# US 8,783,775 B2 · Locking device, especially for an adjustment fitting and especially for a vehicle seat, and vehicle seat > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,783,775 B2 - Document ID: US8783775B2 - Status: Granted - Kind: B2 - Application number: 13/125,790 - Filed: 2008-10-23 - Published: 2011-11-03 - Granted: 2014-07-22 - Earliest claimed: 2008-10-23 - Assignees: Johnson Controls Technology Company - Applicants: Ingo Kienke; Frank Weber; Karthlkeyan S. Maharajapuram - Inventors: Ingo Kienke; Frank Weber; Karthlkeyan S. Maharajapuram - Web page: https://patentgrep.com/patent/US8783775B2 ## CPC - B60N 2/433: Safety locks for back-rests, e.g. with locking bars activated by inertia - B60N 2/20: the back-rest being tiltable, e.g. to permit easy access (B60N2/04, B60N2/22 {, B60N2/3002} take precedence) - B60N 2/2252: {in which the central axis of the gearing lies inside the periphery of an orbital gear, e.g. one gear without sun gear} - B60N 2/2352: {with external pawls} - B60N: SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR ## Abstract A locking device for an adjustment fitting of a vehicle seat includes a locking cam rotatable about a first rotational axis and a locking pawl rotatable about a second rotational axis. The locking device is settable into a locking position and a release position. The locking cam comprises one piece having a first locking region and a first safety region. The locking pawl has a second locking region and a second safety region. The first and second locking regions contact one another in the locking position of the device, and the first and second safety regions lie opposite one another or contact one another in the locking position. ## Claims ### Claim 1 A locking device for an adjustment fitting of a vehicle seat, the locking device comprising a locking cam rotatable about a first rotational axis relative to a fitting part of the adjustment fitting, and a locking pawl rotatable about a second rotational axis relative to the fitting part of the adjustment fitting, the locking device being settable into a locking position and a release position, the locking cam comprising one piece having a first locking region and a first safety region, non-overlapping with the first locking region, wherein the locking pawl has a second locking region and a second safety region, non-overlapping with the second locking region, the first and second locking regions contact one another at a locking angle in the locking position of the locking device, the first and second locking regions are provided on a connecting line between the first rotational axis and a third rotational axis of the fitting part while the locking device is in the locking position, and while the locking device is in the locking position, the first and second safety regions are positioned opposite one another and are separated by a gap in a normal use situation and are configured to contact one another in an accident situation; wherein the first and second locking regions and the first and second safety regions are disposed for tolerance compensation with rotation of the locking cam about the first rotational axis limited to a maximum of 20°. ### Claim 2 (depends on 1) The locking device as claimed in claim 1, wherein the locking angle is between 4° and approximately 6°. ### Claim 3 (depends on 2) The locking device as claimed in claim 2, wherein the locking angle is between 4.5° and approximately 6°. ### Claim 4 (depends on 2) The locking device as claimed in claim 2, wherein the locking angle is between 5° and approximately 6°. ### Claim 5 (depends on 2) The locking device as claimed in claim 2, wherein the locking angle is between 5.2° and approximately 5.7°. ### Claim 6 (depends on 1) The locking device as claimed in claim 1, wherein the first and second safety regions are configured to contact one another at a second locking angle between 2° and approximately 5.7°. ### Claim 7 (depends on 6) The locking device as claimed in claim 6, wherein the second locking angle is between 2° and approximately 4.5°. ### Claim 8 (depends on 1) The locking device as claimed in claim 1, wherein the first locking region and the first safety region are disposed at different radial spacings from the first rotational axis. ### Claim 9 (depends on 1) The locking device as claimed in claim 1, wherein the first locking region and the first safety region are disposed in different sectors with regard to the first rotational axis. ### Claim 10 (depends on 1) The locking device as claimed in claim 1, wherein the locking cam is spring preloaded, and prestressed into the locking position. ### Claim 11 (depends on 1) A vehicle seat having a seat part, comprising a backrest part, the adjustment fitting, and the locking device as claimed in claim 1. ### Claim 12 (depends on 1) The locking device as claimed in claim 1, wherein the first and second locking regions and the first and second safety regions are disposed for tolerance compensation with rotation of the locking cam about the first rotational axis limited to a maximum of 15°. ### Claim 13 (depends on 1) The locking device as claimed in claim 1, wherein the first and second locking regions and the first and second safety regions are disposed for tolerance compensation with rotation of the locking cam about the first rotational axis limited to a maximum of 10°.