Power plants – Pressure fluid source and motor – Ram driven by fluid pumped from reservoir
Reexamination Certificate
2001-11-05
2003-03-11
Look, Edward K. (Department: 3745)
Power plants
Pressure fluid source and motor
Ram driven by fluid pumped from reservoir
Reexamination Certificate
active
06530219
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a jack assembly, and more particularly to a jack assembly that may be lifted rapidly.
2. Description of the Related Art
A conventional jack in accordance with the prior art shown in
FIGS. 1-4
comprises a base
10
, a push seat
14
, and an outer cylinder
11
and an inner cylinder
12
mounted between the base
10
and the push seat
14
. An inner oil chamber is formed in the inner cylinder
12
, and an oil storage chamber “A” filled with hydraulic oil is formed between the outer cylinder
11
and the inner cylinder
12
. A lifting column
13
is mounted in the inner oil chamber of the inner cylinder
12
, and has a first end provided with a piston
131
, and a second end that may be protruded outward to perform a lifting action.
The base
10
is provided with a main oil path
102
, and has an end face provided with an oil suction hole
101
connected to the lower end of the main oil path
102
. An anti-reverse ball
31
is mounted in the lower end of the main oil path
102
to block the main oil path
102
, and is pushed by a post
32
. A main ball
33
is mounted in the mediate portion of the main oil path
102
, and is pushed by an adjusting screw
34
. An oil inlet hole
106
located above the main ball
33
is formed in the inner wall of the main oil path
102
, and is connected to the inner oil chamber as shown in FIG.
3
.
An oil hole
103
located above the anti-reverse ball
31
is formed in the inner wall of the main oil path
102
, and is connected to a return oil path
104
as shown in
FIG. 4. A
spring
42
is mounted in the return oil path
104
, and is pushed by a screw
41
. A pusher
43
is mounted on the lower end of the spring
42
, and has a distal end provided with a ball
44
which is placed in an oil hole that is connected to the oil hole
103
. The inner wall of the return oil path
104
is formed with a return oil hole
105
that is connected to the oil storage chamber “A”.
Thus, when the pump
2
mounted on the base
10
perform a suction action through the oil hole
103
, the hydraulic oil contained in the oil storage chamber “A” is sucked into the lower end of the main oil path
102
through the oil suction hole
101
, to push away the anti-reverse ball
31
, so that the hydraulic oil may be sucked into the oil hole
103
and the pump
2
. Then, when the pump
2
is pushed and compressed, the hydraulic oil may be pushed into the main oil path
102
without returning to the oil storage chamber “A” by stopping of the anti-reverse ball
31
. The hydraulic oil then pushes the main ball
33
upward, so that the hydraulic oil may flow through the oil inlet hole
106
into the inner chamber. The pump
2
may be operated continuously, so that the hydraulic oil may be pushed into the inner chamber successively, to force the lifting column
13
in the inner oil chamber of the inner cylinder
12
to move outward so as to perform a lifting action.
However, the amount of the hydraulic oil that is pushed into the inner chamber at each time is very small, and the inner chamber has a large cross-sectional area, so that the lifting velocity of the lifting column
13
is very slow, thereby consuming working time, and thereby causing inconvenience to the user.
SUMMARY OF THE INVENTION
The present invention has arisen to mitigate and/or obviate the disadvantage of the conventional jack.
The primary objective of the present invention is to provide a jack assembly that may be lifted rapidly. A lifting column is mounted in the inner cylinder. A secondary shaft formed with an oil hole is mounted in the lifting column, and has a distal end screwed into an axial hole in the base. The main oil path is provided with a lower ball, and an upper ball, the main oil path is formed with a first oil hole located above the lower ball and connected to the oil hole of the secondary shaft, and formed with a second oil hole located above the upper ball and connected to the inner oil chamber. The hydraulic oil pushes away the lower ball, so that the hydraulic oil may flow through the first oil hole into the oil hole of the secondary shaft, so that the lifting column that has not worked may be lifted rapidly. The lifting column works to increase the pressure of the hydraulic oil of the main oil path, so that the hydraulic oil flows through the second oil hole into the inner oil chamber of the inner cylinder, so that the lifting column may have a sufficient lifting force to lift an object.
In accordance with the present invention, there is provided a jack assembly that may be lifted rapidly, comprising: a base, a push seat, and an outer cylinder and an inner cylinder mounted between the base and the push seat, an inner oil chamber formed in the inner cylinder, an oil storage chamber formed between the outer cylinder and the inner cylinder, a lifting column mounted in the inner cylinder, and having a distal end provided with a piston, the base provided with a main oil path, and having an end face provided with an oil suction hole connected to the oil storage chamber and connected to a lower end of the main oil path, an anti-reverse ball mounted in the lower end of the main oil path to block the main oil path, and is pushed by a post, an oil hole located above the anti-reverse ball being formed in the inner wall of the main oil path, and connected to a return oil path; wherein:
a lower ball is mounted in a mediate portion of the main oil path, and is pushed by a first spring, an upper end of the first spring is provided with an upper ball, the upper ball is provided with a push post which is pushed by a second spring, an upper end of the second spring is pushed by an adjusting screw, the main oil path has an inner wall formed with a first oil hole that is located above the lower ball, the first oil hole is connected to an oil hole of a center of a secondary shaft that is mounted in the lifting column, the inner wall of the main oil path is formed with a second oil hole that is located above the upper ball, and is connected to the inner oil chamber; and wherein:
hydraulic oil in the oil storage chamber pushes away the lower ball, so that the hydraulic oil may flow through the first oil hole into the oil hole of the secondary shaft, the hydraulic oil may push the lifting column by means of a smaller cross-sectional area of an axial hole for receiving the secondary shaft, so that the lifting column that has not worked may be lifted rapidly, thereby shortening the working stroke, when lifting of the lifting column is stopped, the lifting column works and a pressure of the hydraulic oil of the main oil path is increased largely, whereby the upper ball is pushed away, so that the hydraulic oil flows through the second oil hole into the inner oil chamber of the inner cylinder, the inner oil chamber of the inner cylinder has a larger cross-sectional area, so that the lifting column may have a sufficient lifting force to lift an object.
The base has another end face provided with an anti-reverse valve, so that the hydraulic oil in the oil storage chamber may be introduced into the inner oil chamber of the inner cylinder, and hydraulic oil in the inner oil chamber of the inner cylinder cannot flow into the oil storage chamber.
The anti-reverse valve includes a screw seat, a ball, and a spring.
The anti-reverse valve has an oil hole formed in the end face of the base, the oil hole has a first end connected to a conducting pipe that is connected to the oil storage chamber, and a second end connected to the inner oil chamber of the inner cylinder.
Thus, during a non-work stroke of the lifting column, a suction action applied on the inner oil chamber of the inner cylinder forces hydraulic oil to flow through the conducting pipe, the anti-reverse valve and the oil hole to enter the inner oil chamber of the inner cylinder, so that the lifting column may be conveniently lifted rapidly.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with ap
Kamrath Alan
Lazo Thomas E.
Look Edward K.
Rider Bennett Egan & Arundel LLP
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