Window lock with automatic latch retention mechanism and associated method

A window lock for securing a first frame member of a window to a keeper structure attached to a second frame member of the window and thereby preventing a relative adjustment of the first and second window frame members in a first direction of motion, the lock comprising:

• a housing configured to be secured to the first window frame member and defining an internal space;
• a latch member slidably mounted in the housing and configured to be slidably adjusted in alternate rearward and forward directions between a retracted position and an extended position, the latch member in the extended position configured to extend in the forward direction from the housing to engage the keeper structure, and the latch member in the retracted position configured to retract in the rearward direction at least partially into the housing to disengage the keeper structure;
• a rotatable handle defining a shaft, the shaft extending through the housing and configured to actuate the latch member, wherein the handle is rotatably adjustable about an axis generally defined by the shaft, wherein the handle is rotatable from a locked position to an unlocked position to adjust the latch member to the retracted position, the handle in the unlocked position extending generally away from the window frame members in the rearward direction to indicate that the latch member is retracted;
• and
• a retention mechanism comprising:
• a rotatable disk mounted in the internal space of the housing and connected to the shaft of the handle, such that the disk is configured to rotate with the shaft and the handle about the axis generally defined by the shaft of the handle;
• a rocker arm defining a shaft portion extending perpendicular to the handle shaft and a hook portion, the rocker arm being configured to rotate about the shaft portion such that the rocker arm is adjusted between an engaged position and a disengaged position, the hook portion in the engaged position being engaged with the disk to prevent the disk from rotating and thereby holds the latch member in the retracted position, and the hook portion in the disengaged position being disengaged from the disk so that the disk is configured to rotate and the latch member is configured to be adjusted to the extended position, wherein the rocker arm is configured to automatically engage the disk to prevent the disk from rotating and prevent the latch member from moving to the extended position when the window frame members are relatively adjusted in an open configuration;
• a trigger member configured to rotate between an extended position and a retracted position, the trigger member in the extended position extending from the housing and the trigger member in the retracted position being retracted at least partially into the housing such that the trigger member is configured to contact the keeper structure and be adjusted to the retracted position by the keeper structure when the window frame members are relatively adjusted to a closed configuration and the lock is thereby adjusted to a position proximate the keeper structure, the trigger member being configured to engage the rocker arm to adjust the rocker arm to the disengaged position when the trigger member is adjusted to the retracted position, such that the rocker arm disengages the disk and the latch member is automatically adjusted to the extended position and the handle is adjusted to the locked position when the window frame members are adjusted to the closed configuration and the lock is adjusted to a position proximate the keeper structure;
• and
• at least one biasing member configured to bias the latch member to the extended position and the rocker arm to the engaged position.

A method for securing a lock attached to a first frame member of a window to a keeper structure attached to a second frame member of the window and thereby preventing a relative adjustment of the first and second window frame members in a first direction of motion, the method comprising:

• providing a housing secured to the first frame member of the window;
• providing a handle extending from the housing, wherein the handle is defined by a shaft and a grip portion, the shaft extending through the housing and configured to actuate a latch member, and the grip portion defining an end distal to the shaft;
• rotating the handle about an axis generally defined by the shaft between a locked position and an unlocked position, wherein rotating the handle thereby rotates a disk mounted in the housing and connected to the shaft of the handle and configured to rotate with the shaft and the handle about the axis generally defined by the shaft of the handle, wherein rotating the disk thereby slidingly retracts the latch member from an extended position in the keeper structure to a retracted position at least partially into the housing;
• relatively adjusting the window frame members from a closed configuration to an open configuration such that the lock is moved from the proximity of the keeper structure, while the latch member is automatically retained in the retracted position by a retention mechanism;
• thereafter, relatively adjusting the window frame members from the open configuration to the closed configuration such that the lock is moved proximate the keeper structure, the retention mechanism releases the latch member, and the latch member is automatically adjusted to the extended position to lock the window, wherein the step of automatically retaining the latch member includes rotating the rocker arm about an axis perpendicular to the handle shaft so that a hook portion engages the disk to prevent the disk from rotating and thereby holds the latch member in the retracted position, and wherein the step of adjusting the window frame members to the closed configuration comprises contacting a trigger member with the keeper structure such that the trigger member rotates at least partially into the housing to engage the rocker arm and adjust the rocker arm to disengage the rocker arm from the disk.