JP5417951B2 - Hinge structure - Google Patents

Description

  The present invention relates to a hinge structure applied to an openable / closable roof portion of an automobile.

  2. Description of the Related Art Conventionally, a folding roof part that can open and close a roof part of a vehicle is stored in a recessed storage part at the rear of the passenger compartment and forward of the trunk room (see Patent Document 1). ).

  A cover lid member that opens and closes the upper surface of the storage portion by a hinge portion having a single rotation center is provided on the upper surface of the storage portion.

  In such a case, the front edge of the cover lid member is rotated upward about the hinge portion where the rear edge of the cover lid member is also provided, so that the upper surface of the storage portion is opened. Thus, the folded roof portion is stored.

Japanese Patent Laid-Open No. 5-185846

  However, in such a conventional hinge structure, when the cover lid member is opened, the front edge portion of the cover lid member rotates upward with the hinge portion having a single rotation center as the rotation center. Is done.

  For this reason, if the rear edge of the folding roof part is not greatly raised so that the rear edge part of the folding roof part does not exist on the rotation trajectory of the front edge part of the cover lid member, the cover lid The front edge portion of the member interferes with the rear edge portion, and the cover lid member cannot be opened.

  Therefore, the flip-up mechanism of the folding roof portion becomes complicated, and a large force is required for the hood storage work.

  Accordingly, an object of the present invention is to provide a hinge structure that allows the cover lid member to be opened without greatly raising the rear edge of the folded roof portion.

In order to achieve the above object, the present invention provides a rear edge portion of an upper surface opening of a storage portion in which a folding roof portion of a vehicle is accommodated, and a rear edge portion of a cover lid member that opens and closes the upper surface opening. A hinge member for supporting the cover lid member on the vehicle is provided, and the hinge member is supported on the vehicle so as to be movable in parallel by moving the cover lid member obliquely up and down in the vehicle front-rear direction. A parallel link mechanism and a rear edge of the cover lid member such that a front edge portion of the cover lid member pivots upward about a rear edge portion so that the upper surface opening is opened by the cover lid member. parts wherein a hinge structure that has a vertically turning means for pivotally supporting the upper link member of the parallel link mechanism, the hinge member is provided on the upper link member, before The parallel link mechanism is locked in a state where the upper surface opening is opened by the cover lid member, the parallel movement of the cover lid member to the front of the vehicle by the parallel link mechanism is prohibited, and the cover lid member In a state in which the front edge portion is inclined downward, the parallel link mechanism includes a parallel movement prohibiting unit that enables the parallel movement of the cover lid member to the front of the vehicle .

  According to the present invention, after the cover lid member is moved substantially in parallel toward the rear of the vehicle by the hinge member, the front edge portion of the cover lid member is pivoted upward.

  For this reason, since the turning trajectory of the front edge portion of the cover lid member has moved backward by the amount of parallel movement to the rear of the vehicle, the cover lid member can be moved without greatly raising the rear edge portion of the roof portion. It can be made openable.

  Therefore, it is not necessary to complicate the roof raising mechanism and the like, and no great force is required for the hood storage work.

It is a perspective view explaining the structure which looked at the hinge part of the open state in the hinge structure of embodiment of this invention from the vehicle diagonally forward. It is a perspective view explaining the structure which looked at the hinge part of the open state from the diagonally backward front of the vehicle by the hinge structure of embodiment. It is a top view of vehicles explaining a position where a hinge part is used in a hinge structure of an embodiment. It is a side view of the vehicle explaining the position where the hinge part of embodiment is used. It is a top view explaining the structure of a hinge part by the hinge structure of embodiment. It is a front view explaining the structure of a hinge part by the hinge structure of embodiment. It is an exploded perspective view of a hinge part by the hinge structure of an embodiment. (A) is a roof part obstruction | occlusion state, (b) is the schematic diagram showing a mode that the conventional roof part shown as a comparative example interferes by rotation of a cover lid member, in the hinge structure of embodiment. (c) is a schematic diagram showing how the hinge mechanism moves backward in parallel, and (d) is a schematic diagram showing how the cover lid member rotates without interference by the hinge mechanism. In the hinge structure of the embodiment, a series of operations until the roof portion is opened will be described, (a) is the roof portion closed state, (b) is rotated by the parallel movement of the cover lid member, The figure showing a mode that it opens, (c) is a mimetic diagram showing a state where translation was locked by the translation prohibition means in the state where the cover lid member was opened. In the hinge structure of the embodiment, a series of operations until the cover lid member is closed will be described. (A) is a state where the cover lid member is opened, and (b) is a downward direction of the cover lid member. (C) is a diagram showing a state in which the lock by the parallel movement prohibiting means is released due to the rotation, and (d) is a state where the cover lid member is moved by the parallel movement. The figure showing a mode that it advances ahead of vehicles, (e) is a mimetic diagram showing a mode that a cover lid member obstruct | occluded the storage part upper surface.

