WO2007138448A1 - Connector assembly for a supplementary tension spring assembly - Google Patents

Connector assembly for a supplementary tension spring assembly Download PDF

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Publication number
WO2007138448A1
WO2007138448A1 PCT/IB2007/001390 IB2007001390W WO2007138448A1 WO 2007138448 A1 WO2007138448 A1 WO 2007138448A1 IB 2007001390 W IB2007001390 W IB 2007001390W WO 2007138448 A1 WO2007138448 A1 WO 2007138448A1
Authority
WO
WIPO (PCT)
Prior art keywords
connector assembly
tension spring
spring assembly
leaf spring
assembly
Prior art date
Application number
PCT/IB2007/001390
Other languages
French (fr)
Inventor
William Wilfred Spencer
Original Assignee
William Wilfred Spencer
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by William Wilfred Spencer filed Critical William Wilfred Spencer
Publication of WO2007138448A1 publication Critical patent/WO2007138448A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
    • B60G11/32—Resilient suspensions characterised by arrangement, location or kind of springs having springs of different kinds
    • B60G11/34—Resilient suspensions characterised by arrangement, location or kind of springs having springs of different kinds including leaf springs
    • B60G11/36—Resilient suspensions characterised by arrangement, location or kind of springs having springs of different kinds including leaf springs and also helical, spiral or coil springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/11—Leaf spring
    • B60G2202/112—Leaf spring longitudinally arranged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/12—Wound spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/12—Wound spring
    • B60G2202/122—Wound spring subjected to tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
    • B60G2204/43—Fittings, brackets or knuckles
    • B60G2204/4306—Bracket or knuckle for rigid axles, e.g. for clamping

