United States Patent (19)
`Lara et al.
`
`(54) LCD MULTI-AXIS FLOATING MOUNT
`75 Inventors: Manuel Lara, Mark Woytassek, both
`of Cedar Rapids, Iowa
`73 Assignee: Rockwell International Corp., Seal
`Beach, Calif.
`
`(21) Appl. No.: 347,775
`22 Filed:
`Nov. 30, 1994
`... GO2F A1333
`(51. Int. Cl. ...
`... 349/58; 361/681
`52 U.S. Cl. ............
`58 Field of Search ............................... 359/83; 361/681;
`348/836
`
`e a vs.
`
`56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`4,545,647 10/1985 Sasaki et al. ............................. 359/83
`5,038,142
`8/1991 Flowers et al. ........................... 34A34
`5,202,768 4/1993 Oboza et al. ....
`... 358/247
`5,270,847 12/1993 Sano ................
`... 359/83
`5,363,227 11/1994 Ichikawa et al. ......................... 359/83
`FOREIGN PATENT DOCUMENTS
`61-130944 6/1986 Japan.
`
`
`
`III IIII
`USOO5594574A
`11
`Patent Number:
`5,594,574
`45 Date of Patent:
`Jan. 14, 1997
`
`Primary Examiner-William L. Sikes
`Assistant Examiner-Charles Miller
`Attorney, Agent, or Firm-Gregory G. Williams; M. Lee
`Murrah; G. A. Montanye
`
`ABSTRACT
`57
`Newton rings on a liquid crystal display (LCD) are avoided
`by connecting the frame of the LCD to the chassis without
`deflecting the frame outward toward the chassis. A first
`connecting mechanism coupled to the frame and to the
`chassis at least partially secures the frame to the chassis by
`prohibiting movement of the frame relative to the chassis in
`a first direction, but allows at least partial movement of the
`frame relative to the chassis in a second direction non
`parallel to the first direction. A second connecting mecha
`nism coupled to the frame and to the chassis at least partially
`secures the frame to the chassis by prohibiting movement of
`the frame relative to the chassis in the second direction, but
`allows at least partial movement of the frame relative to the
`chassis in the first direction. In combination, the coupling
`mechanisms prohibit movement of the frame relative to the
`chassis in both the first and second directions.
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`20 Claims, 4 Drawing Sheets
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`PRIOR ART
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`PRIOR ART
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`Jan. 14, 1997
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`1.
`LCD MULTI-AXS FLOATING MOUNT
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`BACKGROUND OF THE INVENTION
`The present invention relates to displays, and more par
`ticularly to an improved mount for securing a liquid crystal
`display frame to a chassis.
`Liquid crystal displays (LCDs) operate by reducing the
`transmissibility of light through a thin layer of liquid crys
`talline material (hereinafter referred to as the "liquid crys
`tal') when an electric field is applied. Since the reduced
`transmissibility effect is localized, shapes and characters can
`be drawn on an LCD by carefully controlling the application
`of the electric field. The liquid crystal of an LCD is sensitive
`to external forces and stresses which can degrade its visual
`output. Deflection of the liquid crystal caused by the appli
`cation of external forces may result in a phenomenon known
`as "Newton rings'. Newton rings may be multi-colored or
`rainbow type distortion visible on the LCD when such a
`deflection of the liquid crystal occurs. The existence of
`Newton rings is undesirable, and in many cases unaccept
`able.
`Typically, the liquid crystal of an LCD is secured to an
`LCD frame. The LCD frame supports the liquid crystal and
`other components such as light filters and protective win
`dows. The LCD frame is adapted to be received into and
`supported by a chassis. To satisfy manufacturing tolerance
`requirements and to facilitate ease of assembly, a designed
`gap or clearance exists between the chassis and the frame
`when the frame is inserted into the chassis. In most appli
`cations, such as use of the LCD in an aircraft cockpit,
`existence of this gap allows unacceptable movement and
`shifting of the liquid crystal and frame. Therefore, the LCD
`frame must be secured to the chassis.
