Patent Publication Number: US-2019169885-A1

Title: Vehicle door lock device

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is based on and claims priority under 35 U.S.C. § 119 to Japanese Patent Application 2017-234534, filed on Dec. 6, 2017, the entire contents of which are incorporated herein by reference. 
     TECHNICAL FIELD 
     The disclosure relates to a vehicle door lock device. 
     BACKGROUND DISCUSSION 
     Generally, a vehicle door lock device is provided with a latch mechanism which is engaged with a striker provided on a vehicle body. In addition, a door moved to a fully closed position is bound to the vehicle body while being in an unmovable state based on an engagement force of the latch mechanism, for example (for example, refer to JP 2016-108777A). 
     For example, as illustrated in  FIG. 9 , a door  71  that is configured as a slide door  70  moving in a vehicle front-rear direction (lateral direction in  FIG. 9 ) is provided with an outer panel  72  that forms an outer surface  71   s  and an inner panel  73  that is positioned inward of (in  FIG. 9 , upper side) the outer panel  72 . That is, the outer panel  72  and the inner panel  73  extend in the vehicle front-rear direction, which is a door width direction. Furthermore, the inner panel  73  is provided with an end wall portion  73   b  that extends in a thickness direction (vertical direction in  FIG. 9 ) of the door  71  at an end portion of the inner panel in the door width direction. A reinforcement  74  is provided in the vicinity of the end portion in the width direction at which the end wall portion  73   b  is provided. In addition, a latch mechanism  75  is disposed between the outer panel  72  and the inner panel  73  with a bracket  80  fixed to the end wall portion  73   b  of the inner panel  73  in a state where the latch mechanism  75  is held by the bracket  80 . 
     Specifically, as illustrated in  FIGS. 9 and 10 , the bracket  80  is provided with a base plate  82  having a latch holding portion  81 . In addition, the bracket  80  is configured such that the base plate  82  is fixed to the end wall portion  73   b  of the inner panel  73  in a state where the latch holding portion  81  holds the latch mechanism  75 . The base plate  82  is formed with a slit  84  that is open in a closing direction (upper side and right side in  FIG. 9 ) of the door  71  in a state where the base plate  82  is fixed to the door  71 . 
     Specifically, the base plate  82  is provided with a bent portion  83  that extends to intersect the latch holding portion  81 . In addition, the slit  84  is provided by cutting a corner portion of the base plate  82  which is provided with the latch holding portion  81  and the bent portion  83  and has an approximately L-shaped section. 
     That is, the bracket  80  is configured such that a striker  95  provided on a vehicle body  93  side enters the slit  84  of the base plate  82  when the door  71  moves to a fully closed position. In addition, a door lock device  91  is configured such that the latch mechanism  75  supported on the door  71  side is engaged with the striker  95  on the vehicle body  93  side when the striker  95  enters the slit  84 . 
     In addition, the bracket  80  is provided with an extension plate  86  that is fixed to the base plate  82  to extend the bent portion  83 . Furthermore, the extension plate  86  is provided with a locking portion  88  of a wire cable  87  that extends from a door handle (not shown) and an open lever  89  that rotates when being pulled by the wire cable  87 . The door lock device  91  is configured such that the latch mechanism  75  and the striker  95  are disengaged from each other when the latch mechanism  75  performs an unlatching operation due to the rotation of the open lever  89 . 
     Meanwhile, in the case of a vehicle, securing a higher safety is desirable. Therefore, the above-described door lock device is also required to further contribute to the safety of a vehicle. That is, for example, in a case where a door is pressed from the inside of a vehicle, a load applied in a thickness direction of the door is concentrated to a latch mechanism engaged with a striker on a vehicle body side. Therefore, a portion that supports the latch mechanism on the door is required to have a high support stiffness. Accordingly, there is still room for improvement. 
     Thus, a need exists for a vehicle door lock device which is not susceptible to the drawback mentioned above. 
