be adjusted if desired so that the operating faces of all of the stop screws 50 will engage the inboard face of the track 13 the lever handle 44 is then swung inboard causing pivotal movement of the cleat member 40 and the locking bar 46 until the cleat face 41 firmly engages the outboard face of the track 13 and the pivot pin 45 moves through the dead center position of the pins 42 and 45 until the lever handle 44 is in its innermost position as disclosed in fig2 in this operative clamping or locking position of the lever handle 44 in fig2 the pivot pin 45 is moved on the opposite side of its dead center position from its unclamping position disclosed in fig6 to securely clamp and lock the cleat face 41 against the outboard surface of the track 13 the clamp device 30 will then remain in its clamped operative position until the lever handle 44 is positively swung outboard to its inoperative position when it is desired to release or remove or transfer the clamp device 30 to another position the abutment screw 48 may be threadedly projected or retracted relative to the cavity 35 in order to vary the position of the locking bar 46 and thereby the cleat member 40 through the interconnection of the handle member 44 to change the degree of pressure exerted by the cleat face 41 upon the track 13 or to accommodate slightly varying widths or thicknesses of the track 13 once the cleat member 40 is clamped in locking operative position against the track 13 it cannot.