Connect public, paid and private patent data with Google Patents Public Datasets

Interengageable construction elements with resilient clutching parts

Download PDF

Info

Publication number
US3550311A
US3550311A US3550311DA US3550311A US 3550311 A US3550311 A US 3550311A US 3550311D A US3550311D A US 3550311DA US 3550311 A US3550311 A US 3550311A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
elements
element
construction
body
clutching
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
Inventor
John J Fouquart
Original Assignee
John J Fouquart
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
Grant date

Links

Images

Classifications

    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63HTOYS, e.g. TOPS, DOLLS, HOOPS, BUILDING BLOCKS
    • A63H33/00Other toys
    • A63H33/04Building blocks, strips, or similar building parts
    • A63H33/06Building blocks, strips, or similar building parts to be assembled without the use of additional elements
    • A63H33/065Building blocks, strips, or similar building parts to be assembled without the use of additional elements using elastic deformation

Description

J. J. FOUQUART 3,550,311 INTERENGAGEABLE CONSTRUCTION ELEMENTS WITH Dec. 29, 1970 RESILIENT CLUTCBING PARTS 2 sheets-sheet 1 Filed Sept. 20. 1967 FIG./

FIG 2b INVI'JN'I'UH. JOHNJ.FOUQUART Dec. 29, 1970 J FQUQUART 3,550,311

INTERENGAGEABLE CONSTRUCTION ELEMENTS WITH RESILIENT CLUTCHING PARTS 2 Sheets-Sheet 2 Filed Sept. 20, 196'.

F/G.4d 4

S V.T TY, R W T A m N U H mm A Mm m 9 u. 4 M O J G M United States Patent 3,550,311 INTERENGAGEABLE CONSTRUCTION ELEMENTS WITH RESILIENT CLUTCHING PARTS John J. Fouquart, 873 Park Ave., Huntington, N.Y. 11743 Filed Sept. 20, 1967, Ser. No. 669,238

Int. Cl. A63h 33/08 US. Cl. 46-28 8 Claims ABSTRACT OF THE DISCLOSURE Interengageable construction elements, particularly suited for children but also useful in regular constructions, each such element being made in the form of an elongated body having resiliently engageable clutching elements at the ends thereof. This body is provided with spaced annular ribs and the clutching elements thereon form extensions of the body terminating in a cylindrical extremity. Also, each clutching element has a circular opening to receive the extremity of another clutching element.

DRAWING DETAILED DESCRIPTION This invention relates to construction elements particularly suitable for childrens entertainment, but which can also be used for structure research, models, and useful constructions such as lattice-work for creeping plants, safety rafts, or the like.

The principle of the element of the invention is quite simple. It can be manufactured from a semi-rigid material, there being provided a cylindrical body with a halfopen grip at each end. The outer diameter of the body is equal to the inner diameter of the grips so that each ele ment can clutch the body of any other element. Both grips are open sidewards preferably on the same side in order, firstly, to enable the easy clutching of an element on a previously made construction (a median of a rectangle for instance) and, secondly, to prevent any disconnection, by a lengthwise traction, of clutched elements. The body of the element can be provided with shoulders or ribs defining a number of grooves in which new elements can be clutched in any position without any possibility of sidewards movements.

This simple design enables a wide variety of assemblies. In two dimensions all kinds of rigid or articulated latticework are possible; in three dimensions, a complete range of squareor rectangularor polygonal-based assemblies, articulated or rigid are possible as well. Rigidity is obtained by clutching diagonal elements, or by opposing under a 90 angle the direction of the grips of some elements of the construction.

The size of the elements may vary from a few inches to several feet, depending upon the chosen material. The very simple design of the element is specially convenient for the production of plastic or rubber-inflated elements, the latter being provided with a small air valve. Indeed, the welding of air-proof plastics or rubber sheets is quite easy to effect, particularly when using the heating properties of high electric or acoustic frequencies, and the weld- 3,550,311 Patented Dec. 29, 1970 ing profile, corresponding with the development of the cylindrical body and of the round grips can be realized in a single plane. The stiffness of the grips will depend on the inner air pressure. It can be easily sufiicient to insure a good grasp of the different elements on each other and to enable the assembly of all kinds of out-doors constructions, mattresses, safety or rest rafts and so forth.

