JPS581102Y2 - Handlebar fixing device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a fixing device that includes a cylindrical holding part provided at the tip of a protruding part of a handle stem and fixes a handlebar to the holding part.

Normally, a bicycle has a stem body that extends in the vertical direction, with a protrusion integrally formed from the top to one side, a handlebar being fixed to the tip of the protrusion, and the stem body being freely supported by the head pipe. Attach it to the front hawk,
By operating the handlebar, the front fork and the front wheel are rotated via the handle stem.

Conventionally, in order to fix the handlebar to the handle stem, a cylindrical holding part is integrally formed on the protruding part of the handle stem, a part of the outer circumference of this holding part is split, and a collar piece is attached to the end edge of the holding part. The bar is integrally formed, and by inserting the bar into the holding part and screwing bolts between the flanges of the holding part, the holding part is compressed and the handle bar is fixed.

As another fixing means, a housing chamber that opens into the cylindrical holding part is formed in the protruding part of the handle stem, and a pressing body of the handlebar and a movable body for moving the pressing body are provided in the housing chamber. is inserted into the holding part, and the movable body is moved by a bolt inserted from the outside of the protruding part, and a handle bar is inserted into the holding part,
There is a handlebar in which the handlebar is fixed by pressing the bar into the holding part by performing a pushing operation by a movable body in conjunction with the rotational operation of the bolt.

However, since each of the above-mentioned fixing means has a collar piece or a bolt protruding outward from the handle stem, the rod 1 does not look like the rod 1 in appearance.
However, there is a problem that it is difficult to rotate the bolt.

By the way, a fixing device intended to solve the above problem has already been proposed as shown in Japanese Utility Model Application Laid-Open No. 54-180555.

To roughly explain this,...a bar holding part provided at the tip of the protruding part of the handle stem is provided with a freely movable nut-shaped suppressor with an internal thread that extends inward in the radial direction of the holding part. The protrusion is hollow, and the protrusion is provided with an operating body that is screwed into the internal thread of the suppressor.

However, since the suppressing body integrates the pressure contact part to the handlebar and the threaded part to the operating body, not only can the materials used for both not be selected separately, but also the material for the operating body and the bar holding part cannot be selected separately. Due to the eccentric axis of the handlebar, there is a problem in that the handlebar is prone to wobbling, and the suppressor is complicated and large as a whole, making it difficult to apply and load. It is necessary to install a handlebar stem, which requires a lot of man-hours and creates a problem with the appearance of the handlebar stem.
There is a problem in that it is not possible to quickly fix the handlebar and stably maintain the fixed state without increasing the amount of operation.

However, the purpose of this invention is to
The handlebar can be fixed quickly and reliably, and this fixed state can be stably maintained, and the manufacturing and assembly of parts as a whole can be simplified, and the handlebar can be attached with a good appearance. This is what I did.

That is, the present invention provides a bar holding part at the tip of a protruding part of a handle stem, and is a fixing device for fixing a handlebar to the holding part, wherein the protruding part is provided with a threaded through hole, and one end of the bar holding part is provided at the tip of the protruding part of the handle stem. is opened at the inner circumferential surface of the bar holding portion, and the other end is opened at the top of the handle stem, and a suppressor that engages with the handlebar and a screw body are provided separately, and the suppressor is supported freely only in the axial direction at one end side of the through hole in the protrusion, and the screw body is connected to the pressing body so as not to rotate relative to the pressing body with a slight gap therebetween. On the other hand, an operation tube having a first screw screwed into the screw in the protrusion and a second screw screwed into the screw body is provided, and the operation tube is inserted into the through hole of the protrusion. and the screw body is screwed into the operating barrel, and by rotating the operating barrel, the suppressing body is moved through the threaded body through 1 to the bar holding portion. It is characterized in that it moves inward in the radial direction to fix the handle bar.

Next, details of the present invention will be explained with reference to the embodiments of the drawings.

In the figure, reference numeral 1 designates a handle stem to which the fixing device of the present invention is applied, in which a protrusion 3 is integrally extended from the top of a stem body 2 extending in the vertical direction toward the -side. A cylindrical bar holding portion 4 is integrally provided at the tip of the bar.

The inside of the stem body 2 has a through hole 5 penetrating from the top to the bottom end, and the protrusion 3 has one end opening to the inner surface of the holding part 4 and the other end opening to the inside of the stem body 2. Through holes 6 opening on the side surfaces are respectively formed.

Further, at the top of the stem body 2, each of the through holes 5,
A cap 8 is fitted over the opening 7 formed by the intersecting holes 6 to prevent rainwater from entering the image quality holes 5 and 6.

