Ordnance – Pneumatic
Patent
1994-09-12
1996-07-09
Johnson, Stephen M.
Ordnance
Pneumatic
F41A 104
Patent
active
055334342
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a system for supplying a device with a volume of hydraulic fluid whose predetermined value varies according to operating conditions. The system includes a hydraulic jack comprising a piston and a cylinder that, together with the piston, define a variable-volume chamber connected to the device. The system also includes structure for supplying the chamber with pressurized fluid, structure for controlling the travel of the piston that may include introducing pressurized fluid into the cylinder on the side opposite the chamber, and structure for damping the movement of the piston at the end of its travel.
In general, in a supply system of the aforesaid type, the damping structure, for example, be of the hydraulic compression effect type or the servo type.
For damping by the hydraulic compression effect, the end of the jack cylinder may have a cavity designed to receive a projection of a corresponding shape provided on the piston. The jack, equipped with such damping structure, is designed for specific operating conditions. In other words, the jack is chosen as a function of the feed conditions necessary to the operation of the device. If these conditions are changed, particularly the speed of the piston at the end of its travel, the jack must be replaced by a jack whose characteristics are matched to the new conditions, which may entail assembly/disassembly operations that are often lengthy and tedious.
Servo damping by controlling the flowrate of the fluid supplied to the jack requires an apparatus comprising particular pressure and position sensors that deliver signals that are subsequently processed by a computer to regulate the fluid flowrate as the piston moves. Such apparatus is complex, expensive, and difficult to develop.
SUMMARY OF THE INVENTION
An object of the invention is to design a supply system of the aforesaid type wherein the piston end-of-travel damping structure is designed to take into account operating conditions that can be modified, which modifications do not entail replacement of the jack and/or the damping structure, the latter being designed for variable speeds attained by the piston at the end of its travel.
In order to achieve this and other objects, the invention in one aspect proposes a supply system of the type that includes a piston having a variable speed at the end of its travel, the speed being determined by the initial axial length of the chamber of a jack. The piston end-of-travel damping means includes a rod mounted on a cylinder end that projects inside the chamber and a cavity of a corresponding shape and size formed on the piston that is designed to receive the piston end-of-travel rod to brake and damp the movement of the piston by a hydraulic compression effect. Means are also provided to regulate the length of the rod projecting into the chamber as a function of the speed attained by the piston at the end of travel.
According to another aspect of the invention, the jack cylinder end in the direction in which the piston moves is axially movable to adjust the initial volume of the chamber, and the means regulating the length of the rod of the damping means projecting inside the chamber also adjusts the position of the end of the cylinder.
According to another aspect of the invention, the aforesaid adjusting means simultaneously ensures movement of the rod of the damping means and the cylinder end so that the rod of the damping means projects inside the chamber over a length that increases with a decrease in volume of the chamber.
According to yet another aspect of the invention, there is provided a hydraulic fluid system comprising a hydraulic jack comprised of piston and a cylinder that together define a variable volume chamber, a fluid supply connectable with the chamber for supplying the chamber with pressurized fluid so as to control the movement of the piston, and a damper assembly, coupled to said piston, for damping movement of the piston at the end of its travel, wherein the speed of the piston at
REFERENCES:
patent: 4050349 (1977-09-01), Graham
patent: 4281582 (1981-08-01), Jaqua
patent: 4523508 (1985-06-01), Mayer et al.
patent: 4745841 (1988-05-01), Magoon et al.
patent: 5381722 (1995-01-01), Begneu
Giat Industries
Johnson Stephen M.
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