BRAKE PEDAL APPARATUS FOR AUTOMOTIVE VEHICLE

Abstract: A brake pedal apparatus for an automotive vehicle is disclosed as including a pedal bracket 2, a pivot bracket 3, a slide plate 9 fixedly secured to a vehicular body structural member 41, 52, and an impact absorbing section 10 located between the pedal bracket and the slide plate. During a frontal collision of a vehicle, the impact absorbing section allows the pedal bracket to be contracted and deformed into a position wherein a pedal arm 8 is retracted in a forward direction of the vehicle whereby even when a master vac. is retracted in the forward direction or even when a dash floor panel 40 is deformed into a vehicle compartment with a resultant rearward movement of a push rod 24, a depressing position of the pedal arm remains in a position to avoid a differential feeling touch to be applied to a vehicle driver.

Description: DESCRIPTION BRAKE PEDAL APPARATUS FOR AUTOMOTIVE VEHICLE TECHNICAL FIELD The present invention relates to brake pedal apparatuses for automotive vehicles and more particularly to an improvement over the brake pedal apparatus for an automotive vehicle. BACKGROUND ART In recent years , various improvement workhas been undertaken to provide a brake pedal apparatus , one typical example of which is disclosed in Japanese Utility Model Provisional Publication No. 6-1113. In such a brake pedal apparatus, a pedal bracket, which pivotally supports an upper portion of a pedal arm, is fixedly connected to a dash floor panel and a lower portion of adashupperpanel connectedto thedashfloorpanelandprotruding into a vehicle compartment, with depression of the pedal arm allowing a push rod, which is connected to an upper portion of the pedal arm, to move forward to render a master vac. operative. DISCLOSURE OF INVENTION In a structure of the brake pedal of the related art, in the event the master vac. or the dash floor panel, to which the master vac. is fixed, are deformed and moved rearward in the vehicle compartment during a frontal collision of the vehicle, the pedal arm encounters a rotational motion in a direction opposite to a depressing direction of the pedal arm via the push rod of the master vac. , with a depressive position of the brake pedal being dislocated from its usual position to an undesired uncomfortable position to provide a differential feeling touch to a vehicle driver. The present invention has been made in view of the above-described inadequacies of the related art andhas an object to provide a brake pedal apparatus for an automotive vehicle wherein a pedal arm is prevented from being subjected to impact load through apush rodof amastervac . during afrontal collision of the automotive vehicle for thereby avoiding a differential feeling touch to be given to a vehicle driver. It is another object of the present invention to provide It is another object of the present invention to provide a brake pedal apparatus for an automotive vehicle which can provide an improved assembling work efficiency by ensuring a slide plate and a pivot bracket to be held in engagement with one another to provide an ease of transfer of the brake pedal assembly prior to assembling step thereof to the automotive vehicle . According to a first aspect of the present invention, there is provided a brake pedal apparatus for an automotive vehicle having a dash floorpanel and a vehicular body structural member, which comprises a pedal bracket fixedly secured to a dash floor panel and at a coupling position to a lower wall portion of a vehicular body structural member and carrying thereon a pivot shaft, a pivot bracket pivotally supported on the pivot shaft and having a pedal shaft, a pedal arm pivotally supported on the pedal shaft , a slide plate held in slidable engagement with the pedal bracket, and an impact absorbing section located between the coupling position and the pivot shaft to permit a relative movement of at least the pivot shaft and the lower wall portion of the vehicular body structural member in a fore and aft direction of an automotive vehicle for thereby absorbing an impact energy when the pedal bracket encounters an impact force exerted rearward in avehicle compartment at a level beyond a given load such that when the pivot shaft and the coupling position are moved in a contracted condition relative to one another, the pivot bracket disengages from the slide plate to allow the pivot bracket to rotate counterclockwise about the center of the pivot shaft . According to a second aspect of the present invention, there is' provided a brake pedal apparatus for an automotive vehicle having a dash floor panel and avehicular body structural member, which σomprises a pedal bracket fixedly secured to a dash floor panel and at a coupling position to a lower wall portion of a vehicular body structural member and carrying thereon a pivot shaft , a pivot bracket pivotally supported on the pivot shaft and having a pedal shaft, a pedal arm pivotally supported on the pedal shaft , a slide plate held in slidable engagement with the pedal bracket, and an impact absorbing section located between the coupling position and the pivot shaft to permit a relative movement of at least the pivot shaft and the lower wall portion of the vehicular body structural member in a fore and aft direction of an automotive vehicle for thereby absorbing an impact energy when the pedal bracket encounters an impact force exerted rearward in avehicle compartment at a level beyond a given load such that when the pivot shaft and the coupling position are moved in a contracted condition relative to one another, the pivot bracket disengages from the slide plate to allow the pivot bracket to rotate counterclockwise about the center of the pivot shaft . A releasable connecting section is locatedfor coupling at least the slideplateandthepivot bracket to one another and operative to release a coupling state between the slide plate and the pivot bracket when the pedal bracket encounters the impact force exerted rearward at the level beyond the given load. With sucha structure, thepresence of the slideplatearranged to restrict a pivotal movement of the pivot bracket in a normal condition of the vehicle allows a pedal arm to rotate about a center of a pedal shaft to enable a master vac. to be performed in a normal operation via a push rod coupled to the pedal arm. During af ontalcollisionof thevehicle, the shockabsorbing section functions to allow the coupling position, between the slide plate and the lower wall portion of the vehicular body structural member, to be retracted relative to the pivot shaft to cause the pivot bracket to disengage from the slide plate for thereby allowing the pivot bracket to pivotally rotate in the counterclockwise direction about the center of the pivot shaft such that the depressing position of the pedal arm is retracted in the forward direction of the vehicle. Consequently, even when the master vac. is moved in the rearward direction of the vehicle or even when the dash floor panel is deformed toward the vehicle compartment to move the push rod of the master vac. in the same direction, it is possible to avoid the depressing position of the pedal arm from dislocating rearward to suffer a differential feeling touch to be given to a vehicle driver. Further, the presence of the releasable connecting section which couples the pedalbracket andthe slideplate to one another and whish is operative to to release the coupling state between the pedal bracket and the slide bracket responsive to the impact force exerted to the pedal bracket rearward in the vehicle at the given load exceeding the given load renders the slide plate and the pedal bracket to be held stationary to restrict the same from moving relative to one another under the condition below the given load. Thus, it is possible for the slide plate and the pivot bracket to be held in engagement with one another during an assembling step or a transferring step of the associated component parts . According to a third aspect of the present invention, there is provided a brake pedal apparatus for an automotive vehicle having a dash floor panel and a vehicular body structural member, which comprises a pedal bracket fixedly secured to a dash floor panel and at a coupling position to a lower wall portion of a vehicular body structural member and carrying thereon a pivot shaft , a pivot bracket pivotally supported on the pivot shaft and having a pedal shaft a pedal arm pivotally supported on the pedal shaft, a slide plate held in slidable engagement with the pedal bracket, and an impact absorbing section located between the coupling position and the pivot shaft to permit a relative movement of at least the pivot shaft and the lower wall portion of thevehicularbody structuralmember in afore andaft direc ion of an automotive vehicle for thereby absorbing an impact energy when the pedal bracket encounters an impact force exerted rearward in a vehicle compartment at a level beyond a given load such that when the pivot shaft and the coupling position are moved in a contracted condition relative to one another, the pivot bracket disengages from the slide plate to allow the pivot bracket to rotate counterclockwise about the center of the pivot shaft. A restrictor section is located at the coupling point for engagingwith apart of the pivot bracket torestrict apivotal movement thereof in a counterclockwise direction under a condition where the pedal bracket remains in a normal position relative to the vehicular body structural member, the restrictor section being operative to move with the vehicular body structural member relative to the part