US20030218368A1 - Seat lifting devices - Google Patents
Seat lifting devices Download PDFInfo
- Publication number
- US20030218368A1 US20030218368A1 US10/445,387 US44538703A US2003218368A1 US 20030218368 A1 US20030218368 A1 US 20030218368A1 US 44538703 A US44538703 A US 44538703A US 2003218368 A1 US2003218368 A1 US 2003218368A1
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- US
- United States
- Prior art keywords
- seat
- linking
- pivot axis
- threaded shaft
- lifting device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 230000007246 mechanism Effects 0.000 claims abstract description 68
- 230000000712 assembly Effects 0.000 description 7
- 238000000429 assembly Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
- B60N2/0224—Non-manual adjustments, e.g. with electrical operation
- B60N2/02246—Electric motors therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
- B60N2/0224—Non-manual adjustments, e.g. with electrical operation
- B60N2/02246—Electric motors therefor
- B60N2/02258—Electric motors therefor characterised by the mounting of the electric motor for adjusting the seat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
- B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
- B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
- B60N2/1605—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable characterised by the cinematic
- B60N2/1625—Combination of rods and slides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
- B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
- B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
- B60N2/1635—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable characterised by the drive mechanism
- B60N2/164—Linear actuator, e.g. screw mechanism
Definitions
- the present invention relates to seat vertical devices or seat lifting devices for adjusting height of a seat cushion of a vehicle seat.
- a seat vertical device or seat lifting device for adjusting height of a seat cushion of a vehicle seat is taught, for example, by U.S. Pat. No. 6,347,778 and Japanese Laid-Open Patent Publication No. 2001-163091.
- a vehicle seat comprises a seat back and a seat cushion.
- the seat back and the seat cushion are respectively supported by a seat back frame and a cushion frame.
- the cushion frame includes a pair of opposing elongated plate-shaped members or frame elements.
- the cushion frame thus constructed is seated on a seat slide device that are disposed on a vehicle floor.
- the seat slide device has a pair of slide rail assemblies that are arranged in parallel each other.
- the slide rail assemblies are positioned such that the distance therebetween is substantially identical to the distance between the frame elements of the cushion frame.
- Each of the slide rail assemblies includes an upper rail and a lower rail.
- the lower rail is affixed to the vehicle floor.
- the upper rail slidably engages the affixed lower rail.
- each of the frame elements of the cushion frame is linked to the upper rail of the slide rail assembly via front and rear linking mechanisms, which mechanisms constitute a seat lifting device.
- the front and rear linking mechanisms respectively include a front bracket and a rear bracket that are upwardly projected from the upper rail.
- the front linking mechanism further includes a front arm, which arm is pivotally attached to the frame element and the front bracket via pivot pins.
- the rear linking mechanism further includes a rear arm, which arm is pivotally attached to the frame element and the rear bracket via pivot pins.
- the seat lifting device includes a drive mechanism, which drive mechanism also constitutes the seat lifting device.
- the drive mechanism includes a lever, an intermediate bracket upwardly project from the upper rail and a linking rod.
- the lever is pivotally attached to the intermediate bracket in its middle portion.
- One end of the linking rod is pivotally connected to the rear arm.
- the other end of the linking rod is pivotally connected to an upper end of the lever.
- a nut is rotatably attached to a lower end of the lever. This nut threadably engages a threaded shaft that is driven or rotated by a drive means or motor. Therefore, when the threaded shaft is rotated by the motor, the nut moves along the threaded shaft, thereby pivoting the lever around the intermediate bracket.
- the linking rod connected to the lever moves back and forth, thereby pivoting the rear arm.
- the flame element can be lifted, so that the height of the vehicle seat cushion can be adjusted.
- the rear arm is formed with a laterally elongated slot (first slot) and a vertically elongated arcuate slot (second slot) having a plurality of concave portions arranged therealong.
- first slot a laterally elongated slot
- second slot a vertically elongated arcuate slot
- the rear arm is provided with a pivot pin that is received in the first slot and a locking pin that is received in the second slot.
- each of the frame elements of the cushion frame may be pulled forwardly and upwardly and moves in this direction.
- the rear arm rotates around the pivot pin.
- the pivot pin is received within the elongated slot, the rear arm forwardly is shifted, thereby engaging the locking pin with one of the concave portions of the second slot.
- the seat lifting device is locked, thereby preventing the frame element from further moving forwardly and upwardly.
- the rear arm can be effectively prevented from further rotating around the pivot pin. Therefore, the drive mechanism that is linked to the rear arm can be effectively prevented from being subjected to an undesirable large force.
- seat lifting devices disposed between a seat support for supporting a seat cushion and a seat mount for mounting the seat support in order to vertically adjust the seat cushion comprising a first linking mechanism movably interconnecting the seat support and the seat mount.
- the first linking mechanism comprises first and second linking arms that are respectively pivotally connected to the seat mount and the seat support via pivot axes.
- One of the pivot axes of the second linking arm comprises a movable pivot axis that is arranged and constructed to move along the second linking arm and to engage the second linking arm, so that substantial length of the second linking arm can be changed when the movable pivot axis moves along the second linking arm.
- the movable pivot axis engages the second linking arm. Therefore, even if an excessive forward force is applied to the seat support, the first linking mechanism may reliably be immobilized, thereby locking the seat lifting device. As a result, the seat support may substantially be prevented from moving.
- FIG. 1 is a side view illustrating a vehicle seat having a seat lifting device according to a first embodiment of the present teachings, in which the vehicle seat is adjusted to a lowered position;
- FIG. 2 is a side view illustrating the vehicle seat, in which the vehicle seat is adjusted to a lifted position
- FIG. 3 is an exploded partially perspective view of the seat lifting device disposed on a upper rail of a seat slide device
- FIG. 4 is a side view similar to FIG. 1, which view illustrates a vehicle seat having a seat lifting device according to a second embodiment of the present teachings.