`35
`Typically, the LCD frame is rigidly secured to the chassis
`with mounting hardware, such as screws or nuts and bolts,
`positioned around the LCD at various locations. As the
`hardware is tightened, the LCD frame deflects outward
`toward the chassis to eliminate the gap between the two
`components. As the LCD frame deflects outward, the
`stresses are transferred to the liquid crystal and Newton
`rings result.
`Consequently, a need exists for an improved LCD in
`which the frame can be secured to the chassis without
`causing Newton rings to develop.
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`SUMMARY OF THE INVENTION
`It is an object of the present invention to provide an LCD
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`without Newton rings on the liquid crystal. It is a further
`object of the invention to provide a method and apparatus for
`securing a display frame to a chassis without causing
`deflection of the frame toward the chassis.
`A feature of the present invention is that the disclosed
`LCD has a frame securely mounted to a chassis without
`causing Newton rings. More specifically, the LCD includes
`aliquid crystal connected to and supported by the frame. The
`chassis is adapted for receiving the frame, and thereby
`supports the frame and the liquid crystal. A first connecting
`mechanism is coupled to the frame and to the chassis to at
`least partially secure the frame to the chassis by prohibiting
`movement of the frame relative to the chassis in a first
`direction. However, the first connecting mechanism allows
`at least partial movement of the frame relative to the chassis
`in a second direction non-parallel to the first direction. By
`allowing at least partial movement of the frame relative to
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`the chassis in the second direction, the first connecting
`mechanism prevents the frame from deflecting outward
`toward the chassis in the second direction as a result of the
`first connecting mechanism being coupled between the
`frame and the chassis.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`The invention may be more fully understood by reading
`the following description of a preferred embodiment of the
`invention in conjunction with the appended drawings
`wherein:
`FIG. 1 is a front perspective view of a prior art LCD;
`FIG. 2 is a rear perspective view of the prior art LCD
`shown in FIG. 1, utilizing previously existing methods of
`rigidly mounting the LCD frame to the chassis;
`FIG. 3 is a partial view in perspective and with portions
`exploded of an LCD frame and mount in accordance with
`preferred embodiments of the present invention;
`FIG. 4 is a perspective view of a chassis adapted for use
`with the frame and mount shown in FIG. 3;
`FIG. 5 is a perspective view with portions exploded of the
`LCD and mount of the present invention; and
`FIG. 6 is a rear view, with portions shown in section, of
`the LCD and mount of the present invention.
`DESCRIPTION OF THE PREFERRED
`EMBODIMENT
`FIGS. 1 and 2 are front and rear perspective views of prior
`art LCD assembly 100. Prior art LCD assembly 100 includes
`liquid crystal 102, frame 104, chassis 106, screws 108, holes
`or apertures 110 in chassis 106, and holes or apertures 112
`in frame 104.
`Liquid crystal 102 is connected to and supported by frame
`104. Frame 104 is, in turn, adapted to be inserted into and
`supported by chassis 106. As such, frame 104 must be
`sufficiently smaller in dimension than chassis 106 to accom
`modate necessary design tolerances and to facilitate ease of
`assembly.
`Screws 108 extend through holes 110 in chassis 106 and
`holes 112 in frame 104 to secure frame 104 to chassis 106.
`While mounting frame 104 and liquid crystal 102 to chassis
`106, screws 108 are tightened, deflecting frame 104 outward
`toward chassis 106. This deflection of frame 104 results in
`forces being transferred to liquid crystal 102, which in turn
`causes deflection of liquid crystal 102. The stresses on liquid
`crystal 102 cause the undesirable occurrence of Newton
`rings on the display.
`FIG. 3 illustrates frame 300 in accordance with preferred
`embodiments of the present invention. Frame 300 is adapted
`for use with a floating mount which connects frame 300 to
`a chassis while eliminating or greatly reducing the likeli
`hood that Newton rings will appear on the liquid crystal. In
`preferred embodiments, frame 300 includes four fastener
`receiving voids or apertures 302 and four pin receiving holes
`or apertures 304. Fastener receiving voids 302 preferably
`create passageways through frame 300. Each of pin receiv
`ing holes 304 extends into frame 300 in a direction non
`parallel to a corresponding one of voids 302 such that each
`hole 304 at least partially intersects the corresponding void
`302.
