US2904360A - Framework structures - Google Patents

Framework structures Download PDF

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Publication number
US2904360A
US2904360A US744816A US74481658A US2904360A US 2904360 A US2904360 A US 2904360A US 744816 A US744816 A US 744816A US 74481658 A US74481658 A US 74481658A US 2904360 A US2904360 A US 2904360A
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US
United States
Prior art keywords
bar
corner
bolt
arm
bars
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
US744816A
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English (en)
Inventor
Gamlen Donald Reginald
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.)
Hallam Sleigh and Cheston Ltd
Original Assignee
Hallam Sleigh and Cheston Ltd
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
Priority to BE569069D priority Critical patent/BE569069A/xx
Application filed by Hallam Sleigh and Cheston Ltd filed Critical Hallam Sleigh and Cheston Ltd
Priority to US744816A priority patent/US2904360A/en
Application granted granted Critical
Publication of US2904360A publication Critical patent/US2904360A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B12/00—Jointing of furniture or the like, e.g. hidden from exterior
    • F16B12/44—Leg joints; Corner joints
    • F16B12/50—Metal corner connections
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B47/00—Cabinets, racks or shelf units, characterised by features related to dismountability or building-up from elements
    • A47B47/0008—Three-dimensional corner connectors, the legs thereof being received within hollow, elongated frame members
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B2220/00—General furniture construction, e.g. fittings
    • A47B2220/11—Tripod parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B12/00—Jointing of furniture or the like, e.g. hidden from exterior
    • F16B12/44—Leg joints; Corner joints
    • F16B2012/446—Leg joints; Corner joints with three-dimensional corner element, the legs thereof being inserted in hollow frame members
    • 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
    • Y10T403/34—Branched
    • Y10T403/341—Three or more radiating members
    • Y10T403/342—Polyhedral
    • Y10T403/343—Unilateral of plane

