Abstract: A filter for a vehicle air conditioning apparatus is composed of only a filter medium, and is disposed in a case. A first support member supports a peripheral portion of the filter and a second support member supports a central portion of the filter in the case to prevent deformation of the filter. The filter composed of only the filter medium can be bent, and be detached from the case in a narrow space. It is not necessary to detach opposing parts such as a glove compartment to detach the filter.

Abstract: In an inside/outside air switching device, a seal member is provided at a position around a rotation center axial line of a rotary door, for sealing an inside/outside air switching box in an axial direction. The rotary door is disposed to be elastically deformable in such a manner that at least both parts of side wall plates of the rotary door around the rotation center axial line are displaced away from each other by a dynamical pressure of a vehicle travelling, applied to an outer wall plate of the rotary door, in an inside air mode. The seal member press-contacts the inside/outside air switching box when at least both the parts of the side wall plates around the rotation center axial line are displaced away from each other.

Abstract: An inside/outside air switching box has first and second inside air introduction ports, and an outside air introduction port. An inside/outside air switching door is disposed to open and close the first inside air introduction port and the outside air introduction port, and the second inside air introduction port is opened and closed by an inside air auxiliary door operated due to a pressure difference generated by operation of a blower fan between an inner side of the inside/outside air switching box and an inner side of a passenger compartment. Accordingly, even in an outside air introduction mode, inside air can be introduced from the second inside air introduction port.

Abstract: In an air conditioner, filter deformation strings are disposed on an outer surface side of a bent portion of a filter, so that the bent portion of the filter is crushed when a predetermined tension is applied to the strings. When the strings are drawn, the bent portion of the filter is deformed to a plate like, and the filter can be readily removed from a casing through a filter-removable port of the casing. On the other hand, when the filter is attached into the casing, the deformed plate-like filter is inserted into the casing from the filter-removable port while drawing the strings, and thereafter, the strings are loosened so that the shape of the filter returns to an original shape.

Abstract: A sealing member 11 made of an elastic material secured to the outer peripheral edge of a door plate 10 is provided with support portions 11a and 11b that extend in a direction to intersect the door plate 10, and the support portions 11a and 11b are directly supported by the outer peripheral edge of the door plate 10. Sealing portions 11c and 11d pressed onto a sealing surface 12a of an air passage casing 12 are so formed as to be directed toward the central portion of the door from the support portions 11a and 11b, and the sealing member 11 is folded, in cross-section, from the outer peripheral edge of the door plate 10 toward the central portion of the door due to the support portions 11a and 11b and the sealing portions 11c and 11d.

Abstract: An air conditioning apparatus for a vehicle includes a front air-conditioning unit for adjusting a temperature of air blown toward a front seat side in a passenger compartment, and a rear air-conditioning unit for adjusting a temperature of air blown toward a rear seat side in the passenger compartment. In the front air-conditioning unit, a ratio between an amount of air passing through a front heater core and an amount of air bypassing the front heater core is adjusted by an air mixing door, and the temperature of air blown toward the front seat side in the passenger compartment is adjusted by the rotation of the air mixing door. On the other hand, in the rear air-conditioning unit, a flow control valve for controlling a flow rate of hot water flowing into a rear heater core is provided, and the temperature of air blown toward the rear seat side in the passenger compartment is adjusted by the flow control valve.

Abstract: In a blower unit for a vehicle air conditioner, an inside/outside air switching door opens an inside air introduction port and closes an outside air introduction port when an inside air introduction mode is set. Plural ribs for irregularly reflecting an air-blowing noise generated by a blower fan are provided on an inner surface of the inside/outside air switching door, and top ends of the ribs are arranged along a main flow of inside air introduced from the inside air introduction port during the inside air introduction mode. Thus, the blower unit effectively reduces a reflected noise on the inner surface of the inside/outside air switching door, and effectively prevents a disturbance noise of the main flow of inside air.