of the pivot bracket when thepedal bracket encounters the impact force exceeding the given load exerted in the rearwarddirection of the automotive vehicle . With sucha structure, thepresence of therestrictor section, which restricts the pivotal movement of the pivot bracket in engagement with the slide plate during a normal cruising state of the vehicle, allows the pedal arm to rotate about the center of the pedal shaft to cause a master vac. to be performed in a normal operation via a push rod coupled to the pedal arm. During afrontal collision of thevehicle, the shockabsorbing section functions to allow the coupling position, between the slide plate and the lower wall portion of the vehicular body structural member, to be retracted relative to the pivot shaft to cause the pivot bracket to disengage from the slide plate for thereby allowing the pivot bracket to pivotally rotate in the counterclockwise direction about the center of the pivot shaft such that the depressing position of the pedal arm is retracted in the forward direσtion of the vehicle . Consequently, even when the master vac. is moved in the rearward direction of the vehicle or even when the dash floor panel is deformed toward the vehicle compartment to move the push rod of the master vac. in the same direction, it is possible to avoidthe depressing position of the pedal arm from dislocating rearward to suffer a differential feeling touch to be given to a vehicle driver. Further, the presence of the restrictor section allows the part of the pivot bracket to be engageable with the coupling fixture member, which forms the restrictor section, for preventing the pivot bracket from rotating in the countercloσkwise direσtion about the center of the pivot shaft to minimize the amount of variation in the depressing position of the pedal to alleviate a differential feeling touch to be given to a vehicle driver. Further, when the pedal arm encounters the impact force beyond the given load in the rearward direction of the vehicle, the restrictor section is shifted with the vehicular body struσtural member relative to the pivot shaft, thereby avoiding the pivot bracket from being disturbed for its pivotal movement. According to a fourth aspect of the present invention, there is provided a brake pedal apparatus for an automotive vehicle having a dash floor panel and a vehicular body structural member, which comprises a pedal bracket fixedly secured to a dash floor panel and at a coupling position to a lower wall portion of a vehicular body structural member and carrying thereon a pivot shaft, a pivot bracket pivotally supported on the pivot shaft and having a pedal shaft, a pedal arm pivotally supported on the pedal shaft, a slide plate held in slidable engagement with the pedal bracket , and impact absorbing means allowing at least the pivot shaft and the lower wall portion of the vehicular body structural member to move relative to one another in a fore and aft direction of an automotive vehicle for thereby absorbing an impact energy when the pedal bracket encounters an impact force exerted rearward in avehicle compartment at a level beyond a given load such that when the pivot shaft and the coupling position are moved in a contracted condition relative to one another, the pivot bracket disengages from the slide plate to allow the pivot bracket to rotate counterclockwise about the center of the pivot shaft . According to a fifth aspect of the present invention, there is provided a brake pedal apparatus for an automotive vehicle having a dash floorpanel and avehicularbody structural member, which comprises a pedal bracket fixedly secured to a dash floor panel and at a coupling position to a lower wall portion of a vehicular body structural member and carrying thereon a pivot shaft, a pivot bracket pivotally supported on the pivot shaft and having a pedal shaft, a pedal arm pivotally supported on the pedal shaft , a slide plate held in slidable engagement with the pedal bracket, impact absorbing allowing at least the pivot shaft and the lowerwall portion of thevehicular body structural member to move relative to one another in a fore and aft direction of an automotive vehicle for thereby absorbing an impact energy when the pedal bracket encounters an impact force exerted rearward in a vehicle compartment at a level beyond a given load such that when the pivot shaft and the coupling position are moved in a contracted condition relative to one another, the pivot bracket disengages from the slide plate to allow the pivot bracket to rotate counterclockwise about the center of the pivot shaft, and releasable connecting means coupling at least the slide plate and the pedal bracket to one another and operative to release a coupling state between the slide plate and the pedal bracket when the pedal bracket encounters the impact force exerted rearward at the level beyond the given load. According to a sixth preferred embodiment of the present invention, there is provided a brake pedal apparatus for an automotive vehicle having a dash floor panel and a vehicular body structural member, which comprises a pedal bracket fixedly secured to a dash floor panel and at a coupling position to a lower wall portion of a vehicular body structural member and carrying thereon a pivot shaft, a pivot bracket pivotally supported on the pivot shaft and having a pedal shaft, a pedal arm pivotally supported on the pedal shaft, a slide plate held in slidable engagement with the pedal bracket, impact absorbing means allowing at least the pivot shaft and the lowerwall portion of the vehicular body structural member to move relative to one another in a fore and aft direσtion of an automotive vehicle for thereby absorbing an impact energy when the pedal bracket encounters an impact force exerted rearward in a vehicle compartment at a level beyond a given load such that when the pivot sha t and the coupling position are moved in a σontraσted condition relative to one another, the pivot bracket disengages from the slide plate to allow the pivot bracket to rotate counterσloσkwise about the σenter of the pivot shaft, and restriσtor means restriσting a pivotal movement thereof in a countercloσkwise direction under a condition where the pedal braσket remains in a'normal position relative to the vehiσular body structural member, the restrictor section being operative to move with the vehicular body structural member relative to the part of the pivot bracket when the pedal bracket encounters the impaσt force exceeding the given load exerted in the rearward direσtion of the automotive vehiσle. Other and further features, advantages, and benefits of the present invention will beσome more apparent from the following description taken in con unσtion with the following drawings . BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a perspeσtive, exploded view of a first preferred embodiment of a brake pedal apparatus according to the present invention; FIG. 2 is a side, cross sectional side view of an essential the brake pedal apparatus shown in FIG. 1 ; FIG.3 is a perspective, exploded view of a second preferred embodiment of a brake pedal apparatus according to the present invention; FIG. 4 is a side, cross sectional side view of the brake pedal apparatus shown in FIG. 3; FIG. 5 is a side, cross sectional view of a third preferred embodiment of a brake pedal apparatus according to the present invention; FIG.6 is a bottom view of the brake pedal apparatus as viewed in an arrow VI in FIG. 5; FIG. 7 is a side, cross seσtional view of a fourth preferred embodiment of a brake pedal apparatus aσcording to the present invention; FIG.8 is a bottom view of the brake pedal apparatus as viewed in an arrow VIII in FIG. 7; FIG.9 is a cross sectional view of the brake pedal apparatus taken on line IX-IX of FIG. 7; FIG.10 is a perspective, exploded view of a fifth preferred embodiment of a brake pedal apparatus according to the present invention; FIG. 11 is a side, cross sectional side view of an essential part of the brake pedal apparatus shown in FIG. 10; FIG. 12 is a bottom view of the brake pedal apparatus as viewed in an arrow XII shown in FIG. 11; FIG. 13 is a partially cut away, perspective view of an essential part of a sixth preferred embodiment of a brake pedal apparatus according to the present invention; FIG. 14 is a cross sectional side view of the brake pedal apparatus incorporating the essential part shown in FIG. 13; FIG.15 is a cross sectional side view of a seventh preferred embodiment of a brake pedal apparatus acσording to the present invention, with the brake pedal apparatus being shown in its normal condition; FIG. 16 is a cross sectional side view of the brake pedal apparatus according to the present invention, with the brake pedal apparatus being shown in an operative σondition during a σollision of a vehicle; FIG. 17 is a cross sectional side view of the brake pedal apparatus according to the present invention for illustrating the operation of restricting apivotalmovement of apivot braσket in the normal condition; FIG. 18 is an enlarged σross seσtional view of an essential part of the brake pedal apparatus shown in FIG. 15; and FIG. 19 is an enlarged cross sectional view of an essential part of a modified form of the brake pedal apparatus shown in FIG. 15. BEST MODE FOR CARRYING OUT THE INVENTION To describe the present invention more in detail , a preferred embodiment of the present invention will be explained with referenσe to the drawings below. Referring now to FIGS .1 and 2 , there is shown a brake pedal apparatus 1 for an automotivevehicle of the preferred embodiment according to the present