CN114135767A

CN114135767A - Display support

Info

Publication number: CN114135767A
Application number: CN202111524751.XA
Authority: CN
Inventors: 尤小东; 王宏军
Original assignee: Ningbo Tuotuohe Design Co ltd
Current assignee: Ningbo Tuotuohe Design Co ltd
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-03-04
Also published as: WO2023109690A1

Abstract

The disclosed embodiment provides a display support, including: the base is provided with a first hinge point and a second hinge point; a third hinge joint point and a fourth hinge joint point are arranged on the connecting head; the first end of the first connecting arm is hinged to the first hinge point, and the second end of the first connecting arm is hinged to the third hinge point; the first end of the second connecting arm is hinged to the second hinge point, and the second end of the second connecting arm is hinged to the fourth hinge point; the first hinge point, the second hinge point, the third hinge point and the fourth hinge point form a quadrilateral structure with the first connecting arm and the second connecting arm; the elastic component comprises an elastic component for providing elastic force, and an included angle between the elastic component and the first connecting arm is fixed and constant in the process that the connecting head moves from a high point to a low point or from the low point to the high point.

Description

Display support

Technical Field

The present disclosure relates to a display stand.

Background

In the related art, the height-adjustable display support mostly adopts a quadrilateral structure and a fixed supporting point, and the supporting point usually adopts a fixed spring or an elastic element such as a gas spring and the like to provide certain elastic force to enable the support to overcome the gravity of the display and to enable the support to keep a hovering state.

Fig. 1 is a schematic structural diagram of a conventional monitor stand, and as shown in fig. 1, ends of an upper connecting arm 2 and a lower connecting arm 3 of the monitor stand are respectively hinged to a base 1 and a connector 4, thereby constructing a quadrilateral structure, and in addition, one end of an elastic balance mechanism (including an adjusting rod 8 and an elastic member 7) is hinged to the upper connecting arm and the other end is hinged to the connector. After adjustment display and elasticity balance mechanism reach balanced, the display can rotate wantonly from top to bottom and freely stop, the display rotates the in-process from top to bottom, the elastic component can constantly be stretched, the elastic force increase, the contained angle of elastic force balance mechanism and last linking arm can reduce, change to 5 by 6, change to 3 again for the torque is unchangeable, thereby make at last rotation in-process from top to bottom, the torque that elastic component 7 provided reaches the same in any position, the realization can freely stop in any position.

Above-mentioned display support is carrying out the in-process of adjusting the height and the angle of display, because the contained angle between elasticity balance mechanism and the last linking arm can change, consequently, display support needs to reserve certain space when the design to the contained angle change of adaptation elasticity balance mechanism and last linking arm, from this, make display support volume great relatively. How to reduce the volume of the display bracket by rationalizing the design is a problem to be solved urgently.

Disclosure of Invention

An object of the disclosed embodiments is to provide a display stand, which is advantageous to reduce the volume of the display stand. The specific technical scheme is as follows:

the embodiment of the present disclosure provides a display support, including: the base is provided with a first hinge point and a second hinge point; the connector is used for mounting a display, and a third hinge joint and a fourth hinge joint are arranged on the connector; the first end of the first connecting arm is hinged to the first hinge point, and the second end of the first connecting arm is hinged to the third hinge point; the first end of the second connecting arm is hinged to the second hinge point, and the second end of the second connecting arm is hinged to the fourth hinge point; the first hinge point, the second hinge point, the third hinge point and the fourth hinge point form a quadrilateral structure with the first connecting arm and the second connecting arm; the elastic assembly is configured to balance the gravity of the display, the elastic assembly comprises an elastic member for providing elastic force, and an included angle between the elastic member and the first connecting arm is fixed during the process that the connecting head moves from a high point to a low point or from the low point to the high point.

