Patent Publication Number: US-6701799-B2

Title: Adjustable automobile pedal system

Description:
CROSS-REFERENCES TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 09/250,476, which was filed on Feb. 14, 1999 now U.S. Pat. No. 6,324,939. 
    
    
     FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     Not applicable. 
     REFERENCE TO A MICROFICHE APPENDIX 
     Not applicable. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention generally relates to automobile control pedals, such as brake, clutch and accelerator pedals. More specifically, this invention relates to an adjustable automobile control pedal system whose pedals can be selectively adjusted to allow optimal positioning of the pedals relative to the driver of the automobile. 
     2. Description of the Prior Art 
     Automobiles are conventionally provided with foot-operated control pedals, such as an accelerator, brake and clutch pedal that are used in the control of motion and speed of the automobile. Typically, these control pedals are permanently fixed to the vehicle body and rotate or pivot away from the driver when foot pressure is applied, and are not adjustable relative to the driver or their respective attachment points. Consequently, the control pedals must generally be attached so as to be positioned relative to the driver of the vehicle to afford operation that is adequately safe and comfortable for the “average” driver. However, some adjustment of the driver&#39;s position relative to the control pedals is clearly desirable since the vehicle and its controls must accommodate drivers of various physical attributes. 
     Though the driver&#39;s seat is usually mounted so as to be slidable in a fore and aft and up and down direction to accommodate drivers of different physiques, such an arrangement is only partially effective in positioning the driver relative to the control pedals. Seat adjustment allows the driver to position himself or herself relative to the automobile&#39;s steering wheel and the control pedals, to some degree improving the driver&#39;s comfort and facilitating the driver&#39;s ability to operate the vehicle&#39;s primary controls. It is, however, nearly impossible for such a solution to accommodate all possible variations in the human frame. In particular, proportional differences between the lengths of a driver&#39;s arms, legs and feet in relation to the driver&#39;s overall physique cannot be readily accommodated by merely adjusting the seat fore and aft or up and down with respect to the control pedals. Accordingly, it has been recognized that some form of control pedal adjustment is desirable to provide optimal comfort and safety to the driver while also ensuring that the driver can fully operate the control pedals at all times. 
     Lever mechanisms, of course, are known in the prior art. The adjustment of one lever with respect to another concentrically mounted lever can also be found in wear or slack adjuster mechanisms. For example, Tack et al., U.S. Pat. No. 2,550,731, and Tack et al., U.S. Pat. No. 2,550,732, teach a manually operated screw mechanism threaded into one lever and operatively connected to associated hangers for adjusting the slack conditions in the brake rigging by adjustment with respect to the hangers and simultaneously modifying the position of the brake lever where it is connected to the associated brake rigging to allow for further wear adjustment. 
     Many approaches to providing adjustable control pedals have been suggested in the prior art. One approach is to provide some form of ratchet device that allows the entire control pedal assembly to rotate about a primary pivot point. This approach rotates a housing to which the control pedals are each rotatably attached, thus providing rotation of the control pedals in unison relative to the driver. Examples of this approach are illustrated in U.S. Pat. No. 3,282,125 to Dully, U.S. Pat. No. 3,400,607 to Smith, and U.S. Pat. No. 3,563,111 to Zeigler. A similar approach is to mount one or more control pedals to a housing, attached to the body of the vehicle, which is slidable fore and aft as a unit relative to the driver, as illustrated in U.S. Pat. No. 2,860,720 to Huff et al., U.S. Pat. No. 4,683,977 to Salmon, U.S. Pat. No. 5,010,782 to Asano et al., and British Patent No. 952,831 to Mussell. As taught by Asano et al., the entire housing and pedal assembly rotates about a single pivot point during actuation of the pedals. A disadvantage with pedal systems such as that of Asano et al. is that a spring is required to return the pedal and housing assembly to its initial position, necessitating that the driver also overcome the force generated by the spring in order to actuate the pedal, resulting in an increase of brake pedal effort. 