`Included with frame 300 are four fasteners 306. Fasteners
`306 are adapted to be received in each of voids 302. Each
`fastener 306 includes a threaded member receiving hole or
`aperture 308 extending at least partially therethrough and a
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`pin receiving void or groove 310. As will be discussed later
`in greater detail, holes 308 are preferably positioned off
`center in fasteners 306 to create a cam mechanism.
`When properly aligned in one of fastener receiving voids
`302, groove 310 of a particular fastener is aligned with the
`corresponding one of pin receiving holes 304. One of pins
`312 is inserted into each of the aligned pairs of holes 304 and
`grooves 310 to movably secure fasteners 306 in voids 302
`and to at least partially prohibit rotation of fasteners 306 in
`voids 302. The dimensions of grooves 310 are sufficiently
`larger than those of pins 312 so that fasteners 306 can move
`to some degree inward and outward in voids 302.
`FIG. 4 illustrates chassis 400 in accordance with preferred
`embodiments of the present invention. Chassis 400 is
`adapted for receiving and supporting frame 300. As such, the
`dimensions of chassis 400 are larger than those of frame 300
`to provide the clearance necessary to insert frame 300 into
`chassis 400. Chassis 400 includes threaded member receiv
`ing apertures or openings 402. Openings 402 are spaced
`apart on chassis 400 such that, when frame 300 is inserted
`into chassis 400, openings 402 will be aligned with threaded
`member receiving holes 308 in each of fasteners 306.
`FIG. 5 is a perspective view of LCD assembly 500 with
`portions exploded to illustrate the improved mount of the
`present invention. As described above, prior to insertion of
`frame 300 into chassis 400, each of fasteners 306 is inserted
`into one of fastener receiving voids 302. Then, one of pins
`312 is inserted into each of pin receiving holes 304 to
`movably couple fasteners 306 to frame 300.
`After each fastener 306 is movably secured in one of
`fastener receiving voids 302, frame 300 is inserted into
`chassis 400. At this point, each of holes 308 in fasteners 306
`is aligned with one of openings 402 in chassis 400. Each of
`threaded members 502 is inserted through one of corre
`sponding openings 402 in chassis 400 and through the
`aligned one of holes 308. Threaded members 502 can be
`screws, bolts or other types of threaded members capable of
`securing fasteners 306 to chassis 400.
`As each of threaded members 502 is rotated for further
`insertion into the corresponding holes 308, the threads of
`threaded members 502 exert forces on the threads of holes
`308, forcing fasteners 306 toward chassis 400. Due to the
`off-centered location of holes 308 in fasteners 306, a cam
`effect is created as threaded members 502 are rotated. The
`movement of fasteners 306 allowed by pins 312 in grooves
`310 prevents frame 300 from deflecting.
`When each of fasteners 306 comes into contact with
`chassis 400, the cam mechanism configuration created by
`threaded members 502 and fasteners 306 causes each fas
`tener 306 to rotate until stopped by inner surfaces of frame
`300 exposed to voids 302. When aparticular fastener is fully
`tightened against the surface of chassis 400 and against an
`inner surface of void 302, movement of frame 300 at that
`location is at least partially inhibited in some directions.
`However, movement is allowed in a direction or directions
`parallel to the direction that the particular fastener 306 is
`inserted into the corresponding void 302. In other words,
`each fastener individually secures frame 300 to a particular
`portion of chassis 400 while allowing frame 300 and chassis
`400 to move slightly torward and away from each other in
`at least one direction. This prevents the transfer of forces to
`the frame as the threaded members are tightened. Thus, each
`fastener partially secures frame 300 to chassis 400 without
`deflecting frame 300 toward chassis 400 due to the clearance
`between the chassis and the frame.