Large elements can be manufactured as well out of semi-rigid or rigid expanded materials such as rubber, polyurethane or polystyrene foam, by the cutting of boards, or by the convenient molding of foam cells.

The element is preferably produced in a small size, and manufactured by the injection molding of a thermoplastic material. The range of the available materials is wide enough to offer every quality of stiffness and grasping strength which may be useful. Moreover, this last technique enables some interesting improvements of the outlines of the element, thus offering very advantageous possibilities of construction.

With more particular reference to the drawing, one embodiment of the invention is illustrated in FIG. 1. This embodiment comprises an elongated body or cylindrical rod 10 of a length a and on which are mounted a plurality of concentric annular rings 12 integral with said rod. These rings divide the rod into a plurality of seg ments 14, the total of which is preferably odd in number so that one of the segments constitutes the exact center of the rod. At the ends of the rod 10 are clutching elements or grippers 16 and 18 having centrally located openings 20 and 22, the diameters of which approximate that of the rod 10. Slots 24 and 26 are provided by means of which openings 20 and 22 open outwardly to the same side of the rod 10. The slots 24 and 26 are of a dimension which is less than the diameter of the rod 10 so that another similar constructional element can be engaged by forcing the same through the slots 24 and 26 to a position of accommodation within the openings 20 and 22. The outer diameter b of each of the clutching elements is equal to the length l of the segments 14. The distance d from the center of the openings to the center of the segment next adjacent each of the clutching elements is preferably equal to the length l of the segments.

The above construction may preferably be fabricated of a monolithic structure of plastic or rubber or the like but can alternatively be fabricated, for example, such that the rod is made of metal and clutching elements 16 and 18 are made of plastic or rubber and affixed to said rod. Suitable plastics include, but are not limited to, polyethylene, polystyrene, polyurethane and so forth.

In the embodiment of the invention illustrated in FIGS. 2a and 2b, a structure is shown formed of inflatable rubber. In this embodiment of the invention a center rod 28 is provided at the ends of which are formed clutching elements 30 and 32. Conveniently disposed on this construction is a one-way valve 34 capable of admitting a pneumatic medium into the structure to enable the latter to assume its useful form. Known techniques for welding plastics or rubber sheets in hermetically sealed manner involve the use, as has been indicated above, of conventional high-frequency welding techniques. The rigidity of the grips or clutching elements will depend upon the pressure of the pneumatic medium and there will be an inherent resiliency such as will permit the insertion of the elements to be gripped through slots 36 and 38 into openings 40 and 42. Annular ribs may, of course, be provided on center rod 28 in the manner as has been indicated above with respect to FIG. 1.

A more sophisticated version of a construction element provided in accordance with the invention appears in FIG. 3. This construction is generally the same as has been dis cussed above and employs the circular rings or ribs defining an uneven number of grooves or segments as has already been discussed. In addition, the clutching elements have been modified in order to enable a linear assembly of construction elements without interruption of the regular succession of segments or grooves. In fact, the spacing of the succession of grooves is maintained from one element to the next in the succession so that the advantageous possibilities of construction present with the single element are also present in the assembly.

More particularly, in this embodiment of the invention there is included a center cylindrical rod or elongated body 48 having longitudinal axis 49. Body 48 has rings 50 thereon with coupling means 52 and 54 disposed on the ends thereof and extending in rectilinear alignment therewith. Between said rings, the body 48 is of at least substantially uniform cross-section. The coupling means includes clutching elements which consist of C-shaped portions56 and 58 connected by saw-tooth elements 60 and 62 to cylindrical elements 64 and 66. As indicated by dimensions x, the common length of the sections 68 is equal to the distance between the center of openings 70 and 72 to the centers of the next adjacent sections 68. These dimensions in turn are equal to the distances between the centers of openings 70 and 72 to the centers of cylindrical sections 64 and 66. The purpose of maintaining these dimensions will become apparent when viewed with respect to the various possible assemblies as will be discussed hereinafter.

