US3831064A - Locking bar arrangement for securing electronic assemblies - Google Patents

Locking bar arrangement for securing electronic assemblies Download PDF

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Publication number
US3831064A
US3831064A US00343956A US34395673A US3831064A US 3831064 A US3831064 A US 3831064A US 00343956 A US00343956 A US 00343956A US 34395673 A US34395673 A US 34395673A US 3831064 A US3831064 A US 3831064A
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United States
Prior art keywords
locking bar
mounting frame
assemblies
ancillary
arrangement
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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
US00343956A
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English (en)
Inventor
R Keller
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Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
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Publication of US3831064A publication Critical patent/US3831064A/en
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/14—Mounting supporting structure in casing or on frame or rack
    • H05K7/1401—Mounting supporting structure in casing or on frame or rack comprising clamping or extracting means
    • H05K7/1402—Mounting supporting structure in casing or on frame or rack comprising clamping or extracting means for securing or extracting printed circuit boards
    • H05K7/1408—Mounting supporting structure in casing or on frame or rack comprising clamping or extracting means for securing or extracting printed circuit boards by a unique member which latches several boards, e.g. locking bars

Definitions

  • ABSTRACT A locking bar arrangement is disclosed for securing a plurality of electronic assemblies disposed in a mounting frame and arranged in a row one next to the other. The edges of the electronic assemblies are locked by means of elastic formed members in a vibration-proof manner.
  • each assembly is therefore not necessary and it is sufficient to fasten only a locking bar to a mounting frame.
  • the locking bar can be attached to the mounting frame so that it can be tilted to permit removal of the assemblies from the mounting frame without having to take the locking bar out completely. Designation markings can be applied on the locking bar and their correspondence to appropriate assemblies is maintained.
  • the invention relates to a locking bar arrangement for securing electronic assemblies which are lined up side-by-side in a mounting frame.
  • the locking bar of the arrangement covers one edge of each of the assemblies.
  • a known locking bar such as disclosed, for instance, in Deutsche Schwarzsrnuster 1,894,755
  • the correlation is preserved by the provision that the locking bar is attached at the mounting frame so that it can be tilted about an axis which is parallel to the axis of the bar.
  • this locking bar merely has to be hinged up or down to make the assemblies accessible. Markings which are applied to this bar are always readable and mark the mounting location of the assemblies unambiguously.
  • the fastening of the individual assemblies in the mounting frame cannot be dispensed with in this locking bar.
  • the known locking bar is furthermore held in its stable end positions only by spring force and this can lead to an unintentional displacement of the bar.
  • the locking bar arrangement of the invention secures a plurality of electronic assemblies disposed in a mounting frame and arranged in a row one next to the other.
  • the locking bar arrangement includes as a feature a locking bar mountable on the frame for securing the assemblies therein.
  • the locking bar has a surface directed toward the assemblies for covering over an edge of each of the assemblies when mounted for securing the same.
  • Fastening means are provided for removably bolting the locking bar to the mounting frame.
  • An elastic formed member is disposed at this surface of the locking bat and extends therealong for substantially the entire length of the locking bar.
  • the formed memher is arranged in elevation on this surface with respect to the respective edges of the assemblies covered by the locking bar so as to cause the formed member to have pressed portions conjointly surrounding the edges of the assemblies when the locking bar is bolted to the mounting frame.
  • Each of the electronic assemblies has two mutually adjacent sides defining an edge angle and conjointly forming the edge of the assembly covered over by the locking bar.
  • the formed member has a contour and a location on the surface of the locking bar facing the assemblies which are selected so as to cause the pressed portions thereof to apply a force to the edge of each assembly in a direction coincident with the bisector of the edge angle.
  • the elastic formed member can be a rope-like material which is pushed into a mounting of the locking bar and it may be of circular cross-section.
  • the locking bar with at least one projection, a portion of which fits tightly into a part of a recess in the mounting frame.
