Patent Publication Number: US-2021189762-A1

Title: Chassis retention assembly

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application claims the benefit of U.S. Provisional Patent Application No. 62/313,451 filed Mar. 25, 2016, the contents of which are incorporated herein by reference in their entirety. 
    
    
     TECHNICAL FIELD 
     The present disclosure generally relates to locksets, and more particularly, but not exclusively, relates to tubular locksets. 
     BACKGROUND 
     Tubular locksets for doors often include a latch mechanism and pair of chassis assemblies positioned on opposite sides of the latch mechanism. Certain conventional locksets of this type have certain limitations, such as those relating to ease of installation. For a tubular style lockset, the configuration of the structural and actuating interfaces between the chassis and the latch mechanism often has a large effect on the ease of the installation process. The structural interface ensures that the chassis is temporarily supported until the lockset can be secured to the door using the provided mounting screws, and the actuating interface transmits rotation of the handle to the latch mechanism. Described below are certain conventional combinations of structural and actuating interfaces. 
     The actuating interface is typically formed between the latch mechanism and a spindle of the outside chassis such that the spindle is operable to drive the latch. In certain locksets, the outside chassis includes a single drive spindle that passes through the latch mechanism and rotationally couples the outside handle to the inside handle. Other locksets utilize a “split-spindle” or “dual spindle” configuration, in which each half-spindle interfaces with the latch independently of the other, such that the outside and inside handles are rotationally decoupled. Described below are examples of conventional locksets including a single spindle actuating interface ( FIGS. 11 and 12 ) and a split spindle actuating interface ( FIG. 13 ). 
     Regarding the structural interface, the outside chassis also typically includes threaded posts for receiving the mounting screws. In certain locksets, these mounting posts are horizontally offset from one another and pass directly through the latch mechanism. In other locksets, the mounting posts are vertically offset from one another and pass around the latch mechanism, and additional material is needed to interface the outside chassis to the latch mechanism. The additional material may be provided as an extension of the chassis, or may be provided as a separate alignment component through which the chassis and the latch mechanism are indirectly engaged with one another. Described below are examples of conventional locksets including horizontally offset mounting posts ( FIG. 11 ), vertically offset mounting posts with additional material formed on the chassis ( FIG. 12 ), and vertically offset mounting posts with additional material in the form of an alignment component ( FIG. 13 ). 
     In these conventional arrangements, the interface of chassis to latch often requires design clearances to allow the mechanisms to assemble with relative ease, considering anticipated manufacturing tolerances. These clearances may prevent the latch from being able to maintain the chassis in a fixed position during the installation process. During installation, if even a slight axial force is imparted to the outside chassis via the spindle or mounting posts, the chassis assembly is prone to shift away from the door surface. In the case of split spindle configurations, the individual spindles are typically spring loaded to accommodate doors of varying thicknesses, and this spring load pushes the chassis away from the door surface. Such shifting of the outside chassis during installation can lead to an undesirable increase in installation difficulty. Further details regarding such conventional arrangements and the limitations thereof are described below with reference to  FIGS. 11-13 . In light of these and other limitations, there remains a need for further improvements in this technological field. 
     SUMMARY 
     An exemplary retention bracket is configured for use with a latch mechanism including a laterally extending housing. The retention bracket includes a first wall, a second wall, a collar, and a deformable section. The first and second walls are longitudinally offset from one another and are structured to receive the housing therebetween. The collar extends longitudinally outward from one of the first wall and the second wall, and defines an opening having an effective diameter. The deformable section has a natural state in which the effective diameter is a first diameter, and a deformed state in which the effective diameter is a second diameter greater than the first diameter. Further embodiments, forms, features, and aspects of the present application shall become apparent from the description and figures provided herewith. 
    
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
         FIG. 1  is an exploded assembly view of a lockset according to one embodiment and a door; 
         FIG. 2  is a partially-exploded perspective illustration of a portion of the lockset illustrated in  FIG. 1 ; 
         FIG. 3  is an exploded perspective illustration of a latch mechanism including a retention bracket according to one embodiment; 
         FIG. 4  is a cross-sectional illustration of a portion of the retention bracket illustrated in  FIG. 3 ; 
         FIG. 5  is an end view of the latch mechanism illustrated in  FIG. 3 ; 
         FIGS. 6 and 7  are cross-sectional illustrations of the lockset illustrated in  FIG. 1  during an installation procedure; 
         FIG. 8  is a perspective illustration of a retention mechanism according to another embodiment; 
         FIG. 9  is a perspective illustration of a retention bracket according to another embodiment; 
         FIG. 10  is a cross-sectional illustration of the retention bracket illustrated in  FIG. 9 ; and 
         FIGS. 11-13  illustrate conventional locksets. 
