High-pressure hydraulic gun

Claim 1

A high-pressure hydraulic gun for injecting flowable sealant or the like comprising a barrel having walls that form an interior cylindrical bore closed at opposite ends, a piston assembly sealed with and slidable within the bore, the piston assembly dividing the barrel bore into a hydraulic fluid pressure chamber and a material receiving chamber, a hydraulic pump assembly including a pump piston housing having an internal cylinder, a piston within the pump cylinder, a manually operable handle pivotal on the housing, means connecting the handle to the piston whereby pivotal movement of the handle causes reciprocation of the piston, a reservoir for hydraulic fluid formed by a hollow elongated chamber having one end rigidly directly attached to the pump housing, the ends of the pump assembly being formed respectively by the pump housing and an end of the reservoir opposite said one end, the piston being adapted to receive hydraulic fluid from the reservoir and pump it out of the housing through an associated port, a port on a wall of the cylinder communicating with the hydraulic fluid chamber, means connecting the pump port to the hydraulic fluid chamber port whereby fluid pumped by said pump piston is conducted into said hydraulic fluid chamber, means mounting said pump assembly alongside said barrel, said mounting means including elements adjacent each end of the pump assembly extending between and rigidly joining the pump assembly to the barrel, said elongated reservoir extending alongside a substantial portion of the length of said barrel, the mounting means avoiding excessive stress on the pump housing and the pump port connecting means by transferring at least a portion of any forces tending to displace the pump assembly relative to the barrel directly to the barrel at a location adjacent the opposite end of the reservoir, said gun including supporting surface means adapted to support said gun on a surface parallel to said barrel, said supporting surface means including elements defining a flat plane, said elements being disposed at locations spaced axially along the barrel a distance substantially at least as great as the length of said reservoir, said flat plane defined by said elements of said supporting surface means being on a side of said barrel opposite said pump assembly whereby pumping forces on said handle towards said barrel are adapted to be transferred by said elements to a floor surface or the like in a stable manner.