     Another suggested approach is a variation on the two previously mentioned, employing a screw-actuated device to displace a housing to which one or more control pedals are rotatably mounted. The screw-actuated device can be used to either rotate the entire housing about a pivot point, as shown in U.S. Pat. No. 3,151,499 to Roe, or the screw-actuated device can displace the housing fore and aft, as illustrated by U.S. Pat. No. 3,301,088 to White; U.S. Pat. No. 3,643,525 to Gibas; U.S. Pat. No. 3,765,264 to Bruhn, Jr.; U.S. Pat. No. 4,870,871 to Ivan; U.S. Pat. No. 4,875,385 to Sitrin; U.S. Pat. Nos. 4,989,474 and 5,078,024 to Cicotte et al.; and U.S. Pat. No. 5,460,061 to Redding, et al. Typically, the screw-actuated device is disclosed to be driven by an electric motor, which allows the control pedals to be selectively adjusted by the driver from an appropriate actuator switch mounted on the dashboard of the vehicle within the driver&#39;s reach. 
     A further attempt to provide a solution for this problem is disclosed by Rixon et al. in U.S. Pat. No. 5,632,183, wherein a pedal assembly is mounted on a single hollow guide rod extending forwardly from a transmission housing that is pivotably mounted to a bracket secured to a body portion of the vehicle. A helical ball and nut assembly is positioned within the single hollow guide and extends from the transmission housing. A key extends from the nut to the pedal assembly that is mounted to the outside diameter of the single hollow guide so that linear movement of the nut along the helical thread within the hollow guide generates linear movement in forward or rearward directions of the pedal assembly along the hollow guide rod. 
     As can be readily appreciated by those skilled in the art, the above examples all require substantial hardware and space beneath the automobile&#39;s instrument panel to accommodate the device and its associated structure providing the adjustment features. Much of the necessary additional hardware can be attributed to the need to avoid affecting the operation of the brake and/or clutch pedals, during adjustment, with their respective power sources. Specifically, the approach chosen must avoid causing the brake pushrod and accelerator cable attachment points that actuate the respective brake and accelerator components to be displaced relative to their designed positions so as to ensure operation within the correct operational characteristics of the brakes, clutch, and/or accelerator pedals. 
     In addition, it is generally preferable that the approach chosen have no effect on the mechanical advantage of the brake control pedal as determined by the brake control pedal&#39;s orientation relative to the brake pushrod. Generally, the mechanical advantage of a control pedal can be described as the relative effort required to apply the brake pedal as compared to the actual force required to actuate the adjustment device associated with the brake pedal. For instance, mechanical advantage can be increased by moving the contact point between the brake pedal and the brake cylinder&#39;s pushrod toward the pivot point of the brake pedal. 
     To avoid changing the mechanical advantage, the adjustable control pedal assemblies of the prior art generally teach a device in which the control pedals are independently adjusted so as to produce no adverse effect with respect to repositioning of the pedal pivot point relative to the pushrods of the respective operating cylinders, as can be seen with the teachings of Cicotte et al. in U.S. Pat. Nos. 5,351,573, 5,771,752 and 5,823,064. Alternatively, the adjustment device must be provided with a mechanism that simultaneously adjusts the length of the pushrod to accommodate the displacement of the control pedal assembly, as seen with the teachings of Bruhn, Jr. 
     Though regarding an unrelated and non-analogous problem associated with optimizing the mechanical advantage of a control pedal, U.S. Pat. No. 3,798,995 to Schroter teaches the use of a variable-ratio control pedal utilizing a camming contour for amplifying the mechanical advantage of the control pedal in the latter stages of the control pedal stroke. The intent with such a device is to maximize the driver&#39;s braking effort without the need for excessive forces applied to the control pedal. However, the teachings of Schroter are directed entirely toward achieving an optimal mechanical advantage and do not provide any adjustment of the control pedals with respect to the position of the driver. Further, Schroter does not teach or suggest a solution to the problem of adjusting the positions of the control pedals, nor does Schroter even recognize the problem to which the above prior art is directed. 
     From the above discussion, with the exception of the recent Cicotte patents, it can be readily appreciated that the prior art does not disclose an automobile control pedal arrangement that can be adjusted to adapt to the particular physiological requirements of a driver, while simultaneously avoiding the requirement of mounting the entire control pedal assembly to a housing that is either pivotable or displaceable relative to the position of the driver, without affecting the brake effort, however small. Nor does the prior art teach or suggest an apparatus that entails minimal additional hardware to achieve suitable adjustment of one or more control or accelerator pedals to the effect that no repositioning of the prior art pivot point locations is required and, therefore, no significant structural changes need be made to a conventional control pedal arrangement. 
