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A door latch includes pan or attachment to a flat surface of a door adjacent a door frame; an actuation subassembly which includes a handle on one side of the pan, a turn cam on an opposite side of the pan and a handle shaft which connects the handle with the turn cam through a hole in the pan, the

A door latch includes pan or attachment to a flat surface of a door adjacent a door frame; an actuation subassembly which includes a handle on one side of the pan, a turn cam on an opposite side of the pan and a handle shaft which connects the handle with the turn cam through a hole in the pan, the turn cam including two rectilinear members extending in parallel with the handle shaft and away from the pan; and a latch subassembly which includes a latch element having a latch body with holes therein through which the rectilinear members extend and a latch arm, and an adjustment member to which the latch element is rotatably attached, the adjustment member moving the latch element toward and away from the pan and to adjust its positioning relative to the pan.

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1. A door latch having a depth-adjustable latch element which comprises:a pan which is attachable to a flat surface adjacent a doorway, said pan defining a pan hole therein,an actuation subassembly which includes a handle on one side of said pan and a handle shaft that extends through said pan hole,

1. A door latch having a depth-adjustable latch element which comprises:a pan which is attachable to a flat surface adjacent a doorway, said pan defining a pan hole therein,an actuation subassembly which includes a handle on one side of said pan and a handle shaft that extends through said pan hole, anda latch subassembly which includes a bracket defining a latch bracket hole aligned with said pan hole, an elongated adjustment member which is spaced away from said handle shaft and extends through said latch bracket hole so as to be collinear with said handle shaft, said adjustment member being movable toward and away from said handle shaft and said pan, and a rotatable latch element mounted on said adjustment member so as to be movable with said adjustment member towards and away from said pan,rotation of said handle shaft by said handle causing rotation of said latch element between a latched positioning and an unlatched positioning relative to said doorway.2. A door latch according to claim 1, wherein said actuation subassembly includes a turn cam connected to said handle shaft on a side of said pan opposite said handle, rotation of said turn cam causing rotation of said latch element.3. Door latch according to claim 2, wherein said elongated adjustment member comprises a threaded bolt.4. A door latch according to claim 3, including an internally threaded guide element attached to said bracket and through which said threaded bolt extends.5. A door latch according to claim 4, including lock means to fixedly position said threaded bolt relative to said guide element.6. A door latch according to claim 5, wherein said lock means comprises a lock nut.7. A door latch according to claim 3, wherein said threaded bolt includes means at an end thereof opposite said pan to facilitate manual rotation thereof.8. A door latch according to claim 7, wherein said means comprises a configured blind bore therein for positioning of an Allen wrench.9. A door latch according to claim 2, wherein said latch element includes a latch body and a latch arm, said latch body having a center hole therein for positioning around said adjustment member and a turn hole, and wherein said turn cam includes a rectilinear member which can freely extend through said turn hole to rotate said latch element about said center hole.10. A door latch according to claim 9, including a plurality of turn holes in said latch body positioned in a circular arc around said center hole.11. A door latch according to claim 10, wherein said turn cam includes a flat head and two rectilinear members which extend from said flat head in a direction opposite to said pan and through respective turn holes in said latch body.12. A door latch according to claim 11, wherein said rectilinear members comprise cylindrical rods.13. A door latch according to claim 11, wherein said head defines a first edge portion which extends along a first circular arc, and a second edge portion which extends along a second circular arc; a radius of said second circular arc being smaller than a radius of said first circular arc to define first and second abutment surfaces therebetween.14. A door latch according to claim 13, wherein said second edge portion includes a cutout adjacent said second abutment surface.15. A door latch according to claim 14, including a locking subassembly which includes a slide bar which can slide toward and away from said head of said turn cam and which defines a projection at one end thereof that can fit within said cutout in said second edge portion of said head to prevent rotation thereof and lock said latch element in a latched positioning.16. A door latch according to claim 15, wherein said locking subassembly includes a lock bracket which is positioned between said latch bracket of said latch subassembly and said pan and which defines a slide channel in which said slide bar slides.17. A door latch according to claim 16, wherein said pan includes a slot therein and said locking subassembly includes a key-operated cylinder lock which extends through said slot and includes a rotatable cylinder having an offset lug that can move said slide bar away from said cutout in said turn cam.18. A door latch according to claim 17, wherein said slide bar includes a T-slot therein, wherein said bracket of said locking subassembly includes a detent that fits within a base channel of said T-slot, and including a spring positioned between said detent and a bottom said base channel to bias said slide bar towards said second edge portion of said head.19. A door latch according to claim 18, wherein said offset lug of said cylinder lock extends in a cross channel of said T-slot.20. A door latch according to claim 9, wherein said latch body includes a peripheral edge providing first and second abutment surfaces that can contact said latch bracket when said latch element is respectively in said latched positioning and unlatched positioning.