     SUMMARY 
     A vehicle door lock device according to an aspect of the disclosure includes a latch mechanism that is engaged with a striker provided on a vehicle body and a bracket that supports the latch mechanism on a door of a vehicle. The bracket includes a base plate that includes a latch holding portion holding the latch mechanism and is fixed to the door, and an extension plate that extends in a direction intersecting the latch holding portion, the extension plate includes a fastening hole for fastening the extension plate to the door in a thickness direction of the door, a first bead-shaped portion that extends in a direction in which the extension plate extends, and a second bead-shaped portion that extends in a direction intersecting the first bead-shaped portion, and a plurality of the first bead-shaped portions and a plurality of the second bead-shaped portions are arranged in a lattice pattern. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The foregoing and additional features and characteristics of this disclosure will become more apparent from the following detailed description considered with the reference to the accompanying drawings, wherein: 
         FIG. 1  is a schematic configuration view of a door lock device provided for a door (slide door) of a vehicle; 
         FIG. 2  is a plan view of a latch mechanism (unlatched state); 
         FIG. 3  is a plan view of the latch mechanism (half-latched state); 
         FIG. 4  is a plan view of the latch mechanism (fully-latched state); 
         FIG. 5  is a side view of a bracket holding the latch mechanism (as seen from outer side in thickness direction of door); 
         FIG. 6  is a side view of the bracket holding the latch mechanism (as seen from inner side in thickness direction of door); 
         FIG. 7  is a side view of the bracket and latch mechanism fixed to the door (as seen from outer side in thickness direction of door); 
         FIG. 8  is a sectional view of the door to which the bracket holding the latch mechanism is fixed (section taken along line VIII-VIII in  FIG. 6 ); 
         FIG. 9  is a sectional view of a door to which a bracket holding a latch mechanism is fixed (related art); and 
         FIG. 10  is a side view of the bracket holding the latch mechanism (related art) (as seen from outer side in thickness direction of door). 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, an embodiment of a door lock device will be described with reference to drawings. 
     As illustrated in  FIG. 1 , a door  1  in the present embodiment is configured as a slide door  2 , which can open and close a door opening portion provided in a side surface of a vehicle (not shown) by moving in a vehicle front-rear direction. Specifically, the door  1  is configured to enter a fully-closed state, in which the door opening portion is fully closed, when the door  1  moves toward a vehicle front side (left side in  FIG. 1 ) and to enter a fully-open state, in which an occupant can board or alight via the door opening portion, when the door  1  moves toward a vehicle rear side (right side in  FIG. 1 ). In addition, the door  1  is provided with a door handle  3  (outside door handle and inside door handle) which is for opening and closing the door  1 . 
     In addition, the door  1  is provided with lock devices  10  that bind the door  1  to a vehicle body with the door  1  being in an unmovable state. Specifically, the door  1  is provided with a front lock  10   a  and a rear lock  10   b  as a fully closing lock that binds the door  1  at a fully closed position. Furthermore, the door  1  is provided with a fully opening lock  10   c  for binding the door  1  at a fully open position. In addition, each lock device  10  is configured such that it is possible to release the door  1  bound to the vehicle body in an unmovable state by operating the door handle  3 . 
     Specifically, in the case of the door  1  in the present embodiment, each lock device  10  is mechanically connected to the door handle  3  via a transmitting member  15  such as a wire cable or a link. In addition, the door  1  in the present embodiment is configured such that a releasing operation input to the door handle  3  is transmitted to each lock device  10  due to the above-described reason. 
     In addition, a remote controller (remote control device)  20  that can connect or disconnect (disconnection and reconnection) an operation transmitting system X formed by the transmitting members  15  is provided between the door handle  3  and the lock devices  10 . That is, the door  1  enters a locked state (door locked state) in which the door  1  is bound at the fully closed position when a releasing operation input to the door handle  3  becomes not able to be transmitted to each lock device  10  ( 10   a  and  10   b ) constituting the fully closing lock based on an operation of the remote controller  20 . In addition, the door locked state ends when the operation transmitting system X enters a connected state again based on an operation of the remote controller  20  (unlocked state). In addition, the vehicle provided with the door  1  is formed with a door lock device  21  for locking and unlocking the door  1  in this manner. 
     The remote controller  20  in the present embodiment connects or disconnects the operation transmitting system X between the door handle  3  and the lock devices  10  ( 10   a  and  10   b ) constituting the fully closing lock when a lock knob  22  provided inside the door  1  or a cylinder key (not shown) open to the outside of the door  1  is operated. In addition, the remote controller  20  is configured such that it is possible to connect or disconnect the operation transmitting system X by means of an operation input on an operation switch provided in a vehicle cabin, a remote operation which uses wireless communication, or the like as well. 
