US 4,763,934 AGranted

Door latch and lock assembly

AssigneeCaterpillar Inc.

InventorJohn R. Kaveney, Jr.

Life of this patent

Estimating the term…

Loading patent…

Abstract

Door lock and lock assemblies are useful, for example, in vehicle cabs. Latch and lock assemblies of known structures which can be unlocked from inside the cab while remaining locked from outside the cab require complex and bulky linkage assemblies. The subject door latch and lock assembly includes pivotal outer and inner actuator. The pivotal movement of the outer actuator simultaneously pivots the inner actuator to open a catch mechanism. Pivot movement of the inner actuator can be independent of the outer actuator. A locking lever can be pivoted to a locked position to prevent pivotal movement of the outer actuator. Pivotal movement of the inner actuator is not prevented by the locking lever. Thus, the disclosed door latch and lock assembly can be opened from inside the cab while remaining locked from outside the cab without requiring complex and bulky linkage assemblies.

Claims3

Dependent claims

A door latch and lock assembly adapted to be connected, in use, to a door to permit the door to be releasably latched to a frame having a striker thereon, the door latch and lock assembly comprising:

a support structure connectable to the door;
a catch mechanism connected to support structure and actuatable to a closed condition for latching engagement with the striker and an open condition for disengagement from the striker;
an inner actuator mounted on the support structure for pivotal movement about a central axis;
means for connecting the inner actuator to the catch mechanism;
an outer actuator mounted on the support structure for pivotal movement about the central axis;
means for causing simultaneous pivotal movement of the inner actuator when the outer actuator is pivoted and allowing pivotal movement of the inner actuator independent of the outer actuator, said pivotal means includes a lug on the outer actuator projecting laterally toward the inner actuator and a lug on the inner actuator projecting laterally toward the outer actuator and being positioned for abutment with each other;
and
a key lock assembly connectable to the door, said key lock assembly having a locking lever movable between a locked position for preventing pivotal movement of the outer actuator and an unlocked position allowing pivotal movement of the actuator, wherein said locking lever, when in the locked position, remains in the locked position during pivotal movement of the inner actuator.

5 more elements

Dependencies are inferred from the claim text.