MXPA97003002A - Mensula or support for horizontal ring of avant - Google Patents

Abstract

The present invention relates to a bracket or support assembly for connecting a fifth wheel to a truck, characterized in that it comprises: a base adapted to be secured to the rear end of a truck, a pair of spaced retainer assemblies connected to the base and arranged adjacent the opposite edges of the base, each of the retainer assemblies includes spaced vertical support plates placed substantially perpendicular to the base, one of the plates has an opening that receives a pivot therethrough, and a portion thereof. of cylindrical tube coaxial with the opening receiving the pivot and connected to the support plates, and a hub or sleeve radially reinforced, housed in the cylindrical tube portion, the hub has an elastomeric cylindrical body of a predetermined outside diameter having a perforation through the longitudinal axis of the body, the perforation has a first diameter and is coaxial with the opening that re With the pivot, and generally a rigid annular member of predetermined outer diameter coaxial with the body, the annular member has an aperture of a second diameter greater than the first diameter.

Description

AVANTRÉN HORIZONTAL RING MENSOR OR SUPPORT FIELD OF THE INVENTION The present invention relates to a support assembly for connecting a tractor or truck with a trailer. More particularly, the present invention is directed to a new and improved support assembly, designed to fix or secure the upper plate or horizontal ring of the limber to a truck structure and allow the connection of the trailer to the truck.

BACKGROUND OF THE INVENTION In the technique to which this invention applies, it has generally been a practice to provide an apparatus for attaching a trailer of a trailer-type car to a truck to ensure a firm and strong connection, still easily releasable, that can be moved in a pivotan-te »Traditionally, the connection between the truck and the trailer has been made by fixing or securing pi votantemente a downwardly dependent central pivot, carried on the front of a trailer to a fixing mechanism that can be fixed, commonly called a" horizontal ring for limber. " The horizontal ring for Ref. 24607 limber is fixed or secured to the chassis or rear structure of the truck. More particularly, a base plate is fixed or secured to the structure or rear chassis of the truck and generally positioned in an orientation parallel to the road. A pair of support elements are provided and placed adjacent to the edges of the base plate and fixed or secured thereto. Each support member generally includes a means for pivotally securing or securing a top plate thereto, such as an opening for receiving fixation pins. A top plate with a passage or throat positioned internally and centrally for retaining and fixing the center pivot dependently down from a truck, is positioned to be carried by the support elements. The top plate includes a securing mechanism for releasably retaining and fixing the center pivot in the passage or throat. The top plate is generally pivotally connected to the support bracket for inserting a pivot through a portion of the side of the top plate and the support element. Pivots are usually inserted along a transverse axle of the truck and the road. This configuration allows the upper plate to be fixed or rotatably secured to the camxon. The upper plate of some horizontal limber rings of the prior art may include a skirt that is downwardly dependent from its outer edge. When the upper plate is placed on the support brackets, a portion of the skirt is placed parallel and adjacent externally to each of the support hatches. The top plate may also include a downwardly parallel dependent projection spaced inward from a portion of the skirt dependent on the top plate to form a generally U-shaped inverted channel that fits over the support brackets. The downwardly dependent projection and the downwardly dependent skirt also have openings therethrough which align with and which are coaxial with the openings in the support elements. A pivot is inserted through the dependent skirt portion in each of the support brackets and the descendingly dependent projection connecting the top plate to the support brackets. The upper plate now fixed or secured to the truck is capable of receiving the center pivot of the trailer and securing or securing it to the truck. In these arrangements of the prior art, significant loads are supplied to the bracket and pivot assembly as a result of the tendency of the upper plate to move upward away from the support brackets due, for example, to jumps or rebounds and to movement. from side to side of the trailer. In addition, rollover loads occur when the truck is turned, even at low speeds. With the overdraft or rollover, there is a tendency for the top plate to rise in one of the locations of the support bracket. This tendency for the top plate to rise and move away from the support brackets, produces shearing forces or shear stress on the pivots. The shearing forces can cause deformation of the pivot, considerably weakening the connection between the truck and the trailer, and can also damage the horizontal limber ring eventually leading to a stoppage time for the truck to be repaired. In view of the foregoing, there remains a need for a bracket or bracket assembly that is economical, strong, and capable of withstanding the loads created by the movement of the top plate relative to the bracket or bracket assembly. In addition, there is a need for a bracket or support assembly that helps distribute the shearing forces involved in connecting a truck to a trailer.

