Spindle press

A spindle press comprising:

• an upright press support;
• a ram mounted on said support for vertical movement thereon;
• a spindle threadedly engaging said ram for displacing same on said support in one direction upon driven rotation of said spindle, said support being hollow and formed with a lubricant-containing internal compartment, said spindle extending into said compartment;
• and
• at least one return jack connecting said ram with said support for displacing said ram in the opposite direction in a return stroke, said ram having a lubricant passage through which lubricant is displaced into and out of said compartment by relative movement of said spindle and said ram, a throttle being connected with said passage for restricting flow therealong, said throttle being disposed on a lower portion of said ram and including a piston for blocking said passage upon said ram approaching a deadpoint position in a return stroke, whereby lubricant trapped between said spindle and said ram damps the termination of said return stroke, said passage being formed with a throttle cylinder receiving said piston and said piston being provided with a bypass passage, a lubricant bore communicating between said cylinder and said compartment and a further bore communicating between said cylinder and a reservoir for said lubricant, said piston being positioned to block at least one of said bores upon movement of said ram into a position close to said deadpoint position, said pistpn projecting upwardly from said portion of said ram toward a portion of said support, said portion of said support being provided with an adjustable abutment engaging said piston as said ram spproaches its deadpoint position.