Abstract:
A two piece retractable hard-top roof for interfacing with an automobile body assembly, the retractable hard-top roof having a forward roof component and a rearward roof component, wherein an actuation mechanism and its associated framework are not located in the passenger compartment, being generally located in a stowage compartment, and wherein a minimal fore-aft dimension is needed to accommodate storage of the retractable hard-top roof. A front end of the forward roof component is selectively affixable to the windshield trim. The rearward roof component includes a rear window, is affixed at its rear end to the actuation mechanism, and is selectively conjoined at its front end to the rear end of the forward roof component to provide a single, rigid unit. In a retraction operation, the conjoined roof retracts to a first selected location, whereupon the forward roof component is detached from the rearward roof component and theafter seated inside the stowage compartment whereat the forward roof component is juxtaposed the rearward roof component. A deployment operation is essentially a reverse of the aforesaid retraction operation. A tonneau cover selectively covers a selected portion of the stowage compartment.

Description:
This appln claims benefit of Prov. No. 60/258,699 filed Dec. 29, 2000. 
    
    
     TECHNICAL FIELD 
     The present invention relates to automobiles, and more particularly to an automobile having a two piece retractable hard-top roof, wherein the actuation mechanism therefor is generally confined to a stowage compartment of the automobile, and wherein the retractable hard-top roof is stowed within the stowage compartment compactly in relation to the fore-aft dimension of the automobile. 
     BACKGROUND OF THE INVENTION 
     Automobile roof configurations may be broadly classed into “hard-tops” and “convertibles.” Hard-tops feature a rigid roof member composed of, and immovably affixed to, the skin material of the automobile, as for example steel. Convertibles feature a soft and flexible roof material which is stretched taunt over the passenger compartment by a frame. The frame is retractably configured such that the frame may be both retracted into, and deployed outwardly from, a compartment rearward of the passenger seating area, wherein the roof material compliantly follows the frame during its respective retraction and deployment movements. 
     Convertibles provide a wonderful sense of driving enjoyment, but have several disadvantages. The soft, flexible material of the convertible roof can degrade over time due to environmental factors, and the material admits noise entry into the passenger compartment at a level much higher than that admitted by a hard-top roof. 
     The concept of an automobile having a hard-top roof featuring convertible functionality is presented in U.S. Pat. No. 5,806,912. In this disclosure, a two-piece hard-top roof is selectively retractable into a compartment rearward with respect to the passenger seating area. In this regard, a first roof panel is frameably connected with a second roof panel. During a retraction movement, the first roof panel nestably travels on a framework of the second roof panel, then the nested first and second roof panels pivotably retract into the compartment. Disadvantageously, this concept appears to require that frame components be conspicuously located in the passenger compartment, and the pivoting movement would likely result in a large loss of otherwise useable space in the fore-aft dimension of the automobile. 
     Accordingly, what remains needed in the art is a retractable hard-top roof which does not require framework be placed into the passenger compartment when the hard-top roof is deployed, and further requires a minimal fore-aft dimension to accommodate storage when the retractable hard-top roof is retracted. 
     SUMMARY OF THE INVENTION 
     The present invention is a two piece retractable hard-top roof for interfacing with an automobile body assembly, the retractable hard-top roof having a forward roof component and a rearward roof component, wherein an actuation mechanism and its associated framework are not located in the passenger compartment, being generally located in a stowage compartment, and wherein a minimal fore-aft dimension is needed to accommodate storage of the retractable hard-top roof. 
     The forward and rearward roof components are constructed, typically, of the material of which the skin of the automobile is constructed, as for example steel, and each includes an interior header. A front end of the forward roof component is selectively affixable to the windshield trim so that, when deployed, the retractable hard-top roof is affixably joined to the windshield trim. The rearward roof component includes a rear window, is affixed at its rear end to the actuation mechanism, and is selectively affixable at its front end to the rear end of the forward roof component. The mid-seam formed by the joiner between the rear end of the forward roof component and the front end of the rearward roof component is provided with appropriate gasketing to prevent air and water leakage into the passenger compartment, wherein, for example, the mid-seam may be located generally medially of the (conjoined) retractable hard-top roof. 