The lower portion of the stem body 2 of the handle stem 1 is fixed to the front wheel by a front fork using known fixing means.

Reference numeral 9 in the figure represents a handlebar that is inserted into and fixed to the holding portion 4 of the handle stem 1.

Therefore, in the present invention, in the above structure, the handlebar 9 is fixed to the holding part 4 of the handle stem 1 in the following manner.

That is, the inner peripheral surface of the holding portion 4 of the stem 1 and the approximately semicircular portion located on the through hole 6 side has a cross section of approximately 3.
Punctures are made in a sun-moon shape to form a housing chamber 11 for the suppressor 10 described below.

The suppressor 10 is slightly smaller than the accommodation chamber 11, has a crescent-shaped cross section with an arc surface having approximately the same curvature as the handlebar 9, and has a protrusion 12 protruding from the center of its back side. At the same time, a through hole 13 is provided in the center of the suppressing body 10, passing through the pressing body 10 and the protrusion 12, and the through hole 1
3 is formed as a small-diameter through hole 13a on the side of the projection 12, and this suppressor 10 is accommodated in the accommodation chamber 11 so as to be freely movable.

14 is a screw body attached to the pressing body 10, which has a flange 15 with a larger diameter than the small diameter through hole 13a of the protrusion 12 in the suppressing body 10, and a screw 16 is screwed on one side of this flange 15. A shaft portion 17 is formed on the other side.

Then, the shaft portion 17 of the screw body 14 is inserted into the through hole 13 from the small diameter through hole 13a of the suppressing body 10, and the insertion end of the shaft portion 17 is provided with a retainer having a diameter larger than the small diameter through hole 13a. The ring 18 is fitted and the screw body 14 is attached to the pressing body 10.

The screw body 14 is attached to the suppressing body 10 so as not to rotate following the operating cylinder described below. That is, as shown in FIG. The small diameter passage 13a of the body 10 is made to have the same shape as the shaft portion 17 to prevent the screw body 14 from following rotation.

Incidentally, the shaft portion 17 of the screw body 14 and the small diameter passage 13a of the pressing body 10 may have an elliptical or square cross section to prevent the screw body 14 from following rotation.

On the holding part 4 side of the through hole 6 in the protruding part 3,
An internal thread 19 is formed.

Reference numeral 20 denotes an operating cylinder, which has a first screw 21 on its outer periphery that engages with the internal thread 19 of the protrusion 3, and a second screw 22 that engages with the thread 16 of the threaded body 14 on its inner periphery. At the outer end of the operation tube 20, the operation tube 20 is formed.
A hexagonal operation hole 23 is provided for rotationally operating the.

This operation tube 20 has its second screw 22 screwed into the screw 16 of the screw body 14, and the screw 21 is inserted into the protrusion 3.
The second screw 22 of the operating body 20 is screwed into the internal thread 19 of the operating body 20, and the operating barrel 20 is rotated to move the screw 21 along the internal thread 19 of the protrusion 3.
The handlebar 9 is pressed into the holding part 4 by moving the threaded body 14 screwed into the holding part 4 and pushing the pressing body 10 by using the flange 15 of the threaded body 14. This is done in order to fix it.

However, as described above, the first screw 2 is attached to the outer periphery of the operating body 20.
1 is provided, the first screw 21 and the screw 16 of the screw body 14 are formed in the same direction, and the screw 16 of the screw body 14 is set at a pitch angle of 1.5 mm with respect to the first screw 21 of the operation barrel 20. A single differential screw is used, and the amount of movement of the screw body 14 screwed into the second screw 22 is greater than the amount of movement of the operation tube 20 accompanying the rotational operation of the operation tube 20, This is done so that the screw body 14 is moved toward the holding portion 4 by the rotation of the operation barrel 20.

At this time, each screw 21.1 of the operating barrel 20 and the screw body 14
6 may be a reverse thread so that the threaded body 14 can be moved toward the holding part 4 by the operation tube 20.

In the figure, 24 is a retaining nut fitted to the outer end of the inner screw 19 buttoned on the protrusion 3, and 25 is a washer fitted to the inner side of the nut 24.

In the above configuration, when fixing the handle par 9 to the holding part 4 of the handle stem 1, the handle par 9 is first inserted into the holding part 4, and then the protruding part is inserted through the opening 7 of the stem 1. A tool such as a wrench is inserted into the operating hole 23 of the operating barrel 20 through the through hole 6 of No. 3, and the operating barrel 20 is rotated using the tool.