- FIG. 5 is an exploded partially perspective view of the seat lifting device disposed on a upper rail of a seat slide device.
- FIG. 6 is a side view similar to FIG. 1, which view illustrates a vehicle seat having a seat lifting device according to a third embodiment of the present teachings.
- seat lifting devices disposed between a cushion frame for supporting a seat cushion and a seat slide device for mounting the cushion frame in order to vertically adjust the seat cushion may comprises a rear linking mechanism movably interconnecting the cushion frame and the seat slide device.
- the rear linking mechanism comprises first and second linking arms that are respectively pivotally connected to the seat slide device and the cushion frame via pivot axes.
- One of the pivot axes of the second linking arm comprises a movable pivot axis that is arranged and constructed to move along the second linking arm and to engage the second linking arm, so that substantial length of the second linking arm can be changed when the movable pivot axis moves along the second linking arm.
- the second linking arm may comprise a threaded shaft that is pivotally connected to the seat slide device and the cushion frame and a gear assembly that engages the threaded shaft.
- the gear assembly may be arranged and constructed to move along the threaded shaft.
- the movable pivot axis may be mechanically connected to the gear assembly, so as to move along the threaded shaft when the gear assembly moves along the threaded shaft.
- the seat lifting devices may further comprise a second linking mechanism movably interconnecting the cushion frame and the seat slide device.
- the second linking mechanism may comprise an elongated guide slot formed in the seat slide device and a guide pin attached to the cushion frame. The guide pin may slidably engage the guide slot.
- the seat lifting devices may further comprises an actuator.
- the actuator may preferably be arranged and constructed to drive the gear assembly, thereby relatively moving the gear assembly and the movable pivot axis attached thereto along the threaded shaft.
- first and second linking arms may preferably be connected to the cushion frame via a common pivot axis. Further, the first and second linking arms may respectively be connected to the seat slide device via first and second pivot axes. The second pivot axis may preferably be positioned behind the first pivot axis.
- the first linking mechanism may be positioned adjacent to a seatbelt connecting position on the seat support.
- a vehicle seat 1 of this embodiment generally comprises a seat back 4 and a seat cushion 10 .
- the seat back 4 and the seat cushion 10 are respectively supported by a seat back frame 2 and a cushion frame (i.e., seat support) 8 .
- the cushion frame 8 includes a pair of opposing elongated plate-shaped members or frame elements 12 (one of which is shown) and a connector member (not shown).
- Each of the frame elements 12 has a front portion 12 a and a rear portion 12 b .
- the rear portions 12 b of the frame elements 12 are interconnected by the connector member, thereby defining the cushion frame 8 as a unit.
- a seatbelt 18 may preferably connected to the frame elements 12 via seatbelt connectors (not shown) that are positioned adjacent to the rear portions 12 b.
- the cushion frame 8 thus constructed is seated on a pair of slide rail assemblies 3 (one of which is shown) of a seat slide device (i.e., seat mount) that are disposed in parallel on a vehicle floor (not shown).
- the slide rail assemblies 3 may be positioned such that the distance therebetween is substantially identical to the distance between the frame elements 12 of the cushion frame 8 .
- Each of the slide rail assemblies 3 may include an upper rail 16 and a lower rail 14 .
- the lower rail 14 may be affixed to the vehicle floor.
- the upper rail 16 slidably engages the affixed lower rail 14 .
- the frame elements 12 of the cushion frame 8 are linked to the upper rails 16 via a pair of first or rear linking mechanisms 30 (one of which is shown) and a pair of second or front linking mechanisms 20 (one of which is shown), which mechanisms constitute a seat lifting device.
- the cushion frame 8 may preferably be operatively connected to the slide rail assemblies 16 .
- the cushion frame 8 can be moved back and forth by sliding the upper rail 16 back and forth along the lower rail 14 . Therefore, the longitudinal position of the seat cushion 10 can be adjusted by sliding the upper rail 16 along the lower rail 14 . In addition, the cushion frame 8 can be moved up and down by operating the seat lifting device. Therefore, the vertical position of the seat cushion 8 can be adjusted by operating the seat lifting device.
- each of the front linking mechanisms 20 of the seat lifting device may preferably include a guide bracket 22 that is fixed to an upper surface 16 a of the upper rail 16 .
- the guide bracket 22 is formed with an elongated arcuate guide slot 22 a that is vertically extended and fowardly curved with respect to the upper rail 16 .
- the front linking mechanism 20 may include a guide pin 24 that is attached to the front portion 12 a of the frame element 12 .
- the guide pin 24 slidably engages the guide slot 22 a such that the front portion 12 a of the frame element 12 can move vertically and longitudinally with respect to the upper rail 16 along an arcuate path that is defined by the guide slot 22 a.
- each of the rear linking mechanisms 30 of the seat lifting device may include a plate-shaped linking arm (i.e., first linking arm) 36 .
- the rear linking mechanism 30 may preferably include a first or pivot bracket 32 and a second or support bracket 34 that are fixed to the upper surface 16 a of the upper rail 16 .
- An upper end of the linking arm 36 is pivotally connected to the rear portion 12 b of the frame element 12 via a pivot axis or pivot pin 38 such that the arm 36 can pivot back and forth around the pivot pin 38 .
- a lower end of the linking arm 36 is pivotally connected to the support bracket 34 via a first pivot axis or pivot pin 39 such that the arm 36 can pivot back and forth around the pivot pin 39 .
- the rear linking mechanism 30 may preferably include a retainer 48 that is fixedly connected to the rear portion 12 b of the frame element 12 by appropriate fixing means.