Abstract: A vehicle ventilation system mounted to the upper portion of the exterior structure of a vehicle's occupant cabin. The components of the exterior structure of the occupant cabin define an opening through the exterior structure of the occupant cabin in the upper portion of the occupant cabin. A duct is mounted to the exterior structure of the occupant cabin and has a first end in fluid communication with the opening in the exterior structure of the occupant cabin. A second end of the duct is positioned below the first end of the duct and is open to and in fluid communication with the outside atmosphere. A fan is mounted to the exterior structure of the occupant cabin and is positioned such that when in operation it can be operated to move air through the opening in the exterior structure of the occupant cabin. The fan is controllable to change the rate and direction of the flow of air which it creates.

Abstract: A reduced noise automotive ventilation system uses two blowers, a front mounted blower that pulls outside air in, and a rear mounted fan that exhausts interior air from the cabin space. By pulling and pushing in series, the speed of each blower is reduced, and the attendant blower noise is considerably reduced. In addition, a closed floor duct routes recirculated air from the rear to the front blower, eliminating the conventional open blower noise path to the vehicle interior in recirculation mode.

Abstract: An inside/outside air switching box has first and second inside air introduction ports, and an outside air introduction port. An inside/outside air switching door is disposed to open and close the first inside air introduction port and the outside air introduction port, and the second inside air introduction port is opened and closed by an inside air auxiliary door operated due to a pressure difference generated by operation of a blower fan between an inner side of the inside/outside air switching box and an inner side of a passenger compartment. Accordingly, even in an outside air introduction mode, inside air can be introduced from the second inside air introduction port.

Abstract: In an air conditioner, filter deformation strings are disposed on an outer surface side of a bent portion of a filter, so that the bent portion of the filter is crushed when a predetermined tension is applied to the strings. When the strings are drawn, the bent portion of the filter is deformed to a plate like, and the filter can be readily removed from a casing through a filter-removable port of the casing. On the other hand, when the filter is attached into the casing, the deformed plate-like filter is inserted into the casing from the filter-removable port while drawing the strings, and thereafter, the strings are loosened so that the shape of the filter returns to an original shape.

Abstract: In an inside/outside air switching device, a seal member is provided at a position around a rotation center axial line of a rotary door, for sealing an inside/outside air switching box in an axial direction. The rotary door is disposed to be elastically deformable in such a manner that at least both parts of side wall plates of the rotary door around the rotation center axial line are displaced away from each other by a dynamical pressure of a vehicle travelling, applied to an outer wall plate of the rotary door, in an inside air mode. The seal member press-contacts the inside/outside air switching box when at least both the parts of the side wall plates around the rotation center axial line are displaced away from each other.

Abstract: The invention relates to an air flap for a ventilation, heating or air conditioning system of a motor vehicle. The flap has a shut-off surface extending between two outer edges, each having a curved or vaulted profile. End sections of the first edge adjoin the end sections of the second edge, and the end sections are joined to a pivot axis. In order, in particular, to obtain a compact construction for the air conditioning system, the air flap preferably has a shape in which a first area (A) enclosed by the first, outer edge and the pivot axis is larger than a second area (B) enclosed by the second, outer edge and the pivot axis. An air flap of this type is used, in particular, as a fresh-air/circulating-air flap.

Abstract: A sealing member 11 made of an elastic material secured to the outer peripheral edge of a door plate 10 is provided with support portions 11a and 11b that extend in a direction to intersect the door plate 10, and the support portions 11a and 11b are directly supported by the outer peripheral edge of the door plate 10. Sealing portions 11c and 11d pressed onto a sealing surface 12a of an air passage casing 12 are so formed as to be directed toward the central portion of the door from the support portions 11a and 11b, and the sealing member 11 is folded, in cross-section, from the outer peripheral edge of the door plate 10 toward the central portion of the door due to the support portions 11a and 11b and the sealing portions 11c and 11d.

Abstract: A climate control unit (4) for excavators (2), comprises a fan (6) arranged in a first opening (8) in an operator cab wall (10) of the excavator (2), at least one main filter (24) arranged to cover the first opening (8) and a first cover (26) arranged over the main filter (24) and the first opening (8). The first cover (26) has a first inlet opening (28) in which a prefilter (30) is arranged.

