KR101659957B1

KR101659957B1 - Refrigerator having sliding door

Info

Publication number: KR101659957B1
Application number: KR1020150060250A
Authority: KR
Inventors: 유세연; 유지연; 현정훈
Original assignee: 재단법인 동부문화재단
Priority date: 2015-04-29
Filing date: 2015-04-29
Publication date: 2016-09-27

Abstract

A refrigerator having a sliding door is disclosed.
According to an embodiment of the present invention, there is provided a refrigerator comprising: a main body having a storage compartment; a first door portion and a second door portion which are slidably installed in front of the main body to open and close the storage compartment, And the two door portions are overlapped with each other so that the first door portion and the second door portion are provided with respective movement paths And a door for moving the door.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a refrigerator having a sliding door,

The present invention relates to a refrigerator having a sliding door and a method for opening and closing the refrigerator.

Generally, the refrigerator has at least two storage rooms divided vertically or horizontally, and one of the storage rooms can be used as a freezer for freezing foodstuffs according to a high-temperature environment maintaining a temperature of approximately -7 ° C or less , And the other one of the storage compartments may be used as a refrigerating compartment for storing foodstuffs according to a high-temperature environment maintained at about -4 ° C to 2 ° C.

The freezer compartment door and the refrigerator compartment door (hereinafter collectively referred to as "refrigerator door") are provided in the freezer compartment and the refrigerating compartment so that food items can be put into and taken out from the freezing compartment and the refrigerating compartment, .

Since the conventional refrigerator has a structure (a hinge structure) in which each refrigerator door rotates about a hinge axis, opening and closing of the refrigerator can be performed through an operation of closing the door.

However, since the conventional refrigerator is opened to the front and then rotated sideways with a certain radius of rotation after the refrigerator door is opened to the front, a space within the radius of rotation of the refrigerator door can not be placed in a so-called dead space Dead space "), and space utilization is deteriorated due to this dead space.

Particularly, the size of the refrigerator door is gradually increasing according to the recent trend of increasing the size of the refrigerator, so that the dead space due to the refrigerator door is also increasing. However, this causes problems that the refrigerator door can not be freely opened and closed in a narrow space, and the space utilization becomes worse.

In addition, the conventional refrigerator door having the hinged structure has a very large degree of outflow of cool air during opening and closing of the door. When the outflow of cool air from the refrigerator storage room increases, the power consumption is adversely affected and the electricity consumption increase and the service life of the refrigerator can be shortened have.

In addition, a disabled person using a wheelchair has a problem in that it is inconvenient to open and close a conventional refrigerator door having a hinged door structure, thereby limiting the use of the refrigerator.

Korean Patent Publication No. 10-2004-92150 (published on November 3, 2004)

An embodiment of the present invention is to provide a refrigerator having a sliding door capable of improving the open / close structure of the refrigerator door to reduce dead space, ultimately increasing the space utilization around the refrigerator door and installing the refrigerator in a narrow space.

Also, an embodiment of the present invention is to provide a refrigerator having a sliding door that can reduce the outflow of cold air from a refrigerator storage compartment.

In addition, embodiments of the present invention are intended to provide a refrigerator having a sliding door that allows a disabled person using a wheelchair to easily open and close.

In addition, embodiments of the present invention provide a method of opening and closing a refrigerator having a sliding door capable of reducing the dead space to increase the space utilization around the refrigerator door and installing the refrigerator in a narrow space.

According to an aspect of the present invention, there is provided a refrigerator comprising: a main body having a storage chamber; a first door portion and a second door portion that are slidably installed in front of the main body to open and close the storage chamber, Wherein the first and second door portions are slid toward each other and one of the door portions is protruded from the other door portion to stop the door portions so that the two door portions are overlapped with each other to provide the respective movement paths to the first door portion and the second door portion A refrigerator having a sliding door including a door moving means may be provided.

Wherein the door moving means is moved along the main rail portion which is disposed along the sliding direction of the first door portion or the second door portion and which is extended along the sliding direction of the first door portion or the second door portion, The bracket having the guide groove formed in the same direction and one end connected to the first door portion or the second door portion and the other end being slidably inserted into the guide groove so that the first door portion or the second door portion is opened And a connecting portion that protrudes the door portion, which is moved when the door portion starts moving, from the stopped door portion.

