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A modular folding seat for use in vehicles is provided. The seat includes a base securable to the vehicle; a backrest pivotally connected to the base, and can include a removable backrest panel mounted to the backrest. The base or the backrest includes a pair of outwardly extending bosses disposed o

A modular folding seat for use in vehicles is provided. The seat includes a base securable to the vehicle; a backrest pivotally connected to the base, and can include a removable backrest panel mounted to the backrest. The base or the backrest includes a pair of outwardly extending bosses disposed on opposite sides that are rotatably engageable within recesses disposed in the other one of the base or backrest. The bosses are held within the recesses by a pair of engagement members disposed adjacent or in each recess. The engagement members are capable of being deflected to a non-securing position whereby the bosses can be inserted into or withdrawn from the recesses to assemble or disengage the backrest to or from the base. A plurality of regions of engagement between the base and backrest keep the backrest from over rotating beyond a fully upright position and resist downward folding of the backrest when in the upright position. Another engagement region can be provided to park the backrest in a downwardly folded position.

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It is claimed: 1. A foldable seat comprising: a base that underlies a seat occupant supporting surface; a backrest; a snap-fit pivot arrangement attaching the backrest to the base such that the backrest is pivotable between a generally upright position and a folded position disposed from the genera

It is claimed: 1. A foldable seat comprising: a base that underlies a seat occupant supporting surface; a backrest; a snap-fit pivot arrangement attaching the backrest to the base such that the backrest is pivotable between a generally upright position and a folded position disposed from the generally upright position; a detent arrangement formed of the base and the backrest that is disposed within the seat when the backrest is located in the generally upright position with the detent arrangement including a first interference stop that prevents pivotable movement of the backrest when in the generally upright position away from the generally upright position and away from the folded position and a second interference stop adjacent the first interference stop that releasably retains the backrest in the generally upright position by opposing pivotable movement of the backrest toward the folded position when in the generally upright position but permitting pivotable movement of the backrest toward the folded position with application of manual force; and wherein the snap-fit pivot arrangement is comprised of a ball formed of one of the backrest and the base that is pivotably received in a socket formed in the other one of the backrest and the base defining a plurality of interiorly hidden pivot joints therebetween. 2. The foldable seat of claim 1 wherein each pivot joint comprises a pivot pin integrally formed in one of the ball and the socket, a pivot pin receiver integrally formed in the other one of the ball and the socket, and a releasable pivot pin retainer disposed in the pivot pin receiver. 3. The foldable seat of claim 2 wherein the ball is integrally formed from a lumbar-supporting portion of the base that extends upwardly rearwardly of a seat occupant and the backrest comprises a pair of generally parallel and integrally formed downwardly extending arms defining the socket therebetween and wherein one of the pivot pins extends outwardly from one side of the ball into one of the pivot pin receivers formed in one of the backrest arms and the other one of the pivot pins extends outwardly from an opposite side of the ball into the other one of the pivot pin receiver formed in the other one of the backrest arms. 4. The foldable seat of claim 1 wherein the detent arrangement comprises a detent notch formed in an end wall of one of the base and the backrest and a rib formed in an end wall of the other one of the base and the backrest that is releasably received in the detent notch when the backrest is disposed in the generally upright position. 5. The foldable seat of claim 4 wherein the detent notch is defined by a pocket having a rear edge that serves as the first interference stop that opposes pivoting of the backrest away from the folded position rearwardly beyond the generally upright position and a front edge spaced from the rear edge that serves as the second interference stop that opposes pivoting of the backrest toward the folded position releasably retaining the backrest in the generally upright position when the rib is received in the detent notch. 6. The foldable seat of claim 1 further comprising a backrest rotation limiter formed by a region of camming or wedging engagement between the base and the backrest that prevents pivotable movement of the backrest. 7. The foldable seat of claim 1 wherein both the base and the backrest have opposed curved end walls that cam or wedge against one another when the backrest is urged rearwardly away from the generally upright position opposing rearward backrest rotation beyond the generally upright position. 8. A foldable seat comprising: a base that underlies a seat occupant supporting surface; a backrest; a snap-fit pivot arrangement attaching the backrest to the base such that the backrest is pivotable between a generally upright position and a folded position disposed from the generally upright position; a detent arrangement formed of the base and the backrest that is disposed within the seat when the backrest is located in the generally upright position with the detent arrangement comprised of a pair of spaced apart stops of one of the base and backrest that cooperates with the other one of the base and backrest releasably retaining the backrest in the generally upright position while permitting the backrest to be moved toward the folded position upon application of manual force; and wherein the snap-fit pivot arrangement comprises a ball that is integrally formed of part of one of the base and the backrest and a socket that is integrally formed in part of the other one of the base and the backrest that receives the ball. 9. The foldable seat of claim 8 further comprising a backrest parking detent arrangement integrally formed between the base and backrest that releasably retains the backrest in the folded position opposing rearward pivoting of the backrest toward the generally upright position. 