     Although, generally, repositioning of an attachment or pivot point is unacceptable because of its effect on brake/accelerator/clutch pedal forces or efforts, the specifications for angular variations are more generous because small angular variations with respect to current pivot point locations have little or no effect on the operational parameters, i.e., brake/clutch effort. 
     Accordingly, what is needed is a cost-efficient adjustment device for adjusting one or more automobile brake/clutch control and/or accelerator pedals, as well as footrests. The adjustment device is capable of spatially adjusting the control pedals without repositioning the pivot attachment of the conventional control pedal arrangement to adapt to the physical and physiological demands of a driver, and is simultaneously cost effective by requiring minimal structural components and modifications to achieve the desired functional and safety results. 
     SUMMARY OF THE INVENTION 
     According to the present invention there is provided an adjustment device for one or more automobile control and/or accelerator pedals and/or footrest. The adjustment device is capable of causing pivotable adjustment, utilizing with very slight variation the conventional pivot point position of the control pedals to adjust one or more control pedals independently or in unison relative to a predetermined datum point. The datum point is preferably defined by a reaction member upon which the control pedal operates, such as the pivot eyelet of a master cylinder pushrod for a clutch or brake pedal, due to the requirement that no force be exerted on the accelerator/clutch or brake master cylinder during adjustment of the respective control pedals. For an accelerator pedal, the reaction member is typically a flexible cable by which the air/fuel supply delivery system is operated. Because the accelerator pedal is typically pivotally mounted to the floor pan of a vehicle for purposes of actuating the cable, the datum point may be any suitable, currently established reference point that allows conventional operation of the accelerator pedal with respect to the cable. Being adjustably pivotable in this manner, the control pedals can be optimally positioned to accommodate prior art routings for the accelerator cable and brake pushrod, as well as to suit the needs of a particular driver. 
     Conventionally, each control pedal includes a pedal arm that is pivotally attached to a housing bracket beneath the instrument panel of the automobile by means of a pivot pin and bushing or the like. Where the control pedal is the brake or clutch pedal, the adjustment device of the present invention is mounted alongside the conventional control pedal arm and pivotally attached at the eyelet of the master cylinder pushrod, in turn providing an attachment pivot about which the pedal arm pivots during adjustment, while maintaining a predetermined relationship between the pushrod eyelet and the pivot attachment of the control pedal arm. Consequently, the adjustment device can be readily adapted to fit conventional control pedal assemblies without any modification of the fore/aft position of the pushrod eyelet. Some limited angular displacement (within specified tolerances) with respect to the exit point in the front dash is permitted. 
     According to the preferred embodiment of the present invention, the pushrod of the brake master cylinder is pivotally mounted to the brake pedal arm at a location between the uppermost and lowermost ends of the brake pedal arm. Pivoting of the brake pedal arm is accomplished by actuation of an electric motor and gearbox assembly, that is mounted at a fixed location on a mounting bracket and acts on a transversely extending pivot shaft mounted within opposing straight slots in the mounting bracket to which the brake pedal arm is pivotally secured at a location near the uppermost end of the brake pedal arm. The pivot shaft is oscillatable within the opposing straight slots of the fixed mounting bracket and the brake pedal is caused to move toward or away from the driver by the actuation of the electric motor and gearbox assembly whose output shaft is externally threaded and is received in an internally threaded opening of a pivotable clevis housing mounted to the pivot shaft. The pivot shaft also carries an accelerator pedal adjustment link arm, which is attached to the accelerator pedal arm, to slave the accelerator pedal to the brake pedal so that in the preferred embodiment as the brake pedal is moved toward or away from the seated position of the driver by the operation of the electric motor and gearbox assembly, the accelerator pedal will similarly be moved toward or away from the driver by an equivalent amount. Those skilled in the prior art will quickly recognize that each pedal can be independently controlled by its own adjustable mechanism so as to enable different pedal adjustments to individual pedals, if desired. Because of the modular assembly of the accelerator pedal and brake pedal being attached to the same mounting bracket, the preferred embodiment of the present invention eliminates the need for the use of cables between the accelerator pedal adjuster mechanism and brake pedal adjuster mechanism of the various embodiments of the invention described in the aforesaid disclosed prior art. 
     Accordingly, it is an object of the present invention to provide an adjustable pedal system for adjusting the positions of one or more automobile control pedals that is capable of optimally positioning the control pedals relative to the driver without affecting the current positions of the pivot point of the brake pedal arm. 
