Adjustable support arm for video monitor

Abstract

An extension arm has an inner end mounted to a base plate for rotation about a first vertical axis, and an outer end supporting a head assembly. The head assembly has a lower disc fixed to the arm and an upper disc mounted to the lower disc for rotation about a second vertical axis. A first clevis is secured to the upper disc, and includes a first clevis pin passing through the lower end of a connection arm about a first horizontal axis. Adjustable locking means are provided in the first clevis pin, to interlock the first clevis with the connection arm in a selected rotational position about the first horizontal axis. The upper end of the connection arm is secured to a second clevis with a second clevis pin about a second horizontal axis. The second clevis is mounted to a monitor plate which supports the video monitor.

1 . An adjustable support arm for a video monitor, comprising:
 a. a base plate;   b. an extension arm having an inner end and an outer end, said inner end being mounted to said base plate for rotation about a first vertical axis;   c. a head assembly having a lower disc fixed to said outer end of said extension arm and an upper disc mounted to said lower disc for rotation about a second vertical axis;   d. a first clevis secured to said upper disc, said first clevis including a first clevis pin;   e. a connection arm having a lower end and an upper end, said first clevis pin passing through a bore in said lower end about a first horizontal axis.   f. adjustable locking means in the first clevis pin, to interlock the first clevis with the connection arm in a selected rotational position about said first horizontal axis;   g. a video monitor plate; and,   h. a second clevis secured to said video mounting plate, said second clevis including a second clevis pin passing through said upper end of said connection arm about a second horizontal axis.   
     
     
         2 . An apparatus as in  claim 1  including a keyboard plate, said keyboard plate being pivotally attached to an underside of said lower disc about a third horizontal axis. 
     
     
         3 . An apparatus as in  claim 1  in which said first clevis includes a first side plate and a second side plate and in which said adjustable locking means comprises splines on one end of said first clevis pin, and a spline receiver in said second side plate. 
     
     
         4 . An apparatus as in  claim 3  in which a clevis pin tube is provided in said bore of said lower end of said connection arm, said clevis pin tube including tube key to engage a connection arm keyway. 
     
     
         5 . An apparatus as in  claim 4  in which said first clevis pin slidably translates within said clevis pin tube, and in which said first clevis pin includes a pin key to engage a second side plate keyway. 
     
     
         6 . An apparatus as in  claim 5  further including resilient bias means to urge said splines of said first clevis pin into engagement with said spline receiver. 
     
     
         7 . An apparatus as in  claim 6  in which said resilient bias means comprises a spring in coaxial relation with said first clevis pin. 
     
     
         8 . An apparatus as in  claim 1  in which said video monitor plate is planar and includes means for direct attachment to a flat screen video monitor. 
     
     
         9 . An apparatus as in  claim 8  in which a loudspeaker is attached to an upper end of said video monitor plate. 
     
     
         10 . An adjustable support arm for a video monitor, comprising:
 a. a base plate;   b. an extension arm having an inner end and an outer end, said inner end being mounted to said base plate for rotation about a first vertical axis;   c. a head assembly having a lower disc fixed to said outer end of said extension arm and an upper disc mounted to said lower disc for rotation about a second vertical axis;   d. a connection arm having a lower end and an upper end;   e. first means for rotatably attaching said lower end of said connection arm to said upper disc about a first horizontal axis, and for selectively locking said connection arm in a selected rotational position;   f. a video monitor plate; and,   g. second means for rotatably attaching said upper end of said connection arm to said video monitor plate about a second horizontal axis.   
     
     
         11 . An apparatus as in  claim 10  in which said base plate is mounted to an arm of a chair. 
     
     
         12 . An apparatus as in  claim 10  including a keyboard plate, said keyboard plate being pivotally attached to an underside of said lower disc. 
     
     
         13 . An apparatus as in  claim 10  in which said first means for rotatably attaching said lower end of said connection arm to said upper disc comprises a first clevis and a first clevis pin. 
     
     
         14 . An apparatus as in  claim 13  in which said means for selectively locking said connection arm in a selected rotational position comprises splines on one end of said first clevis pin, and a spline receiver in a side plate of said first clevis. 
     
     
         15 . An apparatus as in  claim 14  further including resilient bias means to urge said splines of said first clevis pin into engagement with said spline receiver. 
     
     
         16 . An apparatus as in  claim 10  in which said video monitor plate is planar and includes means for direct attachment to a flat screen video monitor. 
     
     
         17 . An apparatus as in  claim 10  in which said second means for rotatably attaching said upper end of said connection arm to said video monitor plate comprises a second clevis and a second clevis pin. 
     
     
         18 . An adjustable support arm for a video monitor, comprising:
 a. a base plate;   b. an extension arm having an inner end and an outer end, said inner end being mounted to said base plate for rotation about a first vertical axis;   c. a head assembly having a lower disc fixed to said outer end of said extension arm and an upper disc mounted to said lower disc for rotation about a second vertical axis;   d. a first clevis secured to said upper disc, said first clevis including a first clevis pin;   e. a connection arm having a lower end and an upper end, said first clevis pin passing through said lower end about a first horizontal axis.   f. adjustable locking means in the first clevis pin, to interlock the first clevis with the connection arm in a selected rotational position about said first horizontal axis;   g. a video monitor plate; and,   h. a flange on said upper end of said connection arm for attachment to said video monitor plate.   
     
     
         19 . An apparatus as in  claim 18  in which said video monitor plate includes an upper planar surface for the support of a CRT video monitor. 
     
     
         20 . An apparatus as in  claim 19  including a keyboard plate, said keyboard plate being pivotally attached to an underside of said lower disc.