In addition to the above dimensions, it will be noted that the diameters of cylindrical elements 64 and 66 are equal to the diameters of openings 70 and 72 which have laterally opening slots S of smaller dimensions. It will also be noted that sawtooth element 60 defines with cylindrical element 64 a saw-tooth opening 74 of a shape corresponding to that of saw-tooth element 60. A similar relationship is provided as between saw-tooth element 62 and cylindrical element 66 and the saw-tooth opening 76 defined therebetween.

The axes of the cylindrical elements 64 and 66 are parallel with the axes of openings 70 and 72. As will be shown, the C-shaped portions or clutching elements 56 and 58 are so dimensioned with respect to saw-tooth elements 60 and 62 as to permit other construction elements engaged in openings 70 and 72 to pivot between a 90 and 120 relationship with respect to rod 48. This will also be discussed hereinafter. 135 to 144 relationships are also permissible as will be shown.

FIGS. 4a-g illustrate various assemblies permissible with the construction element of FIG. 3. In FIG. 4a is shown a three-spoke arrangement consisting of construction elements 80, 82 and 84 with a hub 86 being formed of three interengaged clutching elements as have been described above. FIG. 4b shows another arrangement of three-construction elements 88, 90 and 92 wherein elements 90 and 92 are pivotable in respect of hub 94. FIG. 40 illustrates a rectilinear alignment of construction elements 96, 98 and 100 with clutching element assemblies 102 and 104 connecting said construction elements together. Assemblies 102 and 104 illustrate how the clutching elements are placed into mating engagement especially in respect of the mating saw-tooth openings and teeth. Also of particular interest in FIG. 40 is the perpendicular arrangement of a fourth construction element 106 whose clutching 108 is of such a width as to fit exactly onto one of the segments of construction element 96.

FIG. 4d illustrates the possibility of assuming angle m between construction elements 110 and 112, angle In being equal to 135, the same relationship being developed between construction elements 114, 116 and 118. In this arrangement it will be noted that the extremities 120 of the clutching elements come into abutting or nearly abutting relationship. The angle n in FIG. 4e illustrates the development of the 120 relationship between construction elements 122, 124, 126 and 128.

FIG. 4 illustrates a lattice arrangement, two forms thereof being illustrated at 130 and 132, dependent upon the location of the transverse elements 134 and 136. FIG.

4 4g illustrates a further lattice network 138 partitioned by a center member 140.

FIG. 4h illustrates a further possible arrangement consisting of an interengaged quadrilateral hub 142.

The constructions noted above can be supplemented by various accessories such as wheels, pulleys, panels and so forth to permit a wider latitude of usage. There is illustrated in FIG. 5, for example, a wheel 144 consisting of a rim 146, a hub 148 and spokes 150. The hub is provided with a central opening 152 in which the central rod 154 appears, the latter having been inserted via slot 156, the dimensions of which permit the rod to be inserted with force and locked in said opening. The resiliency of the materials employed will permit the insertion of the rod. Preferably, the diameter of spokes is equal to the diameter of rim 146 which is equal to the diameter of the opening 152.

Quite generally there has been discussed above an elongated body having resiliently openable clutching elements mounted on the spaced ends thereof. The clutching elements are preferably provided with openings which open to the same side of the associated body which preferably includes evenly spaced annular ribs longitudinally distributed along the body. The openings are at least substantially of the same size as the body so as to be able to accommodate the insertion of construction elements of like configuration.

Such construction elements as has been noted may be of a one-piece construction, an inflatable construction or an assembly of different elements. Accessories of the various types can be provided.

The clutching elements can be developed to permit a rectilinear alignment of a plurality of construction elements.

There will now be obvious to those skilled in the art many modifications and variations of the construction set forth hereinabove.

What is claimed is:

1. A construction element comprising an elongated body having a longitudinal axis and spaced ends and coupling means including resiliently openable clutching elements on said ends, said clutching elements being provided with openings having laterally directed slots which open to the same side of said body, said body including evenly spaced annular ribs longitudinally distributed along said body, said body being of at least substantially uniform cross-section between said ribs, said openings and body being of the same complementary shape, said coupling means being adapted to clutch the body of a similar construction element, each said clutching element defining a circular opening constituting one of the first said openings and said coupling means further including extensions extending away from said body in general alignment with the longitudinal axis thereof, each said extension including a cylindrical extremity rectilinearly aligned with the associated circular opening and longitudinal axis for fitting in mating relationship with an opening of a similar construction element to pivotally connect two such elements.

