JP3242335B2 - Electronic equipment housing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device housing installed on an indoor wall, for example.

[0002]

2. Description of the Related Art A system for centrally monitoring security monitoring information of a tenant building or the like using a telephone line is known. FIGS. 8A and 8B are a front view and a side sectional view showing an external appearance of an example of an electronic apparatus housing used as a terminal device of this type of system. In this case, the electronic device housing is, for example, a base 1 made of synthetic resin.
And a cover 2.

In this electronic apparatus housing, a housing 1a for an electronic circuit portion of a base 1 is embedded in a wall 3 at a predetermined place indoors as shown in FIG. 3 and attached by screwing. Then, a flat cover 2 is fixed to the base 1 with screws or the like so as to protect the electronic circuit portion 4 in the storage section 1a.

In this case, electronic parts such as various alarm lamps are attached to the cover 2 and the storage unit 1a is provided.
It is electrically connected to the electronic circuit part by a cable.

[0005]

In the maintenance and inspection of this kind of electronic equipment, it is necessary to remove the cover 2 from the base 1 and carry out the work. Since the conventional electronic device housing has the above-described structure, as shown in FIG. 8A, the user removes the cover and shifts the cover to expose the electronic circuit portion of the base to perform the operation. I have.

At this time, the cover 2 is hung by the cable with respect to the base 1, so that a load is applied to the cable and the connection point, and the workability is poor.

In view of the above, an electronic device housing is conceivable in which the cover 2 is rotatably attached to the base 1 so that a load is not applied to cables and connection points, and the workability of maintenance work can be improved. However, at this time, if the cover 2 is simply made rotatable with respect to the base 1, the cover 2
However, since it is pivotally returned to the base 1 side by its own weight, it becomes necessary for the operator to perform work while supporting the cover.

In view of the above, the present invention provides an electronic device in which a cover is rotatably mounted on a base and the cover can be held in a state of being rotated by approximately 90 degrees with respect to the base. An object of the present invention is to realize a device housing with a configuration as simple as possible.

[0009]

In order to solve the above-mentioned problems, an electronic apparatus housing according to the present invention has an opening on one surface side corresponding to the reference numerals of respective parts in the embodiments described later, and the inside thereof has an opening. It has a space 11a for accommodating an electronic device, has a base 11 attached to a wall surface, and has a cover surface 12a for closing an opening of the base 11, and has upper and lower left and right ends when attached to the wall of the base 11. In such a state, it is rotatably attached to the base 11 with the direction along the left-right direction as the rotation axis direction, so that the opening of the base 11 is closed and the inside of the base 11 is exposed to the outside. An electronic device housing comprising:
In the middle of the cover 12 in the left-right direction near the rotation axis position of the cover 12, the base 11
The cover comprises a plate-like body formed integrally, and the cover is
The cover surface when the opening of the case is closed.
It has a parallel plate surface, and has an elasticity in a direction perpendicular to the plate surface.
One end of the plate-like body is a free end so that it can be displaced
Open state maintaining members 17L and 17R are provided, and the open state is maintained by the edge of the side plate 12c of the cover 12 when the cover 12 rotates with respect to the base 11.
When the members 17L and 17R are elastically biased in the wall direction and the cover 12 is rotated by approximately 90 degrees with respect to the base 11, the outer side surface of the side plate 12c of the cover 12 is in the open state. Of the maintenance members 17L, 17R
And abutting state of the plate surface and the surface contact, the cover 12
But it is characterized in that so as to prevent the pivoting return to the opening side of the base 11 by its weight.

The base 11 is located near the rotational axis position of the cover and at the intermediate portion in the left-right direction, and further in a direction substantially orthogonal to the cover surface 12a.
A convex portion 20 provided so as to protrude to the side is provided, and an abutment member 30 is provided on the base 11 corresponding to the convex portion 20, and the first convex portion is connected to the cover surface. Edge 24 and a second distance from the cover surface.
, And an arcuate edge 26 connecting the first and second edges. The distance from the rotation axis position of the cover to the second edge is a predetermined distance d2. The distance d3 from the rotation axis position of the cover to the arc-shaped edge is set to be greater than the distance d2, and the abutment member is erected from the base surface 11b parallel to the wall surface. And the distance d2 from the rotation axis position of the cover.
And a surface 30a at a position separated by a distance d4 that satisfies d4 <d3, and comprises an abutment plate 30 that can be elastically displaced.