Abstract: A blower unit includes a case divided into an upper case portion having an air introduction port, a lower case portion for accommodating a fan, and a bell-mouth portion interposed between the upper and lower case portion portions. An air leading port is provided in the bell-mouth portion, so that air sucked from the air introduction port is introduced to the fan through the air leading port. An attachment boss portion onto which a motor is attached is formed to protrude from an outer wall surface of the upper case portion. Air blown by the fan flows through a duct which is divided into a first member integrated with the bell mouth portion and a second member integrated with the lower case portion. The first member extends from the bell mouth portion obliquely to cover the attachment portion, and the second member extends from the lower case portion in the same direction as the first member to be engaged with the first member.

Abstract: A motor-vehicle heating and/or air-conditioning device has an air intake chamber (12) with an inlet (14) for outside air (AE), an inlet (16) for recirculated air (AR) and a flap (18) for selectively controlling the inlets. A motor-driven fan unit (28) downstream of the air intake chamber has a casing (30) accommodating a centrifugal turbine (34) driven by a motor (48). The fan unit takes in air flow axially then delivers it tangentially. The. combination formed by the outside-air inlet (14) and the recirculated-air inlet (16) extends on either side of an arbitrary plane (P) passing through the axis of rotation (50) of the motor (48), the latter being located on the same side as the air inlets (12) and (14), which makes it possible to reduce the axial space taken up.

Abstract: A blower unit includes a centrifugal fan, a fan casing forming a scroll-shaped air passage and accommodating the centrifugal fan, and a partition wall for partitioning an interior of the fan casing into first and second air passages in which different kinds of airs flow, respectively, in the axial direction. The partition wall is molded integrally to the fan casing so as to extend linearly from the inner wall surface of the fan casing toward a radial inside of the fan. The fan casing includes two divided cases having a divided face in the axial direction. In this way, the number of divided cases can be as well as the number of steps of assembling the fan casing can be reduced so that the work efficiency for assembling the fan casing is improved.

Abstract: An air conditioning apparatus for a vehicle includes a front air-conditioning unit for adjusting a temperature of air blown toward a front seat side in a passenger compartment, and a rear air-conditioning unit for adjusting a temperature of air blown toward a rear seat side in the passenger compartment. In the front air-conditioning unit, a ratio between an amount of air passing through a front heater core and an amount of air bypassing the front heater core is adjusted by an air mixing door, and the temperature of air blown toward the front seat side in the passenger compartment is adjusted by the rotation of the air mixing door. On the other hand, in the rear air-conditioning unit, a flow control valve for controlling a flow rate of hot water flowing into a rear heater core is provided, and the temperature of air blown toward the rear seat side in the passenger compartment is adjusted by the flow control valve.

Abstract: There is provided a blower unit for an air conditioning system for an automotive vehicle. A casing accommodates a blower. The casing is formed with a recirculating air intake port for introducing recirculating air and a fresh air intake port for introducing fresh air. A recirculating air intake door opens and closes the recirculating air intake port. A fresh air intake door opens and closes the fresh air intake port. A linkage links the recirculating air intake door and the fresh air intake door to each other, thereby interlocking the recirculating air intake door and the fresh air intake door to each other.

Abstract: An air inlet control device for a ventilating, heating and/or air conditioning system in a motor vehicle comprises a main valve pivotable about a first axis of rotation for selectively closing off a recirculated air inlet and a fresh air inlet, and a pressure adjusting valve, which is also movable pivotally so as to act on the dynamic pressure of the air at the fresh air inlet when the main valve is covering the recirculated air inlet. The pressure adjusting valve has an axis of rotation which is carried by the main valve and which is spaced away from the axis of rotation of the main valve.

