Information
-
Patent Grant
-
6715320
-
Patent Number
6,715,320
-
Date Filed
Tuesday, December 5, 200023 years ago
-
Date Issued
Tuesday, April 6, 200420 years ago
-
Inventors
-
Original Assignees
-
Examiners
Agents
-
CPC
-
US Classifications
Field of Search
US
- 065 171
- 065 172
- 065 173
- 137 59616
- 137 884
- 137 271
- 137 2695
- 137 4545
-
International Classifications
-
Abstract
A fluid administration system for the operation of a cylinder and piston assembly for actuating mechanisms, mainly glassware forming and handling mechanisms, allowing rapid changing thereof, comprising: a passage network practiced at the cylinder cap, connected to the fluid admission and discharging passages of the centering ring, at the cylinder and at the support frame; and speed controlling valves, at the passage network of the cylinder cap, to control the velocity of discharging of fluid from the cylinder and piston assembly in its ascending and descending runs.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fluid administration system for the operation of cylinder and piston assemblies, and, more specifically, to a fluid administration system for the operation of cylinder and piston assemblies that allow a rapid changing of both the cylinder and piston assemblies and the actuating mechanisms that operated thereby, especially glassware forming and handling mechanisms on I.S. glassware forming machines.
2. Description of the Related Art
Glassware forming machines include forming and handling mechanisms, such as, among others, the funnel mechanism, which is simultaneously oscillated from an upper inoperative aperture and is lowered in order to be placed on a blank mold so as to receive and guide a molten glass gob fed thereto; the baffle mechanism, which usually operates in the same way as the funnel mechanism, for placement on the blank mold to act as a bottom thereof; the compression head and blow head mechanisms, which are similarly placed on the blank mold to provide a settlement blown and on the blow mold to blow a parison therein and form the article; and the take-out head which takes out an article that has just been formed and places it on a cooling dead plate. Each of these mechanisms is operated by cylinder and piston assemblies coupled to the forming and handling mechanisms for the operation thereof.
Typically, the forming and handling mechanisms are coupled to the piston rod of the cylinder and piston assemblies, which are connected to an operating fluid source by means of a network of rigid metallic conduits, screwed to the cylinder and piston assemblies. Usually, the feeding and discharging of fluid is controlled by needle valves provided at the rigid metallic conduits, for controlling the speed of the ascending and descending runs of the piston of the cylinder and piston assemblies.
Whenever maintenance is needed for cleaning purposes or for repairing or replacing parts of the cylinder and piston assemblies, or whenever changing of mechanisms or parts thereof is needed, for example when it is necessary to produce different types of glassware articles at the glassware forming machine, it is first necessary to unscrew each and every one of the rigid conduits connected to the cylinder and piston assemblies. Afterwards, it may also be necessary to separate the cylinder and piston assembly from the operating mechanisms. All of the foregoing entails the performance of cumbersome tasks, takes a lot of time, and is the cause of deformation and breaking of the rigid metallic conduits, resulting in high production costs.
Seeking an economic, simple, easy and rapid way to change the mechanisms, applicants invented a new fluid administration system for the operation of cylinder and piston assemblies, which is integrated with the cylinder cap of the cylinder and piston assembly, thereby eliminating all of the rigid metallic conduits, which heretofore were used to feed fluid, control the discharge of fluid, and control the speed of the ascending and descending runs of the piston of the cylinder and piston assembly of the forming and handling mechanisms; and which can be coupled and detached from the machine in a single operation, without the need to unscrew and then re-screw each and every conduit, thereby resulting in a system that is universally adaptable, economical and practical.
The fluid administration system is generally constituted by a network of fluid inlet and outlet passages connected to the intake and discharge passages of the cylinder, the centering ring and the mounting frame of the machine for the operation of actuating mechanisms; and a control valve system incorporated to the cylinder cap, to control the admission, and discharging of fluid and the speed of the ascending and descending runs of the piston of the cylinder and piston assemblies.
SUMMARY OF THE INVENTION
It is therefore a main object of the present invention, to provide a fluid administration system for the operation of cylinder and piston assemblies, that allows for rapid mounting and detaching of the cylinder and piston assemblies and actuating mechanisms, mainly for glassware forming and handling mechanisms.
It is also a main object of the present invention, to provide a fluid administration system for the operation of cylinder and piston assemblies, of the above disclosed type, which is integrated with the cylinder cap of the cylinder and piston assembly, allowing elimination of the usual network of rigid metallic conduits.
