GB2618306A - A fastener for a building system - Google Patents

A fastener for a building system Download PDF

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Publication number
GB2618306A
GB2618306A GB2202869.0A GB202202869A GB2618306A GB 2618306 A GB2618306 A GB 2618306A GB 202202869 A GB202202869 A GB 202202869A GB 2618306 A GB2618306 A GB 2618306A
Authority
GB
United Kingdom
Prior art keywords
cam
catch member
latch catch
fastener
casing
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.)
Pending
Application number
GB2202869.0A
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GB202202869D0 (en
Inventor
Eric Appleford David
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Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Priority to GB2202869.0A priority Critical patent/GB2618306A/en
Publication of GB202202869D0 publication Critical patent/GB202202869D0/en
Publication of GB2618306A publication Critical patent/GB2618306A/en
Pending legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38—Connections for building structures in general
    • E04B1/61—Connections for building structures in general of slab-shaped building elements with each other
    • E04B1/6108—Connections for building structures in general of slab-shaped building elements with each other the frontal surfaces of the slabs connected together
    • E04B1/612—Connections for building structures in general of slab-shaped building elements with each other the frontal surfaces of the slabs connected together by means between frontal surfaces
    • E04B1/6183—Connections for building structures in general of slab-shaped building elements with each other the frontal surfaces of the slabs connected together by means between frontal surfaces with rotatable locking means co-operating with a recess
    • 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
    • F16B12/10—Jointing of furniture or the like, e.g. hidden from exterior using pegs, bolts, tenons, clamps, clips, or the like
    • F16B12/28—Jointing of furniture or the like, e.g. hidden from exterior using pegs, bolts, tenons, clamps, clips, or the like for metal furniture parts
    • F16B12/36—Jointing of furniture or the like, e.g. hidden from exterior using pegs, bolts, tenons, clamps, clips, or the like for metal furniture parts using separate pins, dowels or the like
    • 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
    • F16B12/10—Jointing of furniture or the like, e.g. hidden from exterior using pegs, bolts, tenons, clamps, clips, or the like
    • F16B12/12—Jointing of furniture or the like, e.g. hidden from exterior using pegs, bolts, tenons, clamps, clips, or the like for non-metal furniture parts, e.g. made of wood, of plastics
    • F16B12/20—Jointing of furniture or the like, e.g. hidden from exterior using pegs, bolts, tenons, clamps, clips, or the like for non-metal furniture parts, e.g. made of wood, of plastics using clamps, clips, wedges, sliding bolts, or the like
    • F16B12/2009—Jointing of furniture or the like, e.g. hidden from exterior using pegs, bolts, tenons, clamps, clips, or the like for non-metal furniture parts, e.g. made of wood, of plastics using clamps, clips, wedges, sliding bolts, or the like actuated by rotary motion
    • F16B12/2027—Jointing of furniture or the like, e.g. hidden from exterior using pegs, bolts, tenons, clamps, clips, or the like for non-metal furniture parts, e.g. made of wood, of plastics using clamps, clips, wedges, sliding bolts, or the like actuated by rotary motion with rotating excenters or wedges

Abstract

The fastener 1 for a building system comprises a casing 2, a latch catch member 4, and a cam 3. The latch catch member has a circular aperture 39 and a catch portion 41, and the latch catch member is rotatable between a retracted position and an extended position. The cam is rotatably mounted to the casing, rotatable about a cam rotation axis 18 and has an eccentric disc 19 eccentrically positioned with respect to the cam rotation axis 18. The eccentric disc fits inside the circular aperture of the latch catch member to enable the latch catch member to be rotated by the cam between the retracted position and the extended position when the cam rotates as a result of engagement between the latch catch member and the eccentric disc. The cam has a tool receiving portion 34 to enable the cam to be rotated relative to the casing when a portion of a tool is received by the tool receiving portion 34 and rotated.