Definitions

  • This invention relates to framework structures for use in the construction of cabinets andracks such as are used for housing electronic equipment, boxes, tables, desks and other furniture, and the like, said structures being of the kind comprising separate frame bars connected together at the corners of the structure by means of three-armed corner piecesithe arms of which extend in the directions o'f'the respective bars.
  • a skeleton framework of "this kind for use in constructing aicabinet or box there would be, at top and bottom, horizontal bars at right-angles or other angles to one another and connected by the corner pieces to vertical corner bars, all the bars having provision whereby panels may be attached to them to complete theenclosure.
  • the bars have been connected to the corner pieces by means of a number of screws, bolts and nuts or rivets at each end, said screws or the like beingpassed through both overlapping parts, and being visible from the outside.
  • a large number of such screws or the like were required for the complete structure, and although a very rigid structure was obtained, the drilling of the necessary holes and the fitting of the screws or the like has required alarge amount of time and labour.
  • the object of the present invention is to provide a framework structure in which the parts can be rapidly assembled without loss ofrigidity, andin which the connecting means are concealed-from view from the exterior of the structure.
  • the frame bars are of a cross-sectional shape which provides at the back a longitudinal recess or hollow interior having a longitudinal restricted entrance slot or mouth which is of a width less than. the maximum interior width of. saidrecess, or interior, and each bar is connectedto anarm ofacorner piece of the structure by means of a bolt having thereon a head or n'ut which interlockingly engages the said recess or interioiythe shank of the bolt being engaged in an aperture in the corner-piece arm so that when thebolt is tightened upthe bar will be securely fixed to the corner piece.
  • FIG. 1 Figure-l of the accompanying drawings is'a perspective view of a top corner piece andporti'ons of its associated frame bars, constructed and adapted for connection in accordance with the present invention, the said corner pieceand bars being shown separated from one another.
  • Figure 2 is an inside perspective View of the saidcorner pieceand bars when assembled.
  • Figure 3' is a, perspective viewof one of. the corner pieces.
  • Figure 4 is a plan view thereof.
  • Figure 5 is a cross-section through one of the frame bars.
  • Figure 6 is a cross-section through an assembled frame bar and corner piece.
  • Figure 7 is a similar cross-section through a modified form of frame bar and assembled corner piece.
  • Figure '8' is a section through another form of bar and corner piece.
  • Figure 9 is an interior perspective view of. a lower corner of the structure showing how the corner piece may be utilised forcarrying a hinge.
  • Figure '10 is a crossesectional'view showing a modified arrangement of the fixing bolt wherein" the union the bolt is located within the interior of theframe'bar;
  • the framework wouldhave six sides formed by eight separate corner pieces connected together by separate metal bars, some of the bars being longitudinal top and bottom bars, others transverse'top and bottom bars, and the remainder vertical corner bars, adjacent ends of horizontal, transverse and vertical bars being seated upon and connected to the respective three arms of a corner piece.
  • Each corner piece comprises a dome-shaped or radius'ed central part 1 from which extend the three arms 2, 2, 2,. for supporting the frame bars 3,- 3, 3, two of said arms extendinghorizontally at right-angles andthe third being vertical, and each arm being set-down or steppedin relation to the central part 1' of the corner piece so that when the frame bars are seated onthe arms they lie'flus'h with the central part.
  • Each arm is obliquely fi'at on its outer face at 4, with flanges '5 at its edges, toform a seat-' in g surface forafram'e bar 3,.andit is drilled with a'hole: 6 to receive a fixing bolt ashereinafter described.
  • the frame bars S' are each'cut froman'extruded sec-- tioned strip to the required length to suit the size of -thecabinet to be constructed, and are of a sectional shape such as to' form a transversely-curved longitudinal'outer central part7 and set-down or stepped flanges 8 at opp0-- site'edges, said flanges, which seat on the'edge flanges 5 ofthe corner-piece arms, being in planes at-right-angl'es: and being intendedto-have the cabinet panels attached-to them,
  • Each frame bar '3 has a longitudinal recess or 'hollow' interior. bounded, at the back, by-twoobliqueandaligned flat flanges 9 which form, with the curved front, asegmentaleshaped recess, and which are: separated-at the middle, between their opposed edges, by a longitudinal slot '10 of considerably less width'than the maximum-interior width of the recess.
  • the -flat flanges9 can beseated on the flat oblique surfaces 4 of. the corner-piece-arms, as shown in Figures 2 and 6.
  • a washer Misplaced 'overtlie bolt'shank anda'nut 15 is screwedon to thethreadedend of the shank.
  • this nut is tightened it will, by means of the boltihead -ll and washer lfi, drawdownthe bar 3 firmly on to i the outer surface of? the corner-piece arm 2, with its outer curved "part 7 flu'shzwiththe' domedcenti'e part1 of the corner piece. v e 5?
  • each bar is provided, on its interior face, with two parallel ribs 16 spaced apart by a distance equal to the width across two facets of the bolt head 12, and the said bolt head engages between the ribs, as shown in Figure 6.