Definitions

  • This invention relates to a connector assembly for connecting a supplementary tension spring assembly to an axle-mounted leaf spring assembly of a vehicle.
  • a typical tension spring assembly comprises a tension spring defining a first end and a second end, with threaded rods extending from the first and second ends of the tension spring.
  • a first connector assembly is provided to connect the threaded rod of the first end of the tension spring to the region where the leaf spring is bolted to an axle of the vehicle.
  • a second connector assembly is provided to connect the threaded rod of the second end of the tension spring to the end of the leaf spring, and in particular, around the eye of the leaf spring.
  • first and second connector assemblies There are a number of problems with the typical first and second connector assemblies described above.
  • first connector assemblies for example, the axle may either extend under the leaf spring or above it, which in turn each requires a different first connector assembly, which is clearly undesirable.
  • second connector assemblies for example, it has proven quite difficult to provide a connector assembly that may securely be fitted to the end of the leaf spring, and yet at the same time not hinder the flexing of the leaf
  • CONFIRMATIOM COPY spring in any significant manner.
  • leaf spring eye diameters that need to be catered for.
  • a first connector assembly for connecting a first end of a supplementary tension spring assembly to an axle-mounted leaf spring assembly of a vehicle, the tension spring assembly comprising a tension spring defining the first end, with a threaded rod extending from the first end of the tension spring, wherein proximate to the first end of the tension spring the leaf spring assembly is secured to a vehicle axle by a securing arrangement, the first connector assembly comprising:
  • each arm comprising a first portion that, in use, is substantially aligned with the leaf spring assembly, and a second portion that, in use, extends substantially transversely relative to the leaf spring assembly;
  • first spacer element that connects together the first portions of the pair of L-shaped arms, the first spacer element, in use, being arranged to abut against the securing arrangement so as to anchor the first connector assembly behind the securing arrangement relative to the tension spring assembly;
  • a second spacer element that connects together the second portions of the pair of L- shaped arms, the second spacer element defining an aperture for receiving the threaded rod extending from at least the first end of the tension spring.
  • the first portions of the pair of L-shaped arms define a plurality of aligned spaced apart apertures for receiving the first spacer.
  • the second portions of the pair of L-shaped arms define a plurality of aligned spaced apart apertures for receiving the second spacer.
  • the first portions of the arms are sized to accommodate the securing arrangement therebetween, and the second portions of the arms are sized to accommodate the leaf spring assembly therebetween.
  • the second spacer element connects together the second portions of the pair of L-shaped arms via a pair of intermediate link plates.
  • At least one support strut extends between the first and second portions of one of the L-shaped arms.
  • a second connector assembly for connecting a second end of a supplementary tension spring assembly to an axle-mounted leaf spring assembly of a vehicle, at least one end of the leaf spring assembly terminating in an eye arrangement, the tension spring assembly comprising a tension spring defining the second end, with a threaded rod extending from the second end of the tension spring, the second connector assembly comprising:
  • bracket arrangement defining:
  • At least one retaining bracket extending on at least one side of the leaf spring assembly for connecting the first end of the bracket arrangement and the second end of the bracket arrangement.
  • each retaining bracket defines at least two apertures, one corresponding to the first end of the bracket arrangement and another corresponding to the second end of the bracket arrangement.
  • the bracket arrangement may further comprise at least two securing bolts for securing the retaining brackets to each other and to the first and second ends of the bracket arrangement.
  • the first end of the bracket arrangement comprises:
  • an L-shaped terminating element comprising a base and a tail plate, the tail plate defining an aperture for receiving the threaded rod extending from the second end of the tension spring:
  • securing means for securing the L-shaped terminating element and the top plate to each other.
  • a recess is formed in the L-shaped terminating element and/or the top plate for receiving one of the securing bolts.
  • the second end defines a rolled eye for receiving one of the securing bolts, the rolled eye extending between a pair of retaining brackets.
  • Figure 1 shows a perspective view of a first connector assembly according to a first embodiment of the present invention.
  • Figures 2(a) and 2(b) show, respectively, a side view and a top view of an arm that is used in the first connector assembly shown in Figure 1 ;
  • Figure 3 shows the first connector assembly in use with an axle- mounted leaf spring assembly of a vehicle, wherein the axle is mounted below the leaf spring assembly;
  • Figure 4 shows the first connector assembly in use with an axle- mounted leaf spring assembly of a vehicle, wherein the axle is mounted above the leaf spring assembly;
  • Figures 4(a) and 4(b) show, respectively, perspective and cross-sectional end views of a variation of the first connector assembly shown in Figure 4 in which use is made of a pair of link plates;
