JPH064754Y2 - Stopper device for movable pieces for electrical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a stopper device for a movable piece for electrical equipment provided in electrical equipment such as a lumbar support.

[Problems to be Solved by Prior Art and Invention] In general, among these electrical components, for example, a lumbar support for adjusting the lumbar support of a seat backrest is adapted, and the lumbar support is electrically adjusted. There is something. In such a structure, a movable piece whose rotation around the axis is restricted is screwed on a feed screw engraved on an output shaft that is driven and rotated, and the movable piece is moved based on the rotation of the output shaft. Although it is configured to move in the axial direction, it is necessary to install a stopper that restricts further movement when the movable piece reaches the movement limit on the tip side of the output shaft.

Therefore, conventionally, as shown in FIG. 4, a small-diameter portion 4 is formed on the tip side of the output shaft 3, and when the movable piece 5 reaches the movement limit, a stopper 11 with which a damper 7 provided on the movable piece 5 abuts.
Although the stopper 11 is provided, the stopper 11 is integrally fixed and supported by the nut 12 screwed to the screw 4a formed in the small diameter portion 4. For this reason, when the movable piece 5 reaches the movement limit and the damper 7 comes into contact with the stopper 11 in a pressing manner, the stopper 11 is configured such that the damper 7 is made of a rubber elastic material having high sliding resistance. Therefore, the damper 7 tries to rotate together with the damper 7, and as a result, the damper 7 may be forcibly twisted and damaged in an early stage.
It is conceivable that the stopper 11 may loosen due to the rotation of the upper end, and it is necessary to study these improvements.

[Means for Solving the Problems] The present invention has been made in view of the above circumstances, and was devised with the object of providing a stopper device for a movable piece for electrical equipment that can eliminate these drawbacks. A movable piece whose rotation around the shaft center is restricted is screwed onto a feed screw engraved on the output shaft, and the movable piece is moved in the axial direction based on the rotation of the output shaft. Along with
A small diameter portion is formed on the tip of the output shaft, in which a screw for screwing a nut is engraved, and the small diameter portion is provided on the movable piece when the movable piece reaches the movement limit on the tip side of the output shaft. In order to restrict the movement of the movable piece beyond the movement limit by providing a stopper supported by the screwed nut in order to receive the damper in a pressing state, the damper receiving of the stopper is provided in the small diameter portion. It is characterized in that a washer is provided on the surface side so as to be freely rotatable, and a resin material for reducing sliding resistance is coated on a facing sliding surface between the washer and the stopper.

Further, the present invention is capable of preventing unreasonable torsional stress from acting on the damper and surely preventing the nut from loosening due to this configuration.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawing, reference numeral 1 denotes a casing of an electric motor, and an electric motor (not shown) is incorporated in the casing 1, and the rotational driving force of the casing is an output shaft 3 passing through a reduction mechanism 2.
It is configured to be output from the outside. Output shaft 3
The feed screw 3a is engraved on the feed screw 3a.
A movable piece 5 is screwed on the shaft so as to be movable in the axial direction. A base end portion 6a of an adjusting arm 6 pivotally supported by a skeleton 6b on the skeleton side for adjusting the lumbar support is integrally fixed to the outer peripheral surface of the movable piece 5. By the forward and reverse rotation of the output shaft 3 accompanying the motor drive, the movable piece 5 moves in the axial direction with the rotation around the axial center being restricted, and the lumbar support adjustment is performed by the adjusting arm 6. Has become.

A stepped concave portion 5a is formed on both axial side surfaces of the movable piece 5, and a stepped damper groove 5b is further formed on the outer diameter portion of the concave portion 5a. And this damper groove 5
A ring-shaped damper 7 formed of a rubber elastic body is integrally installed in b.