The door moving means may further comprise a movable section arranged parallel to the first rail part arranged in parallel with the main rail part and a protruding section arranged in a direction crossing the moving section, And a pivot arm hinged to the second rail part and the connecting part, one end of which is moved along the first rail part, and the other end of which is fitted to the second rail part and moves along the protruding section and the moving section have.

In addition, a tapered portion may be formed on the inner side of each of the boundary portions of the first door portion and the second door portion so that each door portion smoothly slides outwardly.

In addition, a sealing means for maintaining the airtightness of the storage compartment may be provided at least one of the main body and the inner side of the first and second door portions facing the main body.

The sealing means may be a gasket or a rubber magnet.

In addition, the storage room may be formed with a short-term storage unit, a medium-term storage unit, and an organ storage unit sequentially in order of the first opened portion along the opening direction of the first door unit and the second door unit.

In addition, at least one of the first door portion and the second door portion may be provided with a window portion which can be seen through the inside of the main body.

According to the embodiment of the present invention, the refrigerator door is slid in a sliding form in which the doors are overlapped with each other to reduce the dead space, thereby improving the space utilization around the refrigerator door and installing the refrigerator easily and conveniently in a small space.

Further, according to the embodiment of the present invention, the power consumption of the refrigerator can be reduced by reducing the outflow of cold air in the storage compartment.

In addition, according to the embodiment of the present invention, a disabled person using a wheelchair can easily open and close the refrigerator door by pushing the refrigerator door to the side, thereby improving the usability of the refrigerator.

1 is an external perspective view of a refrigerator having a sliding door according to an embodiment of the present invention;
FIG. 2 is a perspective view showing a state in which one door is partially opened in the refrigerator of FIG. 1;
Fig. 3 is a front view showing the inside of the main body of the refrigerator of Fig. 1,
FIG. 4 illustrates a door moving means applied to a refrigerator having a sliding door according to an embodiment of the present invention. FIG. 4 is a plan sectional view taken along line AA of FIG. 1,
FIG. 5 is a plan sectional view showing a state in which one door portion is opened in FIG. 4,
FIG. 6 is a plan sectional view showing a state in which one door portion is slid in FIG. 5,
FIG. 7 is an external perspective view of a refrigerator having a sliding door according to another embodiment of the present invention, which is provided with a door portion made of a material capable of penetrating the inside of the main body. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a configuration and an operation according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE INVENTION The following description is one of many aspects of the claimed invention and the following description may form part of the detailed description of the invention.

However, the detailed description of known configurations or functions in describing the present invention may be omitted for clarity.

While the invention is susceptible to various modifications and its various embodiments, it is intended to illustrate the specific embodiments and the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Terms including ordinals such as first, second, etc. may be used to describe various elements, but the elements are not limited by such terms. These terms are used only to distinguish one component from another.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. It will be understood that the terms such as "comprises" or "having" in this application are intended to specify the presence of stated features, integers, steps, operations, elements, parts or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, or combinations thereof.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a refrigerator having a sliding door according to an embodiment of the present invention, FIG. 2 is a perspective view illustrating a state in which one door is partially opened in the refrigerator of FIG. 1, In which a door is omitted.

1 to 3, a refrigerator 10 having a sliding door according to an embodiment of the present invention includes a main body 100, a first door 200 and a second door 300, And door moving means 400 may be included.

The meaning of one embodiment of the present invention is not limited to these configurations but includes these configurations basically, and may also include other configurations (for example, well-known technologies widely known in refrigerators) However, since the known technology may obscure the gist of the present invention, a detailed description thereof will be omitted.

The main body 100 may have a storage room 110 capable of storing food therein. The main body 100 may include a storage compartment 110 for storing food therein.

The storage room 110 may be divided into two or more separate compartments, if necessary, and may be classified into a freezer compartment, a refrigerating compartment, a vegetable storage compartment, and the like depending on the characteristics of food to be stored.