  • Figure 5 shows a perspective view of a connection bracket that may be used in conjunction with the pair of link plates shown in Figures 4(a) and 4(b);
  • Figure 6 shows the connection bracket of Figure 5 in use with the first connector assembly shown in Figure 3;
  • Figure 7 shows the connection bracket of Figure 5 in use with the first connector assembly shown in Figure 4;
  • Figures 8(a) and 8(b) show, respectively, a side view and a top view of a second connector assembly according to a second embodiment of the present invention.
  • Figures 9(a) and 9(b) show respectively, a side view and a top view of a second connector assembly according to a third embodiment of the invention.
  • a first connector assembly 10 for connecting a first end 12 of a supplementary tension spring assembly 13 to an axle-mounted leaf spring assembly 14 of a vehicle.
  • the tension spring assembly 13 comprises a tension spring 16 defining the first end 12, with a threaded rod (not shown) of the tension spring 16 extending from the first end 12 of the tension spring 16 and being connected to the first connector assembly 10 via a cap screw 18.
  • the leaf spring assembly 14 is secured to a vehicle axle 20 by a securing arrangement 22.
  • the securing arrangement 22 comprises a pair of U-bolts 24, 26 that clamp the leaf spring assembly 14 and the axle 20 together using a clamping plate 28.
  • Figure 3 shows the arrangement in which the axle 20 is mounted below the leaf spring assembly 14
  • Figure 4 shows the arrangement in which the axle 20 is mounted above the leaf spring assembly 14.
  • the first connector assembly 10 can be used in both arrangements.
  • the first connector assembly 10 comprises a pair of spaced apart substantially L-shaped arms 30, 32.
  • Each arm 30, 32 comprises a first portion 3OA, 32A that, in use, is substantially aligned with the leaf spring assembly 14, as shown in Figures 3 and 4, and a second portion 3OB, 32B, that in use, extends substantially transversely relative to the leaf spring assembly 14.
  • support braces 33 may be welded to each arm 30, 32, extending between the ends of the second portions 3OB, 32B and substantially midway long the first portions 3OA, 32A, as shown in Figure 2(a).
  • the first connector assembly 10 further comprises a first spacer element 34 that connects together the first portions 3OA, 32A of the pair of L-shaped arms 30, 32.
  • the first spacer element 34 in use, is arranged to abut against the securing arrangement 22, and in particular against the pair of U-bolts 24, 26, as shown in Figures 3 and 4. This serves to anchor the first connector assembly 10 behind securing arrangement 22 relative to the tension spring assembly 13.
  • the first connector assembly 10 further comprises a second spacer element 36, in the form of a solid steel roller, which connects together the second portions 3OB, 32B of the pair of L- shaped arms 30, 32.
  • the second spacer element 36 is fitted with the cap screw 18 to receive the threaded rod (not shown) extending from the first end of the tension spring assembly 13.
  • first portions 3OA, 32A of the pair of L-shaped arms 30, 32 define a plurality of aligned shaped apart apertures 4OA, 42A, 4OB, 42B and 42C, 42C for receiving the first spacer element 34.
  • This arrangement conveniently allows the position of the first spacer element 34 along the first portions 3OA, 3OB to be variable.
  • the second portions 3OB, 32B of the pair of L-shaped arms 30, 32 define a plurality of aligned spaced apart apertures 46A, 46B for receiving the second spacer element 36.
  • additional aligned spaced apart apertures 48A, 48B and 5OA, 5OB may be provided to receive additional spacer elements 52, 54.
  • Spacer element 52 is used to impart rigidity and strength to the second portions 3OB, 32B of the L-shaped arms 30, 32. Spacer element 52 fits on top of the main blade 56 of the leaf spring assembly 14 to ensure that the tension spring assembly 13 is spaced a minimum height above the leaf spring assembly 14.
  • the first portions 3OA, 32A of the arms 30, 32 are sized to accommodate the securing arrangement 22 therebetween, and the second portions 3OB, 32B of the arms 30, 32 are sized to accommodate the leaf spring assembly 14 therebetween.
  • the width between the second portions 3OB, 32B of the L-shaped arms 30, 32 is less than the width between the first portions 3OA, 32A of the L-shaped arms 30, 32, as can be clearly seen in the top view of arm 32 in Figure 2(b).
  • each link plate 58, 59 defines an upper aperture 58A, 59A for allowing the link plate 58, 59 to be fitted to one of the apertures 40A, 4OB or 4OC, and 42A, 42B and 42C, respectively using short bolt connectors 110A, 110B.
  • Each link plate 58, 59 further defines a lower aperture 58B, 59B for receiving the first spacer element 34 therebetween.
  • connection bracket 60 that may be used in conjunction with the pair of link plates 58, 59 shown in Figures 4(a) and 4(b), its primary purpose being to cater for a variety of leaf spring assemblies.
  • the connection bracket 60 comprises a base plate 6OA terminating in a scrolled eye 6OB, and a bracket plate 6OC fitted to the base plate 6OA.
  • a plurality of apertures are defined in the bracket plate 6OC so to receive a plurality of bolts to allow the bracket plate 6OC to be connected to an uppermost securing plate 6OD.
  • connection bracket 60 may be used either with the first connector assembly 10 shown in Figure 3, wherein the axle 20 is mounted below the leaf spring assembly 14, or with the first connector assembly 10 shown in Figure 4, wherein the axle 20 is mounted above the leaf spring assembly 14.
  • connection bracket 60 may be reversed so that the bracket plate 6OC faces towards the axle 20, and not away as currently shown in Figures 6 and 7.