It is yet another main object of the present invention to provide a fluid administration system for the operation of cylinder and piston assemblies, of the above disclosed type, which can be coupled to and detached from the cylinder and piston assembly of the forming and handling mechanisms in a single operation.
It is yet another main object of the present invention to provide a fluid administration system for the operation of cylinder and piston assemblies, of the above-disclosed type, which is versatile, economical and practical.
These and other objects and advantages of the fluid administration system for the operation of cylinder and piston assemblies of the present invention, will be apparent from the following description of the specific embodiments of the invention, which is provided as a non-limiting illustration of one embodiment of the apparatus of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
, is a schematic cross sectional view of a typical cylinder and piston assembly of the prior art, in an ascending run, intended for a baffle mechanism, shown for comparative purposes;
FIG. 2
, is a view similar to
FIG. 1
, in a descending run, of the same cylinder and piston assembly.
FIG. 3
, is an schematic cross section view of a first embodiment of the fluid administration system of the present invention, in an ascending run, for the operation of a cylinder and piston assembly, intended for a baffle mechanism for a glassware forming machine;
FIG. 4
, is a view similar to
FIG. 3
, of the fluid administration system, in a descending run, for the same intended glassware forming mechanism;
FIG. 5
, is a schematic cross sectional view of a second embodiment of the fluid administration system of the present invention, in an ascending run, for the operation of a cylinder and piston assembly, intended for the funnel mechanism of a glassware forming machine; and
FIG. 6
, is a view similar to
FIG. 3
, of the fluid administration system, in a descending run, for the same intended funnel mechanism;
DETAILED DESCRIPTION OF CERTAIN PREFERRED EMBODIMENTS OF THE INVENTION
In the first place, a driving system used for the operation of mechanisms for forming and handling glassware articles, will be first described for purposes of comparison to the driving system of the present invention, intended for the rapid change of forming mechanisms in glassware forming machines, which will be described afterwards.
Additionally, the driving systems of the prior art and of the instant invention, will be firstly described structurally and afterwards functionally, describing the performance thereof in both runs (ascending and descending) of the piston.
Referring to
FIGS. 1 and 2
, a typical driving assembly for a forming mechanism in glassware forming machines, is constituted by:
a fluid source FS, in this case a manifold of the machine, providing air under pressure;
a fluid feeding conduit FC having a first end
1
connected to the fluid source FS, for feeding fluid, and a second end
2
;
a conduit network for discharging of fluid and controlling the piston runs of the driving system, comprising:
a first conduit C
1
, having a first end
3
, connected to an exhaust manifold E and including a first cartridge needle valve NV
1
for controlling the speed of fluid discharging, and a second end
4
;
a second conduit C
2
, having a first end
5
, connected to the exhaust manifold E and including a second cartridge needle valve NV
2
for controlling the speed of fluid discharge, and a second end
6
; and
a third conduit C
3
and a fourth conduit C
4
, each having a respective first end
7
,
7
′, connected to each other by means of a third cartridge needle valve NV
3
, for controlling the speed of fluid discharging, and a respective second end
8
,
8
′;
a centering ring CR mounted on a mechanism support frame SF of a machine, the centering ring CR and mechanism support frame SF, each having a first coinciding internal vertical passage PF, for feeding fluid from the fluid source FS or exhausting it through the exhaust manifold E, and a second vertical passage PP for feeding a piloting fluid for the purposes hereinafter described;
a cylinder CY, centrally mounted on the centering ring CR, including a top-opened chamber
10
having a centered bottom passage
11
, an open top end
12
, a first passage
13
a second passage
14
for a piloting fluid, coinciding respectively with the passages PF and PP of the centering ring CR and of the mechanism support frame SF, and a third passage
15
having a first end
16
and a second end
17
connected to the upper part of the chamber
10
;
a cylinder cap CC coupled on the top-open end
12
of the chamber
10
, having a central passage
20
, a valve housing
21
having an upper end
22
including a cap
23
, and a lower end
24
, a passage
25
coinciding with the passage
14
of the cylinder CY, for feeding piloting fluid into the valve housing
21
, and an internal network of passages which will be described in the following, connected to the network of conduits, for controlled fluid feeding and fluid discharging;
a reel valve RV placed into the valve housing
21
having a first, second, third and fourth connections a, b, c, d, respectively, which is operated by a pilot fluid feed trough the piloting passage PP, to an upper fluid-feed aperture (FIG.
