EP1362189A1 - A device for guiding a plunger of a jack - Google Patents
A device for guiding a plunger of a jackInfo
- Publication number
- EP1362189A1 EP1362189A1 EP01905814A EP01905814A EP1362189A1 EP 1362189 A1 EP1362189 A1 EP 1362189A1 EP 01905814 A EP01905814 A EP 01905814A EP 01905814 A EP01905814 A EP 01905814A EP 1362189 A1 EP1362189 A1 EP 1362189A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hinged
- shafts
- plunger
- con
- axes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1471—Guiding means other than in the end cap
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/007—Means for maintaining the press table, the press platen or the press ram against tilting or deflection
Definitions
- the invention relates to a device for guiding a plunger of a jack. Specifically, though not exclusively, the invention is usefully applied in the field of hydraulic jacks in presses, having large non-circular plungers (elliptic, oval, rectangular etc.) Background Art
- pistons which are of as close a shape as possible to the shape of the objects to be pressed (i.e. rectangular pistons with bevelled edges, or at least oval).
- the present invention offers a valid and viable alternative to the above-described hydraulic-electronic systems, and is characterised by a completely mechanical operation and structure.
- the advantages of the invention are mainly connected with its substantial simplicity, making it extremely reliable.
- figure 1 shows part of a schematic and partly-sectioned vertical elevation of a press equipped with the device of the invention
- figure 2 is a perspective schematic view of the invention. Disclosure of Invention
- 1 denotes in its entirety a press having a jack 2 with a non-circular section, in particular elliptical.
- the press 1 is used to compact ceramic powders 8 to obtain generally rectangular products.
- the rectangular pressing surface is very large and the elliptical plunger 3 of the jack 2 is also of a considerable size.
- the problem of raising and lowering the plunger 3 uniformly, i.e. with the mobile pressing surface constantly parallel to the fixed pressing plane, is solved by using at least one hinged mechanism, basically a parallel-bar link comprising the following members: two con rods 4 having their first ends hinged to the plunger 3 by means of pivots 14; two squared elements 5, 6 hinged on two shafts 15, 16 having axes which are parallel to those of the pivots 14 and to which the second ends of the con rods 4 are hinged at predetermined distances from the shafts 15, 16; a connecting element, i.e. a connection element functioning as a con rod 7 and having ends hinged to the squared elements 5, 6.
- This hinged mechanism has the special characteristic that at least one of its members is elastically deformable to a predetermined degree.
- two hinged mechanisms are present, having as mentioned an overall parallelogram shape, being identical and arranged symmetrically with respect to a halfway median plane parallel to the direction of the plunger 3 stroke.
- the symmetrically arranged and aligned squared elements 5, 6 of the two hinged mechanisms are both solidly constrained to ends of the two shafts 15, 16.
- the shafts 15 and 16 are coupled in seatings which are made solid to the jack 2, and are freely rotatable about their own axes.
- the elastically deformable members are mainly the con rods 4 which are so conformed and structured as to exhibit a flexional elastic deformability, enabling their length to vary.
- the con rods 4 exhibit a non-straight natural configuration even in the absence of flexional solicitation.
- any lack of uniformity in the ceramic material induces the plunger to follow the non-uniform arrangement of the material and to be arranged not-exactly parallel to the fixed pressing plane.
- This tendency of the plunger is opposed by the two hinged mechanisms, but the elastic deformability of the con rods 4 enables the plunger to adapt and assume a not-perfectly-parallel position with regard to the fixed pressing plane.
- This elastic deformability is calculated in such a way as to enter into play during the pressing phase when the forces reach certain predetermined levels.
- Advantages of the present invention are its simplicity and reliability. Furthermore, the invention guarantees optimum pressing of the ceramic powders
- the invention protects the mechanism against any eventual overloads.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
- Prostheses (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Portable Nailing Machines And Staplers (AREA)
- Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
- Knitting Machines (AREA)
- Press Drives And Press Lines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2001/001947 WO2002066843A1 (en) | 2001-02-20 | 2001-02-20 | A device for guiding a plunger of a jack |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1362189A1 true EP1362189A1 (en) | 2003-11-19 |
EP1362189B1 EP1362189B1 (en) | 2004-09-01 |
Family
ID=8164303
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01905814A Expired - Lifetime EP1362189B1 (en) | 2001-02-20 | 2001-02-20 | A device for guiding a plunger of a jack |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1362189B1 (en) |
AT (1) | ATE275241T1 (en) |
DE (1) | DE60105320T2 (en) |
ES (1) | ES2227129T3 (en) |
PT (1) | PT1362189E (en) |
WO (1) | WO2002066843A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE382644C (en) * | 1923-10-04 | Eulenberg Moenting & Co M B H | Press, especially for cooling purposes, or the like. Machine tool | |
DE872733C (en) * | 1951-11-16 | 1953-04-02 | Karl Keck | Press with ram driven in several points |
FR1062361A (en) * | 1952-09-01 | 1954-04-21 | Renault | Improvements to presses driven by pressurized fluid |
DE1261759B (en) * | 1958-02-22 | 1968-02-22 | Becker & Van Huellen | Hydraulic press with press table guidance |
DE2919012A1 (en) * | 1979-05-11 | 1980-11-20 | Schloemann Siemag Ag | OVERLOAD PROTECTION ON HYDRAULIC FORMING PRESSES, IN PARTICULAR SHEET FORMING PRESSES |
DE4401507A1 (en) * | 1994-01-20 | 1995-08-03 | Haendle Gmbh & Co Kg | Guiding a pressure beam in the machine frame of a press, in particular roof tile press |
-
2001
- 2001-02-20 EP EP01905814A patent/EP1362189B1/en not_active Expired - Lifetime
- 2001-02-20 WO PCT/EP2001/001947 patent/WO2002066843A1/en active IP Right Grant
- 2001-02-20 AT AT01905814T patent/ATE275241T1/en not_active IP Right Cessation
- 2001-02-20 DE DE60105320T patent/DE60105320T2/en not_active Expired - Lifetime
- 2001-02-20 ES ES01905814T patent/ES2227129T3/en not_active Expired - Lifetime
- 2001-02-20 PT PT01905814T patent/PT1362189E/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO02066843A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2002066843A1 (en) | 2002-08-29 |
ES2227129T3 (en) | 2005-04-01 |
EP1362189B1 (en) | 2004-09-01 |
ATE275241T1 (en) | 2004-09-15 |
DE60105320D1 (en) | 2004-10-07 |
PT1362189E (en) | 2005-01-31 |
DE60105320T2 (en) | 2005-09-29 |
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