  • FIG. 8(a) and 8(b) a second aspect of the invention is shown comprising a second connector assembly 61 for connecting a second end 62 of a supplementary tension spring assembly 13 to an axle-mounted leaf spring assembly 14 of a vehicle, at least one end of the leaf spring assembly 14 terminating in an eye arrangement 64.
  • the tension spring assembly 13 comprises a tension spring 16 defining the second end 62, with a threaded rod 66 extending from the second end 62 of the tension spring 16.
  • the second connector assembly 61 comprises a bracket arrangement 68 defining a first end 70 for receiving the threaded rod 66 extending from the second end 62 of the tension spring 16, the first end 70 being locatable operatively above the leaf assembly 14.
  • the bracket arrangement 68 further defines a second end 72 that is locatable operatively below the leaf spring assembly 14, and an intermediate socket section 74 extending between the first and second ends 70, 72 for receiving and accommodating the eye arrangement 64 of the leaf spring assembly 14.
  • a pair of retaining brackets 76, 78 extends on either side of the leaf spring assembly 14 for connecting the first end 70 of the bracket arrangement 68 to the second end 72 of the bracket arrangement 68.
  • the retaining bracket 78 has been omitted for clarity.
  • each retaining bracket 76, 78 defines at least two apertures, one corresponding to the first end 70 of the bracket arrangement 68 and another corresponding to the second end 72 of the bracket arrangement 68.
  • the bracket arrangement 68 may further comprise at least two securing bolts 80, 82 for securing the retaining brackets 76, 78 to each other and to the first and second ends 70, 72 of the bracket arrangement 68.
  • the first end 70 of the bracket arrangement 68 comprises an L-shaped terminating element 84 comprising a base 86 and a tail plate 88, the tail plate 88 defining an aperture for receiving the threaded rod 66 extending from the second end of the tension spring 16.
  • the threaded rod 66 may be secured in position by means of a nut 89.
  • the first end 70 of the bracket arrangement 68 further comprises a top plate 90 extending from the intermediate socket section 74, the L-shaped terminating element 84 and the top plate 90 being arranged to overlap each other.
  • Securing means in the form of a plurality of bolts and nuts 92, 94, 96 and 98, is used to secure the L-shaped terminating element 84 and the top plate 90 to each other.
  • a recess 100 is formed in the L-shaped terminating element and/or the top plate for receiving securing bolt 80.
  • the second end 72 defines a rolled eye 102 for receiving securing bolt 82, the rolled eye 102 extending between the pair of retaining brackets 76, 78.
  • FIGS 9(a) and 9(b) show a further embodiment of a second connector assembly 1.04, which is substantially similar to the second connector assembly 61 described above with reference to Figures 8(a) and 8(b). Identical components have been labelled identically, and their associated descriptions will not be repeated here.
  • the second connector assembly 104 comprises a bracket arrangement 106 defining a first end 108 for receiving the threaded rod extending from the tension spring, the first end 108 being locatable operatively above the leaf spring assembly 14.
  • the bracket arrangement 106 further defines a second end 110 that is locatable operatively below the leaf spring assembly 14, and an intermediate socket section 112 extending between the first and second ends 108, 110 for receiving and accommodating the eye arrangement 64 of the leaf spring assembly 14.
  • a pair of retaining, L-shaped support plates 114, 116 extends on either side of the leaf spring assembly 14 in an overlapping arrangement, for connecting the first end 108 of the bracket arrangement 106 to the second end 110 of the bracket arrangement 106.
  • Each support plate 114, 116 defines varying sized slots for accommodating varying sized leaf spring blade widths.
  • each support plate 114, 116 defines an aperture for receiving a retaining bolt 118 and nut 120 for securing the support plates 114 and 116 to each other and for securing together the first and second ends 108, 110 of the bracket arrangement 106.
  • the first end 108 of the bracket arrangement 106 comprises an L-shaped terminating element 122 comprising a base 124 and a tail plate 126, the tail plate 126 defining an aperture for receiving the threaded rod extending from the tension spring.
  • the first end 108 of the bracket arrangement 106 further comprises a bottom plate 128 extending from the intermediate socket section 112, the L-shaped terminating element 122 and the bottom plate 128 being arranged to overlap each other.
  • Securing means in the form of a plurality of bolts and nuts 92, 94, 96 and 98, is used to secure the L-shaped terminating element 12 2 and the bottom plate 128 to each other.
  • the second end 110 defines a rolled eye 130 for receiving securing bolt 118, the rolled eye 130 extending between the pair of support plates 114, 116.
  • the present invention extends to a method of fitting a connector assembly comprising the first connector assembly 10 and either one of the second connector assemblies 61 , 104.
  • the method comprises locating the first .connector assembly 10 in position, either above or below the axle, as the case may be, ensuring no interference with brake fluid pipes and/or hand brake wires that may be present.
  • the ends of the arms are then connected together, as shown in any one of Figures 1 , 3, 4, 4(a), 6 or 7.
  • the second connector 61 , 104 is then fitted around the eye arrangement 64 of the free end of the leaf spring assembly 14.
  • the tension spring 16 is then connected to the roller bearing spacer element 36, with the threaded rod 66 then being connected through the eye of the spring and tensioned appropriately.