     It is a further object of the present invention to provide an automobile pedal system of the foregoing character that is capable of adjusting the positions of automobile control pedals relative to a predetermined fixed datum, such as the pushrod eyelet of the hydraulic cylinder that is operated by the brake pedal. 
     It is still a further object of the present invention to provide an automobile pedal system of the foregoing character that eliminates the need for wire cables between the brake and accelerator pedal mechanisms that are characteristic of some prior adjustable pedal systems. 
     It is another object of the present invention to provide an adjustable brake/clutch/accelerator/footrest pedal that utilizes a compact electric motor, gearbox and actuator shaft assembly with limited movement during operation thereof and is economical and easy to manufacture. 
     It is yet another object of the present invention to provide a modular assembly of an adjustable brake/clutch/accelerator/footrest pedal adjustment device that reduces the number of components, reduces the cost of assembly, and is intended to drop in place on a current production vehicle. 
     It is still a further object of the present invention to provide a brake/clutch/accelerator/footrest adjustable pedal assembly that utilizes a single mounting bracket to mount all adjustable components of an accelerator brake or clutch pedal. 
     For a further understanding of the present invention and the objects thereof, attention is directed to the drawings and the following brief description thereof, to the detailed description of the preferred embodiment and to the appended claims. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an elevational side view of the brake and accelerator pedals and related position adjustment elements of an adjustable automobile pedal system according to the preferred embodiment of the present invention in the most forward position (away from the driver) of the adjustable pedals shown therein; 
     FIG. 2 is a view similar to FIG. 1 in the most rearward position (closest to the driver) of the adjustable pedals shown therein; 
     FIG. 3 is a sectional view taken on line  3 — 3  of FIG. 1; 
     FIG. 4 is an elevational view taken in the direct of arrow A of FIG. 1 including the clutch pedal, clutch pedal arm and motor shown in phantom; 
     FIG. 5 is an elevational side view of an alternate embodiment of the present invention; 
     FIG. 6 is a sectional view taken along line  6 — 6  of FIG. 5; and 
     FIG. 7 is a cross-sectional view taken along line  7 — 7  of FIG.  5 . 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     With reference to FIGS. 1-4, there is shown an adjustable automobile pedal system according to the preferred embodiment of the present invention; the adjustable pedal system is indicated generally by reference number  10 . The adjustable pedal system  10  includes a brake pedal  12 , that is positioned at the lowermost end of a brake pedal arm  14 , and an accelerator pedal  16 , that is positioned at the lowermost end of an accelerator pedal arm  18 . As is clear from a comparison of FIGS. 1 and 2, that illustrates the total travel adjustment positions of the brake pedal  12  and the accelerator pedal  16 , that is, the adjusted end of travel (FIG. 2) and beginning of travel (FIG. 1) positions the pedals will occupy when the pedals are not being engaged by a foot of an operator, the brake pedal  12  and the accelerator pedal  16  are capable of being moved toward or away from the operator in unison, between limits, as will be hereinafter described more fully. 
     The brake pedal arm  14  is pivotably attached at  15  establishing a pedal arm pivot axis and acts on a pushrod  20  of a brake master cylinder, otherwise not shown. The pushrod  20  pivotally engages the brake pedal arm  14  at a location between the uppermost and lowermost ends of the brake pedal arm  14 , the selected engaging point being so as to not affect the brake effort in any way whatsoever from the designed brake effort for the specific vehicle. Thus, when an operator depresses the brake pedal  12 , the brake pedal arm  14  will push the pusbrod  20  into the booster and associated brake master cylinder to impart a braking force to the vehicle in which the pedal system  10  is installed. Similarly, the accelerator pedal arm  18  engages an accelerator cable  22 , the accelerator cable  22  being engaged by the accelerator pedal arm  18  at a location near the uppermost end of the accelerator pedal arm  18 . Thus, when an operator depresses the accelerator pedal  16 , the accelerator pedal arm  18  will pull the accelerator cable  22  to impart an accelerating action to the vehicle in which the pedal system  10  is installed as is well understood by a person skilled in the prior art. 