[0011]

According to the present invention having the above-described structure, when the cover is pivoted in the opening direction about the pivot axis, the convex portion of the cover is brought into contact with the abutment plate constituting the abutment member of the base. First
The arc-shaped edge abuts following the edge of the projection, and the distance d3 between the arc-shaped edge and the rotation axis position is larger than the distance d4 between the abutment plate and the rotation axis position. The arcuate edge elastically biases the abutment plate. The operator can rotate the cover in the opening direction against the pressing bias force.

Then, when the cover is rotated by about 90 degrees, the abutment plate is in a state of facing the second edge of the convex portion. Since the distance d2 between the second edge and the rotation axis position is substantially equal to the distance d4 between the abutment plate and the rotation axis position, the abutment plate and the second edge of the convex portion are inelastic. A state of collision or contact with This condition serves to prevent the cover from rotating in the direction of the base due to its weight.

When the cover is rotated by approximately 90 degrees with respect to the base, the side surface of the cover and the abutment surface of the open state maintaining member abut in a state of surface contact. This abutment condition prevents the cover from naturally returning to the opening side of the base due to its weight.

Therefore, the sum of the force by which the arc-shaped edge of the convex portion elastically presses and biases the abutment plate and the force by which the abutment surface of the open state maintaining member elastically presses and biases the side surface of the cover. As long as no closing force acts on the cover against the force, the cover maintains this 90 degree open state.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an electronic apparatus housing according to an embodiment of the present invention applied to a wall-embedded electronic apparatus housing.

The electronic device housing 10 of this embodiment includes a base 11 and a cover 12. As shown in FIGS. 1 and 2, the base 11 has a housing recess 11 a for housing the electronic circuit portion, and a flange provided on the opening end side of the housing recess 11 a and serving as a surface along the wall when attached to the wall. Part 11b
Is provided. The cover 12 has a cover surface 12a that covers the opening side of the storage recess 11a. Then, the cover 12 moves the left and right sides of the base 11 on the upper side when the electronic device housing 10 is attached to the wall 3 with respect to the base 11 in a direction along the left-right direction with respect to the rotation axis Rz. It is mounted so that it can rotate in the vertical direction.

FIG. 1 is a perspective view showing a state in which the cover 12 is rotated by 90 degrees with respect to the base 11. FIG. 2A
Shows a state in which the electronic device housing 10 is attached to the wall 3, and FIG. 2B is a front view of the electronic device housing 10 when the cover 12 is closed.

As shown in FIG. 2A, when the electronic device housing 10 of this embodiment is mounted on the wall 3, the housing recess 11 a of the base 11 is housed in a hole formed in the wall 3, and The flange 11 b is pressed against the wall 3. Then, through holes 11c to 11 provided in the flange 11b.
The electronic device housing 10 is attached to the wall by fixing the base 11 to the wall 3 with screws or the like via f.

FIG. 3A is a view showing a portion of the base 11 connected to the cover 12 when the base 11 is viewed from the opening side. FIG. 3C is a sectional view taken along line XX.

The cover 12 is formed in a thin box shape having a U-shaped cross section and an opening 12b on one side as shown in FIG. 3B and FIG. And a cover surface 12a for closing the opening of the storage recess 11a. FIG. 3B and FIG.
FIG. 2 shows a state in which 2 is opened 90 degrees with respect to the base 11.

As shown in FIGS. 3A and 3C, the upper and lower left and right ends of the base 11
However, when this is attached to the wall 3, there are provided rotation support plates 13L and 13R which are planted from the flange portion 11b along the wall surface. 3A, the rotation support plates 13L and 13R correspond to the rotation axis R of the cover 12 indicated by a dashed line.
a plane orthogonal to the direction of z, and the plane has pins 14L and 14R serving as rotation axes of the cover 12, respectively.
Is provided. That is, these pins 14L and 14R
Is the rotation axis Rz.