- the retainer 48 is fixed to the frame element rear portion 12 b by engaging apertures 48 a formed in the retainer 48 with fixture pins 52 provided to the rear portion 12 b and then caulking the fixture pins 52 or attaching E-rings (not shown) to the fixture pins 52 .
- the fixing means of the retainer 48 is not limited to this embodiment.
- the retainer 48 can be fixed to the frame element rear portion 12 b by utilizing apertures (not shown) formed in the retainer 48 and the rear portion 12 b and bolts (not shown) and nuts (not shown).
- the seat lifting device may further include a pair of drive mechanisms 40 (one of which is shown).
- Each of the drive mechanisms 40 may preferably includes a drive source assembly that comprises a gear box 44 and an actuator or motor 42 .
- the gear box 44 and the motor 42 may preferably be vertically positioned.
- the motor 42 is combined to the gear box 44 such that a drive gear (not shown) received in the gear box 44 is driven when the motor 42 is driven.
- the gear box 44 has a threaded shaft (i.e., second linking arm) 46 extending therethrough.
- the threaded shaft 46 threadably engages the drive gear received in the gear box 44 such that the gear box 44 moves along the threaded shaft 46 when the motor 42 is forwardly or reversely driven.
- the gear box 44 is movably or rotatably connected to the retainer 48 via a pivot axis or pivot pin 50 . Therefore, the pivot pin 50 can move along the threaded shaft 46 when the gear box 44 moves along the threaded shaft 46 . Further, the pivot pin 50 may preferably be aligned with the pivot pin 38 of the linking arm 36 . As a result, the gear box 44 and the upper end of the linking arm 36 are connected to the rear portion 12 b of the frame element 12 via a common pivot axis. Further, the threaded shaft 46 has an aperture 46 a that is formed in its rear end.
- the rear end of the threaded shaft 46 is pivotally connected to the support bracket 34 via a second pivot axis or pivot pin 54 received in the aperture 46 a such that the threaded shaft 46 can pivot back and forth around the pivot pin 54 .
- the gear box 44 and the threaded shaft 46 may function as a part of the rear linking mechanism 30 .
- the gear box 44 and the threaded shaft 46 may preferably constitute both of the drive mechanism 40 and the rear linking mechanism 30 .
- the pivot pins 38 and 50 is not limited to this embodiment.
- the pivot pin 38 can be extended along a longitudinal axis thereof, so that the gear box 44 can be pivotally connected to the retainer 48 via an extended end of the pivot pin 38 .
- the pivot pin 50 can be omitted.
- the seat lifting device of this embodiment when each of the drive mechanisms 40 is actuated, the front and rear linking mechanisms 20 and 30 of the seat lifting device are operated, thereby changing height of the seat cushion 10 . That is, when the motor 42 of the drive mechanism 40 is driven forwardly or reversely, the gear box 44 moves forwardly or backwardly along the threaded shaft 46 , thereby changing substantial length of the threaded shaft 46 . As a result, the pivot pins 38 and 50 of the rear linking mechanisms 30 moves vertically and longitudinally relative to the upper rail 16 while the linking arm 36 and the threaded shaft 46 respectively pivotally rotate around the pivot pin 39 and the pivot pin 54 .
- the seat cushion 10 may preferably be continuously vertically adjusted, so as to have various vertical positions (e.g., a lowered position (FIG. 1) and a lifted position (FIG. 2)).
- each of the frame elements 12 of the cushion frame 8 is pulled forwardly and upwardly.
- the front and rear linking mechanisms 20 and 30 that is linked to the frame element 12 are pulled in this direction.
- the rear linking mechanism 30 may preferably be immobilized, thereby locking the seat lifting device.
- the frame element 12 may be substantially prevented from moving forwardly and upwardly. That is, the seat cushion 10 may be prevented from moving forwardly and upwardly. Therefore, the drive mechanism 40 , for example, may be prevented from being applied with a considerable large force.
- the seat lifting device is always locked unless the drive mechanisms 40 is actuated.
- the drive mechanism 40 can be reliably prevented from being applied with such a considerable force.
- the gear box 44 and the threaded shaft 46 of the drive mechanism 40 constitute a part of the rear linking mechanism 30 . Therefore, the seat lifting device can be simplified.
- the seat lifting device is not limited to the representative embodiment.
- the front linking mechanism 20 may include a linking arm that is pivotally connected to the front portion 12 a of the frame element 12 and the upper rail 16 .
- the front linking mechanism 20 may include a pair of linking arms that are pivotally connected to the frame element front portion 12 a and the upper rail 16 .
- the seat lifting device may further include a pair of drive mechanisms 240 (one of which is shown).
- Each of the drive mechanisms 240 may preferably includes a drive source assembly that comprises a gear box 244 and a motor 242 .
- the motor 242 is separate from the gear box 244 . That is, the motor 242 is positioned in the front portion 12 a of the frame element 12 and fixed thereto. The motor 242 thus positioned is coupled to the gear box 244 via a power transmitting member 243 , such as a rotating cable or a rotating shaft, such that a drive gear (not shown) received in the gear box 244 is driven when the motor 242 is driven.
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- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Seats For Vehicles (AREA)
- Chairs Characterized By Structure (AREA)
Abstract
Seat lifting devices disposed between a seat support for supporting a seat cushion and a seat mount for mounting the seat support in order to vertically adjust the seat cushion are taught that comprise a first linking mechanism movably interconnecting the seat support and the seat mount. The first linking mechanism comprises first and second linking arms that are respectively pivotally connected to the seat mount and the seat support via pivot axes. One of the pivot axes of the second linking arm comprises a movable pivot axis that is arranged and constructed to move along the second linking arm and to engage the second linking arm, so that substantial length of the second linking arm can be changed when the movable pivot axis moves along the second linking arm.