     Adjustment between the fore and aft positions of the brake pedal  12  and the accelerator pedal  16  involves the use of a generally “U” shaped bracket  24 , having a flange  25  (shown in FIG. 3) at the open end, that can be mounted under the dashboard in a fixed position under the instrument panel of an automobile, otherwise not shown, it being understood that the dashboard of the automobile is positioned to the left of the bracket  24  in the orientation of the bracket  24  shown in FIGS. 1 and 2. As is clear from FIG. 3, the bracket  24  has a spaced apart pair of legs  24   a  and  24   b  and is closed at one end by a transverse end  24   c , the opposed end of the bracket  24  being open. 
     The legs  24   a  and  24   b  of the bracket  24  are provided with straight slots  24   d  and  24   e  respectively, and a pivot shaft  26  extends transversely of the bracket  24 , through the slots  24   d  and  24   e.  Mounted to the portion of the pivot shaft  26  that is within the legs  24   a  and  24   b  of the bracket  24  is a pivotable clevis housing  28 , that oscillates with the pivot shaft  26  as the pivot shaft  26  moves from a foremost to a rearmost position within the slots  24   d  and  24   e  of the bracket  24 , as hereinafter described more fully. The clevis housing  28  has a sleeve  30  extending between opposed legs  28   a  and  28   b  of the clevis housing  28 , and the sleeve  30  circumscribes that portion of the pivot shaft  26  between the opposing legs  28   a  and  28   b  with appropriate bearings  31  therebetween so as to oscillate with the pivot shaft  26  as the pivot shaft  26  moves from one extreme end to the opposite extreme end of the slots  24   d  and  24   e  of the bracket  24 . 
     The oscillating movement of the pivot shaft  26  within the slots  24   d  and  24   e  of the bracket  24 , as heretofore described, causes the sleeve  30  to oscillate with the pivot shaft  26 . The oscillation of the sleeve  30 , in turn, will cause the brake pedal arm  14  to pivot about the free end of the pushrod  20  because the brake pedal arm  14  is pivotally attached to the sleeve  30  at a location near its uppermost end, as is shown most clearly in FIG.  3 . The pivoting of the brake pedal arm  14 , in turn, is imparted to the accelerator pedal arm  18  by an accelerator pedal adjustment link  32  as more clearly shown in FIG.  4 . An uppermost end of the adjustment link  32  is offset and pivotally attached to the pivot shaft  26  at a location external to the leg  24   b  of the “U” shaped bracket  24 . 
     The adjustment link  32  has a longitudinal slot  32   a  at the uppermost end to receive the pivot shaft  26  therethrough. The adjustment link  32  is also attached with a fixed pivot  34  to one leg  24   b  of the housing bracket  24 . A lower end of the accelerator pedal adjustment link  32  is pivotally attached (shown at  18   a ) to the accelerator pedal arm  18  at a location between the uppermost end and the lowermost end of the accelerator pedal arm  18 . Operation of the accelerator pedal arm  18  by an operator, thus, results in pivoting of the accelerator pedal arm  18  about the location of its attachment point  18   a  to the lowermost end of the accelerator pedal adjustment link  32  in a similar manner so as to “pull” on the accelerator cable  22 . In a similar manner, the operation of the brake pedal arm  14  by an operator results in pivoting of the brake pedal arm  14  about the location of its attachment to the sleeve  30  that surrounds the pivot shaft  26  and imparts a brake force on the master cylinder connecting rod at its attachment point  15  to actuate the brake. Thus, the brake pedal arm  14  functions as a first class lever and the accelerator pedal arm  18  functions as a second class lever. 
     Fore and aft adjustment of the brake and accelerator pedal arms  14  and  18  is accomplished by the use of a helical screw  36  that has one end threaded into a helical threaded aperture  28   e  in the pivotable clevis housing  28 . The opposite end of the helical screw  36  is attached to a gearbox and electric motor assembly  38  mounted to the closed transverse end  24   c  of the “U” shaped bracket  24 . An aperture  24   f  in a spherical dimple  24   g  in the closed transverse end  24   c  of the “U” shaped bracket  24  allows the helical screw  36  to pass therethrough and be fastened to the electric motor drive shaft in any conventional way. The gearbox and electric motor assembly  38  is attached to the closed transverse end  24   c  of the bracket  24  by a lock nut  38   a  located within the “U” shaped bracket  24  and mounted to a threaded sleeve located within the aperture, and a second lock nut  38   b  having a spherical end surface complementary to the spherical dimple  24   g  in the transverse end  24   c  of the “U” shaped bracket. This arrangement permits the electric motor to be locked in place against the spherical dimple and pivot about the spherical dimple  24   g  as will be clearly understood from an operational description that follows. 