     More specifically, as illustrated in  FIGS. 2 to 4 , each of the lock devices  10  in the present embodiment is provided with a latch mechanism  30  that is engaged with a striker  25  provided on a vehicle body  23  side such that the striker  25  is bound and the striker  25  becomes not able to be separated. In addition, the door  1  is bound to be unmovable based on an engagement force between the latch mechanisms  30  and the strikers  25 . 
     Specifically, each of the latch mechanisms  30  of the present embodiment is provided with a latch  31  and a pawl  32  that can rotate around spindles  31   x  and  32   x , respectively. In the case of the latch mechanism  30  in the present embodiment, the outer shape of the latch  31  is an approximately flat plate-like shape provided with a striker engagement groove  33  that is open at an outer peripheral surface of the striker engagement groove  33 . In addition, the latch  31  is urged to rotate in a clockwise direction in each drawing, by a latch urging spring (not shown). Furthermore, the latch  31  abuts onto a stopper portion (not shown) such that rotation based on an urging force of the latch urging spring is restricted at a position where an opening end of the striker engagement groove  33  faces the striker  25  provided on the vehicle body  23  side. In addition, the latch mechanism  30  in the present embodiment is configured such that the striker  25  is engaged with the striker engagement groove  33  of the latch  31  as the door  1  is closed. 
     Meanwhile, the pawl  32  is urged to rotate in a counter-clockwise direction in each drawing due to a pawl urging spring (not shown). In addition, the pawl  32  in the present embodiment is configured such that a distal end portion  32   a  thereof comes into slide-contact with the outer peripheral surface of the latch  31  when the pawl  32  rotates based on an urging force of the pawl urging spring. Furthermore, the pawl  32  is configured such that the distal end portion  32   a  is engaged with the outer peripheral surface of the latch  31  in a state where the striker  25  is engaged with the striker engagement groove  33 . In addition, the latch mechanism  30  in the present embodiment is configured such that a state where the striker  25  is engaged with the striker engagement groove  33  of the latch  31  can be maintained due to the above-described reason. 
     That is, as illustrated in  FIGS. 2 and 3 , the striker  25  engaged with the striker engagement groove  33  relatively moves toward a deeper side in the striker engagement groove  33  while pressing the latch  31 . Accordingly, the latch  31  rotates in the counter-clockwise direction in each drawing against the urging force of the latch urging spring. 
     In addition, at this time, the distal end portion  32   a  of the pawl  32  apparently slides on the outer peripheral surface of the latch  31 , onto which the distal end portion  32   a  abuts, in a state where the distal end portion  32   a  is pressed against the outer peripheral surface of the latch  31  based on the urging force of the pawl urging spring. Furthermore, the distal end portion  32   a  of the pawl  32  is engaged with a first engagement portion  31   a  of the latch  31  that is formed on the outer peripheral surface of the latch  31  (half-latched state). In addition, the latch mechanism  30  in the present embodiment is configured such that a state where the striker  25  is engaged with the latch  31  is maintained since rotation of the latch  31  in a direction in which the latch urging spring urges the latch  31  (that is, clockwise direction in each drawing in which striker  25  is discharged from striker engagement groove  33 ) is restricted (half-latched state). 
     Furthermore, as illustrated in  FIGS. 3 and 4 , in the latch mechanism  30  of the present embodiment, the latch  31  can further rotate (in counter-clockwise direction in each drawing) against the urging force of the latch urging spring from a rotation position corresponding to the half-latched state. In addition, the latch mechanism  30  of the present embodiment is configured to transition into a fully-latched state, in which the striker  25  engaged with the striker engagement groove  33  can be more reliably bound with the pawl  32  engaged with a second engagement portion  31   b  formed on a peripheral surface of the latch  31 , when the latch  31  rotates and passes through a half latch position. 
     In addition, the latch mechanism  30  in the present embodiment is configured such that the pawl  32  rotates in the clockwise direction in each drawing against the urging force of the pawl urging spring when the releasing operation input to the door handle  3  is transmitted to the lock devices  10  via the operation transmitting system X as described above. That is, the pawl  32  is disengaged from the latch  31  and thus the latch  31  rotates in a releasing direction (clockwise direction in each drawing) based on the urging force of the latch urging spring due to the above-described reason. In addition, the lock device  10  in the present embodiment is configured such that the latch mechanism  30  transitions into an unlatched state in which the latch mechanism  30  is not engaged with the striker  25  on the vehicle body  23  side due to the above-described reason and thus the door  1  bound to the vehicle body  23  is released. 
