Hydraulic Jacks And Rams

The hydraulic jack with a base plate on which are attached a pump cylinder, a jack cylinder, and a reservoir concentrically surrounding the jack cylinder, the reservoir being connected to the pump cylinder by means of a first passage, passing through the base plate, and a first nonreturn valve which enables hydraulic medium to flow from the reservoir on pumping, the pump cylinder being connected to the jack cylinder by means of a second passage, passing through the base plate, and a second nonreturn valve which enables hydraulic medium to flow from the pump cylinder on pumping.

Hydraulic jack is provided with a base plate on which are attached a pump cylinder, a jack cylinder, and a reservoir concentrically surrounding the jack cylinder, the reservoir being connected to the pump cylinder by means of a first passage, passing through the base plate, and a first nonreturn valve which enables hydraulic medium to flow from the reservoir on pumping, the pump cylinder being connected to the jack cylinder by means of a second passage, passing through the base plate, and a second nonreturn valve which enables hydraulic medium to flow from the pump cylinder on pumping, and the jack cylinder being connected to the reservoir by means of a relief passage and a blocking member including an adjustable bolt, wherein the adjustable bolt is guided in a blocking bore situated in the base plate, which bore has a section formed as blocking seat and which bore, on one side of this seat, has a section which is connected by means of a first communicating bore to the reservoir and on the other side of this seat, has a section which is connected by means of a second communicating bore to the jack cylinder.

The main objective is to provide an improved hydraulic jack who has a quick release handle mounted beside the handle, so that the user is able to release the pressure built up in the hydraulic cylinder. Another objective of the hydraulic rams is to provide a hydraulic jack which is able to move to any desired direction as required. A hydraulic ram can be single or multi staged. A multi-stage hydraulic ram is provided with telescopic ram tubes which are terminated by end assemblies which provide a working surface for hydraulic fluid under pressure and a sliding bearing on a next adjacent ram tube. Each of the end assemblies is so mounted on its associated tube and so dimensioned that removal of it from the tube and the ram in an axial direction can be carried out without obstruction from the end assembly of the next adjacent ram of smaller diameter. The hydraulic rams relates to hydraulic rams and particularly to multi-stage hydraulic rams comprising a plurality of telescopic ram tubes extendible by a hydraulic fluid under pressure. In a multi-stage hydraulic ram hitherto proposed the ends of the ram tubes are provided with end assemblies which embrace the ends of the tubes.