Abstract:
A wheel stop apparatus comprising a stopper plate, one end of which is pivotally attached to a bottom plate. The present improvement includes a prolonged shaft-like portion formed in a supporting plate having rises positioned on either side of said prolonged shaft-like portion so as to maintain and stabilize the stopper plate.

Description:
BACKGROUND OF THE INVENTION 
     A conventional wheel stop apparatus, an example of which is shown in FIG. 1, is comprised of a ramp board 15 pivotally mounted to one end edge of a bottom plate 9 by a support shaft 5. The other end edge of the ramp board 15 is pivotably mounted upon the ends of a substantially U-shaped member 7 formed by the bending of a rod-like material. Such a structure is expensive in cost and heavy in weight because of the different types of plates, rods, shafts and the various types of materials needed to form such plates, rods, shafts, and the like. Furthermore, many man-hours are demanded for fabrication thereof. 
     In order to remedy such drawbacks, the present applicant invented a wheel stop apparatus according to the structure shown in FIG. 2, for which U.S. Pat. No. 4,109,763 was granted. The apparatus of U.S. Pat. No. 4,109,763 provides a structure that is fitted between a groove 33 of a support plate 23 having a broad bearing portion 25 secured to a stopper plate 15. The apparatus disclosed in U.S. Pat. No. 4,109,763 has a problem with instability due to an oscillating effect which occurred between the stopper plate 15 and the support plate 23. 
     SUMMARY OF THE INVENTION 
     The present invention comprises an improvement over U.S. Pat. No. 4,109,763. The improvement includes certain techniques wherein the bearing portions of the ramp board 15 comprise a prolonged shaft-like portion which is formed by cutting off the top portion of the support plate. Small rises are positioned on either side of the prolonged shaft-like portion and are butted against and engaged by the top edge of the support plate 23. The present invention further comprises other related techniques. 
     Accordingly, it is an object of the present invention to improve on the construction of U.S. Pat. No. 4,109,763. 
     It is another object of the present invention to improve the conventional wheel stop apparatus. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 shows an illustrative example of a conventional wheel stop apparatus. 
     FIG. 2 illustrates the apparatus of U.S. Pat. No. 4,109,763. 
     FIG. 3 is a perspective view of a first embodiment of the present invention. 
     FIG. 4 shows the embodiment of FIG. 3 in a collapsed posture. 
     FIG. 5 is a plan view of a stopper plate of the embodiment shown in FIG. 3. 
     FIG. 6 is a cutaway view showing the principal part of a stopper plate of the embodiment shown in FIG. 3. 
     FIG. 7 is a cutaway view showing the principal part of the support plate of the embodiment shown in FIG. 3. 
     FIG. 8 is a section view of the embodiment shown in FIG. 3 showing the stopper plate and lateral plate in a pivoted posture. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     The present invention will be illustrated with particular reference to FIGS. 3-8. 
     A bottom plate 9 is bent upwards so as to form two lateral plates 11, these lateral plates being on either side of the bottom plate 9 and formed so as to further comprise a checking portion 13 at one end thereof. The bottom plate 9 further comprises two crossed grooves 10 of corner cross-section formed in the surface thereof. The bottom plate further comprises two reinforcing hollows 39 which are formed at the forward end of the bottom plate 9, and also comprises a pluralty of reinforcement notches 37 formed at the opposite end from said reinforcement hollows to reinforce the bottom plate. 
     One end of the ramp board 15 is pivotably mounted to the rear end of the bottom plate 9. As shown best in FIG. 8, a shaft member 19 is rotatably fitted into the lateral plates 17 in the stopper plate 15 and further rotatably fitted in the lateral plates 11 of the bottom plate 9. The bottom plate 9 may be collapsed so as to be retained within said stopper plate 15 and thus, the shaft 19 may be so retained by partial punching of the lateral plates 17 in the stop plate 15, and by further partial punching in the lateral plates 11 of the bottom plate 9. 
     The lateral plates 17 in the stop plate 15 are formed having thickened portions 18 and thus, the lateral plates 17 may be folded even if the lateral plates 11 of the bottom plate 9 are deformed when being used. 
     As will be understood from a review of FIGS. 5 and 6, the surface of the ramp board 15 is also formed having a cross grooved section 16, and is further formed having a concave shape so as to check wheels resting thereon. A reinforcement member 33 and a notch 35 are arranged on the ramp board 15 at suitable positions adjacent to the axial shaft 19. Two axial support positions 25 are formed by cutting openings therefor in the underside of said ramp board 15 so as to position the axial support portions 25 in the uppermost central portion of the ramp board 15. In a little higher position relative to said two axial support portions 25, two checking rises 26 are placed on either side thereof so as to extend downward into the notch 35 of said ramp board 15. 
     A check plate 23 is arranged to lift and support the ramp board 15 on the bottom plate 9, and the check plate is formed having a transversely prolonged axial portion 29 by punching the top portion of the check plate along the end edge 31 thereof shown in FIG. 7. 
     The check plate 23 is pivotally mounted to the ramp board 15 by inserting said axial portion 29 of the check plate into the axial supports 25 of the ramp board 15. Furthermore, the end edge 31 is fitted to the check rises 26 of the ramp board 15. When the check plate 23 is formed with a groove 24 having suitable rise or dent shape, the check plate 23 is butted against the ramp board 15 so as to prevent any backward movement thereof. The bottom of the grooves 24 in the check plate 23 are also buttressed so that the check plate may not move pivotably rearward or backlash between the bottom plate 9 and the ramp board 15. Thus, the check plate 23 is effectively squeezed between the top plate 15 and the bottom plate 9, and has the effect of a kind of elastomer under a squeezed condition. 
     With the above construction, the check plate is arranged on the ground with the check portion 13 having a posture as in FIG. 2, so as to stop the wheels of automobiles, etc. The wheel stopping apparatus can be collapsed by rotating the check plate 23 in the direction of the arrow of FIG. 3. Furthermore, if the ramp plate 15 is collapsed downward, it will be understood that the present apparatus will take on a thin construction and be of portable compact dimensions. (See FIG. 4.) 
     As described hereinbefore, a wheel stop apparatus according to the present invention provides a check plate 23 pivotably mounted to the upper portion of a ramp board plate 15 which is furthermore pivotably mounted to the lateral sides 11 of a bottom plate 9. The lower end of the check plate 23 is mounted pivotably to the opposite end of the bottom plate 9 so as to form the wheel stopping apparatus. A plurality of shaft bearings 25 are arranged by cutting and bending one side of the upper portion of the ramp board 15 so as to connect the ramp board to the check plate 23. The underside of the ramp board further comprises checking rises 26 which are arranged on either side of the shaft bearings 25, with the upper portion of the check plate 23 being partially cut open along the upper edge 31 so that the transversely prolonged axial portion 29 may be removably inserted to the axial portions of the shaft bearings 25 of the ramp board 15, and the upper edge 31 of the check plate 23 is thereby tightly fitted to said checking rises 26. Such construction provides the ramp board 15 to be stably fitted to the check plate 23. 
     With a structure according to the present invention, the lateral plates of the ramp board have thickened portions which permit the apparatus to be collapsed even if the lateral plates are deformed. Also, even if an automobile should run over the check plate 23 while in a collapsed position, the lateral plate of the check plate and the bottom plate will never be deformed because they are covered and protected by the thickened portions. It is to be understood that the present invention is not to be limited by the above description of the preferred embodiment, and may be effected within different modes.