  Hereinafter, a hinge structure according to an embodiment of the present invention will be described based on the drawings.

  1 to 10 show a hinge structure according to an embodiment of the present invention.

  First, in terms of the overall configuration, in the hinge structure of this embodiment, a soft top 4 as a folding roof portion is provided on the roof portion 3 that covers the upper portion of the passenger compartment 2 of the vehicle 1 as shown in FIGS. Is provided to be openable and closable.

  In this vehicle 1, a storage portion 5 for storing the soft top 4 in a folded state is formed in a recessed manner behind the passenger compartment 2 and in front of the rear trunk room 6.

  A cover lid member 8 capable of opening and closing the upper surface opening of the storage portion 5 is provided on the rear edge 5a of the upper surface opening of the storage portion 5 via a pair of hinge members 7 and 7 in the vehicle width direction. The rear edge 8b is attached.

  The front edge portion 8a of the cover lid member 8 is positioned below the rear edge portion 4a of the soft top 4 in a state where the cover lid member 8 and the soft top 4 are closed. It is comprised so that it may overlap up and down in the front-back direction.

  As shown in FIG. 7, the hinge member 7 is constituted by a parallel link mechanism 9, and parallel moving means for moving the cover lid member 8 substantially in parallel toward the rear of the vehicle, and a shaft in the vehicle width direction. It is composed of a pivot shaft 10 having an extending direction, and is pivoted up and down to pivot the front edge portion 8a of the cover lid member 8 upward in a state of being substantially translated rearward of the vehicle. And a parallel movement prohibiting means for prohibiting a substantially parallel movement forward of the vehicle by the parallel moving means.

  Among these, the parallel link mechanism 9 includes a lower bracket member 12 fixed to the rear edge 5a of the upper surface opening of the storage portion 5 on the vehicle body side, and a front side pivotally supported by the lower bracket member 12. The link member 13 and the rear link member 14, and the upper link member 15 pivotally attached to the front end portion 13a of the front link member 13 and the front end portion 14a of the rear link member 14 so as to be rotatable. It is mainly composed.

  Further, as shown in FIG. 7, front opening portions 15a and 15a are formed in the vicinity of the front end portion of the upper link member 15, and the rotating shaft 10 is formed in the front opening portions 15a and 15a. A rotating shaft member 10a is provided.

  Then, the rear edge portion 16a of the upper bracket member 16 attached to the rear edge portion 4a of the soft top 4 is pivotally supported by the rotation shaft member 10a so as to be rotatable. However, it is mainly composed.

  That is, the lower surface portion 8c of the cover lid member 8 is fixed to the upper surface portion 16b of the upper bracket member 16, so that the cover lid member 8 can be moved forward and backward along with the movement of the upper bracket member 16. It is configured to move up and down in the direction and rotation direction.

  Further, as shown in FIG. 7, the lower bracket member 12 is integrally provided with fixing flange portions 12b and 12b at the lower ends of a pair of left and right leg portions 12a and 12a, and is inserted into the bolt holes 12c and 12c. It is configured to be fixed to the rear edge 5a of the upper surface opening of the storage portion 5 by a fixing tool such as a bolt member.

  A rear wall 12d for connecting the legs 12a, 12a is provided at the rear edge of the legs 12a, 12a, and the front side is opened together with the legs 12a, 12a in the vehicle top view. It is integrally formed so as to exhibit a substantially U-shape.

  Shaft holes 12e, 12e and 12f, 12f are provided in the vicinity of the rear edges of the legs 12a, 12a, respectively.

