US3793945A - Hydraulic press with box- and column-type frame - Google Patents

Hydraulic press with box- and column-type frame Download PDF

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Publication number
US3793945A
US3793945A US00211280A US3793945DA US3793945A US 3793945 A US3793945 A US 3793945A US 00211280 A US00211280 A US 00211280A US 3793945D A US3793945D A US 3793945DA US 3793945 A US3793945 A US 3793945A
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US
United States
Prior art keywords
piston
cylinder
bedplate
frame
power press
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.)
Expired - Lifetime
Application number
US00211280A
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English (en)
Inventor
E Nowak
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PRZED DOSWIADCZALNE PRAS AUTOM
PRZEDSIEBIORSTWO DOSWIADCZALNE PRAS AUTOM TLOCZNIKOW PONAR HYDOMAT P
Original Assignee
PRZED DOSWIADCZALNE PRAS AUTOM
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by PRZED DOSWIADCZALNE PRAS AUTOM filed Critical PRZED DOSWIADCZALNE PRAS AUTOM
Application granted granted Critical
Publication of US3793945A publication Critical patent/US3793945A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/32—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure

Definitions

  • a hydraulic power press has a box-shaped frame whose top defines a work space with a bedplate received in that frame, the frame bottom being rigid with a hydraulic cylinder whose piston carries the bedplate. Frame and cylinder are interconnected by columns guiding the bedplate within the frame.
  • the piston has a downwardly projecting rod terminating in an annular flange forming a shoulder which coacts with a set of plungers within the cylinder adapted to be pressurized for moving the piston with the bedplate downwardly.
  • the upper limit of the working stroke of the piston is defined by a rotatable ring threadedly engaging the lower end of the cylinder to form an adjustable abutment for the piston flange.
  • the lower limit of the return stroke is determined by a stud, projecting downwardly from the piston, which on descending coacts with the body of a slide valve whose mounting is fixedly suspended from the cylinder and which, besides cutting off the flow of pressure fluid to the downwardly acting plungers, also cushions the descent of the piston.
  • the stud is threadedly lodged in the piston and can be rotated by a bevel-gear transmission inside the bedplate and the piston for adjusting the lower end Q FDSP QEEKQEE-.
  • An object of my present invention is to provide a more compact power press of this general type which nevertheless is highly resistant to torque and bending stresses.
  • Another object is to provide a simplified driving mechanism for the bedplate of such a press.
  • a further object is to provide conveniently operable means in such a press for adjusting the lower limit of the downward or opening stroke of the bedplate, e.g. for the purpose of giving access to a defective tool which is to be repaired.
  • a power press comprises a hydraulic cylinder below its bedplate, the cylinder being rigid with the bottom plate of the press frame and having a wall provided with an array of vertical bores; a piston in the cylinder, rigid with the bedplate, has a downwardly projecting extremity provided with a peripheral shoulder engaged by a set of vertically movable plungers in the array of cylinder bores.
  • the valve may be carried on a stationary support secured to the cylinder while the piston has an adjustable valve-engaging extension enabling a variation of the lower limit of its descending stroke.
  • This extension may comprise a stud threadedly received in an axial bore of the piston and coupled with a vertical shaft in that bore which can be rotated through a set of bevel gears from a horizontal shaft lodged in the bedplate.
  • the upstroke of the piston can be limited by adjustable abutment means engageable from below by the peripheral shoulder coacting with the plungers of the cylinder.
  • FIG. 1 is an elevational view, partly in section, of a press embodying my invention.
  • FIG. 2 is a cross-sectional view taken on the line Il-II of FIG. 1.
  • the press frame which in FIG. 1 has been partly indicated in broken lines, comprises a box-like structure 3 with a top plate 1 and a bottom plate 6 bracketing a bedplate 4 which is vertically guided by a set of columns 2 traversing that structure; the columns are fastened to the frame by nuts 26.
  • Bottom plate 6 has a central opening receiving the upper end of a hydraulic cylinder 22, the latter having a peripheral flange bearing upon the underside of that plate unto which it is held by the columns 2.
  • Bushings 5 surround the columns 2 to facilitate the sliding of bedplate 4 therealong.
  • Cylinder 22 contains a piston 23 threadedly secured to the bedplate 4, its piston rod 8 projecting downwardly from the cylinder and carrying at its lower end a buffer 15 overlain by a bumper plate 16.
  • the piston and its rod are guided in cylinder 22 by annular bushings 21 and 24 providing peripheral clearance between these members.
  • a seal 19 insures fluidtight contact between the piston and the cylinder.
  • the lower part of the cylinder is formed with an array of vertical bores 30 accommodating respective plungers 20 whose downwardly projecting extremities bear upon the bumper plate 16.
  • Each bore 30 communicates at its top with an inlet 31 to which pressure fluid may be admitted as indicated by an arrow P.
  • the lower end of cylinder 22 is externally threaded and surrounded by a complementarily threaded ring 18 forming an abutment for bumper plate 16 in an upper limiting position of the piston 23. This position can be adjusted with the aid of a worm 17 in engagement with mating teeth on the outer periphery of ring 18.
  • Bedplate 4 has a lateral bore 31 accommodating a horizontal shaft 25 which, via bevel gears 33, is drivingly coupled with a vertical shaft 7 passing through an axial bore 34 of piston 23.
  • the lower, widened part of bore 34 is in screw-threaded engagement with a stud 10 which is drivingly coupled with shaft 7 so as to form an axially adjustable downward extension of piston 23.
  • piston 23 and bedplate 4 are elevated into a working position by the introduction of oil into the cylinder 22, underneath the piston head, under the control of a nonillustrated valve. This results in the shaping of a workpiece by a tool carried on the bedplate 4.
  • bumper plate 16 now contacting the abutment ring 18, oil is admitted via inlets 31 into bores 30 ,to exert pressure through the plungers 22 upon the plate 16 so that the piston 23 begins to descend.
  • the stud 10 strokes the slider of valve 13 to stop the inflow of oil into the bores 13; this action also helps absorb the shock of arresting the piston stroke.
  • the limits of this stroke can be adjusted with the aid of worm 17 and shaft 25.
  • a hydraulic power press comprising: a frame provided with a top plate and a bottom plate; a vertically movable bedplate in said frame defining a work space with said top plate; a hydraulic cylinder below said bedplate rigid with said bottom plate, said cylinder having a wall provided with an array of vertical bores;
  • valve means in the path of said piston engageable by same upon downward movement thereof under pressure of said fluid for cutting off the fluid pressure in said bores to arrest the descent of said piston from a working position into which the piston has been hydraulically elevated.
  • valve means is provided with a stationary support secured to said cylinder, said piston being provided with an adjustable extension engageable with said valve means for varying the lower limit of its descending stroke.
  • a power press as defined in claim 2 wherein said extension comprises a stud threadedly received in an axial bore of said piston, further comprising mechanism in said axial bore accessible through said bedplate for rotating said stud.
  • a power press as defined in claim 3 wherein said mechanism comprises a vertical shaft in said axial bore, a horizontal shaft in said bedplate and a set of bevel gears interconnecting said shafts.
  • a power press as defined in claim 5 wherein said abutment means comprises a peripheral ring threadedly engaging said cylinder and drive means for rotating said ring.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Automatic Assembly (AREA)
US00211280A 1971-01-05 1971-12-23 Hydraulic press with box- and column-type frame Expired - Lifetime US3793945A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL14547671A PL70013B1 (fr) 1971-01-05 1971-01-05