invention. The brake pedal apparatus 1 includes apedalbracket 2whichhas apairofoutwardlyextending flange portions 2C firmly fixed to a dash floor panel 40 of a dash panel formed in a front portion of the automotive vehiσle by bolts and nuts (not shown). The pedal braσket 2 has a pair of downwardly extending side wall portions 2A, 2A which are laterally spaσed from one another and are interσonneσted at their upper ends with an upper flat wall portion 2B, thereby forming a substantially C-shaped configuration in cross section. The upper wall portion 2B has a pair of longitudinally extending elongated openings 15, 15 formed in the vicinity of respective forward end portions, and a central elongated bolt insertion slot 10 formed in a longitudinal direction of the pedal bracket 2. The elongated bolt insertion slot 10 functions as an impact absorbing section which maintains the pedal bracket 2 in a first position shown in FIG. 2 during a normal cruising of the automotive vehicle and in a seσond position during a frontal σollision of the automotive vehicle, in a manner as will be desσribed below in detail. A substantially flat, slide plate 9 is placed over the upper wall portion 2B of the pedal bracket 2 and firmly fixed to a lower wall of a vehicular body structural member 41 extending upward and rearward of the dash floor panel 40. In the first illustrated embodiment, the slide plate 9 has a downwardly opening, substantially C-shaped cross section having an upper wall 9A formed at its both sides with laterally spaced, downwardly extending flanges 9B, 9B which are covered over the upper wall portion 2B of the pedal braσket 2. A rear distal end of the upper wall portion 9A of the slide plate 9 has a bolt insertion hole 11 and a substantially medium portion of the slide plate 9 has a pair of laterally spaced, elongated slots 16, 16 formed in the vicinity of a forward end portion 18 (i.e., an engaging portion) of the upper wall 9A. In particular, a rear end portion of the upper wall portion 9A of the slide plate 9 is firmly connected to a lowerwall portion of a mounting bracket 44 whose upper end is in turn conneσted to abracket 43 coupledtoasteeringmember42. More specifically, the rear end portion of the slide plate 9 is sandwiched between the lower wall of the mounting bracket 44 and the upper wall portion 2B of the pedal bracket 2, and a nut plate 13, to which a nut 14 is firmly conneσted by welding, is loσated on a lower surfaσe of the pedal braσket 2. A σoupling fixture member such as a bolt 12 is inserted through a bore (not shown) of themounting bracket 44, the bolt insertion hole 11 of the slide plate 9 and the bolt insertion slot 10 of the pedal bracket 2, and is screwed into the nut 14 to fixedly secure the rear end portions of the slide plate 9 and the pedal bracket 2 to the lower wall portion of the mounting bracket 44. In the first illustrated embodiment, further, the steering member 42 , the bracket 43 and the mounting bracket 44 form the vehicular body structural member 41. A pivot bracket 3 , which has an upwardly opening, substantially C-shaped configuration in cross section, has a collar 5 which is pivotally supported on a pivot shaft 4 mounted to the pedal bracket 2. The pivot bracket 3 has a laterally spaced sideplateportions 3A, 3Awhiσh σarryapedal shaft 6 at aposition forwardly of the pivot shaft 4 in a lengthwise direσtion of the vehicle, with the pedal shaft 6 pivotally supporting a pedal arm 8 by means of a collar 7. The pivot bracket 3 includes upwardly extending projective segments 17, 17 which are spaced from one another in a lateral direction and extend through the elongated openings 15,15 of the pedal bracket 2 and the elongated slots 16,16 of the slide plate 9, respectively. The projective segments 17,17 function to normally engages with the slide plate 9 at the respective forward end portions 18,18 of the slide plate 9 to remain in a first engagement position, wherein the pedal bracket 2 remains in its first position, and is operative to disengage from the slide plate 9 to assist pivotal movement of the pivot braσket 3 such that the pedal bracket 2 is brought into a second, disengagement position. In the first illustrated embodiment, the provision of the elongated bolt insertion slot 10 formed in the pedal bracket 2 provides the impact absorbing section which is operative to allowthepivot shaft 4 andalowersurfaceportionof thevehicular body structural member 41 to move relative to one another in forward and aft direσtions of the vehiσle when the pedal braσket 2 enσounters an external, impaσt forσe applied in a rearward direσtion of the vehicle at a load exσeeding a given level during a frontal σollision of the automotive vehiσle. As previously noted above, since the upper wall portion 2B of the pedal bracket 2 has the pair of elongated openings 15, 15 and the upper wall 9A of the slide plate 9 has the pair of elongated slots (opening sections) 16, 16, with the elongated openings 15, 15 andthe elongated slots 16 , 16 admit theprojeσtive segments 17, 17, of the pivot bracket 3 to pass. With such an arrangement, cutout portions 19, 19 which are formed at forward distal ends of the respective projective segments 17, 17 of the pivot braσket 3 and whiσh serve as engaging portions , are held in engagement with the forward end portions (i.e., the engaging portions) 18, 18 of the slide plate 9. A releasable αonneσting section 20 is provided for interconnecting the pedal bracket 2 and the slide plate 9 while, when the pedal bracket 2 encounters the external force exerted in the rearward direction at the load exceeding the given level, releasing the interconnecting relationship between the pedal bracket 2 and the slide plate 9 for thereby absorbing an impact energy applied to the pedal bracket 2.. In the first illustrated embodiment, the releasable connecting section 20 is constructed of a shear pin 23 which passes through bores 21 and 22 formed in the upper wall portion 2B of the pedal bracket 2 and the upper wall 9A of the slide plate 9, respectively. Also it is to be noted that the shear pin 23 is generally made of softer material (i.e. , for example, plastic resin or aluminum) than the pedal bracket 2 and the slide plate 9. Further, the releasable conneσting seσtion 20 is preferably located in the vicinity of an engagement section between the front edge portion 18 of the slide plate 9 and the cutout portions of the pivot bracket 3. More specifiσally, in the first preferred embodiment, the releasable conneσting seσtion 20 is loσated in a position slightly forwardly of the aforementioned engagement section in alignment with an extending line of the bolt insertion slot 10 formed in the elongated profile. During normal cruising of the vehiσle σorresponding to a non-collision state, consequently, sinσe the forward end portions 18, 18 of the slide plate 9 is held in engagement with the σutout portions 19, 19 formed at the front edge portions of the pivot braσket 3 , counterclockwise pivotal movement of the pivot braσket 3 is restriσted to allow a depressing position of the pedal arm 8 to be restriσted within a given range such that the pedal arm 8 is rotated about the center of the pedal shaft 6, thereby allowing a push rod 24 conneσted to the pedal arm 8 to aσhieve a usual master vac. operation without σausing any differential touσh to be felt by the vehiσle driver. During frontal collision of the vehicle, further, the pedal bracket 2 is moved in the rearward direction of the automotive vehiσle relative to thebolt insertion slot 10 of thepedalbraσket 2, whiσh forms the impaσt absorbing section, while shearing the shearing pin 23 of the releasable connecting section 20 , thereby causing the pedal bracket -2 to encounter contraction and deformation owing to the rearward movement of the pedal bracket 2. With such a contraσtion and deformation, sinσe the slide plate 9 fixed to the vehiσular body structural member 41 is guided by the upper wall portion 2B of the pedal bracket 2 and is moved in the forward direction relative to the pivot braσket 3 , the pivot bracket 3 disengages from the slide plate 9 to allow the pivot bracket 3 to pivotally rotate counterclockwise about the center of the pivot shaft 4 to the second position such that the depressible position of the pedal arm 8 is retracted in the forward direction of the automotive vehicle. That is , when the pedal shaft 6 of the pedal arm 8 is moved in the rearward direction of the automotive vehicle, the depressible position of the pedal arm 8 is shifted in the forward direction, i.e., to a new depressing position. In the first illustrated embodiment, as discussed above, since the slide plate 9 is operative to restrict the pivotal motion of the pivot bracket 3 during the normal cruising state of the automotive vehicle, it is possible for the pedal arm 8 to rotate about the center of the pedal shaft 6 to perform the normal master vac. operation via the push rod 24 connected to the pedal arm 8. On the one hand, when the automotive vehicle enσounters the frontal σollision, the pivot shaft 4 of the pivot braσket 3 is moved in σontraσtive motion toward the fixed area between the slide plate 9 and the lower end wall of the vehicular body structural member 41 to allow the pivot bracket 3 to disengage from the slide plate 9 and to rotate the pivot bracket 3 countercloσkwise about the center of the pivot shaft 4 such that the depressing position of the pedal arm 8 is retracted toward the front side of the automotive vehicle. As a result, even when the master vac . encounters rearward movement or when the dash floor panel 40 is deformed toward the vehicle compartment and the