Abstract: According to the present invention, a blower unit includes a centrifugal fan, a fan casing forming a scroll-shaped air passage and accommodating the centrifugal fan, and a partition wall for partitioning an interior of the fan casing into first and second air passages in which different kinds of airs flow, respectively, in the axial direction. The partition wall is molded integrally to the fan casing so as to extend linearly from the inner wall surface of the fan casing toward a radial inside of the fan. The fan casing includes two divided cases having a divided face in the axial direction. In this way, the number of divided cases can be as well as the number of steps of assembling the fan casing can be reduced so that the work efficiency for assembling the fan casing is improved.

Abstract: An air conditioning apparatus for a rear seat of a vehicle includes a centrifugal fan disposed at a downstream air side of an evaporator. The centrifugal fan is a backward curved fan having a plurality of blades each of which is curved backward relative to a rotation direction of the centrifugal fan. In the centrifugal fan, because a main component of velocity vector is in a radial direction of the centrifugal fan, a dynamical-pressure component of air blown from the centrifugal fan can be effectively changed to a hydrostatic-pressure component. Thus, during a cooler mode where air is simultaneously blown from first and second air outlets toward the rear space of the passenger compartment, a pressure of air blown from the first and second air outlets can be increased, and an amount of air blown toward the rear space of the passenger compartment can be sufficiently increased.

Abstract: A method and apparatus for ventilation of a vehicle interior which can be switched between an incoming air operating mode and a circulating air operating mode as a function of harmful substances. The incoming-air concentrations of several harmful gases are measured and are separately evaluated. In each case either an incoming air operation request or a circulating air operation request is generated. A circulating air operation adjustment command is generated if the analysis for at least one of the harmful gases results in a circulating air operation request. The incoming air operation the vehicle-interior concentration of each harmful gas is estimated continuously as a function of the pertaining measured incoming-air concentration and of an incoming air rate, and a circulating air operation adjusting command is generated if the estimated interior concentration of at least one harmful gas rises at a rate which exceeds a definable threshold value.

Abstract: An automotive air conditioning system designed to switch a ventilation mode to an air recirculation mode automatically when the contamination of outside air is greater than a given level. The system includes a mode selection prohibiting circuit that prohibits the switching between the air recirculation mode and the ventilation mode and operates the air conditioning system in the ventilation mode when the vehicle is traveling at high speeds or when the outside temperature is relatively low. This allows fresh air having a relatively lower humidity to be drawn into the passenger compartment, thereby avoiding fogging of inner surfaces of windows of the vehicle.

Abstract: A blower unit for an automobile air conditioner includes a centrifugal fan having a suction port for sucking outside air, and a motor for rotating the fan. The motor is disposed approximately horizontally to penetrate through the suction port of the fan. One end of the fan in an axial direction is connected to a rotation shaft of the motor by a connection member, and a water-prevention member is disposed on an outer peripheral surface of the motor at an inner peripheral side of the one end of the fan in the axial direction. The water-prevention member prevents water dropped onto the outer peripheral surface of the motor from moving to a side of the connection member. Further, the water-prevention member includes a groove portion for receiving water dropped from the one end of the fan along the connection member. Thus, in the blower unit, the water-prevention member prevents water from flowing into the motor.

Abstract: A device and method for controlling air conduction in a vehicle includes an air conduction element. The air conduction element is controlled as a function of the moisture in the vehicle interior, intermediate positions of the air conduction element being possible between a maximum proportion of circulating air and a maximum proportion of fresh air. In this way, the proportion of fresh air is increased only gradually when there is a high pollution impact if the interior moisture does not exceed a maximum moisture value .PHI..sub.max. Control of the moisture in the vehicle interior increases the comfort of the vehicle occupants. A circulating-air dryer makes it possible, in principle, to continue in circulating-air operation for an unlimited period.

Abstract: An air inlet assembly for the scroll housing of an automotive air conditioning and ventilation system is specially structurally matched to the scroll housing so as to be more compact and efficient. An inlet housing is fashioned coaxial to the scroll housing and blower, within which a coaxial, partially cylindrical door rotates around the central axis so as to open or close one of a pair of diametrically opposed air openings. An annular filter fits within the rotating door. Regardless of which air inlet is open, air that is pulled in by the blower is forced into a radial space between the filter and the door, three hundred and sixty degrees around, and is forced radially through the filter before entering the scroll housing. Because of the coaxial, matching relationship between inlet housing a scroll housing, the entire assembly is very compact and low in profile, as measured along the vertical co axis.