On the other hand, at the upper and lower ends on the right side in the width direction corresponding to the cover 12, there are formed concave holes 15L and 15R to be fitted with the pins 14L and 14R. Since the rotation support plates 13L and 13R can elastically bend in the direction of the rotation axis Rz, the pins 14L and 14R are fitted into the concave holes 15L and 15R of the cover 12, and the cover The base 12 can be attached to the base 11 so as to be rotatable about a rotation axis Rz.

In this embodiment, when the cover 12 is rotated by 90 degrees or more with respect to the base 11 on the surface of the cover 12 on which the concave holes 15L and 15R are provided, The lock bosses 16L and 1L formed of, for example, mountain-shaped projections for preventing the base from being easily closed to the base 11 from the 90-degree rotation position.
6R are provided.

The turning operation of the cover 12 in the turning portion by the engagement between the portions of the rotation support plates 13L and 13R of the base 11 and the recesses 15L and 15R of the cover 11 will be described. 4A, 4B, and 4C, which are cross-sectional views taken along a line A (the same as the line AA in FIG. 3).

FIG. 4A shows the state of the rotating part when the cover 12 is closed with respect to the base 11 and the opening of the base 11 is closed. At this time, as illustrated, the lock bosses 16L and 16R do not abut against the rotation support plates 13L and 13R. At this time, the cover 12 is
A locking screw (not shown) is screwed into a screw hole 19 of the base 11 shown in FIG. 2B through a through hole (not shown) provided in the cover 12, whereby the base 11 is locked with respect to the base 11. Not to open.

In this state, when the locking screw is removed and the cover 12 is rotated about the rotation axis Rz, the lock bosses 16L and 16R are rotated by the rotation support plates 13L and 13L.
4B, but if the operator continues to forcibly rotate, the lock bosses 16L and 16R are rotated by the rotation support plates 13L and 13R as shown in FIG. 4B.
With the pins 14L and 14R and the recesses 15L and 15L.
The cover 12 rotates while the bias is depressed to such an extent that the engagement with R is not released.

Then, when the cover 12 is turned by 90 degrees or more and the state shown in FIG.
Since 6L and 16R are released from the state where the rotation supporting plates 13L and 13R are depressed and biased, the rotation supporting plate 13L
And 13R elastically return to their original positions. Therefore, when the cover 12 attempts to rotate in the closing direction, the lock bosses 16L and 16R abut against the rotation support plates 13L and 13R, and unless the cover 12 is forcibly rotated in the closing direction by a predetermined force. Maintains an open state with respect to the base 11 for 90 degrees or more.

However, as a means for preventing the cover 12 from rotating in a direction in which the cover 12 naturally closes due to its weight from the open state of the cover 12 at approximately 90 degrees, the lock boss 1 is used.
Although 6L and 16R are used, this is not complete.

Therefore, in this embodiment, FIG.
As shown in FIG. 3 and FIG.
b, in the vicinity of the position of the rotation axis Rz, and at two positions in the middle of the direction of the rotation axis Rz, an L-shaped flange 1 is provided.
Elastic plate members 17L and 17R are provided from the plate surface of 1b. The elastic plate members 17L and 17R are formed of resin integrally with the base 11.

FIG. 5A is a cross-sectional view taken along the line BB in FIG. 3 in a state where the cover 12 is closed on the base 11. The elastic plate members 17L and 17R extend in a direction parallel to the plate surface of the flange portion 11b, and a plate portion 172 that is erected perpendicularly from the plate surface of the flange portion 11b. And an elastic biasing plate 171 having a shape curved toward the flange 11b.

A rectangular through hole 11c, which is slightly larger than the shape of the elastic plate members 17L, 17R, is formed in the flange 11b at the position where the elastic plate members 17L, 17R are formed. Therefore, the elastic biasing plates 17 of the elastic plate members 17L and 17R
1 is pushed toward the flange 11b, the elastic biasing plate 17
1 can freely bend toward the flange 11b due to the presence of the space in the through hole 11c. The elastic plate member 17L,
The length of the plate portion 172 of the 17R can be set longer, and the bias of the elastic bias plate 171 causes the elastic bias plate 171 to
When it does not hit 1b, there is no need to provide the through hole 11c.