10. The foldable seat of claim 9 further comprising a backrest rotation limiting arrangement comprised of camming or wedging engagement between the base and the backrest that limits rearward pivoting of the backrest when the backrest is disposed in the generally upright position. 11. The foldable seat of claim 8 wherein the snap-fit pivot arrangement defined by the ball and socket is of concealed or hidden construction. 12. A foldable seat comprising: a base that underlies a seat occupant supporting surface; a backrest; a snap-fit pivot arrangement attaching the backrest to the base such that the backrest is pivotable between a generally upright position and a folded position disposed from the generally upright position; a detent arrangement formed of the base and the backrest that is disposed within the seat when the backrest is located in the generally upright position with the detent arrangement comprised of a pair of spaced apart stops of one of the base and backrest that cooperates with the other one of the base and backrest releasably retaining the backrest in the generally upright position while permitting the backrest to be moved toward the folded position upon application of manual force; and wherein one of the base and the backrest comprises a pair of generally spaced apart arms that engage the other one of the base and the backrest with the snap-fit pivot arrangement comprising a pair of snap-fit pivot joints having one of the snap-fit pivot joints formed where one of the arms engage the other one of the base and the backrest and the other one of the snap-fit pivot joints formed where the other one of the arms engage the other one of the base and the backrest. 13. The foldable seat of claim 12 wherein the one of the base and the backrest comprises a first wall disposed between the pair of arms and the other one of the base and the backrest comprises a second wall that opposes the first wall and wherein the detent arrangement is formed by engagement between the first and second walls and interiorly disposed therebetween so as to be hidden when the backrest is disposed in the generally upright position. 14. The foldable seat of claim 13 wherein the first and second walls are complementarily curved and spaced such that rotation of the backrest rearwardly away from the generally upright position away from the folded position causes engagement between the first and second walls to oppose further rearward backrest rotation beyond the generally upright position. 15. The foldable seat of claim 13 further comprising a backrest parking detent arrangement comprised of an upraised first rib of the first wall that engages an upraised rib of the second wall when the backrest is disposed in the folded position releasably retaining the backrest in the folded position. 16. A foldable seat comprising: a base that underlies a seat occupant supporting surface; a backrest; a snap-fit pivot arrangement attaching the backrest to the base such that the backrest is pivotable between a generally upright position and a folded position disposed from the generally upright position; a detent arrangement formed of the base and the backrest that is disposed within the seat when the backrest is located in the generally upright position with the detent arrangement comprised of a pair of spaced apart stops of one of the base and backrest that cooperates with the other one of the base and backrest releasably retaining the backrest in the generally upright position while permitting the backrest to be moved toward the folded position upon application of manual force; and wherein the snap-fit pivot arrangement comprises a pivot that is releasably captured in a pivot receptacle by a retainer disposed in the pivot receptacle. 17. The foldable seat of claim 16 wherein the pivot and pivot receptacle are not exteriorly visible when the pivot is received in the pivot receptacle and wherein the retainer comprises a flexible upraised finger. 18. The foldable seat of claim 16 wherein the pivot comprises a generally cylindrical boss that is cantilevered and integrally formed of one of the backrest and the base and the pivot receptacle comprises a recess integrally formed in the other one of the backrest and the base that has a mouth through which the boss is inserted during assembly that is spaced from a recess end wall with the retainer being disposed in the recess adjacent the mouth and spaced from the recess end wall. 19. A foldable seat comprising: a base that provides a seat occupant supporting surface; a backrest; a snap-fit pivot arrangement attaching the backrest to the base such that the backrest is pivotable between a generally upright position and a folded position with the snap-fit pivot arrangement comprising a pivot that is releasably retained in a pivot receptacle by a retainer wherein the pivot is cantilevered and integrally formed of one of the backrest and the base; wherein the pivot receptacle comprises a recess integrally formed in the other one of the backrest and the base; and wherein the retainer is flexible, extends outwardly from the other one of the backrest and the base, and is located such that it opposes movement of the pivot relative to the pivot receptacle toward the retainer and in a direction generally transverse to an axis about which the pivot is rotatable. 20. The foldable seat of claim 19 wherein the pivot receptacle has a mouth through which the pivot enters during assembly and the retainer is disposed adjacent and in line therewith. 