Seat lifter for motor vehicles
First Claim
Patent Images
1. A seat lifter, comprising:
- first and second frames;
a shaft arranged through a hole formed in one of said first and second frames, said shaft serving to vertically move said second frame with respect to said first frame through a link;
means for defining a predetermined hole in said first frame, said defining means being partly covered with said second frame;
a sector gear engaged with said shaft, said sector gear being formed with a stopper arm which protrudes from one side of said sector gear, said stopper arm having an end engaged with said defining means; and
a center gear supported to said one of first and second frames, said center gear being meshed with said sector gear.
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Abstract
A seat lifter comprises a lifter shaft having a sector gear and rotated by a center gear to vertically move a seat frame with respect to a base frame through a link mechanism. The sector gear is formed with a stopper arm protruding from one side thereof, whereas the base frame is formed with a long arc-shaped hole with which a pointed end of the stopper arm is engaged. The long arc-shaped hole is partly covered by a vertical wall of the second frame.
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Citations
12 Claims
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1. A seat lifter, comprising:
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first and second frames; a shaft arranged through a hole formed in one of said first and second frames, said shaft serving to vertically move said second frame with respect to said first frame through a link; means for defining a predetermined hole in said first frame, said defining means being partly covered with said second frame; a sector gear engaged with said shaft, said sector gear being formed with a stopper arm which protrudes from one side of said sector gear, said stopper arm having an end engaged with said defining means; and a center gear supported to said one of first and second frames, said center gear being meshed with said sector gear. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A lifter for a seat comprising:
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first and second frames; a shaft arranged through a hole formed in one of said first and second frames, said shaft serving to vertically move said second frame with respect to said first frame through a link; a sector gear engaged with said shaft, said sector gear having a tooth portion formed in a special theoretical tooth profile; and a center gear supported to said one of first and second frames, said center gear having a tooth portion formed in a special theoretical tooth profile, said center gear being meshed with said sector gear, wherein the special tooth profiles of the center gear and the sector gear eliminate a need for an assist spring, wherein said sector gear, said center gear, and said link are always biased by a dead weight of said second frame, and wherein the gear ratio of said center gear to said sector gear is 1 to 8-25. - View Dependent Claims (11)
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12. A lifter for a seat comprising:
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first and second frames; a shaft arranged through a hole formed in one of the first and second frames, the hole being arranged to correspond to a front portion of the seat, the shaft serving to vertically move the second frame with respect to the first frame through a link; a sector gear engaged with the shaft, the sector gear having a tooth portion formed in a special theoretical tooth profile; and a center gear supported to the one frame, the center gear having a tooth portion formed in a special theoretical tooth profile, the center gear being meshed with the sector gear, wherein the special tooth profiles of the center gear and the sector gear eliminate a need for an assist spring, wherein the sector gear, the center gear, and the link are always biased by a dead weight of the second frame, and wherein the gear ratio of the center gear to the sector gear is 1 to 8-25.
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Specification