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A key lock tumbler cylinder is selectively removed with an extraction key that is longer than a normal operating key. The last tumbler plate in a tabular cylinder series along the cylinder key slot projects into an arcuate channel in the cylinder cavity wall of the lock body. This arcuate channel do

A key lock tumbler cylinder is selectively removed with an extraction key that is longer than a normal operating key. The last tumbler plate in a tabular cylinder series along the cylinder key slot projects into an arcuate channel in the cylinder cavity wall of the lock body. This arcuate channel does not junction with the lock tumbler plate channel but does intersect with a second channel in the cavity wall that is angularly displaced about the cylinder axis from the tumbler plate channel. However, the second channel is more shallow than the arcuate channel to confine the tumbler cylinder within the body cavity when rotated by the operating key which does not engage the last tumbler plate key aperture. A second, tumbler cylinder extraction key that is longer than the operating key includes an edge bit at the end of the key for cooperating with the last tumbler plate key aperture. This end of the extraction key withdraws the last tumbler plate from the arcuate channel sufficiently to allow a tabular extension from the last tumbler plate blade to align with the second channel when the tumbler cylinder is rotated about the cylinder axis from the tumbler plate channel penetration position. In such a rotated position with the cylindrical extraction key, the tumbler cylinder may be extracted from the body cavity.

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[ We claim:] [1.] A key operated cylinder lock assembly comprising a body member, a tumbler cylinder member and a latch member, said body member including a substantially cylindrical cavity within a cylindrical wall formed about a cylinder axis, said cylindrical wall having a pair of spline channels

[ We claim:] [1.] A key operated cylinder lock assembly comprising a body member, a tumbler cylinder member and a latch member, said body member including a substantially cylindrical cavity within a cylindrical wall formed about a cylinder axis, said cylindrical wall having a pair of spline channels therein extending substantially parallel with said cylinder axis, said tumbler cylinder member comprising a plug having a substantially cylindrical surface configured and dimensioned to fit axially and rotatively within said cavity, said tumbler cylinder further comprising a key receptacle slot therein extended along an axial length, said slot being aligned substantially diametrically within said plug and a plurality of substantially parallel plane tumbler plates distributed along the axial length of said slot, said tumbler plates having a tongue element with a tongue width that is oriented substantially transversely to the slot length and confined in respective guide slots, each tumbler plate being slidably disposed within its respective guide slot and resiliently biased toward one radial edge of said key receptacle slot for projection of said tongue element beyond the cylindrical surface of said plug and into a first of said spline channels in said cylindrical wall, said first spline channel having a width corresponding to said tongue width to prevent rotation of said tumbler cylinder about said cylinder axis, each of said tumbler plates also having a key aperture therein aligned to receive an operating key therethrough for withdrawing said tongue elements from said first spline channel thereby permitting said latch member to be operated by rotation of said tumbler cylinder about said cylinder axis, at least one of said tumbler plates having a tabular extension from said tongue element with a width substantially less than said tongue width, a second of said cylindrical wall spline channels having width corresponding to the width of said tabular extension, an arcuate channel in said cylindrical wall in planar alignment with said one tumbler plate to rotatively pass said tabular extension through said arcuate channel for a partial circle of rotation when the remainder of said plurality of tumbler plates are withdrawn from said first spline channel by insertion of said operating key through said apertures but preventing axial withdrawal of said tumbler cylinder from said cavity, said first spline channel having no open junction with said arcuate channel and said second spline channel having an open junction with said arcuate channel.