Hydraulic self-adaptive adjusting foot

Abstract

The invention discloses a hydraulic self-adaptive adjusting foot wherein an upper cover is arranged at the upper end of the bottom shell, a piston body arranged in the bottom shell and a piston ring seal arranged between outer circumferential face of piston body and inner wall of bottom shell; a return spring is arranged between bottom of the piston body and the bottom shell while the bottom end of the support post penetrates into the bottom shell from the center hole of the upper cover in a sealing mode. A groove is provided in the center of bottom surface of the flange at bottom end of said support post and a steel ball return spring is set in said groove; in the middle of bottom surface of piston body is provided with spring groove in which sets the top end of return spring; at the axis of spring groove sets the hydraulic oil passage between top end of which and bottom end of steel ball return spring arranges the steel ball. The invention has following merits: the hydraulic oil flows and migrates in upper and lower piston chambers via hydraulic oil passage controlled by steel ball joint work of which and return spring enables supporting objects reach stable state and bottom foot's height be automatically adjusted; the appearance of invention is simple and compact, suitable for repeating adjustments.

1 . A hydraulic self-adaptive adjusting foot comprises a bottom shell, an upper cover, a support post, a return spring, a piston body and a piston ring seal wherein the upper cover is arranged at the upper end of the bottom shell with openings, the piston body arranged in the bottom shell and a piston ring seal arranged between outer circumferential face of piston body and inner wall of bottom shell; a return spring is arranged between bottom of the piston body and the bottom shell while the bottom end of the support post penetrates slidably into the bottom shell from the center hole of the upper cover in a sealing mode; the invention is characterized in that a flange is arranged at the bottom of said support post and in the center of bottom surface of said flange is provided with a groove in which a steel ball return spring is provided; in the middle of bottom surface of piston body is provided with spring groove in which sets the top end of return spring; at the axis of spring groove sets the through hole as hydraulic oil passage between top end of which and bottom end of steel ball return spring arranges the steel ball. 
     
     
         2 . The hydraulic self-adaptive adjusting foot according to  claim 1  wherein an upper flange for mounting the bottom end of the return spring is arranged at the center of the bottom surface inside said bottom shell. 
     
     
         3 . The hydraulic self-adaptive adjusting foot according to  claim 1  wherein said upper cover is connected with the upper end of the bottom shell through threads. 
     
     
         4 . The hydraulic self-adaptive adjusting foot according to  claim 1  wherein the steel ball return spring is a tower-shaped spring whose diameter of the small-diameter end is slightly shorter than that of said steel ball and abuts against the steel ball. 
     
     
         5 . The hydraulic self-adaptive adjusting foot according to  claim 1  wherein a chamfer matched with the spherical surface of the steel ball is arranged at the top end of the hydraulic oil passage. 
     
     
         6 . The hydraulic self-adaptive adjusting foot according to  claim 1  wherein between said support post  2  and the center hole of the upper cover  4  arranges seal sleeve of upper cover  3 ; at the inner circumferential surface of said seal sleeve of upper cover  3  is provided with at least one annular groove in which the sealing ring of support post is arranged.