Abstract: A deodorizing filter for adsorbing malodorous particles in air is disposed at a downstream air side of a circumferential wall of an inside/outside air switching rotary door which opens and closes inside and outside air intake ports. A gap having a predetermined distance is provided between the deodorizing filter and the circumferential wall of the rotary door. The deodorizing filter is rotated integrally with the rotary door. When the rotary door is rotated to open both the outside and inside air intake ports at their intermediately opened positions, the inside air flowing from the inside air intake port directly flows into an outlet side of an inside/outside air switching box, and the outside air introduced from the outside air intake port passes through the gap and the deodorizing filter and flows into the outlet side of the inside/outside air switching box.

Abstract: A ventilating system for a vehicle cab includes a blower which draws fresh air from the exterior of the cab into the interior of the cab. A filter housing is inserted generally transverse to the direction of air flow through a service opening in the ventilating system into the channel through which the fresh air flows. The filter housing encloses a fresh air filter. The blower also draws recirculating air from the interior of the cab through a recirculating air intake opening and blows it back through a recirculating air filter into the cab through an outlet opening. The recirculating air filter is also mounted in the filter housing. A filter insert includes a filter housing which contains the fresh air filter and the recirculating air filter, which are adjacent each other on either side of a separating wall, fresh air and recirculating air are separately filtered.

Abstract: An inside air/outside air switching case employing a rotary door, since an introduced air flows along an inner surface of a circumferential wall of the rotary door, an air flow guiding portion constructed of a plurality of protruding portions formed in a corrugated shape of concavities and convexities is formed on an inner surface of the circumferential wall of the rotary door. In this way, the air flow directed toward a suction inlet is made uniform by means of the guiding portion, and the air flow noise can be suppressed.

Abstract: An air flow system for use in ambulance is generally comprised of a blower unit mounted in the ceiling of the ambulance's patient compartment, an air conditioning condenser, and a series of exhaust vents extending through the sidewalls of the patient compartment and positioned adjacent the floor. The exhaust vents each include a fan mounted therein for drawing the air in the patient compartment thereto and forcing the air out of the compartment. The blower unit includes louvers to permit selective air direction control, but essentially the blower unit always directs the conditioned air vertically downwardly over a patient supported on a stretcher, thereby creating an air curtain around the patient.

Abstract: An air conditioning system for vehicles prevents pressure loss in an air conditioner casing from increasing by air-conditioning a passenger compartment while detouring around an air cleaning unit when the air conditioning situation is in an irregular air conditioning range, and improves passengers' comfort by cleaning and air-conditioning air by way of the air cleaning unit when the air conditioning situation is in a regular air conditioning range.

Abstract: An air inlet for a heating or air-conditioning system is provided which includes a movable ram air flap for controlling inlet air flow as a function of relative vehicle speed and outside air speed and a circulating-air flap for controlling relative supply of fresh and recirculating air. The ram air flap and circulating air flap are arranged coaxially with respect to one another, supported in a common bearing in an intake housing. The air flaps are nested one radially inside the other, with the ram air flap having a smaller pivoting radius.

Abstract: A filter is disposed so as to cross at right angle to an airflow from an inside air inlet and an outside air inlet to an inlet port. The filter is made of a filter element formed in a corrugated shape by folding and is deformable so that a width of the filter in the axis direction of said rotary door could be shortened. Thus, it is possible to shorten the width of the filter in the axial direction of the rotary shaft by deforming the outer shape of the filter, therefore, the filter is easily taken out from the inside air inlet. Furthermore, since the filter can be taken out from the inside air inlet, the filter can be attached or detached without disassembling the inside and outside air switching case and casing for a blower fan, the working efficiency for cleaning and changing the filter being thereby improved.

Abstract: The invention is a flow control for a ventilation duct. It includes a movable panel which is attached to a variable volume reservoir. The application of vacuum to the reservoir controls the angular position of the door and the volume of the reservoir.