Abstract

A first connector assembly (10) for connecting a first end (12) of a supplementary tension spring assembly (13) to an axle-mounted leaf spring assembly (14) of a vehicle is disclosed, the tension spring assembly (13) comprising a tension spring (16) defining the first end (12). The first connector assembly (10) comprises a pair of spaced apart substantially L-shaped arms (30,32), each arm comprising a first portion (3OA, 32A) that, in use, is substantially aligned with the leaf spring assembly (14), and a second portion (3OB, 32B) that, in use, extends substantially transversely relative to the leaf spring assembly (14). The first connector assembly (10) further comprises a first spacer element (34) that connects together the first portions (3OA, 32A) of the pair of L-shaped arms (30,32), the first spacer element (34), in use, being arranged to abut against a securing arrangement (22) so as to anchor the first connector assembly (10) behind the securing arrangement (22) relative to the tension spring assembly (13). A second spacer element (36) is provided, which connects together the second portions (3OB, 32B) of the pair of L-shaped arms (30,32).

Description

CONNECTOR ASSEMBLY FOR A SUPPLEMENTARY TENSION SPRING ASSEMBLY
BACKGROUND OF THE INVENTION
This invention relates to a connector assembly for connecting a supplementary tension spring assembly to an axle-mounted leaf spring assembly of a vehicle.
The use of tension spring assemblies to supplement the compressive resistance of vehicle leaf springs is well known. A typical tension spring assembly comprises a tension spring defining a first end and a second end, with threaded rods extending from the first and second ends of the tension spring. A first connector assembly is provided to connect the threaded rod of the first end of the tension spring to the region where the leaf spring is bolted to an axle of the vehicle. Similarly, a second connector assembly is provided to connect the threaded rod of the second end of the tension spring to the end of the leaf spring, and in particular, around the eye of the leaf spring.
There are a number of problems with the typical first and second connector assemblies described above. With typical first connector assemblies, for example, the axle may either extend under the leaf spring or above it, which in turn each requires a different first connector assembly, which is clearly undesirable. With typical second connector assemblies, for example, it has proven quite difficult to provide a connector assembly that may securely be fitted to the end of the leaf spring, and yet at the same time not hinder the flexing of the leaf
CONFIRMATIOM COPY spring in any significant manner. In addition, there are a variety of leaf spring eye diameters that need to be catered for.
It is therefore an aim of the present invention to provide a connector assembly to connect a supplementary tension spring assembly to a leaf spring that addresses the problems described above.
SUMMARY OF THE INVENTION
According to a first aspect of the invention there is provided a first connector assembly for connecting a first end of a supplementary tension spring assembly to an axle-mounted leaf spring assembly of a vehicle, the tension spring assembly comprising a tension spring defining the first end, with a threaded rod extending from the first end of the tension spring, wherein proximate to the first end of the tension spring the leaf spring assembly is secured to a vehicle axle by a securing arrangement, the first connector assembly comprising:
a pair of spaced apart substantially L-shaped arms, each arm comprising a first portion that, in use, is substantially aligned with the leaf spring assembly, and a second portion that, in use, extends substantially transversely relative to the leaf spring assembly;
a first spacer element that connects together the first portions of the pair of L-shaped arms, the first spacer element, in use, being arranged to abut against the securing arrangement so as to anchor the first connector assembly behind the securing arrangement relative to the tension spring assembly; and
a second spacer element that connects together the second portions of the pair of L- shaped arms, the second spacer element defining an aperture for receiving the threaded rod extending from at least the first end of the tension spring.
Conveniently, the first portions of the pair of L-shaped arms define a plurality of aligned spaced apart apertures for receiving the first spacer.
Similarly, the second portions of the pair of L-shaped arms define a plurality of aligned spaced apart apertures for receiving the second spacer. Preferably, the first portions of the arms are sized to accommodate the securing arrangement therebetween, and the second portions of the arms are sized to accommodate the leaf spring assembly therebetween.
In an example embodiment, the second spacer element connects together the second portions of the pair of L-shaped arms via a pair of intermediate link plates.
In one version, at least one support strut extends between the first and second portions of one of the L-shaped arms.
According to a second aspect of the invention there is provided a second connector assembly for connecting a second end of a supplementary tension spring assembly to an axle-mounted leaf spring assembly of a vehicle, at least one end of the leaf spring assembly terminating in an eye arrangement, the tension spring assembly comprising a tension spring defining the second end, with a threaded rod extending from the second end of the tension spring, the second connector assembly comprising:
a bracket arrangement defining:
a first end for receiving the threaded rod extending, from the second end of the tension spring, the first end being locatable operatively above the leaf spring assembly;
a second end being locatable operatively below the leaf spring assembly; and
an intermediate socket section extending between the first and second ends for receiving and accommodating the eye arrangement of the leaf spring assembly,
at least one retaining bracket extending on at least one side of the leaf spring assembly for connecting the first end of the bracket arrangement and the second end of the bracket arrangement.
Typically, each retaining bracket defines at least two apertures, one corresponding to the first end of the bracket arrangement and another corresponding to the second end of the bracket arrangement. The bracket arrangement may further comprise at least two securing bolts for securing the retaining brackets to each other and to the first and second ends of the bracket arrangement.
Conveniently, the first end of the bracket arrangement comprises:
an L-shaped terminating element comprising a base and a tail plate, the tail plate defining an aperture for receiving the threaded rod extending from the second end of the tension spring:
a top plate extending from the intermediate socket section, the L-shaped terminating element and the top plate being arranged to overlap each other; and