     In operation when it is desired to adjust the accelerator and brake pedal from their most forward position shown in FIG. 1 to a position closer to the driver of the vehicle, the electric motor is energized to drive the gear box that turns the helical screw  36 . As the helical screw  36  begins to rotate, the pivotable clevis housing  28  is moved in a linear direction away from the closed transverse end  24   c  of the bracket  24 . Since the opposing walls of the clevis housing  28  are mounted on the pivot shaft  26 , the pivot shaft  26  is moved along the straight lines of the slots  24   d  and  24   e.  Simultaneously the brake pedal is pivoted about its pivot attachment point  15  to move the brake pedal  12  rearwards or forwards to the driver seated in the vehicle. Since the preferred embodiment illustrates a modular unit, the accelerator pedal will simultaneously be moved rearwards about its fixed pivot attachment point  34  towards the feet of the driver of the vehicle. The limit of adjustment is reached when the pivot shaft  26  reaches the end of the straight slots  24   d  and  24   e.  It is expected that an electrical switch (not shown) will be conveniently mounted within the reach of the driver of the vehicle to activate/deactivate the gearbox and electric motor assembly of the adjuster mechanism of the preferred embodiment. With the modular unit described in the preferred embodiment the positional relationship established between the brake, accelerator/clutch pedals will be maintained throughout the completed cycle of the total available adjustment of the pedal system. Therefore all three pedals, including the clutch, if applicable, will move together in a rearward direction closer to the feet of the driver. If individual pedal adjustment is desired, it is foreseeable that individual adjustable mechanisms may be provided for each pedal according to the disclosed invention to provide individual pedal adjustment, as desired. 
     The pedal system  10 , as heretofore described, involves only a pair of pedals, namely the brake pedal  12  and the accelerator pedal  16 , and, as such, is suitable for use in an automobile with an automatic transmission. If desired, however, the pedal system  10  can be adapted for use in automobiles with manual transmissions, in which case the pedal system must also function to adjust the position of a clutch pedal while adjusting the positions of the brake and accelerator pedals. Such an arrangement is illustrated in FIG. 4, where a clutch pedal  42  is shown as being attached to the lowermost end of a clutch pedal arm  44 , both of which are shown in broken line. An uppermost end of the clutch pedal arm  44 , in turn, is pivotally attached to the pivot shaft  26  at a location external to the leg  24   a  of the bracket  24 . 
     FIGS. 5-7 represent an adjustable pedal assembly in accordance with an alternate embodiment of this invention. The same reference numerals are used to represent identical or similar components of the preferred embodiment of FIGS. 1-4. However, this embodiment utilizes a pushrod support mounting bracket  60  fixed between the two legs  24   a  and  24   b  of the “U” shaped bracket so that a pivot shaft  70  is confined completely between the two legs  24   a  and  24   b  of the “U” shaped bracket  24 . The pushrod support mounting bracket  60  carries a pushrod support bearing  62  in which the pushrod is securely mounted. By providing support of the pushrod  20  with the pushrod support mounting bracket  60  the pivotable clevis housing  28  and associated pivot shaft  70  is guided during its adjustment stroke by the opposing legs  28   a  and  28   b  sliding between the opposing legs  24   a  and  24   b  of the “U” shaped bracket. The uppermost portion of the accelerator pedal adjustment link  32  has been mounted to the pivot shaft  70  between the opposing legs  24   a  and  24   b  as shown in FIG. 5 instead of outside of the leg  24   b  of FIG. 3, to enable the use of a shortened pivot shaft  70  and thereby eliminate the need for any slots in the legs  24   a  and  24   b  of the “U” shaped bracket  24 . 
     If it was required that the modular adjustable pedal system described in the embodiment of FIGS. 5-7 also adjust a clutch pedal, it would simply be mounted to an extended pivot shaft  70   a  outside of the “U” shaped bracket  24  so as to provide adjustment to the clutch simultaneous with the brake and accelerator pedals. 
