Implements or apparatus for applying pushing or pulling force – Fluid pressure – Vehicle attached
Reexamination Certificate
2003-08-22
2004-11-23
Wilson, Lee D. (Department: 3723)
Implements or apparatus for applying pushing or pulling force
Fluid pressure
Vehicle attached
C254S08900R
Reexamination Certificate
active
06820861
ABSTRACT:
FIELD OF THE INVENTION
Embodiments of the present invention generally relate to a bottle jack. More particularly, a quick lift bottle jack that can rise from a starting position to a load position in a short amount of time.
BACKGROUND OF THE INVENTION
Floor jacks are used to lift heavy objects or a load from one position to another position using hydraulic circuitry. Hydraulic fluid is moved from a fluid reservoir into an inner chamber of a cylinder rod that is connected with a load bearing surface. The load bearing surface is the surface that contacts the load to be lifted or moved by the floor jack. The hydraulic fluid is moved through various channels by the manual pumping of a pump by an operator. The fluid fills the cylinder rod and displaces it axially until the load is reached. Then the operator continues the pumping until the load is raised to the desired level. Once the desired load movement is completed, the hydraulic fluid is returned to the fluid reservoir through the channels for the next operation.
In conventional floor jacks the load bearing surface rises from a starting position at the same speed regardless of whether the jack has a load or not. The operator must wait until the load, such as a car, is lifted at the slow speed, to the desired height until he can work on it. The wait time and the pumping effort can waste time and be costly to small garage operators.
Therefore, there is a need for a floor jack that can reach the desired load quickly so as to decrease the wait time of the operator.
SUMMARY OF THE INVENTION
In one embodiment of the present invention, a hydraulic jack that can include an oil reservoir that stores a hydraulic fluid therein, an inner chamber axially disposed within the oil reservoir, a piston rod axially disposed within the inner chamber, a piston rod chamber is provided in the piston rod, a pump assembly having a pump piston that can reciprocate therein and a pumping chamber that can receive hydraulic fluid from the oil reservoir, wherein the pumping chamber's volume can be between about ⅕ to {fraction (1/7)} of the piston rod chamber's volume, and a sequence valve that can be press fitted into a hydraulic channel, may include a spherical ball having a hydraulic interacting surface and may regulate fluid flow from the pumping chamber to the inner chamber. The hydraulic fluid may be selected from oil, water, automatic transmission fluid, lubricants, other fluids and a combination thereof. The hydraulic jack can further include a scaling member that may be in sealing relationship between the piston rod and an inner chamber housing, wherein the fluid may act on a surface of the sealing member to move the piston rod axially. The pump piston may be moved reciprocally by a handle that can be attached thereto. The pumping chamber's volume may be ⅙ of the piston rod chamber's volume. The sequence valve may allow fluid to flow into the inner chamber when the piston rod meets a load. The piston rod may have a connector that can be coupled to a load bearing surface.
In another embodiment, a method of moving a load is provided and can include pumping a pump piston with a handle, drawing fluid from an oil reservoir to a pumping chamber by a vacuum created by the pumping, moving the fluid from the pumping chamber to a piston rod chamber by additional pumping of the pump piston, the pumping chamber's volume can be between about ⅕ to {fraction (1/7)} of the piston rod chamber's volume, extending a piston rod to contact a load with the fluid in the piston rod chamber, and extending the piston rod further to move the load by increasing the amount of fluid acting on the piston rod when needed by setting a sequence valve that may be pressed fitted and may have a spherical ball to open at a predetermined pressure so that fluid may be supplied to an inner chamber of the piston rod to move the piston rod. The fluid can be selected from a hydraulic fluid selected from oil, water, automatic transmission fluid, lubricants, other fluids and a combination thereof. Increasing the amount of fluid may occur when the piston rod reaches a load and requires additional fluid to move the load. The volume of the pumping chamber can be ⅙ the volume of the piston rod chamber. The increased amount of fluid can be acting on a sealing member that can be in sealing relationship between the piston rod and an inner chamber housing, wherein the fluid can act on a surface of the sealing member to move the piston rod axially.
In still another embodiment of the invention, a hydraulic bottle jack can include a means for storing a hydraulic fluid, a means for moving fluid into and out of a pumping chamber, a means for channeling fluid from the pumping chamber to a piston rod chamber, the pumping chamber's volume can be between about ⅕ to {fraction (1/7)} of a piston rod chamber, a means for lifting a load having the piston rod chamber therein, and a means for increasing fluid provides additional fluid to the means for lifting when the means for lifting requires additional fluid to move a load, wherein the means for increasing fluid can be pressed-fitted into the jack and has a spherical ball. The hydraulic bottle jack can further include a rocker means that can be coupled with the means for moving fluid, wherein the rocker having a handle can be used by an operator to move the means for moving fluid. The hydraulic fluid can be selected from oil, water, automatic transmission fluid, lubricants, other fluids and a combination thereof. The volume of pumping chamber can be ⅙ the volume of the piston rod chamber. The hydraulic bottle jack can further include a support means at one end so that the bottle jack may be placed in a position that allows the means for lifting to extend in an upwardly direction. The support means can include the means for channeling fluid. The means for lifting a load can be connected to a load bearing surface. The hydraulic bottle jack can further include a means for sealing positioned between the means for lifting and an inner chamber housing so that fluid can act on the means for sealing and move the means for lifting.
There has thus been outlined, rather broadly, the more important features of the invention in order that the detailed description thereof that follows may be better understood, and in order that the present contribution to the art may be better appreciated. There are, of course, additional features of the invention that will be described below and which will form the subject matter of the claims appended hereto.
In this respect, before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein, as well as the abstract, are for the purpose of description and should not be regarded as limiting.
As such, those skilled in the art will appreciate that the conception upon which this disclosure is based may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. It is important, therefore, that the claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention.
REFERENCES:
patent: 6450481 (2002-09-01), Oxtoby
patent: 6572080 (2003-06-01), Delikatzis
patent: 6585231 (2003-07-01), Fratoni, Jr.
patent: 6742767 (2004-06-01), Bruzek
Baker & Hostetler LLP
SPX Corporation
Wilson Lee D.
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