According to the display support in the embodiment of the disclosure, the display support adopts a quadrilateral structure, the height change of the display support can be realized through the position change of each side of the quadrilateral structure, and meanwhile, the gravity of the display is balanced by the elastic member, so that the display can be suspended at any height. In addition, the elastic assembly includes an elastic member for providing an elastic force, and an included angle between the elastic member and the first connection arm is fixed and constant during the movement of the connection head from the high point to the low point or from the low point to the high point, that is, the included angle between the elastic member and the first connection arm is always constant during the adjustment of the height of the display stand. Because contained angle remains unchanged throughout between elastic component and the first linking arm, so the display support need not to reserve the space that supplies it to realize the angle change for elastic component when designing, consequently, is favorable to reducing the whole volume of display support, and then is favorable to satisfying the lightweight design demand of display support.

In some embodiments of the present disclosure, the elastic member comprises a spring, and an included angle between an axis of the spring and the first connecting arm is constant during the movement of the connecting head from the high point to the low point or from the low point to the high point; the elastic component further comprises a linkage rod, the linkage rod comprises a rod body and a movable portion, the movable portion is arranged on the rod body, the first end of the rod body is hinged to the base, the movable portion is arranged at the second end of the rod body, the movable portion is connected with the first connecting arm in a movable mode, and the end portion of the spring is connected with the movable portion.

In some embodiments of the present disclosure, the first end of the rod body of the linkage rod is hinged with a second hinge point.

In some embodiments of the present disclosure, the movable portion and the rod body are of an integral structure or a split structure.

In some embodiments of the present disclosure, the movable portion is a sliding shaft, a rolling shaft or a rolling wheel disposed at the second end of the rod body.

In some embodiments of the present disclosure, a guide portion is provided on the first connecting arm, and at least a portion of the movable portion is restricted to the guide portion.

In some embodiments of the present disclosure, the movable portion is connected to an end of the spring near the connection head, or the movable portion is connected to an end of the spring near the base.

In some embodiments of the present disclosure, the elastic member comprises a spring, and an included angle between an axis of the spring and the first connecting arm is constant during the movement of the connecting head from the high point to the low point or from the low point to the high point; elastic component still includes flexible traction piece and guide, the one end of flexible traction piece install in being close to of spring the one end of connector, the other end of flexible traction piece is connected the connector, the guide sets up on first linking arm or the second linking arm, the guide is configured to be in flexible traction piece motion in-process is right flexible traction piece leads.

In some embodiments of the present disclosure, the flexible traction element is a traction rope.

In some embodiments of the present disclosure, the guide is a pulley, the flexible traction member is tensioned against the pulley; or, the guide part is a tube structure, and the flexible traction part passes through the tube structure; or, the guide part is of a groove structure, and the flexible traction part penetrates through the groove structure.

In some embodiments of the present disclosure, the elastic member further includes a screw rod, a first thread bushing, and a rotating shaft, the first thread bushing is fixedly connected to the spring, the screw rod is in thread fit with the first thread bushing, the rotating shaft is sleeved on the screw rod, and the screw rod is rotatably installed at the first hinge point through the rotating shaft.

In some embodiments of the present disclosure, the first connecting arm includes a first shell and a second shell that snap together in an opposing manner to define a receiving cavity; the second connecting arm and the elastic component are arranged in the accommodating cavity.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other embodiments can be obtained by using the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a conventional display stand;

FIG. 2 is a cross-sectional view of a display stand according to some embodiments of the present disclosure;

FIG. 3 is an exploded view of a display stand according to some embodiments of the present disclosure;

FIG. 4 is a cross-sectional view of a monitor support according to further embodiments of the present disclosure;

fig. 5 is an exploded view of a display stand according to further embodiments of the present disclosure.

The reference numbers in the drawings are as follows:

a base 100, a first hinge point 110, a second hinge point 120;

a connector 200, a third hinge point 210, and a fourth hinge point 220;

a first link arm 300, a guide 310, a pulley 320, a first housing 330, a second housing 340;

a second connecting arm 400;

the elastic component 500, the elastic member 510, the screw 520, the rotating shaft 521, the first thread sleeve 530, the spring 540, the linkage rod 550, the movable part 560, the flexible traction piece 570 and the second thread sleeve 580;

the panel assembly 600.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments that can be derived from the disclosure by one of ordinary skill in the art based on the embodiments in the disclosure are intended to be within the scope of the disclosure.