Description
- This application claims priority to Japanese Patent Application Serial Number 2002-150970, the contents of which are incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to seat vertical devices or seat lifting devices for adjusting height of a seat cushion of a vehicle seat.
- 2. Description of the Related Art
- A seat vertical device or seat lifting device for adjusting height of a seat cushion of a vehicle seat is taught, for example, by U.S. Pat. No. 6,347,778 and Japanese Laid-Open Patent Publication No. 2001-163091.
- Typically, a vehicle seat comprises a seat back and a seat cushion. The seat back and the seat cushion are respectively supported by a seat back frame and a cushion frame. The cushion frame includes a pair of opposing elongated plate-shaped members or frame elements. The cushion frame thus constructed is seated on a seat slide device that are disposed on a vehicle floor. The seat slide device has a pair of slide rail assemblies that are arranged in parallel each other. The slide rail assemblies are positioned such that the distance therebetween is substantially identical to the distance between the frame elements of the cushion frame. Each of the slide rail assemblies includes an upper rail and a lower rail. The lower rail is affixed to the vehicle floor. The upper rail slidably engages the affixed lower rail.
- In the known art described in U.S. Pat. No. 6,347,778, each of the frame elements of the cushion frame is linked to the upper rail of the slide rail assembly via front and rear linking mechanisms, which mechanisms constitute a seat lifting device. The front and rear linking mechanisms respectively include a front bracket and a rear bracket that are upwardly projected from the upper rail. The front linking mechanism further includes a front arm, which arm is pivotally attached to the frame element and the front bracket via pivot pins. Similarly, the rear linking mechanism further includes a rear arm, which arm is pivotally attached to the frame element and the rear bracket via pivot pins.
- Further, the seat lifting device includes a drive mechanism, which drive mechanism also constitutes the seat lifting device. The drive mechanism includes a lever, an intermediate bracket upwardly project from the upper rail and a linking rod. The lever is pivotally attached to the intermediate bracket in its middle portion. One end of the linking rod is pivotally connected to the rear arm. Also, the other end of the linking rod is pivotally connected to an upper end of the lever. Further, a nut is rotatably attached to a lower end of the lever. This nut threadably engages a threaded shaft that is driven or rotated by a drive means or motor. Therefore, when the threaded shaft is rotated by the motor, the nut moves along the threaded shaft, thereby pivoting the lever around the intermediate bracket. As a result, the linking rod connected to the lever moves back and forth, thereby pivoting the rear arm. Thus, the flame element can be lifted, so that the height of the vehicle seat cushion can be adjusted.
- In the known seat lifting device, the rear arm is formed with a laterally elongated slot (first slot) and a vertically elongated arcuate slot (second slot) having a plurality of concave portions arranged therealong. On the other hand, the rear arm is provided with a pivot pin that is received in the first slot and a locking pin that is received in the second slot.
- According to the known seat lifting device, when an excessive forward and upward force is applied to the cushion frame via a seatbelt that is attached thereto, each of the frame elements of the cushion frame may be pulled forwardly and upwardly and moves in this direction. As a result, the rear arm rotates around the pivot pin. However, because the pivot pin is received within the elongated slot, the rear arm forwardly is shifted, thereby engaging the locking pin with one of the concave portions of the second slot. Thus, the seat lifting device is locked, thereby preventing the frame element from further moving forwardly and upwardly. As a result, the rear arm can be effectively prevented from further rotating around the pivot pin. Therefore, the drive mechanism that is linked to the rear arm can be effectively prevented from being subjected to an undesirable large force.
- As will be recognized, if the seat lifting device is not locked when the excessive forward and upward force is applied to the cushion frame, the frame element cannot be prevented from moving forwardly and upwardly. Therefore, the rear arm can freely rotate around the pivot pin. As a result, a considerable force may be applied to the drive mechanism linked to the rear arm. Such a force may exert undesirable effects on the drive mechanism.
- It is, accordingly, one object of the present teachings to provide improved seat lifting devices for adjusting height of a seat cushion of a vehicle seat.
- For example, in one aspect of the present teachings, seat lifting devices disposed between a seat support for supporting a seat cushion and a seat mount for mounting the seat support in order to vertically adjust the seat cushion are taught that comprises a first linking mechanism movably interconnecting the seat support and the seat mount. The first linking mechanism comprises first and second linking arms that are respectively pivotally connected to the seat mount and the seat support via pivot axes. One of the pivot axes of the second linking arm comprises a movable pivot axis that is arranged and constructed to move along the second linking arm and to engage the second linking arm, so that substantial length of the second linking arm can be changed when the movable pivot axis moves along the second linking arm.
- In such seat lifting devices, the movable pivot axis engages the second linking arm. Therefore, even if an excessive forward force is applied to the seat support, the first linking mechanism may reliably be immobilized, thereby locking the seat lifting device. As a result, the seat support may substantially be prevented from moving.
- Other objects, features and advantage of the present invention will be ready understood after reading the following detailed description together with the accompanying drawings and the claims.
- FIG. 1 is a side view illustrating a vehicle seat having a seat lifting device according to a first embodiment of the present teachings, in which the vehicle seat is adjusted to a lowered position;
- FIG. 2 is a side view illustrating the vehicle seat, in which the vehicle seat is adjusted to a lifted position;
- FIG. 3 is an exploded partially perspective view of the seat lifting device disposed on a upper rail of a seat slide device;
- FIG. 4 is a side view similar to FIG. 1, which view illustrates a vehicle seat having a seat lifting device according to a second embodiment of the present teachings; and
- FIG. 5 is an exploded partially perspective view of the seat lifting device disposed on a upper rail of a seat slide device; and
- FIG. 6 is a side view similar to FIG. 1, which view illustrates a vehicle seat having a seat lifting device according to a third embodiment of the present teachings.
