JP4116227B2 - Seat lifter - Google Patents

Description

[0001]
[Field of the Invention]
The present invention relates to a sheet lifter that can be adjusted up and down by being operated with a long operating lever.
[0002]
[Background]
In this type of seat lifter, the operating lever is long, and the load / torque entering the lifter device is also large, so that the operating lever is further up when it is not moved any more Or trying to force it down could damage the device. Also, if the operating lever is inadvertently loaded when getting on or off the vehicle, the seat lifter will be operated without permission. Furthermore, when getting on or getting off at the lowest position, if the operating lever is inadvertently loaded, the device may be damaged. In this case, the occupant is given a foreign object feeling, so-called unpleasant feeling. However, if the operation lever is disposed below, the operability is impaired.
[0003]
[Problems of the Invention]
The object of the present invention is to prevent the lifter device from being damaged when the operation lever is forcibly operated up or down with the seat in the uppermost position or the lowermost position, thereby preventing the passengers from feeling uncomfortable when getting on and off. However, it is in providing a sheet lifter.
[0004]
[Means corresponding to the problem and its operation]
The present invention is divided into a lever main body and a grip, and a U-shaped spring groove is opened at one end side of the lever main body and the base of the grip, and the groove ends of both U-shaped spring grooves face each other. An operation lever that is hinged to each other and assembled at the tip of the lever body and the base of the grip, and is supported by being supported on the output shaft by the lever body, and having a shape that warps in the plate width direction. A ratchet mechanism having an elongate thin leaf spring with its warped side plate face outward and a torque limiter which is suitably wound in a ring shape and strung across the lever body and the U-shaped spring groove of the grip. And the seat is raised to the uppermost position or lowered to the lowermost position, and the operation lever is forcibly operated up or down. When about to be, the torque limiter, flexed the flat spring on a flat and cutting the lever input by providing the operating Slight its grip of the operation lever.
[0005]
[Explanation of specific examples]
Hereinafter, the seat lifter of the present invention will be described based on the specific examples shown and illustrated. FIGS. 1 to 3 show the seat lifter of the present invention which is used for a driver seat of a passenger car. Example 10 is shown in part, and this seat lifter 10 is composed of a lifter body that is normally assembled including a brake shaft 11 and a ratchet mechanism 12, and is incorporated into the driver seat.
[0006]
The ratchet mechanism 12 includes an output shaft 16, a ratchet sector gear (not shown) having a raising side tooth (not shown) and a lowering side tooth (not shown), a feed gear / one-way gear (not shown). ), A neutral spring (not shown), an operating lever 17, a torque limiter 18, and an output shaft 16 and a brake shaft 11 thereof using a casing 13 assembled with a base plate 14 and a drum 15. In the casing 13, the ratchet sector gear, feed gear, and neutral spring are grouped into a unit. More specifically, the output shaft 16 is passed through the casing 13 and is rotatably supported, and the ratchet sector gear is supported on the output shaft 16 while being prevented from rotating on the output shaft 16 in the casing 13. The feed gear is rotatably passed through the casing 13 and supported on one end of the brake shaft 11 in the casing 13 and is supported on the raised teeth of the ratchet sector gear. And the neutral spring is engaged in the casing 13 with its spring end locked to the base plate 14 and the ratchet sector gear to bring the ratchet sector gear into the neutral position. Make it reversible.
[0007]
The operation lever 17 is divided into a lever main body 21 and a grip 22, and U-shaped spring grooves 27 and 28 are opened on one side surface 25 and 26 of the distal end 23 of the lever main body 21 and the root 24 of the grip 22. The U-shaped spring grooves 27, 28 are assembled with the ends 29, 30 of the U-shaped spring grooves 27, 28 facing each other and the tip 23 of the lever body 21 and the root 24 of the grip 22 are hinged together with a wire 33, and The lever body 21 is supported on the output shaft 16 while being prevented from rotating. The lever main body 21 has a shaft hole 32 with serrations opened in the boss 31, and the shaft hole 32 is fitted to the tip 19 with serrations of the output shaft 16 to be prevented from rotating. Further, a bolt 34 is attached to the output shaft 16. It is clamped to prevent it from coming off and is fixedly connected coaxially to the tip 19 of the output shaft 16. Further, the U-shaped spring grooves 27 and 28 are provided with jaws 35 and 36 as shown in FIG. 3 so that the torque limit 18 cannot be jumped out.
[0008]
The torque limiter 18 has an elongated thin plate spring 37 shaped to warp in the plate width direction with its warped side plate surface 38 outward and into the U-shaped spring grooves 27 and 28 of the lever body 21 and the grip 22. The rivet 39 is loosened and stopped by being wound in a plurality of times in a ring shape. The thin leaf spring 37 sets the load / torque that enters the output shaft 16 from the operating lever 17 and prevents overload. The number of lap windings of the thin leaf spring 37 is determined by the spring force according to the set load / torque.