`FIG. 6 is a rear view, with portions shown in section, of
`LCD assembly 500, illustrating the directions of movement
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`prohibited and allowed by each of a plurality of securing
`mechanisms. As shown, frame 300 is secured to chassis 400
`by securing mechanisms 602, 604, 606 and 608. As dis
`cussed with reference to FIGS. 3-5 above, each of mecha
`nisms 602, 604, 606 and 608 includes one fastener receiving
`void 302 in frame 300, one pin receiving hole 304 in frame
`300, one fastener 306, one pin 312, one threaded member
`receiving opening 402 in chassis 400, and one threaded
`member 502.
`When fully tightened, each pair of oppositely positioned
`securing mechanisms prohibits movement of frame 300
`relative to chassis 400 in a first direction or directions, while
`allowing movement of frame 300 relative to chassis 400 in
`a second direction or directions. For instance, securing
`mechanisms 602 and 606 allow movement of frame 300
`relative to chassis 400 in directions indicated by arrows 610
`and 612. Allowing movement in these directions prevents
`deflection of frame 300 toward chassis 400 at the positions
`of securing mechanisms 602 and 606. However, securing
`mechanisms 602 and 606 prohibit movement of frame 300
`relative to chassis 400 in other directions, specifically in
`directions with directional components represented by
`arrows 614 and 616.
`Similarly, securing mechanisms 604 and 608 allow move
`ment of frame 300 relative to chassis 400 in directions
`represented by arrows 614 and 616, but prohibit movement
`of frame 300 in other directions, particularly directions
`represented by arrows 610 and 612. In this way, frame 300
`will be partially prohibited from movement at these loca
`tions, but will not deflect toward chassis 400. Therefore, the
`combination of the first pair of securing mechanisms 602
`and 606 and the second pair of securing mechanism 604 and
`608 substantially prohibit movement of frame 300 relative to
`chassis 400 in any direction with a directional component
`represented by arrows 610, 612, 614 or 616.
`It is believed that the cam effect of the fully secured
`fasteners against chassis 400 inhibits movement of frame
`300 relative to chassis 400 in directions perpendicular to all
`of arrows 610, 612, 614 and 616 (directions into and out of
`the plane of the page). Therefore, movement of frame 300
`relative to chassis 400 can be completely or substantially
`eliminated in all directions without deflecting frame 300
`outward toward chassis 400. Consequently, stresses will not
`be transferred to the liquid crystal and Newton rings will not
`OCCU.
`An additional advantageous feature derived from the
`floating mount configuration of the present invention is the
`self centering of the LCD frame within the chassis. The
`center points of the frame and chassis, as determined by the
`intersection of lines drawn between opposite pairs of mount
`ing holes, will coincide. The floating mount fastener sur
`faces move outward to align with the mounting holes of the
`chassis. Therefore, since the LCD frame and chassis mount
`ing surfaces are shared, the center of the LCD frame and
`chassis will be the same.
`While particular embodiments of the present invention
`have been shown and described, it should be clear that
`changes and modifications may be made to such embodi
`ments without departing from the true scope and spirit of the
`invention. For instance, more or less than four total securing
`mechanisms can be used. Also, the particular configuration
`of the securing mechanisms can be altered to achieve the
`same result. It is intended that the appended claims cover all
`such changes and modifications.
`We claim:
`1. A liquid crystal display mount comprising:
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`a frame having a first fastener receiving void and a first
`pin receiving aperture, the first pin receiving aperture at
`least partially intersecting the first fastener receiving
`void;
`a first fastener having a first threaded member receiving
`hole and having a first pin receiving void, the first
`fastener being positionable in the first fastener receiv
`ing void such that the first pin receiving aperture is
`aligned with the first pin receiving void;
`a first pin extending through the first pin receiving aper
`ture and into the first pin receiving void to movably
`couple the first fastener to the frame and to inhibit
`complete rotation of the first fastener in the first fas
`tener receiving void;
`a chassis having a first threaded member receiving open
`ing alignable with the first threaded member receiving
`hole when the first fastener is positioned in the first
`fastener receiving void of the frame; and
`a first threaded member insertable through the first
`threaded member receiving opening and into the first
`threaded member receiving hole such that a distance
`between the first fastener and the chassis is reduced,
`thereby at least partially securing the frame to the
`chassis.