- In one embodiment of the present teachings, seat lifting devices disposed between a cushion frame for supporting a seat cushion and a seat slide device for mounting the cushion frame in order to vertically adjust the seat cushion may comprises a rear linking mechanism movably interconnecting the cushion frame and the seat slide device. The rear linking mechanism comprises first and second linking arms that are respectively pivotally connected to the seat slide device and the cushion frame via pivot axes. One of the pivot axes of the second linking arm comprises a movable pivot axis that is arranged and constructed to move along the second linking arm and to engage the second linking arm, so that substantial length of the second linking arm can be changed when the movable pivot axis moves along the second linking arm.
- Optionally, the second linking arm may comprise a threaded shaft that is pivotally connected to the seat slide device and the cushion frame and a gear assembly that engages the threaded shaft. Preferably, the gear assembly may be arranged and constructed to move along the threaded shaft. Preferably, the movable pivot axis may be mechanically connected to the gear assembly, so as to move along the threaded shaft when the gear assembly moves along the threaded shaft.
- Optionally, the seat lifting devices may further comprise a second linking mechanism movably interconnecting the cushion frame and the seat slide device. The second linking mechanism may comprise an elongated guide slot formed in the seat slide device and a guide pin attached to the cushion frame. The guide pin may slidably engage the guide slot.
- Further, the seat lifting devices may further comprises an actuator. The actuator may preferably be arranged and constructed to drive the gear assembly, thereby relatively moving the gear assembly and the movable pivot axis attached thereto along the threaded shaft.
- Optionally, the first and second linking arms may preferably be connected to the cushion frame via a common pivot axis. Further, the first and second linking arms may respectively be connected to the seat slide device via first and second pivot axes. The second pivot axis may preferably be positioned behind the first pivot axis.
- Preferably, the first linking mechanism may be positioned adjacent to a seatbelt connecting position on the seat support.
- Two detailed representative embodiments of the present teachings will now be described in further detail with reference to FIGS.1 to 5.
- First Detailed Representative Embodiment
- The first detailed representative embodiment will now be described with reference to FIGS.1 to 3.
- As shown in FIGS. 1 and 2, a
vehicle seat 1 of this embodiment generally comprises a seat back 4 and aseat cushion 10. The seat back 4 and theseat cushion 10 are respectively supported by a seat backframe 2 and a cushion frame (i.e., seat support) 8. Typically, thecushion frame 8 includes a pair of opposing elongated plate-shaped members or frame elements 12 (one of which is shown) and a connector member (not shown). Each of theframe elements 12 has afront portion 12 a and arear portion 12 b. Therear portions 12 b of theframe elements 12 are interconnected by the connector member, thereby defining thecushion frame 8 as a unit. In addition, aseatbelt 18 may preferably connected to theframe elements 12 via seatbelt connectors (not shown) that are positioned adjacent to therear portions 12 b. - The
cushion frame 8 thus constructed is seated on a pair of slide rail assemblies 3 (one of which is shown) of a seat slide device (i.e., seat mount) that are disposed in parallel on a vehicle floor (not shown). Theslide rail assemblies 3 may be positioned such that the distance therebetween is substantially identical to the distance between theframe elements 12 of thecushion frame 8. Each of theslide rail assemblies 3 may include anupper rail 16 and alower rail 14. Thelower rail 14 may be affixed to the vehicle floor. Theupper rail 16 slidably engages the affixedlower rail 14. In addition, theframe elements 12 of thecushion frame 8 are linked to theupper rails 16 via a pair of first or rear linking mechanisms 30 (one of which is shown) and a pair of second or front linking mechanisms 20 (one of which is shown), which mechanisms constitute a seat lifting device. Thus, thecushion frame 8 may preferably be operatively connected to theslide rail assemblies 16. - The
cushion frame 8 can be moved back and forth by sliding theupper rail 16 back and forth along thelower rail 14. Therefore, the longitudinal position of theseat cushion 10 can be adjusted by sliding theupper rail 16 along thelower rail 14. In addition, thecushion frame 8 can be moved up and down by operating the seat lifting device. Therefore, the vertical position of theseat cushion 8 can be adjusted by operating the seat lifting device. - As shown in FIGS.1 to 3, each of the
front linking mechanisms 20 of the seat lifting device may preferably include aguide bracket 22 that is fixed to anupper surface 16 a of theupper rail 16. Theguide bracket 22 is formed with an elongatedarcuate guide slot 22 a that is vertically extended and fowardly curved with respect to theupper rail 16. Further, thefront linking mechanism 20 may include aguide pin 24 that is attached to thefront portion 12 a of theframe element 12. Theguide pin 24 slidably engages theguide slot 22 a such that thefront portion 12 a of theframe element 12 can move vertically and longitudinally with respect to theupper rail 16 along an arcuate path that is defined by theguide slot 22 a. - As best shown in FIG. 3, each of the
rear linking mechanisms 30 of the seat lifting device may include a plate-shaped linking arm (i.e., first linking arm) 36. Further, therear linking mechanism 30 may preferably include a first orpivot bracket 32 and a second orsupport bracket 34 that are fixed to theupper surface 16 a of theupper rail 16. An upper end of the linkingarm 36 is pivotally connected to therear portion 12 b of theframe element 12 via a pivot axis orpivot pin 38 such that thearm 36 can pivot back and forth around thepivot pin 38. A lower end of the linkingarm 36 is pivotally connected to thesupport bracket 34 via a first pivot axis orpivot pin 39 such that thearm 36 can pivot back and forth around thepivot pin 39. - Also, the