  The shaft holes 12e, 12e and 12f, 12f are inserted with rotating shaft members 20, 21 that pivotally support the front link member 13 and the rear link members 14, 14, respectively, so that the stopper 20a is inserted. , 21a is fixed so that it cannot be pulled out.

  The rotating shaft member 20 is inserted into the rear shaft holes 13c and 13c formed in the rear end portions 13b of the left and right side wall portions 13d and 13d of the front side link member 13 through the bearing members 20b and 20b. The front end portion 13a of the front side link member 13 is inserted in the up-down direction.

  The left and right side wall portions 13d and 13d of the front side link member 13 are integrally connected by a bottom wall portion 13e, and the cross-sectional shape in the vehicle width direction is substantially U-shaped to open upward. ing.

  Further, front shaft holes 13f and 13f are formed in the vicinity of the front end portion 13a of the left and right side wall portions 13d and 13d of the front side link member 13, and the front side opening portions 15a and 15a of the upper link member 15 are formed. The boss member 22a provided on the rotary shaft member 22 inserted through the shaft is supported by the bearing members 22a and 22a while being sandwiched between the left and right side wall portions 13d and 13d, and is prevented from coming off by the stopper 22b. It is fixed.

  The upper link member 15 is connected to a front half of the left and right side portions 15b and 15b provided in a pair of left and right sides so as to exhibit a substantially U-shaped cross section that opens the lower side by an upper surface portion 15c. Bend the rear of the vehicle in a crank-like direction away from the center portions 15d and 15d, and the distance between the left and right side surface portions 15b and 15b of the rear half is compared to the front half. It is configured to be wide.

  Shaft hole portions 15e and 15e are formed in the center portion 15d of the left and right side surface portions 15b and 15b.

  The shaft hole portions 15e and 15e are rotatable to front opening portions 14c and 14c formed in the front end portions 14a and 14a of the rear link members 14 and 14 via bearing members 23b and 23b. The pivot shaft member 23 is inserted so as to be pivotally supported, and is fixed by the stopper 23a so as not to be extracted.

  The rotating shaft member 21 is inserted into the rear shaft holes 13c and 13c formed in the rear end portions 14b and 14b of the rear link members 14 and 14 through the bearing members 21b and 21b, respectively. Thus, the front end portion 14a of the rear link member 14 is supported so as to be rotatable in the vertical direction around the rotation shaft member 21 as a rotation center.

  For this reason, in this parallel link mechanism 9, the upper link member 15 constitutes a parallel link supported by the front link member 13 and the rear link members 14, 14, and the cover shown in FIG. From the lid closed state to the cover lid open state shown in FIGS. 9B and 9C, the upper link member 15 moves obliquely upward toward the rear of the vehicle, while the inclination angle α is substantially constant. A substantially parallel movement that is maintained is performed.

  In the vicinity of the rear edge portion of the upper link member 15, rotation shaft insertion holes 15f and 15f are formed in the left and right extension arm portions 15g and 15g, respectively.

  Further, rotation shaft holes 16c and 16c are formed in the left and right rear wall portions 16d and 16d of the upper bracket member 16, respectively.

  Then, the inserted rotation shaft member 10a is inserted into the rotation shaft insertion holes 15f and 15f and the rotation shaft holes 16c and 16c, respectively, and the tip is crimped and stopped by the stopper 10b. It is configured so that it cannot be taken out.

  Furthermore, the left and right rear wall portions 16d and 16d of the upper bracket member 16 are integrally formed by an upper wall portion 16e so as to exhibit a substantially U-shaped cross section that opens downward, as shown in FIG. As shown to (a), the stopper contact surface 16f is formed in the lower surface side.

  From the stopper contact surface 16f of the upper bracket member 16, the upper surface portion 16b is integrally extended toward the vehicle front direction.

  In this embodiment, in the state where the cover lid member 8 is opened, the front edge portion 8a of the cover lid member 8 is moved by the vertical rotation means having the rotation shaft member 10a as the rotation center. The cam member 17 as a parallel movement prohibiting means swings on the rotary shaft member 10a so that the parallel link mechanism 9 is prohibited from moving in the forward direction until it is pivoted downward. It is supported freely.

  As shown in FIG. 7, the cam member 17 is biased in the locking direction by a spring member 19 provided on one of the pair of boss members 18 and 18 through which the rotating shaft member 10a is inserted. Has been.