2. An element as claimed in claim 1, wherein the body and elements are of a one-piece plastic construction.

3. An element as claimed in claim 1 comprising a wheel including a rim, a hub, and spokes connecting said rim and hub, said hub being provided with a central opening and a slot smaller than said body and through which said body is resiliently forced into said opening.

4. An element as claimed in claim 1, wherein said ribs divide said body into an odd number of equal sections and wherein, with respect to each clutching element, the distance between the center of the next adjacent section of the body and the center of the circular opening is equal to the distance between the latter said center and the outer of the cylindrical extremity.

5. An element as claimed in claim 4, wherein the cylindrical extremities and the circular openings have parallel axes, each said clutching element further including a sawtooth element between the associated circular opening and cylindrical extremity.

6. An element as claimed in claim 5, wherein each sawtooth element and associated cylindrical extremity define a saw-tooth opening corresponding in shape to the sawtooth element.

7. An element as claimed in claim 6, wherein the opening of each clutching element opens outwardly through a passage so dimensioned that, with the cylindrical extension of a second construction element engaged therein, the latter said element can pivot either between a 90 and 120 or 135 and 144 relationship with the first said construction element.

8. A construction element comprising an elongated body having a longitudinal axis and spaced ends and coupling means including resiliently openable clutching elements on said ends, said clutching elements being provided with openings having laterally directed slots which open to the same side of said body, said body having segments of at least substantially uniform crosssection between said ends, said openings and body segments being of the same complementary shape, said coupling means being adapted to clutch the body of a similar construction element, each said clutching element defining a circular opening constituting one of the first said openings and said coupling 2 means further including extensions extending away from said body in general alignment with the longitudinal axis thereof, each said extension including a cylindrical extremity rectilinearly aligned with the associated circular opening and longitudinal axis for fitting in mating relationship with an opening of a similar construction element to pivotally connect two such elements.

References Cited UNITED STATES PATENTS 1,095,858 5/1914 Harrison 4628 2,710,488 6/ 1955 Schaper 4628 2,737,755 3/1956 Schigas 4628X 2,844,910 7/ 1958 Korchak 46----28 2,952,094 9/ 1960 Ebel 46--22X 2,959,888 11/1960 Noble 4628 3,102,609 9/1963 Gerard.

3,221,439 12/1965 Schaper 4629 3,392,480 7/1968 Stubbrnann 46--28X FOREIGN PATENTS 1,273,609 9/1961 France.

F. BARRY SHAY, Primary Examiner US. Cl. XR. 46--23

US3550311A 1967-09-20 1967-09-20 Interengageable construction elements with resilient clutching parts Expired - Lifetime US3550311A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US66923867 true 1967-09-20 1967-09-20

Publications (1)

Publication Number Publication Date
US3550311A true US3550311A (en) 1970-12-29

Family

ID=24685618

Family Applications (1)

Application Number Title Priority Date Filing Date
US3550311A Expired - Lifetime US3550311A (en) 1967-09-20 1967-09-20 Interengageable construction elements with resilient clutching parts

Country Status (1)