  • This projection serves for centering the locking bar in the mounting frame and, at the same time, it relieves the fastening screws because it serves as a support element when the assemblies are pressed into the elastic formed member.
  • This projection can be a longitudinal stiffening rib of the locking bar.
  • the aforementioned fastening means can include screws mounted on the locking bar and respective bore means formed in the mounting frame for accommodating the screws therein.
  • Each of the bore means has an innermost portion and an ancillary portion adjacent the innermost portion.
  • Winding means are at the ancillary portion for threadably engaging a corresponding one of the screws when the locking bar is bolted to the mounting frame and for facilitating the movement of the shank portion through the winding means when the screw is threadably disengaged from the same whereby the locking bar can be moved a distance away from the mounting frame and tilted about an axis parallel to the longitudinal axis of the locking bar.
  • the innermost portion is disposed in the mounting frame beyond the ancillary portion and is expanded to form a cavity.
  • the ancillary portion of each of the bore means can include at least one groove formed in the mounting frame and the winding means can be a nut threadably engaging the screw corresponding to the bore means. The groove has a width greater than the thickness of the nut.
  • markings can be arranged on the front of the locking bar which will therefore always remain readable and uniquely related to the mounting locations of the assemblies.
  • the locking bar attached in this manner can be hinged only after the fastening screws are loosened. Unintended tilting during operation, which can occur with the known locking bar, is therefore prevented.
  • securing assemblies with a locking bar which is hinge mounted is not limited only to a locking bar in which the assemblies are locked so as to be vibration-proof with the aid of an elastic formed member. The particular advantages of this type of securing arrangement remain if it is used in connection with a locking bar which does not afford an absolutely vibration-proof fastening of the assemblies.
  • the locking strip according to the invention makes possible the vibration-proof locking of assemblies in assembly carriers also for rugged operation. Moreover, the repair and exchange of assemblies are facilitated because the mounting location in the mounting frame remains unambiguously marked. It should further be pointed out that the locking bar can be made as a profiled rod by an extrusion process and no particular effort is required for mass production of the same. The longitudinal slot to receive the stiffening rail and the fastening screws can also be produced as an extrusion and fastened separately in the mounting frame.
  • FIGS. Embodiments of the locking arrangement for securing electronic assemblies according to the invention are illustrated in the FIGS. described below. Similar or like components are designated by the same reference numeral in each FIG. in which they appear.
  • FIG. 1 is a schematic diagram of an elevation front view of a mounting frame equipped with two locking bar arrangements according to the invention. One of the locking bars is shown at the top edge of the electronic assemblies mounted in the frame and the other locking bar is at the lower edge of the assemblies.
  • FIG. 2 is a section view taken along the line IIII of FIG. I at the region of the lower locking bar.
  • FIG. 3 is a section view taken along line III-III of FIG. 1 and shows a screw connection.
  • FIG. 3a is a section view also taken along line III-III showing the locking bar in the extended released position.
  • a mounting frame 1 is shown in which the front panels 2a to 2g of several electronic assemblies are lined up side-by-side.
  • the lower edges 3 and the upper edges 4 of each front panel 2 are covered by respective bars 6a and 6b which are each fastened in the mounting frame 1 by fastening means which can comprise two screws.
  • Bar 6a is fastened by screws 7a and 7b and bar 6b by screws 8a and 812.
  • FIG. 2 a cross-section is shown of the locking bar arrangement of the invention at the lower edge of the assemblies and includes locking bar 6a.
  • the locking bar 60 is provided with -a projection 9 which in the illustrated embodiment is a longitudinal stiffening rib.
  • a portion 9a of the longitudinal stiffening rib 9 fits essentially in a form-tight manner in a partial region 10a of a longitudinal slot 10.
  • the locking bar 6a is centered in the mounting frame by means of the portion 9a of the longitudinal rib 9. This portion 9a further takes up the counterforces generated when the locking bar is screw fastened and relieves load on the screws 7.
  • An elastic, rope-like formed member 12 of circular cross-section is pushed into holding means in the form of a groove 11 of the locking bar 6a.
  • the cross-section of the groove 11 corresponds to the sector of a circle.
  • the elastic insert 12 can be made of a foam material for example.
  • the rope-like material may also have a rectangular or triangular cross-section.
