EP0329483A1

EP0329483A1 - A tip up seat

Info

Publication number: EP0329483A1
Application number: EP89301605A
Authority: EP
Inventors: Owen Craggs; Alistair James Eden Taylor
Original assignee: Tubular Barriers Ltd
Current assignee: Tubular Barriers Ltd
Priority date: 1988-02-19
Filing date: 1989-02-20
Publication date: 1989-08-23
Also published as: GB8803878D0

Abstract

A tip-up seat includes a frame (100) comprising a first section (101) pivotally supporting a seat portion (138), a second section supporting a backrest portion (133), and stop (144,146) for limiting the pivotal movement of the seat portion from its tip-up position to an operative substantially horizontal position. The stop comprises a surface of the second section of which engages a part of the seat portion. The first section includes spaced apart arms (102) adjacent opposite edges of the seat portion for pivotally supporting the seat. The frame, seat portion and backrest portions may comprise hollow mouldings which fit together by means of spigotal connections.

Description

The invention relates to a tip-up seat and is particularly concerned with an improvement in a tip-up seat described in U.K. Patents GB-A-1556166 and GB-A-1556167.
In the accompanying drawings, Figs. 1 and 2 are the drawings from our GB-A-1556167 and the reader is directed to that Patent for a full description of the seat shown in Figs. 1 and 2.
The seats described in the above Patents have provided satisfactory in use but a considerable load is borne by a section 40 of the seat frame due to loading L on the seat when in use. The section 40 has to resist both downward load and load due to forward bending, as indicated by arrow B in Fig. 1, the pivotal movement of the seat into its operative substantially horizontal position being limited by stops 17 on the frame section 40 adjacent the pivot pin 18.
One object of the present invention is to provide a seat having improved load distribution.
According to one aspect of the invention there is provided a tip-up seat including a frame comprising a first section pivotally supporting a seat portion a second section supporting a backrest portion, and stop means for limiting the pivotal movement of the seat portion from its tip-up position to an operative substantially horizontal position, said stop means including a stop on part of the frame spaced from the first frame section.
The seat may be mounted on a seat supporting member for movement between a stowed position and an erect position on the supporting member. The supporting member may comprise part of a grandstand system and in the stowed position may stow beneath a floor on said part as in GB-A-1556166.
The frame may alternatively be rigidly secured to, say, part of a grandstand system in a permanently erected position.
With an arrangement according to said one aspect of the invention, the use of a stop on said part of the frame helps to reduce the bending load applied to the first frame section and, therefore, reduce the likelihood of fatigue occurring in that frame section.
Preferably the stop is on the second frame section. In such a case the seat portion may include a projection which co-operates with the stop.
Another stop may be arranged on the first frame section. The stops may be arranged on opposite sides of the seat pivot. In such a case, one of the stops may comprise a downwardly facing surface and the other an upwardly facing surface for co-operation with respective surfaces of the seat portion. The stop surfaces may be arranged in alternative configurations.
The first frame section may include two spaced-apart arms which pivotally support the seat portion therebetween. Such arms provide a stronger support for the seat portion than the single frame section 40 in Figs. 1 and 2.
Another object of the invention is to provide a strong support for the seat portion.
According to a second aspect of the invention there is provided a tip-up seat including a frame comprising a first section pivotally supporting a seat portion and a second section supporting a backrest portion said first section including two spaced-apart arms which pivotally support the seat portion therebetween.
Where the aforesaid projection is provided on the seat portion the projection may lie between the two arms when the seat portion occupies its tip-up position.
The seat portion may be biased normally into a tip-up position by resilient means.
The seat portion may carry a pre-formed seat, e.g., of plastics material.
The seat portion preferably co-operates with a stop or stops to limit pivotal movement thereof.
The seat portion and backrest portion may be arranged as described in our U.K. Patent No.1556167 so that the backrest portion forms substantially a continuation of an extension of the seat portion.
The frame according to any of the fourteen immediately preceding paragraphs may include a downwardly projecting leg which may be secured to a support element such as a runner.
The leg may be provided with a securing element by means of which it can be fixed, e.g., by a bolt or other fastener to a surface. The securing element may comprise an insert having a portion which locates in the leg and a portion which receives or otherwise co-operates with the fastener.
The frame may be formed with a fastener receiving recess spaced from the leg to facilitate fastening by means of, e.g., a bolt to a surface.
Where the frame is to be secured to said surfaces, the surfaces may be arranged at right angles to each other.
The frame may be moulded or otherwise formed from plastics material or metal/metal alloy with stiffening ribs thereon. The frame may be formed to ensure that the stiffening ribs are not visible when the seat frame is viewed from its front and/or rear.
For additional strength, the frame may include a plurality of legs.
According to a third aspect of the invention there is provided a tip-up seat including a frame comprising a first section pivotally supporting a seat portion, a second section supporting a backrest portion, and stop means for limiting the pivotal movement of the seat portion from its tip-up position to an operative substantially horizontal position, the stop means including a surface of the second section of the frame and the first section including spaced apart arms adjacent opposite edges of the seat portion for pivotally supporting the seat.
The use of the two adjacent arms and the stop means on the second section makes the seat particularly strong and bending loads are distributed better than in the seat described in GB-A-1556167.
Preferably the second section comprises two upwardly extending and spaced apart limbs interconnected by a transverse member which acts as a stop for the seat portion. Such an arrangement provides a stronger back to the seat than that described in GB-A-1556167 which also serves conveniently as the seat stop. Part of the seat portion may be arranged to extend between the two limbs when the seat occupies its operative position. This enables the length of said part to be increased to provide a relatively longer lever to one side of the pivot for co-operation with the stop.
The seat may be assembled easily by forming in the second section of the frame and the backrest portion so that they fit together by means of a spigot-like connection. Such interconnection preferably involves the second section and backrest portion having spaced apart spigot-like connections for additional strength and stability.
In order to support the frame on a surface or member, the frame may locate on a main support, e.g., by means of a spigot-like connection. The location may be strengthened by providing spaced apart spigot-like connections.
Preferably the frame is to be mountable on alternative types of main supports depending on the needs of the customer or the area in which the seat is to be fitted. In that respect the frame may include spaced apart sets of connections for mounting the frame on alternative types of main supports.
For simplicity of manufacture, the frame may be formed as a one-piece moulding in a suitable plastics material e.g., a nylon or polypropylene. In such a case the second section and backrest portion (which may also be formed as a one-piece moulding) preferably fit together by means of a spigot-like connection. The frame and main support (which may also be formed as a one-piece moulding) preferably fit together by means of a spigot-like connection.
According to a fourth aspect of the invention there is provided a tip-up seat including a moulded frame comprising a first section pivotally supporting a seat portion, a second section supporting a backrest portion, and a main support for the frame, at least one of the backrest portion and main support being located on the moulded frame by location means.
The latter arrangement provides an easy to assemble yet robust seat structure which is more versatile than those proposed in the aforesaid Patents.
Preferably both the backrest portion and main support locate on the frame.
Conveniently, the location means may comprise a spigotal interconnection.
Preferably the moulded frame is a hollow moulding defining a substantially tubular recess which receives a spigot on the backrest portion. Each recess may take the form of an elongate hollow tube defined between inner and outer walls of the moulding. The moulded frame portion may define similar recesses for one or more spigots on the main support.
In order to provide a good firm fit between the spigotally interconnected parts the spigots or recesses may have surface formations such as ribbing to provide a frictional grip. Such an arrangement avoids loosely interfitting parts. In addition, or alternatively, additional securing means such as a screw threaded fastener, locking pin etc may be used. The additional securing means may include a part (preferably a screw-threaded insert) which is moulded into part of the frame. Preferably said part provides an abutment surface for controlling a tip-up position of the seat portion.
Preferably two spaced apart sets of recesses are defined by the moulded frame one of which sets receives spigots of one type of main support and the other of which sets receives spigots of a different type of main support. Where the securing means is provided, it may be positioned between the two sets of recesses so that it can be utilised in securing any one of the alternative types of main support to the frame.
For efficient manufacture, the backrest portion may have a backrest moulding thereon which is actually moulded in position. Preferably the backrest portion includes members around which the moulding extends to retain the moulding on the backrest portion.
The seat of the present invention may be used in a stand construction system as described in our U.K. Patent No. 1556166.
A tip up seat in accordance with the invention will now be described by way of example with reference to the further accompanying drawings in which;-

