Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
  • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
  • B23Q1/25—Movable or adjustable work or tool supports
  • B23Q1/26—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members
  • B23Q1/34—Relative movement obtained by use of deformable elements, e.g. piezoelectric, magnetostrictive, elastic or thermally-dilatable elements
  • B23Q1/36—Springs
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
  • G01M7/00—Vibration-testing of structures; Shock-testing of structures
  • G01M7/02—Vibration-testing by means of a shake table
  • G01M7/04—Monodirectional test stands
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T403/00—Joints and connections
  • Y10T403/45—Flexibly connected rigid members
  • Y10T403/453—Flexible sleeve-type coupling

Definitions

• This invention has to do with vibration apparatus such as is used in the screening or testing of assembled devices and components thereof, particularly mechanical, electromechanical and electronic devices and components for defects in design or manufacturing. More particularly, the invention is concerned with improvements in vibration apparatus used for screening or testing enabling vibratory shaking of a slip plate without pivoting movement about the shaker axis of engagement with its support block.
• the flexure means has a locus of engagement with the slip plate in the plane of slip plate sliding engagement with the support block; the flexure means surrounds the slip plate support block at its locus of engagement with the slip plate; the flexure
• OMPI locus of engagement with the slip plate is circular; the flexure means is circular in cross-section and axially elongated, the flexure means being fixed to a relatively immovable mass at one end and secured to the slip plate remote to the fixed end, whereby the flexure means bends longitudinally in slip plate predetermined axial movement permitting relation, the flexure means further being torsionally stiff in pivoting slip plate movement blocking relation.
• the flexure means comprises a longitudinally bendable, torsionally stiff cylinder of synthetic organic plastic, is a hollow cylinder, and the apparatus further includes circularly distributed means connecting the cylinder at one end to the slip plate.
• the foregoing and other embodiments of the invention may further include a vibration shaker and a slip plate.
• the invention contemplates in vibration apparatus in which a shaker is coupled to a test piece-carrying, single plane universally movable, rigid slip plate and drives the slip plate in axially predetermined sliding engagement with a slip plate support block, the provision of a cylindrical flexure blocking pivoting movement of the slip plate about its center axis normal to that plane, in slip plate predetermined axial movement permitting relation.
• the mentioned cylindrical flexure typically has a circular locus of engagement with the slip plate in the plane of slip plate sliding engagement with the support block, and surrounds the support block at its locus of engagement with the slip plate.
• the cylindrical flexure is of uniform diameter along its axial length and fixed at one end to a relatively immovable mass and secured at its opposite end to the slip plate, the flexure being hollow and having a wall thickness adapted to bend longitudinally in slip plate predetermined axial movement permitting relation, the flexure means further being torsionally stiff in pivoting slip plate movement blocking relation.
• the flexure means comprises a longitudinally bendable, torsionally stiff cylinder of synthetic organic plastic.
• the flexure is typically combined with a vibration apparatus comprising a vibration shaker and a slip plate.
• the invention provides, vibration apparatus comprising a vibration shaker, a slip plate adapted to be driven in predetermined axial vibratory movement by the shaker, a slip plate support block having sliding engagement with the slip plate, a cylindrical flexure longitudinally bendable but torsionally stiff and fastened at one end to a relatively immovable mass and clamped at the opposite end to an inwardly disposed flange ring carried by the slip plate by a clamp acting circularly of the flexure end to block slip plate pivoting movement about its axis of engagement with the support block, the flexure surrounding the support block.
• the invention further provides, method for effecting vibration testing of a test piece carried on a rigid slip plate, which includes vibrating the slip plate in a predetermined axial direction while constraining the slip plate for linear movement only by securement to a longitudinally bendable, torsionally stiff flexure.
• Fig. 1 is a side elevation view of vibration apparatus according to the invention
• Fig. 2 is a horizontal * sectional view thereof, taken on line 2-2 in Fig. 1: and,
• Fig. 3 is a fragmentary vertical sectional view, taken on line 3-3 in Fig. 1.
• vibration shaker 10 is an armature and field coil apparatus in a metal housing.