  • the corner pieces are conveniently formed as die castings and the vertical arm 2 may have a-longitudinal thickened rib 17 through which the bolt hole 6 is formed. This rib engages the slot 10 of a bar 3 and it is drilled with a longitudinal hole 18 (Figure 2) which can receive a hinge pin 19, as shown in Figure 9 (in connection With the bottom corner piece), for mounting a hinge 20.
  • the hollow i11- terior of the bar may have flat parallel interior side walls or surfaces between which the bolt head slidably fits. If a bolt with a slotted head is used, a projection on the interior surface of the part 7 of the bar could engage the slot. Or a coach-type bolt may be used provided, below the head, with flat faces that fit the slot 10 of the bar 3.
  • each frame bar 3 forms, with the stepped flanges 8, a transversely-curved longitudinal groove or recess 22 at the back of the bar, the side walls 23 of such groove or recess being in radial planes at right-angles to one another, so as to form, across the outer corners of these walls, a longitudinal entrance slot or mouth which is of less width than the maximum interior width of the groove or recess, that is, across the inner ends of said radially-disposed side walls.
  • the recess or groove 22 is thus of substantially dovetail or undercut section.
  • the bolt 11 In order to connect an end of a bar to the appropriate corner-piece arm 2 (which may be transversely curved), the bolt 11 has a large transversely-curved head 24 of rectangular contour with bevelled ends, and of generally dovetail shape in end elevation, being of a thickness and width such as to correspond, in cross-section, to the cross-sectional shape of the dovetail groove or recess 22 in the bar.
  • the head is slid into the groove of the bar from one end thereof before the bar is assembled, being thus interlocked therewith, and said bar is then seated on the corner-piece arm so that the projecting shank of the bolt enters the pre-drilled hole 6 in the said arm and projects from the interior face of the arm.
  • the bolt 11 may be reversed as shown in Figure 10, the nut 15 being within the interior of the bar 3, and the head 12 of the bolt being behind the arm 2.
  • the nut 15 may be prevented from turning by any suitable means, such as by the ribs 16 (as in Figure 6).
  • a framework structure comprising corner pieces each having three symmetrically-disposed arms extending in different directions from a central body part and each being set down in relation to said central body part to form a shoulder therewith, in combination with three frame bars of non-circular cross sectional shape seated on the respective arms with their ends in abutting relation with the shoulders thereof and each having an outer surface along the middle portion lying flush with the surface of the central part of an arm, each of said arms having side flanges at an angle to one another joined by an apertured intermediate part disposed in a general oblique direction between said flanges, and each frame bar having, at opposite sides of the middle portion, flanges at an angle to one another and seating upon the side flanges of a corner-piece arm, each said frame bar also having at the back a longitudinal recess provided with a restricted entrance slot of a width less than the maximum interior width of said recess, and the bar being connected to an arm of the corner piece by means of a fixing bolt which extends through the apertured arm and
  • a framework structure comprising corner pieces each having three symmetrically-disposed arms extending in diiferent directions from a central body part and each set down in relation to said central body part to form a shoulder therewith, in combination with three frame bars of non-circular cross-sectional shape seated on the respective arms with their ends abutting against the shoulders thereof, each of said arms having side flanges disposed at an angle to one another and joined by an apertured intermediate part disposed in a general oblique direction between said flanges, and each frame bar having, at opposite sides, flanges at an angle to one another and seating upon the side flanges of a corner piece arm, each said frame bar also having a longitudinal recess at the back provided with a restricted entrance slot of a width less than the maximum interior width of said recess, and the bar being connected to an arm of the corner piece by means of a fixing bolt which extends through the apertured arm and the entrance slot of the bar and which has a part of larger size than the width of said slot, which part
  • each of the frame bars has a longitudinal interior bounded, at the back, by two oblique and aligned flat flanges separated by a longitudinal slot for receiving the fixing bolt, and the corresponding arm of a corner piece has a flat oblique intermediate part joining the side flanges, the said flanges of the frame bar seating upon the said flat oblique part of the arm.
  • each frame bar has at the back a shallow longitudinal recess of dovetail form curved transversely to correspond to the convex outer surface of the bar, said recess being bounded at opposite sides by converging bevelled walls to form an entrance slot of less width than the maximum interior width of the recess, and the said frame bar being connected to an arm of a corner piece by means of a bolt having a curved head with opposite bevelled edges and conforming to the cross-sectiona1 shape of the recess in the bar, being in slidable engagement with said recess.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Furniture Connections (AREA)
US744816A 1958-06-26 1958-06-26 Framework structures Expired - Lifetime US2904360A (en)