pushrod 35 of themastervac . is movedrearward, it is possible for the depressing position of the pedal arm 8 to be prevented fromdislocatingrearwardto cause the differential feelingtouch to be applied to the vehicle driver. Further, the presence of the releasable connecting section 20, which is composed of the pedal bracket 2, the bore 21 of the upper wall portion 2B of the pedal bracket 2 , the slide plate 9, the bore 22 of the upper wall portion 9A of the slide plate 9 and the shear pin 23, renders the slide plate 9 and the pedal bracket 2 to be restricted from moving relative to one another to remain in the first position until the slide plate 9 is exerted with the external, impact force beyond the given load and to be operative to release the connecting relationship between the slide plate 9 and the pivot bracket 2 to σause the pivot braσket 2 to move to the seσond position responsive to the external force exceeding the given load exerted to the pedal bracket 2 in the rearward direction of the automotive vehicle. Thus, it is possible for the slide plate and the pivot bracket 3 to be held in engagement with one another during their assembling work or their transfer of the assoσiated σomponent parts . In the first illustrated embodiment, further, the provision of the releasable σonneσting seσtion 20 loσated in σlose proximity to the engaging area between the pivot braσket 3 and the slide plate 9 allows the slide plate 9 to be restriσted from moving at the engagement area, thereby ensuing a reliable engagement relationship between the pivot bracket 3 and the slide plate 9. Also, since the releasable connecting section 20 is located forwardlyof theaforementionedengagement areabetweenthepivot braσket 3 and the slide plate 9 in the longitudinal direσtion of the automotive vehiσle, the shear pin 23 of the releasable σonnection section 20 is enabled to be loσated in an area, whiσh has a relatively wide margin, not to disturb the releasing movement of the slide plate 9, i.e. , the area defined forwardly of the elongated bolt insertion slot 10 formed in the upper wall 2B of the pedal braσket 2. Thus , there is no need or inσreasing the size of the pedal braσket 2, affording the σontribution to the σompaσtness of the brake pedal unit 1. In addition, since themargin, inwhiσhthe shearpin 23 is loσated, has therelatively wide area, the bolt insertion slot 10 may have a longitudinal length as long as possible. Further, in a general assembling sequenσe of the brake pedal apparatus 1, although it is a usual practiσe to assemble the pivot shaft 4 to the pedal braσket 2 and subsequently to σouple the pedal braσket 2 with the slide plate 9. , the interferenσe between a subassembly of the pedal bracket 2 and the slide plate 9 and other remaining component parts σan be effectively avoided to improve the assembling work efficiency even in a case where the slide plate 9 is coupled to the pedal bracket 2 in the coupling work performed in upward and downward orientations without the use of ariveting technique which enables the slide plate 9 to be coupled to the pedal bracket 2 in a single directional orientation. Sinσe, further, the pedal bracket 2 has the C-shaped configuration in cross section having the pair of the side walls 2A, 2A between which the upper wall portion 2B is integrally formed toallowthe releasable connecting section 20 to be loσated, and has the longitudinally extending openings 15, 15 through whiσh the projective segments 17,' 17 extend, respectively, to allow the cutout portions 19, 19 of the pivot bracket 3 to be held in engagement with the slide plate 9, it is possible for the height of a region around the pivot shaft 4, whiσh enables the pivot braσket 3 to be supported by the pedal braσket 2 for the pivotal movement, to be restricted in a limited range to prevent the increase in thewhole size of thebrakepedalapparatus 1. This results in an increased freedom in the layout in designing the brake pedal apparatus 1, enabling a wide application of the same to various models of the smaller-sized automotive vehicles . Sinσe, also, the upper wall portion 2B of the pedal bracket 2 and the slide plate 9 are fixedly coupled to the lower wall portion of the vehicle structural member 41 by means of the bolt (i.e. , the coupling fixture member) 12 inserted from an upward area in the automotive vehicle, and, as the impact absorbing section, the bolt insertion slot 10 is formed in the elongated profile in the upper wall portion 2B of the pedal bracket 2 to allow the pedal bracket 2 and the slide plate 9 to move relative to one another, the brake pedal apparatus 1 can be constructed in a simplified structure with a reduced σost. In addition, the management in a σoupling torque of the bolt 12 provides an ease of tuning for the impaσt absorption. In the first illustratedembodiment, further, since thepedal bracket 2 andthe slideplate 9 arefixedlycoupledto thevehicular body struσtural member 41 by inserting the bolt 12 from the upward area in the automotive vehiσle, it is possible to fixedly secure the brake pedal device 1 in which the pedal bracket 2 and the pedal arm 8 are preliminarily assembled, to the dash floor panel 40 and subsequentlytomount amodule , wherein the steeringmember 42 is connected to the bracket 43, which in turn is connected to the mounting bracket 44 , and is conneσted to a steering column shaft (not shown) , to a suitable position at once from a rearward area in the automotive vehicle , thereby improving the assembling work efficiency. Furthermore, the presence of the releasable σonnecting section 20 located on the line extending rom the bolt insertion slot 10 formed in the upper wall portion 2B of the pedal bracket 2 in the longitudinally extending elongated profile allow the slide plate 9 to move in a stable fashion without causing its deflection during the movement of the pedal bracket 2 and the slide plate 9 relative to one another. In addition, since the slide plate 9 is located on the upper wall portion 2B of the pedal bracket 2 in an overlapping relationship, the layout of the slide plate 9 is not adversely affected with the shaft 4, which is supported with the pedal bracket 2 , and the pivot bracket 3 , thereby enhancing the freedom in the layout of the slide plate 9. Moreover, since the slide plate 9 has the substantially C-shaped σonfiguration having the upper wall portion 9A and the pair of downwardly extending flanges 9B, 9B integral therewith to cover the upper wall portion 2B of the pedal bracket 2, the σross seσtional σoeffiσient of the slide plate 9 σan be freely seleσted to a suitable value by varying the vertiσal height of eaσh flange 9B so as to improve the rigidity of the slide plate 9 responsive to aninput loadinaneasyfashion . Thus , therigidity of the slide plate 9 σan be enhanced with the flanges 9B, 9B, therebyrendering the slideplate 9 tobemanufacturedina smaller size with a resultant decrease in the size of the brake pedal device 1 so as to be appliσable to the various models of the small-sized automotive vehiσles . Also, the presenσe of the downwardly extending flanges 9B, 9B formed in the slide plate 9 to σover the both sides of the upper wall portion 2B of the pedal braσket 2 allows the flanges 9B, 9B to serve as guides of the slide plate 9 during its longitudinal movement , thereby ensuring the stable movement of the slide plate 9. A second preferred embodiment of a brake pedal device 1 acσording to the present invention is desσribed with reference to FIGS. 3 and 4, with like or similar parts bearing the same reference numerals as those used in FIGS .1 and 2 to omit redundant desσription of the like parts for the sake of simpliσity. In the second pre erred embodiment shown in FIGS . 3 and 4 , the brake pedal apparatus 1 further inσludes a second releasable σonneσting section 25 which is construσted of the nut plate 13 and the pedal braσket 2. In partiσular, the seσond releasable connecting section 25 is arranged to interconnect the pedal bracket 2 and the nut plate 13 and to release the interconnecting relationship between the pedal bracket 2 and the nut plate 13 responsive to an external forσe, exerted the pedal braσket 2, exceeding a given load. More particularly, the second releasable connecting section 25 is construσted of a second shear pin 28 inserted through bores 26, 27 formed in a rearward end of the upper wall portion 2B of the pedal bracket 2 and a rearward end of the nut plate 13, respectivel . With such a structure of the second preferred embodiment of the present invention, in addition to the aforementioned advantages of the first preferred embodiment, the provision of the second releasable connecting section 25 arranged to interconnect the nut plate 13 to the pedal bracket 2 allows the nut plate 13 to be prevented from being subjected to a rickety movement prior to assembling the brake pedal apparatus 1 to the automotive vehicle. Since the bolt 12 is inserted from upward in a downward direction, the brake pedal apparatus 1 , whiσh inσludes the pedal braσket 2, etσ. , is fixed to the dash floor panel 40 and subsequently a module, which inσludes the braσket 43 and the mounting braσket 44 σonneσted to the steering member 42 whiσh forms part of the vehiσular body struσtural member 41 to which the slid plate 9 is fixed, can be mounted to a desired position from a rearward area in the forward direσtion of the automotive vehiσle at onσe without the need for implementing the σoupling work in a worker's σreep condition beneath the vehiσular body structural member 41 or the brake pedal apparatus 1, thereby improving the working effiσienσy for assembling the σomponent parts. A