In this case, the height position of the upper surface of the elastic biasing plate 171 in the direction perpendicular to the plate surface of the flange portion 11b is such that when the cover 12 is turned by 90 degrees, the upper side plate 12
The outer side surface of the elastic biasing plate 171 and the upper surface of the elastic biasing plate 171 are selected so as to be in contact with each other (see FIG. 5C). That is, as shown in FIG. 5A, when the distance between the position of the rotation axis Rz and the outer surface of the side plate 12c of the cover 12 is t, the position of the upper surface of the elastic biasing plate 171 and the position of the rotation axis Rz. The distance in the direction perpendicular to the plate surface of the flange 11b is also set to t. With this configuration, the elastic plate members 17 </ b> L and 17 </ b> R including the elastic biasing plate 171 function as members for maintaining the cover 12 in the open state.

With this configuration, when the cover 12 is rotated so that the opening side of the base 11 is exposed, as shown in FIG. Of the elastic plate members 17L, 17R
The elastic biasing plate 171 is connected to the through holes 18L and 18R of the flange 11b.
Bias inward. At this time, the elastic biasing plate 171
Since it acts to bias the cover 12 in the direction to close the opening on the base 11 side, the operator needs to rotate the cover 12 with a force that opposes the biasing force. This works with the above-described action of the lock bosses 16L and 16R, as well as an appropriate pressure when the cover 12 is opened.

When the cover 12 is further rotated in the opening direction than the state shown in FIG.
The edge of 2c gradually moves the curved portion on the distal end side of the elastic biasing plate 171 of the elastic plate members 17L and 17R toward the storage recess 11a, and from a certain rotation angle position, the elastic biasing plate 171
It serves to bias the cover 12 in the opening direction. And
At the 90-degree rotation position shown in FIG. 5C, the outer peripheral surface of the side plate 12c of the cover 12 and the upper surface of the elastic biasing plate 171 are brought into surface contact and abut against each other. In the 90-degree rotation position, the inner peripheral surface of the side plate 12c of the cover 12 is opposed to the flange 11b of the L-shaped rotation support plates 13L and 13R (FIG. 3C). And the cover 12 does not rotate any further.

In the state shown in FIG. 5C, as described above,
The outer peripheral surface of the side plate portion 12c of the cover 12 and the elastic bias plate 1
Since the upper surface of the cover 71 is in surface contact with and abuts against the cover 71, to rotate the cover 12 in the closing direction from this state,
The cover 1 is forcibly forced by the force to release the surface contact abutment state.
It is necessary to return the state in which the edge of the side plate 12 c of the cover 12 rides on the upper surface of the elastic biasing plate 171 by rotating the cover 2. This force is relatively large, so that the cover 12
Keeps the open state at 90 degrees stable.

In this embodiment, the rotation axis Rz
The distance between the position of the cover 11 and the cover surface 12b of the cover 12 is also set to t, so that even if the cover 12 is rotated 90 degrees, as shown in FIG.
The cover surface 12b does not protrude outside the tip of 1b. Therefore, when a plurality of electronic device casings 10 of this embodiment are arranged side by side in the vertical direction of the wall surface, the electronic device casing 1
There is almost no need to provide a vertical gap between zeros, which saves installation space.

Further, in this embodiment, FIG.
As shown in FIG. 3A, a convex portion 20 is provided near the position of the rotation axis Rz and substantially at the center of the upper surface of the cover 12 in the direction of the rotation axis Rz.
An abutment plate 30 is provided in the portion of the flange 11b.

FIG. 6 is a sectional view of the structure of the convex portion 20 and the abutment member 30 taken along the line CC in FIG. 2B (equivalent to the line CC in FIG. 3A). And FIG.
This will be described below with reference to FIG.

First, the convex portion 20 provided on the cover 12
Will be described.

In this embodiment, the projection 20
Is a predetermined thickness, two plate-shaped convex bodies 21 and 22 having the same shape are planted from both sides of the side plate 12c and the cover surface 12b in a direction perpendicular to each surface, The plate-shaped convex bodies 21 and 22 are connected by a reinforcing plate 23. The distance between the two plate-shaped convex bodies 21 and 22 in the direction of the rotation axis Rz is selected to be W1 as shown in FIG. 3B.

As shown in FIG. 6B, each of the two plate-like convex bodies 21 and 22 is connected to the cover surface 12b and has a linear first edge 24 perpendicular to the cover surface 12b.
And a second linear edge 25 at a position separated from the cover surface 12b and parallel to the cover surface 12b, and an arc-shaped edge connecting the first edge 24 and the second edge 25. Edge 26.