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BE569069D BE569069A (un) 1958-06-26
US744816A US2904360A (en) 1958-06-26 1958-06-26 Framework structures

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Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3068968A (en) * 1958-07-01 1962-12-18 Ratby Engineering Company Ltd Constructional systems using section strut material
US3089716A (en) * 1960-02-04 1963-05-14 Kason Display Hardware Inc Fitting for attaching together tubular members
US3144265A (en) * 1960-03-01 1964-08-11 Alfred Imhof Ltd Rigid frameworks for use in constructiong racks, cabinets, boxes or like structures
US3346310A (en) * 1965-06-28 1967-10-10 Arthur G Diack Showcase construction
US3523703A (en) * 1969-03-19 1970-08-11 Sternco Ind Inc Miter corner construction
US3601430A (en) * 1967-12-13 1971-08-24 Hendrik Pieter Zwennis Joints between structural members
US3728833A (en) * 1971-03-11 1973-04-24 A Grossman Frame construction having arcuate corners and a continuous feature strip
US3912087A (en) * 1973-03-02 1975-10-14 Hefendahl Hans Friedrich Modular frame assembly for making furniture such as tables, shelves, and the like
US4037376A (en) * 1975-06-23 1977-07-26 Baal Taxa Baruch Building structure
US4413570A (en) * 1980-02-27 1983-11-08 Knoll International, Inc. Table easily assembled from standardized parts and corner clamping assembly usable therewith
US4419938A (en) * 1980-12-06 1983-12-13 Albin Kaut Plug-assembled sectional display rack
US4544069A (en) * 1983-05-26 1985-10-01 Gianfranco Cavallini Modular elements for composing frames for the construction of cabinet structures and containers for electrical, electromechanical and electronic components, for internal and external use
EP0235069A1 (en) * 1986-02-27 1987-09-02 Isabel Perez Cidre Assembly pieces for metallic carpentry sections
US4693524A (en) * 1983-12-27 1987-09-15 Navarro Vicente N Component elements for building furniture
US4726701A (en) * 1986-06-19 1988-02-23 Thomas Olivier A Modular shelf assembly
US5095677A (en) * 1986-09-22 1992-03-17 Les Concepts Polystand Inc. Combination for use in mounting a modular system
US5516225A (en) * 1994-05-04 1996-05-14 Kvols; Kevin Corner connector and molding therefor
DE29619965U1 (de) * 1996-11-16 1997-01-09 Festo Kg, 73734 Esslingen Vorrichtung zum Verbinden dreier Längselemente
US5918998A (en) * 1996-10-18 1999-07-06 Pourmand; Tooraj Joint for three-dimensional framed structures for interior and construction use
US6050738A (en) * 1995-07-15 2000-04-18 Rittal-Werk Rudolf Loh Gmbh Device for fitting a control panel to the lower front edge of a control device
US20060076858A1 (en) * 2004-10-11 2006-04-13 Victor Nohl Modular enclosure system
US20120024811A1 (en) * 2010-07-28 2012-02-02 Hon Hai Precision Industry Co., Ltd. Rack frame assembly
US20120128405A1 (en) * 2010-11-23 2012-05-24 Tekpan Teknik Elektrik Kumanda Pano Sanayi Ve Turizm Ticaret Limited Sirketi Construction profiles corner assembling system
US20150208798A1 (en) * 2014-01-30 2015-07-30 Land 1 Brands, LLC Connector piece for connecting multiple legs
EP3369679A1 (en) * 2017-03-02 2018-09-05 Envirotainer Engineering AB Frame structure, method of assembling
USD829086S1 (en) * 2017-09-19 2018-09-25 University Of West Bohemia Corner bracket
USD830818S1 (en) * 2017-09-19 2018-10-16 University Of West Bohemia Corner bracket
RU188208U1 (ru) * 2018-08-17 2019-04-03 Александр Равильевич Минибаев Элемент жесткости стеллажной конструкции
USD918018S1 (en) * 2020-04-22 2021-05-04 Kevin Laaksonen Bracket
US20220066299A1 (en) * 2020-08-28 2022-03-03 Coretronic Corporation Frame module and projection device
USD1015122S1 (en) * 2019-10-29 2024-02-20 6866336 Canada Inc. Tubing and corner cover for a tarp enclosure
ES2964421A1 (es) * 2022-09-05 2024-04-05 Univ Del Pais Vasco / Euskal Herriko Unibertsitatea Nudo de union para la construccion de estructuras

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2681403B1 (fr) * 1991-09-18 1994-11-04 Legrand Sa Dispositif d'assemblage pour profiles d'ossature, ossature correspondante, et armoire, en particulier armoire pour appareillages electriques, mettant en óoeuvre une telle ossature.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US643588A (en) * 1898-11-12 1900-02-13 David Davies Furniture.
US855195A (en) * 1907-02-16 1907-05-28 George C Marr Expansion-post and show-window fastener.
US1381149A (en) * 1919-06-23 1921-06-14 Wheary George Henry Reinforced trunk-edge construction
US2167525A (en) * 1935-08-08 1939-07-25 Western Electric Co Cabinet
US2806755A (en) * 1955-02-21 1957-09-17 Henry P Glass Cabinet or desk structures employing framework arranged outside of panel members

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US643588A (en) * 1898-11-12 1900-02-13 David Davies Furniture.
US855195A (en) * 1907-02-16 1907-05-28 George C Marr Expansion-post and show-window fastener.
US1381149A (en) * 1919-06-23 1921-06-14 Wheary George Henry Reinforced trunk-edge construction
US2167525A (en) * 1935-08-08 1939-07-25 Western Electric Co Cabinet
US2806755A (en) * 1955-02-21 1957-09-17 Henry P Glass Cabinet or desk structures employing framework arranged outside of panel members

