Patent Grant
8382168
1. Field of Invention
This invention relates to latch having magnets for use in securing one or more closure panels of a compartment in the closed position.
2. Brief Description of the Related Art
In many applications the need arises to secure a panel in a closed position relative to a compartment opening or another panel. For example, in the automotive industry the panels acting as closures for the interior compartments of the vehicle must be secured in the closed position when the compartment is not being accessed. Examples of such compartments include the vehicle's glove compartment and the center console compartment between a vehicle's front seats. The closure members for such compartments are selectively secured in the closed position by latches in order to secure the contents of the compartments while allowing a user to selectively open the closure members to access the contents of the compartments. Many latches for this purpose have been proposed in the art. Examples of such latches can be seen in U.S. Pat. Nos. 5,927,772 and 6,761,278. However, none of the known latches are seen to teach or suggest the novel and unique latch of the present invention.
The present invention is directed to a latch mechanism that is particularly advantageous for, but is not limited to, releasably securing dual doors of a compartment in the closed position. The latch has two rotary magnets, and each rotary magnet at least helps to secure a respective one of the doors in the closed position relative to the compartment by magnetically attracting a magnetic insert attached to the respective door. Mechanical hook-like rotary pawls provided to rotate with the magnets act to mechanically secure the doors in the closed position. The latch according to the present invention is particularly well suited for use in applications where the dual doors are linked. In such applications closing one of the doors also moves the other door to the closed position. However, the mechanical linkage between the doors is not perfect and the closing of the doors is not always simultaneous. Often one door will slightly lag behind the other door in closing. The latch of the present invention is designed to effect proper securing of the doors in the closed position even when one door lags behind the other. In addition, the latch is provided with a safety feature that prevents the latch from opening in the event that the vehicle in which the latch is installed is involved in a collision.
Like reference numerals indicate like elements throughout the several views.
The disclosures of U.S. Provisional Application for Patent Ser. No. 60/652,295, filed on Feb. 12, 2005, U.S. Provisional Application for Patent Ser. No. 60/666,694, filed on Mar. 29, 2005, U.S. Provisional Application for Patent Ser. No. 60/679,274, filed on May 8, 2005, and U.S. Provisional Application for Patent Ser. No. 60/683,981, filed on May 23, 2005, are incorporated herein by reference in their entirety. Also, the disclosure of International Application for Patent Serial Number PCT/US2006/17985, filed on May 8, 2006, and designating The United States of America, is incorporated herein by reference in its entirety.
Referring to
Referring to
The magnetic latch mechanism 300 also includes a pair of hook-shaped pawls 334, 336. Each hook-shaped pawl 334, 336 is supported by a respective magnet carrier 318, 319 such that the hook-shaped pawl 334, 336 and the respective magnet carrier 318, 319 rotate as a unit. Each hook-shaped pawl 334, 336 has a hooked head 322 with a cam surface 338 that faces away from the respective magnet carrier 318, 319 and a catch surface 344 that faces toward the respective magnet carrier 318, 319.
The magnetic latch mechanism 300 also includes magnetic inserts 314 and 316 that can be attached to the doors 302 and 304, respectively. Each of the magnetic inserts 314 and 316 corresponds to a respective one of the rotary magnets 306, 308. When the rotary magnets 306, 308 are in their latched positions and the doors 302 and 304 are in their closed positions, the pole of each of each of the rotary magnets 306, 308 facing the respective magnetic insert 314, 316 is of an opposite type (i.e. north, south) as compared to the pole of the magnetic insert 314, 316 facing its respective rotary magnet 306, 308. For example, the magnetic inserts 314, 316 may be positioned such that their south poles face their respective rotary magnet 306, 308 when the doors 302 and 304 are in their closed positions. In this case, the rotary magnets 306, 308 would be positioned in their carriers 318, 319 such that their north poles substantially face their respective magnetic inserts 314, 316 when the rotary magnets 306, 308 and their carriers are in their latched positions and the doors 302 and 304 are in their closed positions. Accordingly, an attractive force is exerted between each rotary magnet 306, 308 and its respective magnetic insert 314, 316 with the result that the doors 302, 304 to which the magnetic inserts 314, 316 are attached are held in the closed position.
Furthermore, the hook-shaped pawls 334, 336 engage respective strikers 324, 326 to mechanically block the movement of the doors 302, 304 from the closed position to the open position. This feature prevents the doors 302, 304 from being forcibly pried open from the exterior of the compartment being secured by the doors 302, 304.
The magnetic latch mechanism 300 includes the pair of strikers 324, 326 each of which corresponds to a respective one of the pair of hook-shaped pawls 334, 336. Each striker 324, 326 is supported by a respective door 302, 304 such that the striker is spaced apart from the respective door's interior surface and the head 322 of the hook-shaped pawl 334, 336 can fit between the respective striker 324, 326 and the respective door 302, 304. Each striker 324, 326 has a cam surface 328 that faces away from the respective door 302, 304 and a catch surface 330 that faces toward the respective door 302, 304. The cam surface 328 of each striker can interact with the cam surface 338 of the respective hook-shaped pawl 334, 336 to move the pawl out of the way of the striker 324, 326 and allow the respective door to move to the closed position if the respective hook-shaped pawl happens to be near the latched position, illustrated in
When the rotary magnets 306, 308 are in their unlatched positions (illustrated in
Again, for example, we can assume that the magnetic inserts 314, 316 are positioned such that their south poles face their respective rotary magnet 306, 308 when the doors 302 and 304 are in their closed positions. In this case, the north poles of the rotary magnets 306, 308 move away from the south poles of their respective magnetic inserts 314, 316 and the south poles of the rotary magnets 306, 308 move toward the south poles of their respective magnetic inserts 314, 316 as the rotary magnets 306, 308 and their carriers 318, 319 move from the latched position to the unlatched position, such that a net repulsive force is exerted between each rotary magnet 306, 308 and its respective magnetic insert 314, 316 when the rotary magnets 306, 308 reach their unlatched positions.
The opposite type pole of the respective rotary magnet 306, 308 need not directly face the pole of the magnetic insert 314, 316 facing its respective rotary magnet 306, 308 in the latched position. In the unlatched position, the rotary magnets 306, 308 may deviate from the direct facing relationship between the opposite type poles of the rotary magnets and of their respective magnetic inserts as long as the net attractive force between the rotary magnet 306, 308 and the respective magnetic insert 314, 316 is sufficiently strong to produce reliable simultaneous latching of the doors 302, 304 even when one door lags the other during closing as previously described. As long as this result is achieved, the poles of the rotary magnets 306, 308 having a polarity opposite the poles of the respective magnetic inserts 314, 316 facing toward the magnets 306, 308, can be said to be substantially facing the poles of the respective magnetic inserts 314, 316 facing toward the magnets 306, 308. Of course, the direct facing relationship between the opposite type poles of the rotary magnets and of their respective magnetic inserts gives the greatest holding power to the latch mechanism and it would be desirable for the north poles of the rotary magnets 306, 308 to approach the direct facing relationship with the south poles of their respective magnetic inserts as closely as possible in the latched position. The key consideration is that the angular position of the rotary magnets 306, 308 in the latched position must be selected such that the north poles of the rotary magnets 306, 308 are closer to the south poles of their respective magnetic inserts as compared to the south poles of the rotary magnets 306, 308 to such an extent that the net attractive force between the rotary magnets 306, 308 and their respective magnetic inserts is strong enough for the rotary magnets to draw in and hold the doors 302, 304 in the closed position as described herein. In the example being considered, the north poles of the rotary magnets 306, 308 deviate from the direct facing relationship with the south poles of their respective magnetic inserts by a few degrees in the latched position.
Each magnetic insert 314, 316 is attached to a respective one of the doors 302, 304 by being inserted in a magnetic insert housing 376, 378, respectively, which in turn are attached to a respective one of the doors 302, 304. In the illustrated example, the magnetic insert housings 376, 378 are attached to the doors 302, 304 by screws 380 whose heads are embedded in the material of the magnetic insert housings 376, 378. The screws 380 engage threaded holes in the doors 302, 304, such that turning the screws 380 adjusts the height of the magnetic insert housings 376, 378, and therefore the height of the strikers 324, 326, above the interior surfaces of the doors 302, 304.
The means for attaching the magnetic insert housings 376, 378 to the doors 302, 304 is not critical to the present invention and any suitable fastening means including screws, rivets, pins, nails and adhesives may be used. Furthermore, the magnetic insert housings 376, 378 may be of unitary construction with the doors 302, 304. The magnetic insert housings 376, 378 may also be dispensed with entirely and the magnetic inserts 314, 316 may be attached to the doors 302, 304 directly. As with the housings 376, 378, any suitable fastening means including screws, rivets, pins, nails and adhesives may be used to attach the magnetic inserts 314, 316 to the doors 302, 304. As yet another alternative, the magnetic inserts 314, 316 may be embedded in the material of the doors 302, 304.
However, it is preferred to use the illustrated means for attaching the magnetic insert housings 376, 378 to the doors 302, 304, because the illustrated means allows for the adjustment of the height of the strikers 324, 326 above the interior surfaces of the doors 302, 304 to accommodate variations in the gap between the doors 302, 304 in the closed position and the housing 332.
In the illustrated embodiment, the strikers 324, 326 are of unitary construction with the magnetic insert housings 376, 378, respectively. As with the housings 376, 378, the means for attaching the strikers 324, 326 to the doors 302, 304 are not critical to the present invention. Any suitable structure that supports the striker 324, 326 such that the striker is spaced apart a sufficient amount from the respective door's interior surface in order for the head 322 of the hook-shaped pawl 334, 336 to fit between the respective striker 324, 326 and the respective door 302, 304 may be employed and any suitable fastening means including screws, rivets, pins, nails and adhesives may be used to attach the structure to the respective door. Furthermore, the strikers 324, 326 may be of unitary construction with the doors 302, 304.
The magnetic latch mechanism 300 includes a housing 332 that rotationally supports the magnet carriers 318, 319 having the rotary magnets 306, 308, respectively, attached thereto. The top openings 305, 329 of the housing 332 allow the hook-shaped pawls 334, 336 to extend out of the housing 332 to engage the strikers 324, 326 in the latched position.
Each magnet carrier 318, 319 includes a receptacle 384, 386 for receiving the respective rotary magnet 306, 308. Each magnet carrier 318, 319 has a pair of spindles, 340, 342 and 350, 352, respectively, with each pair of spindles projecting outward on opposite sides of the respective receptacle 384, 386. The receptacles 384, 386, and consequently carriers 318, 319, are positioned in tandem along the longitudinal axis of the housing 332 with their axes of rotation being transverse, i.e. perpendicular, to the longitudinal axis of the housing 332. The spindles 340, 342, 350, 352 are received in and rotationally supported by the holes 354, 356, 358, 360 in the sides of the housing 332, respectively. Thus the magnet carriers 318, 319 are rotationally supported by the housing 332. In the illustrated example, the spindles 340, 342, 350, 352 are fluted. A cover 335 is provided for the circuit board 363. The holes 356, 360 are provided in a cover plate 333 that forms part of the housing 332. Again, the particular modality used for rotationally supporting the magnet carriers 318, 319 in the housing 332 is not critical to the present invention.
Each hook-shaped pawl 334, 336 is integrally formed with its respective magnet carrier 318, 319. Thus, there is no relative rotation between each receptacle 384, 386 and the respective hook-shaped pawl 334, 336; and each hook-shaped pawl 334, 336 and the respective receptacle 384, 386, and consequently the respective magnet carrier 318, 319, rotate as a unit.
Each magnet carrier 318, 319 also has a plurality of gear teeth 387 and 389, respectively. Each set of gear teeth 387, 389 is distributed along an arc defined by a sector of a circle centered at the axis of rotation of the respective magnet carrier 318, 319. The axis of rotation of each magnet carrier 318, 319 is of course defined by the central axis of the respective pair of spindles 340, 342 or 350, 352 of each magnet carrier 318, 319. The gear teeth 387, 389 of each magnet carrier 318, 319 are supported by, and are integral with, the respective receptacle 384, 386 of each magnet carrier. The first and second sets of gear teeth 313 and 337 of the rack bar 317 engage the gear teeth 387 and 389 of the magnet carriers 318 and 319, respectively.
The latch mechanism 300 includes a rack bar 317 that has first and second sets of gear teeth 313, 337 distributed along its length. Each set of gear teeth 313, 337 includes a plurality of gear teeth. The gear teeth 313, 337 are in constant mesh with the gear teeth 387, 389, respectively, such that the magnet carriers 318, 319 are linked by the rack bar 317. The rack bar 317 is supported for rectilinear motion back and forth in the direction of its longitudinal axis between a latched position, illustrated in
The sliding bar 315 has a depression 375 that registers with the opening 374 when the sliding bar 315 is in the unlocked position. The depression 375 allows the ball bearing 372 to retract into the rack bar 317 once the sliding bar 315 is in the unlocked position, which in turn frees the rack bar 317 for movement to the unlatched position.
The receptacle 369 has an opening at one end and a slot 311 extending down one side and partway through the bottom of the receptacle 369. The slot 311 extends along the length of the receptacle 369 from the open end of the receptacle 369 to the bottom of the receptacle 369 and along a portion of a diameter of the bottom of the receptacle. The slot 311 is wide enough to allow the Bowden cable 220 to extend through the slot 311. The cylindrical enlargement 209 may have any other shape and size such that it will not fit through the slot 311 but that it will fit into the receptacle 369.
The housing 332 has a bracket 303 with a U-shaped slot 310 that can support one end of the sheath 223 of the Bowden cable 220. The Bowden cable 220 allows the remote operation of the latch mechanism 300. With the one end of the sheath 223 of the Bowden cable 220 installed in the U-shaped slot 310 of the bracket 303 and with the spherical enlargement 209 positioned in the receptacle 369, pulling the remote end (not illustrated) of the Bowden cable 220 will cause the rectilinear movement of the sliding bar 315 from the locked position to the unlocked position. This initial movement of the sliding bar 315 frees the rack bar 317 for movement to the unlatched position. The range of motion of the sliding bar 315 from the locked position to the unlocked position is relatively limited, and further pulling the remote end (not illustrated) of the Bowden cable 220 will cause the rectilinear movement of both the sliding bar 315 and the rack bar 317 together such that the rack bar 317 is moved from the latched position to the unlatched position. Consequently, the rotary magnets 306, 308, magnet carriers 318, 319, and hook-shaped pawls 334, 336 are caused to rotate from their latched positions, assuming them to initially be in the latched position, to their unlatched positions.
The Bowden cable 220 can be pulled manually or by using an electrical actuator acting at a location remote from the cable that is engaged to the receptacle 369. Generally some type of remotely located handle or push button would be provided as a user interface for the manual or electrical operation of the latch mechanism 300, respectively. A spring 371 biases the flexible link 339 to the latched position best illustrated in
The latch mechanism 300 is mounted to the compartment secured by the doors 302, 304.
The magnets 306, 308 pull the doors 302, 304 in to ensure they both latch correctly. The magnets 306, 308 control the final movement and positions of the doors 302, 304 during closing. The magnets 306, 308 also aid the opening of the doors 302, 304 when the mechanism is unlatched.
To open the latch mechanism 300 the button (not shown), for example, is pushed. This would cause the remote end of the Bowden cable 220 to be pulled by one of the mechanisms previously mentioned. The pulling of the Bowden cable 220 causes the rotation of the rotary magnets 306, 308, magnet carriers 318, 319, and hook-shaped pawls 334, 336 from their latched positions to their unlatched positions. This action disengages the hook-shaped pawls 334, 336 from their respective strikers 324, 326, which mechanically releases the doors 302 and 304. In addition, the magnets 306, 308 are rotated to their unlatched positions where these magnets repel the magnetic inserts 314, 316 attached to the doors 302, 304, forcing the doors to swing open. Once the magnets 306, 308 are clear of the influence of the magnetic field of the magnetic inserts 314, 316 and the Bowden cable 220 is released, the magnetic attraction of the north pole of one of the magnets 306, 308 for the south pole of the other one of the magnets 306, 308, or vice versa, will maintain the rotary magnets 306, 308, the magnet carriers 318, 319, and the hook-shaped pawls 334, 336 in first intermediate positions—corresponding to the open but un-actuated, at rest, condition of the magnetic latch mechanism illustrated in FIG. 20—near their unlatched positions ready for latching the doors 302, 304 as the doors 302, 304 move to the closed position. In the illustrated embodiment, the magnetic attraction of the north pole of the rotary magnet 306 for the south pole of the rotary magnet 308 maintains the rotary magnets 306, 308, the magnet carriers 318, 319, and the hook-shaped pawls 334, 336 in their first intermediate positions.
To close the doors 302, 304, one of the doors 302, 304 is pushed closed. This action pulls the other door shut through the mechanical linkage between the doors (not shown), however, one door will sometimes lag behind the other due to the free play of the linkage. Once the doors 302, 304 are almost closed the rotary magnets 306, 308, the magnet carriers 318, 319, and the hook-shaped pawls 334, 336 will begin to rotate toward their latched positions under the influence of the magnetic field of the magnetic inserts 314, 316, such that they will be in a second intermediate position nearer their latched positions. At this point the strong magnetic attraction between the magnetic inserts 314, 316 and their respective rotary magnets 306, 308 causes the lagging door to accelerate such that both doors close simultaneously, and the rotary magnets 306, 308 and the hook-shaped pawls 334, 336 simultaneously rotate to their latched positions. At this point the hook-shaped pawls 334, 336 engage the strikers 324, 326 and there is strong magnetic attraction between the magnetic inserts 314, 316 and their respective rotary magnets 306, 308. Accordingly, both doors are held in the closed position mechanically and magnetically. This condition is illustrated in
If the lag between the doors 302, 304 is great enough, one door may close completely, causing both rotary magnets 306, 308 and both hook-shaped pawls 334, 336 to move to their respective latched positions, before the lagging door reaches its closed position. In such an event, the ball bearing 372 would lock the rack bar 317 and consequently the hook-shaped pawls 334, 336 in the latched position. The striker of the lagging door will collide with the top of the respective hook-shaped pawl and the lagging door cannot move to the fully closed position. To prevent this outcome the control pins 381 and 382 are provided. Each of the control pins 381 and 382 is in the form of an elongated shaft 383 having a projecting lug 385 at one end thereof. The control pins 381 and 382 are supported by the housing 332 for rectilinear movement in the direction of the longitudinal axes of the shafts 383 between extended and retracted positions. The control pins 381 and 382 are spring biased toward the extended position by springs 388 and 390, respectively. The strikers 324, 326 are each provided with a portion or pad 391 and 392, respectively, that engage and move the respective control pin 381, 382 to the retracted position when the corresponding door 302, 304 is moved to the fully closed position.
With the control pins 381, 382 in the retracted position, the rack bar 317 is free to move between the latched and unlatched positions. The rack bar 317 is provided with tabs 393 and 395 each of which is engaged by the lug 385 of a respective control pin 381, 382 when the rack bar 317 is in a second intermediate position corresponding to the partially closed configuration of the magnetic latch mechanism and the nearly latched position of the hook-shaped pawls 334, 336 shown in
In the nearly latched or the second intermediate position the hook-shaped pawls 334, 336 can be pushed out of the way of the strikers 324, 326 as previously described and allow the lagging door to move to the closed position whereupon the control pins 381, 382 will both be in the retracted position and both hook-shaped pawls and rotary magnets can move to their latched positions to secure both doors in the closed position. The leading door will remain closed due to magnetic attraction until the lagging door is fully closed. It should be evident from the relative proportions of the hook-shaped pawls and their respective strikers, that the movement, if any, of the rotary magnets during the closing of the lagging door will be slight enough such that a strong enough attraction exists at all times during the closing of the lagging door between the striker of the lagging door and the respective rotary magnet to accomplish the closing of the lagging door as just described.
Resilient bumpers 434 can be provided at the ends of the rack bar 317 to cushion the impact of the rack bar 317 on the housing 332 to reduce noise and wear resulting from the operation of the magnetic latch mechanism 300.
The magnetic latch mechanism 300 is part of a latching system 400 that also includes a motor drive 321 for selectively pulling the Bowden cable 220 in order to pull the flexible link 339 in order to move the rack bar 317 in the direction of its longitudinal axis from the latched position to the unlatched position. The motor drive 321 includes a housing 401 that has a motor compartment 341. The motor drive 321 is provided to allow the magnetic latch mechanism 300 to be electrically actuated. In some applications it is desirable to provide a manual backup or a manual override to operate the latch mechanism 300 manually, for example, in the event of power failure. For such applications, a cylindrical enlargement 402 is provided intermediate the ends of the Bowden cable 220 such that it can be engaged by a receptacle (not shown) that is similar to receptacle 369 and that can be pulled to release or unlatch the latch mechanism 300 by some manually operated mechanism. It is also possible to arrange for the motor drive to pull on a block supported for rectilinear movement via a separate Bowden cable, while the block has receptacles that engage the remote end of the Bowden cable 220 and one end of a separate manually actuated Bowden cable to thereby allow for both manual and electrical actuation of the latch mechanism 300.
The motor drive 321 includes a motor 325 that has an output shaft 327 that is coupled to and drives the pinion gear 331. The motor drive 321 includes a torque reduction gear train that in turn includes a first gear wheel 343 and a second gear wheel 347. The gear wheels 343 and 347 are rotationally supported by the housing 401. The gear wheel 343 has a large diameter gear 404 and a concentric small diameter gear 406 that rotate together as a unit about a common rotational axis. Similarly, the gear wheel 347 has a large diameter gear 408 and a concentric small diameter gear 410 that rotate together as a unit about a common rotational axis. The axis of rotation of gear wheel 343 is parallel to and spaced apart from the axis of rotation of gear wheel 347. A motor drive bar such as a sliding rack 412 is supported for rectilinear motion by the housing 401 in response to the rotation of the small diameter gear 410. The sliding rack 412 is provided with a set of gear teeth 420 distributed along at least a portion of the length of the sliding rack 412. The set of gear teeth 420 are in constant mesh with the teeth 422 of the small diameter gear 410 of the gear wheel 347. The teeth 424 of the large diameter gear 408 of the gear wheel 347 are in constant mesh with the teeth 426 of the small diameter gear 406 of the gear wheel 343. The teeth 428 of the large diameter gear 404 of the gear wheel 343 are in constant mesh with the teeth 430 of the pinion gear 331. Thus, the sliding rack 412 moves rectilinearly between an extended position and a retracted position relative to the housing 401 in response to the rotation of the pinion gear 331. The torque reduction gear train reduces the torque output required of the motor 325.
The sliding rack 412 is provided with, for example, two receptacles 414, 416 each of which is adapted for engagement with the cylindrical enlargement at an end of a Bowden cable such as enlargement 418. This feature allows multiple latch mechanisms 300 to be operated by a single motor drive 321. In the illustrated example, two identical magnetic latch mechanisms 300 and 300a are operated by a single motor drive 321. Multiple latch mechanisms are desirable in certain applications where the doors secured by the latch mechanisms should be secured at multiple points. For example, in an automotive glove box that is secured by double doors, two magnetic latch mechanisms can be provided on either side of the glove box compartment.
Similar to the receptacle 369, each of the receptacles 414, 416 has an opening 432 at one end and a slot 433 extending down one side and at least partway through the bottom of each receptacle 414, 416. The slot 433 extends along the length of the receptacle 369 from the open end 432 of each receptacle 414, 416 to the bottom of each receptacle 414, 416 and along at least a substantial portion of the bottom of the receptacle opposite the opening 432. The slot 433 is wide enough to allow a Bowden cable, for example Bowden cable 220, to extend through the slot 433, but the slot 433 is not large enough for the cylindrical enlargement, such as for example cylindrical enlargement 418, to be pulled through the slot 433. As with enlargement 209, the cylindrical enlargement 418 may have any other shape and size such that it will not fit through the slot 433 but that it will fit into the receptacle 414 or 416. In the illustrated embodiment, the opening 432 of each receptacle 414, 416 is smaller than the diameter of the cylindrical enlargement 418, such that the cylindrical enlargement 418 is securely held in the receptacle 414 or 416 after the cylindrical enlargement 418 is snapped into the receptacle 414 or 416.
With the rack bar 317 in the latched position and the sliding bar 315 in the locked position the sliding rack 412 will be positioned in the extended position illustrated in
Once the unlatching operation is complete, using appropriate control circuitry and software, the current to the motor 325 is reversed to rotate the pinion gear 331 in a second direction that is the reverse of the first direction and returns the sliding rack 412 to its extended position ready to repeat the unlatching cycle again after the doors 302, 304 are once again closed. Returning the sliding rack 412 to its extended position, disengages the flexible link 339 from the sliding bar 315, and the magnetic attraction of the north pole of one of the magnets 306, 308 for the south pole of the other one of the magnets 306, 308, or vice versa, will maintain the rotary magnets 306, 308, the magnet carriers 318, 319, and the hook-shaped pawls 334, 336 in the first intermediate positions shown in
Also as previously described, once the doors 302, 304 are opened, the attraction between the opposite poles of the magnets 306, 308 will maintain the magnet carriers 318, 319 near their unlatched positions, i.e. in their first intermediate positions, until the doors 302, 304 are once again moved toward their closed positions. The latch 300 will thus be ready to repeat its operating cycle the next time the doors 302, 304 are moved toward their closed positions.
A fin 397 is provided that projects from one side of the rack bar 317. In addition, sensors 399, 361 are provided on the circuit board 363 that is supported by the housing 332. The sensors 399, 361 may, for example, be of a type having a light emitting diode (LED) illuminating a photo-diode. When the rack bar 317 is in the second intermediate position, i.e. the position nearer the latched position where its movement toward the latched position may be prevented by one of the control pins 381, 382 being in the extended position, the fin 397 interrupts the illumination of the photo-diode of one of the sensors 399, 361 by the corresponding LED (not shown) such that a signal indicative of a fault condition corresponding to one of the control pins being in the extended position would be generated. This signal would in turn correspond to one of the doors 302, 304 not being properly closed, for example, due to the contents of the glove box obstructing the movement of one of the doors to the closed position. The signal is supplied to the control circuit or printed circuit board (PCB) 363 controlling the operation of the magnetic latch mechanism. The control circuit is microprocessor based and is programmable. The control circuit can be programmed such that if the signal indicating that one of the doors 302, 304 is ajar persists for a time period that equals or exceeds a predetermined time limit, then the control circuit energizes the motor 325 to open the doors 302, 304, thus prompting the user, i.e. the occupant of the vehicle, to close the doors again and ensure that this time the doors are closed properly.
Wires or other types of electrical connections (not shown), such as for example prongs that plug into the motor, can be provided in the motor drive housing 401 to supply power to the motor 325 under the control of circuit board 363. The circuit board 363 also carries a jack 367 for connection of power supply and signal lines.
When the rack bar 317 is in the latched position, the fin 397 interrupts the illumination of the photo-diode of both of the sensors 399, 361 by their corresponding LEDs such that a signal indicative of the doors 302, 304 being closed would be generated. This signal will cause the circuit board 363 to enter a sleep mode until receiving the next signal to open the doors.
When the rack bar 317 is in the unlatched position, the illumination of the photo-diode of neither of the sensors 399, 361 by their corresponding LEDs is interrupted by the fin 397, which generates a signal indicative of the doors 302, 304 being open. The circuit board 363 remains active and keeps the compartment light on until the doors are closed. After a power failure with the doors open, the circuit board 363 turns on the compartment light after powering on.
The motor drive housing 401 is of the clam-shell type having a removable or separate cover 403. When the latch mechanism 300 or 300a is operated manually, the Bowden cable 220 is pulled by pulling the cylindrical enlargement 402 toward the housing 401. This causes the actuation of the latch mechanisms 300 or 300a so as to release the doors 302, 304 from the closed position. When the latch mechanism 300 or 300a is operated manually by pulling the cylindrical enlargement 402 toward the housing 401, the portion of the Bowden cable 220 between the cylindrical enlargement 402 and the cylindrical enlargement 418 is folded over on itself as shown in
It is to be understood that the present invention is not limited to the embodiments described above. Furthermore, it is to be understood that the embodiments of the present invention disclosed above are susceptible to various modifications, changes and adaptations by those skilled in the art, without departing from the spirit and scope of the invention.
This application claims the benefit of the priority of, and is the non-provisional of, U.S. provisional application for patent Ser. No. 60/879,346, filed on Jan. 6, 2007, the entirety of which is incorporated herein by reference.
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| Entry |
|---|
| Tech-Train Bulletin—Steven E. Young, Issue #16, 2002, 3 pages. |
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| Number | Date | Country | |
|---|---|---|---|
| 20080191494 A1 | Aug 2008 | US |
| Number | Date | Country | |
|---|---|---|---|
| 60879346 | Jan 2007 | US |