Fig.3 is a perspective view of part of a demountable stand having five tip up seats thereon of a kind in accordance with the invention.
Fig.4 is a side view of the stand in Fig.3 showing a seat in an erected position and a stowed position,
Fig.5 is a side view of part of the seat shown in Fig.1 with the seat moulding and backrest moulding removed from their respective frames,
Fig.6 is a perspective view of the seat shown in Fig.5 with an alternative or additional stop,
Fig.7 is a perspective view of a part of an alternative form of seat, in accordance with the invention,
Fig.8 is a side view of the seat in Fig.7,
Figs.9 to 12 are perspective views of parts of other forms of seats,
Figs.13 to 15 are rear, side and front views respectively of another form of seat frame,
Fig.16 is a side view of a seat in accordance with the invention bolted to a surface,
Fig.18 is a front cross-sectional view of part of the front of the seat in Fig.17 showing an insert drawn to a larger scale, and
Fig.19 is a side view of a seat in accordance with the invention bolted to a cross beam.
Fig.20 is a perspective exploded view of a tip up seat in accordance with the invention shown partly broken away, a tipping seat plate being omitted for clarity,
Fig.21 is an elevation of the seat frame in Fig.20 shown partly broken away,
Figs.22 and 23 are cross sections of the frame on Fig.21 on lines XXII-XXII and XXIII-XXIII in Fig.21,
Fig.24 is an underneath plan view of the seat frame shown in Fig.21,
Fig.26 is an elevation of a main support leg for the frame of Fig.21,
Fig.27 is an end view of the support leg of Fig.26,
Fig.28 is an elevation of a main support bracket for attachment to a vertical surface,
Fig.29 is an end view of the bracket of Fig.28,
Fig.30 is an elevation of a backrest portion,
Fig.31 is a cross section of the backrest portion in Fig.30 on line XXXI in Fig.31,
Fig.32 is a plan view of a main support base plate,
Fig.33 is a cross section of the base plate in Fig.32 on the line XXXIII-XXXIII in Fig.32,
Fig.34 is an end view of the tip up seat with the seat plate in position,
Fig.35 is an elevation of the tip-up seat of Fig.34,
Fig.36 and 37 are end and front views of the tip up seat on a main support bracket as shown in Fig.28 and 29,
Figs.38 and 39 are end and front views of the tip up seat on a main support base plate as shown in Figs.32 and 33, and
Figs.40 and 41 are end and front views of the tip up seat on a main support base plate as shown in Figs.32 and 33 with the base plate on and supported by brackets from a vertical surface.

