The invention relates to a stand for a TV screen or a monitor, secured in a holder on a vertical rotary column, mounted in a base, fitted with a drive for forcing the pivoting movement of the column.

A solution, where a TV set holder gear provides a movement comprising at the same time a pivoting and linear movement is known from US 7 571883 B2. However, this solution is based upon a different functional basis, using a rocker suspension, which apparently can only be used if a TV set is secured to a vertical wall.

Also a solution of a stand for a TV screen, where the TV set holder drive provides at the same time a movement comprising a pivoting and horizontal rectilinear movement in a direction determined by the screen plane, is known from patent description US 7 699275 B2. This solution increases the potential angle of rotation of the screen by shifting the holder together with the TV set by a value proportional to the temporary distance of the TV set side to the axis of rotation. The effectiveness of this solution, in the form of a wide angle of rotation, is however restricted to the cases when it is used for narrow screens or when the nominal distance of the screen to the wall or potentially another obstacle is sufficiently big.

The restrictions of use of the described solutions presented above show the need for introducing a TV screen stand, where at an attempt to turn the screen in any direction the screen simultaneously goes away from the wall . Such a solution will allow the minimum distance from the TV screen to the wall to be significantly reduced when it is set up in parallel to the wall.

Thus the objective of the proposed solution is to introduce a stand for a screen that allows the pivoting movement of the carrying column to be controlled while its linear movement is enabled. Most of TV screens is set in such a way that their rear wall is located in direct vicinity of a wall or other equipment components. In a position like this the screen rotation is highly limited. This can be solved by the use of a stand with two movement functions: the pivoting function, for setting the angular position of the screen and the linear function, moving the screen away from the wall or another obstacle during the turn of the screen into one or the other direction from the nominal angular position.

A distinctive feature of the invention is a motion mechanism that enables a simultaneous shift of the rotary carrying column with the screen holder in a plane parallel to the base plane and its rotation. The motion mechanism has a kinematic chain changing the rotary movement of advantageously a driving motor unit to the linear movement of the carriage module relative to the stand base, which at the same time drives the pivoting movement of the carrying column with the screen holder, seated on the carriage module in the axis perpendicular to the stand base plane, forced by the movement of the carriage module against the base.

The driving unit, advantageously installed in the base body, has a combined pair of symmetrically arranged driving wheels, advantageously they are sprocket wheels, seated on a common shaft driven by a bi-directional rotational motor. If the speed of the applied motor is too high, a reduction gear should be used, advantageously a toothed gear. The turning toothed wheels cause a travel of the chains along with the clips, which are yoke connected to dogs. The dogs fixed to the carriage module shift it in guides, advantageously rectilinear guides, arranged symmetrically and stationary secured in the base body. The linear movement of the device is performed in the way described above.

To obtain a simultaneous swinging pivoting motion, the motion work is equipped with a pivot control unit and a cam control unit. Through the kinematic chain using the mentioned units, the linear motion of the carriage module forces a pivoting movement of the carrying column with the screen holder. The pivot control unit comprises advantageously two cam arms, secured freely pivoting on the carrying column, their rolls during the travel of the carriage module are guided in yoke guiding races formed symmetrically in the base at an angle to the carriage module travel direction. The travel of the carriage module while maintaining the cam arms in the guiding races forces their turn on the carrying column. The coupling gear using a travelling two-position switching member causes alternate engagement of the cam arms with the drive receipt ring seated stationary on the carrying column. Depending on which arm is engaged at the moment, during the carriage module travel towards ejection, the carrying column turns in one or the other direction.

The switching member is shifted by the cam control unit seated on the control cam shaft. The control cam shaft has two pins, which as a result of a change in the angular position of the control cam shaft cause a motion of the cam sleeve installed travelling on the control cam shaft between the pins. One guide mandrel of the cam sleeve travels in a longitudinal hole in the carriage module in parallel to the axis of the control cam shaft, whereas the other one through a slide sleeve shifts the switching member, engaging the left hand cam arm or right hand cam arm alternately into the driving kinematic chain.

The control cam shaft is set in angular motion by a lever, actuated by a clip travelling with a tension member. The control cam is put in motion only when the carriage module is fully retracted to its home position and the tension member clip on the drive wheel is in its bottom position. It is possible thanks to the yoke connection of the clip to the dog. The yoke function is performed by a longitudinal cut-out in the dog perpendicular to the base plane. During the ejecting motion of the carriage module from the home position through clips in their top position in the tension member, the carrying column turns only in one direction.

The home position of the carriage module in the stand is one of its two extreme positions, in which the screen is advantageously the nearest to the wall or another obstacle. At the same time in this position the horizontal edge of the screen installed on the column with the screen holder is perpendicular to the carriage module motion direction. Once the clip is in the bottom part of the tension member, the carrying column will turn in the opposite direction.