  • the mounting groove 11 for the rope-like molding 12 is arranged in the locking bar 6a at the height of the front panel 2 of the electronic assembly. For the bolted condition, shown in FIG. 2, the lower edge 3 of the front panel 2 is pressed into the elastic rope l2 and is surrounded by the compressed parts of this rope. This results in a force which is essentially in the direction of the bisector of the angle defined by the edge 3. The direction of this force which corresponds to the bisector of the angle is indicated in FIG. 2 by the arrow 13.
  • a mounting frame according to FIG. 1, in which the electronic assemblies are secured in this manner, can also be subjected to extreme conditions such as on a rail vehicle without the danger of operational failures because of vibrations.
  • the locking bar 6a has two surfaces 14 and 15 on which markings can be applied. On the marking surface 15, designation strips can be inserted into grooves 15a and 15b. The markings on these designation strips correspond to the different individual assemblies. In FIG. 1 the markings for the individual assemblies 2 are indicated by the lettering panels 21a to 213.
  • FIG. 3 The cross-section of FIG. 3 is taken along the line III- -III of FIG. 1 and shows the particular kind of screw attachment which is selected for the illustrated embodiment and which can also be used, as already emphasized, for other locking bars.
  • the locking bar 6a is bolted into the mounting frame 1 by means of screws 7 which have a threaded part 7a and 7b between which a portion 7c of the screw is provided which has a smaller diameter than the threaded part.
  • the longitudinal slot 10 can be considered as having an innermost portion 19 and an ancillary portion 30 adjacent the innermost portion.
  • the threaded part 7a of the screw 7 threadably engages winding means in the form of a nut 17 which is inserted into grooves 18 at the ancillary portion 30 of the longitudinal slot 10.
  • the width of the grooves 18 is here substantially larger than the thickness of the nut 17.
  • the section 7c of the screw 7 and the second threaded part 7b protrude into the cavity 19 of the longitudinal slot 10, the height of which is greater than the threaded bore of the nut 17.
  • a corresponding bore can be arranged in the mounting frame 1, if the longitudinal stiffening rib 9 for the locking bar 6a is omitted.
  • the locking bar 6a can be removed from the mounting frame for the entire length of the section 70 of the screw. This condition is shown in cross-section of FIG. 3a. Because the diameter of the section 7c is smaller than the diameter of the threaded parts 7a and 7b and because the nut 17 can be tilted in the groove 18, the locking bar 6a which has already been pulled away from the mounting frame, can be tilted in the vertical direction downward or upward about an axis which is parallel to the longitudinal axis of the locking bar. The possible tilting angle mustin this connection be made large enough so that the assemblies can be withdrawn from the mounting frame or inserted into it without the edge 3 of the front panel 2 touching the locking bar.
  • this extreme position of the locking bar 6a is depicted by the broken line 20 which describes the path of the lower edge of the front panel 2 when the assembly is withdrawn or inserted.
  • This manner of tilting of the locking bar is advantageous because the marking on the locking bar remains unambiguously related to the mounting location of the assemblies and the markings are always readable.
  • a locking bar arrangement for securing a plurality of electronic assemblies disposed in a mounting frame and arranged in a row one next to the other comprising a locking bar mounted on the frame securing the assemblies therein, said locking bar having a surface directed toward the assemblies covering over an edge of each of the assemblies for securing the same, fastening means for removably bolting said locking bar to the mounting frame, and an elastic formed member disposed at said surface of said locking bar and extending therealong for substantially the entire length of said locking bar, said formed member being arranged on said surface with respect to the respective edges of the assemblies covered by said locking bar so as to cause said formed member to have pressed portions conjointly surrounding said edges when said locking bar is bolted to the mounting frame.
  • each of the electronic assemblies having two mutually adjacent sides defining an edge angle and conjointly forming the edge of the assembly covered over by said locking bar, said formed member having a contour and a location on said surface causing said pressed portion thereof to apply a force to the edge of each assembly in a direction coincident with the bisector of the edge angle.
  • said holding means being a groove extending longitudinally along said locking bar, said groove having a crosssectional contour corresponding to the sector of a circle.