Referring to fig. 2, the present disclosure provides a monitor stand, which includes a base 100, a connector 200, a first connecting arm 300, a second connecting arm 400, and an elastic element 500. Specifically, the base 100 is provided with a first hinge point 110 and a second hinge point 120, the connector 200 is used for mounting a display, the connector 200 is provided with a third hinge point 210 and a fourth hinge point 220, a first end of the first connecting arm 300 is hinged to the first hinge point 110, a second end of the first connecting arm 300 is hinged to the third hinge point 210, a first end of the second connecting arm 400 is hinged to the second hinge point 120, and a second end of the second connecting arm 400 is hinged to the fourth hinge point 220. The elastic assembly 500 is configured to balance the weight of the display, and the elastic assembly 500 includes an elastic member 510 for providing an elastic force. During the movement of the connection head 200 from the high point to the low point or from the low point to the high point, the included angle between the elastic member 510 and the first connection arm 300 is constant.

Specifically, the first hinge point 110, the second hinge point 120, the third hinge point 210, and the fourth hinge point 220 may serve as four points of a quadrangular structure, and accordingly, the base 100, the connector 200, the first connecting arm 300, and the second connecting arm 400 may serve as four sides of the quadrangular structure, thereby being combined into the quadrangular structure. Based on the display support with the quadrilateral structure, the height of the display support can be adjusted, and in the process of adjusting the height, the elastic component 500 is used for balancing the gravity of the display, so that the display can be suspended at any height.

According to the display support in the embodiment of the disclosure, the display support adopts a quadrilateral structure, the height change of the display support can be realized through the position change of each side of the quadrilateral structure, and meanwhile, the gravity of the display is balanced by the elastic member, so that the display can be suspended at any height. In addition, the elastic assembly 500 includes an elastic member 510 for providing an elastic force, and an angle between the elastic member 510 and the first connection arm 300 is fixed during the movement of the connection head 200 from the high point to the low point or from the low point to the high point, that is, the angle between the elastic member 510 and the first connection arm 300 is always constant during the adjustment of the height of the display stand. Because the included angle between the elastic member 510 and the first connecting arm 300 is always kept unchanged, the display bracket does not need to leave a space for the elastic member 510 to change the angle during the design, and therefore, the overall size of the display bracket is favorably reduced, and the lightweight design requirement of the display bracket is favorably met.

Referring to fig. 2 and 3, in some embodiments, the elastic member 510 includes a spring 540, and an angle between an axis of the spring 540 and the first connecting arm 300 is constant during the movement of the connecting head 200 from the high point to the low point or from the low point to the high point. The elastic assembly 500 further includes a linkage rod 550, the linkage rod 550 includes a rod body and a movable portion 560 disposed on the rod body, one end of the rod body is hinged to the base 100, the movable portion 560 is disposed at a second end of the rod body, the movable portion 560 is movably connected with the first connection arm 300, and an end of the spring 540 is connected with the movable portion 560.

The angle between the elastic member 510 and the first connecting arm 300 is specifically the angle between the axis of the spring 540 and the length direction of the first connecting arm 300.

When the height of the display is adjusted, the connector 200 is raised or lowered relative to the base 100, so that the positions of the third hinge point 210 and the fourth hinge point 220 relative to the first hinge point 110 and the second hinge point 120 are changed, thereby the first connecting arm 300 rotates around the first hinge point 110, and the second connecting arm 400 rotates around the second hinge point 120, during which the length of the linkage rod 550 does not change, and therefore, the movable portion 560 moves relative to the first connecting arm 300 along the direction limited by the linkage rod 550, so that the length of the spring 540 changes, so that the elastic force generated by the spring 540 can be balanced with the gravity of the display, and the display can freely hover at each height position.

Further, the first end of the rod body of the linkage rod 550 is hinged with the second hinge point 120. From this, make the second link arm 400 and the body of rod be connected to the second pin joint 120 on the base 100 jointly to improved the utilization ratio of pin joint, need not to set up extra pin joint for the gangbar 550 alone promptly, and then be favorable to practicing thrift the processing cost.