     The actuation mechanism (and its associated framework) is generally located within a stowage compartment located rearward of the passenger seating area. The actuation mechanism includes a forward roof component actuator assembly, a rearward roof component actuator assembly, a joinder assembly, an affixment assembly, and a tonneau cover actuator assembly, the nature of which will become apparent from the following brief operational description of the present invention. 
     Beginning with the retractable hard-top roof at its deployed position, the driver selects a dashboard switch which commences retraction of the retractable hard-top roof. The sequence of events thereafter are managed by a microprocessor which is interfaced with the actuation mechanism. 
     The affixment assembly first actuates, wherein a first pair of flexible linkages are caused to rotate by an interconnected affixment actuator, whereupon latches located at the front end of the forward roof component disconnect from latch seats in the windshield trim, thus freeing the retractable hard-top roof from the windshield. 
     Next, the rearward roof actuator assembly actuates, causing the (still conjoined) retractable hard-top roof to retract into the stowage compartment. This movement is effected by a rearward carriage actuator moving a rearward carriage which is affixed to the rear end of the rearward roof component while a pair of rearward guide tracks within the stowage compartment define the movement. This retraction continues until the rearward roof component reaches a semi-seated position receivably within the stowage component. 
     Now the joinder assembly actuates, wherein a second pair of flexible linkages are caused to rotate by an interconnected joinder actuator, whereupon threaded fasteners located at the front end of the rearward roof component unthread from threaded bores located at the rear end of the forward roof component, thus freeing the forward roof component from the rearward roof component. Simultaneously a forward carriage moves via a forward carriage actuator guideably on a pair of forward guide tracks, and thereupon grasps the forward roof component. 
     Upon the threaded fasteners becoming released, the rearward roof component is lowered from the semi-seated position to its seated position within the stowage compartment by the rearward actuator. The forward carriage holds the forward roof component as the rearward roof component separates therefrom, and the forward carriage actuator causes the forward carriage to forwardly jog, and then retract the forward roof component receivably into the stowage compartment, the movement being defined by the forward guide tracks. Upon the conclusion of this movement, the forward roof component is located parallel to, and juxtaposed just fore of, the rearward roof component, both being generally vertically oriented and compactly spaced within the stowage compartment in relation to the fore-aft dimension of the automobile. 
     Lastly, the tonneau cover actuator assembly is actuated, causing a vertically stowed tonneau cover to vertically rise, pivot, and then cover the opening of the stowage compartment. 
     The deployment of the retractable hard-top roof is essentially a reverse of the aforesaid retraction steps. 
     Accordingly, it is an object of the present invention to provide a two piece retractable hard-top roof for an automobile, having a forward roof component and a rearward roof component, wherein the actuation mechanism (inclusive of its framework) is generally confined to the stowage compartment, and wherein a minimal fore-aft dimension is needed to accommodate storage of the retractable hard-top roof. 
     This and additional objects, features and advantages of the present invention will become clearer from the following specification of a preferred embodiment. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIGS. 1 through 7 are schematic views depicting operation of the retractable hard-top roof according to the present invention, shown sequentially from the deployed position to the retracted position. 
     FIG. 8 is a schematic view of a microprocessor control system according to the present invention. 
     FIG. 9 is a flow chart of the microprocessor control system event sequence according to the present invention. 
     FIG. 10 is a retract event sequence flow chart of the microprocessor control system according to the present invention. 
     FIG. 11 is a deploy event sequence detail flow chart of the microprocessor control system according to the present invention. 
     FIG. 12 is a top plan view of an automobile, showing examples of affixment and joinder linkages according to the present invention. 