Description

A FASTENER FOR A BUILDING SYSTEM
The present invention relates to a fastener for a building system, and particularly, a fastener for a building panel for fastening the panel to another part of the building system.
US 3784240 discloses a panel fastener including a casing, a cam and a latch hook member. The casing comprises a pair of side walls which each have an inwardly extending boss wherein each boss receives a respective hub of the cam enabling the cam to rotate relative to the casing. The hubs are eccentrically positioned on a circular wall of the cam and the circular wall fits within a part circular aperture in the latch hook member. The cam has a wing extending from each side of the circular wall and the wings have a recess with a lug to which a flexed spring clip is attached. The spring clip engages an inside edge of the aperture in the latch hook member, and the circular wall of the cam is initially placed in the aperture of the latch hook member so that the clip can be received in the non-circular part of the aperture. The hubs of the cam have a through hole with a hexagonal shape for receiving a wrench for turning the cam to enable the latch hook member to engage a pin and pull the pin towards the casing of the panel fastener. Rotation of the cam is stopped by the wings of the cam engaging stops extending into the casing from the side walls of the casing, and there needs to be room between the casing side walls for the wings.
A problem with this panel fastener is that it is relatively complex to produce. The shape of at least some of its parts, particularly the cam, makes them difficult to machine or cast. Another problem is that the cam is liable to slip inside the aperture of the latch hook member when the cam is turned to lift the latch hook member from a position engaging the pin to a disengaged position. Yet another problem is that the latch hook member is relatively thin in relation to the distance between the casing side walls making it unsuitable for fastening large building panels. A further problem is that the wrench can bite into the through hole when the cam is rotated making it difficult to later remove the wrench from the panel fastener.
An object of the present invention is to provide a fastener for a building system which solves at least one of these problems.
To this end, the invention consists in a fastener for a building system comprising: a casing; a latch catch member having a circular aperture and a catch portion, the latch catch member being rotatable between a retracted position and an extended position; and a cam rotatably mounted to the casing, rotatable about a cam rotation axis and having an eccentric disc eccentrically positioned with respect to the cam rotation axis, the eccentric disc fitting inside the circular aperture of the latch catch member to enable the latch catch member to be rotated by the cam between the retracted position and the extended position when the cam rotates as a result of engagement between the latch catch member and the eccentric disc, the cam having a tool receiving portion to enable the cam to be rotated relative to the casing when a portion of a tool is received by the tool receiving portion and rotated.
The cam has a shape which makes it easy to machine or cast.
The latch catch member and the cam may be configured such that continued rotation of the cam in a first direction after the latch catch member has reached its extended position results in rotation of the cam relative to the latch catch member which acts to translate the latch catch member in a direction which is perpendicular to the cam rotation axis. The latch catch member may translate to a locking or clamping position. In the locking position, the latch catch member may be locked to a latch catch surface of another part of the building system.
The casing may have a stop or a first stop or a cam stop for the cam to engage. The cam stop may be engaged by the cam when the cam is rotating in the first direction after the latch catch member has reached its extended position. The cam stop may be engaged by the cam when the latch catch member has reached its locking position. The cam stop may extend from at least one of the first and second side walls of the casing towards the other of the first and second side walls of the casing. The cam stop may extend between the first and second side walls of the casing. The cam may be in an over-centred position when the cam engages the cam stop.