     
    
    
     DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS 
     For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended. Any alterations and further modifications in the described embodiments, and any further applications of the principles of the invention as described herein are contemplated as would normally occur to one skilled in the art to which the invention relates. 
     As used herein, the terms “longitudinal,” “lateral,” and “transverse” are used to denote directions defined by three mutually perpendicular axes. In the coordinate system illustrated in  FIG. 1 , the X-axis defines the longitudinal directions, the Y-axis defines the lateral directions, and the Z-axis defines the transverse directions. These terms are used for ease and convenience of description, and are without regard to the orientation of the system with respect to the environment. For example, descriptions that reference a longitudinal direction may be equally applicable to a vertical direction, a horizontal direction, or an off-axis orientation with respect to the environment. Furthermore, motion or spacing along a direction defined by one of the axes need not preclude motion or spacing along a direction defined by another of the axes. For example, elements which are described as being “laterally offset” from one another may also be offset in the longitudinal and/or transverse directions, or may be aligned in the longitudinal and/or transverse directions. The terms are therefore not to be construed as limiting the scope of the subject matter described herein. 
     With reference to  FIG. 1 , a lockset  100  according to one embodiment includes a pair of chassis assemblies  110  configured for mounting opposite sides of a door  90 , and a latch mechanism  120  positioned between and engaged with the chassis assemblies  110 . The latch mechanism  120  includes a housing  130 , a latchbolt  140  slidably mounted in the housing  130 , a retractor  150  rotatably mounted in the housing  130  and engaged with the latchbolt  140 , and a chassis retention mechanism, which in the illustrated form is provided as a chassis retention bracket  160  coupled to the housing  130 . The lockset  100  may further include a pair of handles (e.g., knobs or levers) mounted to the chassis assemblies  110  to enable a user to operate the lockset  100 . 
     In the descriptions that follow, “longitudinally outward” and “longitudinally inward” may be used to refer to longitudinal directions with respect to an origin point, such as a longitudinal center point of the assembled lockset  100 . More specifically, “longitudinally outward” is a direction away from the origin point, and “longitudinally inward” is a direction toward the origin point. In the illustrated form, the longitudinal center point of the assembled lockset  100  is defined within the retractor between two longitudinally offset arms of the retention bracket  160 . When the lockset  100  is assembled and installed on the door  90 , the longitudinally outward direction extends toward a user of the lockset  100 , and the longitudinally inward direction extends away from the user. As such, the longitudinally outward direction may alternatively be referred to as a “proximal” direction, and the longitudinally inward direction may alternatively be referred to as a “distal” direction. 
     The door  90  has an outer side  91 , an edge  92 , and an inner side  93 . The door  90  also includes a door preparation  94 , which includes a cross bore  95 , an edge bore  96 , and a recess  97 . The cross bore  95  extends longitudinally through the door  90  between the outer side  91  and the inner side  93 . The edge bore  96  extends laterally inward from the door edge  92 , and intersects the cross bore  95 . The recess  97  is formed in the door edge  92  and circumferentially surrounds the laterally outer face of the edge bore  96 . The door preparation  94  may be an industry-standard tubular door preparation in which the edge bore  96  has a nominal diameter of one inch. 
     Each chassis assembly  110  includes a housing  112 , a drive spindle  114  rotatably mounted to the housing  112 , and a spring  116  engaged with the housing  112  and the drive spindle  114 . The housing  112  is sized and configured to cover the open face of the cross bore  95 . The distal end of the drive spindle  114  includes a hub  115  structured to engage the retractor  150 . When the hub  115  is engaged with the retractor  150 , rotation of the drive spindle  114  actuates the retractor  150 , thereby laterally moving the latchbolt  140 . The drive spindle  114  is longitudinally movable with respect to the housing  112 , thereby enabling the hub  115  to engage the retractor  150  in doors having different thicknesses in the longitudinal direction. Additionally, the spring  116  is connected between the housing  112  and the drive spindle  115 , and urges the housing  112  and drive spindle  114  in opposite longitudinal directions. When the chassis  100  is connected to the latch mechanism  120 , the spring  116  urges the drive spindle  114  longitudinally inward, thereby maintaining engagement between the hub  115  and the retractor  150 . 