securing means for securing the L-shaped terminating element and the top plate to each other.
Advantageously, in one version of the invention, a recess is formed in the L-shaped terminating element and/or the top plate for receiving one of the securing bolts.
Preferably, the second end defines a rolled eye for receiving one of the securing bolts, the rolled eye extending between a pair of retaining brackets.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows a perspective view of a first connector assembly according to a first embodiment of the present invention.
Figures 2(a) and 2(b) show, respectively, a side view and a top view of an arm that is used in the first connector assembly shown in Figure 1 ;
Figure 3 shows the first connector assembly in use with an axle- mounted leaf spring assembly of a vehicle, wherein the axle is mounted below the leaf spring assembly;
Figure 4 shows the first connector assembly in use with an axle- mounted leaf spring assembly of a vehicle, wherein the axle is mounted above the leaf spring assembly; Figures 4(a) and 4(b) show, respectively, perspective and cross-sectional end views of a variation of the first connector assembly shown in Figure 4 in which use is made of a pair of link plates;
Figure 5 shows a perspective view of a connection bracket that may be used in conjunction with the pair of link plates shown in Figures 4(a) and 4(b);
Figure 6 shows the connection bracket of Figure 5 in use with the first connector assembly shown in Figure 3;
Figure 7 shows the connection bracket of Figure 5 in use with the first connector assembly shown in Figure 4;
Figures 8(a) and 8(b) show, respectively, a side view and a top view of a second connector assembly according to a second embodiment of the present invention; and
Figures 9(a) and 9(b) show respectively, a side view and a top view of a second connector assembly according to a third embodiment of the invention.
DETAILED DESCRIPTION OF THE DRAWINGS
Referring to Figures 1 to 4, a first connector assembly 10 is shown for connecting a first end 12 of a supplementary tension spring assembly 13 to an axle-mounted leaf spring assembly 14 of a vehicle. The tension spring assembly 13 comprises a tension spring 16 defining the first end 12, with a threaded rod (not shown) of the tension spring 16 extending from the first end 12 of the tension spring 16 and being connected to the first connector assembly 10 via a cap screw 18.
Proximate the first end 12 of the tension spring assembly 13, the leaf spring assembly 14 is secured to a vehicle axle 20 by a securing arrangement 22. Typically, the securing arrangement 22 comprises a pair of U-bolts 24, 26 that clamp the leaf spring assembly 14 and the axle 20 together using a clamping plate 28. Figure 3 shows the arrangement in which the axle 20 is mounted below the leaf spring assembly 14, and Figure 4 shows the arrangement in which the axle 20 is mounted above the leaf spring assembly 14. Significantly, the first connector assembly 10 can be used in both arrangements.
The first connector assembly 10 comprises a pair of spaced apart substantially L-shaped arms 30, 32. Each arm 30, 32 comprises a first portion 3OA, 32A that, in use, is substantially aligned with the leaf spring assembly 14, as shown in Figures 3 and 4, and a second portion 3OB, 32B, that in use, extends substantially transversely relative to the leaf spring assembly 14.
In one version of the invention, support braces 33 may be welded to each arm 30, 32, extending between the ends of the second portions 3OB, 32B and substantially midway long the first portions 3OA, 32A, as shown in Figure 2(a).
The first connector assembly 10 further comprises a first spacer element 34 that connects together the first portions 3OA, 32A of the pair of L-shaped arms 30, 32. The first spacer element 34, in use, is arranged to abut against the securing arrangement 22, and in particular against the pair of U-bolts 24, 26, as shown in Figures 3 and 4. This serves to anchor the first connector assembly 10 behind securing arrangement 22 relative to the tension spring assembly 13.
The first connector assembly 10 further comprises a second spacer element 36, in the form of a solid steel roller, which connects together the second portions 3OB, 32B of the pair of L- shaped arms 30, 32. The second spacer element 36 is fitted with the cap screw 18 to receive the threaded rod (not shown) extending from the first end of the tension spring assembly 13.
Conveniently the first portions 3OA, 32A of the pair of L-shaped arms 30, 32 define a plurality of aligned shaped apart apertures 4OA, 42A, 4OB, 42B and 42C, 42C for receiving the first spacer element 34. This arrangement conveniently allows the position of the first spacer element 34 along the first portions 3OA, 3OB to be variable.
Similarly, the second portions 3OB, 32B of the pair of L-shaped arms 30, 32 define a plurality of aligned spaced apart apertures 46A, 46B for receiving the second spacer element 36. Conveniently, additional aligned spaced apart apertures 48A, 48B and 5OA, 5OB may be provided to receive additional spacer elements 52, 54. Spacer element 52 is used to impart rigidity and strength to the second portions 3OB, 32B of the L-shaped arms 30, 32. Spacer element 52 fits on top of the main blade 56 of the leaf spring assembly 14 to ensure that the tension spring assembly 13 is spaced a minimum height above the leaf spring assembly 14.
Preferably, the first portions 3OA, 32A of the arms 30, 32 are sized to accommodate the securing arrangement 22 therebetween, and the second portions 3OB, 32B of the arms 30, 32 are sized to accommodate the leaf spring assembly 14 therebetween. Thus, the width between the second portions 3OB, 32B of the L-shaped arms 30, 32 is less than the width between the first portions 3OA, 32A of the L-shaped arms 30, 32, as can be clearly seen in the top view of arm 32 in Figure 2(b).
In certain arrangements, and in particular when the axle 20 is on top of the leaf spring assembly 14, it may be that the apertures 4OA, 42A, 40B, 42B, 4OC and 42C are aligned with the blades of the leaf spring assembly 14, thereby preventing the direct connection of the first spacer element 34. In this case, use may be made of a pair of link plates 58 and 59, as shown in Figures 1 , 4(a) and 4(b). Each link plate 58, 59 defines an upper aperture 58A, 59A for allowing the link plate 58, 59 to be fitted to one of the apertures 40A, 4OB or 4OC, and 42A, 42B and 42C, respectively using short bolt connectors 110A, 110B. Each link plate 58, 59 further defines a lower aperture 58B, 59B for receiving the first spacer element 34 therebetween.