rear linking mechanism 30 may preferably include aretainer 48 that is fixedly connected to therear portion 12 b of theframe element 12 by appropriate fixing means. In this embodiment, theretainer 48 is fixed to the frame elementrear portion 12 b by engagingapertures 48 a formed in theretainer 48 with fixture pins 52 provided to therear portion 12 b and then caulking the fixture pins 52 or attaching E-rings (not shown) to the fixture pins 52. - Further, the fixing means of the
retainer 48 is not limited to this embodiment. For example, theretainer 48 can be fixed to the frame elementrear portion 12 b by utilizing apertures (not shown) formed in theretainer 48 and therear portion 12 b and bolts (not shown) and nuts (not shown). - As best shown in FIG. 3, the seat lifting device may further include a pair of drive mechanisms40 (one of which is shown). Each of the
drive mechanisms 40 may preferably includes a drive source assembly that comprises agear box 44 and an actuator ormotor 42. Thegear box 44 and themotor 42 may preferably be vertically positioned. Themotor 42 is combined to thegear box 44 such that a drive gear (not shown) received in thegear box 44 is driven when themotor 42 is driven. In addition, thegear box 44 has a threaded shaft (i.e., second linking arm) 46 extending therethrough. As will be appreciated, the threadedshaft 46 threadably engages the drive gear received in thegear box 44 such that thegear box 44 moves along the threadedshaft 46 when themotor 42 is forwardly or reversely driven. - As shown in FIG. 3, the
gear box 44 is movably or rotatably connected to theretainer 48 via a pivot axis orpivot pin 50. Therefore, thepivot pin 50 can move along the threadedshaft 46 when thegear box 44 moves along the threadedshaft 46. Further, thepivot pin 50 may preferably be aligned with thepivot pin 38 of the linkingarm 36. As a result, thegear box 44 and the upper end of the linkingarm 36 are connected to therear portion 12 b of theframe element 12 via a common pivot axis. Further, the threadedshaft 46 has anaperture 46 a that is formed in its rear end. The rear end of the threadedshaft 46 is pivotally connected to thesupport bracket 34 via a second pivot axis orpivot pin 54 received in theaperture 46 a such that the threadedshaft 46 can pivot back and forth around thepivot pin 54. As will be appreciated, thegear box 44 and the threadedshaft 46 may function as a part of therear linking mechanism 30. In other words, thegear box 44 and the threadedshaft 46 may preferably constitute both of thedrive mechanism 40 and therear linking mechanism 30. - Further, the pivot pins38 and 50 is not limited to this embodiment. For example, the
pivot pin 38 can be extended along a longitudinal axis thereof, so that thegear box 44 can be pivotally connected to theretainer 48 via an extended end of thepivot pin 38. According to this construction, thepivot pin 50 can be omitted. - According to the seat lifting device of this embodiment, when each of the
drive mechanisms 40 is actuated, the front andrear linking mechanisms seat cushion 10. That is, when themotor 42 of thedrive mechanism 40 is driven forwardly or reversely, thegear box 44 moves forwardly or backwardly along the threadedshaft 46, thereby changing substantial length of the threadedshaft 46. As a result, the pivot pins 38 and 50 of therear linking mechanisms 30 moves vertically and longitudinally relative to theupper rail 16 while the linkingarm 36 and the threadedshaft 46 respectively pivotally rotate around thepivot pin 39 and thepivot pin 54. At this time, theguide pin 24 of thefront linking mechanism 20 synchronously moves along theguide slot 22 a of theguide bracket 22. Consequently, the front andrear linking mechanisms frame elements 12 linked to the linkingmechanisms seat cushion 10 may preferably be continuously vertically adjusted, so as to have various vertical positions (e.g., a lowered position (FIG. 1) and a lifted position (FIG. 2)). - According to the seat lifting device of this embodiment, when an excessive forward force is applied to the
cushion frame 8 via theseatbelt 18 that is attached thereto, each of theframe elements 12 of thecushion frame 8 is pulled forwardly and upwardly. As a result, the front andrear linking mechanisms frame element 12 are pulled in this direction. However, because the drive gear received in thegear box 44 threadably engages the threadedshaft 46, therear linking mechanism 30 may preferably be immobilized, thereby locking the seat lifting device. As a result, theframe element 12 may be substantially prevented from moving forwardly and upwardly. That is, theseat cushion 10 may be prevented from moving forwardly and upwardly. Therefore, thedrive mechanism 40, for example, may be prevented from being applied with a considerable large force. - In this embodiment, the seat lifting device is always locked unless the
drive mechanisms 40 is actuated. As a result, even if the excessive forward force is applied to thecushion frame 8, theframe element 12 can be maintained in place without moving forwardly and upwardly. Therefore, thedrive mechanism 40 can be reliably prevented from being applied with such a considerable force. - Further, in this embodiment, the
gear box 44 and the threadedshaft 46 of thedrive mechanism 40 constitute a part of therear linking mechanism 30. Therefore, the seat lifting device can be simplified. - Further, the seat lifting device is not limited to the representative embodiment. For example, the
front linking mechanism 20 may include a linking arm that is pivotally connected to thefront portion 12 a of theframe element 12 and theupper rail 16. Moreover, thefront linking mechanism 20 may include a pair of linking arms that are pivotally connected to the frameelement front portion 12 a and theupper rail 16. - Second Detailed Representative Embodiment
- The second detailed representative embodiment will now described with reference to FIGS. 4 and 5. Because the second embodiment relates to the first embodiment, only constructions and elements that are different from the first embodiment will be explained in detail. Elements that are the same in the first embodiment will be identified by the same reference numerals and detailed description of such elements will be omitted.
