Kevin Hansen

US Patent:

D639011, May 31, 2011

Filed:

Jul 19, 2010

Appl. No.:

29/366082

Inventors:

Ted E. Ahrenholtz - Minnetonka MN, US
Justin P. Boortz - Waconia MN, US
Kevin J. Hansen - Eden Prairie MN, US

International Classification:

1205

US Classification:

D34 31, D34 35

US Patent:

D653834, Feb 7, 2012

Filed:

Apr 20, 2011

Appl. No.:

29/390158

Inventors:

Ted E. Ahrenholtz - Minnetonka MN, US
Kevin J. Hansen - Eden Prairie MN, US

Assignee:

Bluerock Technologies, Inc. - Minneapolis MN

International Classification:

1205

US Classification:

D34 31

US Patent:

20120091411, Apr 19, 2012

Filed:

Sep 28, 2011

Appl. No.:

13/247401

Inventors:

Kevin J. Hansen - Eden Prairie MN, US
Ted E. Ahrenholtz - Minnetonka MN, US
Justin Paul Boortz - Waconia MN, US

Assignee:

BLUEROCK TECHNOLOGIES, INC. - Minneapolis MN

International Classification:

B66F 3/25

US Classification:

254 93 R

Abstract:

A self-retracting hydraulic jack assembly is provided which includes a leg retraction compression spring carried by the piston rod assembly encased within the hydraulic extension cylinder of the jack. The hydraulic jack has first and second telescoping tubular leg members that are extensible relative to one another in response to the introduction of hydraulic fluid through the piston rod assembly and into the extension cylinder of the jack assembly. A third freely adjustable drop-leg telescopes into the other legs of the jack assembly through a cam actuated pull-pin casting mounted thereto.