     FIG. 13 is a detail view of joinder and affixment linkage connections, seen at circle  13  in FIG.  12 . 
     FIG. 14 is an elevational view of the front end of the rearward roof component. 
     FIG. 15 is an elevational view of the front end of the forward roof component. 
     FIGS. 16 and 17 are partly sectional views of the latch mechanism showing a sequence of latching steps according to the present invention. 
     FIG. 18 is a partly sectional view seen along line  18 — 18  of FIG.  17 . 
     FIG. 19 is a broken-away, perspective view of an example of an actuation mechanism according to the present invention for actuating the forward and rearward roof components. 
     FIG. 19A is a detail, partly sectional view of a grasp actuator of the actuation mechanism for grasping the forward roof component. 
     FIGS. 20A and 20B depict a tonneau cover actuator assembly of the actuation mechanism, showing deployed and stowed locations of the tonneau cover. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring now to the Drawing, FIGS. 1 through 7 depict an example of an automobile  10  in the form of an automobile body assembly equipped with a retractable hard-top roof  12  according to the present invention. The automobile  10  may be any type of motor vehicle, such as for example a passenger car, a pick-up truck, a sport utility vehicle; however, the preferred automobile has a rear portion that has a lower height than the roof, for example a two or four door car with a trunk lid located below the height of the rear window, or a pick-up truck. 
     The retractable hard-top roof  12  is two component, having a forward roof component  14  and a rearward roof component  16 . The forward and rearward roof components  14 ,  16  are composed of a rigid material, as for example steel, and each have an interior header. The forward and rearward roof components further have, as necessary, a sealing interface for side windows of the automobile. 
     The forward and rearward roof components  14 ,  16  are conjoined at a mid-seam  18  into a single, rigid unit for deployment and mutually separated thereat for stowage in a stowage compartment  20  located rearwardly of the seating area  22  of the passenger compartment  24  of the automobile  10 . The stowage compartment  20  is preferably demarcated from the seating area  22  by a bulkhead  26 , and includes a stowage compartment opening  28  through which the forward and rearward roof components  14 ,  16  pass with respect to the stowage compartment. 
     An actuation mechanism  30  provides microprocessor controlled deployment and retraction functions of the retractable hard-top roof  12 , wherein frame and actuator components thereof are not exposed or visible to occupants within the passenger compartment. The actuator mechanism  30  includes a forward roof component actuator assembly  32  for selectively moving the forward roof component, a rearward roof component actuator assembly  34  for selectively moving the rearward roof component, a joinder assembly  36  for selectively conjoining the forward and rearward roof components at the mid-seam, an affixment assembly  38  for selectively affixing the forward roof component to windshield trim  40 , and a tonneau cover actuator assembly  42  for providing selective covering of the stowage compartment opening by a tonneau cover  44 . 
     An overview of the retraction and deployment movements of the retractable hard-top roof  12  is depicted sequentially from FIG.  1  through FIG. 7, and transpires as generally recounted hereinabove (see the Summary of the Invention). 
     Referring now to FIG. 8, a microprocessor control system  50  for effectuating retraction and deployment of the forward and rearward roof components  14 ,  16  will be detailed. 
     An electronic control module (ECM)  52  is pre-programmed and/or programmable with instructions for providing retraction and deployment functions of the forward and rearward roof components. An actuation switch  54 , which is typically dashboard placed, provides a driver selectable deploy or retract actuation start command which is received and interpreted by the ECM  52 . The ECM  52  thereupon provides programmed signals to a joinder actuator  56  of the joinder assembly, an affixment actuator  58  of the affixment assembly, a rearward carriage actuator  60  of the rearward roof component actuator assembly, a tonneau cover actuator  62  of the tonneau cover actuator assembly, and a forward carriage actuator  64  of the forward roof component actuator assembly which assembly includes a forward roof component grasp mechanism actuated by a grasp actuator  64   a  that is also responsive to the signals from the ECM. 