  The cam member 17 of this embodiment is provided with a lock input surface portion 17a that is in contact with the stopper contact surface 16f.

  Further, both end portions of the shaft member 26 are locked to the roller shaft holes 14e, 14e formed in the upper end portions 14d, 14d of the rear link members 14, 14, and the shaft member 26 is rotated. A cylindrical roller member 27 movably inserted is configured to be positioned between the upper end portions 14d and 14d.

  Then, when the upper bracket member 16 is rotated by opening the cover lid member 8, as shown in the arrow direction (2) in FIG. Is abutted, the cam member 17 is swung together with the upper bracket member 16.

  Then, as shown in FIG. 9C, when the cam tip 17d of the cam member 17 gets over the roller member 27, the lock recess 17c is engaged with the outer peripheral surface of the roller member 27, The rotation of the upper bracket member 16 is stopped, and the substantially parallel movement of the parallel link mechanism 9 is stopped.

  In a state in which the lock recess 17c is engaged with the roller member 27, the shaft member 26 supporting the roller member 27 provided on the rear link member 14 can move in the direction of the rotation shaft 10. Absent.

  For this reason, the rotational movement of the front link members 13 and the rear link members 14 and 14 in the direction of the arrow (4) in FIG. 9C is locked, and the upper link member 15 is moved forward of the vehicle. Substantially parallel movement is prohibited.

  Further, in this embodiment, the cam member 17 is integrally provided with a lock release lever portion 17b that is in contact with a lock release input surface 16g provided on the back surface side of the upper surface portion 16b.

  Then, as shown in the arrow direction (3) of FIG. 9 (c), when the cover lid member 8 is rotated downward, the upper bracket member 16 is also accompanied by this rotation. The lock release lever portion 17b rotates and comes into contact with and presses the lock release input surface.

  For this reason, the cam member 17 swings about the rotation shaft 10 as a rotation center, and the engagement of the lock recess 17c with the roller member 27 is released.

  For this reason, the shaft member 26 supporting the roller member 27 provided on the rear link member 14 is movable in the direction of the rotation shaft 10, and each of the front link members 13 as shown in FIG. The rear link members 14 and 14 can be pivoted and moved in the same manner as possible, and the upper link to the front of the vehicle is moved by the pivoting movement in the direction of arrow (4) in FIG. It is comprised so that the substantially parallel movement of the member 15 can be performed.

  Further, in this embodiment, an upper bracket stopper member 12h is attached to one of the fixed flange portions 12b of the lower bracket member 12 via a support piece member 12g.

  The head portion 12i of the upper bracket stopper member 12h is configured such that the vertical stop position of the upper bracket member 16 can be changed by changing the screwing amount of the screw portion 12j to the support piece member 12g. Has been.

  9A, when the front end edge lower surface side 16h of the upper bracket member 16 is brought into contact with the upper surface side of the head 12i, the upper bracket member 16 becomes substantially horizontal. The upper surface opening of the storage portion 5 is closed by the cover lid member 8 as shown in FIG.

  Further, as shown in FIG. 9B, when the upper bracket member 16 is moved substantially in parallel toward the rear of the vehicle by the parallel link mechanism 9, the lower surface side 16h of the front edge becomes the head 12i. The front edge portion 8a of the cover lid member 8 fixed to the upper bracket member 16 as shown in FIG. It is comprised so that it may incline toward.

  Next, the effect of the vehicle hinge structure of this embodiment will be described.

  In this embodiment, in a state where the cover lid member 8 closes the upper surface side of the storage portion 5, as shown in FIGS. 3 and 4, the lower surface side of the rear edge portion 8 b of the cover lid member 8. Further, the upper bracket member 16 as shown in FIG. 9A is mounted in a substantially horizontal state. In order to open the cover lid member 8, the rear edge 4a of the soft top 4 shown in FIG. 8B shown as a comparative example is flipped up from the state shown in FIG. When the cover lid member 8 is rotated upward with the moving shaft 10 as the center of rotation, the front edge portion 8a of the cover lid member 8 interferes unless the rear edge portion 4a is greatly raised.

  For this reason, in the present embodiment, as shown in FIG. 8C, the cover lid member 8 is moved substantially in parallel toward the rear of the vehicle by the hinge members 7, 7, and thereafter, as shown in FIG. ), The front edge 8a of the cover lid member 8 is pivoted upward.