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3068968A (en) * 1958-07-01 1962-12-18 Ratby Engineering Company Ltd Constructional systems using section strut material
US3089716A (en) * 1960-02-04 1963-05-14 Kason Display Hardware Inc Fitting for attaching together tubular members
US3144265A (en) * 1960-03-01 1964-08-11 Alfred Imhof Ltd Rigid frameworks for use in constructiong racks, cabinets, boxes or like structures
US3346310A (en) * 1965-06-28 1967-10-10 Arthur G Diack Showcase construction
US3601430A (en) * 1967-12-13 1971-08-24 Hendrik Pieter Zwennis Joints between structural members
US3523703A (en) * 1969-03-19 1970-08-11 Sternco Ind Inc Miter corner construction
US3728833A (en) * 1971-03-11 1973-04-24 A Grossman Frame construction having arcuate corners and a continuous feature strip
US3912087A (en) * 1973-03-02 1975-10-14 Hefendahl Hans Friedrich Modular frame assembly for making furniture such as tables, shelves, and the like
US4037376A (en) * 1975-06-23 1977-07-26 Baal Taxa Baruch Building structure
US4413570A (en) * 1980-02-27 1983-11-08 Knoll International, Inc. Table easily assembled from standardized parts and corner clamping assembly usable therewith
US4419938A (en) * 1980-12-06 1983-12-13 Albin Kaut Plug-assembled sectional display rack
US4544069A (en) * 1983-05-26 1985-10-01 Gianfranco Cavallini Modular elements for composing frames for the construction of cabinet structures and containers for electrical, electromechanical and electronic components, for internal and external use
US4693524A (en) * 1983-12-27 1987-09-15 Navarro Vicente N Component elements for building furniture
EP0235069A1 (en) * 1986-02-27 1987-09-02 Isabel Perez Cidre Assembly pieces for metallic carpentry sections
US4726701A (en) * 1986-06-19 1988-02-23 Thomas Olivier A Modular shelf assembly
US5095677A (en) * 1986-09-22 1992-03-17 Les Concepts Polystand Inc. Combination for use in mounting a modular system
US5516225A (en) * 1994-05-04 1996-05-14 Kvols; Kevin Corner connector and molding therefor
US6050738A (en) * 1995-07-15 2000-04-18 Rittal-Werk Rudolf Loh Gmbh Device for fitting a control panel to the lower front edge of a control device
US5918998A (en) * 1996-10-18 1999-07-06 Pourmand; Tooraj Joint for three-dimensional framed structures for interior and construction use
DE29619965U1 (de) * 1996-11-16 1997-01-09 Festo Kg, 73734 Esslingen Vorrichtung zum Verbinden dreier Längselemente
US20060076858A1 (en) * 2004-10-11 2006-04-13 Victor Nohl Modular enclosure system
US20120024811A1 (en) * 2010-07-28 2012-02-02 Hon Hai Precision Industry Co., Ltd. Rack frame assembly
US8292093B2 (en) * 2010-07-28 2012-10-23 Hon Hai Precision Industry Co., Ltd. Rack frame assembly
US20120128405A1 (en) * 2010-11-23 2012-05-24 Tekpan Teknik Elektrik Kumanda Pano Sanayi Ve Turizm Ticaret Limited Sirketi Construction profiles corner assembling system
US9179767B2 (en) * 2014-01-30 2015-11-10 Land 1 Brands, LLC Connector piece for connecting multiple legs
US20150208798A1 (en) * 2014-01-30 2015-07-30 Land 1 Brands, LLC Connector piece for connecting multiple legs
EP3369679A1 (en) * 2017-03-02 2018-09-05 Envirotainer Engineering AB Frame structure, method of assembling
USD829086S1 (en) * 2017-09-19 2018-09-25 University Of West Bohemia Corner bracket
USD830818S1 (en) * 2017-09-19 2018-10-16 University Of West Bohemia Corner bracket
RU188208U1 (ru) * 2018-08-17 2019-04-03 Александр Равильевич Минибаев Элемент жесткости стеллажной конструкции
USD1015122S1 (en) * 2019-10-29 2024-02-20 6866336 Canada Inc. Tubing and corner cover for a tarp enclosure
USD918018S1 (en) * 2020-04-22 2021-05-04 Kevin Laaksonen Bracket
US20220066299A1 (en) * 2020-08-28 2022-03-03 Coretronic Corporation Frame module and projection device
ES2964421A1 (es) * 2022-09-05 2024-04-05 Univ Del Pais Vasco / Euskal Herriko Unibertsitatea Nudo de union para la construccion de estructuras

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