     As the ECM  52  signals the various actuators, the ECM continuously monitors fault detection sensors  66  and, should a fault be detected, provides a preprogrammed response appropriate to the detected fault. Detected faults are processed by the ECM according to a preprogrammed fault routine, which, for example, may result in a system-wide preprogrammed shut-down in the event of a major fault, or mere recordation of a fault code for a technician to later take note of in the event of a minor fault. The fault routine, for example, could resolve a binding problem as follows: upon detection of a binding fault, the actuator involved may be signaled to stop, reverse slightly, and then proceed slowly forward again so long as binding forces remain below a predetermined threshold. 
     Various other sensors are provided for the ECM  52  to monitor proper function of the retraction and deployment movements of the forward and rearward roof components. For example, windshield affixment sensors  68  sense whether or not the forward roof panel is affixed to the windshield trim, and may further detect the tightness of the affixment; joinder sensors  70  sense whether or not the forward rood component is conjoined to the rearward roof component, and may further detect the tightness of the joinder; forward carriage sensors  72  detect the position of the forward roof component within the stowage compartment, as well as the grasping thereto by the grasping mechanism; rearward carriage sensors  74  detect the position of the rearward roof component; and tonneau cover sensors  76  detect the position of the tonneau cover. 
     Referring next to FIG. 9, a flow diagram  80  of a program of the ECM  52  will be detailed. At block  82  the program is initialized, typically for example, when the automobile ignition key is turned in the ignition switch to an “on” position. The program then awaits an actuation command from the actuation switch  54 . At decision block  84 , an actuation of the actuation switch is interpreted as a deployment command (D) or a retraction command (R), otherwise if no actuation of the switch occurs, the program waits. 
     If a retraction command is received, the program inquires at decision block  86  whether the forward and rearward roof components are already retracted. If yes, the program waits; if no, the program proceeds. The program inquires at decision block  88  whether a new command has been detected (that is, has the driver now decided instead to deploy the forward and rearward roof components). If yes, the program returns to decision block  84  and then processes the command. If no, the program advances to decision block  90  and thereat inquires if a fault has been detected. If the inquiry at decision block  90  is yes, the program advances to the fault routine block  92  and thereat performs a fault redress routine appropriate to the detected fault. Thereafter at block  94 , the program returns, stops or jumps to an appropriate juncture in the program as determined by the fault routine. If the inquiry at decision block  90  is no, then the program advances to execution block  96 , whereat the forward and rearward roof components are retracted. The program periodically inquires whether the retraction process has completed at decision block  98 . If the retraction process has not yet completed, then program again makes inquiries at decision blocks  88  and  90 ; however, if the retraction process has concluded, then the program returns to decision block  84  to await a next command. 
     If a deployment command is received, the program inquires at decision block  100  whether the forward and rearward roof components are already deployed. If yes, the program waits; if no, the program proceeds. The program inquires at decision block  102  whether a new command has been detected (that is, has the driver now decided instead to retract the forward and rearward roof components). If yes, the program returns to decision block  84  and then processes the command. If no, the program advances to decision block  104  and thereat inquires if a fault has been detected. If the inquiry at decision block  104  is yes, the program advances to the fault routine block  92  and thereat performs a fault redress routine appropriate to the detected fault. Thereafter at block  94 , the program returns, stops or jumps to an appropriate juncture in the program as determined by the fault routine. If the inquiry at decision block  104  is no, then the program advances to execution block  106 , whereat the forward and rearward roof components are deployed. The program periodically inquires whether the deployment process has completed at decision block  108 . If the deployment process has not yet completed, then program again makes inquiries at decision blocks  102  and  104 ; however, if the deployment process has concluded, then the program returns to decision block  84  to await a next command. 
     Referring now to FIG. 10, a retract event sequence flow chart of execution block  96  of the flow diagram  80  will be detailed. 