Abstract: A ventilation control door is integrated with a reservoir chamber. The air pressure within the reservoir chamber controls the position of the door to regulate ventilation. As the volume of the reservoir diminishes the door moves in a preferred direction. A restoring spring within the reservoir returns the door to a nominal position.

Abstract: A heating-ventilation and/or air conditioning apparatus for use in the passenger space of a motor vehicle. The components of the apparatus, disposed on the side of the passenger space in relation to a transverse partition separating this passenger space from the front engine compartment, comprise a heating device for producing warm air and having a heating impeller for sending this warm air into the passenger space and a ventilation device for producing the cool or conditioned air and having a ventilation impeller for sending this cool or conditioned air into the passenger space. The apparatus is applicable to motor vehicles having a very inclined windshield, especially for "single box" type vehicles.

Abstract: A method of reducing the level of air pollution in the interior of a vehicle having a controllable air intake system leading to the interior of the vehicle, and a detection system for detecting one or more conditions, comprising the steps of (a) detecting the one or more conditions, and (b) controlling air intake to the interior of the vehicle in response to such detection, so that the one or more conditions are causing and/or being the result of a potential energy to kinetic energy conversion of the vehicle and/of by the one or more conditions being the physical inclination of the vehicle. "Causing and/or being the result of" as used herein means "directly or indirectly causing and/or being the result of.

Abstract: A ventilation system for a car including an outside air channel, an interior air channel, and a radial fan having a suction side and an exhaust side. The fan is situated at junction between the outside air and interior air channels, so that the outside air and interior air channels are axially connected to the suction side of the fan. A partition wall is movable within an unrestricted cavity, so that the outside air and interior air channels are situated at different sides thereof.

Abstract: An apparatus for heating and ventilating, and/or air conditioning, the cabin of a motor vehicle, and in particular an electric vehicle, comprises a series of elements arranged in a generally horizontal succession along the longitudinal axis of the vehicle. These elements comprise: a blower for producing a stream of cold air; a first duct fed by the blower and divided into a cold air transmission branch and an air heating branch which contains a heat recuperator; a selection flap valve for controlling the distribution of the air flow between the two branches; a second duct which receives the outlet air of both of the two branches of the first duct, and which contains at least one electric radiant heater; and a distributor fed by the second duct and including a distribution valve for distributing the cold or heated air between appropriate ventilating ports in the cabin.

Abstract: A motor vehicle has a heating and ventilating system for the cabin of the vehicle, including an air treatment zone arranged in front of the cabin, with a recirculating air inlet which passes air from the cabin back to the treatment zone. The floor of the cabin has a double wall defining a recirculating air duct within it, the recirculation air inlet being at the rear end of this duct, so that air can be recirculated from the back of the cabin to the treatment zone in the form of a moving air mattress under the floor. This mattress improves the insulation of the feet of the occupants from the outside atmosphere.

Abstract: An installation for heating, ventilating and air conditioning the cabin of a motor vehicle of the kind in which the steeply inclined windshield forms in effect an upward and rearward extension of the motor hood, with the fascia panel being elongated longitudinally into the cabin of the vehicle, comprises a heating apparatus and a ventilating and air conditioning apparatus, both arranged in the central fascia panel. The ventilating and air conditioning apparatus has at least one upper air inlet port and at least one lower air inlet port, arranged in the fascia panel and directed upwardly and downwardly respectively. These ports are connected to the blower of the ventilating and air conditioning apparatus so as to supply the latter with recirculated air drawn from an upper zone and a lower zone, respectively, of the cabin.

Abstract: A vehicle ventilation system has a combined air inlet and filter assembly that combines the functions of selectively inletting fresh or recirculated air to the system, while filtering both, and also providing for easy filter change. An arch shaped inlet housing located upstream of the blower has two inlets lying on a cylindrical surface, one opening to the outside and one to the inside. A swingable cover moves over the outside of the inlet housing, blocking or opening one inlet at a time, but leaving the interior of the inlet housing unobstructed. A filter is fed through one of the inlet openings to take on the arch shape of the interior of the housing, covering both inlet openings so as to filter both inlet air selections. The filter may be easily removed and replaced.