The shelf 101 can be installed in each of the storage rooms 110 so that a large amount of food can be stored while separating the food in the up and down direction and a partition (not shown) is provided for partitioning the food into left and right directions It is possible. The shelf 101 and the partition are provided in a detachable structure so as to be installed or removed as required by the user. The structure of the shelf 101 and the partition is generally known, and thus a detailed description thereof will be omitted.

Specifically, the main body 100 includes two storage compartments arranged in parallel in one direction (for example, a left-right direction when the main body is viewed from the front), and may have a plurality of compartmented food storage spaces.

The first door portion 200 and the second door portion 300 are slidably installed in front of the main body 100 to open and close the storage chamber 110 formed in the main body 100, Can be performed.

In the present embodiment, the storage room 110 is divided into left and right portions and used as a freezing room and a refrigerating room. In this case, when the main body 100 is viewed from the front, a freezing chamber may be formed on the left side of the main body 100 and a refrigerating chamber may be formed on the right side of the main body 100. In this case, And the second door part 300 may be a refrigerator door for opening and closing the refrigerator compartment. However, in order to facilitate understanding, for example, the freezer compartment and the refrigerating compartment may be exchanged in position, and the storage compartment may be provided with two freezing compartments or two refrigerating compartments, It can be selected appropriately.

As shown in FIG. 1, when both the first door 200 and the second door 300 are closed, the freezer compartment and the refrigerating compartment are both closed to save cold air. When the food stored in the freezing compartment is taken out, When the first door part 200 is slid toward the second door part 300 to open the freezer compartment and the food stored in the refrigerating compartment is taken out as shown in Figure 2, 1 door unit 200 so that the refrigerating compartment can be opened.

The door moving means 400 is configured to slide the first door portion 200 or the second door portion 300 toward each other (the other door portion), and the door moving means 400 may be installed to connect the first door part 200, the second door part 300 and the main body 100, respectively.

In this embodiment, a total of four door moving means 400 are provided on the upper and lower portions of the doors 200 and 300, respectively. However, the door moving means 400 is only an example, It can be increased or decreased appropriately.

The door moving unit 400 may be moved to the other door unit 300 where one door unit 300 is moved when the first door unit 200 or the second door unit 300 is slid According to the drawings, the first door part 200 and the second door part 300 may protrude forward so that the two door parts 200 and 300 are overlapped with each other. have.

Accordingly, since the first door 200 or the second door 300 is slid toward the other door portion that is stopped when the door is opened and does not protrude outside the body 100, 10) dead space can be reduced to improve space utilization.

Here, the door moving means 400 will be described in more detail with reference to FIGS. 4 to 6. FIG.

4 is a plan sectional view showing a door moving means 400 of a refrigerator having a sliding door according to an embodiment of the present invention in a state in which all of the door portions 200 and 300 are closed, 6 is a plan sectional view showing a state in which the one door unit 300 is slid in FIG. 5. FIG. 6 is a plan view of the door unit 300 shown in FIG.

4, the door moving means 400 may include a main rail 410, a bracket 420, and a connecting portion 430. In addition, a first rail 440, A second rail 450 and a pivot arm 460. [ In addition, the door moving means 400 may include a first rail 440, a second rail 450, and a pivot arm 460 in a basic configuration.

The main rail part 410 is disposed along the sliding direction of the first door part 200 or the second door part 300, The door unit can be supported with the strength and rigidity enough to bear the load of the first door unit 200 or the second door unit 300. [

The first door portion 200 and the second door portion 300 slide in the left and right direction of the main body 100 when the main body 100 is viewed from the front, In the left and right direction of the main body 100, at least one of the upper portion and the lower portion of the main body 100.

One end of the bracket 420 is coupled to the main rail 410 and moves along the main rail 410. The other end of the bracket 420 is connected to the first door 200 A guide groove 421 formed in the same direction as the protruding direction of the door portion 300 (for example, the front side of the main body 100) may be provided.

The connecting part 430 connects the first door part 200 or the second door part 300 with the bracket 420 to connect the first door part 200 or the second door part 300, And is configured to move sideways while projecting forward.