     The program, at execution block  114 , signals actuation of the affixment actuator so as to thereby release affixment of the front end of the forward roof component with respect to the windshield trim, as for example by rotating latches out of latch seats. The program then inquires at decision block  116  whether sensors have detected a release. If not, the program advances to the fault routine at execution block  92 ; otherwise the program advances to execution block  118 . At execution block  118 , a signal is sent to the rearward carriage actuator to loweringly retract the conjoined forward and rearward roof components (that is, to retract as a single unit) so that the rearward roof component reaches a semi-seated location. The program then inquires at decision block  120  whether sensors report that the rearward roof component has stopped at the semi-seated location. If not, the program advances to the fault routine at execution block  92 ; otherwise the program advances to execution block  122 . At execution block  122 , the forward carriage actuator and the grasp actuator are signaled by the program to engage the forward roof component. For example, threaded studs are brought into alignment with threaded bores at the interior of the forward roof component by the forward carriage actuator, then threaded thereinto by the grasp actuator. The program then inquires at decision block  124  whether sensors report that the forward roof component is grasped. If not, the program advances to the fault routine at execution block  92 ; otherwise the program advances to execution block  126 . At execution block  126  the program signals the joinder actuator to actuate so as to free the forward roof component from the rearward roof component. For example, threaded studs of the rearward roof component are caused to unthread from threaded bores of the forward roof component. The program then inquires at decision block  128  whether sensors report that the forward roof component is detached from the rearward roof component. If not, the program advances to the fault routine at execution block  92 ; otherwise the program advances to execution block  130 . At execution block  130  the program signals the rearward carriage actuator to seat the rearward roof component. At decision block  132  the program inquires whether sensors report the rearward roof component is seated. If not, the program advances to the fault routine at execution block  92 ; otherwise the program advances to execution block  134 . At execution block  134  the program signals the forward carriage actuator to retract and seat the forward roof component. At decision block  136  the program inquires whether sensors report the forward roof component is seated. If not, the program advances to the fault routine at execution block  92 ; otherwise the program advances to execution block  138 . At execution block  138  the program signals the tonneau cover actuator to deploy the tonneau cover so as to cover the opening of the stowage compartment. At decision block  140  the program inquires whether sensors report the tonneau cover is deployed. If not, the program advances to the fault routine at execution block  92 ; otherwise the program advances to block  142  and returns. 
     Referring now to FIG. 11, a deploy event sequence flow chart of execution block  106  of the flow diagram  80  will be detailed. 
     At execution block  150  the program signals the tonneau cover actuator to retract the tonneau cover so as to uncover the opening of the stowage compartment. At decision block  152  the program inquires whether sensors report the tonneau cover is stowed. If not, the program advances to the fault routine at execution block  92 ; otherwise the program advances to execution block  154 . At execution block  154  the program signals the forward carriage actuator to advance the forward roof component to a joinder location. At decision block  156  the program inquires whether sensors report the forward roof component is at the joinder location. If not, the program advances to the fault routine at execution block  92 ; otherwise the program advances to execution block  158 . At execution block  158  the program signals the rearward carriage actuator to advance the rearward roof component to the semi-seated location. At decision block  160  the program inquires whether sensors report the rearward roof component is at the semi-seated location (whereat the rear end of the forward roof component is adjoining the front end of the rearward roof component). If not, the program advances to the fault routine at execution block  92 ; otherwise the program advances to execution block  162 . At execution block  162  the program signals the joinder actuator to actuate so as to join the forward roof component to the rearward roof component. Per the above example, threaded studs of the rearward roof component are caused to thread into threaded bores of the forward roof component so as to make them a single rigid unit, tightly sealed at the mid-seam. The program then inquires at decision block  164  whether sensors report that the forward roof component is joined to the rearward roof component. If not, the program advances to the fault routine at execution block  92 ; otherwise the program advances to execution block  166 . At execution block  166 , the grasp actuator is signaled by the program to disengage from the forward roof component. Per the above example, the threaded studs are unthreaded from the threaded bores by the grasp actuator. The program then inquires at decision block  168  whether sensors report that the forward roof component is ungrasped. If not, the program advances to the fault routine at execution block  92 ; otherwise the program advances to execution block  170 . At execution block  170 , a signal is sent to the rearward carriage actuator to raisingly deploy the conjoined forward and rearward roof components (that is, to deploy as a single unit) so that the front end of the forward roof component reaches the windshield trim. The program then inquires at decision block  172  whether sensors report that the front end of the forward roof component has reached a predetermined spacing from the windshield trim. If not, the program advances to the fault routine at execution block  92 ; otherwise the program advances to execution block  174 . The program, at execution block  174 , signals actuation of the affixment actuator so as to thereby affix the front end of the forward roof component to the windshield trim, as per the above example by rotating the latches into the latch seats. The program then inquires at decision block  176  whether sensors have detected affixment. If not, the program advances to the fault routine at execution block  92 ; otherwise the program advances to block  178  and returns. 