1
), and a spring S abutting against the cap
23
of the upper end
22
of the valve housing
21
and on the reel valve RV, to place the reel valve RV at a lower fluid-feed aperture (
FIG. 2
) when the pilot fluid-feed is interrupted;
a piston P into the chamber
10
, including a first upper piston rod
26
passing through the upper central passage
20
of the cylinder cap CC, for the operation of a forming or handling mechanism (not illustrated), and a second lower piston rod
27
, passing through the bottom central passage
11
of the chamber
10
of the cylinder CY;
a fifth conduit C
5
, connecting the passages
13
and PF to a lower part of the chamber
10
of the cylinder CY, under the piston P, for feeding fluid thereto;
the above mentioned internal network of passages of the cylinder cap CC, as it is actually constituted, comprising:
a first horizontal passage P
1
, having a first end
30
to which the second end
2
of the feeding conduit FC is connected, and a second end
31
leading to a third aperture 3rd, of the valve housing
21
, coinciding with third input connection c of the reel valve RV, for the admission of fluid into the reel valve RV for distribution thereof;
a second passage P
2
integrated into a wall of the cylinder, having a first end
40
leading to a second aperture 2nd of the valve housing
21
, coinciding with the first output connection a of the reel valve RV, when this is at an upper aperture (
FIG. 1
) and a second end
41
connected to the internal passage
13
of the cylinder CY, coinciding with the passages PF of the centering ring CR and of the mechanism support frame SF, for the admission of fluid into the chamber
10
of the cylinder CY under the piston P, through the fifth conduit C
5
, for an ascending run of the piston P;
a third passage P
3
having a first end
50
leading to a fourth 4
th
aperture of the valve housing
21
, and a second end
51
connected to the first end
16
of the third passage
15
of the cylinder CY leading to the upper part of the chamber
10
of the cylinder CY, over the piston P, and having a first branch B
1
including an internal check valve CV, leading to the top-opened end
12
of the cylinder CY, and a second branch B
2
to which the second end
8
of the third conduit C
3
is connected; for controlling the discharge of fluid on the piston P in an ascending run of the piston P;
a fourth passage P
4
having a first end
60
leading to a fifth aperture of the valve housing
21
, and a second end
61
to which the second end
4
of the conduit C
1
is connected;
a fifth passage P
5
having a first end
70
to which the second end
8
′ of the fourth conduit C
4
is connected and a second end
71
leading to the top-opened end
12
of chamber
10
of the cylinder CY; and
a sixth passage P
6
having a first end
80
to which the second end
6
of the second conduit C
2
is connected, and a second end
81
leading to a first aperture 1
st
of the valve housing
21
.
For the operation of the driving system of the prior art, as illustrated in
FIG. 1
of the drawings, to an ascending run of the piston P, piloting fluid is firstly fed through passages
14
and
25
to the valve housing
21
in order to rise the reel valve RV at an upper operating aperture.
Operating fluid is then fed from the fluid source FS through conduit FC to the passage P
1
leading to the third aperture 3
rd
of the valve housing
21
coinciding with the connection c of the reel valve RV while it is in the upper aperture, leaving through the connection a of the reel valve RV which is at the second 2
nd
aperture of the valve housing
21
, to the passages P
2
and
13
, PF and fifth conduit C
5
to be fed through the lower part of cylinder CY into the chamber
10
of the cylinder CY under the piston P in order to rise it to an upper operating aperture, rising in turn the piston rod
26
.
Any fluid existing in the chamber
10
over the piston P exits, through passages P
5
, to conduit C
4
and, through passages
15
,
51
, and second branch B
2
, to conduit C
3
, in order to control the upper run of the piston P by means of the needle valve NV
3
, and through the passage P
3
to the fourth aperture
4
th of the valve housing
21
, leaving through passage P
4
, to the first conduit C
1
, in order to further cushioning the ascending run of piston P by means of the first needle valve NV
1
.
For a descending run of the piston P, the piloting fluid is directed to the valve chamber, so that the spring S abutting against the cap
23
of the valve housing
21
, pushes the reel valve RV downwardly, to a lower operating aperture.
Operating fluid is then fed from the fluid source FS through conduit FC to the passage P
1
leading to the first connection “a” of the reel valve RV while it is in the third 3
rd
aperture of the valve housing, leaving through the connection “d” of the reel valve RV at the fourth 4
th
aperture of the valve housing
21
to the passage P
3
, first branch B
1
in which the check valve CV is in a aperture allowing passage of fluid to the top opened en
12
of chamber
10
over the piston P, and through passages
51
and
15
to the upper part of the cylinder CY also over the piston P, in order to lower it to an lower operating aperture, lowering in turn the piston rod
27
.