The distance d1 from the rotation axis Rz position of the cover 12 to the first edge 24 and the second edge 25
The distance d2 to is set to d1 ≦ d2. Also,
The distance d3 from the rotation axis Rz position of the cover 12 to the third edge 26 is selected as d3> d2.

On the other hand, the abutment plate 30 is
1b, a surface 30a parallel to the direction of the rotation axis Rz of the cover 12 is provided. This surface 30a and the rotation axis Rz
The distance d4 to the position is substantially equal to the distance d2 and d
4 <d3 is selected.

The flange 11b of the base 11 of the abutment plate 30
Is a position corresponding to the position of the convex portion 10 of the cover 12. Then, as shown in FIG. 3A, the distance W2 of the surface 30a in the direction of the rotation axis Rz is wider than the distance W1 of the convex portion 20, and the distance W2 includes the distance W1. The abutment plate 30 is provided at such a position.

The relationship between the protruding portion 20 and the abutment plate 30 during the rotation of the cover 12 is defined by the position of the line CC in FIG. 2B (the position of the line CC in FIG. 3A). FIG. 7 is a sectional view of FIG.
This will be described with reference to FIG.

When the cover 12 is closed and the opening of the base 11 is closed, the relationship between the convex portion 20 and the abutment plate 30 is as shown in FIG. 7A. That is,
In this state, the first edges 24 of the protruding plate-like bodies 21 and 22 of the protruding portion 20 and the surface 30a of the abutment plate 30 are in contact with each other or with a slight gap therebetween.

Next, when the cover 12 is rotated in the opening direction from the base 11, the relationship between the convex portion 20 and the abutment plate 30 is as shown in FIG. 7B. In other words, in this state, the arcuate edges 26 of the protruding plate-like bodies 21 and 22 of the protruding portion 20 cause the abutment plate 30 to be deflected in the direction of the arrow 40 shown in the drawing.

In the case of this embodiment, the cover 1
Abutment plate 30 of convex plate-like bodies 21 and 22 of second convex portion 10
In the section from the first edge 24 to the center of the arcuate edge 26, the abutting portion acts on the cover 12 in a direction in which the cover 12 is closed. The cover 12 can be opened by forcibly rotating in the direction of the arrow 41 with a force opposing the biasing force of 30.

Then, by forcible rotation of the operator,
When the abutting portions of the convex portions 20 and 22 of the convex portions 20 and 22 of the cover 12 and the abutment plate 30 move from the arc-shaped edge 26 to the second edge 25, the abutment plate 30 Since the biasing force acts in a direction to open the cover 12, the rotation of the cover 12 becomes light.

The cover 1 of the abutment plate 30 at this time is
7C, the surface 12a of the abutment plate 30 is brought into contact with the second edge 25 of the protruding plate-like bodies 21, 22 as shown in FIG. Movement stops.

Next, when the cover 12 is rotated in the closing direction from the open state of FIG.
In a section in which the abutting portions of the 0 convex plate-like bodies 21 and 22 with the abutment plate 30 extend from the second edge 25 to the center of the arc-shaped edge 26, the biasing force of the abutment plate 30 is: Since the cover 12 operates in the opening direction, the cover 12 cannot be closed unless the cover 12 is forcibly rotated with a force opposing this.

Therefore, according to the electronic device housing of the above-described embodiment, the convex portion 20 and the abutment plate 30 also
With the cover 12 opened 90 degrees with respect to the base 11,
The function of securely holding is made to work.

Although the protruding portion 20 is constituted by a plurality of plate-like members, it may be constituted by a single thick plate-like member.

[0054]

As described above, according to the electronic device housing of the present invention, the cover can be reliably held in a state where the cover is rotated by 90 degrees with respect to the base.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating the configuration of an embodiment of an electronic device housing according to the present invention.

FIG. 2 is a front view and a side view of an embodiment of an electronic device housing according to the present invention.

FIG. 3 is a diagram illustrating a configuration example of a main part of an embodiment of an electronic device housing according to the present invention.