     Turning attention now to structures for carrying out the aforesaid functions, FIGS. 12 through 20B depict structural examples for exemplar purposes only, since commercially practicable structures would be chosen and configured to suit a particular automobile type and style, and accordingly may be operatively and structurally quite different from that shown and described hereinbelow. The affixment linkage  202  is located entirely within the forward and rearward roof components  14 ,  16 , and the joinder linkage  200  is located entirely within the rearward roof component  16 , and completely unseen to occupants. 
     FIG. 12 depicts a set of joinder linkages  200  and a set of affixment linkages  202 , each utilizing, preferably, flexible cables capable of transmitting therealong rotational torque. The set of affixment linkages  202  includes a pair of affixment couplings  204  for transmitting rotational torque from one side of the mid-seam  18  to the other side of the mid-seam (see detail at FIG.  13 ). 
     Turning attention firstly to the hereinabove mentioned joinder assembly  36 , the joinder linkages  200  are each connected, respectively, to a joinder actuator  56 , shown at FIG. 19, for providing rotative torque thereto. As shown at FIG. 13, each joinder linkage terminates in a joinder mechanism  208 , including a (preferably spring loaded) threaded joinder stud  210  and a joinder drive socket  212  connected to its respective joinder linkage. In operation to conjoin the front end  16 F of the rearward roof component  16  to the rear end  14 R of the forward roof component  14 , the joinder actuator  56  causes the joinder linkages  200  to rotate, causing the joinder drive sockets  212  to rotate, and, in turn, causing the joinder studs  210  to thread seatably into respective threaded joinder bores  214  of the rear end  14 R. To release the conjoinder, the joinder actuator is reversed. Other equally preferred affixment assemblies may be used, the foregoing description being illustrative. 
     Referring to FIG. 14, the forward end  16 F of the rearward roof component  16  has a gasket  216  for sealing against the rear end  14 R (see FIG. 13) of the forward roof component  14 , and further has side window seals  218  and a header  220 . A removable front panel  222  provides service access to the joinder mechanisms  208 . 
     Referring to FIG. 15, the forward end  14 F of the forward roof component  14  has an overhang  224 , a gasket  226 , a pair of L-shaped latches  228 , each projecting through a removable service plate  230 , a header  232 , and preferably has side window seals  218 ′. 