  • said fastening means comprising screws mounted on said locking bar and extending into said cavity means, each of said screws having a thread interrupted by an intermediate shank portion, said screw having a diameter at said intermediate shank which is less than the diameter at said thread, said cavity means having an innermost portion and an ancillary portion adjacent said innermost portion, said innermost portion and said ancillary portion both being disposed beyond said first-mentioned portion of said cavity means engaging said portion of said projection of said locking bar, and winding means at said ancillary portion for threadably engaging a corresponding one of said screws when said locking bar is bolted to the mounting frame and for facilitating the movement of said shank portion through said winding means when said screw is threadably disengaged from the same whereby said locking bar can be moved a distance away from the mounting frame and tilted about an axis parallel to said longitudinal axis, said innermost portion being disposed in the mounting frame beyond said an cillary portion and being expanded
  • said ancillary portion of said cavity means including at least one groove formed in the mounting frame, and said winding means being a nut threadably engaging said corresponding screw, said groove having a width greater than the thickness of said nut.
  • said fastening means comprising screws mounted on said locking bar, each of said screws having a thread interrupted by an intermediate shank portion, said screw having a diameter at said intermediate shank portion which is less than the diameter at said thread, respective bore means formed in the mounting frame for accommodating said screws therein, each of said bore means having an innermost portion and an ancillary portion adjacent said innermost portion, and winding means at said ancillary portion for threadably engaging a corresponding one of said screws when said locking bar is bolted to the mounting frame and for facilitating the movement of said shank portion through said winding means when said screw is threadably disengaged from the same whereby said locking bar can be moved a distance away from the mounting frame and tilted about an axis parallel to said longitudinal axis, said innermost portion being disposed in the mounting frame beyond said ancillary portion and being expanded to form a cavity.
  • each of said bore means including at least one groove formed in the mounting frame, and said winding means being a nut threadably engaging the screw corresponding to said bore means, said groove having a width greater than the thickness of said nut.
  • a locking bar arrangement for securing a plurality of electronic assemblies disposed in a mounting frame and arranged in a row, one next to the other, comprising a locking bar mounted on the frame and securing the assemblies therein, said locking bar having a surface directed toward the assemblies covering an edge of each of the assemblies for securing the same, said locking bar having a longitudinal axis, and fastening means comprising screws mounted on said locking bar, each of said screws having a thread interrupted by an intermediate shank portion, said screw having a diameter at said intermediate shank portion which is less than the diameter at said thread, respective bore means formed in the mounting frame accomodating said screws therein, each of said bore means having an innermost portion and an ancillary portion adjacent said innermost portion, said ancillary portion being of a smaller diameter at least at the boundary between said innermost portion and said ancillary portion and winding means at said ancillary portion threadably engaging a corresponding one of said screws when said locking bar is bolted to the mounting frame and for facilitating the movement of
  • said ancillary portion of said bore means including at least one groove formed in the mounting frame, and said winding means being a nut threadably engaging said corresponding screw, said groove having a width greater than the thickness of said nut.
  • said locking bar having at least one projection, and cavity means formed in the mounting frame for receiving said projection therein, said cavity means and said projection having respective portions configured so as to be mutually engaged in a form-fit manner when said locking bar is bolted to the mounting frame and wherein said cavity forms said respective bore means with said innermost portion and said ancillary portion both being disposed beyond said first-mentioned portion of said cavity means engaging said portion of said projection of said locking bar.
  • said ancillary portion of said cavity means including at least one groove formed in the mounting frame, and said winding means being a nut threadably engaging said corresponding screw, said groove having a width greater than the thickness of said nut.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Casings For Electric Apparatus (AREA)
  • Mounting Of Printed Circuit Boards And The Like (AREA)
  • Connection Of Plates (AREA)
US00343956A 1972-03-24 1973-03-22 Locking bar arrangement for securing electronic assemblies Expired - Lifetime US3831064A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2214537A DE2214537C3 (de) 1972-03-24 1972-03-24 Verriegelungsblende zur Sicherung elektronischer Baugruppen