The cam may have a flange that extends to one side of the latch catch member and beyond the circular aperture. The flange may be circular and be of a larger diameter than the eccentric disc. The eccentric disc may extend substantially up to an outer edge of the flange. A central rotation axis of the flange may be coincident with the cam rotation axis.
The cam may have a first engagement portion The flange may have the first engagement portion. The first engagement portion may comprise a protrusion extending from an outer edge of the flange. The first engagement portion may be for engaging the cam stop of the casing. The latch catch member may have a second engagement portion for the first engagement portion to engage to cause the latch catch member to rotate from the extended position to the retracted position when the cam rotates, preferably in a second direction which may be opposite the first direction. This prevents the eccentric disc of the cam from slipping inside the circular aperture of the latch catch member when the latch catch member is retracted. The second engagement portion may comprise a protrusion extending parallel to the cam rotation axis from a side of the latch catch member.
The casing may comprise first and second side walls. The latch catch member and cam may be positioned or the latch catch member and the flange of the cam that extends to one side of the latch catch member and beyond the circular aperture may be positioned between the first and second side walls of the casing. Each of two opposed sides of the cam may include a circular or cylindrical hub which is journalled for rotation in a corresponding aperture in the casing or a respective said side wall of the casing. By the first and second side walls of the casing having only the latch catch member and the flange of the cam to fit between them, this enables the latch catch member to be relatively thick enabling it to be robust enough for use in a building panel. Thus, if the width between the casing side walls is the same as that for the casing side walls of the panel fastener of US 3784240, then the latch catch member can be thicker than the latch hook member of the panel fastener of US 3784240. The latch catch member and the flange of the cam may be fitted between the first and second casing walls so that there is friction between the latch catch member and the flange, between the latch catch member and one of the first and second casing walls and between the flange and the other of the first and second casing walls. This may enable the latch catch member to be held in the retracted position.
Each side wall of the casing may have a mounting flange comprising first and second portions, the mounting flange being folded so that second portion overlies the first portion with a gap between the first and second portions, and the second portion forming a mounting surface. This enables the fastener, 15 when mounted, to have some give when the latch catch member is rotated, particularly when the cam is moved to an over-centred position. This also prevents the tool biting into the tool receiving portion when the cam is rotated. The casing may have a stop or second stop or latch catch member stop for the latch catch member to engage when the latch catch member is in its retracted position. The latch catch member stop may extend between the first and second side walls of the casing. The latch catch member stop may extend from at least one of the first and second side walls of the casing towards the other of the first and second side walls of the casing.
The fastener may include a spring between the casing and the flange for urging the flange against the latch catch member. This may hold the latch catch member in the retracted position.
The tool receiving portion may comprise an axial slot extending at least partly through the cam. The orientation of the slot relative to the casing may indicate to a person using the building system whether the fastener has fully engaged or been locked or clamped to a latching surface of another part of the building system. The axial slot may have a cross shape in section.
Engagement of the circular aperture of the latch catch member and the eccentric disc may comprise friction between the latch catch member and the eccentric disc. By the fastener having friction between the latch catch member and the eccentric disc, no clip spring is required between the latch catch member and the cam.