One end of the connecting portion 430 is connected to the first door portion 200 or the second door portion 300 and the other end of the connecting portion 430 is slidably inserted into the guide groove 421. [ (300 according to the drawing) moved so that the two door parts (200, 300) do not collide with each other when the first door part (200) or the second door part (300) Can protrude from the stopped door portion (according to the drawing contents 200) (see FIG. 5).

When the door moving means 400 is operated by the sliding action of the guide groove 421 of the bracket 420 and the connecting portion 430, the first door portion 200 or the second door portion When the user pulls out the door portion by pulling the first door portion 200 or the second door portion 300 to the front of the main body 100 and then the drawn-out door portion protrudes more than the other door portion, It must be pushed laterally to overlap the other door part.

The door moving means 400 further includes the first rail 440, the second rail 450 and the pivot arm 460 so that the door can be opened more easily and easily in the course of the series of processes .

The first rail 440 may be disposed in parallel with the main rail 410 in front of the main body 100.

In addition, the second rail 450 may have two sections separated by a moving section 451 and a protruding section 452, and may have a substantially L-shaped configuration. The movement section 451 is a part of the second rail 450 arranged in parallel to the first rail 440 and the projection section 452 is formed in a direction crossing the movement section 451 Or may be another portion of the second rail 450 being deployed. In the second rail 450, the movement section 451 and the protrusion section 452 may be connected to each other to communicate with each other.

The pivot arm 460 may be hinged to the connecting portion 430 to pivot about a hinge point of the connecting portion 430. One end of the pivot arm 460 may be pivotally connected to the first And can be moved along the first rail part 440 by being fitted in the rail part 440.

The other end of the pivot arm 460 is fitted in the second rail 450 and is engaged with the protrusion section 452 and the movement section 452 when the first door section 200 or the second door section 300 is opened. 451, respectively.

At this time, the first and second rails 440 and 450 are spaced apart from each other and one end and the other end of the pivot arm 460 are connected to the first rail 440 and the second rail 440, Since the door is slidably coupled to the second rail 450, the door is not disposed at right angles to the connecting portion 430 in a state where the door is closed as shown in FIG. 4, 5, the other end of the pivot arm 460 may be pivotally connected to the second rail part 450, as shown in FIG. 5, even though the second door part 300 does not apply a separate pulling force to the second door part 300, The connecting portion 430 is protruded from the guide groove 421 of the bracket 420 while the first door portion 200 or the second door portion 300 is protruded It can be moved laterally.

5, when the first door part 200 or the second door part 300 is pushed to the side, while the other end of the pivot arm 460 moves to the end along the protruding section 452 As shown in FIG. 6, while the other end of the pivot arm 460 moves along the movement section 451, the door section is not protruded but moved only laterally .

4, the first door portion 200 or the second door portion 300 is prevented from being opened freely without external force on the end side surface of the first rail portion 440, A locking protrusion 441 to which one end of the pivot arm 460 is attached may be formed. The locking protrusion 441 is provided to completely seal the storage compartment 110 by the first door 200 or the second door 300. The locking protrusion 441 may be formed in a manner such that when the door is closed, The locking protrusion 441 can elastically restrain one end of the pivot arm 460.

4 to 6, the door moving means 400 may be configured such that the first door portion 200 or the second door portion 300 is freely opened without any external force in addition to the locking protrusion portion 441 And may include door locking means 470 to prevent the double locking.

The door locking means 470 includes a locking portion 471 protruding from one end of the bracket 420 and a locking portion 471 provided to face the locking portion 471 and contacting the locking portion 471 A hinge part 472 for locking or unlocking the bracket 420 while being rotated through the hinge part 472 and an elastic member 473 elastically installed on the hinge part 472 to provide a restraining force to the bracket 420. [ have.

Therefore, as shown in FIG. 4, the hinge portion 472 restricts the latching portion 471 so as to seal the storage chamber 110 while the door is closed, and to prevent the door from being opened freely without external force. Is provided by the elastic member 473. The elastic member 473 may be a torsion spring that provides an elastic force in a direction in which the door is closed, and may be installed on a rotary shaft of the hinge portion 472.

4, when the user opens the door, the bracket 420 is moved to the left in the drawing, as shown in FIG. 5, so that the engaging portion 471 overcomes the restraining force of the elastic member 473, And can be moved in the opening direction of the door portion while forcing the hinge portion 472 to rotate.