     One of the chassis assemblies  110  is an outside chassis  101  configured for mounting on the outer side  91  of the door  90 , and the other chassis assembly  110  is an inside chassis assembly  103  configured for mounting on the inner side  93  of the door  90 . In the illustrated form, the outside chassis  101  includes a pair of laterally spaced mounting posts  102 , and the inside chassis  103  includes a pair of laterally spaced openings  104  aligned with the posts  102 . It is also contemplated that these features may be reversed, such that the outside chassis  101  includes the openings  104  and the inside chassis  103  includes the mounting posts  102 . The chassis assemblies  110  may be coupled to one another by a pair of fasteners  106  ( FIG. 7 ) which extend through the openings  104  and engage the mounting posts  102 . 
     With additional reference to  FIG. 2 , the latch mechanism  120  includes a pair of laterally spaced openings  122  operable to receive the mounting posts  102 , and may further include a fastener, such as a rivet  124 , which couples the retention bracket  160  to the housing  130 . The latch mechanism  120  includes a stem  126  which extends laterally inward from a faceplate  127 . The stem  126  is configured to extend laterally through the edge bore  96  and into the cross bore  95 , and the faceplate  127  is configured to be received in the recess  97 . The stem  126  includes the housing  130 , the retractor  150 , and the retention bracket  160 . As described in further detail below, the latch mechanism  120  has a footprint  129  ( FIG. 5 ) defined by the stem  126 . The footprint  129  fits within the envelope of the edge bore  96 , such that the edge bore  96  is operable to receive the stem  126 . 
     With additional reference to  FIG. 3 , the housing  130  includes a case  131  and a cylindrical barrel  134 . While other forms are contemplated, the geometry of the case  131  is generally that of a parallelepiped. Two laterally spaced openings  132  extend longitudinally through the case  131  and partially define the openings  122  of the latch mechanism  120 . The case  131  also includes an aperture  135  which is positioned between the openings  122  and provides access to the retractor  150 . The case  131  may further include a slot  133  for engaging a tab of the retention bracket  160 . The barrel  134  may define a maximum outer diameter of the stem  126 , and the cross-sectional geometry of the barrel  134  may define the footprint  129  of the stem  126 . 
     The latchbolt  140  is slidably received in the barrel  134  and extends through an opening in the faceplate  127 . The latchbolt  140  is laterally movable between an extended position in which the latchbolt  140  protrudes beyond the faceplate  127 , and a retracted position in which the latchbolt  140  is at least partially retracted within the barrel  134 . Additionally, the latchbolt  140  may be biased toward the extended position. As described in further detail below, the latchbolt  140  is configured to move laterally in response to actuation of the retractor  150 . 
     The retractor  150  includes a pair of cam plates  152 , which are operably connected to the latchbolt  140  via a linkage  156 . The cam are plates  152  rotatably mounted in the case  131  and aligned with the aperture  135 . Each of the cam plates  152  includes an opening  155  sized and configured to receive the drive spindle hub  115 . The cam plates  152  are independently rotatable with respect to the case  150 , and may be biased toward a home position. The cam plates  152  are engaged with the latchbolt  140  via the linkage  156 , and the linkage  156  is structured to retract the latchbolt  140  in response to rotation of the cam plates  152  from the home position. The cam plates  152  may be independently engaged with the linkage  156  such that each cam plate  152  is operable to retract the latchbolt  140  without causing rotation of the other cam plate  152 . While the illustrated retractor  150  includes a pair of rotatable cam plates  152 , it is also contemplated that the retractor  150  may take another form. For example, a retractor may instead include one or more sliding elements which retract the latchbolt  140  in response to rotation of the drive spindle  114 . In such forms, the sliding elements may directly engage the drive spindle  114 , and the linkage  156  may be omitted. 
     The retention bracket  160  is mounted on the exterior of the case  131 , and may be secured to the housing  130  by a fastener, such as the rivet  124 . In the illustrated form, the retention bracket  160  includes a pair of laterally extending walls  161  which are positioned on opposite longitudinal sides of the case  131 . Each wall  161  includes a pair of laterally spaced openings  162  and an aperture  165  formed between the openings  162 . One or both of the walls  161  may include a slot  164  through which the retention bracket  160  is coupled to the housing  130 , for example by the rivet  124 . In certain embodiments, the retention bracket  160  may be coupled to the housing  130  at the time of manufacture, such that the latch mechanism  120  is fully assembled at the time of sale to an end user. In other embodiments, the retention bracket  160  may be provided as an add-on for an existing latch mechanism  120 . In such forms, the retention bracket  160  may be configured to engage the case  131  in another manner, such as via an interference fit, a snap fit, or another form of coupling. 