     Latch Mechanism Supporting Structure 
     Next, a structure for supporting the latch mechanism  30  with respect to the door  1  will be described. 
     As illustrated in  FIGS. 5 and 6 , in the door  1  of the present embodiment, each lock device  10  ( 10   a  and  10   b ) constituting the fully closing lock is provided with a bracket  40  that holds the latch mechanism  30 . In addition, the latch mechanism  30  is supported on the door  1  with the bracket  40  fixed to the door  1 . 
     Specifically, the bracket  40  in the present embodiment is provided with a base plate  42  having a latch holding portion  41  for holding the latch mechanism  30 . In addition, the base plate  42  is provided with a bent portion  43  that extends to intersect the latch holding portion  41 . The base plate  42  in the present embodiment is formed through plastic working of a metal plate material. Accordingly, the bent portion  43  of the latch holding portion  41  is formed to have an outer shape with an approximately L-shaped section. 
     In addition, the base plate  42  is formed with a slit  44  which is formed by cutting a corner portion  42   c  with an approximately L-shaped section. Furthermore, the bracket  40  in the present embodiment is fixed to the door  1  at a position where the striker  25  provided on the vehicle body  23  side enters the slit  44  when the door  1  moves toward the fully closed position. In addition, the lock device  10  in the present embodiment is configured such that the latch mechanism  30  that is supported on the door  1  side via the bracket  40  is engaged with the striker  25  on the vehicle body  23  side. 
     Furthermore, the bracket  40  in the present embodiment is provided with an extension plate  46  that extends in a direction intersecting the latch holding portion  41  by being fixed to the base plate  42  to extend the bent portion  43 . In addition, the extension plate  46  is provided with a locking portion  48  of a wire cable  47  constituting the operation transmitting system X and an open lever  49  that rotates when being pulled by the wire cable  47 . In addition, the lock device  10  in the present embodiment is configured such that the latch mechanism  30  performs an unlatching operation based on rotation of the open lever  49 . 
     More specifically, as illustrated in  FIGS. 5 to 8 , the door  1  is provided with an outer panel  52  constituting an outer surface  1   s  and an inner panel  53  that is positioned inward of the outer panel  52 . In addition, the lock device  10  in the present embodiment is configured such that the bracket  40  is fixed to the inner panel  53  of the door  1  from an outer side in a vehicle width direction and is disposed between the outer panel  52  and the inner panel  53 . 
     In the door  1  of the present embodiment, the inner panel  53  is provided with a main body portion  53   a  that is disposed to be approximately parallel to the outer panel  52  extending in a door width direction of the door  1  configured as the slide door  2  (that is, in the vehicle front-rear direction (lateral direction in each drawing)) and an end wall portion  53   b  that extends in a thickness direction (vertical direction in  FIG. 8 ) of the door  1  at an end portion in the door width direction. Furthermore, a corner portion  53   c  of the inner panel  53  at which the main body portion  53   a  and the end wall portion  53   b  intersect each other is provided with a slit-shaped opening portion  54 . In addition, the lock device  10  in the present embodiment is configured such that the bracket  40  is fixed to the inner panel  53  at a position where the slit  44  formed in the base plate  42  that constitutes the bracket  40  overlaps the opening portion  54  provided in the inner panel  53 . 
     Specifically, in the case of the bracket  40  in the present embodiment, the latch holding portion  41  provided for the base plate  42  is fixed to the end wall portion  53   b  of the inner panel  53 . In addition, the bracket  40  in the present embodiment is configured such that the extension plate  46  extending in a direction intersecting the latch holding portion  41  of the base plate  42  fixed to the end wall portion  53   b  of the inner panel  53  is disposed along the main body portion  53   a  of the inner panel  53 . Furthermore, an end portion  46   a  of the extension plate  46 , which is separated from the latch holding portion  41  of the base plate  42  in a direction in which the extension plate  46  extends (that is, vehicle front-rear direction) is provided with a fastening hole  56  into which a fastening member (bolt) (not shown) is inserted. In addition, the bracket  40  of the present embodiment is configured such that the extension plate  46  is fixed to the main body portion  53   a  of the inner panel  53  in a thickness direction of the door  1  by means of the fastening hole  56 . 