Publications (1)

Publication Number Publication Date
US3793945A true US3793945A (en) 1974-02-26

Family

ID=19953123

Family Applications (1)

Application Number Title Priority Date Filing Date
US00211280A Expired - Lifetime US3793945A (en) 1971-01-05 1971-12-23 Hydraulic press with box- and column-type frame

Country Status (10)

Country Link
US (1) US3793945A (fr)
CH (1) CH546640A (fr)
DD (1) DD97381A5 (fr)
DE (1) DE2165350A1 (fr)
FR (1) FR2119787A5 (fr)
GB (1) GB1371390A (fr)
HU (1) HU167036B (fr)
IT (1) IT946333B (fr)
PL (1) PL70013B1 (fr)
SU (1) SU465773A3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4166415A (en) * 1978-04-21 1979-09-04 Gulf & Western Manufacturing Company Press having overload responsive slide shut height adjusting mechanism
US4860646A (en) * 1987-02-10 1989-08-29 Marathon Corporation Compactor with hydraulic dwell and method
US20020107597A1 (en) * 2000-12-29 2002-08-08 Juergen Fahrenbach System and method for defining the construction of a press

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL132981B1 (en) * 1982-04-16 1985-04-30 Osrodek Badawczorozwojowy Podstaw Technologii I Konstrukcji Maszyn Press with box frame

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2499310A (en) * 1948-02-17 1950-02-28 Hathaway Stanley Tobacco press
US2501652A (en) * 1946-03-27 1950-03-28 Hutchens Ind Method of and apparatus for stuffing oil filter elements
US3444806A (en) * 1966-07-09 1969-05-20 Nippon Kokan Kk Apparatus for pressing scrap
US3452632A (en) * 1966-08-01 1969-07-01 W A Whitney Mfg Co Shearing press with interchangeable tool cartridges
US3460363A (en) * 1966-03-04 1969-08-12 Frederick W Grantham Laundry extractor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2501652A (en) * 1946-03-27 1950-03-28 Hutchens Ind Method of and apparatus for stuffing oil filter elements
US2499310A (en) * 1948-02-17 1950-02-28 Hathaway Stanley Tobacco press
US3460363A (en) * 1966-03-04 1969-08-12 Frederick W Grantham Laundry extractor
US3444806A (en) * 1966-07-09 1969-05-20 Nippon Kokan Kk Apparatus for pressing scrap
US3452632A (en) * 1966-08-01 1969-07-01 W A Whitney Mfg Co Shearing press with interchangeable tool cartridges

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4166415A (en) * 1978-04-21 1979-09-04 Gulf & Western Manufacturing Company Press having overload responsive slide shut height adjusting mechanism
US4860646A (en) * 1987-02-10 1989-08-29 Marathon Corporation Compactor with hydraulic dwell and method
US20020107597A1 (en) * 2000-12-29 2002-08-08 Juergen Fahrenbach System and method for defining the construction of a press

Also Published As

Publication number Publication date
HU167036B (fr) 1975-07-28
GB1371390A (en) 1974-10-23
PL70013B1 (fr) 1973-12-31
IT946333B (it) 1973-05-21
DE2165350A1 (de) 1972-08-17
FR2119787A5 (fr) 1972-08-04
DD97381A5 (fr) 1973-05-05
SU465773A3 (ru) 1975-03-30
CH546640A (de) 1974-03-15

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