The fluid existing in the chamber
10
under the piston P leaves, through the fifth conduit C
5
, through passages PF,
13
and P
2
, leading to the second aperture of the valve housing
21
, leaving through passage P
6
, to the second conduit C
2
, in order to control the descending run of piston P by means of the second needle valve NV
2
. Conduits C
3
and C
4
remain in this case blocked by means of needle valve NV
3
.
One preferred embodiment of the driving system allowing rapid changing of actuating mechanisms, mainly glassware forming mechanisms, comprises:
a single conduit
100
having a first end
101
connected to the fluid source FS, for feeding fluid, and a second end
102
;
a centering ring
200
mounted on a mechanism support frame SF of the machine, having a fluid feeding passage
201
, the centering ring
200
and the mechanism support frame SF, both having a plurality of coinciding passages to be described in the following;
a cylinder
300
, centrally mounted on the centering ring
200
, including a top-opened chamber
301
having a centered bottom passage
302
, an opened top end
303
, a fluid first feeding passage
304
and a second fluid passage
305
connected to a lower part of the chamber
301
, and a plurality of passages coinciding with the plurality of passages of the centering ring
200
and of the support frame SF, to be described in the following;
a cylinder cap
400
coupled on the top-opened end
303
of the chamber
301
, having a central passage
401
, a valve housing
402
vertically practiced at the cylinder cap
400
, having an upper end
403
including a cap
404
, and a lower end
405
, and an internal network of passages which will be described in the following;
a reel valve RV placed into the valve housing
402
having a first, a second, a third and a fourth connections “a”, “b”, “c”, and “d”, which is operated by a pilot fluid feed trough a piloting conduit
406
, connected to the lower end
405
of the valve housing
402
, to an upper fluid-feed aperture;
a spring
407
into the valve housing
402
, abutting against the cap
403
of the upper end of the valve housing
402
and on the reel valve RV, to place the reel valve RV at a lower fluid-feed aperture when the pilot fluid-feed is interrupted;
a piston
500
into the chamber
301
, including a first piston rod
501
passing through the upper central passage
401
of the cylinder cap
400
, for the operation of a forming or handling mechanism (not illustrated), and a second piston rod
502
, passing through the bottom central passage
302
of the chamber
301
of the cylinder
300
;
the plurality of coinciding passages of the cylinder
300
, the centering ring
200
and the support frame SF, comprise:
a passage PP for feeding a piloting fluid to the valve housing
402
, a passage PF, a passage PD
1
, and a passage PD
2
, all of them passing throughout the cylinder
300
, centering ring
200
and mechanism support frame SF, for the purpose which will be described in the following.
The above mentioned internal network of passages of the cylinder cap
400
, in accordance with the driving system of the present invention, by which the conduits C
1
to C
4
of the driving system of the prior art are eliminated, comprises:
a first passage P
1
, having a first end E
1
connected to the fluid feeding passages
304
of the cylinder
300
and
201
of the centering ring, and a second end E
2
leading to a third aperture 3
rd
of the valve housing
402
, coinciding with the third connection “c” of the reel valve RV;
a second passage P
2
, having a first end E
3
leading to the second aperture 2
nd
of the valve housing
402
coinciding with the first connection “a” of the reel valve RV, and a second end E
4
connected to the to the passage PF passing through the cylinder
300
, the centering ring
200
and of the support frame SF, for feeding the fluid, trough a second conduit C
2
connected to the lower part of the chamber
301
of the cylinder
300
under the piston
500
, for an ascending run of the piston
500
;
a third passage P
3
having a first end E
5
leading to a fourth aperture 4
th
of the valve housing
402
, and a second end E
6
connected to the passage
305
leading to the upper part of the chamber
301
of the cylinder
300
through an aperture leading over the piston
500
, and having a first branch B
1
having a first end E
7
connected to the third passage P
3
by means of a check valve CHV, and a second end E
8
leading to the upper part of the chamber
301
of the cylinder
300
, and a second branch B
2
including a first needle valve
600
, having a first end E
9
connected to the third passage P
3
, and a second end E
10
connected to the cylinder
300
, leading also to the upper part of the chamber
301
;
a fourth passage P
4
having a first end E
11
leading to a fifth aperture 5
th
of the valve housing
402
, an intermediate portion E
12
including a second needle valve
700
for controlling the velocity of the ascending run of the piston
500
, introduced through an opened top of the cylinder
300
and a second end E
13
connected to passage PD
1
passing through the cylinder
300
, the centering ring
200
and the support frame SF; and
a fifth passage P
5
having a first end E
14
leading to a first aperture 1
st
of the valve chamber
402
, an intermediate portion E
15
including a third needle valve
800
introduced through an opened top of the cylinder
300
and a second end E
16
connected to passage PD
2
passing through the cylinder
300
, the centering ring
200
and the mechanism support frame SF.