`2. The liquid crystal display mount of claim 1 wherein the
`distance between the first fastener and the chassis is reduced
`to the extent that the first fastener is in contact with the
`chassis, thereby inhibiting movement of the frame relative to
`the chassis in a first direction but allowing movement of the
`frame relative to the chassis in a second direction non
`parallel to the first direction.
`3. The liquid crystal display mount of claim 2 wherein the
`first fastener receiving void and the first fastener are sub
`stantially circular in shape.
`4. The liquid crystal display mount of claim 2 wherein the
`first threaded member receiving hole is positioned off-center
`in the first fastener such that the first fastener acts as a cam
`and the first threaded member acts as a camshaft, rotation of
`the first threaded member causing the first fastener to rotate
`non-eliptically until further rotation is inhibited by at least
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`one of the frame and the first pin, thereby inhibiting move
`ment of the frame relative to the chassis in the first direction.
`5. The liquid crystal display mount of claim 2 wherein the
`second direction is perpendicular to the first direction.
`6. A liquid crystal display assembly comprising:
`a liquid crystal;
`a frame coupled to the liquid crystal, the frame having
`first and second fastener receiving apertures and first
`and second pin receiving holes, the first pin receiving
`hole at least partially intersecting the first fastener
`receiving aperture, and the second pin receiving hole at
`least partially intersecting the second fastener receiving
`aperture,
`a first fastener having a first threaded member receiving
`hole and a first pin receiving void, the first fastener
`being positionable in the first fastener receiving aper
`ture such that the first pin receiving void is aligned with
`the first pin receiving hole;
`a second fastener having a second threaded member
`receiving hole and second pin receiving void, the
`second fastener being positionable in the second fas
`tener receiving aperture such that the second pin receiv
`ing void is aligned with the second pin receiving hole;
`a first pin insertable in the first pin receiving hole and in
`the first pin receiving void to couple the first fastener to
`the frame and to prohibit complete rotation of the first
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`fastener while the first fastener is positioned in the first
`fastener receiving aperture;
`a second pin insertable in the second pin receiving hole
`and in the second pin receiving void to couple the
`second fastener to the frame and to prohibit complete
`rotation of the second fastener while the second fas
`tener is positioned in the second fastener receiving
`aperture,
`a chassis adapted for receiving the frame, the chassis
`having first and second threaded member receiving
`apertures, the first threaded member receiving aperture
`being alignable with the first threaded member receiv
`ing hole, and the second threaded member receiving
`aperture being alignable with the second threaded
`member receiving hole;
`a first threaded member insertable in the first threaded
`member receiving aperture and in the first threaded
`member receiving hole for securing the first fastener to
`the chassis and thereby at least partially securing the
`frame to the chassis; and
`a second threaded member insertable in the second
`threaded member receiving aperture and in the second
`threaded member receiving hole for securing the sec
`ond fastener to the chassis and thereby at least partially
`securing the frame to the chassis.
`7. The liquid crystal display assembly of claim 6 wherein
`securing the first and second fasteners to the chassis inhibits
`movement of the frame relative to the chassis in a first
`direction but allows at least partial movement of the frame
`relative to the chassis in a second direction.
`8. The liquid crystal display assembly of claim 7 wherein
`the first and second fastener receiving apertures are disposed
`in opposing positions on the frame from one another.
`9. The liquid crystal display assembly of claim 6 wherein
`securing the first fastener to the chassis inhibits movement
`of the frame relative to the chassis in a first direction, but
`allows at least partial movement of the frame relative to the
`chassis in a second direction, and wherein securing the
`second fastener to the chassis inhibits movement of the
`frame relative to the chassis in the second direction, but
`allows movement of the frame relative to the chassis in the
`first direction.