In some embodiments, the movable portion 560 and the rod body may be a single structure, that is, the rod body 560 is formed by machining the movable portion 560 simultaneously, and the two are integrated. In other embodiments, the movable portion 560 and the rod body may be a separate structure, i.e. they are formed separately and are connected together by assembling.

Further, the movable portion 560 may be a slide shaft, a roller, a wheel, or the like provided at the second end of the rod body. When the movable portion 560 is a slide shaft, the movable portion 560 moves in a sliding manner with respect to the first connection arm 300. When the movable portion 560 is a roller or a wheel, the movable portion 560 moves in a rolling manner with respect to the first connecting arm 300, which is advantageous for reducing the friction force when the movable portion 560 slides with respect to the first connecting arm 300, thereby making the movement of the movable portion 560 smoother.

In some embodiments, the guide portion 310 is disposed on the first connecting arm 300, at least a portion of the structure of the movable portion 560 is limited to the guide portion 310, and the guide portion 310 can limit the moving direction of the movable portion 560, that is, the movable portion 560 needs to slide along the guide portion 310, which is more beneficial to ensure that the spring 540 is at a fixed included angle with respect to the first connecting arm 300, so as to prevent the spring 540 from being angularly displaced during the extension and retraction process.

It is understood that, in the above embodiments, the elastic force provided by the spring 540 may be a tensile force or a compressive force, and may be adaptively designed according to different acting positions of the elastic force, which is not limited by the present disclosure.

Further, the movable portion 560 may be connected to an end of the spring 540 near the connection head 200, and in other embodiments, the movable portion 560 may also be connected to an end of the spring 540 near the base 100. Specifically, in the case where the elastic force provided by the spring 540 is a tensile force, the movable portion 560 may be disposed at an end of the spring 540 near the connection head 200; in the case that the elastic force provided by the spring 540 is a pressure force, the movable portion 560 may be disposed at an end of the spring 540 close to the base 100. In both cases, the spring 540 may be extended or contracted to balance the elastic force with the gravity of the display.

Referring to fig. 4 and 5, in some other embodiments, the elastic member 510 includes a spring 540, and an angle between an axis of the spring 540 and the first connecting arm 300 is constant during the movement of the connecting head 200 from the high point to the low point or from the low point to the high point. The elastic assembly 500 further includes a flexible pulling member 570, one end of the flexible pulling member 570 is mounted to one end of the spring 540 near the connecting head 200, the other end of the flexible pulling member 570 is connected to the connecting head 200, and a guide member is disposed on the first connecting arm 300 or the second connecting arm 400, the guide member being configured to guide the flexible pulling member 570 during the movement of the flexible pulling member 570.

When the height of the display is adjusted, the connector 200 is raised or lowered relative to the base 100, so that the positions of the third hinge point 210 and the fourth hinge point 220 relative to the first hinge point 110 and the second hinge point 120 are changed, thereby the first connecting arm 300 rotates around the first hinge point 110, and the second connecting arm 400 rotates around the second hinge point 120, during which the stress state of the spring 540 changes, and the length of the spring changes under the pulling of the flexible traction member 570, so that the elastic force generated by the spring 540 can be balanced with the gravity of the display again when the display is at a new height position. Based on the principle, the display can achieve a free hovering state at each height position. In addition, the guide part is arranged on the first connecting arm 300 or the second connecting arm 400, and in the process that the flexible traction part 570 moves due to the length change of the spring 540, under the guiding action of the guide part, the direction of the traction force applied to the spring 540 by the flexible traction part 570 can be ensured to be collinear with the axial direction of the spring 540, so that the included angle between the elastic member 510 and the first connecting arm 300 is favorably ensured to be constant.

Further, the flexible pulling member 570 may be a pulling rope, a pulling strap, or the like.