Engagement of the circular aperture of the latch catch member and the eccentric disc may comprise a spring biased member of one of the latch catch member and the eccentric disc and a recess in the other of the latch catch member and the eccentric disc. This helps the latch catch member to be rotated by the cam between the retracted position and the extended position when the cam rotates. The spring biased member may have a curved surface for engaging the recess or be at least partly spherical. The recess may have a bowl, cap or hemi-spherical shape to receive the spring biased member.
An embodiment of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:-Figure 1 is a perspective view of a fastener for a building system in accordance with one embodiment of the invention; Figure 2 is an exploded view of the fastener; Figure 3 is an edge view of a cam of the fastener; Figure 4 is a face view of the cam; Figure 5 is an edge view of the cam opposite to that shown in Figure 3; Figure 6 is a face view of the cam opposite to that shown in Figure 4; Figure 7 is a perspective view of the cam; Figure 8 is a sectional view taken along lines 8-8 shown on Figure 4; Figure 9 is another perspective view of the cam from an opposite side to that shown in Figure 7; Figures 10 and 11 are perspective views of the fastener in part of a building panel of the building system engaging a part of an elongate member of the building system; Figure 12 and 13 is a plan view and a sectional view, respectively, of the fastener and parts of the building panel and elongate member with a latch catch member of the fastener in a retracted, unengaged position; Figure 14 and 15 is a plan view and a sectional view, respectively, of the fastener and parts of the building panel and elongate member with the latch catch member in an extended, partially engaged position; Figure 16 and 17 is a plan view and a sectional view, respectively, of the fastener and parts of the building panel and elongate member with the latch catch member in a fully engaged position and an eccentric disc of the cam being in an over-centred position; and Figure 18 is a more detailed view of Figure 17.
Referring to Figures 1 to 9 of the accompanying drawings, the fastener 1 for a building system comprises a casing 2, a cam 3, and a latch catch member 4.
The casing 2 comprises parallel first and second side walls 5, 6. A first tab 7 extends perpendicularly to the first side wall 5 from a first side edge of the first side wall 5 and a second tab 8 extends perpendicularly to the second side wall 6 from a first side edge of the second side walls 6. Each tab 7, 8 has an aperture 9 and the tabs 7, 8 overlap so that their apertures 9 are aligned. A fixing (not shown) is received in the apertures 9 to fix the first side wall 5 to the second side wall 6, the joined tabs 7, 8 forming a bridge between the first and second side walls 5, 6. A stop tab or an over-centre stop tab 10 extends from, and is perpendicular to, the second side wall 6 and extends towards the first side wall 5. The first side wall 5 has a first circular aperture 11 and the second side wall 6 has a second circular aperture 12 of the same diameter which is coaxially aligned with the first circular aperture 11. The second circular aperture 12 is above the stop tab 10. The first and second side walls 5, 6 have a second side edge opposite the first side edge, and each side wall 5, 6 has a mounting flange 13, 14 extending perpendicular to the side wall 5, 6 from the second side edge and away from the casing 2. Each mounting flange 13, 14 has a first portion 15 adjacent the second side edge and which extends away from the casing 2, and a second portion 16 folded back over the first portion 15 so that it overlies the first portion 15 with a gap 63 between the first and second portions 15, 16, the second portion 16 forming a mounting surface.