`10. The liquid crystal display assembly of claim 6,
`wherein the frame further includes third and fourth fastener
`receiving apertures, a third pin receiving hole which at least
`partially intersects the third fastener receiving aperture and
`a fourth pin receiving hole which at least partially intersects
`the fourth fastener receiving aperture, and wherein the
`chassis further includes third and fourth threaded member
`receiving apertures, the liquid crystal display assembly
`further comprising:
`a third fastener having a third threaded member receiving
`hole and a third pin receiving void, the third fastener
`being positionable in the third fastener receiving aper
`ture such that the third pin receiving void is aligned
`with the third pin receiving hole;
`a fourth fastener having a fourth threaded member receiv
`ing hole and a fourth pin receiving void, the fourth
`fastener being positionable in the fourth fastener
`receiving aperture such that the fourth pin receiving
`void is aligned with the fourth pin receiving hole;
`a third pin insertable in the third pin receiving hole and in
`the third pin receiving void to couple the third fastener
`to the frame and to prohibit complete rotation of the
`third fastener while the third fastener is positioned in
`the third fastener receiving aperture;
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`a fourth pin insertable in the fourth pin receiving hole and
`in the fourth pin receiving void to couple the fourth
`fastener to the frame and to prohibit complete rotation
`of the fourth fastener while the fourth fastener is
`positioned in the fourth fastener receiving aperture,
`a third threaded member insertable in the third threaded
`member receiving aperture and in the third threaded
`member receiving hole for securing the third fastener to
`the chassis and thereby at least partially securing the
`frame to the chassis; and
`a fourth threaded member insertable in the fourth threaded
`member receiving aperture and in the fourth threaded
`member receiving hole for securing the fourth fastener
`to the chassis and thereby at least partially securing the
`frame to the chassis.
`11. The liquid crystal display assembly of claim 10
`wherein securing the first and second fasteners to the chassis
`inhibits movement of the frame relative to the chassis in a
`first direction, but allows movement of the frame relative to
`the chassis in a second direction non-parallel to the first
`direction, and wherein securing the third and fourth fasteners
`to the chassis inhibits movement of the frame relative to the
`chassis in the second direction, but allows movement of the
`frame relative to the chassis in the first direction, such that
`securing the first, second, third and fourth fasteners to the
`frame prohibits movement of the frame relative to the
`chassis in both of the first and second directions.
`12. A display comprising:
`a frame;
`a chassis adapted for receiving the frame;
`first and second connecting mechanisms coupled to the
`frame and to the chassis for at least partially securing
`the frame to the chassis by prohibiting movement of the
`frame to the chassis in a first direction, the first and
`second connecting mechanisms allowing at least partial
`movement of the frame relative to the chassis in a
`second direction non-parallel to the first direction; and,
`the first and second connecting mechanisms allow at least
`partial movement of the frame relative to the chassis in
`the second direction so that the frame does not deflect
`outward toward the chassis in the second direction.
`13. The display of claim 12 wherein the first direction is
`substantially perpendicular to the second direction.
`14. The display of claim 2 and further comprising:
`third and fourth connecting mechanisms coupled to the
`frame and to the chassis for at least partially securing
`the frame to the chassis by prohibiting movement of the
`frame relative to the chassis in the second direction, the
`third and fourth connecting mechanisms allowing at
`least partial movement of the frame relative to the
`chassis in the first direction.
`15. The display of claim 14 wherein the third and fourth
`connecting mechanisms allow at least partial movement of
`the frame relative to the chassis in the first direction so that
`the frame does not deflect outward toward the chassis in the
`first direction, the first and second connecting mechanisms
`and the third and fourth connecting mechanisms together
`prohibiting movement of the frame relative to the chassis in
`both of the first and second directions.
`16. The display of claim 15 wherein the first and second
`connecting mechanisms are positioned opposite one another
`on the display and wherein the third and fourth connecting
`mechanisms are positioned opposite one another on the
`display.