third preferred embodiment of a brake pedal apparatus 1 aσcording to the present invention is described below with referenσe to FIGS. 5 and 6, with like or similar parts bearing the same reference numerals as those used in FIGS. 1 and 2 and the redundant description of the like parts being omitted for the sake of simplicity. In the third preferred embodiment of FIGS.5 and 6 , the brake pedal apparatus further inσludes a seσond releasable connecting section 29 which interconneσts the pedal bracket 2, the slide plate 9 and the nut plate 13 to one another and which is operative to release the coupling relationship among the pedal bracket 2, the slide plate 9 and the nut plate 13 to allow these elements to move relative to one another when subjected to the external force exceeding a given load exerted in the rearward direction of the automotive vehicle. In particular, the seσond releasable σonneσting seσtion 29 inσludes a shear pin 28 whiσh is inserted through bolt insertion bores 26, 27, 28 formed in a rear distal end of the upper wall portion 2B of the pedal braσket 2 , a rear distal end of the upper • wall portion 9A of the slide plate 9 and a rear distal end of the nut plate 13, respectively. With such a structure of the third preferred embodiment, the presence of the second releasable connecting section 29, which normally keeps the pedal bracket 2, the slide plate 9 and the cut plate 13 in their first fixed position and is operative to release the σoupling state of these elements for thereby allowing these elements to move relative to one another responsive to an impaσt force exceeding the given load exerted to the pedal bracket 2, allows the pedal bracket 2 and the slide plate 9 to move relative to one another at a desired timing in a highly reliable manner while enabling the component parts of the releasable connecting seσtion 29 from suffering the rickety movement during assembling operation of these component parts. Further, since the bolt 12 is inserted in a vertical orientation from the upward area in the automotive vehicle to σouple the pedal bracket 2 to the mounting bracket 44, it is possible to firstly fix the brake pedal apparatus 1, whiσh involves the pedal braσket 2, etσ. , to the dash floor panel 40 and to seσondly assemble the braσket 43 and the mount braσket 44 to the steering member 42, whiσh forms part of the vehiσular body struσtural member 41, and, thereafter, to mount the brake pedal apparatus 1 to the mounting braσket 44 at one time in a longitudinal orientationfromtherearwardareaofthe automotive vehiσle, thereby improving the assembling work effiσiency of the brake pedal apparatus 1. FIGS .7 to 9 show a brake pedal apparatus of a forth preferred embodiment of the present invention, with like or similar parts bearing the same reference numerals as those used in FIGS. 1 and 2 for omitting the redundant description for the sake of simplicity. In the fourthpreferred embodiment , the brake pedal apparatus includes a second releasable conneσting seσtion 31 whiσh interconnects the slideplate 9 and thenutplate 13 to one another via the bolt insertion slot 10 formed in the upper wall portion 2B of the pedal bracket 2 in the elongated profile. More particularly, the second releasable conneσting seσtion 31 includes ashearpin 31whichis insertedthroughbolt insertion bores 30 and 27 formed in the upper wall portion 9A of the slide plate 9 and the nut plate 13 at respective positions forwardly of the bolt 12 and the nut 14 by whiσh the slide plate 9 is fixedly σonneσted to the lower surfaσe of the vehiσular body struσtural member 41, i.e., the mounting braσket 44. In the fourth preferred embodiment, as best seen in FIG. 7, the nut plate 13 is seleσted to have a lower thiσkness than the slide plate 9 and has an embossed portion 32 whiσh protrudes toward the slide plate 9 and whiσh forms part of the second releasable σonnecting section 31. The embossed portion 32 of the nut plate 13 is located in the elongated bolt insertion slot 10 formed in the upper wall portion 2B of thepedalbraσket 2 andisheldinabuttingengagement with a lower surface of the slide plate 9. With such a structure of the fourth preferred embodiment, the presence of the second releasable σonnecting seσtion 31, which interσonneσts the nut plate 13 to the slide plate 9 , allows the nut plate 13 from suffering the riσkety movement prior to assembling the brake pedal apparatus to the automotive vehiσle. Further, since the bolt 12 is inserted in the vertical orientation from the upward area in the automotive vehicle to couple the pedal bracket 2 to the mounting bracket 44, it is possible to firstly fix the brake pedal apparatus 1, which involves the pedal bracket 2, etc. , to the dash floor panel 40 and to secondly assemble the bracket 43 and the mount braσket 44 to the steering member 42, which forms part of the vehiσular body struσtural member 41, and, thereafter, to mount the brake pedal apparatus 1 to the mounting braσket 44 at one time in the longitudinal orientationfromtherearwardareaof the automotive vehiσle, thereby improving the assembling work effiσiency of the brake pedal apparatus 1. Further, sinσe the seαond releasable σonneσting seσtion 31 is loσated forwardly of the coupling portion composed of the bolt 12 and nut 14, whiσh interconnect the pedal bracket 2 and the slide plate 9 to the mounting bracket 44 of the vehicular body structural member 41, there is no need for preparing a specific mounting area for the bore to insert the shear pin at the position rearward of the coupling portion as required in the second releasable connecting seσtion 25 of the second preferred embodiment and the seσond releasable σonnecting section 29 of the third preferred embodiment, thereby enabling the brake pedal apparatus 1 to be manufactured in a small-size. Since, also, the second releasable σonneσting section 31 is arranged such that the slide plate 9 and the nut plate 13 are interconneσted to one another via the bolt insertion bore 10 having the elongated profile to allow the pedal bracket 2 to lie between the slide plate 9 and the nut plate 13 which are consequently held in the fixed place, it is possible for the slide plate 9 and the pedal bracket 2 from suffering the rickety movement prior to the assembling step of the brake pedal apparatus . Further, the absence of the need for the releasing operation of the coupling state of the pedal bracket 2 and the slide plate 9 allows an initial load, for which the relative movement of the slide plate 9 is initiated responsive to the impaσt forσe exerted to the pedal bracket 2 in the rearward direσtion of the automotive vehiσle at the level exceeding the given load, to be kept in a low level. In addition, the utilization of the bolt insertion bore 10 having the elongated profile provides the guide by which the slide plate 9 is moved relative to the pedal bracket 2 in a stable fashion. Also, during an initial transition period of the movement of the slide plate 9, sinσe there is no need for the shear pin 28 to be sheared while, at the same time, only the front shear pin 23 may be sheared, it is possible to lower the initial transition load to initiate the relative movement of the slide plate 9. Further, the distanσe through whiσh the relative movement of the slide plate 9 is performed is ensured to have an adequate value allows the nut plate 13 to be σoupled to the slide plate 9 iri the σoupling state with the normal pin when there is no need for shearing the shear pin 28 at the distal end of the elongated bolt insertion bore 10. Further, the embossed portion 32 has a profile wherein the frontal edge portion is slanted downward suσh that when the frontal edge portion of the embossed portion 32 is forσed to enter beneath the upper portion 2B of the pedal braσket 2 from the frontal edge of the elongated bolt insertion slot 10 during the late sliding period, the shear pin 28 is readily sheared and is easily removed from the slide plate 9 to be useful for thereleasingoperationof the secondreleasableconnectingmeans 31. Furthermore, since the nut plate 13 is selected to have a lower thickness than the slide plate 9 and the nut plate 13 is formed with the embossed portion 32, whiσh protrudes toward the slide plate 9 and whiσh forms part of the seσond releasable connecting section 31, the second releasable connecting section 31 can be fabricated in a simple fashion with a reduced σost with the use of the nut plate 13 having the reduσed thiσkness. That is, if the slide plate 9, whiσh has a large thiσkness to provide a required strength and rigidity, is tried to be formed with the embossed portion 32 whiσh protrudes toward the nut plate 13, although the bolt insertion slot 10 should have an increased width and longitudinal length in order to allow the embossed portion 32 to be loσated in the bolt insertion slot 10 of the upper wall portion 2B of the pedal bracket 2 to be brought into abutting engagement with the nut plate 13, the utilization of the nut plate 13 having the reduced thickness provides an ease of fabrication of the embossed portion 32 with a reduced flexural center, thereby permitting the size of the bolt insertion slot 10 to be formed in a relatively small value to contribute the σompaσtness of the brake pedal apparatus 1. Since, also, the embossed portion 32 of the nut plate 13 is located in the elongated bolt insertion slot 10 of the upper portion 2B ofthepedalbracket 2 andis heldinabuttingengagement with the lower surface of the slide plate 9 via the bolt insertion bore 10 , the bolt insertion slot 10provides theguide forenabling the slide plate 9 to move relative to the pedal bracket 2 in a stable fashion . A fifth preferred embodiment of a brake pedal apparatus 1 according to the present invention is desσribed with referenσe to FIGS. 10 to 11, with like or similar parts bearing the same referenσe numerals as those used in FIGS. 1 and 2 for omitting the redundant description for the sake of simplicity. In the fifth preferred embodiment, the brake pedal apparatus 1 includes a second releasable conneσting seσtion 31 which interconnects the slide plate 9 and the nut plate 13 to one another via the bolt insertion slot 10 formed in the upper wall portion 2B of the pedal bracket 2 in the elongated profile. More particularly, the second releasable connecting section 31 inσludes a shearpin 31whichis insertedthroughbolt insertion bores 30 and 27 formed in the upper wall portion 9A of the slide plate 9 and the nut plate 13 at respective positions forwardly of the σoupling position provided by the bolt 12 and the nut 14 by whiσh the slide plate 9 is fixedly σonneσted to the lower surfaσe of the vehiσular body struσtural member 41, i.e., the mounting bracket 44. A fifth preferred embodiment of a brake pedal apparatus 1 acσording to the present invention is desσribed below with reference to FIGS. 10 to 12, with like or similar parts bearing the same reference numerals as those used in FIGS. 1 and 2 and the redundant description of the like parts being omitted for the sake of simplicity. In the fifth preferred embodiment, the brake pedal apparatus 1 is identical in structure with the fourth preferredembodiment except forthesecondreleasable conneσting seσtion In the fifth preferred embodiment , the brake pedal apparatus 1 inσludes a second releasable connecting section 33 whiσh interσonneσts the slide plate 9 and the nut plate 13 via the elongated bolt insertion bore 10 formed in the upper wall portion 2B of the pedal braσket 2. In partiσular, the seσond releasable connecting section 33 is constructedof a shearpin 28whichis insertedthoughinsertion bores 30, 27 formed in the upper wall portion 9A of the slide plate 9 and the nut plate 13, respeσtively, at their respeσtive positions forwardly of the σoupling position provided by the bolt 12 and the nut 14 whiσh fixedly σouple the slide plate 9 to the lower surface of the vehicular body structural member 41 (i.e., the mounting bracket 44). In thefifthpreferredembodiment , thenutplate 13 is selected to have a lower thiσkness than the slide plate 9 and has a tongue-shaped segment 34 , which protrudes toward the slide plate 9 andwhichforms part of the secondreleasable conneσting seσtion 33. The tongue-shaped segment 34 is formed so as to extend from its forward distal end in a forward direσtion of the automotive vehiσle and is loσated in the elongated bolt insertion slot 10 formed in the upper wall portion 2B of the pedal bracket 2 in abutting engagement with the lower surface of the slide plate 9. In aσσordanσe with the fifth preferred embodiment , the brake pedal apparatus 1 has the same advantages as obtained as the fourth preferred embodiment and has, in addition thereto, an additional advantage . That is , the presence of the tongue-shaped segment 34 whiσh longitudinally protrudes from the forward edge of the nut plate 13 provides an ease of fabriσation of the tongue-shaped segment 34 integral with the nut plate 13 whiσh is consequently formed in a minimum size, with a resultant σompaσtness in the pedal braσket 2, because of a reduced width of the elongated bolt insertion slot 10 which does not need to aσcommodate the rounded portion of the embossed segment 33, for thereby minimizing the width of the upper wall portion 2B of the pedal bracket 2 to a value as small as possible while enabling another advantage to be provided in terms of the weight of the pedalbracket 2. A forwarddistal end of the tongue-shapedsegment 34 is formed in a profile which is obliquely bent downward to allow the forward distal end of the tongue-shaped segment 34 to move through the elongated bolt insertion slot 10 toward a position beneath the upper wall portion 2B of the pedal bracket 2 to assist the shearing of the shear pin 28 and the separation of the same from the slide plate 9 to be useful for releasing the σoupling state between the slide plate 9 and the pedal braσket 2. A sixth preferred embodiment of a brake pedal apparatus 1 aσcording to the present invention is described below with reference to FIGS.13 and 14, wherein the brake pedal apparatus 1 is identical with the first preferred embodiment with the exception for the slideplate 9 , with like or similarparts bearing the same reference numerals as those used in FIGS. 1 and 2 and the redundant description of the like parts being omitted for the sake of simpliσity. In the sixth preferred embodiment, the brake pedal apparatus 1 is identical in struσturewith the fourth preferredembodiment exσept forthe seσondreleasable connecting section In the sixth preferred embodiment , the brake pedal apparatus 1 has the slide plate 9 which is.loσated below the upper wall portion 2B of the pedal bracket 2 in engagement therewith. In particular, a lower surface of the slide plate 9 has the nut 14 welded thereto for fixedly connecting the slide plate 9 to the lower surface of the vehiσular body struσtural member 41. In aσcordance with the sixth preferred embodiment, the brake pedal apparatus 1 has the same advantages of the first preferred embodiment and also has , in addition thereto, another advantage. That is, the presence of the slide plate 9 located in engagement with the lower surfaσe of the upper wall portion 2B of the pedal braσket 2 renders moveable parts, whiσh move responsive to the impaσt forσe beyond the given load exerted to the pedal braσket 2 in the rearward direσtion of the automotive vehiσle during the frontal σollision of the vehiσle, to rest inside the pedal braσket 2 such that an outer appearance of the brake pedal apparatus 1 is highly improved and that it is possible for the slide plate 9 and its peripheral component parts to be prevented from interfering with one another to allow the slide plate 9 to move relative to the pedal braσket 2 in a stable fashion. Further, the presenσe of the nut 14 welded to the lower surface of the slide plate 9 as a fixture member enables an additional speσifiσ σomponent part suσh as the nut plate to be dispensed with, resulting in the brake pedal apparatus having a simplified structure with a reduσed σost. In anyof the first tofifth illustratedembodiments disσussed above, further, although the present invention has been shown and desσribed in the ease where the pedal braσket 2 is fixed to the lower wall of the mounting braσket 44 whiσh is σonneσted to the braσket 43 extending from the steering member 42, the present invention is not limited thereto and the brake pedal apparatus of the present invention may be fixed to the other vehicular body structural part such as a dash upper panel which extends upward in the rearward direction of the vehiσle from the dash floor panel 40. In the first to fifth preferred embodiments disσussed above, although the present invention has been shown and desσribed as having the nut plate 13 wherein the nut is fixedly seσured to the nut plate 13 to form a coupling plate member, a modification may be made such that a fixture bolt is direσtly fixed to the nut plate 13 and is σoupled to a nut loσated the mounting bracket 44 of the vehicular body struσtural member 41. In the sixth preferred embodiment, further, the bolt may be directly fixed to the lower wall of the slide plate 9 in place of the nut 14 secured to the nut plate 13. In these cases, furthermore, the mounting braσket 44 may be formed with a bolt insertion slot having its front end formed in an opened state to have a U-shaped profile. As a result, a module of the steering member and its assoσiated σomponent parts σan be avoided from unnecessarily interfering with the bolt , whiσh extends upward from the pedal braσket 2 , during mounting operation of the module to the vehicle body at one time from the rearward area. A seventh preferred embodiment of a brake pedal apparatus 1 according to the present invention is described below with reference to FIGS.15 to 18, with like or similar parts bearing the same reference numerals as those used in FIGS. 1 and 2 and the redundant description of the like parts being omitted for the sake of simpliσity. In the seventh preferred embodiment, the brake pedal apparatus 1 includes a restrictor section 50, composed of the bolt 12 whiσh is sσrewed into the nut 14 located on a mounting bracket 52 which is located below and joined to the dash upper panel (not shown) . The restrictor section 50 is held in the first position shown in FIGS.15 and 17 and is operative to move with the dash upper panel, which forms part of the vehicular body structural member, in the second position shown in FIG. 16 in response to the impact forσe exerted to the pedal braσket 2 at a value beyond the given load in the rearward direσtion of the automotive vehiσle. In the seventh preferred embodiment, more particularly, the restrictor section 50 is formed of a bottom wall of the bolt 12 which couples the slide plate 9 to the mounting bracket 52. With such a structure, in the event that the pivot bracket 3 is caused to disengage fromthe slide plate 9 by some rare acσident for some reasons , a bottom wall portion 3B of the pivot braσket 3 is brought into abutting engagementwith therestriσtor seσtion 50 as viewed in FIGS.17 and 18 to restriσt the pivotal movement of the pivot braσket 3 at a given angle Of so as to allow the pedal arm 8 to be depressed in a predefined stroke defined by a restricting position (2). In the seventh preferred