BRIEF DESCRIPTION OF THE INVENTION The purpose and advantages of the invention will be described and evident from the description and the drawings that follow, as well as will be learned by the practice of the invention. The additional advantages of the invention will be realized and achieved by the elements of the apparatus pointed out particularly in the appended claims. To achieve these and other advantages and in accordance with the purpose of the invention, as embodied and extensively described herein, the bracket or bracket of the present invention includes a bracket or bracket assembly for connecting a horizontal limber ring to a truck. : The assembly includes a base adapted to be fixed or secured to the rear end of a truck. A pair of spaced retainer mounts are connected to the base and placed adjacent to the opposite edges of the base. Retention mounts include support plates spaced apart, positioned substantially perpendicular to the base. One of the support plates includes a locking or securing opening for the pivot. The bracket or bracket assembly is also provided with a portion of cylindrical tube coaxial with the fastening or securing opening of the pivot and carried on the support plates. A radially reinforced bushing or bushing is seated in the cylindrical tube portion. The reinforced bushing includes a through hole coaxial with the fixing or securing opening of the pivot. In a further embodiment of the present invention, a top plate is provided adapted to receive and secure the center pivot of a trailer. The top plate is positioned on the pair of retention mounts and includes a peripherally downwardly dependent skirt and a chair or seat formed internally from the skirt portion. The seat of the skirt portion is adapted to couple the cylindrical tube portion of the retainer mounts. A portion of the opposite ends of the skirt is positioned parallel to and externally from the support plates and includes an opening therethrough. A pair of support pins are each provided extending through the opening in the skirt, the opening in the support plate and through the bore of the reinforced bushing respectively. In addition, a pair of fixing pivots are provided to prevent the removal of the pair of support pivots. It is to be understood that both the foregoing general description and the following detailed description are exemplary and provided for purposes of explanation only, and are not restrictive of the invention, as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated and constitute a part of this specification, illustrate the preferred embodiment of the invention, and together with the description, serve to explain the principles of the invention. Figure 1 is an isometric view of the present invention. Figure 2 is an isometric view of an alternative embodiment of the present invention with the top plate of the present invention shown with interrupted lines. Figure 3 is an isometric view of the present invention with the top plate removed. Figure 4 is a cross-sectional view of the support assembly of the present invention of Figure 1 taken along lines 4-4. Figure 5 is an isometric view of the reinforced bushing or bushing used in the support assembly of the present invention. Figures 6a ~ c are side, bottom and top views of the support pivot of the present invention. Figures 7a-b are side and top views of the retaining pin of the present invention.