     With the retention bracket  160  mounted on the housing  130 , the bracket openings  162  are aligned with the housing openings  132 , thereby defining the latch mechanism openings  122 . Additionally, the bracket apertures  165  are aligned with the housing apertures  135  such that the retractor  150  is accessible to the drive spindle  114 . The bracket  160  may further include a plurality of laterally extending ridges  169  formed on the longitudinally inner surfaces of the walls  161 . In such embodiments, the ridges  169  may engage the case  131  in an interference or frictional fit to partially secure the bracket  160  to the housing  130 . In embodiments in which the rivet  124  or another form of permanent mechanical fastener is utilized, such engagement may partially secure the bracket  160  to the housing  130  prior to installation of the rivet  124 . In other embodiments, the interference or frictional fit may secure the bracket  160  to the housing  130  without requiring the use of additional fasteners. 
     With additional reference to  FIG. 4 , each of the openings  162  is defined by a collar  170 , such that each pair of laterally spaced openings  162  is defined by a corresponding pair of laterally offset collars  170 . In the illustrated embodiment, each pair of collars  170  extends longitudinally outward from a corresponding one of the walls  161 . Additionally, each of the illustrated collars  170  includes an inner surface  171 , a proximal entry section  172  having a primary inner diameter D 172 , an intermediate chamfered section  174 , and a distal ribbed section  176  having a reduced inner diameter D 176 . 
     In the entry section  172 , the primary inner diameter D 172  is defined by the inner surface  171 . The primary inner diameter D 172  is greater than an outer diameter D 102  of the mounting posts  102 . As such, the entry section  172  is operable to receive the mounting post  102  with a clearance fit. In other words, the mounting post  102  may be inserted into the illustrated entry section  172  without engaging or causing deformation of the bracket  160 . 
     The chamfered section  174  includes a plurality of ramps  175 , each of which projects radially inward from the inner wall  171  and extends longitudinally. The ramps  175  are angularly offset from one another with respect to a longitudinal axis of the collar  170 . The proximal ends of the ramps  175  may be flush with the inner surface  171 , and the distal ends of the ramps  175  are positioned radially inward of the inner surface  171 . The chamfered section  174  thus provides a lead-in chamfer which reduces the inner diameter of the opening  162  from the primary inner diameter D 172  to the reduced inner diameter D 176 . As described in further detail below, the lead-in chamfer provided by the chamfered section  174  aids initial engagement of the outside chassis  101  with the latch mechanism  120 , and assists in guiding and centering the mounting posts  102  for insertion through the openings  122 . 
     The ribbed section  176  includes a plurality of ribs  177 , which together form a compliant element  180  of the retention bracket  160 . Each rib  177  extends distally from the distal end of a corresponding one of the ramps  175 . The ribs  177  are angularly offset from one another with respect to a longitudinal axis of the collar  170 . Each rib  177  projects radially inward from the inner surface  171 , thereby providing the ribbed section  176  with the reduced inner diameter D 176 . The ribbed section  176  thus has a maximum inner diameter D 172  defined by the inner surface  171 , and a minimum inner diameter D 176  defined by the ribs  177 . 
     As described in further detail below, the reduced inner diameter D 176  is less than the mounting post outer diameter D 102 , such that the ribbed section  176  is operable to receive the mounting post  102  with an interference fit. More specifically, the ribs  177  provide a compliant frictional interference with the outside surface of the mounting post  102 . The developed friction resists moderate axial forces that might be applied to the outside chassis  101  during installation, including that of the spring  116 . During the installation process, the interference fit may reduce longitudinal shifting of the outside chassis  101 , thereby maintaining the chassis  101  in close proximity to or in abutment with the door surface  91 . 
     The retention force provided by the bracket  160  may be adjusted by appropriate selection of one or more design characteristics, such as the number, thickness, and radial height of the ribs  177 , the value of the reduced inner diameter D 176 , and/or the longitudinal length of the ribbed section  176 . For example, the retention force may be altered by providing the ribbed section  176  with a greater or lesser reduced inner diameter D 176 , thereby altering the amount of radial interference between the ribbed section  176  and the post  102 . Additionally or alternatively, the retention force may be altered by providing the ribbed section  176  with a greater or lesser longitudinal length, thereby altering the longitudinal length of the interference fit. In certain embodiments, the retention bracket  160  may further include mechanical snaps operable to supplement the axial force resistance provided by the frictional interference fit. 