embodiment , further, the restrictor section 50 is located at a position above the shaft 4 of the pivot bracket 3. With suαh a struσture in the seventh preferred embodiment, in a normal σondition, sinσe the pivotal movement of the pivot bracket 3 is restricted with the slide plate 9 such that the pedal arm 8 assumes the position as shown in FIG. 16. It is thus possible for the pedal arm 8 to rotate about the center of the shaft 6 to render the normal master vaσ. operation via the push. rod 24 σonnected to the pedal arm 8. During a frontal impact of the automotive vehicle, the pedal braσket 2 is moved in the rearward direσtion of the automotive vehiσle along the elongated bolt insertion slot, whiσh serves as the impaσt absorbing means , to permit the σontraσting deformation of the vehiσular body struσtural, thereby σausing the slide plate 9, whiσh is fixed to the dash upper panel (not shown) , to be guided by the upper wall portion 2B of the pedal braσket 2 and to be moved forward relative to the pivot braσket 3. As a result , the pivot bracket 3 disengages from the slide plate 9 to allow the pivot bracket 3 to rotate about the center of the shaft 4 in the counterσloσkwise direction for thereby retracting the depressing position of the pedal arm 8 in the forward direction of the automotive vehicle. Thus, even when the master vac. device (not shown) is moved rearward or the push rod 24 of the master vaσ. (not shown) is moved rearward owing to the deformation of the dash floor panel 40 into a vehiσle σompartment, it is possible for the depressing position of the pedal arm 8 to be shifted rearward within a limited range for thereby minimizing a feeling of physiσal disorder in the operation of the pedal arm 8. In the seventh preferred embodiment, more specifically, since the restrictor section 50 is construσted by the lower surfaσe of the bolt 12 whiσh fixedly σouples the slide plate 9 and the lower surface of the mounting bracket 52, there is no need for preparing an additional specific component part to reduce the manufacturing cost. Also, when the pedal braσket 2 is exerted with the impaσt forσe in the rearward direσtion of the automotive vehiσle at a level beyond the given load during the frontal σollision of the vehiσle, the restriσtor section 50 is shifted to avoid the interferenσe between the restriσtor seσtion 50 and the pivot bracket 3 for thereby allowing the pivot bracket 2 to rotate in the counterσloσkwise direσtion. A modified form of the brake pedal apparatus is desσribed with reference to FIG.19, with like or similar component parts bearing the same reference numerals as those used in FIGS. 15 to 18 to omit the redundant desσription of the like parts for the sake of simpliσity. In the modifiσation shown in FIG. 19, a rear end portion of the slide plate 9 and a rear end portion of the upper wall portion 2B of the pedal braσket 2 are fixedly secured to the lower surface of the mounting bracket 52, which is joined to the lower surface of the dash upper panel (not shown) , by means of the bolt 12 and the nut 14. That is, a threaded portion 12A of the nut 12 is located below the upper wall portion 2B of the pedal braσket 2, with the threaded portion 12A forming the restriσtor seσtion 50. With suσh a structure, the presence of the restriσtor seσtion 50 formed with the threaded portion 12A of he nut 12 enables the restriσtor seσtion 52 to be located at a lower point than the head of the nut 12 shown in FIG. 18, it is possible for the rotation of the pivot bracket 3 to be restricted to a given angle β( β> α.) forminimizing the variation in the depressing position of the pedal arm in the restricted mode of the rotation of the pivot bracket 3. In the seventh preferred embodiment and its modification, although the pedal bracket 2 has been exemplarily shown and described as applied to the lower surface of the dashupper panel, the present invention is not limited thereto and may be fixed to the vehicular struσtural member suσh as the steering member which is located in the upper and rearward position of the dash floor panel 40 and which extends in the widthwise direction of the automotive vehicle. INDUSTRIAL APPLICABILITY As described above, in the present invention, a pedal bracket of the brake pedal apparatus is fixedly conneσted to a lower surfaσe of a vehiσular body struσtural member, with a slide plate and a pedal bracket being ixedly connected to the lower surface of the vehicular body structural member and remaining in a first retaining position during a normal cruising of an automotive vehicle. The brake pedal apparatus is operative to allow the slide plate and the pedal bracket to move relative to one another to assume a seσond retaining position during a frontal collision of the automotive vehiσle. In the second retaining position of the pedal bracket , a pivot bracket is held in a suitable position to allow a pedal arm to provide a comfortable depressing position for a driver. Therefore, a wide applicability thereof including a brake pedal apparatus for an automotive vehicle is expected. The entire content of a Japanese Patent Application No. P2000-280850 and No. P2000-280855 both with a filing date of September 14, 2000 is herein incorporated by reference. Although the invention has been described above by reference . to certain embodiments of the invention, the invention is not limited to the embodiments desσribed above will oσσur to these skilled in the art, in light of the teaσhings. The sσope of the invention is defined with reference to the following claims.

Claims: CLAIMS : 1. A brake pedal apparatus for an automotive vehicle having a dash floor panel and a vehicular body structural member, comprising: a pedal bracket fixedly secured to a dash floor panel and at a coupling position to a lower wall portion of a vehicular body structural member and σarrying thereon a pivot shaft; a pivot braσket pivotally supported on the pivot shaft and having a pedal shaft; a pedal arm pivotally supported on the pedal shaft; a slide plate held in slidable engagement with the pedal braσket ; and an impaσt absorbing section located between the coupling position and the pivot shaft to permit a relative movement of at least thepivot shaft andthelowerwallportionofthevehicular body structuralmemberinaforeandaft direσtionof anautomotive vehiσle for thereby absorbing an impaσt energy when the pedal bracket encounters an impact force exerted rearward in a vehicle compartment at a level beyond a given load suσh that when the pivot shaft and the σoupling position are moved in a σontraσted σondition relative to one another, the pivot braσket disengages from the slide plate to allow the pivot braσket to rotate σounterσloσkwise about the σenter of the pivot shaft. 2. A brake pedal apparatus for an automotive vehiσle having a dash floor panel and a vehiσular body struσtural member, σomprising: a pedal bracket fixedly secured to a dash floor panel and at a coupling position to a lower wall portion of a vehicular body structural member and σarrying thereon a pivot shaft; a pivot bracket pivotally supported on the pivot shaft and having a pedal shaft; a pedal arm pivotally supported on the pedal shaft; a slide plate held in slidable engagement with the pedal bracket; an impact absorbing section located between the coupling position and the pivot shaft to permit a relative movement of at least thepivot shaft andthelowerwallportionof thevehiσular bodystruσturalmember in afore andaft direσtionof anautomotive vehicle or thereby absorbing an impact energy when the pedal bracket encounters an impact force exerted rearward in a vehicle σompartment at a level beyond a given load suσh that when the pivot shaft and the σoupling position are moved in a σontracted condition relative to one another, the pivot bracket disengages from the slide plate to allow the pivot bracket to rotate counterσlockwise about the center of the pivot shaft; and a releasable connecting section coupling at least the slide plateand thepedalbracket to one another andoperative torelease a σoupling state between the slide plate and the pedal bracket when the pedal bracket encounters the impact forσe exerted rearward at the level beyond the given load. 3. A brake pedal apparatus aσσording to claim 2 , wherein the conneσting seσtion is loσated in respective forward endportions of the slide plate and the pivot bracket. 4. A brake pedal apparatus according to claim 2, wherein the pedal bracket has a pair of opposing side wall portions formed in a spaced relationship and an upper wall portion coupled to respeσtive upper edges of the side wall portions to forma a C-shaped configuration in cross section, wherein the connecting section is loσated on the upperwall portion of thepedalbracket , andwherein the pivot bracket has at least one projective segment and the upper wall portion of the pedal bracket has at least one opening to pass the projeσtive segment for allowing the projeσtive segment to be held in engagement with the slide plate. 5. A brake pedal apparatus aσσording to σlaim 4 , further σomprising: a σoupling fixture member fixedly σoupling the slide plate and the upper wall portion of the pedal braσket to the lower wall portion of the vehicular body structural member; and wherein the impact absorbing section is composed of an elongated insertion slot formed in the upper wall portion of the pedal bracket, and the coupling fixture member inserted through the elongated insertion slot to allow the pedal braσket and the slide plate to move relative to one another along the elongated insertion slot. 6. A brake pedal apparatus according to claim 5 , wherein the conneσting seσtion is loσated on a line extending from the elongated insertion slot. 7. A brake pedal apparatus acσording to σlaim 4 , wherein the slide plate is loσated on an upper surfaσe of the upper wall portion of the pedal braσket . 