• a driver bar 12 carried on the shaker armature 14 is coupled to a rigid, horizontally disposed magnesium, or other suitable metal slip plate 16, on which a test piece (not shown) is carried for vibratory testing.
• Slip plate 16 coupling to the driver bar 12 is by a series of vertically disposed expansion bolts 18 which transmits the vibration of the shaker 10 armature and field coil arrangement to the slip
• the slip plate 16 is vertically supported on a granite slip plate support block 20 having a polished surface 22.
• the slip plate support block 20 is supported on steel supports 24 anchored in a concrete and steel mass 26.
• An oil film 28 is maintained atop support block surface 22 to facilitate sliding of the slip plate 16 in engagement with the surface.
• oil film bearing tables have in the past subjected their surroundings to oil contamination, but with the present flexure apparatus, the oil is completely contained within the apparatus.
• the apparatus as thusfar described has a slip plate 16 driven by shaker 10 relative to support block 20. Vibration is preferably linear along a predetermined axis, in the drawings lef -to-right and back, as determined by the axis of movement of the armature 14 in shaker 10. In the normal course of operation, however, the slip plate 16 may tend to deviate from a straight line and to describe skewed movements, and also to pivot partially with respect to the center vertical axis A-A of the slip plate 16 engaged with the support block 20. Such movements are detrimental to effective testing and evaluation of components and assemblies.
• the flexure 30 is a hollow cylinder diametrically dimensioned to surround the support block 20 and of an axial length to extend from a circular locus of engagement 32 with the underside of the
• the flexure 30 is circular in cross-section to be resistant to torsional force. That is, the flexure 30 is a cylinder and has a wall thickness sufficient, given the material of construction, to be stiff in torsion, but yet, not so thick in the wall as to resist unduly longitudinal bending, i.e. bending on the axis A-A.
• Solid synthetic organic plastic walls e.g. of polyolefin, polyamide, polyester, or the like, preferably having a very high tensile strength, e.g. 35,000 psi. and above, and high flexural strength and toughness to resist fatigue failure, are suitable.
• the flexure 30 wall may be corrugated, as in a bellows, to ease flexing stress.
• the flexure 30 is connected to the slip plate 16 by fitting the upper end of the flexure over a flanged ring 34 which is secured to the slip plate by fasteners not shown.
• a clamp 36 of the hose-clamp type is tightened over the top edge margin 30a of the flexure 30 by bolt 38 through ears 36a until the flexure is snugly against the flanged ring 34, as shown.
• the flexure lower edge margin 30b is secured to a second flanged ring 40 by clamp 42 and bolt 44 through ears 42a, as shown.
• the support block 20, and its oil film 28 are fully enclosed against oil contamination in the areas beyond the apparatus.
• the slip plate 16 is driven essentially on a single axis in plane P-P, the axis of driving being predetermined by the alignment of the armature 14.
• the flexure 30 which because of its ability to bend longitudinally has accommodated the linear movement of the slip plate and thus permitted driving in the predetermined axis, is twisted on its own longitudinal axis, in torsion. But because the cylinder is uniform and circular in cross-section, and trapped between slip plate 16 and mass 26, as described, only twisting will allow pivoting movement of the slip plate, but the cylindrical flexure is torsionally stiff. The result is that the pivoting moment imparted to the slip plate 16 is substantially converted to linear movement of the slip plate. Pivoting movement is blocked, linear movement permitted in a simple reliable manner, meeting the foregoing objectives of the-invention.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
• Apparatuses For Generation Of Mechanical Vibrations (AREA)
• Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
• Chair Legs, Seat Parts, And Backrests (AREA)
• Bridges Or Land Bridges (AREA)
• Percussion Or Vibration Massage (AREA)
• Buildings Adapted To Withstand Abnormal External Influences (AREA)
• Reciprocating, Oscillating Or Vibrating Motors (AREA)

Priority Applications (7)

Applications Claiming Priority (1)

Publications (1)

Family

ID=22167875

Family Applications (1)

Country Status (7)

Families Citing this family (11)

Citations (5)

Family Cites Families (4)

• 1982
  • 1982-03-23 US US06/422,972 patent/US4440026A/en not_active Expired - Lifetime
  • 1982-03-23 AU AU83988/82A patent/AU8398882A/en not_active Abandoned
  • 1982-03-23 JP JP57501483A patent/JPS59500384A/ja active Granted
  • 1982-03-23 AT AT82901451T patent/ATE30524T1/de not_active IP Right Cessation
  • 1982-03-23 DE DE8282901451T patent/DE3277570D1/de not_active Expired
  • 1982-03-23 EP EP82901451A patent/EP0105253B1/en not_active Expired
  • 1982-03-23 WO PCT/US1982/000349 patent/WO1983003370A1/en not_active Ceased

Patent Citations (5)

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