Closure fasteners – Rollback and spindle connection
Reexamination Certificate
2001-02-23
2003-04-01
Sandy, Robert J. (Department: 3677)
Closure fasteners
Rollback and spindle connection
C292SDIG005, C292SDIG006, C292S169230, C292S336300, C070S472000
Reexamination Certificate
active
06540274
ABSTRACT:
TECHNICAL FIELD
This invention relates generally to lock assemblies used to secure doors. More particularly, the present invention relates to a slide component developed for a hybrid lock architecture designed to incorporate the functionality of a cylindrical lock architecture with the ease of installation of a tubular lock architecture.
BACKGROUND OF THE INVENTION
There are currently two main types of lock architectures in widespread use today. These lock architectures are typically known as the cylindrical lock and the tubular lock designs. Each of these designs has advantages and disadvantages in comparison to the other.
While there are variations, traditionally, a cylindrical lock consists of a chassis, an inside mounting plate, an outside mounting plate and rose, an inside rose, a fixed backset latch, an inside and outside knob/lever, and mounting screws. The fundamental workings of the cylindrical lock provide the conversion of rotational motion of the knob/lever to linear motion—within the chassis housing—to retract the latch. The typical cylindrical lock architecture uses a drawbar occupying the axis of the latch bore. The cylindrical lock architecture typically is more expensive to manufacture, but allows more functional variations than a tubular lock and generally provides better security. The chassis has a fixed spindle-end to spindle-end length which easily accommodates a push-button locking mechanism, however this also results in a varying distance from the end of the knob/lever to the surface of the door when used with different door thicknesses. Installation of a cylindrical lock is generally more complicated than that of a tubular lock. During installation of the cylindrical lock, the inside knob/lever, rose, and mounting plate need to be removed. The chassis needs to be centered in the door by adjusting the outside rose. Additionally, the design constraints inherent in the cylindrical architecture make it impossible to have a dual backset latch which does not require some type of adjustment. Where available, these adjustable backsets used in cylindrical locks are failure-prone and inferior to fixed backset latches.
A tubular lock architecture traditionally consists of an inside chassis complete with a rose and a knob/lever attached, an outside chassis also complete with a rose and a knob/lever attached, a latch, and mounting screws. This simple design allows for easy and quick installation of the tubular lock design with virtually no adjustment required. Due to its simplicity, the tubular architecture also provides a cost advantage over the cylindrical lock. The tubular lock design also provides a fixed distance from the surface of the door to the end of the lever even when used with different door thicknesses. The tubular lock architecture converts rotational motion of the knob/lever to linear motion within the latch in order to retract the latch. Accordingly, a drawbar occupies the axis of the latch bore. However, due to the edge bore of a door preparation, the amount of latch retraction is restricted. Other problems are found in that design constraints make it impossible to design a consistently functioning push button lock because of the chassis datum on the surface of the door. Since the door thickness variation is considerably greater than the push button linear travel, no direct means are available to provide a secure consistent locking action. The tubular lock architecture is also generally less secure than a cylindrical lock architecture.
Accordingly, there remains a need in the art for a lock architecture which combines the advantages of both the tubular lock architecture and the cylindrical lock architecture along with other advantages, while minimizing or removing the limitations existing in each of the prior art designs. Accordingly, a suitable alternative is provided including features more fully disclosed hereinafter.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a slide component for a new lock architecture configuration designed to incorporate the functionality of a cylindrical lock architecture with the ease of installation of a tubular lock architecture. These and other improvements are provided by a slide component comprising a U-shaped body portion. The slide also incorporates a plurality of independent retractors and at least one pair of retaining members, positioned near an open end of the U-shaped body for attachment of a drawbar of a door latch assembly of the lock assembly.
It is a further object of the present invention to provide a new lock architecture configuration utilizing the slide member which is designed to incorporate the functionality of a cylindrical lock architecture with the ease of installation of a tubular lock architecture. These and other improvements are provided by a lock assembly for a door comprising a chassis assembly mounted in a bore of the door and a door latch assembly operably connected to a slide member of the chassis assembly for retraction and extension of a bolt. A handle is mounted on a spindle on either side of the chassis assembly. Rotational motion imparted on one of the handles is converted to linear motion within the chassis assembly at the slide interface in order to retract the bolt of the door latch assembly.
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Bates Peter K.
Hendrickson Thor
Pompeii Dario L.
Melwani Dinesh
Michael & Best & Friedrich LLP
Sandy Robert J.
Schlage Lock Company
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