In Fig.3 there is shown part of a stand system as described in UK Patent No.1556166 having a row of seats 50 in accordance with the invention which can be arranged in an erect position as in Fig.3 or in a stowed position as shown in Fig.4. The erection and stowing is substantially as described in detail in the present application. Each seat comprises a leg 52 secured to a runner 53, body section 54, a first frame section comprising two arms 55, a seat portion 56 pivotally supported in mounting bosses 57 at the upper ends arms and a second frame section 58 extending from the rear of the body section 54 for supporting a backrest moulding 59. The second frame section 58 comprises two limbs 45 similar to those shown in Figs.7 and 9 which are interconnected at the upper ends by a web 51. The seat portion 58 comprises a plate 60 to which is attached a seat moulding 61. The seat moulding 61 has a rearward extension 62 which is received within a complementary shaped recess (not shown) in the backrest moulding 52 substantially as described in U.K. Patent No.1556167.
As shown in Figs.3 and 5 the plate 60 has a rearward projection in the form of a tongue 63 which engages beneath a stop member 64 extending between the two limbs 45 when the plate is in the operative horizontal position shown in Fig.5. The stop member 64 may instead be formed by the lower edge of a deeper web 51. The arms 55 may alternatively or additionally be formed with stop members 65 for a resisting downward flexing of the plate 60 when a load is applied to the seat during use. The stop members 65 can be seen in detail in Fig.6.
Figs.7 and 8 illustrate a seat frame in which the seat plate 60 is moulded to form a hollow element which tapers from its pivotal centre area 66 towards the front and rear as shown clearly in Fig.8. The mounting bosses 57 on the arms 55 locate in recesses 67 formed during moulding. If desired an area 68 may be provided for receiving advertising or Trade mark matter (such as the letters TB shown in Fig.3). The seat plate is formed with surfaces 67a in the recesses which engage stop members 55 on the arms in the operative position. The tongue 63 of the seat plate also engages beneath the stop member 64. Shelf 65a could be provided as in Fig.6 with a section of tongue 63 removed to clear the shelf.
In Fig.9 the single leg 52 is replaced by two spaced legs 152. A rearward projecting tongue 68 does not, in this case, co-operate with a stop, the plate simply engaging stop members 65 on the arms or a shelf 65 as in Fig.6. However, the projecting tongue may be extended to locate beneath a stop member on the second frame section 58 if desired.
Fig.10 shows a seat frame of similar shape to that shown in Fig.9 which is formed e.g., by moulding, casting or fabricating from a suitable material such as plastics, or metals or aluminium alloys. The moulding is basically hollow with integral criss-cross ribs 69 formed thereon. The seat plate is omitted in Fig.10. Stops such as stops 65 or shelf 65a as in Fig.6 can be provided in this embodiment and that of Fig.11.
Fig.11 shows a version of the seat frame of Fig.10 with a single leg 252. The hollow moulding is closable over its front face by means of a cover 70 which may be a snap-fit on to the frame. If desired the seats 50 of Fig.1 may have a frame as shown in Fig.12 where the body section 54 has a strengthening cross member 72 to which a second frame section 58 is moulded. Stop members 65 such as stop members 65 in Fig.9 or shelf 65a as in Fig.6 may be provided on the arms 55 and/or a stop member may be provided on the single limb 145 of the second frame section 58. Where a stop member (not shown) is provided on the limb 145 it can take the form of a projection engageable with a tongue of a seat plate (not shown) which pivots on the frame.
Figs.13 to 15 show a version of the seat frame which is moulded from a suitable plastics such as nylon. The single leg 52, arms 55 and second frame section 58 are hollow with integral elongate stiffening ribs 73. The stops for the seat plate (not shown) are formed by surfaces 74 on the arms 55 and by the underside 75 or a leg 76.
The seat plate 60 is connected to the seat frame by a pivot which may comprise a pivot pin inserted through the bosses 57 and one or more bores in the seat plate. Alternatively the pivot may comprise projections on the bosses or seat plate locatable in suitable sockets in the seat plate or bosses respectively.
Instead of forming the leg 52 and arms 55 so that the stiffening ribs 73 remain visible from front and rear it is proposed to form the seat frame in a box-like manner with front and rear surfaces F, R and with the ribs 73 hidden within the box. A cross-section of the leg 52 formed in that way is shown in Fig.16. the seat of Figs.13 to 15 may incorporate stops 65 or a shelf 65a as in Fig.6.