Country Link
US (1) US3550311A (en)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955814A (en) * 1975-02-20 1976-05-11 Shallenberger Lester G Balancing toy with ends of sockets and protrusions
US3994102A (en) * 1974-05-06 1976-11-30 Alley Friends Inflatable element and system
US4078793A (en) * 1975-07-25 1978-03-14 Allen William P Portable apparatus for delineating a playing area
US4309851A (en) * 1979-08-06 1982-01-12 Flagg Rodger H Structure of inflatable tubes with closed loop connectors
US4352255A (en) * 1980-12-04 1982-10-05 Warehime Norwood R Group use toy structural construction set
EP0127397A1 (en) * 1983-05-17 1984-12-05 Anthony William Green A construction element
US4758196A (en) * 1987-03-27 1988-07-19 Wang Tsung Hsien Block unit for making three-dimensional blocks composed of geometric points, lines and planes
US5056291A (en) * 1989-10-19 1991-10-15 Skilland Engineering, Ltd. Modular system for space frame structures
US5152230A (en) * 1983-06-20 1992-10-06 Yaffa Licari Joining means for securing articles together
US5393163A (en) * 1987-09-17 1995-02-28 Wolf; Elmar Lattice comprising rods and joints and the manufacture thereof
US5503497A (en) * 1994-09-19 1996-04-02 Op-D-Op, Inc. Ratchet link
US5582488A (en) * 1994-09-19 1996-12-10 Op-D-Op, Inc. Ratchet link
US5704186A (en) * 1995-01-24 1998-01-06 Tiltan 3 Dimensional Technologies Ltd. Construction element
US5897417A (en) * 1995-12-11 1999-04-27 Primordial, Llc Construction system
WO2003095055A2 (en) * 2002-05-07 2003-11-20 Jens Ole Sorensen Interlockable element for structure assembly set
US6672931B1 (en) 2000-11-14 2004-01-06 Jim Bagley Interconnectable model construction elements
US20040074068A1 (en) * 2002-10-19 2004-04-22 Browne Alan Lampe Releasable fastener system
US20040224601A1 (en) * 2003-02-07 2004-11-11 Jim Bagley Interconnectable model construction elements
US20050257476A1 (en) * 2004-05-20 2005-11-24 Saidoo Paul D Suspended ceiling system
US20060046604A1 (en) * 2004-09-02 2006-03-02 Dane Scarborough Toy construction set method and apparatus
US20080178821A1 (en) * 2007-01-26 2008-07-31 Aaron Lamstein Pet activity system
US7472666B1 (en) 2006-06-19 2009-01-06 Robert Richard Support frame for tarpaulin used for sheltering boats and other objects
US20090149110A1 (en) * 2004-09-02 2009-06-11 Dane Scarborough Toy construction set
WO2009103763A1 (en) * 2008-02-21 2009-08-27 Alu S.P.A. Modular support element for a display structure
WO2009130236A1 (en) * 2008-04-25 2009-10-29 Haspel Productontwikkeling B.V. Toy construction assembly
WO2009130435A1 (en) * 2008-04-24 2009-10-29 Rabah Aggar Construction toy
US20120034839A1 (en) * 2010-08-03 2012-02-09 Richard Michael Murphy Construction toy system with universal hub