  Therefore, since the turning trajectory of the front edge portion 8a of the cover lid member 8 is moved backward by the amount of parallel movement to the rear of the vehicle, the cover lid can be moved without greatly raising the rear edge portion 4a of the soft top 4. The member 8 can be openable.

  Therefore, it is not necessary to complicate the flip-up mechanism of the roof portion 3, and a large force is not necessary for the hood storage work.

  That is, in this embodiment, as shown in FIG. 9A, a drive actuator (not shown) is used from the state of being stopped at the vehicle front position by the parallel link mechanism 9 of the hinge portion 7. As shown in FIG. 9B, the upper bracket member 16 is moved toward the rear of the vehicle in the direction of the arrow (1).

  In the movement of the upper bracket member 16, the upper link member 15 provided with the rotation shaft 10 is moved substantially parallel and obliquely upward toward the rear of the vehicle while maintaining a substantially constant inclination angle α.

  At this time, if the parallel movement to the rear of the vehicle is not completed, the distance between the rotating shaft member 10a and the roller member 27 is not expanded.

  For this reason, the cam tip 17d of the cam member 17 pivotally supported by the rotating shaft member 10a abuts on the outer peripheral surface of the roller member 27 and cannot be overcome.

  Accordingly, the cover lid member 8 cannot be rotated upward, and the front edge portion 8a of the cover lid member 8 is rotated to the rear edge portion 4a of the soft top 4 during the translation. There is no risk of interference.

  As shown in FIG. 9 (b), when the cover lid member 8 completes parallel movement rearward of the vehicle by the parallel link mechanism 9 of the hinge portion 7, the rotating shaft member 10a, the roller member 27, Is widened so that the cam tip 17d of the cam member 17 pivotally supported by the rotating shaft member 10a can get over the outer peripheral surface of the roller member 27 as indicated by a two-dot chain line.

  For this reason, the cover lid member 8 pivots upward together with the upper bracket member 16 about the pivot shaft 10 as shown by an arrow (2) in FIG. Is acceptable.

  A two-dot chain line shown in FIG. 9B indicates a state where the cover lid member 8 is opened.

  In this state, as shown in FIG. 9 (c), the lock recess 17 c of the cam member 17 is engaged with the outer peripheral surface of the roller member 27, and the upper bracket member 16 is moved around the rotating shaft 10. As a center, the downward rotational movement indicated by the arrow (3) is stopped so as not to easily occur.

  Further, since the lock recess 17c of the cam member 17 is engaged with the outer peripheral surface of the roller member 27, the distance between the rotating shaft member 10a and the roller member 27 does not decrease.

  For this reason, a parallel movement forward of the vehicle by the parallel link mechanism 9 is prohibited.

  Therefore, when the cover lid member 8 is rotated upward and opened, a substantially parallel movement by the parallel link mechanism 9 occurs, and the cover lid member 8 may move toward the front of the vehicle. There is no.

  Next, the cover lid member 8 will be described from the open state to the closed state with reference to FIGS.

  In this embodiment, as shown in FIG. 10A, the upper bracket member 16 is moved in the direction of the arrow (3) using a drive actuator (not shown) from the state in which the cover lid member 8 is opened. Is turned downward in the vehicle vertical direction.

  As shown in FIG. 10B, the unlocking lever portion 17b of the cam member 17 abuts on the unlocking input surface 16g provided on the back surface side of the upper surface portion 16b of the upper bracket member 16, The cam member 17 is rotated in the direction of the arrow (3 ′).

  As shown in FIG. 10 (c), the cam tip 17d of the cam member 17 rotates to a position over the straight line connecting the rotating shaft 10 and the shaft member 26 on which the roller member 27 is supported. When reaching by movement, a substantially parallel movement by the parallel link mechanism 9 in the direction of arrow (4) in FIG.

  Then, as shown in FIG. 10E, the upper bracket member 16 is translated in the forward direction of the vehicle in the direction of the arrow (4 ').

  In this embodiment, the cam tip 17d of the cam member 17 interferes with the roller member 27 during the substantially parallel movement by the parallel link mechanism 9, so that the cover lid member 8 can be rotated upward. There is no possibility that the front edge portion 8a of the cover lid member 8 may interfere with the rear edge portion 4a of the soft top 4 due to the rotation in the middle of the parallel movement.