In Figs.17 and 18, the seat frame is bolted to surfaces 80, 82 formed at the corner of a concrete step. The leg 52 is hollow and is formed with an opening 83 at its lower end which receives an insert 84. The insert 84 comprises a plate 86 integral with a projection 87 which spigotally locates in the opening 83 as shown clearly in Fig.18. The plate 84 is formed with apertures 88 which receive bolts 89. The frame is also formed with a vertical hole 90 which receives a bolt 92. The bolts 89 and 92 secure the seat frame to the surfaces 80, 82. Provided that the leg 52 or each of the legs 52 is hollow, any of the seat frames shown in Figs.5 to 16 can be mounted in this way.
In Fig.19 the seat frame is secured to a beam 93 which may be suitably supported from the ground or from the sides of risers (not shown). The leg 52 in this case is bolted directly to the beam 93 by a bolt 94 rather than through an insert. The frame is formed with the vertical hole 90 as in Fig.17 for receiving a bolt 95 for additional fastening to the beam 93. Such a form of mounting can be used for any of the seats described in Figs.5 to 16.
With the various seat frame arrangements shown in Figs.5 to 19 the seat plate may be biased into a tip-up position by a return spring or other resilient mechanism not shown.
Referring now to Fig.20 the tip-up seat comprises a frame 100 formed as a one-piece hollow moulding having a first section 101 comprising spaced apart arms 102 formed with co-axial bores 103 at their upper ends, and a second section104 comprising two upwardly extending and spaced apart limbs 105. The limbs 105 are interconnected by a integral web 106 and downwardly extending flange 106a.
The arms 102 are hollow and the moulding includes internal walls 107, 108 which together with the outer walls of the limbs form two spaced apart tubes.
The frame 100 is also formed with internal walls 109, 110 and 112 which with the outer walls of the frame 100 define two spaced apart tubes 113 for reasons explained below.
The limbs 105 and web 106 are also hollow and define upwardly extending tubes 115.
The first section 101 has a central abutment 100a formed with an inclined surface 100b. A screw-threaded insert 116 is moulded into the abutment 100a. The screw-threaded insert 116 can receive a locating pin 117 (Fig.34) having a screw-threaded upper shank 118, a straight lower shank 119 and an intermediate annular flange 120 disposed therebetween.
A leg 122 is formed as a one-piece moulding comprising an elongate downwardly projecting section 123 integral at its upper end with spaced apart rectangular cross-section spigots 124. The spigots 124 have external ribbing 125 and can be located in the respective tubes 111 as shown in Fig.34. The ribbing 125 forms a tight grip against the walls of the tubes 111. A shoulder 122a is formed along front and side edges of the leg 122.
The lower end of the downwardly projecting section 123 is angled at 123a and formed with a bore 123b for receiving a runner 53 as shown in Fig.4. The leg 123 has a rearwardly extending flange 123c formed with a bore 123d which aligns with the insert 116. A bolt B (shown in part in Fig.20) passes through the bore 123d and screws into the insert 116 to secure the leg 123 to the frame 100. The leg 123 arrangement enables the arrangement of Fig.20 to be used somewhat like the seat shown in Fig.4 i.e. folded and stowed beneath the flooring of a grandstand system. The shoulder 122a abuts the adjacent lower edges of the first section 101.
As an alternative to using the leg 122 which enables the seat to be folded and stowed, the frame 100 can be located on a mounting bracket 126 (shown also in Figs.28 and 29) which can be fastened to a vertical surface 127 such as a riser as in Figs.36 and 37 by means of bolts 127a locatable in holes 128. The mounting bracket 126 is formed as a one-piece moulding and comprises a vertical plate 129, a horizontal plate 130 a box-like stiffening web 131 and two upwardly extending rectangular cross-section spigots 132. The spigots 132 have external ribbing 133 and locate as a tight friction fit in tubes 113. The horizontal plate 130 supports the base of the frame 100 forwardly of the spigots 132 and is formed with a bore 130a, which aligns with the insert 116. The bolt B passes through the bore 130a and screws into the insert 116 to secure the mounting bracket 126 to the frame 100. The bore 130a is assembled through an open rear R of the mounting bracket.