     In the door  1  of the present embodiment, a portion at which the bracket  40  is fixed to the inner panel  53  is provided with a reinforcement  58 . In addition, the door  1  of the present embodiment is configured such that the strength of a portion supporting the latch mechanism  30  via the bracket  40  is secured due to the above-described reason. 
     In addition, as illustrated in  FIGS. 5 and 6 , the extension plate  46  in the present embodiment is provided with hole portions  57  for temporary assembly. Specifically, regarding the extension plate  46  of the present embodiment, the hole portions  57  for temporary assembly are provided in an end portion  46   b , which is separated from the end portion  46   a  provided with the fastening hole  56  in a direction (vertical direction in each drawing) intersecting the direction in which the extension plate  46  extends, and in a portion of the extension plate  46  that is close to a portion connected to the bent portion  43  of the base plate  42 . Furthermore, by means of the hole portions  57  for temporary assembly, the bracket  40  in the present embodiment is locked onto the main body portion  53   a  of the inner panel  53  in a state where the end portion  46   a  of the extension plate  46  provided with the fastening hole  56  faces a lower side of the vehicle (lower side in each drawing). In addition, in this state, the extension plate  46  is fixed to the main body portion  53   a  of the inner panel  53  and the base plate  42  is fixed to the end wall portion  53   b  of the inner panel  53 . 
     More specifically, in the bracket  40  of the present embodiment, the extension plate  46  is formed with a plurality of bead-shaped portions (first bead-shaped portions  61 ), each of which has a curved section (that is, portion having bead-like shape) and extends in the direction in which the extension plate  46  extending in the vehicle front-rear direction along the main body portion  53   a  of the inner panel  53  extends. Furthermore, the extension plate  46  is formed with a plurality of bead shaped portions (second bead-shaped portions  62 ), each of which extends in a direction intersecting the direction in which the extension plate  46  extends (that is, vehicle height direction). In addition, the extension plate  46  in the present embodiment is configured such that the first and second bead-shaped portions  61  and  62  are arranged in a lattice pattern. 
     Specifically, the extension plate  46  in the present embodiment is provided with four first bead-shaped portions  61  and two second bead-shaped portions  62 . In addition, each of the first and second bead-shaped portions  61  and  62  has a bead-like shape that protrudes toward a side opposite to a fixation surface  46   s  of the extension plate  46  with respect to the main body portion  53   a  of the inner panel  53 , that is, toward a side close to a surface S of the extension plate  46  provided with the locking portion  48  of the wire cable  47  and the open lever  49  (refer to  FIG. 8 ). In addition, the bracket  40  in the present embodiment is configured such that the stiffness of the extension plate  46  is increased with formation of the first and second bead-shaped portions  61  and  62 . 
     In addition, regarding the extension plate  46  of the present embodiment, one ( 61 A) of the four first bead-shaped portions  61  that is positioned on a central portion of the extension plate  46  in a direction (vertical direction in each drawing) intersecting the direction in which the extension plate  46  extends has a bead-like shape thicker than those of the other first bead-shaped portions  61  and the second bead-shaped portions  62 . In other words, the first bead-shaped portion  61 A having a thick bead-like shape is positioned on an approximately central portion of the extension plate  46  in the vehicle height direction in a state where the bracket  40  is fixed to the inner panel  53 , the extension plate  46  extending in the vehicle front-rear direction. Furthermore, a longitudinal end portion  61   x  of the first bead-shaped portion  61 A having the thick bead-like shape is in a region a, in which a straight line N connecting a position Px at which the latch mechanism  30  is engaged with the striker  25  on the vehicle body  23  side as described above and the fastening hole  56  provided in the end portion  46   a  of the extension plate  46  is formed. In addition, the bracket  40  in the present embodiment is configured such that a higher stiffness is given to the extension plate  46  due to the above-described reason. 
     Next, the operation and effect of the present embodiment will be described. 