     The retention force provided by the bracket  160  may also be adjusted by appropriate selection of one or more manufacturing options, such as the material of which the mounting bracket  160  is formed and/or the manufacturing process by which the bracket  160  is produced. The retention bracket  160  may be made from any number of compliant materials and associated manufacturing processes, so long as an adequate retention force is developed. In certain forms, the bracket  160  may be formed of a different material than the housing  130 . For example, the housing  130  may be formed of a material that is not conducive to a compliant interference fit, such as unhardened low-carbon steel, and the retention bracket  160  may be formed of a material that is more compliant and/or less rigid than the material of the housing  130 . 
     In the illustrated retention bracket  160 , each pair of collars  170  is formed on a corresponding one of the sidewalls  161 , and the sidewalls  161  are connected by an end wall  167 . In an alternative form of retention mechanism, the walls  161  need not be directly connected to one another, and may be individually mounted on opposite sides of the case  131 . In other embodiments, a chassis retention mechanism may include a single wall  161  mounted on the side of the case  131  that faces the outside chassis  101 . In further embodiments, a chassis retention mechanism need not include the walls  161 , and one or more of the collars  170  may be individually mounted to the case  131 . 
     With additional reference to  FIG. 5 , illustrated therein is an end view of the latch mechanism  120  along with a representation of the edge bore  96 . As indicated above, the latch mechanism  120  has a footprint  129  that is defined by the stem  126 . The footprint  129  of the latch mechanism  120  may be defined as the largest geometry that the stem  126  occupies in the longitudinal-transverse (X-Z) plane. In other words, the footprint  129  is a cross-section of the latch mechanism  120  in a plane perpendicular to the lateral axis (Y). As such, the footprint  129  may alternatively be referred to as a lateral footprint or lateral cross-section. In the illustrated form, the largest geometry of the stem  126  is provided by the barrel  134 , such that a footprint  135  of the barrel  134  defines the footprint  129  of the stem  126 . In other forms, the stem footprint  129  may be defined by additional or alternative features of the stem  126 . Additionally, while the illustrated stem footprint  129  is defined by a single portion of the stem  126 , it is also contemplated that the footprint  129  may be defined by two or more portions of the stem  126  that are laterally offset from one another. 
     In order for stem  126  to be received in the edge bore  96  without interference, the footprint  129  may need to be capable of fitting within the envelope defined by the edge bore  96 . Accordingly, the footprint  129  may be sized to fit within the envelope or lateral cross-section of the edge bore  96 . In the illustrated embodiment, the retention bracket  160  fits entirely within the barrel footprint  135 , and therefore does not expand the footprint  129  of the latch mechanism  120 . Due to the fact that the retention bracket  160  does not alter the footprint  129 , the assembled latch mechanism  120 , including the retention bracket  160 , fits within the envelope of the standard edge bore  96 . As a result, the retention bracket  160  can be fixedly mounted to the housing  130  prior to installation of the lockset  100  on the door  90 , and the assembled latch mechanism  120  may be included in the lockset  100  at the time of sale to an end user. In the illustrated form, the envelope of the edge bore  96  is defined by a circle having a diameter of one inch, and the footprint  129  fits within the circle. Thus, the stem  126  of the latch mechanism  120 , including the retention bracket  160 , is configured to be received in a standard edge bore  96  having a one-inch diameter. 
     In the illustrated form, the retention bracket  160  fits entirely within the existing footprint  129  of the stem  126 . It is also contemplated that the retention bracket  160  may fit substantially entirely within the existing stem footprint  129 . The term “substantially” as used herein may be applied to modify a quantitative representation which could permissibly vary without resulting in a change in the basic function to which it is related. For example, the retention bracket  160  could permissibly protrude beyond the footprint  129  by a small amount, for example as a result of tolerances in the manufacturing and/or assembly of the latch mechanism  120 . In such cases, the retention bracket  160  may nonetheless be considered to fit substantially entirely within the footprint  129  so long as the incongruity does not materially alter the ability of the stem  126  to be inserted into the edge bore  96 . In further forms, the retention bracket  160  itself may define the footprint  129  of the stem  126 . In such forms, the retention bracket  160  may define the footprint  129  to fit within a circle having a diameter of one inch such that the assembled latch mechanism is sized and configured to be received in the one-inch diameter edge bore  96 . 