21. The foldable seat of claim 20 wherein the retainer comprises a finger that is attached to the other one of the backrest and the base. 22. The foldable seat of claim 19 wherein the base and backrest are molded of plastic with the pivot comprising a boss integrally molded as part of the base and the backrest and the pivot receptacle comprising an oblong channel integrally molded into the other one of the backrest and the base. 23. A foldable seat comprising: a seat base; a backrest; an interiorly disposed pivot arrangement that permits the backrest to pivot relative to the base; wherein one of the base and the backrest comprises a pair of spaced apart arms and receive a part of the other one of the base and the backrest therebetween; wherein the pivot arrangement comprises a pair of spaced apart pivot joints with one pivot joint disposed between one of the arms and an adjacent part of the other one of the base and backrest received between the arms and the other pivot joint disposed between the other one of the arms and an adjacent part of the other one of the base and backrest received between the arms; wherein each arm has an inboard sidewall and the part of the other one of the base and the backrest received between the arms has a pair of outboard sidewalls, and wherein each pivot joint is comprised of a boss that cantilevers outwardly from a respective one of the inboard and outboard sidewalls and is received in a receiver formed in the respective other one of the inboard and outboard sidewalls; and wherein each receiver comprises a pocket that has a mouth through which a respective boss is inserted during assembly and a retainer disposed adjacent the mouth of the pocket that releasably retains the boss in the pocket when inserted therein. 24. A foldable seat comprising: a seat base; a backrest; a pivot arrangement formed where the backrest engages the base permitting the backrest to pivot relative to the base with the pivot arrangement comprising a plurality of pivot joints each of which comprises a pivot pin that extends outwardly from one of the seat base and backrest and a pivot pin receiver formed in the other one of the seat base and backrest; and wherein each pivot pin receiver comprises a pocket that has a mouth through which a respective pivot pin is inserted during assembly and a flexible retainer disposed adjacent the mouth of the pocket that flexes to permit insertion of the pivot pin into the pocket and thereafter opposes removal of the pivot pin from the pocket. 25. The foldable seat of claim 24 wherein backrest is pivotable relative to the base between a fully upright position and a folded position where the backrest overlies the base with the backrest and base each comprising an end wall engagable with one another (a) along a first region of engagement between the end walls when the backrest is disposed in the fully upright position releasably retaining the backrest in the fully upright position and (b) along a second region of engagement between the end walls when the backrest is disposed in the folded position releasably retaining the backrest in the folded position. 26. The foldable seat of claim 25 wherein the first region of engagement between the end walls that releasably retains the backrest in the fully upright position comprises a first detent arrangement integrally formed of a plurality of inter-engaging upraised sections of the end walls and the second region of engagement between the end walls that releasably retains the backrest in the folded position comprises a second detent arrangement integrally formed of a plurality of inter-engaging upraised sections of the end walls. 27. A foldable seat comprising: a seat base; a backrest; a pivot arrangement formed where the backrest engages the base permitting the backrest to pivot relative to the base with the pivot arrangement comprising a plurality of pivot joints each of which comprises a pivot pin that extends outwardly from one of the seat base and backrest and a pivot pin receiver formed in the other one of the seat base and backrest; and wherein each pivot pin receiver comprises a pocket that has a mouth through which a respective pivot pin is inserted during assembly and a flexible retainer disposed adjacent the mouth of the pocket that flexes to permit insertion of the pivot pin into the pocket and thereafter opposes removal of the pivot pin from the pocket; wherein the backrest is pivotable relative to the base between a fully upright position and a folded position where the backrest overlies the base with the backrest and base each comprising an end wall engagable with one another (a) along a first region of engagement between the end walls when the backrest is disposed in the fully upright position releasably retaining the backrest in the fully upright position and (b) along a second region of engagement between the end walls when the backrest is disposed in the folded position releasably retaining the backrest in the folded position; wherein the first region of engagement between the end walls that releasably retains the backrest in the fully upright position comprises a first detent arrangement integrally formed of a plurality of inter-engaging upraised sections of the end walls and the second region of engagement between the end walls that releasably retains the backrest in the folded position comprises a second detent arrangement integrally formed of a plurality of inter-engaging upraised sections of the end walls; and wherein each detent arrangement comprises a pawl that extends outwardly from one of the end walls that releasably cooperates with a detent receiver formed in the other one of the end walls to releasably retain the backrest in its corresponding fully upright or folded position and wherein each pivot pin comprises a generally cylindrical boss that has a generally circular cross section integrally formed of part of one of the base and the backrest and each pivot pin receiver pocket is integrally formed in the other one of the base and the backrest. 28. A foldable seat comprising: a seat base that comprises a seat occupant supporting surface; a backrest that cooperates with the seat base; a pivot arrangement comprised of a pair of spaced apart pivot joints that enable the backrest to pivot relative to the seat base between a generally upright position and a folded position disposed away from the generally upright position; a first detent arrangement comprised of a first region of engagement between the seat base and backrest opposing rearward backrest rotation beyond the generally upright position away from the folded position and a second region of engagement between the seat base and backrest releasably retaining the backrest in the generally upright position when the backrest is disposed in the generally upright position; a second detent arrangement comprised of a third region of engagement between the seat base and backrest releasably retaining the backrest in the folded position when disposed in the folded position; and a backrest rotation limiter comprised of a first wall of the seat base in opposition to a second wall of the backrest and spaced relative thereto such that rotation of the backrest rearwardly beyond the generally upright position causes interfering engagement between the first and second walls opposing rearward backrest rotation.