The cam 3 comprises a circular flange disc 17 which has a central axis 18 and an eccentric disc or crank or crankshaft 19 of a smaller diameter than the flange disc 17. The eccentric disc 19 is eccentrically positioned with respect to the central axis 18 on a first side 20 (see Fig. 3) of the flange disc 17. A point on a circumferential edge 21 (see Fig. 7) of the eccentric disc 19 almost touches or substantially reaches a point on a circumferential edge 22 of the flange disc 17. A bore 23 extends into the eccentric disc 19 from its circumferential edge 21. The bore 23 receives a ball 24 and spring 25 (see Fig. 2) wherein the spring 25 urges the ball 24 out of the bore 23. A first cylindrical hub 26 extends from the eccentric disc 19 and the longitudinal axis of the first hub 26 is coincident with the central axis 18 of the flange disc 17. A point on a circumferential edge 27 of the first cylindrical hub 26 almost touches or substantially reaches a point on the circumferential edge 21 of the eccentric disc 19. A second cylindrical hub 28 of the same diameter as first cylindrical hub 26 extends from a second side 29 of the flange disc 17 and is aligned with the first cylindrical hub 26. The first and second hubs 26, 28 are received in or journalled for rotation in the respective first and second apertures 11, 12 of the casing side walls 5, 6 so that the cam 3 is rotatable relative to the casing 2. The longitudinal axis of the hubs 26, 28 forms a cam rotation axis and the central axis 18 of the flange disc 17 is coincident with the cam rotation axis 18. An axial slot 30 (see Fig. 6) extends from an outer end face 31 of the first hub 26 to an outer end face 32 of the second hub 28 and a central longitudinal axis of the slot is coincident with the cam rotation axis 18. The slot 30 has rounded ends. The slot 30 intersects a bore 33 which also extends from the outer end face 31 of the first hub 26 to the outer end face 32 of the second hub 28. The bore 33 has a diameter larger than a width of the slot 30 and a central longitudinal axis of the bore 33 is also coincident with the cam rotation axis 8. The slot 30 and bore 33 form an aperture 34 for receiving a tool and the aperture 34 effectively has a cross-shape in section. The second side 29 of the flange disc 17 has an annular recess 35 which extends around the second hub 28. A bore 36 extends into the flange disc 17 from its circumferential edge 22. The bore 36 receives a pin 37 in a friction fit and the pin 37 extends radially outwards from the flange disc 17.
The latch catch member 4 has a circular base portion 38 (see Fig. 2) containing a central circular aperture 39. An arm 40 extends at a tangent to the circular base portion 38 and a distal end of the arm 40 has a hook or catch 41 bent towards the base portion 38. The circular aperture 39 receives the eccentric disc 19 of the cam 3 in a friction fit. The cam flange disc 17 is of a larger diameter than the circular aperture 39 of the latch catch member 4 and extends beyond the circular aperture 39. The circular aperture 39 has a recess 42 in its inside edge 43 which receives the spring biased ball 24 of the cam 3. The arm 40 has a hole 44 in which a pin 45 is mounted in a friction fit, the pin 45 extending away from a first side face 46 of the arm 40 and parallel to an axis of the circular aperture 39 which is coincident with a central axis 47 (see Fig. 6) of the cam eccentric disc 19 and which is parallel to the cam rotation axis 18. A washer spring 48 is received in the annular recess 35 in the cam flange disc 17 and engages an inside face 49 of the second side wall 6 of the casing 2 so as push the cam flange disc 17 against the first side face 46 of the latch catch member 4.
Referring to Figures 10 and 11, the fastener 1 is mounted inside a building panel 50 of the building system. The building panel 50 has a gap 51 and each mounting flange 13, 14 of the fastener 1 is mounted to the building panel 50 on either side of the gap 51 via a U-shaped plate 52 (see Figs. 2, 14 and 16) which has a gap 53 between its two arms 54 for the arm 40 of the latch catch member 4 to pass through. Each mounting flange 13, 14 has apertures 55 for receiving fixings (not shown) to fix the fastener 1 to the building panel 50. The apertures 55 align with apertures 56 (see Fig. 2) in the U-shaped plate 52.
The building panel 50 has an aperture 57 aligned with the tool receiving aperture 34 to enable a tool to operate the fastener 1 from outside the building panel 50. The building panel 50 is aligned with an elongate member or node 58 of the building system and a gap 59 in the elongate member 58 is aligned with the gap 51 in the building panel 50. The elongate member 58 has a latching surface 60 inside the gap 59 (see Fig. 10).