On the other hand, the tip portion of the output shaft 3 is stepped with respect to the feed screw 3a to form a small diameter portion 4, and the small diameter portion 4 is engraved with a screw 4a, but the small diameter portion 7 has a washer. 8 and a stopper 9 are inserted through and fixedly supported integrally by a nut 10. The washer 8 is freely rotatably inserted into the small-diameter portion 4 at a rear side position where the screw 4a is not formed in the small-diameter portion 4, but the washer 8 has a stopper facing surface that slides with the stopper 9. In order to reduce the dynamic (friction) resistance, a suitable resin material 8a such as a fluororesin or a silicone resin is coated, and the movable piece 5 is
When the damper 7 reaches the movable limit and the damper 7 is pressed and received by the stopper 9 via the washer 8, the washer 8 is
It is configured to positively slide and rotate with respect to the stopper 9 to allow co-rotation with the movable piece 5.

In the embodiment of the present invention configured as described above, the adjustment arm 6 is displaced by the movement of the movable piece 5 in the axial direction along with the motor drive as described above, and the lumbar support adjustment is performed. When the bridge 5 reaches the movement limit of the output shaft 3, the damper 7 is pressed by the stopper 9 via the washer 8 to prevent the movement further, but at this time, the washer 8 stops the stopper 9. On the other hand, they are in sliding contact with each other in a state where the sliding resistance is reduced by the resin material 8a. As a result, the washer 8 co-rotates with the damper 7 in an independent state in which the stopper 9 is not accompanied, and the stopper 9 directly slidingly contacting the nut 10 may inadvertently rotate. There is no stopper 9
Therefore, it is possible to reliably prevent the nut 10 that fixes and supports the screw from rotating and loosening.

Moreover, in the movement limit state, the washer 8 directly pressed by the damper 7 positively rotates together with the damper 7 in a state in which the sliding resistance with respect to the stopper 9 is small.
It is also possible to reliably prevent the damper 7 from being damaged due to excessive torsional stress.

The present invention is not limited to the above-mentioned embodiment, and the resin material may be coated on the side of the stopper facing the washer, or on both sides of the washer and the stopper. Is.

[Advantages] In short, since the present invention is configured as described above, the movable piece moves in the axial direction of the movable piece as the output shaft rotates, but the movable piece moves toward the tip side of the output shaft. When the limit is reached, a washer is interposed between the damper that has reached the limit of movement and a stopper that receives it in a pressing manner, and a resin material is placed between the washer and the stopper on the sliding surface. It is coated and has a low sliding resistance.

As a result, the washer is co-rotating with the damper in an independent state without the stopper,
It is possible to reliably prevent the nut that stops the stopper from being accidentally turned and loosened, without the stopper that directly contacts the nut sliding along with it.

Moreover, in the movement limit state, since the washer, which is in direct sliding contact with the damper, is in sliding contact with the stopper with a small sliding resistance, it positively rotates together with the damper, so it is impossible for the damper. Even if the damper is damaged due to a large torsional stress, it can be surely avoided.

[Brief description of drawings]

FIG. 1 shows an embodiment of a stopper device for a movable piece for electrical equipment according to the present invention. FIG. 1 is a front view of a lumbar support adjusting device, and FIG. 2 is a front view of a main part with a movable piece part cut away. FIG. 3 is an enlarged cross-sectional view of the movable piece, and FIG. 4 is a front view of a main part with a movable piece portion cut away showing a conventional example. In the figure, 3 is an output shaft, 3a is a feed screw, 4 is a small diameter portion, 5 is a movable piece, 7 is a damper, 8 is a washer, 8a is a resin material, and 9a is a resin material.
Is a stopper, and 10 is a nut.

Claims (1)

[Scope of utility model registration request] 1. A feed screw, which is engraved on an output shaft that is driven and rotated, is screwed with a movable piece whose rotation around the axis is restricted, and the movable piece is rotated based on the rotation of the output shaft. And a movable portion is formed on the tip end side of the output shaft, in which a screw for mounting a nut is engraved. When it reaches, the stopper provided on the screwed nut for receiving the damper provided on the movable piece in a pressed state is provided to control the movement of the movable piece beyond the movement limit. The small diameter part is provided with a washer which is positioned on the stopper receiving surface side of the stopper and is freely rotatable, and the opposite sliding surface between the washer and the stopper is coated with a resin material that reduces sliding resistance. A movable piece stopper device for electrical equipment.