8. A brake pedal apparatus aσσording to claim 7 , wherein the slide plate has a pair of spaced flanges to form a C-shaped configuration in cross section. 9. A brake pedal apparatus according to claim 7 , further αomprising: a nut plate loσated at a lower surfaσe of the slide plate and having one fixture element of the σoupling fixture member; and a seσond releasable σonneσting seσtion interσonnecting the retaining plate to at least one of the pedal braσket and the slide plate; wherein the slide plate and the retaining plate are enabled to be coupled to the lower wall portion of the vehicle body structural member with the one fixture element and the other fixture element of the coupling fixture member. 10. A brake pedal apparatus acσording to claim 9, wherein the second connecting section is located in a position forwardly of the coupling position between the slide plate and the lower wall portion of the vehicular body structural member. 11. A brake pedal apparatus according to claim 9, wherein the second connecting section interconnects the slide plate and the retaining plate via the elongated insertion slot of the upper wall portion of the pedal bracket . 12. A brake pedal apparatus aσσording .to σlaim 9, wherein the seσond releasable σonnecting seσtion includes an engaging segment formed in the retaining plate and extending toward the slide plate. 13. A brake pedal apparatus acσording to σlaim 12, wherein the engaging segment of the seσond releasable connecting section protrudes from a distal edge of the retaining plate. 14. A brake pedal apparatus acσording to claim 12, wherein the engaging segment of the seσond releasable σonnecting section is located in the elongated insertion slot of the upper wall portion of the pedal bracket and is held in abutting contaσt with the slide plate via the elongated insertion slot. 15. A brake pedal apparatus acσording to σlaim 9, wherein the seσond releasable σonneσting seσtion σouples the pedal bracket and the slideplate to the retainingplate and releases a coupling state between at lease the retaining plate and the slide plate and the pedal bracket to allow the retaining plate and the slide plate to move relative to the pedal bracket when the pedal braσket enσounters the impact force beyond the given load. 16. A brake pedal apparatus according to claim 4, wherein the slide plate is loσated at a lower side of the upper wall portion of the pedal braσket. 17. A brake pedal apparatus according to claim 16, wherein the σoupling fixture member is loσated at a lower side of the slide plate. 18. A brake pedal apparatus for an automotive vehiσle having a dash floor panel and a vehicular body structural member, σomprising: a pedal bracket fixedly secured to a dash floor panel and at a coupling position to a lower wall portion of a vehiσular body struσtural member and carrying thereon a pivot shaft ; a pivot bracket pivotally supported on the pivot shaft and having a pedal shaft; a pedal arm pivotally supported on the pedal shaft; a slide plate held in slidable engagement with the pedal bracket; an impact absorbing seσtion loσated between the σoupling position and the pivot shaft to permit a relative movement of at least thepivot shaft andthe lowerwallportionof thevehiσular body structuralmember in afore andaft directionof an automotive vehicle for thereby absorbing an impact energy when the pedal bracket encounters an impact forσe exerted rearward in a vehiσle σompartment at a level beyond a given load suσh that when the pivot shaft and the σoupling position are moved in a σontracted condition relative to one another, the pivot braσket disengages from the slide plate to allow the pivot braσket to rotate σounterσloσkwise about the σenter of the pivot shaft; and a restriσtor seσtion loσated at the coupling point and engaging with a part of the pivot bracket to restriσt a pivotal movement thereof in a counterσlockwise direction under a condition where the pedal bracket remains in a normal position relative to the vehicular body structural member, the restrictor section being operative to move with the vehicular body structural member relative to the part of the pivot bracket when the pedal bracket encounters the impact force exceeding the given load exertedin the rearwarddirection of the automotive vehicle . 19. A brake pedal apparatus acσording to σlaim 18, further comprising a fixture σoupling member σomposed of a bolt inserted from an upward position of the automotive vehicle to fixedly conneσt the slide plate and the pedal braσket to the vehiσular body struσtural member, wherein the restriσtor seσtion includes a threaded portion of the bolt . 20. A brake pedal apparatus acσording to σlaim 18, wherein the pivotbrackethas a substantiallyC-shapedconfigurationinσross seσtion having a lower wall portion extending beneath the pivot sha t, andwherein therestriσtorseσtion is loσatedin aposition above the pivot shaft . 21. A brake pedal apparatus for an automotive vehiαle having a dash floor panel and a vehiσular body structural member, comprising: a pedal bracket fixedly secured to a dash floor panel and at a coupling position to a lower wall portion of a vehicular body structural member and carrying thereon a pivot shaft; a pivot braσket pivotally supported on the pivot sha t and having a pedal shaft; a pedal arm pivotally supported on the pedal shaft; a slide plate held in slidable engagement with the pedal braσket; and impact absorbing means allowing at least the pivot shaft and the lowerwallportion of thevehicularbodystruσturalmember to move relative to one another in a fore and aft direσtion of an automotive vehiσle for thereby absorbing an impaσt energy when the pedal braσket encounters an impact force exerted rearward in a vehicle compartment at a level beyond a given load such that when the pivot shaft and the coupling position are moved in a contracted condition relative to one another, the pivot bracket disengages from the slide plate to allow the pivot bracket to rotate countercloσkwise about the σenter of the pivot shaft . 22. A brake pedal apparatus for an automotive vehicle having a dash floor panel and a vehicular body structural member, comprising: a pedal bracket fixedly secured to a dash floor panel and at a coupling position to a lower wall portion of a vehicular body structural member and carrying thereon a pivot shaft; a pivot bracket pivotally supported on the pivot shaft and having a pedal shaft; a pedal arm pivotally supported on the pedal shaft; a slide plate held in slidable engagement with the pedal bracket ; impact absorbing allowing at least the pivot sha t and the lower wall portion of the vehicular body structural member to move relative to one another in a fore and aft direction of an automotive vehicle for thereby absorbing an impact energy when the pedal bracket enσounters an impaσt forσe exerted rearward in a vehiσle σompartment at a level beyond a given load suσh that when the pivot shaft and the coupling position are moved in a contraσted σondition relative to one another, the pivot braσket disengages fromthe slideplate to allowthepivot bracket to rotate σounterclockwise about the center of the pivot shaft; and releasable connectingmeans couplingat least the slide plate and the pedal bracket to one another and operative to release a coupling state between the slide plate and the pedal braσket when the pedal braσket enσounters the impaσt forσe exerted rearward at the level beyond the given load. 23. A brake pedal apparatus for an automotive vehiσle having a dash floor panel and a vehiσular body struσtural member, σomprising: a pedal braσket fixedly seσured to a dash floor panel and at a coupling position to a lower wall portion of a vehicular body structural member and carrying thereon a pivot shaft; a pivot bracket pivotally supported on the pivot shaft and having a pedal shaft; a pedal arm pivotally supported on the pedal shaft; a slide plate held in slidable engagement with the pedal bracket; impaσt absorbing means allowing at least the pivot shaft andthe lowerwall portion of thevehiσularbodystructuralmember to move relative to one another in a ore and aft direσtion of an automotive vehiσle for thereby absorbing an impaσt energy when the pedal braσket encounters an impact force exerted rearward in a vehicle compartment at a level beyond a given load such that when the pivot shaft and the coupling position are moved in a contracted condition relative to one another, the pivot bracket disengages from the slide plate to allow the pivot bracket to rotate counterclockwise about the center of the pivot shaft ; and restriσtor means restricting a pivotal movement thereof in a counterclockwise direction under a σondition where the pedal bracket remains in a normal position relative to the vehicular body structural member, the restrictor section being operative to move with the vehicular body struσtural member relative to the part of the pivot braσket when the pedal braσket encounters the impact force exceeding the given load exerted in the rearward direction of the automotive vehicle.

Inventors: AOKI TSUTOMU, KAWAHARA SADAHIRO, MIZUMA HIROYUKI, AOKI, TSUTOMU, KAWAHARA, SADAHIRO, MIZUMA, HIROYUKI
Applicants: AOKI TSUTOMU, F TECH INC, KAWAHARA SADAHIRO, MIZUMA HIROYUKI, NISSAN MOTOR, AOKI, TSUTOMU, F. TECH INCORPORATION, KAWAHARA, SADAHIRO, MIZUMA, HIROYUKI, NISSAN MOTOR CO., LTD.
Application year: 2001
Main classification: B60T7
IPC codes: B60T7, G05G1