Then, the operating barrel 20 moves while being screwed along the inner thread 19 of the protrusion 3, and as a result of this rotating operation, the screw body 14 screwed into the second screw 22 of the operating barrel 20 moves into the holding barrel. 4 side, the flange 15 of the threaded body 14 presses the suppressing body 10 against the handlebar 9, and the bar 9 is fixed to the holding part 4.

In addition, when releasing the rigidity of the handle par 9, the operation tube 20 is rotated in the opposite direction to that in the above case, and the screw body 14 is moved backward, thereby moving the suppressor 10 toward the accommodation chamber 11. The pressing force of the pressing body 10 against the handle bar 9 is released, and the bar 9 can be removed from the holding part 4.

As explained above, according to the fixing device of the present invention...
Since the suppressor that engages with the turndle bar and the screw body are provided separately, not only can they be easily machined without interfering with each other, but also the optimum material can be selected for each of them.For example, as a suppressor... A hardenable material that can be firmly and stably pressed against the body without loosening, and as a screw body,
When manufacturing by cutting, a free-cutting material can be selected, and both the manufacturability of the part and the functionality of the fixing can be improved.

Furthermore, since the suppressing body and the screw body are provided separately, they can be easily assembled into the protruding part of the handle stem without the need to provide a special hole for assembly, and the machining of the protruding part can be simplified. In addition, since there are no holes for assembly, there is no accumulation of dirt and the appearance is good.

Moreover, since the suppressing body and the screw body are connected with each other so that they cannot rotate relative to each other with a small gap between them, they are connected by moving relative to each other only outside the gap in a direction perpendicular to the direction of suppressing the handlebar. Therefore, even if the axis of the through hole and the axis of the handlebar in the holding part are misaligned, this misalignment can be easily corrected by the relative movement and connection of the suppressor and screw body. Therefore, the handlebar can always be accurately fixed by the suppressor.

Also, since the first screw of the operation tube is screwed into the through-hole screw and the second screw is screwed into the screw body, when the operation tube is rotated, this operation causes the screw body to screw in the direction of the pressing body. The advancing speed of the screw body is the sum of both the screw speed of the operation tube and the relative speed of the screw body with respect to the operation tube, and the speed of the screw body is the sum of the screw speed of the operation tube and the relative speed of the screw body with respect to the operation tube. By individually selecting the thread pitch and thread direction specifications for the two screws, the speed of the screw body by operating the operation tube can be adjusted as desired.

Therefore, the above-mentioned 1. By forcing the second screw to move the operating tube and screw body in the same direction at a dog pitch,
The speed of the screw body can be extremely increased, and the fixing of the handlebar to the bar holding portion by the suppressing body can be released extremely quickly.

In addition, by making the first screw with an extremely small pitch and the second screw with a dog pitch so that the operation tube and the screw body are screwed in the same direction, the screw body can be moved without increasing the amount of operation of the operation tube. Not only can a sufficient amount of screw movement in the direction of the pressing body be ensured, but also after the handlebar is fixed, the operation cylinder... has a locking function by pressing the small pitch threaded parts against each other in the through hole of the handlebar stem. This allows the handlebar to be securely and stably fixed to the bar holding portion.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal side view of a handle stem equipped with a fixing device of the present invention, and FIG. 2 is an enlarged cross-sectional view of a portion where a screw body and a suppressor are attached. DESCRIPTION OF SYMBOLS 1... Handle stem, 3... Protrusion part, 4... Holding part, 9... Handlebar, 10... Pressing body, 14...screw body,
20... Operation tube.

Claims (1)

[Scope of utility model registration request] A bar holding part is provided at the tip of a protruding part of a handle stem, and the handlebar is fixed to the holding part, the fixing device being provided with a threaded through hole in the protruding part, and one end of which is connected to the bar holding part. A pressing body and a threaded body each having an opening on the inner circumferential surface and the other end opening at the top of the handle stem and engaging with the handlebar are provided so that the suppressing body can be inserted through the protruding portion. The screw body is supported at one end of the hole so as to be freely movable only in the axial direction, and the screw body is connected to the pressing body with a slight gap therebetween so as not to rotate relative to the pressing body. An operation tube having a first screw that is screwed into the screw and a second screw that is screwed into the body of the screw is provided, and the operation tube is inserted into the through hole of the protrusion and attached to the screw. and by screwing the screw body into the operation tube and rotating the operation tube, the pressing body is moved inward in the radial direction of the bar holding part via the screw body. A handlebar fixing device characterized by fixing the handlebar.