6, when the engaging portion 471 passes the hinge portion 472, the hinge portion 472 can be rotated to the original position by the restoring force of the elastic member 473. In this state, The hinge portion 472 is rotated in the clockwise direction by the inclined surfaces formed respectively in the locking portion 471 and the hinge portion 472 so that the locking portion 471 is locked by the inclined surfaces formed in the locking portion 471 and the hinge portion 472, It is possible to prevent the additional opening from occurring freely.

5, when the first door part 200 or the second door part 300 is slid sideways, the first door part 200 and the second door part 300 may be slid smoothly and smoothly, The tapered portion t may be formed on the inner side of each of the boundary portions of the two door portions 300 so as to extend to the outside of the door portion. The tapered portion t smoothly slides and moves sideways without being caught by the main body 100 when the corresponding door portion begins to slide at the initial opening.

5 and 6, at least any one of the main body 100 and the first and second door portions facing the main body 100 is provided with a hermetic seal of the storage chamber 110 So that the cool air is prevented from leaking to the outside of the main body 100.

The sealing means s may be installed only in the main body 100 facing the first and second door portions 200 and 300 as illustrated in FIGS. 5 and 6. Alternatively, the first and second door portions 200 and 300 Or may be installed in both the main body 100 and the first and second door units 200 and 300.

A gasket or a rubber magnet for hermetic sealing may be used for the sealing means s. The rubber magnet may absorb not only hermetic but also impact generated when the door is closed, So that the door can not be freely opened by gravity.

3, the storage compartment 110 may include a short-term storage unit 111, a second storage unit 110, a second storage unit 110, a second storage unit 110, A medium-term storage unit 112, and a long-term storage unit 113 may be sequentially formed.

For example, the short-term storage unit 111 is a storage area for storing food having the shortest storage period, and is a region that is opened when the first door unit 200 or the second door unit 300 is opened for the first time .

Therefore, the food stored in the short-term storage unit 111 can be taken out by opening the door part completely without opening the door part by storing the foodstuff having a short storage period or frequently used in real life in the short-term storage unit 111, Since the foodstuff stored in the medium-term storage unit 112 or the long-term storage unit 113 is not exposed to the outside, the outflow of cold air can be reduced, and the foodstuff can be stored for a relatively long time, thereby reducing the power consumption of the refrigerator.

3, the boundary portion A-A 'between the short-term storage portion 111 and the middle-stage storage portion 112, the intermediate storage portion 112 and the boundary portion A- At each of the points corresponding to the boundary portion B-B 'of the long-term storage portion 113, a latching jaw 442 may be formed to notify the user of the position of the storage portion through the sense of latching of the moving door portion.

The pawl arm 460 moves along the first rail 440 to the stopping jaw 442. The pawl arm 460 moves along the first rail 440 to the stopping jaw 442, 442 to provide the user with a sense of latching through the door portion.

The user can sense the area of the short-term storage unit 111, the medium-term storage unit 112, and the long-term storage unit 113 more reliably by sensing the sense of latching by the latching jaws 442.

7, at least one of the first door portion 200 'and the second door portion 300' is attached to the refrigerator 10 'according to another embodiment of the present invention. A window portion w of a viewable material can be provided so that the inside of the window portion w can be seen.

The window part (w) can be made of a transparent or semitransparent synthetic resin or tempered glass and can see the inside of the refrigerator (10 ') so that the position of the food can be checked in advance before the food is taken out from the refrigerator The cold outflow time can be shortened.

Meanwhile, another embodiment of the present invention can provide a method for opening and closing a refrigerator having a sliding door.

Although the method of opening and closing the refrigerator according to the present embodiment is not largely different from that described above, main contents will be described step by step.

The protruding section 452 and the moving section 451 are connected to each other so that the protruding section 452 of the second rail 450 having an L- And a step of closing the storage compartment 110 of the refrigerator with the door unit 300 located at one side thereof.

Also, as one side of the door part slides toward the moving section 451 along the protruding section 452, the door starts to open the storage room 110 while protruding toward the front of the refrigerator.