A backrest portion 133 (see also Figs.30 and 31) is formed as a open fronted hollow moulding and has integral downwardly projecting spigots 134 having external ribbing 135. The spigots 134 fit into tubes 115, the ribbing 135 being a tight friction fit within the tubes. The moulding includes criss-cross webbing 133a and a peripheral bead 133b. Each spigot has one outer face formed with a bore 134a which aligns with a bore 105a in each limb 105. The aligned bores 105a, 134a receive retaining pins P to lock the backrest portion 133 to the frame 100.
In order to enable the frame 100 to be attached to a horizontal surface, e.g., the top of a step 200 (Fig.38), a base plate 155 is provided as shown in Fig.32 and 33 can be used. The base plate comprises a one-piece moulding having a plate section 156 formed with integral upwardly extending spigots 157. The spigots 157 are formed with ribbing 158 and locate as a tight friction fit in the tubes 115 in the frame 100 with a central bore 158 in alignment with the insert 116. The base plate can then be retained on the underside of the frame 100 by means of the bolt B passing through the bore 158 and screwed into the insert 116. The plate section 156 is formed with spaced apart fixing holes 159 by which it can be secured by means of bolts 201 or the like to the top of step 200.
A seat-plate 138 (shown in vertical position in full lines in Fig.34) is substantially T-shaped in under plan (as viewed in Fig.35) and comprises spaced apart parallel hollow bars 139 formed integrally with pivot section 140 through which a pivot bar 141 passes to permit pivotal movement of the seat between the arms 102, a tongue 142 and a cross member 143 at the opposite ends of the bars. the pivot bar 141 passes through the bores 103 in the arms 102 and is suitably retained in position by means (not shown).
The seat plate 138 is movable from an operative horizontal position shown in broken lines in Fig.34 to a tip up position shown in full lines in Fig.34.
The tongue 142 is formed with a recess 144 which receives a substantially complementary shaped projection 146 formed along the lower edge of the web 106 of the frame 100. The projection 146 provides the stop means to prevent the seat plate 138 moving beyond its operative position. The tongue 142 abuts the surface 100b of abutment 100a when in the substantially vertical tip-up position. That arrangement ensures that the tipped seats in a multi-seat system will all occupy the same tip-up position thereby presenting a tidy appearance.
As shown in Fig.34, both the backrest portion 133 and the seat plate 138 are connected, in use, to mouldings 147, 148 to form a comfortable backrest and seat for the user. The backrest and seat are shown in broken lines in Fig.30 and it will be noted that the backrest 147 and seat 148 mouldings have complementary adjacent surfaces 147a and 148a to form a smooth transition between the seat 148 and the backrest 147.
The seat plate 138 is preferably normally biassed into the tip-up position by means of a torsion spring acting between suitable formations (not shown) on the inside surfaces of the arms 102 and a surface of the seat plate. Alternatively, the tongue 142 of the seat plate can be weighted to bias the seat plate towards its tip-up position.
The fixing of the backrest moulding 147 to the backrest portion 133 may conveniently be effected by blow moulding the backrest directly onto the backrest portion. In that way, the bead 133b along the edge of the backrest portion 133 and the webbing 133a will be substantially encapsulated within the blow moulding. The assembled backrest moulding 147 and backrest portion 133 can then be spigotally connected to the main frame 100. The seat moulding 148 locates around the seat plate 138 which is conveniently a hollow moulding. One or more fixing screws (not shown) may be used from beneath to secure the seat moulding to the seat plate. The supper surface of the seat moulding extends across the upper ends of the arms 102 in a manner similar to that shown in Fig.3.
Where the seating includes the leg 122, the seat is held in its erect position as shown in Fig.30 by locating the shank 119 of the peg 117 in a bore formed in the floor of a grandstand system as described in our U.K. Patent No.1556166.
If desired, the base plate 155 can be mounted on an elongate support 210 as shown in Figs.40 and 41. The elongate support is mounted on spaced apart brackets 211 bolted to a vertical riser 212.
The use of moulded parts which are spigotally interconnectable as described makes the seat particularly easy to manufacture and makes the system particularly versatile for fitting to a runner enabling the seat to be stowed under a floor F of a grandstand or secured to a riser or a flat surface. Also, the individual items can be made light in weight from a suitable plastics material making them particularly easy to transport, to handle and weather resistant.

