Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1988-10-24
1992-10-06
Skaggs, H. Grant
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
187 1R, B66B 1104
Patent
active
051523752
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a lifting means for laboratory apparatus with stand profile and base pedestal and with a supporting element to be raised and lowered which is movable along a stand, which supporting element is provided with means for holding it fast and with actuating means for moving said supporting element, as well as a laboratory heating bath, especially for rotary evaporators.
In the case of rotary evaporators, rapid lifting devices serve to accommodate glass fittings for the evaporation and condensation of substances, to lift heating baths, mixers, laboratory stirrers, and the like.
In most cases, it is necessary that raising and lowering be performed rapidly, without effort, safely, i.e. without tilting or lifting the lifting device itself, and above all with one hand. With regard to operation, ergonomics and safety, stringent requirements are imposed on such lifting means, above all when they are to be used in a versatile fashion. Today many processes or operations in the laboratory are controlled and monitored by microelectronics. The lifting means must also be capable of being included in this process. For these reasons, a versatile and modern lifting means must fully satisfy the safety requirements and regulations, from simple to process-controlled applications.
Such a versatile lifting means, which satisfies the requirements for rotary evaporators and as a general laboratory lifting means and is simultaneously designed for manual operation and as motor drive, is not known up to the present.
There has, however, become known a height-adjustable stand, especially for rotary evaporators, with a base pedestal and with a holding device slidable along a roughly vertical stand rod and fixable on said stand rod by means of a catch. This device, with regard to its function in the supporting element, serves for the mounting of glass apparatus and of a drive unit or the like. The holding device is so connected to a mechanical means of energy storage that when the catch is released said holding device can be lowered against the force of the energy-storage means or raised with the support of the force of the energy-storage means. With this construction, a spring is used as means of energy storage, which spring, in principle, can be both mechanical as well as pneumatic.
For the purpose of energy reduction in this height-adjustable stand, there is a mechanical means of energy storage in the form of a torsion spring arranged in a cable drum which is connected to the holding device by exposed tension means. By the installation of a geared motor with the energy-storage means, this system can also be operated by motor.
Because of the direct coupling of the holding device with the mechanical energy-storage means, i.e. without supplemental lever transmission, this embodiment is suitable only for relative small lifted weights (max. 8 kg). Very often, however, rotary evaporators also have glass attachments that are substantially heavier. In these cases, the operation of the stand is unpleasant, since there is then a danger of lifting or tilting the whole apparatus.
By virtue of the motor drive provided with this height-adjustable stand, the openly accessible tension means are driven by the mechanical force accumulator. The lifting system is therefore lowered only under its own weight. In other words, no compulsory force acts on the device during lowering. This is disadvantageous above all in case of severe contamination or with large weights to be shifted that act on the device. The so-called "stick-slip" effect then manifests itself, upon the occurrence of which the functional safety of the stand is no longer insured. (European Patent Application 0149972)
The prior art further includes a device for holding *vacuum evaporators at a variable height above a baseplate. In this device, in order to provide for the stable, automatic holding of the vacuum evaporator at variable height, said vacuum evaporator is supported by a swing lever connected indirectly or directly to the baseplate. This lever is electrom
REFERENCES:
patent: 3957137 (1976-05-01), Vermette
patent: 4222461 (1980-09-01), Gunti
Noland Kenneth
Skaggs H. Grant
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