Figure 8 is a plan view of the bottom side of the top plate of Figure 1 of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED MODALITY Reference will now be made in detail to the currently preferred embodiment of the bracket or assembly of the present invention for attaching a trailer to the tractor., the examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference characters will be used in all the drawings to refer to identical or similar parts. An exemplary embodiment of the preferred bracket or bracket assembly of the present invention is shown in Figure 1 and generally designated by the reference character 100. Figure 1 shows the upper plate 102, commonly referred to as a horizontal limber ring, the mounting of the lower bracket 104, and the base 106. Referring now to Figure 3, the base 106 includes a generally rectangular base plate 108. The base plate 108 includes openings 110 for receiving a bolt for securing or securing the base plate to the chassis or main structure of a truck (not shown). Turning now to Figure 1, the base plate 108 can be carried on a structure or frame 112 having parallel panels 114 spaced apart, elongated, and transverse panels 116 spaced apart, connected through the ends of the elongated panels 114 to form a structure 112 generally box-shaped. The rails 118 are positioned along the outer edge of the elongated parallel panels 114. The rails 118 are preferably secured by screws or bolts through the structure 112 to the frame of the truck. The rails 118 form channels 120 which receive the side edges of the base plate 108 and guide the base plate 108 to selected positions along the structure of the truck. Placed on the rear end of the base plate 108 are the generally vertical oscillation limiting blocks 122, designed to limit the oscillating or reciprocating movement of the upper plate 102 when it is fixed or secured to the retaining assembly 104. Alternatively, as shown in Figure 2, the base plate 108 can be fixed or secured to a pair of elongated angle irons 124, which have a series of openings 126 positioned along the horizontally disposed projection portions 128. The angle irons 124 are fixed to the chassis or main structure of the truck preferably with nuts and bolts. The base plate 108 can be fixed or secured to the positions ¬ selected positions along the structure or frame of the truck, moving the base plate to a desired position on the iron at an angle and fixing or securing the base plate 108 to the iron at an angle through the holes 126. Referring again to the Figure 3, the lower support assembly 104 is carried on the base plate 108 and generally includes a pair of vertical retention assemblies 130, spaced apart, which are placed towards the side edges of the base plate 108. Each retention assembly 130 includes a pair of vertical support plates 132A and 132B spaced apart from each other and a generally triangular strut 124 connected to support plates 132 forming a generally hollow cylindrical tube 136 supported by the two brackets or vertical supports. Communicating with the generally hollow cylindrical tube 136 of each retention assembly, there is an aperture 138 of a predetermined diameter, formed through the support plate 132A closest to the side edge of the base plate 108. The diameter of the aperture 138 a through the support plate 132A is generally sized to accommodate a support pivot 140 of the type illustrated in Figure 6 and to allow limited movement of the pivot in the opening. To allow limited vertical movement of a support pivot 140, the opening 138 may be configured as a vertically oriented oval. Spaced internally from the opening 138, the tube 136 of a considerably larger diameter extends internally and terminates in an internally formed shoulder 142. The opening 138 and the central axis of the tube 136 are coaxial. The retaining mounts 130 can be integrally molded or welded together. It is preferred that the retaining mounts 130 be constructed of cast or fabricated steel. The retainer assembly 130 is fixed or secured to the side edges of the base plate, preferably by welding. The final element of the retainer assembly includes a bushing or bushing 144 of reinforced rubber, preferably integrally formed with a steel washer of substantially identical external diameter, as illustrated in Figure 5. The diameter of the hole through the bushing or rubber bushing, is generally sized to receive a support pin 140 preferably of the type illustrated in Figure 6. The pivot must preferably fit snugly within the hole through the bushing or bushing 144. The opening in the steel washer that Reinforces the bushing or rubber bushing, preferably it should be slightly larger in diameter than the hole through the bushing or bushing. This arrangement allows the rubber bushing or bushing to dampen the vibrations transmitted through the pivot 140 and also allows the steel washer to distribute the shearing force. The bushing or rubber bushing 144 is dimensioned and shaped to fit snugly within the hollow cylindrical tube 136 of the retaining assembly 130. The bushing or rubber bushing 144 is preferably dimensioned so that it is held in the tube 136 by an adjustment of interference. The bushing or rubber bushing 144 is preferably comprised of a relatively hard rubber or other elastomeric material. Alternately, as shown in Figures 3 and 4, the rubber bushing or bushing can be reinforced with a steel washer 146, substantially of the same outer diameter as that which is placed adjacent the housing 144 in the pipe 130. As illustrated in Figure 4, the steel washer adjacent to the bushing or bushing provides additional strength and support to the assembly 100 by distributing the shearing force to which the support pin 140 is subjected. The effect is to change the forces acting on it. the pivot from single or single shear to double shear In addition, the bushing or reinforced bushing 144 can act to reduce or dampen some of the vibration created in the support assembly during the movement of the truck and the trailer.

