US3643496A - Hydraulic load test device - Google Patents

Hydraulic load test device Download PDF

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Publication number
US3643496A
US3643496A US25416A US3643496DA US3643496A US 3643496 A US3643496 A US 3643496A US 25416 A US25416 A US 25416A US 3643496D A US3643496D A US 3643496DA US 3643496 A US3643496 A US 3643496A
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United States
Prior art keywords
posts
crossbeam
frame
hydraulic
pressure
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Expired - Lifetime
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US25416A
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English (en)
Inventor
Vladimir Zajic
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Skoda np
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Skoda np
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Publication date
Application filed by Skoda np filed Critical Skoda np
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Publication of US3643496A publication Critical patent/US3643496A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure

Definitions

  • This invention relates to a load test device for examination of load test pieces by pull, pressure or bending and particularly for examination of larger test pieces according to a predetermined program.
  • a load test device with an open mobile frame, preferably of rectangular shape, with an upper and lower crossbeam, slidable along posts, connected at the top by a crossbeam, with a second crossbeam connecting the posts within the opening of said slidable frame and with sets of hydraulic elastic steel cushions inserted between the second crossbeam connecting the posts and the upper and lower crossbeam respectively of the slidable frame and with means for supporting the test piece between the slidable frame and a stable part of the load test device.
  • FIG. 2 is a cross-sectional top view along a plane indicated in FIG. 1 by the line ll-ll,
  • H0. 3 an elevation of the central part of the machine at a larger scale with indicated means controlling the pressure in the steel cushions.
  • the load test device comprises a baseplate 10, to which four vertical posts 11 are fixed, which are connected at the top by a first removable crossbeam 2 which remains fixed during the course of operation of the testing device.
  • the position of the crossbeam 2, however, with respect to the posts 1 and 2 can be made adjustable prior to start the tests.
  • the upper crossbeam 3 and the lower crossbeam 5 of the frame 6 are provided with holes 12 for free passage of the posts ii.
  • the first crossbeam 2 is provided with a suitable cavity 113 in which is inserted the head of a test piece 9, which head is usually T- shaped.
  • a similar cavity M for the other end of the test piece is provided in the upper crossbeam 3 ofthe frame ti.
  • a second crossbeam t is fixed to the posts l in their lower half. within the opening of the frame a, and serves as support for two sets 7 and 8 of hydraulic elastic steel cushions resting with their other surfaces against the upper crossbeam 3 and the lower crossbeam 5 respectively of the slidable frame is.
  • the internal spaces of the steel cushions 7 and ii are individually connected by way of spring-loaded return valves 17, 18 to conduits l5 and 16 respectively, supplying a suitable pressure medium, for instance oil to the cushions 7 and 8.
  • the conduits l5 and 116 are connected to a sliding valve l9 which alternately connects one set 7 or ii of the spring cushions to a pressure conduit 20 while the other set is connected to a conduit 21 or 22 leading to the waste.
  • the described device operates as follows:
  • test piece 9 suspended or supported within the cavities l3 and lid of the first crossbeam 2 of the posts l and of the upper crossbeam 3 of the frame 6, is exposed to pressure or pull generated by one of the sets '7 or ii of hydraulic elastic steel cushions whereby the stress of the force transmitted to the test piece 9 is taken over substantially only by the first crossbeam 2, by the second crossbeam i and by the posts ll, all these elements remaining stable in the course of the whole test.
  • the hydraulic medium is supplied to the steel cushions 7 or 8 by way of the slide valve 3.9 according to a predetermined program, which can be easily maintained by adjusting the pressure in the pressure conduit 20.
  • a predetermined program which can be easily maintained by adjusting the pressure in the pressure conduit 20.
  • the cushions are individually connected to the supply conduits 11% or i s by way of return valves 17 or iii, an occasional failure of some cushions need not cause the failure of the whole device, as it is automatically disconnected from the pressure supply.
  • the construction of the device can remain relatively light, so that the cost of the device is equally reduced while the control is easy and reliable.
  • a hydraulic load test device comprising in combination:
  • a frame comprising an upper crossbeam, a lower beam and two lateral walls
  • the upper and lower crossbeam of said frame provided with openings for free passage of the posts through said openings
  • a pressure conduit for the pressure medium serving both for the supply and removal of the pressure from the steel cushions
  • each of the steel cushions being connected to the pressure conduit by means of an automatic disconnect valve.
  • a hydraulic load test device comprising means for supporting a test piece: between a pair of opposed hydraulic pressure assemblies, each of said assemblies comprising a plurality of axially superimposed closed chamber members each semblies is movably mounted on a base frame for reciprocation toward and away from said test piece.
  • each of said cushion members is provided with an associated regulating valve, each valve being connected to a common conduit having valve means connected to the source of hydraulic media for selectively pressurizing one or the other of said assemblies.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
US25416A 1969-04-10 1970-04-03 Hydraulic load test device Expired - Lifetime US3643496A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS252869 1969-04-10