Abstract: Air to be introduced into the cabin of a motor vehicle passes over a measuring device, in which parameters such as temperature, humidity and pollution are measured. The measuring device comprises a housing having an air inlet, which is supplied with a fraction of the air stream, and an air outlet for evacuating this fraction. The housing has an internal chamber which communicates with both the air inlet and the air outlet, and air circulating means such as a pump are provided for setting up a differential pressure between the inlet and outlet so that the fraction of the air stream to be measured flows through the chamber in the housing. The sensor or sensors are arranged in this chamber, so that they are always ventilated by the air passing through the latter.

Abstract: An electric vehicle has a traction motor and apparatus comprising an air circuit for cooling the traction motor, for providing heat, where required, for the cabin of the vehicle, and for ventilating the cabin. The air circuit of the apparatus comprises a main branch containing a main ventilating and heating blower, together with a secondary branch which is branched from the first branch and which contains the cooling radiator for the traction motor. An auxiliary blower is arranged in the secondary branch. An upstream mixing valve and a downstream mixing valve connect these two branches in parallel, in such a way that either: the flow of cabin heating air passes through the radiator; or the mixing valves isolate the secondary branch, so as to form an entirely separate cooling air circuit in which the air flow is produced by the auxiliary blower.

Abstract: The invention pertains to a locking mechanism consisting of a guide lever arm (1) and a sliding lever arm (5), in which one end of each of the lever arm pivots about a bearing (10, 11) at a certain distance from the other lever arm, in which the other end of the sliding lever arm (5).is slidingly coupled with a slot (4) in the other end of the guide lever arm (1) by a pin (7) connected with the sliding lever arm (5), and in which the lever arms can be swiveled into two end positions. A force (2) exerted on the guide lever arm (1) in one of the end positions for the purpose of swiveling the guide lever arm (1) into the other end position is compensated in a selflocking way in the slot (4) by a recess in the area of the other end of the guide lever arm (1), and this locking effect can be removed only by a force (6) exerted on the sliding lever arm (5) in the direction of the other end position.

Abstract: An arrangement for filtering the air entering the interior of a vehicle, particularly the interior of a car, includes a coarse filter, a fan unit and a fine-filtering unit. The whole of the arrangement is combined to form a unit which can be fitted to the vehicle in the manner of a conventional, openable roof hatch (b 2). When closed, the hatch has a rear part which projects above the roof of the vehicle and which includes an ambient air intake opening (3) in which the coarse filter is mounted. The hatch also includes a vehicle interior air intake opening (9), a shutter (11) for closing the ambient air intake opening and the interior air intake opening to a desired extent, and at least one outlet opening (8) through which filtered air is blown into the vehicle interior.

Abstract: In an air conditioner control device, edges of change of the sensor outputs are detected by the second derivative of the outputs of WO3 gas sensor for NOx detection. The edge represents that the sensor is exposed to diesel exhaust. Its response to diesel exhaust is quick and it does not affected much by the influence of the wind. When the edge is detected, an intake of an automobile ventilator is dosed and the inflow of contaminated outdoor air is interrupted. An AD convertor stored micro computer is used for processing the sensor signal. In order to compensate the shortage of resolution of the AD convertor, the outputs are first differentiated analogically, then amplified and converted to digital signals, and finally further differentiated digitally.

Abstract: The air circulatory system (32) utilizes a first and second air passageways (46) for communicating ambient air into the cab and an inlet (73) to introduce air that is circulating within the cab into the system through passageways (48,50,70,34) that create very little restriction for the air flowing therethrough. A pair of ducts (76) is utilized to discharge to air back into the cab (10) that also creates very little restriction for the air flow. This results in a very small drop in air pressure between the air being introduced into the blower assembly (40) and the air exiting the blower assembly (40). Subsequently, the requirements of the blower assembly (40) and the noise created by its operation kept at a minimum.