FIG. 4 is a view for explaining an operation of a pivoting portion of a main part of the electronic apparatus housing according to one embodiment of the present invention;

FIG. 5 is a diagram illustrating locking of the electronic device housing according to the embodiment of the present invention in a 90-degree opened state.

FIG. 6 is a diagram for explaining a main part of an embodiment of an electronic device housing according to the present invention.

FIG. 7 is a diagram for explaining locking of the electronic device housing according to the embodiment of the present invention in a 90-degree opened state.

FIG. 8 is a diagram illustrating a conventional electronic device housing.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 electronic device housing 11 base 11a base storage recess 11b base flange 12 cover 12b cover surface 12c cover side plate 13L, 13R rotation support plate 16L, 16R lock boss 17L, 17R elastic plate member 171 elastic bias plate 20 convex Parts 21, 22 Convex Plate 24 First Edge 25 Second Edge 26 Arc Edge 30 Impact Plate

Claims (3)

(57) [Claims] An opening is provided on one side of the base, and a space for accommodating an electronic device is provided in the opening, a base attached to a wall surface, and a cover surface for closing an opening of the base is provided. A state in which the base is rotatably attached to the base at the left and right upper ends when mounted on a wall with a direction along the left-right direction as a rotation axis direction to close the opening of the base; An electronic device housing including a cover that is rotated to expose the inside to the outside, wherein the base has an intermediate portion in the left-right direction near the rotation axis position of the cover. In one, the base
A plate-like body formed on the body, wherein the cover is
The cover surface is almost flat when the
With a flat plate surface and elastic in the direction perpendicular to the plate surface
One end of the plate-like body is a free end so that it can be displaced.
A state maintaining member is provided, and when the cover rotates with respect to the base, the open state maintaining member is elastically biased toward the wall surface by the edge of the side plate portion of the cover. In addition, when the cover is rotated by approximately 90 degrees with respect to the base, the outer side surface of the side plate portion of the cover is the outer surface of the open state maintaining member.
And abutment in the form of a plate surface and the surface contact, said cover, electronics enclosure, characterized in that so as to prevent the pivoting return to the opening side of the base by its weight. 2. A position near the rotation axis of the cover and in the middle portion in the left-right direction, which is different from the position of the open-state maintaining member of the base, and is substantially opposite to the cover surface. In a direction orthogonal to the base, a convex portion is provided so as to protrude toward the base, and an abutment member is provided on the base corresponding to the convex portion, and the convex portion is provided on the cover surface. , A second edge at a position separated from the cover surface, and an arc-shaped edge connecting the first and second edges, and a rotation axis of the cover. The distance from the position to the second edge is a predetermined distance d2, and the distance d3 from the rotational axis position of the cover to the arc edge is the distance d2.
The abutment member is set up from the surface of the base parallel to the wall surface, and is substantially equal to the distance d2 from the rotation axis position of the cover, and satisfies d4 <d3. 2. The electronic device housing according to claim 1, wherein the electronic device housing has a surface at a position separated by d4 and is made of an abutment plate that can be elastically biased. 3. An opening having an opening on one surface side, a space for accommodating an electronic device therein, a base attached to a wall surface, and a cover surface for closing an opening of the base, wherein the base has an opening. A state in which the base is rotatably attached to the base at the left and right upper ends when mounted on a wall with a direction along the left-right direction as a rotation axis direction to close the opening of the base; An electronic device housing provided with a cover that is turned so that the inside is exposed to the outside, wherein the cover is located near the turning axis position of the cover and at the intermediate position in the left-right direction. A convex portion is provided so as to protrude toward the base in a direction substantially perpendicular to a surface, and an abutment member is provided on the base corresponding to the convex portion; Is before A first edge continuous with the cover surface; a second edge separated from the cover surface; and an arc-shaped edge connecting the first and second edges. The distance from the rotation axis position to the second edge is a predetermined distance d2, and the distance d3 from the rotation axis position of the cover to the arc edge is the distance d2.
The abutment member is set up from the surface of the base parallel to the wall surface, and is substantially equal to the distance d2 from the rotation axis position of the cover, and satisfies d4 <d3. 2. The electronic device housing according to claim 1, wherein the electronic device housing has a surface at a position separated by d4 and is made of an abutment plate that can be elastically biased.