1. Field of the Invention
The invention relates to a non-helical, multiple compound element, true torsion system, for connection between a drive and a load.
2. Description of the Related Art
Non-helical true torsion springs or rods are limited in their rotational range, load capacity and efficiency by the rapid increase of internal molecular stresses within the torsion elements. Internal stresses increase exponentially at the doubling of the elements' radius or its rotation in degrees, causing rapid loss of efficiency, resistance to further rotation and deformation or failure of the element. Rotationally used helical or coiled springs, commonly mislabeled as torsion devices, increase their usable rotation range by having very long, small diameter coiled elements, like garage door springs. The difficult-to-use configuration or shape requires the elements be used in the much less efficient tension-compression or non-torsion mode and sacrifice load capacity, ease of use and efficiency.
U.S. Pat. No. 6,877,728 discloses a suspension assembly having multiple torsion members which are not twisted in torsion. Elastomeric material between first and second revolving members is distorted by rotation of one member within the other.
U.S. Pat. No. 5,161,818 teaches a lateral compound torsion suspension device using return bars, which are not complementary but instead exert forces or torsion in opposite vectors. The device is folded in layout only and the capacities of the torsion elements are not added. There are separate connections of the load carrying torsion and anti-sway torsion regulating systems.
U.S. Pat. No. 6,752,411 shows a two-piece, rigid axle having two elements which are elastomeric and not in torsion. A unit rotates but there is no twisting or torsion. Resistance or energy absorption is accomplished through elastomeric squeezing.
U.S. Pat. No. 5,277,450 discloses a torsion axle in which a primary torsion axle 48 operates in simple torsion and a load level is adjusted by controlling the compressibility of elastomeric rods. Rather than providing a multistage device using two torsion units, one torsion unit and one elastomeric adjustable base or reference unit are provided. They are not compound torsion devices.
U.S. Pat. No. 5,178,406 teaches a torsion bar system which does not carry a vehicle load, but instead torsion is used for sway control. As the vehicle attempts to sway and roll, the bar picks up an inside wheel.
U.S. Pat. No. 5,163,701 shows a torsion spring vehicle suspension having a torsion cartridge inserted inside an axle and a load carried through a torque hub and shaft. Only the torsion cartridge and not the axle is in torsion. The device is non-adjustable and is limited in rotation and not compound in nature.
U.S. Pat. No. 6,241,224 discloses a torsion spring in which first and second members absorb rotational forces, not by torsion of an element but by elastomeric compression of rubber-like material therebetween.
It is accordingly an object of the invention to provide a non-helical, multiple compound element, true torsion system, which overcomes the hereinafore-mentioned disadvantages of the heretofore-known devices of this general type and which provides true torsion, that is a twisting of the molecular structure, not just the act of rotation. True torsion or molecular level twisting of the spring element is much more efficient at absorbing and releasing energy or springing because pure torsion has none of the focused molecular compression as in bending or flexing objects. True torsion spreads tension evenly along the entire element. Multiple compound elements, both load sharing and rotation sharing, create a new class of torsion devices with superior dynamic springing qualities.
With the foregoing and other objects in view there is provided, in accordance with the invention, a non-helical, multiple compound element, true torsion system, comprising a working element to be connected to a load, a non-working, adjustable control element and a drive for driving the control element relative to a fixed base of the drive. At least one or a multiplicity of S-shaped compound torsion elements have ends each being connected to a respective one of the working and control elements. The S-shaped compound torsion element or elements provide the true torsion or twisting of the molecular structure, which is not just rotation. The torsion system, elements and separate parts are manufactured of composite material, metal or other suitable material.
In accordance with another feature of the invention, the at least one S-shaped compound torsion element includes two terminal sections each being connected to a respective one of the working and control elements and an intermediate section connected between the terminal sections, for a total of three sections. However, the torsion system can further include two additional sections each being connected between a respective one of the terminal sections and a respective one of the working and control elements, for a total of five sections. Of course, any number of sections greater than five can also be provided, according to the particular application. Additional compound or folded elements may be added and “connected in series” to increase the rotation capacity by “multi-element serial rotation sharing”. Additional compound or folded elements may also be added and “connected in parallel” to increase load capacity by “multi-element parallel load sharing”. Multiple smaller radius, stress-resistant torsion elements are used in the torsion system instead of larger radius, stress-prone elements to reduce radius induced stresses and increase efficiency.
In accordance with a further feature of the invention, the at least one S-shaped compound torsion element is folded between the sections, or fitments may be used to interconnect the sections. The folds or fitments each provide the necessary connection between the sections. The rotational range of the torsion system (in degrees) may be controlled by the element lengths, torsion characteristics and number of folds or compounding of the formed torsion elements. The load capacity may be statically controlled by the strength, torsion characteristics and number of parallel oriented torsion elements employed.
