MOVABLE-WINDOW SAFETY DEVICE

Abstract: A movable-window safety device (12) for arresting upward movement of a power-driven window glass in a motor vehicle body in the event of obstruction in the window opening comprises a resilient channel (16) for receiving the window glass (52) and which is mounted in a rigid window frame (8). The base of the resilient channel comprises an electrical detecting number (30) housed in a hollow chamber (32). The side walls (17 and 18) of the resilient channel (16) extend proud of the sides of the rigid window frame (8) and carry curved-over outer lips (38, 40) and inner lips (20, 22). An obstruction in the window opening is carried upwardly by the window glass (52) and applies a force (F) to one or other of the side walls (17, 18) of the resilient channel (16), according to whether the obstruction extends inwardly or outwardly of the window opening. The resultant force (F) is applied to the detecting member (30). The detecting member (30) may be part of a capacitor in the tuned circuit of an oscillator whose frequency correspondingly varies in response to the resultant movement of the detecting member (30) and is detected to arrest the window glass. Instead, it could be a member whose electrical resistance is changed by the applied force (F) and is detected by an appropriate detecting circuit to arrest the window glass.

Description: MOVABLE-WINDOW SAFETY DEVICE The invention relates to a movable-window safety device for detecting the presence of an obstruction in an opening closable by power-driven window glass, comprising resilient material forming a resilient channel for mounting in a rigid window frame and for receiving an edge of the moving window glass when so mounted, force-responsive electrical detecting means mounted to extend along the frame whereby an obstruction in the window opening is caused by the moving window glass to apply a force to the detecting means so that the detecting means produces a corresponding electrical signal, and control means responsive to the electrical signal to arrest power-driven movement of the window glass. One such device is shown in EP-A-0 638 701. In this device, the electrical detecting means comprises electrical conductors mounted within a resilient enclosure running along the distal edge of one of the walls of the resilient channel, this resilient enclosure thus running along the rigid window frame at the mouth of the resilient channel. With such an arrangement, therefore, an obstruction entering into the window opening from the side of the window opening corresponding to the channel wall having the resilient enclosure produces an electrical signal. However, such an obstruction entering from the opposite side may not be moved into contact with the resilient enclosure by the obstruction and may therefore produce no force on the electrical detecting means and thus no signal to arrest the power-driven window glass. The invention aims to overcome this problem. Another similar form of such a device is known from EP-A-0 300 550 . Accordingly, the known device as first set forth above is characterised in that the electrical detecting means is mounted in the base of the resilient channel and in that the resilient channel is dimensioned so that its two side walls have extensions beyond the rigid window frame whereby an obstruction entering the window opening from either side thereof is moved into contact with a respective one of the extensions by the moving window glass and applies the said force through the extension to the detecting means. Movable-window safety devices embodying the invention will now be described, by way of example only, with reference to the accompanying diagrammatic drawings in which: Figure 1 is a perspective view of a motor vehicle showing where the safety devices can be mounted; Figure 2 is a cross-section on the line II-II of Figure 1, showing one of the safety devices mounted in position and in use; Figure 3 is a perspective cross-sectional view, corresponding to Figure 2, of one of the safety devices before completion of its manufacture; Figure 4 is a circuit diagram of one form of circuit which can be used in a system in which the safety devices may be used; Figure 5 corresponds to Figure 4 but shows a modified form of circuit diagram; and Figure 6 corresponds to Figure 2 but shows a modified form of the device thereof . Figure 1 shows a motor vehicle 5. Each door 6 carries a window frame 8 in which a window glass is upwardly and downwardly slidable, the window glass being raised and lowered by means of an electric motor mounted in the lower part of the door. For safety reasons, it is necessary to arrange for the upward movement of the window glass to be stopped automatically if an obstruction is detected in the window opening. Figure 2 shows a safety device embodying the invention which is used, in a manner to be explained, for stopping upward movement of the window glass in the event of detection of such an obstruction. The safety device 12 is in the form of a window guiding and sealing strip. The strip 12 comprises generally channel-shaped extruded plastics or rubber material 14 defining a channel 16 having walls 17 and 18. The strip 12 is mounted in the rigid window frame 8 mounted in the upper part of the door 6. The material 14 defines integral lips 20 and 22 which together bridge across the mouth of the channel 16. The base 24 of the channel is relatively thick and defines two longitudinally extending hollow chambers 26 and 28. In addition, a web 30 extends across the base of the channel and defines with it an enlarged chamber 32. The sides of the base 24 are integrally extended to provide lips 34 and 36. The distal ends of the walls 17,18 of the channel are provided with outwardly extending lips 38 and 40. The strip 12 is sized to fit within the U-shape of the window frame 8 and is arranged to be a resilient push-fit. When placed in position, its lips 34 and 36 expand outwardly behind shoulders formed where the edges of the inner and outer door panels 42 and 44 are bent over, and welded, to produce the window frame 8. In this way, the strip 12 is held firmly in position. The walls 17,18 of the strip 12 are sized so that their distal edges extend outwardly of the frame 8, the outer lips 38 and 40 curving over to engage over the edges of the window frame. In this way, gaps A and B are formed under the lips 38 and 40 for a purpose to be described. As shown in Figure 2, the lip 38 may clamp part of the interior trim 41 to the edge of the window frame. Inside the chamber 32, a detecting member 50 is positioned. The member 50 is inserted into the chamber 32 endwise during manufacture. The member 50 may take several different forms, as will be described in more detail below. In one form, it comprises an electrical conductor. In another form, it comprises material whose electrical resistance changes in response to applied force or pressure. The safety device or strip 12 is mounted along the upper part of the window frame 8 as shown in Figure 1 and may also extend down the "A" pillar of the vehicle. Along the "B" pillar of the vehicle, a normal window channel may be provided. Figure 2 shows the window glass 52. During normal unobstructed movement, it is raised by an electric motor under control of an occupant of the vehicle. As it completes its upward movement, it enters the channel 16, and, in so doing, is sealingly contacted on each side by the lips 20 and 22. Advantageously, these lips are covered with flock 54 or other suitable low friction material. If an obstruction is present within the window opening, however, such as a human hand, this will be carried upwardly by the rising window glass 52 and will make contact with the outer face C or D of the window channel, depending on whether the obstruction is presented from inside or outside of the vehicle (or may make contact with both faces C and D) . As the obstruction continues to be driven upwardly by the rising window glass 52, a force will be applied to the face C and/or the face D in the direction of the arrows F. This force will be transmitted to the detecting member 50 by the corresponding wall or walls 17,18 of the strip 12, this process being aided by the gaps A and B and by the chambers 26 and 28 in the base 24 of the strip which provide added compressibility for the base. In a manner to be described, the member 50 detects the presence of the obstruction and abruptly stops upward movement of the window glass. Advantageously, the upward movement of the window glass is not only stopped but reversed so that the obstruction can be removed. Figure 4 shows one form of circuit which may be used for driving the window glass 52 up and down and for responding to detection of an obstruction by the detecting member 50. In this case, it is assumed that the detecting member 50 comprises an electrical conductor. As shown in Figure 4, the circuit comprises a control unit 70 which is supplied with electrical power on lines 72 and 74 from the vehicle's battery 76. The control unit 70 includes an oscillator 78 having a tuned circuit, part of which is formed by a capacitor of which the detecting member 50 of Figure 2 forms one plate, the adjacent window frame 8 forming the other plate. A connection 80 (Figure 4) is therefore made from the oscillator to the detecting member 50. It will be understood that the extruded plastics or rubber material 14 electrically insulates the detecting member 50 from the vehicle bodywork. Figure 4 also shows the circuit for energising the electrical motor 84 for raising and lowering the window glass 52, this motor being positioned in the lower part of the door 6 (Figure 1) . The motor 84 is energised by means of an "up" switch 86 which is positioned for use by the driver or passenger. When switch 86 is closed, motor 84 is electrically energised through a further switch 88 forming part of the control unit 70. Switch 88 is normally closed. Closure of switch 86 therefore energises motor 84, and the window glass 52 thus begins to move upwardly. A second switch 90 is provided for the driver or passenger, and is used for causing the motor 84 to lower the window glass . In operation, the presence of an obstruction in the window opening causes a force F to be applied to one or both side walls 17,18 of the strip 12 in the manner explained. This results in corresponding movement of the detecting member 50. This causes a consequent and significant change in the capacitance in the tuned circuit of the oscillator 78. An abrupt and significant change in the oscillator frequency will therefore take place and this will be detected by a detecting unit 92 (Figure 4) in the control unit 70. Detecting unit 92 produces an output which opens switch 88, thus immediately stopping the motor 84 and the rising window glass 52. In addition, the control unit 70 may incorporate a reversing unit 96 which responds to the output from the detector 92 by providing an output on a line 98 which reverses the motor 84, so as to cause it to lower the window. A control 94 may be provided for adjusting the oscillator 78. When the window glass 52 rises in an unobstructed manner, it will of course eventually reach the base of the channel 16. The limit of its upward movement will be detected by a conventional limit switch (not shown) which will switch off the motor 84 in the normal way. In its final upward position, the window glass will apply pressure to the base of the channel, thus moving and/or applying pressure to the detecting member 50. However, the normal limit switch can be used to prevent the control unit 70 (Figure 4) from responding to such movement of or pressure on the detecting member 50. In another embodiment, detecting member 50 is not a simple electrical conductor but is instead made of material whose electrical resistance changes with applied force or pressure. Figure 5 shows a modified version of the circuit of Figure 4 which may be used when the detecting member 50 has this form. Items in Figure 5 corresponding to those in Figure 4 are similarly referenced. As shown, the circuit of Figure 5 incorporates a control unit 70A. This includes an output unit 100 which is energised by the battery 76 and applies an appropriate electrical potential across the member 50 (Figure 2) by output lines 102 and 104. A detecting unit 92A is connected to lines 102 and 104 and detects any change in electrical resistance of the member 50, caused by applied force (that is, by the force F resulting from the presence of any obstruction, as explained above in connection with Figure 2) . In the event of detection of such change in resistance, the detecting unit 92A opens switch 88 which thus abruptly stops motor 84 in the manner already explained. Again, the control unit 70A may be provided with a reversing unit 96. It will be appreciated that the circuits shown in Figures 4 and 5 are merely examples of many different forms of circuit which can be used for responding to the output of the detecting member 50. The arrangement of Figure 6 (in which parts corresponding to those in Figure 2 are similarly referenced) differs from that in Figure 2 in that the chambers 26,28 are provided on the opposite side of the member 50 as compared with Figure 2. In addition, member 50 is a closer fit in its enclosure 32 than in Figure 2. In both the arrangements (Figures 2 and 6) , different parts of the extruded plastics or rubber material 14 may be given different hardnesses to suit their respective purposes. The material of the base of the channel may be relatively soft, for example. The devices illustrated is advantageous in that it can detect an obstruction which enters the window opening either from the inside or the outside of the vehicle.

