1986-10-01
1988-05-17
Joyce, Harold
98 209, 98 211, B60S 154, B60H 306
Patent
active
047442891
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a National Phase application corresponding to PCT/EP86/00050 filed Feb. 5, 1986 and based under the International Convention upon German National applications P 35 03 780.6 of Feb. 5, 1985 and P 35 04 155.2 and 35 04 156.0, both filed Feb. 7, 1985.
FIELD OF THE INVENTION
The invention relates to a cab for occupancy by individuals, e.g. for a motor vehicle, which is equipped with an aeration and air removal system with integral blower as well as a filtering arrangement.
BACKGROUND OF THE INVENTION
It is known to protect working cabs or the cabs of motor vehicles against external influences with dust filters or also chemical absorption filters so that the occupants of the cabs are not troubled by the noxious substances present in the air brought in for ventilating purposes. The filters of this type are fabric filters or activated charcoal.
The known aeration and air removal system of the abovementioned type are disadvantageous in that, in a comparatively short time they are clogged by pollutants and in that the window areas of such cabs are easily covered by condensation.
OBJECT OF THE INVENTION
The object of the invention is to provide a cab of the abovementioned type such that, the abovementioned disadvantage is avoided and an unobjectionable aeration and air removal with ambient air freed of noxious substances is assured over a period of considerable duration and such that window areas are kept free from condensation.
SUMMARY OF THE INVENTION
In the sense of the invention, this is accomplished in that the filtering arrangement consists of two filter packages, which are arranged in a V, and in whose entrance opening a ventilator is provided, whereby a sensor is provided on the interior of the cab window, and generates a control pulse upon appearance of humidity on the interior surface of the window.
The V-shaped arrangement of the filter packages with respect to each other results in their being saturated uniformly, so that one-sided clogging and resultant premature obstruction of the filter packages is excluded. The sensor measures the moisture condensing on the inside of the window and generates a control pulse for the operation of levers or controls when a certain predetermined value is exceeded.
Advantageously, the filter packages have a chemical absorption arrangement in three layers, where the first layer consists preferably of soda lime, the second of fluffed-up calcium aluminum silcate which is saturated with substances oxidizable with H.sub.2 S, and the third layer of activated charcoal.
The chemical absorption layers can be provided in a different sequence, depending on whether they are intended for use in rural and/or urban environments, e.g. when H.sub.2 S loading dominates, provided with a layer of activated charcoal as the first layer exposed, and/or a mixture of the chemical absorption substances can be provided as a compact filter fill.
For an aeration and air removal system with air conditioning it is advantageous to control the latter not only, as has been usual up to now, depending on outside temperature, but also based on the condensation state of the window panes. For this purpose, a sensor is placed preferrably on the inside of the front pane, so that the latter is freed of the humidity upon appearance of condensation by the start-up of the air conditioning.
Upon response of the sensor the blower of the ventilating system is switched on via the air conditioning machinery and the air nozzles which keep the panes clear receive air, so that the time necessary to free the panes of condensation is shortened further.
In accordance with a further characteristic of the invention, the sensor has an electrically non-conducting carrier foil into which electrically conducting wires are emplaced, the free ends of the wires facing one another being angled out to protrude from an interior surface of the carrier foil, while the other ends are connected to an electrical circuit for measurement of resistance. The electrically cond
REFERENCES:
patent: 2675094 (1954-04-01), Young
patent: 3870495 (1975-03-01), Dixson et al.
patent: 4492151 (1985-01-01), Mattei
Dewert Heribert
Gresch Heinrich
Holter Heinz
Igelbuscher Heinrich
Tischendorf Joachim
Dubno Herbert
Holter Heinz
Joyce Harold
Ross Karl F.
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