Claims

1. A tip-up seat including a frame comprising a first section pivotally supporting a seat portion, a second section supporting a backrest portion, and stop means for limiting the pivotal movement of the seat portion from its tip-up position to an operative substantially horizontal position, the stop means including a surface of the second section of the frame and the first section including spaced apart arms adjacent opposite edges of the seat portion for pivotally supporting the seat.

2. A tip-up seat according to Claim 1 in which the second section comprises two upwardly extending and spaced apart limbs interconnected by a transverse member which acts as a stop for the seat portion.

3. A tip-up seat according to Claim 2 in which a part of said seat portion is arranged to extend between the two limbs when the seat occupies its operative position.

4. A tip-up seat according to any preceding Claim in which the second section of the frame and the backrest portion fit together by means of a spigot-like connection.

5. A tip-up seat according to Claim 4 in which the second section and backrest portion include spaced apart spigot-like connections.

6. A tip-up seat according to any preceding Claim in which the frame locates on a main support by means of a spigot-like connection.

7. A tip-up seat according to Claim 6 in which the main support and the frame include spaced apart spigot-like connections.

8. A tip-up seat according to Claim 6 or 7 in which the frame includes two spaced apart spigot-like connections for mounting the frame on alternative types of main supports.

9. A tip-up seat according to any preceding Claim in which the frame is formed as a one-piece moulding.

10. A tip-up seat according to Claim 9 and where the second section and backrest portion fit together by means of a spigot-like connection, in which the backrest portion is formed as a moulding, the spigotal interconnection being provided by a spigot on one of the second member and backrest and a hollow moulded recess on the other.

11. A tip-up seat according to any preceding Claim and where the frame locates on a main support by means of a spigot-like connection, in which the main support is a substantially hollow moulding, the spigotal interconnection on one of the frame and main support locating in a hollow moulded recess in the other.

12. A tip-up seat according to any of preceding Claim in which the backrest portion has a backrest moulding moulded thereon, the backrest portion including members around which the moulding extends to retain the moulding on the backrest portion.