Turning now to Figures 5 to 7, a connection bracket 60 is shown that may be used in conjunction with the pair of link plates 58, 59 shown in Figures 4(a) and 4(b), its primary purpose being to cater for a variety of leaf spring assemblies. The connection bracket 60 comprises a base plate 6OA terminating in a scrolled eye 6OB, and a bracket plate 6OC fitted to the base plate 6OA. A plurality of apertures are defined in the bracket plate 6OC so to receive a plurality of bolts to allow the bracket plate 6OC to be connected to an uppermost securing plate 6OD. The connection bracket 60 may be used either with the first connector assembly 10 shown in Figure 3, wherein the axle 20 is mounted below the leaf spring assembly 14, or with the first connector assembly 10 shown in Figure 4, wherein the axle 20 is mounted above the leaf spring assembly 14. Advantageously, for versatility, the connection bracket 60 may be reversed so that the bracket plate 6OC faces towards the axle 20, and not away as currently shown in Figures 6 and 7.
Turning now to Figures 8(a) and 8(b), a second aspect of the invention is shown comprising a second connector assembly 61 for connecting a second end 62 of a supplementary tension spring assembly 13 to an axle-mounted leaf spring assembly 14 of a vehicle, at least one end of the leaf spring assembly 14 terminating in an eye arrangement 64. The tension spring assembly 13 comprises a tension spring 16 defining the second end 62, with a threaded rod 66 extending from the second end 62 of the tension spring 16.
The second connector assembly 61 comprises a bracket arrangement 68 defining a first end 70 for receiving the threaded rod 66 extending from the second end 62 of the tension spring 16, the first end 70 being locatable operatively above the leaf assembly 14. The bracket arrangement 68 further defines a second end 72 that is locatable operatively below the leaf spring assembly 14, and an intermediate socket section 74 extending between the first and second ends 70, 72 for receiving and accommodating the eye arrangement 64 of the leaf spring assembly 14.
A pair of retaining brackets 76, 78 extends on either side of the leaf spring assembly 14 for connecting the first end 70 of the bracket arrangement 68 to the second end 72 of the bracket arrangement 68. In Figure 8(a), the retaining bracket 78 has been omitted for clarity.
Typically, each retaining bracket 76, 78 defines at least two apertures, one corresponding to the first end 70 of the bracket arrangement 68 and another corresponding to the second end 72 of the bracket arrangement 68. The bracket arrangement 68 may further comprise at least two securing bolts 80, 82 for securing the retaining brackets 76, 78 to each other and to the first and second ends 70, 72 of the bracket arrangement 68.
Conveniently, the first end 70 of the bracket arrangement 68 comprises an L-shaped terminating element 84 comprising a base 86 and a tail plate 88, the tail plate 88 defining an aperture for receiving the threaded rod 66 extending from the second end of the tension spring 16. The threaded rod 66 may be secured in position by means of a nut 89. The first end 70 of the bracket arrangement 68 further comprises a top plate 90 extending from the intermediate socket section 74, the L-shaped terminating element 84 and the top plate 90 being arranged to overlap each other. Securing means, in the form of a plurality of bolts and nuts 92, 94, 96 and 98, is used to secure the L-shaped terminating element 84 and the top plate 90 to each other. Advantageously, a recess 100 is formed in the L-shaped terminating element and/or the top plate for receiving securing bolt 80.
Preferably, the second end 72 defines a rolled eye 102 for receiving securing bolt 82, the rolled eye 102 extending between the pair of retaining brackets 76, 78.
Figures 9(a) and 9(b) show a further embodiment of a second connector assembly 1.04, which is substantially similar to the second connector assembly 61 described above with reference to Figures 8(a) and 8(b). Identical components have been labelled identically, and their associated descriptions will not be repeated here. The second connector assembly 104 comprises a bracket arrangement 106 defining a first end 108 for receiving the threaded rod extending from the tension spring, the first end 108 being locatable operatively above the leaf spring assembly 14. The bracket arrangement 106 further defines a second end 110 that is locatable operatively below the leaf spring assembly 14, and an intermediate socket section 112 extending between the first and second ends 108, 110 for receiving and accommodating the eye arrangement 64 of the leaf spring assembly 14.
A pair of retaining, L-shaped support plates 114, 116 extends on either side of the leaf spring assembly 14 in an overlapping arrangement, for connecting the first end 108 of the bracket arrangement 106 to the second end 110 of the bracket arrangement 106. Each support plate 114, 116 defines varying sized slots for accommodating varying sized leaf spring blade widths.
Typically, each support plate 114, 116 defines an aperture for receiving a retaining bolt 118 and nut 120 for securing the support plates 114 and 116 to each other and for securing together the first and second ends 108, 110 of the bracket arrangement 106.
Conveniently, the first end 108 of the bracket arrangement 106 comprises an L-shaped terminating element 122 comprising a base 124 and a tail plate 126, the tail plate 126 defining an aperture for receiving the threaded rod extending from the tension spring. The first end 108 of the bracket arrangement 106 further comprises a bottom plate 128 extending from the intermediate socket section 112, the L-shaped terminating element 122 and the bottom plate 128 being arranged to overlap each other. Securing means, in the form of a plurality of bolts and nuts 92, 94, 96 and 98, is used to secure the L-shaped terminating element 12 2 and the bottom plate 128 to each other. Preferably, the second end 110 defines a rolled eye 130 for receiving securing bolt 118, the rolled eye 130 extending between the pair of support plates 114, 116.
Although not explicitly illustrated, the present invention extends to a method of fitting a connector assembly comprising the first connector assembly 10 and either one of the second connector assemblies 61 , 104. The method comprises locating the first .connector assembly 10 in position, either above or below the axle, as the case may be, ensuring no interference with brake fluid pipes and/or hand brake wires that may be present. The ends of the arms are then connected together, as shown in any one of Figures 1 , 3, 4, 4(a), 6 or 7. The second connector 61 , 104 is then fitted around the eye arrangement 64 of the free end of the leaf spring assembly 14. The tension spring 16 is then connected to the roller bearing spacer element 36, with the threaded rod 66 then being connected through the eye of the spring and tensioned appropriately.
The connector assemblies described above have the following advantages:
1. They can be used both where the axle is under the leaf spring assembly and where the axle is above the leaf spring assembly. This provides flexibility in terms of manufacture and sales.
2. There is no need to remove any existing component, such as the U-bolts.
3. They are highly adjustable to cater for variations in the width of leaf spring blades.

