JPH0525057U - Rotation mechanism of handle - Google Patents

Abstract

(57) [Abstract] [Purpose] Allows smooth rotation of the handle by reducing play of the handle with respect to the support. [Structure] A shaft 5 of a handle portion is formed with a step portion 5a projecting from the bottom surface 4a of a holder bracket 4 by a very small amount, and a ball retainer plate 9 holding a ball 10, a collar 11, and a first portion on the step portion 5a. After sequentially assembling the pressing plate 8a, the coil spring 7, and the second pressing plate 8b, the nut 6
By integrally fixing the ball pressing plate 9 to the shaft 5 via the collar 11, only the first pressing plate 8a moves up and down in cooperation with the pressing force of the coil spring 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a handle rotating mechanism used for a grip portion of a hand megaphone or the like.

[0002]

[Prior Art]

 For example, the grip part of a hand megaphone is rotatably attached to the main body, and the grip part is bent toward the main body during storage, which is considered to make the device compact.

This type of hand megaphone is configured as shown in FIGS. 4 and 5, for example. That is, in the hand megaphone 1, the handle portion 3 is extended and rotatably attached to the connection portion 2a that is slanted and hung down in the direction of the horn 1a at the bottom of the main body portion 2 that emits sound. Then, by rotating the handle portion 3 as shown, the handle portion 3 is expanded and extended as shown in FIG. 4, and is rotated 180 degrees, so that the handle portion 3 becomes parallel to the main body portion 2 side as shown in FIG. It can be folded and stored, which contributes to compactness. In order to carry out such a storage mode, generally, the rotating shaft P of the handle portion is assembled to the connecting portion 2a with a predetermined angle inclined with respect to its extension axis.

FIG. 6 shows a conventional mounting structure of the handle portion 3 and the connecting portion 2a. A cylindrical holder bracket 4 is provided in the connecting portion 2a covered by the cover, and a shaft 5 serving as a rotating shaft of the handle portion 3 is inserted from a bottom surface 4a thereof through an insertion hole 4c. A nut 6 is screwed and fixed to the tip of the shaft 5, and a coil spring 7, a washer 8 and a ball pressing plate 9 are sequentially inserted between the nut 6 and the bottom surface 4a of the holder bracket 4. A pair of steel balls (balls) 10, 10 are rotatably arranged at positions corresponding to 180 degrees inside the ball pressing plate 9, and the steel balls 10 are formed on the bottom surface 4 a of the holder bracket 4. The handle portion can take two positions (modes) by being fitted in and disengaged from the hole 4b.

When the handle portion 3 is to be displaced from the use state of FIG. 4 to the stored state of FIG. 5, the ball pressing plate 9 rotates integrally with the rotation of the handle portion 3 around the shaft 5. , The steel ball 10 escapes from the ball hole 4b formed on the bottom surface 4a of the holder bracket 4 while raising the washer 8 against the pressing force of the coil spring 7 and into another ball hole 4b corresponding to 180 degrees. It becomes possible to fall into two aspects.

[0006]

[Problems to be solved by the device]

 By the way, in the above-described rotating mechanism of the handle portion, the holder bracket 4 and the handle portion 3 (shaft 5) that rotate relative to each other allow the insertion / removal operation of the steel ball 10 with respect to the ball hole 4b. Since the position of the coil spring 7 is elastically regulated and connected in the axial direction through the pressing force of the coil spring 7, there is always an elastic play in the axial direction by the amount of bending of the spring (the connecting portion 2a and the handle portion 3). Occurs, which causes play during rotation of the handheld part 3 and adds fatigue to the spring due to use over time, which hinders smooth rotation, as well as play during rotation operation. Due to this, foreign matter such as sand may enter the gap and wear or damage both parts. Further, since the steel balls 10, 10 are arranged corresponding to 180 degrees, the washer 8 pressed by the coil spring 7 tilts on the steel ball as shown in the drawing, and the ball pressing plate 9 is the spring of the coil spring 7 by this tilting. Part of the force will act directly. Therefore, due to the direct contact between the ball pressing plate 9 and the bottom surface of the holder bracket 4, this becomes a sliding resistance at the time of rotation and the rotational force of the handle portion 3 becomes large, resulting in poor operability. There are also some points, which necessitate selection of expensive materials for both sliding members.

By the way, in order to reduce the elastic play in the axial direction as much as possible, it is considered that the spring force of the coil spring should be increased, but this force directly acts on the ball and the ball pressing plate 9. As a result, the frictional force of the rotating part becomes so large that the intended purpose for the smooth operation of the click mechanism cannot be met.

[0008]

[Means for Solving the Problems]

 The present invention has been made to solve the above-mentioned problems, and is a rotation mechanism of a handle part supported by a support part, which has a pair of ball holes on the bottom surface and is integrally provided on the support part. A ball having a holder bracket attached to it, a stepped portion of the shaft of the handle portion having a screw engraved at one end from the bottom surface, and the ball is held on the stepped portion at a position corresponding to the ball hole. Place the pressing plate, fix the first pressing plate to the shaft with the nut on the ball pressing plate via the collar, and insert the second pressing plate mounted on the ball into the collar. The present invention also provides a rotation mechanism of a handle portion, which elastically presses the coil spring to allow the support portion to rotate in a click manner.

