a longitudinal row of upper and lower locking pins (114a,114b), arranged to enable rotation of said key plug (112) when each pair of locking pins are located with abutting end surfaces at a shear line between said key plug (112)and a housing (111) of said lock.