`17. A liquid crystal display assembly comprising:
`a liquid crystal;
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`a frame coupled to the liquid crystal, the frame having
`first, second, third and fourth fastener receiving aper
`tures and having first, second, third and fourth pin
`receiving holes, the first pin receiving hole at least
`partially intersecting the first fastener receiving aper
`ture, the second pin receiving hole at least partially
`intersecting the second fastener receiving aperture, the
`third pin receiving hole at least partially intersecting the
`third fastener receiving aperture, and the fourth pin
`receiving hole at least partially intersecting the fourth
`fastener receiving aperture,
`a first fastener having a first threaded member receiving
`hole and a first pin receiving void, the first fastener
`being positionable in the first fastener receiving aper
`ture such that the first pin receiving void is aligned with
`the first pin receiving hole;
`a second fastener having a second threaded member
`receiving hole and a second pin receiving void, the
`second fastener being positionable in the second fas
`tener receiving aperture such that the second pin receiv
`ing void is aligned with the second pin receiving hole;
`a third fastener having a third threaded member receiving
`hole and a third pin receiving void, the third fastener
`being positionable in the third fastener receiving aper
`ture such that the third pin receiving void is aligned
`with the third pin receiving hole;
`a fourth fastener having a fourth threaded member receiv
`ing hole and a fourth pin receiving void, the fourth
`fastener being positionable in the fourth fastener
`receiving aperture such that the fourth pin receiving
`void is aligned with the fourth pin receiving hole;
`a first pin insertable in the first pin receiving hole and in
`the first pin receiving void to couple the first fastener to
`the frame and to prohibit complete rotation of the first
`fastener while the first fastener is positioned in the first
`fastener receiving aperture,
`a second pin insertable in the second pin receiving hole
`and in the second pin receiving void to couple the
`second fastener to the frame and to prohibit complete
`rotation of the second fastener while the second fas
`tener is positioned in the second fastener receiving
`aperture;
`a third pin insertable in the third pin receiving hole and in
`the third pin receiving void to couple the third fastener
`to the frame and to prohibit complete rotation of the
`third fastener while the third fastener is positioned in
`the third fastener receiving aperture;
`a fourth pin insertable in the fourth pin receiving hole and
`in the fourth pin receiving void to couple the fourth
`fastener to the frame and to prohibit complete rotation
`of the fourth fastener while the fourth fastener is
`positioned in the fourth fastener receiving aperture;
`a chassis adapted for receiving the frame, the chassis
`having first, second, third and fourth threaded member
`receiving apertures, the first threaded member receiv
`ing aperture being alignable with the first threaded
`member receiving hole, the second threaded member
`receiving aperture being alignable with the second
`threaded member receiving hole, the third threaded
`member receiving aperture being alignable with the
`third threaded member receiving hole, and the fourth
`threaded member receiving aperture being alignable
`with the fourth threaded member receiving hole;
`a first threaded member insertable in the first threaded
`member receiving aperture and in the first threaded
`
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`5,594,574
`
`member receiving hole for securing the first fastener to
`the chassis and thereby at least partially securing the
`frame to the chassis,
`Second threaded member insertable in the second
`threaded member receiving aperture and in the second
`threaded member receiving hole for securing the sec
`ond fastener to the chassis and thereby at least partially
`Securing the frame to the chassis;
`a third threaded member insertable in the third threaded
`member receiving aperture and in the third threaded
`member receiving hole for securing the third fastener to
`the chassis and thereby at least partially securing the
`frame to the chassis; and
`a fourth threaded member insertable in the fourth threaded
`member receiving aperture and in the fourth threaded
`member receiving hole for securing the fourth fastener
`to the chassis and thereby at least partially securing the
`frame to the chassis, wherein securing the first and
`second fasteners to the chassis inhibits movement of
`the frame relative to the chassis in a first direction, but
`allows movement of the frame relative to the chassis in
`a second direction non-parallel to the first direction,
`and wherein securing the third and fourth fasteners to
`the chassis inhibits movement of the frame relative to
`the chassis in the second direction, but allows move
`ment of the frame relative to the chassis in the first
`direction, such that securing the first, second, third a