[0009]
In the ratchet mechanism 12 of the seat lifter 10, reference numeral 40 denotes a boss cover.
[0010]
Therefore, when the operation lever 17 is operated upward, the sheet lifter 10 simply raises the driver seat, and when the operation lever 17 is operated downward, the sheet lifter 10 The driver seat is easily lowered, and the seat lifter 10 raises the driver seat to the uppermost position or lowers the driver seat to the lowermost position, that is, in a state where it cannot move any further. When the lever 17 is forcibly operated up or down, the load / torque that enters the output shaft 16 from the operation lever 17 at that time is the torque limiter 18, that is, the thin leaf spring 37 that has been wound multiple times. Since the set load / torque is exceeded, the torque limiter 18 deflects the thin leaf spring 37 flatly. Then, the causes break in the grip 22 of the operation lever 17. Further, when the operation lever 17 is freely placed, the thin plate spring 37 returns to a warped shape, so that the grip 22 of the operation lever 17 is on the extension line of the lever body 21 by the restoring force of the thin plate spring 37. Returned. That is, the grip 22 is restored.
[0011]
As such, the torque limiter 18 flexes the leaf spring 37 flatly and imparts a folding action to the grip 22 and the load / torque entering the lifter body from the operating lever 17, i.e. Cut the lever input. As a result, the device / mechanism is prevented from being damaged in the seat lifter 10, and uncomfortable feeling given to the occupant even when the occupant inadvertently loads the operation lever 17 when getting on and off is prevented. Of course, the operation lever 17 does not need to be provided below the driver seat, and the operability of the operation lever 17 is ensured.
[0012]
As will be apparent from the specific embodiments of the present invention described above with reference to the drawings, for those of ordinary skill in the art to which the present invention pertains, It is easily embodied in another embodiment that derives from the nature and nature of the invention and that is objectively recognized as having them inherent. Of course, the content of this invention corresponds to the problem of the invention (be recommend with) and is essential for the establishment of the invention.
[0013]
[Benefits of the invention]
As understood from the above, the seat lifter of the present invention is divided into a lever main body and a grip, and a U-shaped spring groove is opened on one side of the tip of the lever main body and the base of the grip. The ends of the U-shaped spring grooves face each other and are assembled by being hinged to each other at the tip of the lever body and the base of the grip, and are supported by the lever body so as to be prevented from rotating on the output shaft. An operation lever and an elongated thin leaf spring having a shape that warps in the width direction of the plate, with its warped side plate surface outward, and is appropriately wound in a ring shape across the lever body and the U-shaped spring groove of the grip. In the seat lifter according to the present invention, the seat is lifted to the uppermost position because it includes a ratchet mechanism having a torque limiter that is prevented from being loosened. When the lever is lowered to the lowest position and the operating lever is forced to be operated up or down, the torque limiter deflects the thin leaf spring flat and breaks into the grip of the operating lever. The load / torque that gives movement and enters the lifter body from its operating lever, that is, the lever input is cut by the torque limiter, preventing damage to the device mechanism, and the passenger inadvertently loads the operating lever when getting on and off Even so, discomfort given to the passenger is prevented, and the operation lever is not required to be provided below the seat, so that the operation lever is secured, and as a result, it is very useful and practical for an automobile seat. It is.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a ratchet mechanism in a specific example of a seat lifter of the present invention that is used in a driver seat of a passenger car.
FIG. 2 is a side view showing an operation lever and a torque limiter in a no-load state.
3 is a cross-sectional view taken along line 3-3 in FIG.
[Explanation of symbols]
11 Brake shaft 12 Ratchet mechanism 16 Output shaft 17 Operation lever 18 Torque limiter 21 Lever body 22 Grip 27 U-shaped spring groove 28 U-shaped spring groove 37 Thin plate spring 38 Warp side plate surface

Claims (1)

It is divided into a lever body and a grip. A U-shaped spring groove is opened at one end of the lever body and one side of the base of the grip, and the groove ends of both U-shaped spring grooves face each other so that the lever body An operating lever that is hinged and assembled to each other at the tip and the base of the grip and is supported by being stopped on the output shaft by the lever body, and an elongated thin plate spring having a shape that warps in the plate width direction. A seat provided with a ratchet mechanism having a torque limiter with its warped side plate surface outside and a torque limiter which is appropriately wound in a ring shape and strung over the lever body and the U-shaped spring groove of the grip. Lifter.

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