[0009]

【Example】

 FIG. 1 is a vertical sectional side view of an essential part of the present invention, FIG. 2 is a bottom view of a holder bracket, and FIG. 3 is a view showing a relationship between the holder bracket, a shaft, and a collar. In the present proposal, the same components as those shown above are designated by the same reference numerals, and the detailed description thereof will be omitted.

As shown in the drawings, the shaft 5 is similarly inserted into the insertion hole 4c formed in the bottom surface 4a of the holder bracket 4, and the fitting portion of the shaft 5 is the holder bracket 4 A step portion 5a having a size T slightly larger than the plate thickness t of the bottom surface 4a of the above is formed to project. This projection amount is sufficient if the bottom surface of the ball pressing plate 9 and the bottom surface 4a of the holder bracket 4 do not simply contact each other, so that a small gap of, for example, about 0.15 to 0.3 mm is sufficient.

Then, a disk-shaped ball pressing plate 9 that comes into contact with the stepped portion 5a of the inserted shaft 5 is fitted into the screw portion 5c, and the steel ball 10 and the collar 11 are fitted and then The washer 8a serving as the first pressing plate and the coil spring 7 are fitted and inserted into the rail 11, and the washer 8b serving as the second pressing plate and the spring washer 12 are successively fitted into the threaded portion of the shaft, and finally the nut 6 is fitted. By tightening by tightening, the washer 8a is elastically allowed to move up and down along the collar 11. The ball retainer plate 9 holding the steel balls 10 is securely fixed to the shaft 5 so that there is almost no gap in the axial direction. With this assembly, there is no surface contact between the ball retainer plate 9 and the holder bracket 4. The pressing force of the coil spring 7 is not received at all.

Further, even if the handle portion 3 is forcibly displaced in the axial direction, the ball pressing plate 9 contacts the bottom surface 4a of the holder bracket 4 and functions as a stopper. It doesn't bend.

Then, when the handle portion 3 is rotationally displaced to bring the handle portion 3 into the state shown in FIGS. 4 and 5, the handle portion rotation mechanism configured as described above is connected to the connection portion 2a serving as a support portion. By rotating the handle portion 3 by 180 degrees in a predetermined direction, the rotational force is generated by moving the steel balls 10, 10 from the first position through the ball hole 4b to the second position corresponding to 180 degrees. Done. In the course of this movement, even if a pressing force acts on the surface of the ball pressing plate 9 by the washer 8a inclined as shown in FIG. 1 due to the spring force, the ball pressing plate 9 and the bottom surface 4a of the holder bracket 4 are not separated from each other. Since a certain minute gap is always ensured, there is no sliding friction, and the rotating operation force is only the rolling friction force of the steel ball, so the operation is performed smoothly and the durability is also greatly improved.

Needless to say, by forming a chamfer on the peripheral edge of the ball hole 4b, the ball can be easily inserted and removed, and the ball hole 4b is hardened with an appropriate hardness. By doing so, the durability is further improved.

[0015]

[Effect of the device]

 As described above, according to the mechanism of the present invention, there is no surface contact between the ball retainer plate that holds the ball that rotates integrally with the shaft that is the handle and the support such as the holder bracket that rotates relative to the handle. Rotation is allowed, and the axial displacement of the support part when the handle is attached can be set to a very small value at the time of assembly, and the support part and the rotating part do not change over time. Durability is improved without any gaps between them.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of essential parts showing an embodiment of a rotating mechanism of a handle part of the present invention.

FIG. 2 is a bottom view of a holder bracket.

FIG. 3 is a vertical cross-sectional side view illustrating details of a rotation mechanism of a handle portion according to the present invention.

FIG. 4 is an explanatory diagram of a hand megaphone that employs a rotating mechanism of a handle portion.

FIG. 5 is an explanatory diagram of a hand megaphone that employs a rotating mechanism of a handle portion.

FIG. 6 is a vertical sectional side view showing a conventional rotating mechanism of a handle portion.

[Explanation of symbols]

1 ... Hand megaphone, 2 ... Main body part, 3 ... Handle part, 4
... Holder bracket, 5 ... Shaft, 6 ... Nut, 7 ...
Coil springs, 8a, 8b ... Washers, 9 ... Ball pressing plate.

Claims (1)

[Scope of utility model registration request] 1. A rotation mechanism for a handle portion supported by a support portion, comprising a holder bracket integrally provided on the support portion, the holder bracket having a pair of ball holes on the bottom surface, and one end from the bottom surface. A step portion of the shaft of the handle portion having a screw engraved is slightly projected, and a ball holding plate holding a ball at a position corresponding to the ball hole is placed on the step portion, and the ball holding plate is placed on the ball holding plate. The first pressing plate is fixed to the shaft with a nut via a collar, and the second pressing plate placed on the ball is elastically pressed by a coil spring fitted in the collar, and the handle portion is provided. A rotation mechanism of a handle portion, wherein the support portion is allowed to rotate by clicking.