In some embodiments, the guide is a pulley 320 and the flexible traction member 570 is tensioned against the pulley 320. The pulley 320 is used as a guide member, on one hand, the flexible traction member 570 can be guided in a movement manner, on the other hand, the flexible traction member 570 can move more smoothly, and friction between the flexible traction member 570 and the guide member in the movement process is avoided, so that the flexible traction member 570 is prevented from being rubbed.

In other embodiments, the guide member is a tube structure through which the flexible pulling member 570 passes. In particular, the flexible pulling member 570 has a gap with the wall of the tube structure to enable the flexible pulling member 570 to move relative to the tube structure. Wherein the axis of the tube structure is in a collinear relationship with the spring 540, thereby advantageously ensuring that the angle between the resilient member 510 and the first connecting arm 300 remains constant.

In other embodiments, the guide member is a slotted structure through which the flexible pulling member 570 passes. Specifically, the flexible pulling member 570 has a gap with the inner wall of the slot structure to enable the flexible pulling member 570 to move relative to the slot structure. Wherein the center of the groove structure may be on the extension line of the axis of the spring 540, thereby being beneficial to ensure that the included angle between the elastic member 510 and the first connecting arm 300 is kept constant.

In some embodiments, the elastic member 510 further includes a screw 520 and a first threaded sleeve 530, the first threaded sleeve 530 is fixedly connected to the spring 540, and the screw 520 is threadedly engaged with the first threaded sleeve 530. The relative position of the first thread bushing 530 and the screw 520 can be adjusted by rotating the screw 520, so that the end position of the spring 540 is changed, the initial length of the spring 540 is adjusted, and the bearing capacity of the spring 540 is changed, thereby facilitating the adjustment of the bearing capacity of the spring 540, and enabling the elastic force provided by the spring 540 to reach a force balance state with displays of different weights.

Further, the screw 520 may be hinged with the first hinge point 110. In the process of adjusting the height of the display, the first connecting arm 300 rotates around the first hinge point 110, so that the screw 520 is hinged to the first hinge point 110, which is beneficial to the screw 520 and the first connecting arm 300 to synchronously rotate, so as to keep the included angle between the screw 520 and the first connecting arm 300 unchanged, and further keep the included angle between the spring 540 and the first connecting arm 300 fixed.

Specifically, the rotating shaft 521 may be sleeved on the screw 520, and the rotating shaft 521 is perpendicular to the screw 520, and the screw 520 is further rotatably mounted on the first hinge point 110 through the rotating shaft 521.

Further, the screw 520 is rotatably mounted to the first connecting arm 300 about its axis, so that the relative position of the first threaded sleeve 530 and the screw 520 can be adjusted by rotating the screw about its axis.

Referring to fig. 4, in some embodiments, the elastic assembly 500 may further include a second threaded sleeve 580 based on the case that the elastic assembly 500 further includes a flexible pulling member 570 and a guiding member, the second threaded sleeve 580 is installed at an end of the spring 540 far from the screw 520, and an end of the flexible pulling member 570 is connected to the second threaded sleeve 580. In this embodiment, the second thread sleeve 580 is used as a connecting member between the spring 540 and the flexible pulling member 570, which is more beneficial to ensure that the connecting portion of the flexible pulling member 570 and the spring 540 is located at the center of the spring 540, and further ensure that the spring 540 is not easily deflected when being stretched or compressed.

Referring to fig. 2 and 4, in some embodiments, the first connecting arm 300 includes a first housing 330 and a second housing 340, the first housing 330 and the second housing 340 being fastened together in an opposing manner to define a receiving cavity; the second connecting arm 400 and the elastic member 500 are disposed in the receiving chamber. In this embodiment, the first connecting arm 300 is in the form of a housing, so that a space is provided for the elastic member 500, and the second connecting arm 400 can be disposed in the receiving cavity, so that the user does not see the elastic member 500 and the second connecting arm 400, thereby making the display stand neat and beautiful in appearance. In addition, the first connecting arm 300 serves as a housing structure covering the elastic assembly 500 and the second connecting arm 400, and also can protect the elastic assembly 500, thereby preventing the elastic assembly 500 from being collided and being beneficial to dust prevention and water prevention.