When one side of the door part starting to open the storage compartment 110 is folded into the movement section 451 in the protrusion section 452, the door section is slid along the movement section 451 without further protrusion, The door protruding forwardly of the refrigerator overlaps with the other door portion to fully open the storage compartment 110.

While the present invention has been described in connection with what is presently considered to be preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is to be understood that the invention is not limited thereto.

10, 10 ': Refrigerator
100: main body 110: storage room
111: Short-term storage unit 112: Medium-
113: long-term storage unit 200, 200 ': first door unit
300, 300 ': second door part 400: door moving means
410: main rail 420: bracket
421: guide groove 430: connecting portion
440: first rail part 450: second rail part
451: a moving section 452: a protruding section
460: pivot arm t: tapered portion
s: Sealing means w: Window portion

Claims

A body having at least one storage chamber;
A first door portion and a second door portion that are slidably installed in front of the main body and open and close the storage chamber, respectively; And
And door moving means for causing the first door portion or the second door portion to slide toward each other,
Wherein the door moving means comprises:
A main rail portion disposed along the sliding direction of the first door portion or the second door portion;
A bracket that is moved along the main rail portion and has a guide groove formed in the same direction as the protruding direction of the first door portion or the second door portion;
A connecting part positioned between the first door part or the second door part and the bracket and moving the first door part or the second door part forward;
A first rail disposed parallel to the main rail;
A second rail having a movement section arranged in parallel to the first rail section and a projection section arranged in an intersecting direction with the movement section; And
And a sliding door hinged to the connecting part and having a first end moving along the first rail and the other end being fitted to the second rail and moving along the protruding section and the moving section.

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The method according to claim 1,
Wherein a sliding protrusion is formed on an end side surface of the first rail to prevent the first door or the second door from being opened freely without external force, the locking protrusion being engaged with one end of the pivot arm.

The method of claim 3,
Wherein the door moving means includes door locking means for preventing the first door portion or the second door portion from being opened freely without any external force,
Wherein the door lock-
An engaging portion formed at one end of the bracket;
A hinge unit provided on the main body so as to face the latching unit and locking or unlocking the bracket while being rotated through contact with the latching unit; And
And an elastic member elastically installed on the hinge portion to provide a restraining force to the bracket.

The method according to claim 1,
And a tapered portion having a structure extending outwardly so that each door smoothly slides is formed on the inner side of each of the boundary portions of the first door portion and the second door portion.

The method according to claim 1,
And a sealing means for maintaining the airtightness of the storage compartment is provided at least at one of the main body and the inner side of the first and second door portions facing the main body.

The method according to claim 6,
Wherein the sealing means is a gasket or a rubber magnet.

The method according to claim 1,
Wherein the storage room comprises a short-term storage unit, a middle-term storage unit, and a long-term storage unit sequentially formed in the order of opening first along the direction in which the first door unit and the second door unit are opened.

9. The method of claim 8,
And a storage unit for storing the position of each of the storage units at a boundary between the short-term storage unit and the medium-term storage unit and at respective points corresponding to the boundary between the medium-term storage unit and the long-term storage unit in the first rail, A refrigerator having a sliding door formed with a catching jaw.

The method according to claim 1,
Wherein at least one of the first door portion and the second door portion is provided with a window portion of a material that can be seen through the inside of the body.

A body including two or more storage rooms arranged side by side in a single direction and having a plurality of divided food storage spaces;
A first door portion that slides in one direction along the body to selectively open and close any one of the storage compartments;
A second door part that slides in the first direction along the body to selectively open and close another one of the storage rooms;
And door moving means for moving one of the first door portion and the second door portion to the other of the first door portion and the second door portion,
Wherein the door moving means comprises:
A first rail extending in one direction;
A second rail disposed in front of the first rail; And
And a pivot arm connected to the first door portion and the second door portion and having one side moved along the first rail portion and the other side moved along the second rail portion,
The second rail portion
A moving section extending in one direction; And
And a protruding section extending in a direction crossing the one direction.

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12. The method of claim 11,
Wherein the first door portion or the second door portion is rotatably connected to the pivot arm.

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