The upper plate 102, as illustrated in Figure 1, is also referred to as the horizontal rim of the limber, includes a large flat plate 148 with a gradually tapering throat 150 formed in the center. A skirt 152 is downwardly dependent from the outer edges of the upper planar plate 150. The skirt 152 is preferably integrally formed with the planar plate. The center of the underside of the flat plate 150 includes a securing mechanism 151 (shown generally in Figure 8) for securing or securing the central pivot of a trailer to the upper plate 102 *. A variety of configurations for the securing mechanism are available and are well known in the art. The securing mechanisms of this type generally include a jaw which secures or secures the center pivot in the throat of the upper plate and a wedge for fixing the jaw in place. Laterally adjacent to the securing mechanism, the underside of the flat plate includes a seating area 154 formed along opposite sides of the top plate 102 as illustrated in Figure 8. The chair or seat 154 is formed by a portion of the dependent skirt 152, the flat plate 148, and a projection 156 dependently descended from the underside of the flat plate 148 and spaced internally from the skirt portion 152. The seat 154 may include a seat support surface 158 , generally arcuate which is dimensioned to accommodate and couple the hollow cylindrical tube 136 of the retention mounts 130. The dependent skirt portion 152 includes an aperture 160 coaxial with an aperture 162 similarly sized, through the internally spaced dependent projection 156. The similarly dimensioned openings 160, 162 are sized to receive the support pin 140 when the upper plate is secured or secured to the lower support assembly. As shown in Figure 6, an elongated cylindrical support pin 140 is provided for securing or securing the top plate to the retainer assemblies. The support pivot 140 is dimensioned to extend from the opening 160 in the dependent skirt portion through the aperture 162 in the internally spaced, dependent projection portion 156. The support pivot 140 includes a rectangular stop or detent 164 connected to the rear end of the pivot 140. The stop or retainer 164 is preferably welded to the rear end of the pivot and is longer than the diameter of the opening 160 in the portion of the pivot. dependent skirt. A retaining pivot assembly 166 illustrated in Figures 1 and 4 includes a generally hollow cylindrical tube 168, positioned in a vertical orientation and which is shown in Figure 1 welded to the outer surface of the dependent skirt portion 152. above the opening 160 through the skirt portion. A retaining pin 170 shown in detail in Figure 7 is provided to be inserted through the vertically positioned cylinder tube 168 and abuts the end surface of the detent 164. The retaining pin 170 includes a circular head 172. partially flat, larger in diameter than the pivot 170 which is adapted to engage the upper edge of the cylindrical tube 168 to prevent the pivot 170 from falling through the tube 168 and to keep the support pivot 140 in place. The support assembly 100 of the present invention provides increased resistance against overturning of the assembly and allows a more even distribution of the load during rollover and stresses on the support assembly. In a typical installation, the structure or frame 112 is fixed to the chassis or main structure of the truck by bolting the frame to the chassis. The structure 112 can be additionally fixed to the truck by supplying bolts through the rails or rails 118. The base plate 108, which has retaining mounts 130 fixed or secured thereto, is positioned in channels 120 formed by rails or rails 118 and slides to an appropriate position on the structure of the truck and is fixed or secured thereto. such as by means of bolts that extend through the openings 110. The position of the base plate 108 and the lower support assembly 104 on the structure of the truck is determined in a manner well known in the art based on a variety of factors that include the type of trailer, the type of truck, and the load that will be fixed to the truck. Once the base plate 108 is fixed or secured to the truck structure in its desired location, a bushing or reinforced bushing 144 is inserted into each of the hollow cylindrical tubes 136 so that the front face of the bushing or rubber bushing is spliced against the support plate 132A. The hub or casing 144 should fit snugly in the tube. The bushing or rubber bushing 144 is generally sized so that it remains seated in the hollow cylindrical tube 136 and forms an interference fit within the hollow tube 136. The bushing or rubber bushing can be integrally reinforced or reinforced with a washer of steel of identical diameter placed adjacent to the bushing or bushing in the tube 136 as described above. The upper plate 102 or the horizontal limber ring is then placed on the lower support