     (1) In the door  1  of the vehicle, each lock device  10  ( 10   a  and  10   b ) constituting the door lock device  21  is provided with the latch mechanism  30  that is engaged with the striker  25  provided on the vehicle body  23  side and the bracket  40  that supports the latch mechanism  30  on the door  1  of the vehicle. In addition, the bracket  40  is provided with the base plate  42  that is provided with the latch holding portion  41  holding the latch mechanism  30  and is fixed to the door  1  and the extension plate  46  that extends in a direction intersecting the latch holding portion  41 . Furthermore, the extension plate  46  is provided with the fastening hole  56  for fastening the extension plate  46  to the door  1  in the thickness direction of the door  1 , the plurality of first bead-shaped portions  61  that extend in the direction in which the extension plate  46  extends, and the plurality of second bead-shaped portions  62  that extend in a direction intersecting the first bead-shaped portions  61 . In addition, the extension plate  46  has a structure in which the first and second bead-shaped portions  61  and  62  are arranged in a lattice pattern. 
     According to the above-described configuration, a load applied to the door  1  in the thickness direction can be received by the extension plate  46  fixed to the door  1  in the thickness direction in a case where the door  1  is pressed from a vehicle cabin side, for example. Furthermore, since the first and second bead-shaped portions that extend in the direction in which the extension plate  46  extends and the direction intersecting the direction in which the extension plate  46  extends are arranged in a lattice pattern on the extension plate  46 , the stiffness of the extension plate  46  can be effectively increased. Accordingly, even in a case where an excessive load is applied in the thickness direction of the door  1 , deformation of a portion supporting the latch mechanism  30  is suppressed and thus a higher safety can be secured. 
     (2) The fastening hole  56  is provided in the end portion  46   a  of the extension plate  46  that is separated from the latch holding portion  41  provided on the base plate  42  in the direction in which the extension plate  46  extends. Accordingly, a load applied to the door  1  in the thickness direction can be effectively received by the extension plate  46 . 
     (3) A bead-like shape of at least one ( 61 A) of the first bead-shaped portions  61  provided on the extension plate  46 , which is positioned on the central portion of the extension plate  46  in the direction intersecting the direction in which the extension plate  46  extends, is set to be thicker than the other first bead-shaped portions  61  and the second bead-shaped portions  62 . Accordingly, it is possible to more effectively increase the stiffness of the extension plate  46  while suppressing a dimension of the extension plate  46  in the thickness direction of the door  1 . 
     (4) The longitudinal end portion  61   x  of the first bead-shaped portion  61 A having a thick bead-like shape is in the region a, in which the straight line N connecting the position Px at which the latch mechanism  30  is engaged with the striker  25  on the vehicle body  23  side and the fastening hole  56  provided in the extension plate  46  is formed. 
     That is, due to a load applied to the door  1  in the thickness direction, a force that bends the extension plate  46  acts on the extension plate  46  in a direction connecting the position Px at which the latch mechanism  30  held by the base plate  42  is engaged with the striker  25  and the fastening hole  56  forming a fixation portion of the extension plate  46  with respect to the door  1 . However, according to the above-described configuration, it is possible to effectively increase the stiffness of the extension plate  46  corresponding to a force acting on the extension plate  46  as described above. 
     (5) Each of the first and second bead-shaped portions  61  and  62  has a bead-like shape that protrudes toward a side opposite to the fixation surface  46   s  of the extension plate  46  with respect to the door  1 . According to the above-described configuration, it is possible to reduce a space that is occupied by the extension plate  46  in a state where the extension plate  46  is fixed to the door  1 . 
     The above-described embodiment can be implemented by being modified as follows. The above-described embodiment and the following modification example can be implemented by being combined with each other as long as there is no technical conflict.
         In the above-described embodiment, the door  1  has a configuration as the slide door  2  which can open and close the door opening portion provided in the side surface of the vehicle by moving in the vehicle front-rear direction. However, the door  1  may be embodied as a supporting structure for a latch mechanism that constitutes a door lock device in another type of a vehicle door such as a swing door or a back door.   In the above-described embodiment, the extension plate  46  is provided with four first bead-shaped portions  61  and two second bead-shaped portions  62 . However, the number of first and second bead-shaped portions  61  and  62  may be randomly changed.   Furthermore, the number of first bead-shaped portions  61 A of which a bead-like shape is set to be thicker than the other first bead-shaped portions  61  and the second bead-shaped portions  62  and a setting position of the first bead-shaped portion  61 A may also be randomly changed.   A configuration of the latch mechanism  30  held by the bracket  40  may be randomly changed. In addition, the outer shape (contour) of the extension plate  46  may also be randomly changed.   In the above-described embodiment, the extension plate  46  of the bracket  40  is fixed to the bent portion  43  of the base plate  42  that has an outer shape with an approximately L-shaped section. Accordingly, the extension plate  46  extends in a direction intersecting the latch holding portion  41  of the base plate  42 . However, the disclosure is not limited to this. For example, the extension plate  46  may be integrally formed with the latch holding portion  41  of the base plate  42  through plastic working of a metal plate material or the like.       

