Measuring and testing – Rotor unbalance – Tool and adjunct
Patent
1996-11-12
1998-10-13
Williams, Hezron E.
Measuring and testing
Rotor unbalance
Tool and adjunct
254 93R, G01M 100, B66F 324
Patent
active
058214160
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for temporary supporting of objects in a height adjustable, "weightless" manner, and the invention aims particularly at such devices, which should be usable for carrying objects of different weights. The invention first of all relates to a weightless carrying of car wheels by the mounting of these on the spindle of a wheel balancing machine, where it is important that the wheels be fixed while the weight of the wheel is outbalanced.
This kind of supporting is relatively easily achievable by the use of a working cylinder containing or being connected with a large air volume in a closed space, such that an air cushion can be built up beneath the cylinder piston and, when the air pressure is suitably adjusted, thereby carry an object of a specific weight placed on a carrier platform connected with an upright piston rod of the cylinder. Due to the large air volume the relevant sufficient air pressure will not change essentially if the piston is displaced somewhat up- or downwardly, and for that reason it is possible, by a light touch of the object, to adjust the height position thereof between different self-carried positions within a certain height range, e.g. of 10-30 cm.
Often it will be actual to pick up an object from the floor level and deliver it at almost the same level, and since it will be unpractical to relieve the pressure of the entire system for each change of objects it is preferred to effect the lowering by the aid of pressing means for a compulsory pressing down of the movable system and holding it down even after removal of the heavy object. When a new object with the same or almost the same weight is thereafter placed on the carrier platform, the latter will automatically return up to the weightless area when the pressing means are released. Correspondingly, objects may be received from and delivered to a higher level by way of a compulsory raising to that level and a temporary blocking therein.
If the new object has another weight it will be necessary to change the air pressure correspondingly until the object rises or descends to the relevant level. However, it has been found that this may imply certain difficulties of operation, so it is desirable to provide for an automatic control of the pressure, according to the requirements. There are different straight solutions to this end, but they tend to be complicated, and the invention aims at providing a particularly simple and suitable arrangement.
BRIEF DESCRIPTION OF THE DRAWING
The principles thereof will be apparent from the following description with reference to the drawing, in which:
FIG. 1 is a perspective front view of an example of a supporting device according to the invention;
FIG. 2 is a schematic view seen from the rear, and
FIG. 3 is a plan view showing the control components used.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The device shown in FIG. 1 has a base portion 2 having at its rear an upright guiding box portion 4 provided with a rail system for vertical guiding of a frame member 6, which, itself, has transverse guiding means for a horizontal guiding of a projecting carrier member 8 with an outer carrier plate 10. The latter is mounted on an arm 12 which can be introduced into one of several holding openings 14 in the unit 8 for adjusting the working level of the plate 10 in its elevated condition. The job here considered by way of example is to bring a car wheel placed on the plate 10 up to a mounting level next to a spindle 16 of a balancing machine and to thereafter, by lateral displacement of the unit 8, bring the wheel into its mounting position on the head of the spindle. After the mounting, the plate 10 is to be lowered for liberating the wheel, and after the balancing operation the plate 10 should be raised again for receiving the wheel and bringing the wheel out from the spindle for a subsequent lowering of the wheel.
As shown schematically in FIG. 2 the guiding frame member 6 is mounted on a lift frame 18 which, inside the housing 4, su
REFERENCES:
patent: 3935748 (1976-02-01), Lannen
patent: 4021018 (1977-05-01), Dasan
patent: 4763515 (1988-08-01), Pielach et al.
patent: 4979723 (1990-12-01), Wittersheim
Moller Richard A.
Safran David S.
Williams Hezron E.
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