BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the field of vehicle suspension, and while the inventive concepts may be used in a wide variety of situations, the main embodiments will be directed more particularly to a preloaded spring suited for quick change in conditions such as racing.
2. Description of the Related Art
Many drivers, especially in race situations look to streamline the process of shock absorber or spring replacement or ride height adjustment. Many times during trial runs the shock absorbing characteristics of the car are found unsuitable for conditions anticipated during the actual race. In between pre-race practice sessions or during a race break the crew has a limited amount of time to get the car ready in multiple ways before the race. The shock absorber system typically comprises a coil spring and a shock damper. For proper loading, the damper extension is often less than the travel of the spring causing a difficult and possibly dangerous situation as the crew is required to partially compress the spring ad hoc to fit with the shock. Such procedures in best of conditions requires working with a compressed spring in tight quarters allowing little room for error. Therefore, the crew would prefer a solution which pre-loads the shock in such a way as to make the fully extended position of the spring less than the travel of the shock, and to be mounted with existing shock absorber systems.
The relevant art of interest describes various devices for holding and retaining springs from their full extension, also known as preloading.
U.S. Pat. No. 2,842,355 issued to Lang filed Apr. 8, 1954 discloses a structural cartridge for a spring to be used in a v belt pulley. It provides for preloading of a spring with a cartridge having two telescoping members mounted on a solid spindle. Such a configuration does not provide for interaction with the shock absorber with some of the other quick attach and release features of the present invention.
U.S. Pat. No. 3,128,985 issued to Wallerstein, Jr filed Apr. 14, 1964 discloses a mounting device for providing a damping effect through floating shoes which are slidably and tiltably mounted to allow for some lateral deflection in the spring while still being stable. It provides a separate structure being an encasement of the spring with no provision for a central shock absorber.
U.S. Pat. No. 3,157,392 issued to Kitamura filed May 3, 1962 discloses a spring dampening device mounted approximately in the mid section of the device for putting only a part of the spring in compression. This is done to dampen resonant vibrations in the spring. This methodology does not provide for the quick change mechanism required during a racing event.
U.S. Pat. No. 3,847,380 issued to Kearns filed Feb. 20, 1973 discloses a spring having a wire lacing extending between the adjacent helices of the main spring for creating a compressive loading on the spring. This may address an issue similar to the present invention, however in a different way.
SUMMARY OF THE INVENTION
BRIEF DESCRIPTION OF THE DRAWINGS
An understanding of the present invention may be obtained by reference to the accompanying drawings, when considered in conjunction with the subsequent, detailed description, in which:
FIG. 1A shows a side view of an independent device, in this case a shock absorber assembly, which can work as part of the supporting system;
FIG. 1B shows a side view of an embodiment of a cartridge and coil assembly;
FIG. 1C shows a side view of the independent device of FIG. 1A combined with the cartridge of 1B to form a completed supporting system;
FIGS. 1D and 1E show a top and bottom view respectively of the device of FIG. 1B;
FIGS. 2 and 2C show a through section view of a cartridge assembly under full extension and under compression;
FIG. 2A shows a detail view of an interface between cannular members derived from FIG. 2;
FIG. 2B shows a detail view of the retaining portion of the cartridge assembly of FIG. 2;
FIG. 2D shows a detail view of an interface between cannular members derived from FIG. 2C;
FIGS. 3, 3A, and 3B show; side, side, and top views respectively of a shock absorber assembly typical of the prior art, with a coiled spring having an extension length greater than working length of the shock absorber assembly;
FIGS. 4A and 4B show; side and bottom views respectively an inner cannulus of the embodiment shown in FIG. 3;
FIG. 4C shows an exploded view of the inner cannulus shown in FIGS. 4A and 4B;
FIGS. 5A and 5B show; side and top views respectively an outer cannulus of the embodiment shown in FIG. 3;
FIG. 5C shows an exploded view of the outer cannulus shown in FIGS. 5A and 5B;
FIGS. 6, 6A and 6D, show side, top and bottom view respectively for an alternative embodiment of a cartridge being loaded with a spring shown in FIG. 6B;
FIG. 6C shows a side view of the cartridge of FIG. 6 wherein the spring is compressed;
FIG. 7 shows a through section view of the cartridge of FIG. 6;
FIG. 7A shows a through section derived from FIG. 6 with a shock absorber embodiment being a variation of that shown in FIG. 3 to form an embodiment of the supporting system of the present invention;
FIG. 7B shows a through section derived from FIG. 7A in compression;
FIG. 7C shows a detail view from FIG. 7 illustrating the relationship between a stop ring and a slide ring;
FIGS. 8, 8A, 8B and 8C show schematic and sectional views of apparatus for assembling various embodiments of cartridges of the present invention.