Publications (1)

Publication Number Publication Date
US3643496A true US3643496A (en) 1972-02-22

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ID=5362669

Family Applications (1)

Application Number Title Priority Date Filing Date
US25416A Expired - Lifetime US3643496A (en) 1969-04-10 1970-04-03 Hydraulic load test device

Country Status (3)

Country Link
US (1) US3643496A (de)
BE (1) BE748671A (de)
DE (1) DE2016509C3 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731595A (en) * 1971-12-01 1973-05-08 Borg Warner Cylindrical bellows seal for extensive axial movement
US3975989A (en) * 1973-04-19 1976-08-24 Rudolf Felix Homberger Pressure responsive force transmission apparatus
US3978784A (en) * 1974-11-11 1976-09-07 Dominion Engineering Works, Limited Calendar control system
US5079998A (en) * 1991-02-01 1992-01-14 Westinghouse Electric Corp. Pneumatic driver
US5119681A (en) * 1990-02-15 1992-06-09 Fel-Pro Incorporated Test fixture
US5437191A (en) * 1993-04-10 1995-08-01 Zwick Gmbh & Co. Hydraulically powered test frame with spindle-actuated valve
US5505095A (en) * 1994-10-12 1996-04-09 Raymond; Louis Rising step-load test apparatus
US20150260623A1 (en) * 2014-03-14 2015-09-17 Citic Dicastal Co., Ltd. Apparatus for detecting spring stiffness

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1905585A (en) * 1930-03-19 1933-04-25 Fulton Sylphon Co Steam engine
CH318481A (de) * 1953-12-10 1957-01-15 Amsler Alfred J & Co Hydraulische Werkstoffprüfmaschine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1905585A (en) * 1930-03-19 1933-04-25 Fulton Sylphon Co Steam engine
CH318481A (de) * 1953-12-10 1957-01-15 Amsler Alfred J & Co Hydraulische Werkstoffprüfmaschine

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731595A (en) * 1971-12-01 1973-05-08 Borg Warner Cylindrical bellows seal for extensive axial movement
US3975989A (en) * 1973-04-19 1976-08-24 Rudolf Felix Homberger Pressure responsive force transmission apparatus
US3978784A (en) * 1974-11-11 1976-09-07 Dominion Engineering Works, Limited Calendar control system
US5119681A (en) * 1990-02-15 1992-06-09 Fel-Pro Incorporated Test fixture
US5079998A (en) * 1991-02-01 1992-01-14 Westinghouse Electric Corp. Pneumatic driver
US5437191A (en) * 1993-04-10 1995-08-01 Zwick Gmbh & Co. Hydraulically powered test frame with spindle-actuated valve
US5505095A (en) * 1994-10-12 1996-04-09 Raymond; Louis Rising step-load test apparatus
US5585570A (en) * 1994-10-12 1996-12-17 Lra Laboratories, Inc. Rising step-load test apparatus
US20150260623A1 (en) * 2014-03-14 2015-09-17 Citic Dicastal Co., Ltd. Apparatus for detecting spring stiffness
US9470613B2 (en) * 2014-03-14 2016-10-18 Citic Dicastal Co. Ltd Apparatus for detecting spring stiffness

Also Published As

Publication number Publication date
DE2016509C3 (de) 1975-03-27
DE2016509B2 (de) 1974-08-01
DE2016509A1 (de) 1970-10-15
BE748671A (fr) 1970-09-06

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