Conduit C
2
, connecting the passage PDF with the lower part of the chamber
301
, can advantageously be integrated to a wall of the cylinder
300
, as a passage CP
2
, by modifying the thickness of the same, in order to additionally avoid further conduits and connections.
For the operation of the driving system of the present invention illustrated in
FIG. 3
of the drawings, to an ascending run of the piston P, piloting fluid is firstly fed through passage PP to the valve chamber
402
in order to raise the reel valve RV at an upper operating aperture.
Operating fluid is then fed from the fluid source FS through conduit
100
to the passage
201
of the centering ring
200
and passage PF of the cylinder
300
, and passage P
1
leading to the third connection “c” of the reel valve RV while it is in the upper aperture, leaving through the connection “a” of the reel valve RV to the passages P
2
, PF and second conduit C
2
to be fed through the lower part of cylinder
300
into the chamber
301
under the piston
500
in order to raise it to an upper operating aperture.
Any fluid existing in the chamber
301
over the piston
500
leaves, through passages
305
of the cylinder
300
, and passage P
3
, through the check valve CV, and through the second branch B
2
of conduit P
3
, through the needle valve
600
, and passage P
3
, leading to the fourth aperture 4
th
of the valve housing
402
, leaving through the fifth aperture 5
th
of the valve housing
402
and exhausted through passage P
4
further controlled by the second needle valve
700
, and passage PD
1
, so that the speed of the upper run of the
500
is controlled by the needle valves
600
and
700
.
For a descending run of the piston
500
, the piloting fluid is interrupted to the valve chamber
402
, so that the spring
407
abutting against the cap
403
of the valve chamber
402
, pushes the reel valve RV downwardly, to a lower operating aperture.
Operating fluid is then fed from the fluid source FS through conduit
100
to the passage
201
of the centering ring
200
and passage P
1
, leading to the first connection “a” of the reel valve RV while it is in the lower aperture, leaving through the connection “d” of the reel valve RV, to be feed through the passages P
3
and
304
to the chamber
301
over the piston
500
, and through first branch B
1
in which the check valve CV is in a aperture allowing passage of fluid to the top-opened end
303
of chamber
301
also over the piston
500
, and through second branch B
2
at a speed controlled by the first needle valve
600
, to the top-opened end
303
of the chamber
301
also over the piston
500
.
The fluid existing in the chamber
301
under the piston P leaves, through the second conduit C
2
, through passages PDF and P
2
, leading to the second aperture 2
nd
of the valve chamber
402
, leaving through passages P
5
and PD
2
, in order to control the descending run of piston
500
by means of the needle valve
800
.
Claims
- 1. A fluid administration system for the operation of a cylinder and piston assembly for actuating mechanisms, the cylinder and piston assembly being of the type including, in combination: a support frame; a centering ring mounted on the support frame; a cylinder centrally mounted on the centering ring, including a cylinder cap, an internal chamber, and a piston into the internal chamber, having piston rods to be coupled to the actuating mechanisms; a valve housing including a first aperture, a second aperture, a third aperture, a fourth aperture, a fifth aperture, and operating valve means in the valve housing, having a first connection, a second connection, a third connection, and a fourth connection, for coinciding with the apertures of the valve housing, for controlling the feeding and discharging of operating fluid to the cylinder and piston assembly; the fluid administration system comprising:a network of fluid feeding and discharging passages provided with the cylinder, the centering ring and the support frame, with the network being integral to the cylinder cap of the cylinder and piston assembly, the network providing operating fluid to the cylinder and piston assembly for ascending and descending runs of the piston and to allow the discharging of the operating fluid from the cylinder and piston assembly; a passage network provided at the cylinder cap, connected to the network of fluid feeding and discharging passages; speed-control valve means located in each passage of the passage network, to control the speed of the discharging of the operating fluid from the cylinder and piston assembly, and to control the speed of the ascending and descending runs of the piston of the cylinder and piston assembly; and a reel valve placed into the valve housing and having positions located adjacent to an upper fluid-feed aperture and a lower fluid-feed aperture respectively, the reel valve having at least one connection to a pilot fluid feed through a piloting conduit, connected to a lower end of the valve housing, to the upper fluid-feed aperture.