DESCRIPTION OF THE INVENTION
The supporting system assembly as shown in FIG. 1A-E shows a preferred embodiment having an inner modular sleeve 120, which can be generally described as a cannulus, lumen, or hollow sleeve of solid construction, and an outer modular sleeve 140, also described as a cannulus, lumen, or hollow sleeve of solid construction having an inner diameter sized to substantially match the outer diameter of the inner sleeve 120, and being positioned and mounted internally to the coils of a spring 100, the spring 100 being generally helical in form. Multiple flange members 124 having a pad 122 for engaging the spring 100 are typically located at the end portions of the springs 100 as shown in FIG. 2B, the flanges 124 being of sufficient diameter to engage the spring 100 and, when assembled, hold the spring in compression, or preload. An independent device 300, in this case a shock absorber, but may also include a strut, brace, damper, or the like, can be mounted coaxially with the cartridge assembly 110. In this case the shock 300, generally comprising a multiple of fasten points 312, such as eyelets suited for connecting a chassis member with a wheel member, and typically having a main body 304 and a piston rod 308 are situated coaxially with the cartridge assembly 110. In a preferred arrangement, the spring pad 302 is retracted from its seating location against the fasten point 312 and removed laterally away from the piston rod 308 via a slot cut through the section of the spring pad 302 allowing it to pass freely past the rod 308, and the device 300 is projected through the assembly 110. It is preferred that the body of the shock 304 and the inner sleeve 120 are sized and mounted to fit snuggly and move as one member as shown in FIG. 1C. After mounting the registration member 306 is attached and adjusted, typically by means of screwing down an adjusting nut onto the main body of the shock 304 which can be threaded. The position will be set as preferred by track and race conditions.
In operation, compressive forces on the vehicle (not shown) are transferred through the fasten points (312) and through the cartridge 110 and the shock 300, which generally act together as one unit. While under extended conditions when no compression is applied, a series of retaining rings, referred to here as a superior interior spiral retaining ring 164 and an inferior interior retaining ring 166, abut to limit movement of the two sleeves 120 and 140 to maintain constraint on the system to a predetermined length. Without such constraint, the extension length of the coil spring 100 would tend to be greater than the distance between the spring pad 302 and the registration (adjusting nut) 306 as illustrated in FIGS. 3 and 3B, making it difficult to replace a shock, or a spring, or adjust the ride height in race conditions.
However with the system, as compression is applied generally by the weight of the vehicle, cornering, or bumps in the road, the sleeves 120 and 140 slide with respect to one another, as shown in FIG. 2D, allowing compression of the system with regard to the coil spring 100 and shock absorber 300. It is preferred to have a series of wear bands 154, 160 and the like located at the interface between the inner sleeve 120 and the outer sleeve 140 to improve performance and wear-ability. It is anticipated in alternate embodiments that the interface points may be further provided with slidable means such as bearings, Teflon® bushings or the like in order to facilitate ease of movement
With the adjusting nut 306 riding on spring pad 124, it is preferred to have a chamfer 142 to minimize impingement. Further a mechanism is helpful to lock the spring pad 124 in place. Therefore a mechanism of a spiral retaining ring 130 followed by a tension band 128 and a spring retaining band 126 is provided to hold the spring pad 124 in place as shown in FIG. 2B and further illustrated in the exploded view of FIG. 4C. A series of retaining grooves 132, 168, 170, 172, 180 can be formed into the cartridge assembly to accommodate the holding and retaining of retaining rings 126, 130, 150, 164, 166, 156, 174, stop rings 152 wear bands 154 and the like. Those skilled in the art will appreciate the universal applicability of such a system. Further those skilled in the art will appreciate that other means, such as weldments or permanent structures can be utilized in place of the retaining ring system in several places.
In some alternate embodiments such as is shown in FIGS. 6-6D and 7-7C, the cartridge 304 can be designed to encompass the coil spring 100. In this embodiment, the adjusting nut 307 can engage with the spring pad 240 near the top of the cartridge 304. The spring pad 240 and the wear band 246 are designed to move into the cartridge 304 upon compression as is shown in FIG. 7B. The piston rod 308 then moves into the main body of the shock 304 of the independent device 300 as the fasten points 312 come closer together upon compression.
FIGS. 8 and 8B illustrate a cartridge assembly system 400. In this instance as an illustration, a cartridge assembly 110 is preassembled with a spring 100 and a spring pad 124 placed on the top. The piston 404, typically associated with a hydraulic cylinder 406, such as a single acting hydraulic cylinder known in the art, is rammed into the inner sleeve 120 of a cartridge assembly 110 causing the groove ring 132 at the top of the cartridge 110 to protrude above the frame section 402, allowing a spiral retaining ring 130 to be applied.
In an alternate embodiment shown in FIGS. 8A and 8C, the cartridge 200 can be reversed such that it abuts the frame section 402 with the piston 404 depressing the spring pad 240 allowing the spiral retaining ring 220 to be situated with the ring groove 222, thereby forming a seal.
CONCLUSION, RAMIFICATIONS, AND SCOPE
Although the present invention has been described in detail, those skilled in the art will understand that various changes, substitutions, and alterations herein may be made without departing from the spirit and scope of the invention in its broadest form.
Having thus described the invention, what is desired to be protected by Letters Patent is presented in the subsequently appended claims.
Patent Application
20100219572