Operation of the fastener 1 will now be described with reference to Figures 12 to 18 in order to fasten the building panel 50 and the elongate member 58 together.
The latch catch member 4 is in a retracted position (see Fig. 13) wherein the arm 40 of the latch catch member 4 is against the bridge of the casing 2 formed by the tabs 7, 8 wherein the bridge forms a stop. The pin 37 extending radially from the cam flange disc 17 is adjacent the pin 45 extending axially from the latch catch member 4.
A tool (not shown) is inserted into the tool receiving aperture 34 and is rotated in a first direction to rotate the cam 3 in that direction about the cam rotation axis 18. Since the spring biased ball 24 of the cam 3 is received in the recess 42 in the latch catch member 4 and since there is friction between the circumferential edge 21 of the cam eccentric disc 19 and the inside edge 43 of the aperture 39 of the latch catch member 4, the latch catch member 4 also rotates in the first direction until its arm 40 engages the latching surface 60 of the elongate member 58, the latch catch member 4 now being in its extended position (see Fig. 15).
Continued rotation of the tool in the first direction results in rotation of the cam 3 relative to the latch catch member 4 as the ball 24 disengages from the recess 42 and is pushed into the bore 23 of the cam eccentric disc 19. The radial pin 37 of the cam 3 also moves away from the axial pin 45 of the latch catch member 4. Rotation of the eccentric disc 19 in the latch catch member aperture 39 translates the latch catch member 4 in a direction which is perpendicular to the cam rotation axis 18 so that the catch 41 engages the latching surface 60 locking the building panel 50 (see Figs. 10 and 11) and the elongate member 58 together, the latch catch member 4 now being in a locking or locked or clamping or clamped position (see Fig. 17). During this continued rotation to the locking position, the central axis 47 of the cam eccentric disc 19 moves so that it is aligned with the catch 47 and the latching surface 60 which the catch 47 engages (see Fig. 18) so that the catch 41 is pulled tightly against the latching surface 60 increasing interference 61 between the catch 41 and the latching surface 60 to a maximum extent. The interference 61 is then lessened as the cam eccentric disc 19 continues to rotate so that the cam eccentric disc 19 is over-centred 62 and the latch catch member 4 is in the locked position.
Continued rotation of the cam 3 is stopped by the radial pin 37 of the cam flange 17 engaging the stop tab 10 of the casing 2 with the cam 3 in an over-centred position.
The gap 63 between the first and second portions 15, 16 of the mounting flanges 13, 14 provides give as the interference 61 between the catch 41 and 20 the latching surface 60 reaches its maximum extent. The gap 63 would need to be greater than the interference 61 at its maximum extent.
To unlock the building panel 50 and the elongate member 58 the tool is rotated in the opposite second direction so that the catch 41 moves away from the latching surface 60 as the cam eccentric disc 19 rotates in the latch catch member aperture 39. Continued rotation of the tool causes the spring biased ball 24 of the cam 3 to be received in the latch catch member recess 42 as the recess 42 is moved past the bore 23 and for the radial pin 37 of the cam 3 to engage the axial pin 45 of the latch catch member 4. The tool is continued to be rotated in the second direction so that the radial pin 37 of the cam 3 engaging the axial pin 45 of the latch catch member 4 pushes the latch catch member arm away from the latching surface 60, and the latch catch member 4 is rotated with the cam 3 in the second direction until the latch catch member 4 engages the bridge formed by the tabs 7, 8 in the casing 2 Movement of the central axis 47 of the cam eccentric 19 during the fastening and unfastening of the building panel 50 and the elongate member 58 is shown by the dashed circle 64 on Figure 18.
Whilst a particular embodiment has been described, it will be understood that various modifications may be made without departing from the scope of the invention. The tool receiving aperture may be of any suitable shape in order to be operated by any suitable tool. The tool receiving aperture may be shaped to be operated by a conventional tool. For example, the tool receiving aperture may be shaped to receive the blade of a screwdriver or a shaft of an Allen key.