- In this embodiment, the seat lifting device may further include a pair of drive mechanisms140 (one of which is shown). Each of the
drive mechanisms 140 may preferably includes a drive source assembly that comprises agear box 144 and amotor 142. As best shown in FIG. 5, unlike the first embodiment, thegear box 144 and themotor 142 may preferably be laterally or horizontally positioned. - Third Detailed Representative Embodiment
- The third detailed representative embodiment will now described with reference to FIG. 6. Because the third embodiment relates to the first and second embodiments, only constructions and elements that are different from the first and second embodiments will be explained in detail. Elements that are the same in the first and second embodiments will be identified by the same reference numerals and detailed description of such elements will be omitted.
- In this embodiment, the seat lifting device may further include a pair of drive mechanisms240 (one of which is shown). Each of the
drive mechanisms 240 may preferably includes a drive source assembly that comprises agear box 244 and amotor 242. As shown in FIG. 6, unlike the first and second embodiments, themotor 242 is separate from thegear box 244. That is, themotor 242 is positioned in thefront portion 12 a of theframe element 12 and fixed thereto. Themotor 242 thus positioned is coupled to thegear box 244 via apower transmitting member 243, such as a rotating cable or a rotating shaft, such that a drive gear (not shown) received in thegear box 244 is driven when themotor 242 is driven. - Representative examples of the present teachings have been described in detail with reference to the attached drawings. This detailed description is merely intended to teach a person of skill in the art further details for practicing preferred aspects of the present teachings and is not intended to limit the scope of the invention. Only the claims define the scope of the claimed invention. Therefore, combinations of features and steps disclosed in the foregoing detail description may not be necessary to practice the invention in the broadest sense, and are instead taught merely to particularly describe detailed representative examples of the invention. Moreover, the various features taught in this specification may be combined in ways that are not specifically enumerated in order to obtain additional useful embodiments of the present teachings.
Claims (16)
1. A seat lifting device disposed between a seat support for supporting a seat cushion and a seat mount for mounting the seat support in order to vertically adjust the seat cushion, comprising:
a first linking mechanism movably interconnecting the seat support and the seat mount, the first linking mechanism comprising first and second linking arms that are respectively pivotally connected to the seat mount and the seat support via pivot axes,
wherein one of the pivot axes of the second linking arm comprises a movable pivot axis that is arranged and constructed to move along the second linking arm and to engage the second linking arm, so that substantial length of the second linking arm can be changed when the movable pivot axis moves along the second linking arm.
2. A seat lifting device as defined in claim 1 , wherein the second linking arm comprises a threaded shaft that is pivotally connected to the seat mount and the seat support and a gear assembly having a nut that engages the threaded shaft, the gear assembly is arranged and constructed to move along the threaded shaft, and wherein the movable pivot axis is mechanically connected to the gear assembly, so as to move along the threaded shaft when the gear assembly moves along the threaded shaft.
3. A seat lifting device disposed between a seat support for supporting a seat cushion and a seat mount for mounting the seat support in order to vertically adjust the seat cushion, comprising:
a pair of first linking mechanisms movably interconnecting the seat support and the seat mount, at least one of the first linking mechanisms comprising first and second linking arms that are respectively pivotally connected to the seat mount and the seat support via pivot axes,
wherein one of the pivot axes of the second linking arm comprises a movable pivot axis that is arranged and constructed to move along the second linking arm and to engage the second linking arm, so that substantial length of the second linking arm can be changed when the movable pivot axis moves along the second linking arm.
4. A seat lifting device as defined in claim 3 , wherein the second linking arm comprises a threaded shaft that is pivotally connected to the seat mount and the seat support and a gear assembly having a nut that engages the threaded shaft, the gear assembly is arranged and constructed to move along the threaded shaft, and wherein the movable pivot axis is mechanically connected to the gear assembly, so as to move along the threaded shaft when the gear assembly moves along the threaded shaft.
5. A seat lifting device as defined in claim 4 further comprising a second linking mechanism movably interconnecting the seat support and the seat mount, wherein the second linking mechanism comprises an elongated guide slot formed in the seat mount and a guide pin attached to the seat support, and wherein the guide pin slidably engages the guide slot.
6. A seat lifting device as defined in claim 2 further comprising an actuator, wherein the actuator is arranged and constructed to drive the gear assembly, thereby moving the gear assembly and the movable pivot axis attached thereto along the threaded shaft.
7. A seat lifting device as defined in claim 4 further comprising an actuator, wherein the actuator is arranged and constructed to drive the gear assembly, thereby moving the gear assembly and the movable pivot axis attached thereto along the threaded shaft.
8. A seat lifting device as defined in claim 5 further comprising an actuator, wherein the actuator is arranged and constructed to drive the gear assembly, thereby moving the gear assembly and the movable pivot axis attached thereto along the threaded shaft.
9. A seat lifting device disposed between a seat support for supporting a seat cushion and a seat mount for mounting the seat support in order to vertically adjust the seat cushion, comprising:
a pair of first linking mechanisms movably interconnecting the seat support and the seat mount, at least one of the first linking mechanisms comprising first and second linking arms that are respectively pivotally connected to the seat mount and the seat support via pivot axes; and
a second linking mechanism movably interconnecting the seat support and the seat mount, the second linking mechanism comprising an elongated guide slot formed in the seat mount and a guide pin attached to the seat support, the guide pin slidably engaging the guide slot,
wherein one of the pivot axes of the second linking arm comprises a movable pivot axis that is arranged and constructed to move along the second linking arm and to engage the second linking arm, so that substantial length of the second linking arm can be changed when the movable pivot axis moves along the second linking arm, wherein the second linking arm comprises a threaded shaft that is pivotally connected to the seat mount and the seat support and a gear assembly having a nut that engages the threaded shaft, the gear assembly is arranged and constructed to move along the threaded shaft, and wherein the movable pivot axis is mechanically connected to the gear assembly, so as to move along the threaded shaft when the gear assembly moves along the threaded shaft.