     A vehicle door lock device according to an aspect of the disclosure includes a latch mechanism that is engaged with a striker provided on a vehicle body and a bracket that supports the latch mechanism on a door of a vehicle. The bracket includes a base plate that includes a latch holding portion holding the latch mechanism and is fixed to the door, and an extension plate that extends in a direction intersecting the latch holding portion, the extension plate includes a fastening hole for fastening the extension plate to the door in a thickness direction of the door, a first bead-shaped portion that extends in a direction in which the extension plate extends, and a second bead-shaped portion that extends in a direction intersecting the first bead-shaped portion, and a plurality of the first bead-shaped portions and a plurality of the second bead-shaped portions are arranged in a lattice pattern. 
     According to the configuration described above, a load applied to the door in the thickness direction can be received by the extension plate fixed to the door in the thickness direction in a case where the door is pressed from a vehicle cabin side, for example. Furthermore, since the first and second bead-shaped portions that extend in the direction in which the extension plate extends and the direction intersecting the direction in which the extension plate extends are arranged in a lattice pattern on the extension plate, the stiffness of the extension plate can be effectively increased. Accordingly, even in a case where an excessive load is applied in the thickness direction of the door, deformation of a portion supporting the latch mechanism is suppressed and thus a higher safety can be secured. 
     In the vehicle door lock device, it is preferable that the fastening hole is provided in an end portion of the extension plate that is separated from the latch holding portion in the direction in which the extension plate extends. 
     According to the configuration described above, a load applied to the door in the thickness direction can be effectively received by the extension plate. 
     In the vehicle door lock device, it is preferable that a bead-like shape of at least one of the first bead-shaped portions is set to be thicker than the other first bead-shaped portions and the second bead-shaped portions. 
     According to the configuration described above, it is possible to more effectively increase the stiffness of the extension plate while suppressing a dimension of the extension plate in the thickness direction of the door. 
     In the vehicle door lock device, it is preferable that a shape of the first bead-shaped portion that is positioned on a central portion of the extension plate in a direction intersecting the direction in which the extension plate extends is set to be the thick bead-like shape. 
     According to the configuration described above, it is possible to more effectively increase the stiffness of the extension plate. 
     In the vehicle door lock device, it is preferable that a shape of the first bead-shaped portion whose longitudinal end portion positions in a region in which a straight line connecting a position at which the latch mechanism is engaged with the striker and the fastening hole is formed is set to be the thick bead-like shape. 
     That is, due to a load applied to the door in the thickness direction, a force that bends the extension plate acts on the extension plate in a direction connecting the position at which the latch mechanism held by the base plate is engaged with the striker and the fastening hole forming a fixation portion of the extension plate with respect to the door. However, according to the above-described configuration, it is possible to effectively increase the stiffness of the extension plate corresponding to a force acting on the extension plate as described above. 
     In the vehicle door lock device, it is preferable that each of the first and second bead-shaped portions has a bead-like shape that protrudes toward a side opposite to a fixation surface of the extension plate with respect to the door. 
     According to the configuration described above, it is possible to reduce a space that is occupied by the extension plate in a state where the extension plate is fixed to the door. 
     According to the aspect of this disclosure, it is possible to secure a higher support stiffness for a latch mechanism. 
     The principles, preferred embodiment and mode of operation of the present invention have been described in the foregoing specification. However, the invention which is intended to be protected is not to be construed as limited to the particular embodiments disclosed. Further, the embodiments described herein are to be regarded as illustrative rather than restrictive. Variations and changes may be made by others, and equivalents employed, without departing from the spirit of the present invention. Accordingly, it is expressly intended that all such variations, changes and equivalents which fall within the spirit and scope of the present invention as defined in the claims, be embraced thereby.