Therefore, one or more folded elements form compounded torsion elements having at least two termination ends and one or more intermediate ends. The intermediate ends are formed or affixed together by various techniques, causing a reversal of the element structure to create the folded or compounded element. The intermediate ends are locked in torsion to the preceding and succeeding elements to achieve a multi-element continuity of equal torsion sharing between the connected elements. The body of the torsion elements may be bowed or curved for improved clearance or formed of non-parallel wall elements for improved function. The completed torsion elements have a terminal end secured as a fixed, but optionally adjustable attachment to the device or parent structure and the opposing terminal end secured at a moveable working attachment like an arm, lever, pulley or gear. The intermediate element ends, which are not attached to the body of the spring device, have a circular freedom allowing the intermediate ends to rotate in a plane around the axle or axis in shared rotation. Each element's rotational capacity is added to the advancing intermediate points of the next or preceding element. This serial combining or rotation sharing adds the rotation of each element to the moving intermediate points and dramatically increases the total rotation of the elements as a system.
The true torsion spring system according to the invention simultaneously increases load and rotational capacity while still retaining the high efficiency of pure torsion. This compound torsion system reduces internal element radius stress by using multiple, small radius, individually controllable, multi-centric elements placed around a pivoting center or axle for increased “loading in parallel.” The system increases rotational capacity by using serially connected, folded or compounded elements having a cooperative rotation sharing for efficient “rotation in series.”
In accordance with an added feature of the invention, collars each connect a respective one of the terminal sections to a respective one of the working and control elements. At least one of the collars is selectively releasable, permitting rotation of at least one of the terminal sections relative to one of the working and control elements. Others of the collars fix the terminal sections against rotation relative to the working and control elements. The load capacity may additionally be dynamically controlled by the number of torsion elements engaged in the device, such as by their engagement collars, at any one time. The element engagement collars may be engaged or released manually or electrically whether the device is without spring load or in torsion. The working end attachment points' rotational position and preload may be controlled statically or dynamically, by the rotational adjustability of the fixed end attachment.
The attachment of the element terminal ends to the device endplates allows lengthwise and angulation movements of all elements and may be optionally set to lock or free rotation movement between each individual element and its attachment point to augment function and control torsion loading. The device's attached or non-working endplate may be adjusted or turned in rotation to adjust, increase or decrease torsion on the element group.
In accordance with an additional feature of the invention, the control element is a gearwheel, and the drive is a motor having a shaft with teeth meshing with the gearwheel. An axle passes through the working and control elements to the mounting stands. A working wheel or arm is connected to the axle in the vicinity of the working element.
In accordance with yet another feature of the invention, at least one servo device or motor engages and releases at least one of the collars. An electronic control device actuates the at least one servo device. At least one sensor may be connected to the electronic control device for sensing load variations to be used for actuating the at least one servo device. The electronic control device may have a program for actuating the at least one servo device. The electronic control device may be connected to the drive for driving the control element.
In accordance with a concomitant feature of the invention, the load is a vehicle suspension member and the control element is connected to a frame or chassis of a vehicle. Alternatively, the load is a door, such as a garage door, and the control element is connected to a building structure. Of course, the load may be any sprung device having a chassis and said control element may be connected to the chassis.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as embodied in a non-helical, multiple compound element, true torsion system, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
Referring now to the figures of the drawings in detail and first, particularly, to
The load connected to the working wheel or working arm 8 may be a vehicle suspension member and the control element 18 may be connected to a frame or chassis of a vehicle. The load connected to the working wheel or working arm 8 may also be a door, such as a garage door, and the control element 18 may be connected to a building structure. Individual torsion elements, which are identified generally by reference numeral 20, are connected between the working end plate 11 and the adjustable control end plate 18. The torsion elements 20 are connected to the working end plate 11 by element collars 21 and are connected to the adjustable end plate 18 by element attachment collars 22. The element attachment collars 22 have release buttons 23 which may be pushed-in for disengagement of the torsion elements 20 by sliding out from the adjustable end plate 18. Such release buttons could also be provided for the collars 21 as well.
The torsion elements 20, which may be formed of composite material, metal or any other suitable material, may be individually adjusted manually or with servomotors so as to be fixed or freely rotatable at the end plates 11, 18, as needed to provide the desired total torsion of all of the torsion elements 20 for a particular application. Accordingly, some torsion elements 20 may be fixed at both ends, some may be freely rotatable at both ends and some may be fixed at one end and rotatable at the other, all within one system.
The adjustment is carried out by activating the release buttons 23, as mentioned above. This may be effected manually or with servo devices or servomotors 24, only one of which is shown in
After adjusting the torsion elements 20 to be fixed or rotatable, the manual or servo driver 14 turns the shaft 15 which in turn turns the end plate 18 to apply the desired torsion to the torsion elements 20 and thus to the entire system at the control end 2. The torsion is delivered at the working end 4 to the end plate 11. Although the end plate 11 is shown as a wheel having an eccentric stub 9 for delivering the torsion, it may have an arm, a pulley or a gear, etc. instead, depending on the application, such as for a garage door or an automobile, etc.
It may be seen with the aid of
In contrast,