  Further, as shown in FIG. 10 (d), during the substantially parallel movement, the cover lid member 8 is kept in a state where the front edge portion 8a is inclined toward the lower side of the vehicle, and the rear side of the soft top 4 is maintained. Even if the edge part 4a is not so greatly raised, it is interposed between the rear edge part 4a of the soft top 4 and the vehicle body, and there is no possibility of interference.

  Moreover, as shown in FIG. 10 (e), when the cover lid member 8 is fully closed, the unlocking lever portion of the cam member 17 is supported by the shaft member 26 on which the roller member 27 is pivotally supported. 17b is pushed up from below, and the lower surface portion 8c of the cover lid member 8 is supported from below along with the upper bracket member 16, and as shown in FIG. 6 or FIG. A front end edge lower surface side 16h of the bracket member 16 is in contact with an upper surface side of the head portion 12i of the upper bracket stopper member 12h, and the cover lid member 8 is supported so as to be in a substantially horizontal state.

  The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to this embodiment. Included in the invention.

  That is, in the embodiment, the hinge members 7, 7 that support the cover lid member 8 so as to be openable / closable are provided in a pair of left and right in the vehicle width direction. One or more pieces may be used, and the arrangement position, shape, quantity and material are not particularly limited.

  Moreover, in the said embodiment, although the soft top 4 is used as a folding roof part which comprises the roof part 3, it is not restricted to this in particular, For example, the folding roof part comprised with the hard material made from a metal or resin However, the shape, the number, and the material are not particularly limited as long as they are stored in the storage portion 5 closed by the cover lid member 8.

1 Vehicle 3 Roof 4 Soft Top (Folding Roof)
DESCRIPTION OF SYMBOLS 5 Storage part 5a Rear side edge of upper surface opening 7 Hinge member 8 Cover lid member 8a Front edge part 8b Rear edge part 9 Parallel link mechanism (parallel movement means)
10 Rotating shaft (vertical rotating means)
16 Upper bracket member (vertical turning means)
17 Cam member (translation prohibition means)
27 Roller member (Parallel movement prohibition means)

Claims (3)

A hinge member for supporting the cover lid member on the vehicle between a rear edge portion of an upper surface opening of a storage portion in which a folding roof portion of the vehicle is accommodated and a rear edge portion of a cover lid member that opens and closes the upper surface opening. Is provided,
The hinge member includes a parallel link mechanism that supports the vehicle so that the cover lid member can move in parallel by moving the cover lid member obliquely up and down in a vehicle longitudinal direction, and a front edge portion of the cover lid member is centered on a rear edge portion. The upper edge of the parallel link mechanism is pivotally supported by the upper link member of the parallel link mechanism so that the upper surface opening is opened by the cover lid member. A hinge structure provided with rotating means,
The hinge member is provided on the upper link member, locks the parallel link mechanism in a state where the upper surface opening is opened by the cover lid member, and the front cover of the cover lid member by the parallel link mechanism is locked. Parallel movement that prohibits parallel movement to the front of the vehicle by the parallel link mechanism in a state in which the parallel movement is prohibited and the front edge of the cover lid member is inclined downward. A hinge mechanism comprising movement prohibiting means. The parallel link mechanism includes a front link member and a rear link member that support the upper link member, a roller member is provided on the rear link member,
The parallel movement prohibiting means is rotatably supported by a rotating shaft of the vertical rotating means, and the front edge portion of the cover lid member faces downward from the state where the cover lid member is open. The hinge according to claim 1 , further comprising a cam member that engages with the roller member of the rear link member so as to prohibit parallel movement of the parallel link mechanism forward of the vehicle until the parallel link mechanism is rotated. mechanism. The vertical rotation means includes a rotation shaft that supports a rear edge portion of the cover lid member on the upper link member, a rear edge portion of the cover lid member that is supported by the rotation shaft so as to be vertically rotatable. And an upper bracket member attached thereto,
The cam member is engaged with the upper bracket to rotate the cam member when the cover lid member is rotated downward from the open state, and the cam member is engaged with the roller member. The hinge mechanism according to claim 2, further comprising a lock release lever for releasing the lock mechanism.

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