Claims

1. A first connector assembly for connecting a first end of a supplementary tension spring assembly to an axle-mounted leaf spring assembly of a vehicle, the tension spring assembly comprising a tension spring defining the first end, with a threaded rod extending from the first end of the tension spring, wherein proximate to the first end of the tension spring the leaf spring assembly is secured to a vehicle axle by a securing arrangement, the first connector assembly comprising:
a pair of spaced apart substantially L-shaped arms, each arm comprising a first portion that, in use, is substantially aligned with the leaf spring assembly, and a second portion that, in use, extends substantially transversely relative to the leaf spring assembly;
a first spacer element that connects together the first portions of the pair of L- shaped arms, the first spacer element, in use, being arranged to abut against the securing arrangement so as to anchor the first connector assembly behind the securing arrangement relative to the tension spring assembly; and
a second spacer element that connects together the second portions of the pair of L-shaped arms, the second spacer element defining an aperture for receiving the threaded rod extending from at least the first end of the tension spring.
2. A first connector assembly according to claim 1 , wherein the first portions of the pair of L-shaped arms define a plurality of aligned spaced apart apertures for receiving the first spacer.
3. A first connector assembly according to either claim 1 or claim 2, wherein the second portions of the pair of L-shaped arms define a plurality of aligned spaced apart apertures for receiving the second spacer.
4. A first connector assembly according to any one of the preceding claims, wherein the first portions of the arms are sized to accommodate the securing arrangement therebetween, and the second portions of the arms are sized to accommodate the leaf spring assembly therebetween.
5. A first connector assembly according to any one of the preceding claims, wherein the second spacer element connects together the second portions of the pair of L-shaped arms via a pair of intermediate link plates.
6. A first connector assembly according to any one of the preceding claims, wherein at least one support strut extends between the first and second portions of one of the L- shaped arms.
7. A second connector assembly for connecting a second end of a supplementary tension spring assembly to an axle-mounted leaf spring assembly of a vehicle, at least one end of the leaf spring assembly terminating in an eye arrangement, the tension spring assembly comprising a tension spring defining the second end, with a threaded rod extending from the second end of the tension spring, the second connector assembly comprising:
a bracket arrangement defining:
a first end for receiving the threaded rod extending from the second end of the tension spring, the first end being locatable operatively above the leaf spring assembly;
a second end being locatable operatively below the leaf spring assembly; and
an intermediate socket section extending between the first and second ends for receiving and accommodating the eye arrangement of the leaf spring assembly,
at least one retaining bracket extending on at least one side of the leaf spring assembly for connecting the first end of the bracket arrangement and the second end of the bracket arrangement.
8. A second connector assembly according to claim 7, wherein each retaining bracket defines at least two apertures, one corresponding to the first end of the bracket arrangement and another corresponding to the second end of the bracket arrangement.
9. A second connector assembly according to claim 7, wherein the first end of the bracket arrangement comprises:
an L-shaped terminating element comprising a base and a tail plate, the tail plate defining an aperture for receiving the threaded rod extending from the second end of the tension spring:
a top plate extending from the intermediate socket section, the L-shaped terminating element and the top plate being arranged to overlap each other; and
securing means for securing the L-shaped terminating element and the top plate to each other.
10. A second connector assembly according to claim 9, wherein a recess is formed in the L-shaped terminating element and/or the top plate for receiving the securing means.
11. A second connector assembly according to claim 9, wherein the second end defines a rolled eye for receiving the securing means, the rolled eye extending between a pair of retaining brackets.
12 A connector assembly for connecting a supplementary tension spring assembly to an axle-mounted leaf spring assembly of a vehicle, the connector assembly comprising a first connector assembly as defined in any one of claims 1 to 6 and a second connector assembly as defined in any one of claims 7 to 11.
PCT/IB2007/001390 2006-05-29 2007-05-29 Connector assembly for a supplementary tension spring assembly WO2007138448A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA200604354 2006-05-29
ZA2006/04354 2006-05-29

Publications (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010119402A1 (en) * 2009-04-14 2010-10-21 William Wilfred Spencer A supplementary vehicle spring assembly

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR406680A (en) * 1909-08-31 1910-02-05 Conrad Fehr Elastic suspension for vehicles
US1465341A (en) * 1922-09-18 1923-08-21 Burgess Sydney Shock absorber
GB734886A (en) * 1953-04-23 1955-08-10 Toledo Woodhead Springs Ltd Improvements in the springing of vehicles
EP0663307A1 (en) * 1994-01-12 1995-07-19 William Wilfred Spencer An adjustable coil spring assembly
WO2002046640A2 (en) * 2000-12-08 2002-06-13 William Wilfred Spencer A supplementary leaf spring assembly

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR406680A (en) * 1909-08-31 1910-02-05 Conrad Fehr Elastic suspension for vehicles
US1465341A (en) * 1922-09-18 1923-08-21 Burgess Sydney Shock absorber
GB734886A (en) * 1953-04-23 1955-08-10 Toledo Woodhead Springs Ltd Improvements in the springing of vehicles
EP0663307A1 (en) * 1994-01-12 1995-07-19 William Wilfred Spencer An adjustable coil spring assembly
WO2002046640A2 (en) * 2000-12-08 2002-06-13 William Wilfred Spencer A supplementary leaf spring assembly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010119402A1 (en) * 2009-04-14 2010-10-21 William Wilfred Spencer A supplementary vehicle spring assembly

Also Published As

Publication number Publication date
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