     During installation of the lockset  100  on the door  90 , the assembled latch mechanism  120  is mounted in the door preparation  94 . More specifically, the laterally inner portion of the stem  126 , which includes the case  131  and the retention bracket  160 , is inserted into the edge bore  96 . The latch mechanism  120  is then urged laterally inward such that the case  131  and retention bracket  160  enter the cross bore  95 , the barrel  134  enters the edge bore  96 , and the faceplate  127  enters the recess  97 . With the faceplate  127  received in the recess  97 , the openings  122  of the latch mechanism  120  are substantially parallel to the longitudinal axis defined by the cross bore  94 . The outside chassis  101  may then be attached to the latch mechanism  120 . 
     With additional reference to  FIG. 6 , attaching the outside chassis  101  to the latch mechanism  120  includes inserting the distal ends of the mounting posts  102  into the retention bracket openings  162 . As noted above, each of the openings  162  is defined in part by the entry section  172 , which has an inner diameter D 172  greater than the outer diameter D 102  of the posts  102 . As a result, of the disparity in diameters, insertion of the mounting posts  102  into the openings  162  is facilitated. With the posts  102  received in the entry sections  172 , the outside chassis  101  is urged longitudinally inward such that the posts  102  enter the chamfered sections  174  and engage the ramps  175 . As the posts  102  travel through the chamfered sections  174 , the ramps  175  engage the posts  102  and urge the posts  102  and the openings  162  into alignment. 
     As will be appreciated, the effective diameter of the openings  162  corresponds to the diameter D 176  of the ribbed section  176 . Prior to insertion of the mounting posts  102 , the ribs  177  of the compliant element  180  may be in an undeformed or natural state, in which the effective diameter or ribbed section diameter D 176  is a first diameter. As the posts  102  enter the ribbed sections  176 , the posts  102  engage and deform the ribs  177  of the compliant element  180 . As a result, the compliant element  180  is transitioned to a deformed state, and the effective diameter or ribbed section diameter D 176  increases to a second diameter. As a result of the deformed state, the ribs  177  a frictional interference fit is formed between each post  102  and corresponding ribbed section  176 . 
     As the outside chassis  101  continues to be urged toward the inner side  93  of the door  90 , the drive spindle hub  115  enters the opening  155  of the outside cam plate  152 , and the housing  120  comes into contact with the door outer surface  91 . In this state, the drive spindle  114  is engaged with the retractor  150 . With the latch mechanism  120  longitudinally anchored to the door  90 , the spring  116  urges the outside chassis  101  longitudinally outward. The frictional interference fit formed between the posts  102  and the retention bracket  160  is operable to generate a resistive force greater than the force generated by the spring  116 . The interference fit counters the longitudinally outward force of the spring  116 , thereby retaining the housing  120  in close proximity or abutment with the door outer surface  91 . As a result, the position of the partially installed lockset  100  is maintained, enabling the installer to use both hands when installing the inside chassis  103 . 
     With additional reference to  FIG. 7 , installing the inside chassis  103  includes placing the housing  120  against the door inside surface  93  such that the openings  104  are aligned with the mounting posts  102  and the drive spindle hub  115  is engaged with the inside cam plate  152  of the retractor  150 . Fasteners may then be inserted into the mounting posts  102  through the openings  104 . For example, a pair of screws  106  may be screwed into the posts  102  through the openings  104  to secure the inside chassis  103  to the outside chassis  101 . With the chassis assemblies  110  secured to one another and engaged with the latch mechanism  120 , the lockset  100  is mounted on the door  90 . A rose plate may be mounted on the housing  120  of the inside chassis  103  to cover the screws  106 , and a handle may be mounted on each of the chassis assemblies  110  to complete the installation procedure. 
     With the lockset  100  assembled, the hub  115  of each drive spindle  114  is received in the opening  155  of the corresponding cam plate  152 . As noted above, the cam plates  152  are rotatable with respect to one another and are operable to independently engage the linkage  156 . As a result, each drive spindle  114  is independently operable to retract the latchbolt  140 , thereby enabling the lockset  100  to provide the benefit of independently operable handles. 
       FIG. 8  illustrates a retention mechanism  260  according to another embodiment. The retention mechanism  260  is substantially similar to the retention mechanism  160  described above. Unless stated otherwise, similar reference characters are used to indicate similar elements and features. For example, the retention mechanism  260  includes a pair of walls  261  extending laterally from an end piece  267 , a plurality of collars  270  extending longitudinally from the walls  261 , and a plurality of openings  262  defined by the collars  270 . In the interest of conciseness, the following description of the retention mechanism  260  focuses primarily on features that are different from those described above with reference to the retention mechanism  160 . 