Publications (1)

Publication Number Publication Date
US3831064A true US3831064A (en) 1974-08-20

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ID=5840108

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Application Number Title Priority Date Filing Date
US00343956A Expired - Lifetime US3831064A (en) 1972-03-24 1973-03-22 Locking bar arrangement for securing electronic assemblies

Country Status (13)

Country Link
US (1) US3831064A (ko)
JP (1) JPS5549435B2 (ko)
AT (1) AT318708B (ko)
BE (1) BE797156A (ko)
CA (1) CA984497A (ko)
CH (1) CH557129A (ko)
DE (1) DE2214537C3 (ko)
FR (1) FR2177847B1 (ko)
GB (1) GB1414547A (ko)
IT (1) IT981547B (ko)
NL (1) NL7303282A (ko)
NO (1) NO134785C (ko)
SE (1) SE378737B (ko)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0155545A2 (en) * 1984-03-23 1985-09-25 Marposs Societa' Per Azioni A drawer for electrical cabinets
EP0527608A1 (en) * 1991-08-09 1993-02-17 GOULD INSTRUMENT SYSTEMS, Inc. Locking device for electronic module

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5617991Y2 (ko) * 1975-10-15 1981-04-27
DE2615671C2 (de) * 1976-04-09 1983-02-17 Siemens AG, 1000 Berlin und 8000 München Verriegelungsblende zur Sicherung elektronischer Baugruppen
US4215386A (en) * 1978-03-03 1980-07-29 Modicon Division, Gould Inc. Modular panel construction for programmable controller
GB2044544B (en) * 1978-12-21 1983-03-23 Finike Italiana Marposs Drawer for electric cabinets
JPS58130209A (ja) * 1982-01-29 1983-08-03 Sumitomo Heavy Ind Ltd 還元鉄の製鋼法
DE3537835A1 (de) * 1985-10-24 1987-04-30 Ant Nachrichtentech Halterung fuer ein gehaeuse in einem gestell
DE3667583D1 (de) * 1986-03-24 1990-01-18 Benke Instr & Elektro Ag Prozessanalysator-system fuer industrielle prozesse.
DE3709041C2 (de) * 1987-03-19 1994-01-27 Siemens Ag Vorrichtung zur Verriegelung von in ein Gehäuse eingebrachten Baugruppenträgerplatten
DE10139647C1 (de) * 2001-08-11 2003-01-16 Schroff Gmbh Elektronikschrank

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3098177A (en) * 1961-09-15 1963-07-16 Gen Dynamics Corp Universal cell for printed circuit boards
US3360689A (en) * 1965-11-26 1967-12-26 Bell Telephone Labor Inc Modular plug-in component with improved support element
US3566190A (en) * 1968-12-23 1971-02-23 Raven Ind Inc Industrial control system with means for releasably securing a plurality of electronic modules

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1690021B1 (de) * 1967-08-04 1971-08-12 Siemens Ag Einrichtung zur Sicherung steckbarer Flachbaugruppen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3098177A (en) * 1961-09-15 1963-07-16 Gen Dynamics Corp Universal cell for printed circuit boards
US3360689A (en) * 1965-11-26 1967-12-26 Bell Telephone Labor Inc Modular plug-in component with improved support element
US3566190A (en) * 1968-12-23 1971-02-23 Raven Ind Inc Industrial control system with means for releasably securing a plurality of electronic modules

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0155545A2 (en) * 1984-03-23 1985-09-25 Marposs Societa' Per Azioni A drawer for electrical cabinets
EP0155545A3 (en) * 1984-03-23 1986-01-02 Finike Italiana Marposs S.P.A. A drawer for electrical cabinets
US4609235A (en) * 1984-03-23 1986-09-02 Finike Italiana Marposs S.P.A. Drawer for electrical cabinets
EP0527608A1 (en) * 1991-08-09 1993-02-17 GOULD INSTRUMENT SYSTEMS, Inc. Locking device for electronic module
US5226716A (en) * 1991-08-09 1993-07-13 Gould Inc. Locking device for electronic module

Also Published As

Publication number Publication date
DE2214537A1 (de) 1973-10-04
JPS496452A (ko) 1974-01-21
NO134785C (ko) 1976-12-15
CA984497A (en) 1976-02-24
NO134785B (ko) 1976-08-30
BE797156A (fr) 1973-09-24
AT318708B (de) 1974-11-11
FR2177847A1 (ko) 1973-11-09
IT981547B (it) 1974-10-10
GB1414547A (en) 1975-11-19
DE2214537C3 (de) 1981-06-25
DE2214537B2 (de) 1976-04-15
SE378737B (ko) 1975-09-08
CH557129A (de) 1974-12-13
FR2177847B1 (ko) 1976-11-05
NL7303282A (ko) 1973-09-26
JPS5549435B2 (ko) 1980-12-11

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