An adjustable bladder assembly for use with a closed hydraulic power system is provided. The bladder assembly includes a rigid body and a bladder cover slidably engaged therein. The bladder cover divides an interior area of the bladder assembly into first and second portions. The first portion of the bladder assembly is configured to be in fluid communication with a fluid reservoir of the hydraulic power system, with internal pressure of the hydraulic power system acting on an inner surface of the bladder cover, thereby biasing the bladder assembly towards an inflated configuration. The second portion of the bladder assembly is open to the environment such that ambient air pressure acting on an outer surface of the bladder cover biases the bladder assembly towards a deflated configuration.

A hydraulic jack capable of quickly lifting a load includes a frame (1) mounted with a lifting arm (2), a long connecting rod, a tray (4), a bracket and a hydraulic oil pump (3) for driving the lifting arm (2), and further includes a large pump (11) and a small pump (12) for supplying high pressure oil to the hydraulic oil pump (3). An inner cavity of the large pump (1) and a small pump core are axially connected to a hand press (8) respectively. The inner cavity of the large pump (11) is in communication with a first pressure regulation mechanism (9), and the inner cavity of the small pump (12) is in communication with a second pressure regulation mechanism (10). The first pressure regulation mechanism (9) comprise a first upper valve body (90) mounted on a lower valve body (33), a first oil outlet (91) of a communicating oil compartment (32) provided on a side wall thereof, and a first oil inlet (92) provided at a bottom thereof, the first oil inlet (92) being in communication with the inner cavity of the large of the large pump (11). A central hole of the first upper valve body (90) is sequentially provided from bottom to top with a first lower steel ball (93) capable of blocking the first oil inlet (92), a first ball valve base (94), a first pressure spring (95), a first valve core (96) and a first valve rod (97), the first pressure spring (95) being disposed between the first ball valve base (94) and the first valve core (96). The second pressure regulation mechanism (10) and the first pressure regulation mechanism (9) have the same structure.

A hydraulic jack capable of quickly lifting a load includes a frame (1) mounted with a lifting arm (2), a long connecting rod, a tray (4), a bracket and a hydraulic oil pump (3) for driving the lifting arm (2), and further includes a large pump (11) and a small pump (12) for supplying high pressure oil to the hydraulic oil pump (3). An inner cavity of the large pump (1) and a small pump core are axially connected to a hand press (8) respectively. The inner cavity of the large pump (11) is in communication with a first pressure regulation mechanism (9), and the inner cavity of the small pump (12) is in communication with a second pressure regulation mechanism (10). The first pressure regulation mechanism (9) comprise a first upper valve body (90) mounted on a lower valve body (33), a first oil outlet (91) of a communicating oil compartment (32) provided on a side wall thereof, and a first oil inlet (92) provided at a bottom thereof, the first oil inlet (92) being in communication with the inner cavity of the large of the large pump (11). A central hole of the first upper valve body (90) is sequentially provided from bottom to top with a first lower steel ball (93) capable of blocking the first oil inlet (92), a first ball valve base (94), a first pressure spring (95), a first valve core (96) and a first valve rod (97), the first pressure spring (95) being disposed between the first ball valve base (94) and the first valve core (96). The second pressure regulation mechanism (10) and the first pressure regulation mechanism (9) have the same structure.

A transportable jack system includes a jack disposed on a base. The base includes a base plate with a plurality of wheel openings formed therein, and a biasing member disposed between a wheel and the base plate. The biasing member is configured from a single piece of material consisting of a top horizontal portion, a bottom horizontal portion, and an angled middle portion disposed between the top horizontal portion and the bottom horizontal portion. The biasing member biases the base away from a ground surface when a load applied to the jack is below a predetermined threshold and deforms when the load is above the predetermined threshold, wherein the deformation allows the base plate to contact the ground surface.

A power unit for a hydraulic floor jack is provided having a unitary forged steel manifold engaged with a ram assembly, the ram assembly and manifold being selected from materials and finishes that when interacting with a cylinder bearing, exhibits a longer performance life.

A power unit for a hydraulic floor jack is provided having a unitary forged steel manifold engaged with a ram assembly, the ram assembly and manifold being selected from materials and finishes that when interacting with a cylinder bearing, exhibits a longer performance life.

A transportable jack system includes a jack disposed on a base. The base includes a base plate with a plurality of wheel openings formed therein, and a biasing member disposed between a wheel and the base plate. The biasing member is configured from a single piece of material consisting of a top horizontal portion, a bottom horizontal portion, and an angled middle portion disposed between the top horizontal portion and the bottom horizontal portion. The biasing member biases the base away from a ground surface when a load applied to the jack is below a predetermined threshold and deforms when the load is above the predetermined threshold, wherein the deformation allows the base plate to contact the ground surface.

A hydraulic power unit for a floor jack that includes an internally-adjustable relief valve that is inaccessible to an operator without removing the power unit from the jack assembly and disassembling the power unit. By placing the relief valve inside of the hydraulic assembly, hidden from operators, the relief valve is less likely to be accidently adjusted when using or servicing the jack.

A hydraulic power unit for a floor jack that includes an internally-adjustable relief valve that is inaccessible to an operator without removing the power unit from the jack assembly and disassembling the power unit. By placing the relief valve inside of the hydraulic assembly, hidden from operators, the relief valve is less likely to be accidently adjusted when using or servicing the jack.

Method and apparatus for improved height adjustment of wall partitions. According to the present disclosure, an extendable Foot Controlled Elevator Device is placed beneath a wall partition. A user may then apply downward force on a Vertical Height Control to adjust the vertical position of the wall partition. In some embodiments, the Foot Controlled Elevator Device has a compressible base, allowing it to fit into tight areas (e.g., between toilets in a restroom under construction). In other embodiments, one or more Foot Controlled Elevator Devices may be linked, allowing for better control over the wall divider and simultaneous or distinct control of the respective Foot Controlled Elevator Devices.