- 2. The fluid administration system according to claim 1, wherein the network of fluid feeding and discharging passages includes:a first fluid feeding conduit for feeding operating fluid to the cylinder and piston assembly, having: a first end connected to a fluid source for feeding the operating fluid; and second end; a first fluid feeding passage passing through the centering ring and the cylinder, having: a first end connected to the second end of the first fluid feeding conduit; and a second end; a second fluid passage passing through the cylinder, the centering ring and the support frame, having: a first end; and a second end; a second fluid feeding conduit having: a first end connected to the second end of the second fluid passage; and a second end, connected to a lower part of the cylinder in communication with the internal chamber of the cylinder, for feeding the operating fluid to the lower part of the chamber of the cylinder, under the piston, when the reel valve is positioned at the upper fluid-feed aperture, for an ascending run of the piston, and for discharging of the operating fluid from the lower part of the chamber of the cylinder, when the reel valve is positioned at the lower fluid-feed aperture, for a descending run of the piston; a piloting fluid passage passing through the support frame, the centering ring and the cylinder, for feeding a piloting fluid to the valve housing, in order to connect the operating valve means to an upper aperture; a third fluid passage at the cylinder having: a first end; and a second end connected to and in communication with an upper part of the cylinder; and fourth and fifth passages, both passing through the cylinder, the centering ring and the support frame, for passing and discharging of the operating fluid from the cylinder.
- 3. The fluid administration system according to claim 2, wherein the second fluid passage is integrated into a wall of the cylinder as a passage having the first end of the second fluid passage connected to a second aperture of the valve housing, and having the second end of the second fluid passage connected to a lower part of the cylinder in communication with the internal passage of the cylinder.
- 4. The fluid administration system according to claim 2, wherein the passage network of the cylinder cap includes:the first fluid feed conduit having: the first end connected to the first fluid feeding passage passing through the centering ring and the cylinder, for feeding operating fluid to the chamber of the cylinder; and the second end leading to the third aperture of the valve housing, coinciding with the third connection of the reel valve into the valve housing; the second fluid feeding passage having: the first end leading to the second aperture of the valve housing coinciding with the first connection of the reel valve of the valve housing; and the second end connected to the second fluid feeding passage passing through the cylinder, the centering ring, and the support frame, for feeding fluid through the second fluid feed conduit to the lower part of the cylinder in communication with the chamber of the cylinder under the piston, for the ascending run of the piston; the third fluid feeding passage having: the first end leading to the fourth aperture of the valve housing; and the second end connected to the third fluid feeding passage of the fluid feeding and discharging passages, leading to the upper part of the cylinder in communication with the chamber of the cylinder over the piston, and including: a first branch having: a first end connected to the third fluid feeding passage by means of a check valve; and a second end leading to the upper part of the chamber of the cylinder; and a second branch including a first needle valve, and having: a first end connected to the third fluid feeding passage; and a second end leading to the upper part of the chamber of the cylinder, for a controlled speed discharging of the operating fluid over the piston, at the ascending run of the piston, when the reel valve is at the upper operating aperture, and for feeding the operating fluid when the reel valve is at the lower operating aperture, for the descending run of the piston; the fourth fluid feeding passage having: a first end leading to the fifth aperture of the valve housing; an intermediate portion including a second needle valve, introduced through an opened toy of the cylinder; and a second end connected to the first fluid feeding passage of the network of fluid feeding and discharging passages passing through the cylinder, the centering ring and the support frame, for a controlled speed discharging of the operating fluid from the upper part of the chamber of the cylinder, over the piston, when the reel valve is at the upper operating aperture; and the fifth passage having: a first end leading to the first aperture of the valve housing; an intermediate portion including a third needle valve introduced through an opened top of the cylinder; and a second end connected to the second fluid feeding passage of the fluid feeding and discharging network of passages passing through the cylinder, the centering ring and the mechanism support frame, for controlled speed discharging of the operating fluid from the lower part the chamber of the cylinder under the piston, when the reel valve is at the lower operating aperture.
US Referenced Citations (11)