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3994102A (en) * 1974-05-06 1976-11-30 Alley Friends Inflatable element and system
US3955814A (en) * 1975-02-20 1976-05-11 Shallenberger Lester G Balancing toy with ends of sockets and protrusions
US4078793A (en) * 1975-07-25 1978-03-14 Allen William P Portable apparatus for delineating a playing area
US4309851A (en) * 1979-08-06 1982-01-12 Flagg Rodger H Structure of inflatable tubes with closed loop connectors
US4352255A (en) * 1980-12-04 1982-10-05 Warehime Norwood R Group use toy structural construction set
EP0127397A1 (en) * 1983-05-17 1984-12-05 Anthony William Green A construction element
US5152230A (en) * 1983-06-20 1992-10-06 Yaffa Licari Joining means for securing articles together
US4758196A (en) * 1987-03-27 1988-07-19 Wang Tsung Hsien Block unit for making three-dimensional blocks composed of geometric points, lines and planes
US5393163A (en) * 1987-09-17 1995-02-28 Wolf; Elmar Lattice comprising rods and joints and the manufacture thereof
US5056291A (en) * 1989-10-19 1991-10-15 Skilland Engineering, Ltd. Modular system for space frame structures
US5503497A (en) * 1994-09-19 1996-04-02 Op-D-Op, Inc. Ratchet link
US5582488A (en) * 1994-09-19 1996-12-10 Op-D-Op, Inc. Ratchet link
US5704186A (en) * 1995-01-24 1998-01-06 Tiltan 3 Dimensional Technologies Ltd. Construction element
US5897417A (en) * 1995-12-11 1999-04-27 Primordial, Llc Construction system
US6672931B1 (en) 2000-11-14 2004-01-06 Jim Bagley Interconnectable model construction elements
WO2003095055A2 (en) * 2002-05-07 2003-11-20 Jens Ole Sorensen Interlockable element for structure assembly set
US6665993B2 (en) 2002-05-07 2003-12-23 Sorensen Research And Development Trust Interlockable element for structure assembly set
WO2003095055A3 (en) * 2002-05-07 2004-04-01 Jens Ole Sorensen Interlockable element for structure assembly set
US6925770B2 (en) 2002-05-07 2005-08-09 Sorensen Research And Development Trust Interlockable element for structure assembly set
US20040128935A1 (en) * 2002-05-07 2004-07-08 Sorensen Jens Ole Interlockable element for structure assembly set
US20040074068A1 (en) * 2002-10-19 2004-04-22 Browne Alan Lampe Releasable fastener system
US7140081B2 (en) * 2002-10-19 2006-11-28 General Motors Corporation Releasable fastener system
US20040224601A1 (en) * 2003-02-07 2004-11-11 Jim Bagley Interconnectable model construction elements
US6948998B2 (en) 2003-02-07 2005-09-27 Jim Bagley Interconnectable model construction elements
US20050257476A1 (en) * 2004-05-20 2005-11-24 Saidoo Paul D Suspended ceiling system
US20060046604A1 (en) * 2004-09-02 2006-03-02 Dane Scarborough Toy construction set method and apparatus
US7371146B2 (en) 2004-09-02 2008-05-13 Dane Scarborough Toy construction set method and apparatus
US20090149110A1 (en) * 2004-09-02 2009-06-11 Dane Scarborough Toy construction set
US7472666B1 (en) 2006-06-19 2009-01-06 Robert Richard Support frame for tarpaulin used for sheltering boats and other objects
US20090020147A1 (en) * 2006-06-19 2009-01-22 Robert Richard Support frame for tarpaulin used for sheltering boats and other objects
US20080178821A1 (en) * 2007-01-26 2008-07-31 Aaron Lamstein Pet activity system
US7669551B2 (en) * 2007-01-26 2010-03-02 Worldwise, Inc. Pet activity system
WO2009103763A1 (en) * 2008-02-21 2009-08-27 Alu S.P.A. Modular support element for a display structure
WO2009130435A1 (en) * 2008-04-24 2009-10-29 Rabah Aggar Construction toy
US20110092129A1 (en) * 2008-04-24 2011-04-21 Rabah Aggar Construction toy
WO2009130236A1 (en) * 2008-04-25 2009-10-29 Haspel Productontwikkeling B.V. Toy construction assembly
US20110059673A1 (en) * 2008-04-25 2011-03-10 Haspel Productontwikkeling B.V. Toy Construction Assembly
US20120034839A1 (en) * 2010-08-03 2012-02-09 Richard Michael Murphy Construction toy system with universal hub

Similar Documents

Publication Publication Date Title
US3360883A (en) Construction toy comprising connectors having orthogonal channels
US3496670A (en) Hollow construction toy with hinged connector
US3392480A (en) Child's construction game
US3566531A (en) Mating blocks having beaded studs and resilient sidewalls
US3540151A (en) Moving vehicle type toy
US3242610A (en) Flexible connector for toy construction sets
US5310376A (en) Toy that can be assembled independently by a child
US2949692A (en) Construction toy
US3998004A (en) Geometric construction kit
US4003144A (en) Educational block with replaceable chip
US4722713A (en) Baby's toy and things to arouse attention therefor
US3667569A (en) Sound tube headset
US3220141A (en) Building blocks connectable in slideable or non-slideable relationship
US5769681A (en) Open-ended toy construction system
US3827177A (en) Construction game
US3205611A (en) Hollow blocks and tubular connecting means therefor
US3594940A (en) Assembly toy set
US3640018A (en) Knockdown structural toys
US4209934A (en) Modular toy building units
US4023245A (en) Hand-loom construction
US5895306A (en) Polygonal puzzle kit capable of three-dimensional construction, such as toy construction
US3310906A (en) Toy construction blocks and assembly
US5964635A (en) Toy construction system
US6893315B2 (en) Toy figure with a magnetized joint
US5281185A (en) Universal foldable toy blocks with alignable slots