     Turning attention now to the aforementioned affixment assembly  38 , each affixment linkage terminates in a latch mechanism  234 , each respectively being selectively latchable, via its latch  228 , onto a hook  236  (latch seat) of the windshield trim  40 . The affixment assembly  38  includes further an affixment actuator  58  (see FIG. 19) connected to a respective end of each affixment linkage. Each latch mechanism includes the above mentioned latch  228 , wherein the latch has a threaded section, a latch nut  238  which is threaded thereon, and a latch socket  240  which is connected to an end of a respective affixment linkage  202 . As shown at FIGS. 16 through 18, when the front end of the forward roof component  14  is proximate the windshield trim, the latch  228  clears the hook  236 . As the affixment actuator  58  actuates, the latch socket  240  causes the latch  228  to turn ninety degrees into an interfering relationship with the hook  236 , and the latch nut  238  is caused to thread on the threaded section of the latch, causing the latch to pull tight against the hook and thereby affixingly seal the front end  14 F of the forward roof component to the windshield trim  40 . To release the affixment, the affixment actuator is reversed, the latch pivoting in the opposite direction ninety degrees to again be clear of the hook. Alternatively, the affixment linkages could be a single linkage at the affixment actuator with one affixment coupling, then forking into two linkages within the forward roof component. As an example of another alternative of the affixment assembly, a latch mechanism may be incorporated in the windshield trim, thereby obviating placement of an affixment linkage in the forward and rearward roof components. 
     Turning attention now to FIGS. 19 and 19A, an illustration of the aforementioned actuator mechanism  30  will be exemplified with regard to the forward and rearward roof actuator assemblies  32 ,  34 . 
     With regard firstly to the forward roof actuator assembly  32 , a pivot mount  250  provides a base for a forward carriage  252 . The forward carriage actuator  64 , which is connected with the pivot mount  250 , provides rotation to a ball-screw  254  which is threadably engaged with the forward carriage  252  so as to raise and lower the forward carriage depending on the direction of rotation of the ball-screw in guidance by left and right forward guide tracks  255 . A secondary forward carriage actuator  64 ′ is connected with the forward carriage  252  and provides the aforementioned jogging movement of the forward roof component  14 . The grasp actuator  64   a , depicted in FIG. 19A, is connected to a frame member  256  of the forward carriage  252 , and includes a threaded grasp stud  258  which threads into a threaded grasp bore  260  at the headliner side of the forward roof component  14 . 
     With regard next to the rearward roof actuator assembly  34 , a second pivot mount  262  provides a base for a rearward carriage  264 . The rearward carriage actuator  60 , which is connected with the second pivot mount  262 , provides rotation to a second ball-screw  266  which is threadably engaged with the rearward carriage  264  so as to raise and lower the rearward carriage depending on the direction of rotation of the second ball-screw in guidance by left and right rearward guide tracks  265 . The rear end  16 R of the rearward roof component  14  is connected to the rearward carriage  264 . 
     Referring now to FIGS. 20A and 20B, the tonneau cover actuator assembly  42  of the actuator mechanism  30  will be exemplified. The tonneau cover actuator  62  includes a primary tonneau cover actuator  268  connected to first and second secondary tonneau cover actuators  270 ,  272  which are connected to the tonneau cover  44  in a mutually spaced apart relation. Advance and retract actuation of the primary tonneau cover actuator  268  raises and lowers the tonneau cover  44 . By, for example, advancing the first secondary tonneau cover actuator  270  while simultaneously retracting the second secondary tonneau cover actuator  272  (or vice versa), the tonneau cover is made to pivot. Selective actuation of the primary tonneau cover actuator  268  in combination with independent selective actuation of the first and second secondary tonneau cover actuators  270 ,  272 , provide the aforesaid deploy and retract movements of the tonneau cover  44 . It is to be noted that the foregoing description is merely illustrative, and other mechanisms accomplishing the tonneau cover movements would also be preferred. 
     When deployed, the rearward roof component  16  sealably adjoins the rear deck panel  274  via a seal  276 . An actuator operated interior trim cover may be provided to close the stowage compartment within the passenger compartment; alternatively the bulkhead  26  may be pivotally mounted and moved to provide closure via an actuator. 
     To those skilled in the art to which this invention appertains, the above described preferred embodiment may be subject to change or modification. Such change or modification can be carried out without departing from the scope of the invention, which is intended to be limited only by the scope of the appended claims.