     In operation, the alternate embodiment of FIGS. 5-7 operates the same as the preferred embodiment of FIGS. 1-4 except that since there are no slots in the legs  24   a  and  24   b  of the “U” shaped bracket  24 , the legs  24   a  and  24   b  themselves become a guide for the pivotable clevis housing  28  to oscillate therewithin as the adjustment screw is driven by the gear box/motor assembly from a fully rearward position (pedals in the most forward position) to a fully extended position (pedals in the most rearward position) closer to the driver. The pivot attachment with the pushrod securely supported within the pushrod support bearing  62  mounted in the pushrod support mounting bracket  60  provides a fixed pivot about which the brake pedal arm rotates to adjust from a fully forward to a fully rearward position close to the driver of the vehicle. 
     A significant advantage of the adjustable device of the present invention is that by selectively energizing the gearbox and drive motor assembly  38  the pivotable clevis housing  28  is oscillatable in a fore and aft position to select an optimal fore or aft position of the brake pedal arm  14  relative to the needs of the driver. Consequently, not only can the driver adjust the driver&#39;s seat to position himself or herself relative to the pedals, but the driver can also adjust the pedals themselves such that they are positioned to provide optimal comfort to the driver. The use of the invention may result in significant simplification of seat adjuster mechanisms since the function of providing adjustment of the seat to enable reaching the pedals need no longer be considered. With this invention the control pedals will be pivotably adjustable towards the seat. 
     In addition, where all of the automobile&#39;s control pedals, namely, the brake, clutch and accelerator pedals, are provided with the adjustment device of the present invention, each control pedal can be adjusted individually or collectively so as to provide optimal positioning of the control pedals for the particular physique of the driver. The brake, clutch, and accelerator pedals of the adjustable pedal system can be controlled by a single electronic device (not shown) which appropriately adjusts the individual control pedals according to a single command initiated by the driver. Also, as explained in the preferred embodiment, a single gearbox and electronic motor assembly  38  can be used to rotate, simultaneously, each of the brake, clutch, and accelerator pedals to be accessible to the driver. Such an electronic device can easily be mounted on the instrument panel of the automobile. 
     Another significant advantage of the present invention is that the metal to metal contact is assured throughout the components to provide positive actuation between the brake pedal arm and the master cylinder pushrod at all times, without the need for significant additional structure. The brake pedal arm is pivotably secured to the sleeve which through bearings is mounted to the pivot shaft such that the adjustment of the pivot shaft housing, also mounted to the pivot shaft, maintains a metal to metal contact between the brake pedal arm and the master cylinder pushrod so no external elements are needed to bias the brake pedal arm to ensure continued contact with the master cylinder pushrod. Further, there is no movement of the pushrod relative to the pushrod&#39;s corresponding master cylinder during adjustment of the control pedal since the pushrod is securely mounted in a mounting bracket with appropriate pushrod support bearings, thereby preventing the control pedal&#39;s adjustment mechanism from affecting operation of the pushrod during adjustment. 
     In addition, the advantage of the adjustment device can be realized with minimal additional hardware, and can be readily adapted to a conventional automobile pedal system. Accordingly, excessive space beneath the instrument panel is not required to accommodate the adjustment device, nor is there a significant penalty in terms of added weight. 
     Accordingly, the present invention provides an automobile control pedal adjustment system that is readily adaptable to conventional automobile control pedals for selective adjustment of the control pedals relative to the driver&#39;s seat, supplementing the adjustment capability conventionally provided with a driver&#39;s seat. The control pedal adjustment device can be actuated with the switch conveniently located on the instrument panel to position the control pedals according to the desires of the specific driver. The adjustment device can be electrically operated and can be provided with controls that are integrated with the central control module of the automobile to provide a memory capability, allowing several drivers to store a preselected control pedal position that can be recalled. 
     Because of the extension and retraction of the pivotable clevis housing  28  due to the linear travel of the pivot shaft  26  in the slot  32   a,  the gearbox and motor mounting plate will slightly change its angular relationship between the most forward position of the pivot shaft  26  as shown in FIG. 1, and its most rearward position, as shown in FIG.  2 . The purpose of the spherical dimple is to permit this reorientation with minimum frictional consequences so as to have little or no effect on the adjustable features of the mechanism. 
     While the invention has been described in terms of a preferred embodiment, it is apparent that other forms could be adopted by one skilled in the art. For example, it is contemplated that the motor/gearbox/actuator assembly can be replaced with a Bowden wire cable assembly in order to allow adjustment to be made manually if desired. Accordingly, the scope of the invention is to be limited only by the following claims: