1. Field of the Invention
The present invention relates generally to latch assemblies, particularly in use with a pivoting vehicle seat. More particularly, the present invention discloses an improved latch assembly, secured to an underside location of a pivotally mounted seat and which is selectively engageable with a floor-mounted striker plate. Upon being released from engagement with the striker plate, the seat is permitted to rotate to a forward dump position.
2. Description of the Prior Art
The prior art is well documented with examples of latch mechanisms, and such as which are particularly useful in selectively engaging and releasing a vehicle seat from an associated floor location of the vehicle. Such seat latch mechanisms are specifically intended, upon being disengaged, to facilitate forward pivoting, or dumping, motion of such as a rearward row of vehicle seats.
U.S. Pat. No. 6,412,849, issued to Fast, teaches a latch assembly adapted for use in a vehicle having a movable member, a fixed member, and a striker fixed to one of the movable and fixed members. The latch assembly is adapted to be connectable to the other of the movable and fixed members and to selectively couple the movable member to the striker.
The latch assembly further includes a housing, a latch and a release cam coupled to the housing, a spring, and a release mechanism. The housing includes a striker opening adapted to accommodate the striker. The latch is operable in a latched position when the latch assembly is in a latched mode wherein the latch is adapted to couple the striker to the housing and in an unlatched position when the latch assembly is in an unlatched mode and wherein the striker is freely movable relative to the housing.
The release cam is operable in an engaged position to urge the latch toward its latched position and in a released position to its unlatched position. The spring urges the release cam towards its engaged position and the latch towards its unlatched position. Finally, the release mechanism is operable for selectively moving the release cam from its engaged position to its released position.
U.S. Pat. No. 5,730,480, issued to Takamura, teaches a lock device with a striker and lock proper. The lock proper includes a base member having a striker receiving slot into which the striker can be led. A latch plate is pivotally connected to the base member. A locking plate is pivotally connected to the base member and a striker restraining member is pivotally connected though a pivot shaft to the base member. The striker restraining member is pivotal between a restraining position, where a contact edge thereof abuts against the striker, and a releasing position, where the contact edge disengages from the striker.
Springs are employed for biasing the latch plate to pivot toward a standby position, biasing the locking plate to pivot toward a lock position, and biasing the striker restraining member to pivot towards the restraining position. A link mechanism is employed for causing the striker restraining member to take the restraining position when the latch plate and the locking plate take latching and lock positions respectively. The pivot shaft of the striker restraining member is positioned at the back of the striker receiving slot, so that the contact edge of the striker restraining member can abut against a front side of the striker.
U.S. Pat. No. 6,039,401, issued to Rus, teaches a latch mechanism removably attached to a front portion of a collapsible and removable utility seat assembly to a latch rod on a vehicle floor pan. The latch mechanism includes a bracket adapted for attachment to the front portion of the utility seat assembly with a wheel attached thereto. The latch mechanism also includes a locking mechanism connected to the bracket. The locking mechanism includes a lock member rotatably connected to the bracket and adapted for engagement with the floor pan for causing rotation of the lock member with respect to the bracket to facilitate locking of the locking mechanism onto the latch rod as the utility seat assembly is collapsed.
U.S. Pat. No. 6,213,525, issued to Nicola, teaches a lever action floor latch actuation mechanism for removably securing a seat to a pair of front and rear strikers located on the floor of a vehicle. A riser having a forward leg and a rearward leg supports the seat above the vehicle floor. Front and rear latches are pivotally connected to the forward and rearward legs, respectively, for releasably securing the seat to the strikers. A longitudinal link pivotally interconnects the front and rear latches and an actuation member coupled to the link simultaneously moves the latches between a latched position engaging the strikers and an unlatched position disengaging the strikers.
Each latch includes a cinch cam pivotally connecting the latch to the riser, the cinch cam exhibiting a cylindrical outer surface terminating at a flattened cam surface. A spacer plate is fixedly secured between the latch and the riser and includes a center aperture for rotatably receiving the cinch cam. The aperture forms a circular section and a tangential slot for seating the flexible plate. The cylindrical surface of the cam engages and flexes the plate when the latch is pivoted to the latched position providing an anti-rattle biasing force between the latch and striker and the flattened surface releases the flex in the plate when the latch is pivoted to the unlatched position disengaged from the striker.
U.S. Pat. No. 5,951,086, issued to Hoshino, discloses a detaching mechanism for a vehicle seat which includes a latch claw installed on a fixed rail of a back and forth slide mechanism, as well as a lock release knob disposed between the latch claw and an operating lever for a lock release operation supported by a movable rail. An end portion of the operating lever is inserted into an inside of the back and forth slide mechanism from a through hole formed in the movable rail. The lock release knob is operated by the operating lever and an engagement between a striker disposed on a vehicle floor and the latch claw is released.
Finally, U.S. Pat. No. 4,773,693, issued to Premji et al., teaches a seat release mechanism adapted to cooperate with two generally parallel spaced mounting bars rigidly affixed to a vehicle frame forming part of the vehicle body. The latching assembly includes a bridge plate adapted for rigid attachment to the vehicle seat and dimensioned to span the distance separating a first and second of the mounting bars.
The bridge plate includes a first connecting slot for releasable securing engagement with the first mounting bar and a second connecting mechanism for releasable securing engagement with the second mounting bar. The first connecting means includes an open-ended slot formed in the bridge plate and which is adapted for surrounding engagement with the first mounting bar so as to permit pivotal movement of the bridge plate and the attached vehicle seat about the first mounting bar.
The second connecting mechanism includes a pair of opposed movable jaw members pivotally mounted on the bridge plate for independent pivotal movement between a latchable configuration in which the jaw members are adapted to enclose the second mounting bar so as to restrain pivotal movement of the seat and an unlatchable configuration in which the jaw members are adapted to open from such enclosure so as to release the second mounting bar. The vehicle seat can thus pivot about the first mounting bar for subsequent removal only when the jaw members release the second mounting bar.
The present invention is an improved latch assembly for use with a vehicle seat pivotally mounted to a vehicle floor. In particular, the latch assembly is an improvement over prior art assemblies in that it provides fixedly support brackets secured to the underside of the vehicle seat in combination with opposing and pivotally engaging latching plates for securely engaging a crosswise extending striker bar in secure and anti-chuck (non-vibrating) fashion. Upon disengagement from the striker, the seat is permitted to rotate about a forward pivot location to a forward dumped position.
In a preferred embodiment, first and second brackets are secured to the seat underside and in spaced-apart fashion. A first latch plate is secured in pivotal and sandwiching fashion, such as by a mounting collar, between the first and second brackets. The latch plate includes a first side edge disposed aperture. A cam is likewise pivotally mounted between the support brackets and defines a shoulder upon which is supported the lateral projecting location in an engaged position.
A second latch plate, defined as an anti-chuck plate, is secured in likewise pivotal fashion upon an exposed face of the second support bracket. The anti-chuck plate includes a second side edge disposed recess, substantially overlaying said first edge recess, and between which seats the striker in the engaged position.
A linkage member secures to each of the latch plate, anti-chuck plate, and cam. A first fastener seats through an arcuate slot defined along the linkage member and secures to a location of the anti-chuck plate offset from its pivot point. A second fastener extends from a further location of said linkage member, to the cam, and in order to pivotally associate the cam relative to a further fixed pivot collar extending between the brackets. A coil spring extends from a yet further location of the linkage member and secures to a generally uppermost location of the latch plate to likewise pivotally associate the latch plate relative to its mounting location with the plates.
In use, the linkage member is slidably translated, causing the anti-chuck plate to pivot in an unseating traveling direction consistent with the arcuate slot defined in the linkage member. Concurrently, the cam is pivoted by virtue of its connection to the linkage member and resultant tension on the coil spring causes the latch plate, by virtue of its configuration, to rotate in an opposite direction relative to the cam and so that the shoulder and projecting portion are unseated and the latch plate permitted to rotate to an opposite unseating direction to fully disengage the latch assembly from the striker bar.
A first end of a translating coil is secured to an end of the linkage member, a second opposite end attaching to a handle associated with the vehicle seat. In a preferred application, the handle is actuated to pivotally fold the seat back relative to the seat bottom in combination with permitting the seat to rotate to the forward dump position.
Reference will now be made to the attached drawings, when read in combination with the following detailed description, wherein like reference numerals refer to like parts throughout the several views, and in which:
Referring now to each of
As is also known, the latch assembly 10 engages a striker assembly, typically including a substantially U-shaped member secured to the vehicle floor and in particular exhibiting a crosswise extending member 16 arrayed in proximity to a floor location 18 typically associated with a rear end of the seat bottom. The seat bottom 12 is also mounted, in pivoting fashion, at 20, atop a further and forwardly disposed floor mounting location 22 associated with the seat and such that, as illustrated again by the environmental views of
A first bracket, illustrated generally at 24 and as is best shown in
A latch plate, see as generally illustrated at 42 in
A cam 60 includes an elongated and likewise substantially planar shaped body exhibiting a rounded upper edge 62 (through which is formed a first aperture 64), a rounded lower edge 66 (through which is formed a second aperture 68) and a sideways extending shoulder 70. The cam is pivotally mounted through aperture 66, by a spacer collar 72 in turn interconnected to aperture 74 defined in the first bracket 24, and in such a manner that the shoulder 70 supports a lower surface of the lateral projecting location 52 in an engaged position.
A second planar shaped and support bracket is generally illustrated at 74 (see again as best shown in
The second support bracket 72 further includes an angled portion 82, exhibiting end tabs 84, and for mounting an associated end of a translating cable 86, as will be subsequently described in additional detail. A further angular (typically 90° bent) projection 88, illustrated in an opposite facing direction from the angled portion 82, seats thereupon a rubberized and crosswise extending bumper 90, and which defines an abutment stop for unseating pivoting of the latch plate 42 as will also be subsequently described. The second support bracket 74 further includes inwardly directed bottom edge surfaces, see at 92, 94 and 96 in
A further linkage member, defined also as an anti-chuck plate (see at 98 in
A recess is defined in a side extending edge surface of the anti-chuck plate 98, see as defined by inwardly directed surfaces 106, 108 and 110, and which are arranged in opposing and overlapping relationship relative to the first recess defined in the latch plate 42 (see again inwardly directed surfaces 36, 38 and 40). As best illustrated in
A linkage member is referenced generally at 112 (see again as best shown in
The linkage member 112 is secured to each of the latch plate 42, the anti-chuck plate 98, and the cam 60. A fastener 122 inserts through the arcuate and channeled aperture 116 defined in the first planar shaped portion 114 and seats within an aligning aperture 124 defined in a substantially interior location of the planar shaped body associated with the anti-chuck plate 98.
An aperture 126, defined through the second offset and planar shaped portion 120, receives an additional pin fastener, see at 128, in inserting fashion, an extending end of the pin fastener 128 securing the upper end aperture 64 of the cam 60. A yet further aperture 130 is located at a generally uppermost end location of the linkage mechanism 112 and receives a first end 132 of a coil spring, see as further generally shown at 134.
A second extending end 136 of said coil spring 134 engages an upper edge apertured location (see at 138 in
Referencing plan view illustrations of
As is known, the inner filament 146 is translatable relative to the outer fixed cable sheath 86, in turn actuated by a handle 150 pivotally associated with the seat bottom 12 and seat back 14 (see
Referring to
Referring further to
In turn, the anti-chuck plate 98 is caused to pivot in an unseating direction relative to the striker 16 and the bottom recesses defined in the first 24 and second 74 aligning brackets and to the position illustrated in
Referring finally to
In this fashion, the latch plate 42 pivots in a direction 156 (see again
Although not clearly shown, a reengagement protocol includes the step of downward reengagement of the striker 16, between the bracket bottom edge recesses. At this point, exposed surface 158 (see
It is also understood that a number of the reference numerals exhaustively presented in
Having described my invention, other and additional preferred embodiments will become apparent to those skilled in the art to which it pertains, and without deviating from the scope of the appended claims.