10. A seat lifting device as defined in claim 1 , wherein the first and second linking arms are connected to the seat support via a common pivot axis, and wherein the first and second linking arms are respectively connected to the seat mount via first and second pivot axes, the second pivot axis is positioned behind the first pivot axis.
11. A seat lifting device as defined in claim 3 , wherein the first and second linking arms are connected to the seat support via a common pivot axis, and wherein the first and second linking arms are respectively connected to the seat mount via first and second pivot axes, the second pivot axis is positioned behind the first pivot axis.
12. A seat lifting device as defined in claim 9 , wherein the first and second linking arms are connected to the seat support via a common pivot axis, and wherein the first and second linking arms are respectively connected to the seat mount via first and second pivot axes, the second pivot axis is positioned behind the first pivot axis.
13. A seat lifting device as defined in claim 2 , wherein the first linking mechanism is positioned adjacent to a seatbelt connecting position on the seat support.
14. A seat lifting device as defined in claim 4 , wherein the first linking mechanism is positioned adjacent to a seatbelt connecting position on the seat support.
15. A seat lifting device as defined in claim 5 , wherein the first linking mechanism is positioned adjacent to a seatbelt connecting position on the seat support.
16. A seat lifting device as defined in claim 9 , wherein the first linking mechanism is positioned adjacent to a seatbelt connecting position on the seat support.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-150970 | 2002-05-24 | ||
JP2002150970A JP4032827B2 (en) | 2002-05-24 | 2002-05-24 | Seat vertical device |
Publications (1)
Publication Number | Publication Date |
---|---|
US20030218368A1 true US20030218368A1 (en) | 2003-11-27 |
Family
ID=29545344
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/445,387 Abandoned US20030218368A1 (en) | 2002-05-24 | 2003-05-23 | Seat lifting devices |
Country Status (2)
Country | Link |
---|---|
US (1) | US20030218368A1 (en) |
JP (1) | JP4032827B2 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060217881A1 (en) * | 2005-03-28 | 2006-09-28 | Sap Aktiengesellschaft | Incident command post |
FR2908699A1 (en) * | 2006-11-17 | 2008-05-23 | Faurecia Sieges Automobile | Motor vehicle seat, has connecting unit including sliding pivot with translating direction oriented upwards and downwards such that base is moved rearwards and upwards when crossbeam passes from lowered position to raised position |
FR2910398A3 (en) * | 2006-12-21 | 2008-06-27 | Renault Sas | Motor vehicle seat, has base connected to floor along platform with driving unit driving backrest with respect to base, where driving unit includes rod with toothed wheel that is fixed to another toothed wheel of rotational axis |
CN102973032A (en) * | 2011-09-02 | 2013-03-20 | 王凯旋 | Lift-type exercise machine with no need for electric energy |
US20150076309A1 (en) * | 2012-05-07 | 2015-03-19 | Johnson Controls Technology Company | Seat adjustment device for vertical adjustment of a vehicle seat |
US9511688B2 (en) | 2012-05-07 | 2016-12-06 | Johnson Controls Technology Company | Seating part of a vehicle seat |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008105520A (en) * | 2006-10-25 | 2008-05-08 | Shiroki Corp | Driving mechanism of vehicular power seat |
KR200468289Y1 (en) * | 2008-10-31 | 2013-08-12 | 주식회사다스 | Seat Height Adjusting Apparatus |
DE102020208832A1 (en) | 2020-07-15 | 2022-01-20 | Brose Fahrzeugteile SE & Co. Kommanditgesellschaft, Coburg | Assembly of a vehicle seat with a linear adjustment device |
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-
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US3006594A (en) * | 1958-11-12 | 1961-10-31 | Gen Motors Corp | Linkage seat adjuster with straight line movement |
US3149815A (en) * | 1963-03-25 | 1964-09-22 | Gen Motors Corp | Manual seat adjuster |
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Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060217881A1 (en) * | 2005-03-28 | 2006-09-28 | Sap Aktiengesellschaft | Incident command post |
FR2908699A1 (en) * | 2006-11-17 | 2008-05-23 | Faurecia Sieges Automobile | Motor vehicle seat, has connecting unit including sliding pivot with translating direction oriented upwards and downwards such that base is moved rearwards and upwards when crossbeam passes from lowered position to raised position |
FR2910398A3 (en) * | 2006-12-21 | 2008-06-27 | Renault Sas | Motor vehicle seat, has base connected to floor along platform with driving unit driving backrest with respect to base, where driving unit includes rod with toothed wheel that is fixed to another toothed wheel of rotational axis |
CN102973032A (en) * | 2011-09-02 | 2013-03-20 | 王凯旋 | Lift-type exercise machine with no need for electric energy |
US20150076309A1 (en) * | 2012-05-07 | 2015-03-19 | Johnson Controls Technology Company | Seat adjustment device for vertical adjustment of a vehicle seat |
US9511687B2 (en) * | 2012-05-07 | 2016-12-06 | Johnson Controls Technology Company | Seat adjustment device for vertical adjustment of a vehicle seat |
US9511688B2 (en) | 2012-05-07 | 2016-12-06 | Johnson Controls Technology Company | Seating part of a vehicle seat |
US9573492B2 (en) | 2012-05-07 | 2017-02-21 | Johnson Controls Technolgy Company | Vehicle seat |
US9630530B2 (en) | 2012-05-07 | 2017-04-25 | Johnson Controls Technology Company | Longitudinal adjuster for a vehicle seat |
US9637030B2 (en) | 2012-05-07 | 2017-05-02 | Johnson Controls Technology Company | Vehicle seat with a lumbar support |
Also Published As
Publication number | Publication date |
---|---|
JP4032827B2 (en) | 2008-01-16 |
JP2003341393A (en) | 2003-12-03 |
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