     In the instant embodiment, the frictional interference fit is not provided by ribs, but is instead provided by a compliant element in the form of a living hinge  280 . More specifically, a slot  282  extends laterally from the end piece  267  through one of the collars  270  on each side of the retention mechanism  260 . As a result, one of the collars  270  on each side is defined as a split collar  290  having an upper lip  292  and a lower lip  294 . With the living hinge  280  in its natural or undeformed state, the split collar  290  has an effective inner diameter D 290  less than the outer diameter D 102  of the mounting post  102 . When the mounting post  102  enters the split collar  290  during installation, the living hinge  280  flexes as the mounting post  102  urges the upper and lower lips  292 ,  294  apart from one another, thereby transitioning the living hinge  280  to a deformed state in which the effective inner diameter D 290  corresponds to the outer diameter D 102  of the mounting posts. In the deformed state, the living hinge  280  urges the upper and lower lips  292 ,  294  toward each other, thereby forming a frictional interference fit between the split collar  290  and the mounting post  102 . 
       FIGS. 9 and 10  illustrate a retention mechanism  360  according to another embodiment. The retention mechanism  360  is substantially similar to the retention brackets  160 ,  260  described above. Unless stated otherwise, similar reference characters are used to indicate similar elements and features. For example, the retention mechanism  360  includes a pair of walls  361  extending laterally from an end piece  367 , a plurality of collars  370  extending longitudinally from the walls  361 , and a plurality of openings  362  defined by the collars  370 . In the interest of conciseness, the following description of the retention mechanism  360  focuses primarily on features that are different from those described above with reference to the retention mechanisms  160 ,  260 . 
     In the illustrated bracket  360 , each sidewall  361  has a single collar  370  extending longitudinally outward therefrom, and the compliant element is provided as a convex rib  380  that extends longitudinally along the opening  362 . The rib  380  includes a pair of ramped portions  375 , each of which extends longitudinally outward from body portion  376  of the rib  380 . The opening  362  has a first effective diameter D 372  at the entryway of the collars  370 , and a second effective diameter D 376  defined in part by the body portion  376 . The ramped portions  376  cause the effective diameter of the opening  362  to transition from the first effective diameter D 372  to the second effective diameter D 376  in a manner analogous to that described above with reference to the ramps  175  of the compliant element  180 . The rib  380  may have a longitudinally-extending concavity  388  which guides the mounting post  102  as the post  102  is inserted into the opening  362 . 
     In the illustrated embodiment, each laterally-extending sidewall  361  of the bracket  360  includes a tab  363  that extends longitudinally inward toward the other sidewall  361 , and the end wall  367  includes at least one rib  369 . While other forms are contemplated, in the illustrated embodiment, the end wall  367  includes a pair of transversely-extending ribs  369 . With the bracket  360  mounted to the case  131 , each of the tabs  363  is received in a corresponding one of the slots  133 , and the ribs  369  engage the end of the case  131  such that the tabs  363  cooperate with the ribs  369  to snugly engage the bracket  360  to the case  131 . The bracket  360  may be formed of a compliant material in order to enable the tabs  363  and ribs  369  to deflect or otherwise deform during installation of the bracket  360 , and such deflection or deformation may aid in maintaining the position of the bracket  360  relative to the case  131 . 
       FIGS. 11-13  illustrate locksets including conventional forms of structural and actuating interfaces. In the locksets illustrated in  FIGS. 11-13 , similar reference characters are used to indicate similar elements and features. 
     With reference to  FIG. 11 , a first conventional lockset  410  includes a structural interface including horizontally offset mounting posts  414  and an actuating interface including a single drive spindle  418 . The lockset  410  also includes a chassis  412  and a latch mechanism  416 . The mounting posts  414  are horizontally offset from one another and extend through a casing of the latch mechanism  416 , thereby defining the structural interface. The single drive spindle  418  passes through a retractor of the latch mechanism  416 , thereby defining the actuating interface. The single drive spindle  418  and both mounting posts  414  pass directly through the latch mechanism  416  with clearance fits, which are dictated by manufacturing tolerances. As a result of the clearance fits, the latch mechanism  416  is unable to counteract axial loads on the chassis assembly  412 . Therefore, if an axial force were imparted to either the spindle  418  or the posts  414 , such a force would tend to push the chassis assembly  412  away from the door and to a position that has reduced engagement with the latch mechanism  416 . As such, this arrangement may result in reduced ease and/or efficiency of the installation process as compared with the installation of the above-described lockset  100 . 