The proposed TV screen stand, thanks to its mechanical control and the use of one drive, guarantees a constant dependency of the angle of rotation of the carrying column on the value of its ejection on the carriage module, and consequently does not allow the suspended screen to be damaged. Thanks to the mechanical control the stand may be equipped with a one motion controller. In addition, the stand, due to its design enables the cables from the screen to be covered and guided through the stand, directly to a furniture chamber.

The solution according to the invention is presented in the embodiment shown in the drawings, where individual figures present:

Fig. 1 - the screen stand in an isometric projection,

Fig. 2 - the stand in a top view,

Fig. 3 - the stand in an isometric exploded view,

Fig. 4 - the stand base with the driving unit attached, in a perspective view, Fig. 5 - the separated carriage module, in a perspective view,

Fig. 6 - the components of the pivot control unit, in a perspective view,

Fig. 7 - the components of the cam control unit, in a perspective view,

A stand according to the invention consists of four distinguishable units: the base 1 , the carriage module 2, the driving unit 3, the pivot control unit 4 and the cam control unit 5.

An assembled screen stan, where the carriage module 2 is in its home position, is shown in an isometric projection in Fig. 1 .

The driving unit 3, advantageously installed in the base body 1 , has a combined pair of symmetrically arranged sprocket driving wheels 301 , seated on a common shaft 302 driven by a bi-directional rotary motor 303. The rotary motor 303 transfers the torque to the shaft 302 with a toothed reduction gear 304. The turning toothed wheels 301 cause a travel of chains 6 along with the clips 7, which are yoke connected to dogs 8. The dogs 8 stationary fixed to the carriage module 2 shift it in the rectilinear guides 101 , arranged symmetrically and stationary secured in the base 1 body.

Linear motion of the carriage module 2 forces the controlled motion of the pivot control unit 4, driving the carrying column 9 with the cam control unit 5. The pivot control unit consists of: left hand cam arm 401 , right hand cam arm 402, switching member 403, drive receipt ring 404 and guiding rolls 405, whereas the cam control unit 5 comprises: control cam shaft 501 , cam sleeve 502, two guide mandrels 503, two pins 504, slide sleeve 505 and lever 506.

The linear motion of the carriage module 2 forces the pivoting motion of the carrying column 9, on which a screen holder may be installed, through a kinematic chain using the pivot control unit 4 and the cam control unit 5.

The left hand cam arm 401 and the right hand cam arm 402 are rotationally installed on the carrying column 9. While travelling the carriage module 2, the guiding rolls 405 of both cam arms are guided in yoke guiding races 102 formed symmetrically in the base 1 , at an angle to the carriage module 2 motion direction. The shape and arrangement of the guiding races is shown in Fig. 2.

The travel of the carriage module 2 with simultaneous maintaining the both cam arms in the guiding races 102 forces their turn in opposite directions on the carrying column 9.

A coupling gear using a travelling two-position switching member 403 causes alternate engagement of the left hand cam arm 401 and the right hand cam arm 402 with the drive receipt ring 404 seated stationary on the carrying column 9. Depending on which cam arm is engaged at the moment, during the carriage module 2 travel towards ejection, the carrying column 9 turns in one or the other direction. The switching member 403 is shifted by the cam control unit 5 seated on the control cam shaft 501 . The control cam shaft 501 has two pins 504, which as a result of a change in the angular position of the control cam shaft cause a motion of the cam sleeve 502 installed travelling on the control cam shaft between the pins 504. One guide mandrel 503 of the cam sleeve 502 travels in a longitudinal hole 201 in the carriage module 2 in parallel to the axis of the control cam shaft 501 , whereas the other guide mandrel 503 through a slide sleeve 505 shifts the switching member 404, engaging with the drive kinematic chain alternately the left hand cam arm 401 or the right hand cam arm 402.

The control cam shaft 501 is set in angular motion by a stationary fixed lever 506, actuated by a clip 7 travelling along with the chain 6. The lever 506 is actuated only when the carriage module 2 is fully retracted to its home position and the clip 7 on the tension wheel 103 is in its bottom position. It is possible thanks to the yoke connection of the clip 7 to the dog 8. The yoke function is performed by a longitudinal cut-out 801 in the dog 8, rectangular to the base plane. During the ejecting motion of the carriage module 2 from its home position through clips 7 in their top position in the chain 6, the carrying column 9 turns only in one direction. The home position of the carriage module 2 in the stand is shown in Fig. 2. When during the chain 6 motion the clip 7 is in the lower part of the chain, the pivot direction of the carrying column 9 reverses. At the same time while the carrying column 9 pivot is reversing the carriage module 2 is in its home position.

In the base 1 also a wide longitudinal hole 104 is made to enable guiding the cables from the TV screen through the stand, directly to the furniture chamber.