around an angle iron when wing nut actuated bolt 76 is retracted without any difficulty as seen in fig4 and 5 base 71 cooperates with tube assembly 60 which includes cylinder 61 for receiving a corresponding post 55 or 56 bracket 62 is rigidly attached to cylinder 61 in the preferred embodiment bracket 62 includes bolt 63 rigidly attached to said bracket 62 and a corresponding nut 64 and washer 65 bracket 62 and bolt 63 cooperate with base 71 through hole 67 such that they are releasably and pivotally connected cylinder 61 further includes pull out spring pin 66 which serves as means to releasably engage with and secure post 55 or 56 thus vertical tube cylinders 55 and 56 can be raised or lowered tube assembly 60 is a common mechanical device used with bedside rails in use universal bedside rail clamp 70 can easily and quickly be installed on mattress frame 32 without the use of tools when the wing nut actuated bolt 76 is sufficiently loosened the position where needed here at rail 33 is located as shown in fig4 and 5 universal bedside rail clamp 70 is inserted from above mattress frame 32 at an angle such that the end 79 of hook like member 73 passes horizontal end 40 clamp 70 easily slides onto mattress frame 32 until vertical flange 75 passes vertex 44 and acute angle 74 is flush with horizontal end.