Claims (20)

  1. CLAIMS: 1.A fastener for a building system comprising: a casing; a latch catch member having a circular aperture and a catch portion, the latch catch member being rotatable between a retracted position and an extended position; and a cam rotatably mounted to the casing, rotatable about a cam rotation axis and having an eccentric disc eccentrically positioned with respect to the cam rotation axis, the eccentric disc fitting inside the circular aperture of the latch catch member to enable the latch catch member to be rotated by the cam between the retracted position and the extended position when the cam rotates as a result of engagement between the latch catch member and the eccentric disc, the cam having a tool receiving portion to enable the cam to be rotated relative to the casing when a portion of a tool is received by the tool receiving portion and rotated.
  2. 2. The fastener as claimed in claim 1, wherein the latch catch member and the cam are configured such that continued rotation of the cam in a first direction after the latch catch member has reached its extended position results in rotation of the cam relative to the latch catch member which acts to translate the latch catch member in a direction which is perpendicular to the cam rotation axis.
  3. 3. The fastener as claimed in claim 2, wherein the casing has a cam stop for the cam to engage when the cam is rotating in the first direction after the latch catch member has reached its extended position.
  4. 4. The fastener as claimed in claim 3, wherein the cam is in an over-centred position when the cam engages the cam stop.
  5. 5. The fastener as claimed in claim 3 or 4, wherein the cam has a first engagement portion for engaging the cam stop of the casing.
  6. 6. The fastener as claimed in claim 5, wherein the latch catch member has a second engagement portion for the first engagement portion to engage to cause the latch catch member to rotate from the extended position to the retracted position when the cam rotates in a second direction.
  7. 7. The fastener as claimed in claim 6, wherein the second engagement portion comprises a protrusion extending parallel to the cam rotation axis from a side of the latch catch member.
  8. 8. The fastener as claimed in any preceding claim, wherein the cam has a flange that extends to one side of the latch catch member and beyond the circular aperture.
  9. 9. The fastener as claimed in claim 8 when dependent on claims 5, 6 or 7, wherein the flange has the first engagement portion.
  10. 10. The fastener as claimed in claim 9, wherein the first engagement portion comprises a protrusion extending from an outer edge of the flange.
  11. 11. The fastener as claimed in claim 8, 9 or 10, wherein the flange is circular and is of a larger diameter than the eccentric disc.
  12. 12. The fastener as claimed in any one of claims 8 to 11, wherein a central rotation axis of the flange is coincident with the cam rotation axis.
  13. 13. The fastener as claimed in any one of claims 8 to 12, including a spring between the casing and the flange for urging the flange against the latch catch member.
  14. 14. The fastener as claimed in any preceding claim, wherein the casing comprises first and second side walls between which the latch catch member and cam are positioned.
  15. 15. The fastener as claimed in claim 14, wherein each side wall of the casing has a mounting flange comprising first and second portions, the mounting flange being folded so that second portion overlies the first portion with a gap between the first and second portions, and the second portion forming a mounting surface.
  16. 16. The fastener as claimed in any preceding claim, wherein each of two opposed sides of the cam includes a circular hub which is journalled for rotation in a corresponding aperture in the casing.
  17. 17. The fastener as claimed in any preceding claim, wherein the casing has a latch catch member stop for the latch catch member to engage when the latch catch member is in its retracted position.
  18. 18. The fastener as claimed in any preceding claim, wherein the tool receiving portion comprises an axial slot extending at least partly through the 25 cam.
  19. 19. The fastener as claimed in any preceding claim, wherein engagement of the circular aperture of the latch catch member and the eccentric disc comprises friction between the latch catch member and the eccentric disc.
  20. 20. The fastener as claimed in any preceding claim, wherein engagement of the circular aperture of the latch catch member and the eccentric disc comprises a spring biased member of one of the latch catch member and the eccentric disc and a recess in the other of the latch catch member and the eccentric disc. s
GB2202869.0A 2022-03-02 2022-03-02 A fastener for a building system Pending GB2618306A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2202869.0A GB2618306A (en) 2022-03-02 2022-03-02 A fastener for a building system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2202869.0A GB2618306A (en) 2022-03-02 2022-03-02 A fastener for a building system

Publications (2)

Publication Number Publication Date
GB202202869D0 GB202202869D0 (en) 2022-04-13
GB2618306A true GB2618306A (en) 2023-11-08

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GB2202869.0A Pending GB2618306A (en) 2022-03-02 2022-03-02 A fastener for a building system

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GB (1) GB2618306A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4930931A (en) * 1988-02-04 1990-06-05 Kabushiki Kaisha Kojima Shohten Instrument for assembling board-shaped bodies
US4938625A (en) * 1988-08-30 1990-07-03 Kabushiki Kaisha Kojima Shohten Assembling device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4930931A (en) * 1988-02-04 1990-06-05 Kabushiki Kaisha Kojima Shohten Instrument for assembling board-shaped bodies
US4938625A (en) * 1988-08-30 1990-07-03 Kabushiki Kaisha Kojima Shohten Assembling device

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Publication number Publication date
GB202202869D0 (en) 2022-04-13

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