assembly 104 and the retaining assemblies 130 so that a portion of the dependent skirt 152 is positioned generally parallel to and adjacent externally from the support plate 132A as it is. illustrated in Figures 1, 2, and 4. Further, the protruding portion 156 dependently downward from the flat plate 148 is positioned generally parallel to and adjacent internally to the support plate 132B and the rim 142 of the tube 136. The upper surface of the hollow cylindrical tube 136 is then fitted into seat 154 of upper plate 102 providing contact between surface 158 that carries the seat of the upper plate and tube 136 of retaining assembly 130. Openings 160, 162 through of the skirt portion 152 and the projection portion 156 dependently downwardly of the upper plate 102 should be aligned coaxially with the opening 138 through the support plate 132A and the longitudinal axis of the hollow cylindrical tube 136. The support pivot 140 is then inserted through the opening 160 in the depending skirt portion, the opening 138 in the first one. vertical plate, the bushing 144, the opening formed by the support 136 of the tube and the opening 162 in the protruding portion 156 dependently downwardly of the upper plate 102. When the bushing or bushing is reinforced by a steel washer placed adjacent, the pivot 140 also - 1¡ could be extended through the steel washer as illustrated in Figure 4. The support pivot 140 is inserted until the stop or detent 164, fixed or secured to the rear end of the pivot 140, engages the portion 152 of the skirt of the upper plate. A retaining pin 170 is then inserted through the hollow tube 168 positioned vertically, until it engages the stop or retainer 164 connected to the pivot 140 to prevent the support pivot 140 from bouncing off the support assembly 100. The top plate 102 is securely secured to the lower support assembly 104 and allows T to rotate about the axis defined by the support pivot 140. It should be understood that two support pins 140 are used to fix or secure the upper plate 102 to the assembly bottom bracket 104 - one for each retaining assembly 130. One of the obvious advantages of the present invention is that the use of the reinforced rubber bushing or bushing assists in the distribution of shear forces on the support pivot 140 when a load is applied to the support assembly. This arrangement thus provides a resistance to the larger rollover of the support assembly. It is also proposed that the bushing or reinforced bushing 144 of the present invention can be added to existing support assemblies to provide the benefit of greater resistance to rollover and redistribution of shearing or shear forces. During the movement of the tractor-trailer assembly, there is a tendency for the top plate, which connects the tractor and the trailer, to rise upward away from the lower support assembly. When this occurs, a force is normally applied to the longitudinal axis of the pivot 140 at the points where the radial movement of the pivot 140 is restricted, such as by the annular surface of the openings 138 of the support plate 132A. Including a steel washer adjacent to the bushing or an integrally reinforced bushing or bushing, a portion of the load or shearing force is acting on the pivot 140 at a point effectively distributed to another portion of the pivot whereby the concentration is reduced of the shearing force in any portion along the pivot 140. Accordingly, the total resistance of the support or bracket is increased. In addition, the bushing or rubber bushing aids in the damping of vibrations that occur between the upper plate and the lower bracket assembly. The present invention incorporating the reinforced rubber bushing or bushing also more evenly distributes the load during overdraft or rollover such as when the trailer moves in a pivoting relationship with the truck. During this type of movement, there is a tendency for the upper plate 102 to tilt and rise above one or the other of the retaining mounts 130. The present invention aids in the distribution of the load. In view of the above description, it is evident that the present invention provides a new and unique bracket or support for attaching a top plate of a horizontal limber ring to the tractor or truck. Although reference has been made to the use of the present invention, it will also be apparent to those skilled in the art that various modifications and variations may be made in the design and construction of the mounting of the bracket or bracket without departing from the scope or spirit of the invention. . Other embodiments of the invention will become apparent to those skilled in the art from consideration of the specification and practice of the invention described herein. It is proposed that the specification and examples be considered only as exemplary, with the true scope and spirit of the invention that are indicated by the following claims.