Further, the first housing 330 and the second housing 340 may be connected by a connecting member or a snap-fit structure, which is not particularly limited in this embodiment.

Referring to fig. 2-5, in some embodiments, a panel assembly 600 is mounted on the connecting head 200, and the panel assembly 600 is used for mounting a display. The panel assembly 600 may be mounted on the connection head 200 by bolts, clamping, and the like, which is not limited in this embodiment.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

All the embodiments of the present disclosure are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.

The above description is only for the preferred embodiment of the present disclosure, and is not intended to limit the scope of the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure are included in the scope of protection of the present disclosure.

Claims

1. A display stand, comprising:

the hinge comprises a base, a hinge joint and a hinge joint, wherein the base is provided with a first hinge joint and a second hinge joint;

the connector is used for mounting a display, and a third hinge point and a fourth hinge point are arranged on the connector;

a first end of the first connecting arm is hinged to the first hinge point, and a second end of the first connecting arm is hinged to the third hinge point;

the first end of the second connecting arm is hinged to the second hinge point, the second end of the second connecting arm is hinged to the fourth hinge point, and the first hinge point, the second hinge point, the third hinge point and the fourth hinge point form a quadrilateral structure with the first connecting arm and the second connecting arm;

the elastic assembly is configured to balance the gravity of the display and comprises an elastic member for providing elastic force, and an included angle between the elastic member and the first connecting arm is fixed and unchanged in the process that the connecting head moves from a high point to a low point or from the low point to the high point.

2. The monitor stand of claim 1, wherein the resilient member comprises a spring, an angle between an axis of the spring and the first connecting arm is constant during movement of the connector from a high point to a low point or from a low point to a high point;

the elastic component further comprises a linkage rod, the linkage rod comprises a rod body and a movable portion, the movable portion is arranged on the rod body, the first end of the rod body is hinged to the base, the movable portion is arranged at the second end of the rod body, the movable portion is connected with the first connecting arm in a movable mode, and the end portion of the spring is connected with the movable portion.

3. The monitor stand of claim 2, wherein a first end of the rod body of the linkage rod is hinged to a second hinge point.

4. The monitor stand of claim 2, wherein the movable portion is of a one-piece or split construction with the rod.

5. The monitor stand of claim 2, wherein the movable portion is a slide, roller or wheel disposed at the second end of the rod.

6. The monitor stand according to claim 2, wherein a guide portion is provided on the first connecting arm, at least a part of the movable portion being restricted to the guide portion.

7. The monitor support according to claim 2, wherein the movable portion is connected to an end of the spring near the connector, or the movable portion is connected to an end of the spring near the base.

8. The monitor stand of claim 1, wherein the resilient member comprises a spring, an angle between an axis of the spring and the first connecting arm is constant during movement of the connector from a high point to a low point or from a low point to a high point;

elastic component still includes flexible traction piece and guide, the one end of flexible traction piece install in being close to of spring the one end of connector, the other end of flexible traction piece is connected the connector, the guide sets up on first linking arm or the second linking arm, the guide is configured to be in flexible traction piece motion in-process is right flexible traction piece leads.

9. The display stand of claim 8, wherein the flexible traction member is a traction cord.

10. The monitor support according to claim 8, wherein the guide member is a pulley, and the flexible traction member is tensioned to the pulley;

or, the guide part is a tube structure, and the flexible traction part passes through the tube structure;

or, the guide part is of a groove structure, and the flexible traction part penetrates through the groove structure.

11. The monitor support according to any one of claims 2 to 10, wherein the elastic member further comprises a screw rod, a first threaded sleeve and a rotating shaft, the first threaded sleeve is fixedly connected to the spring, the screw rod and the first threaded sleeve are in threaded fit, the rotating shaft is sleeved on the screw rod, and the screw rod is rotatably mounted to the first hinge point through the rotating shaft.

12. The display stand of any one of claims 1 to 10, wherein the first connecting arm comprises a first housing and a second housing that snap together in an opposing manner to define a receiving cavity;

the second connecting arm and the elastic component are arranged in the accommodating cavity.