oriented structural element commonly formed of metal tubing of approximately three quarter inch external diameter this is especially true of modern hospital beds and gurneys which have tubular side rails at or about the level of the patient support surface and of most wheelchairs that have lateral rails at approximately arm support level and horizontal tubular elements in handlebar structure extending thereabove these tubular elements may vary in size but seldom are less than five eighths inch nor greater than one and one quarter inches in diameter and our apparatus will accommodate all tube sizes in this range by reason of the adjustable nature of its support connecting structures to install our connector the horizontal element 38 and vertical element 39 are manually moved into closely spaced adjacency as shown in fig1 of the drawings the movable elements of i v support fastening arms 12 are loosened sufficiently by adjustment of knob 25 sufficiently that vertical element 39 may be positioned between 34 v 34 shaped jaw elements 22 when so positioned the height of the connector is adjusted on the vertical element 39 so that the arm bracket 11 may contact the adjacent horizontal element 38 and the adjustment knob 25 is then tightened to positionally maintain the connector on the vertical element 39 at this position at this point patient support fastening arm 11 will be maintained by its bias in a horizontal position perpendicular to the axis of vertical support element 39 as shown in fig2 of the drawings to.