Claims: CLAIMS 1. A movable-window safety device for detecting the presence of an obstruction in an opening closable by power-driven window glass (52) , comprising resilient material (14) forming a resilient channel ' (16) for mounting in a rigid window frame (8) and for receiving an edge of the moving window glass (52) when so mounted, electrical detecting means (50) mounted to extend along the frame (8) whereby an obstruction in the window opening is caused by the moving window glass (52) to apply a force to the detecting means (50) so that the detecting means (50) produces a corresponding electrical signal, and control means responsive to the electrical signal to arrest power-driven movement of the window glass (52) , characterised in that the electrical detecting means (50) is mounted in the base of the resilient channel (16) and in that the resilient channel (16) is dimensioned so that its two side walls have extensions (17,18) beyond the rigid window frame (8) whereby an obstruction entering the window opening from either side thereof is moved into contact with a respective one of the extensions (17,18) by the moving window glass (52) and applies the said force through the extension (17,18) to the detecting means (50) . 2. A device according to claim 1, characterised in that the electrical detecting means (50) is mounted within a resilient enclosure (32) in the base of the resilient channel (16) . 3. A device according to claim 1 or 2, characterised in that each extension is formed by the edge of the respective one of the walls (17,18) of the resilient channel (16) . 4. A device according to claim 3, characterised in that each distal edge carries an integral lip (38,40) extending away from the mouth of the channel (16) and for partially embracing an adjacent part of the window frame (8) . 5. A device according to claim 4, characterised in that each distal edge carries an integral lip (20,22) for making sealing contact with an edge of the window glass (52) . 6. A device according to any preceding claim, characterised in that the resilient material forming the base of the channel (16) is provided with at least one hollow chamber (26,28) to increase its resilience. 7. A device according to claim 6, characterised in that the hollow chamber (26,28) is closer to the outside of the base of the channel (16) than the electrical detecting means (50) . 8. A device according to claim 6, characterised in that the hollow chamber (26,28) is closer to the inside of the base of the channel (16) than the electrical detecting means (50) . 9. A device according to any preceding claim, characterised in that the base of the channel (16) is formed with integral lips (34,36) extending externally of the channel and outwardly from the base thereof to make locking contact with respective formations (42,44) on the rigid frame (8) . 10. A device according to any preceding claim, characterised in that the control means comprises an electrical oscillating circuit (78) having a tuned circuit for determining the frequency of the oscillator (78) , and in that the detecting means (50) comprises an electrical conductor (50) the movement of which in response to the said force affects capacitance within the tuned circuit and thus the frequency of the oscillator (78) , the control means including means (92) responsive to variation in the frequency of the oscillator (78) to produce a controlled output, and means (88,96) responsive to the controlled output for arresting the movement of the power-driven window (52) . 11. A device according to any one of claims 1 to 9, characterised in that the detecting means (50) comprises material the electrical resistance of which varies in response to the said force, and in that the control means comprises means (92A) connected to the detecting means (50) for detecting the said variation in its electrical resistance and for producing a controlled output, and means (88,96) responsive to the controlled output for arresting the power-driven window (52) . 12. A device according to claim 10 or 11, characterised by means (96) responsive to.the controlled output for reversing the power- driven window glass (52) so as to drive it away from the resilient channel (16) .

Inventors: BRODOWSKY THOMAS, BRODOWSKY, THOMAS
Applicants: BRODOWSKY THOMAS, DRAFTEX IND LTD, BRODOWSKY, THOMAS, DRAFTEX INDUSTRIES LIMITED
Application year: 1996
Main classification: E05F15
IPC codes: B60J10, E05F15