It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it relates.

Having described the invention as above, property is claimed as contained in the following

Claims (28)

R E I V I N D I C A C I O N S

1. A bracket or support assembly for connecting a horizontal limber ring to a truck, characterized in that it comprises: a base adapted to be fixed or secured to the rear end of a truck; a pair of spaced-apart retention assemblies, connected to the base and opposite adjacent placed edges of the base, each of the retention assemblies includes vertical support plates, spaced apart, placed substantially perpendicular to the base, one of the plates have an opening that receives a povote therethrough, and a portion of cylindrical tube coaxial with the opening for receiving the pivot and connected to the support plates; and a bushing or bushing radially reinforced, seated in the cylindrical tube portion and having a bore therethrough, coaxial with the opening that receives the pivot.

2. The support or bracket assembly according to claim 1, characterized in that it also comprises a sub-base, the sub-base includes a pair of brackets or elongated supports, spaced apart, placed longitudinally on the truck, each of the brackets or Elongated supports includes an elevated rail portion that defines a channel adopted to receive the base.

3. The bracket or support assembly according to claim 1, characterized in that the reinforced bushing or bushing includes an adjacently placed steel washer having an opening therethrough substantially coaxial with and similarly sized as the aperture receiving the pivot.

4. The bracket assembly according to claim 1, characterized in that the base includes vertical antioscilant plates, placed in front of each of the retaining mounts.

5. The bracket or support assembly according to claim 1, characterized in that the vertical plates spaced apart include a first plate placed adjacent the edge of the base and a second plate placed internally from the edge.

6. The mounting bracket or support according to claim 1, characterized in that the base includes a plurality of openings adapted to receive a bolt to fix or secure the base to the truck.

7. The bracket or bracket assembly according to claim 2, characterized in that the reinforced bushing or bushing includes an adjacently placed steel washer having an opening therethrough substantially coaxial with and similarly sized as the aperture for receiving the pivot .

8. The bracket or support assembly according to claim 2, characterized in that the base includes vertical antioscilant plates placed in front of each of the retaining assemblies.

9. The bracket or support assembly according to claim 2, characterized in that the plates spaced apart include a first plate placed adjacent the edge of the base and a second plate placed internally from the edge.

10. The mounting bracket or support according to claim 2, characterized in that the base includes a plurality of openings adapted to receive a bolt to fix or secure the base to the truck.

11. A bracket or support assembly for connecting a trailer to a truck, the bracket or support assembly is characterized in that it comprises: a base adapted to be fixed or secured on the rear end of a truck; a pair of spaced-apart retention assemblies, connected to the base and opposite edges of the base positioned adjacent, the retaining assemblies include vertical support plates, spaced apart, positioned substantially perpendicular to the base, one of the plates includes an opening for receiving a pivot, a hollow cylindrical portion substantially coaxial with the opening for receiving the pivot, connected to the support plates; a radially reinforced bushing or bushing seated in the cylindrical portion; a top plate adapted to receive and fix or secure the main pivot of a trailer placed on the pair of retaining assemblies, the upper plate includes a peripherally descendent, skirt portion, the skirt portions positioned substantially parallel to and adjacent externally from the plates of support, the portions of the skirt each include an opening therethrough; and a pair of fastening pivots each adapted to extend successively through the opening in the skirt portions, the opening for receiving the pivot and the bushing or reinforced bushing.

12. The bracket or support assembly according to claim 11, characterized in that it also comprises a sub-base, the sub-base includes a pair of brackets or elongated supports, spaced apart, placed longitudinally on the truck, each of the brackets or Elongated supports includes an elevated rail portion that defines a channel adopted to receive the base.