     With reference to  FIG. 12 , a second conventional lockset  420  includes an actuating interface including a single spindle  428  similar to that described above with reference to the lockset  410 . In the lockset  420 , however, the mounting posts  424  are vertically offset from one another, and do not directly engage the latch mechanism  426 . As a result, this configuration requires extra material  429  on the chassis  422  in order to provide the necessary interface between the chassis  422  and the latch mechanism  426 . When compared with the above-described lockset  100 , this configuration may provide reduced orientation accuracy and reduced support for the mass of the chassis  422 . Like the modification illustrated in  FIG. 8 , this arrangement is also susceptible to shifting from an imparted axial force. 
     With reference to  FIG. 13 , a third conventional lockset  430  includes an actuating interface including a split spindle  434  which is urged into engagement with the latch mechanism  436  by a spring  435 . The lockset  430  also includes a pair of vertically offset mounting posts  434  which do not directly engage the latch mechanism  436 . As a result, this configuration requires extra material in the form of an alignment component  439 , which receives the posts  434  and provides an intermediate interface between the outside chassis  432  and the latch mechanism  436 . While this arrangement retains the benefit of offering independently operable handles, installation difficulty is increased for two reasons. First, the outside chassis  432  is continually urged away from the door surface due to the axial force from the spring  435 . Second, the alignment component  439  extends beyond the footprint of the latch mechanism  436 , and therefore does not fit through the edge bore  96 . Thus, in order to interface the latch mechanism  436  with the alignment component  439 , the alignment component  439  must be inserted into the cross bore  95  and manually held in the proper position while the latch mechanism  436  is inserted into the alignment component  439  via the edge bore  96 . These difficulties may result in reduced ease and/or efficiency of the installation process as compared with the installation of the above-described lockset  100 . 
     One aspect of the present disclosure relates to a method of installing a lockset on a door having a lateral edge bore and a longitudinal cross-bore connected with the edge bore, wherein the lockset includes a first chassis and a latchbolt mechanism, wherein the first chassis includes a first mounting post, wherein the latch mechanism includes a latch housing and a retention mechanism coupled to the latch housing, and wherein the retention mechanism includes a first opening and at least one first rib extending into the first opening. The method comprises mounting the latch mechanism on the door, wherein mounting the latch mechanism includes inserting the latch housing and the coupled retention mechanism into the edge bore such that the housing extends into the cross-bore and the first opening of the retention mechanism is positioned in the cross-bore; and mounting the first chassis on the door, wherein mounting the first chassis includes inserting the first mounting post into the first opening and deforming the at least one first rib to form a first frictional interference fit between the first chassis and the latch mechanism. 
     In a refinement, the first chassis further comprises a first chassis housing, the first mounting post extends longitudinally from the first chassis housing, and mounting the first chassis further includes urging the first chassis housing into abutment with a first surface of the door. In another refinement, the first chassis further includes a second mounting post, the retention mechanism further includes a second opening and at least one second rib extending into the second opening, and mounting the first chassis further includes inserting second mounting post into the second opening and deforming the at least one second rib to form a second frictional interference fit between the first chassis and the latch mechanism. In a further refinement, the first chassis further includes a drive spindle and a spring, and the latch mechanism further comprises a retractor connected to the latchbolt, the drive spindle is rotatably and slidably mounted to the chassis housing and the spring urges a distal end of the drive spindle away from the chassis housing, mounting the first chassis further includes engaging the distal end of the drive spindle with the retractor and deforming the spring, the spring urging the chassis housing away from the latch mechanism with a proximal biasing force, and the first frictional interference fit resists the proximal biasing force and retains position of the first chassis. 
     While the invention has been illustrated and described in detail in the drawings and foregoing description, the same is to be considered as illustrative and not restrictive in character, it being understood that only the preferred embodiments have been shown and described and that all changes and modifications that come within the spirit of the inventions are desired to be protected. 
     It should be understood that while the use of words such as preferable, preferably, preferred or more preferred utilized in the description above indicate that the feature so described may be more desirable, it nonetheless may not be necessary and embodiments lacking the same may be contemplated as within the scope of the invention, the scope being defined by the claims that follow. In reading the claims, it is intended that when words such as “a,” “an,” “at least one,” or “at least one portion” are used there is no intention to limit the claim to only one item unless specifically stated to the contrary in the claim. When the language “at least a portion” and/or “a portion” is used the item can include a portion and/or the entire item unless specifically stated to the contrary.