13. The bracket or bracket assembly according to claim 11, characterized in that the reinforced bushing or bushing includes an adjacently placed steel washer having an opening therethrough substantially coaxial with and similarly sized as the opening that receives the pivot.

14. The bracket or support assembly according to claim 11, characterized in that the base includes vertical antioscilant plates placed in front of each of the retaining assemblies.

15. The bracket or support assembly according to claim 11, characterized in that the vertical plates spaced apart include a first plate placed adjacent the edge of the base and a second plate internally placed from the edge.

16. The mounting bracket or support according to claim 11, characterized in that the base includes a plurality of openings adapted to receive a bolt to fix or secure the base to the truck.

17. The bracket or bracket assembly according to claim 12, characterized in that the reinforced bushing or bushing includes an adjacently placed steel washer having an opening therethrough substantially coaxial with and similarly sized as the aperture receiving the pivot.

18. A bracket or support assembly for connecting a trailer to a truck, the bracket or support assembly is characterized in that it comprises: a base adapted to be fixed or secured on the rear end of a truck; a pair of retaining mounts spaced apart, connected to the base and positioned adjacent to the opposite edges of the base, the retaining mounts include vertical spaced plates spaced apart, positioned substantially perpendicular to the base, one of the support plates includes an opening for receiving the pivot, and a hollow cylindrical tube portion substantially coaxial with the opening for receiving the pivot and connected to the support plates; a bushing or bushing radially reinforced, seated in the cylindrical tube; an upper plate adapted to receive and secure the main pivot of a trailer, the upper plate placed on the retaining assemblies and including a peripherally descendant dependent skirt, and a descendently dependent projection, which cooperates with a portion of the skirt to form a seat adapted to couple the cylindrical tube portion of the retaining mounts, the skirt portions are positioned parallel to and adjacent externally from the support plates and include an opening therethrough, coaxial with the opening for receiving the pivot and a second opening through the projection; a pair of fixing pivots each adapted to extend successively through the opening in the skirt portion, the opening for receiving the pivot, the bushing or reinforced bushing and the second opening in the projection.

19. The mounting bracket or support according to claim 18, characterized in that the downwardly dependent projection is placed internally from the support plates when the upper plate is placed on the retaining assemblies.

20. The bracket or support assembly according to claim 18, characterized in that it also includes fixing pivots to prevent the removal of the pair of fixing pivots.

21. The bracket or support assembly according to claim 18, characterized in that the seat includes an exact support surface.

22. Mounting bracket or support according to claim 18, further comprising a sub-base, sub-base includes a pair of brackets or elongated supports spaced away, longitudinally placed on the truck, each of the brackets or Elongated supports includes an elevated rail portion that defines a channel adopted to receive the base.

23. Mounting bracket or support according to claim 18, characterized in that the hub or cap reinforced includes a steel washer adjacently positioned having an opening therethrough substantially coaxial with and dimensioned similarly as the opening for receiving the pivot .

24. The bracket or support assembly according to claim 18, characterized in that the base includes vertical antioscilant plates, placed in front of each of the retaining assemblies.

25. The mounting bracket or support according to claim 18, characterized in that the vertical plates spaced apart include a first plate placed adjacent the edge of the base and a second plate internally placed from the edge.

26. The mounting bracket or support according to claim 18, characterized in that the base includes a plurality of openings adapted to receive a bolt to fix or secure the base to the truck.

27. Mounting bracket or support according to claim 22, characterized in that the hub or cap reinforced includes a steel washer adjacently positioned having an opening therethrough substantially coaxial with and dimensioned similarly to the opening for receiving of the pi ote

28. A bushing or cap reinforced for use with a mounting bracket or bracket clamping a truck to a trailer, the bushing or sleeve is characterized by comprising: an elastomeric cylinder body of a predetermined outside diameter having a bore through the longitudinal axis of the body, the hole has a first diameter; a generally rigid annular element of the predetermined external diameter, integral and coaxial with the body, the annular element has an opening of a second diameter larger than the first diameter.