JPS6084409A - Mechanism for holding rod or pipe having cylindrical outer surface - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for holding a rod or tube having a cylindrical outer surface.

As an example in which a mechanism for holding a rod-shaped object having a cylindrical outer surface is adopted, as shown in FIGS. 1 to 3,
The structure of the attachment of a bicycle handlebar to the handlebar stem is important.

As shown in Fig. 1, this structure basically consists of a cylindrical inner surface with a slightly larger diameter than the outer diameter of the central part of the handlebar C to be held at the tip of the forward protruding rod of the handlebar stem a. d
and a notch f that is reducible by a screw means e.
After inserting the handlebar C into the annular part of the clamp part g, the notch part f is reduced by the screw means e, and the clamp part g is closed. When the inner diameter is forcibly reduced, the handlebar C is tightened by the clamp part g.
is kept fixed.

As shown in Fig. 2, the above-mentioned clamp part g has a pair of opposing walls forming a cutout part f, one of which is provided with a positive internal thread n, and the other part j is provided with a bolt insertion hole k. By screwing the port m inserted through the bolt insertion hole k into the female thread n, the distance between the opposing wall 3, that is, the gap between the notch f, is reduced. By the way, the female thread n and the bolt insertion hole have a second
As shown in the figure, for reasons of processing equipment or to facilitate processing, it is necessary to provide the clamp parts g so that they have the same axis when in their natural state. For this reason, as shown in FIG. 3, when the handlebar C is fixed and held by reducing the notch f, the axis of the female screw n and the bolt insertion hole, which were on the same axis in the natural state, is There is a problem in that the bolts intersect at a certain angle, and as a result, the bolt m bends during tightening or during the tightened state. This means that most of the torque for tightening bolt m is
This means that it takes more force than is originally necessary to tighten bolt m all the way to the end.
The fact that m is bent means that more force than necessary is required to loosen this bolt m. Also,
It is even more difficult to reuse the bolt m once bent. Furthermore, in this conventional structure, the clamp part g, which has an inner diameter larger than the outer diameter of the cylindrical handlebar C to be tightened in its natural state, is reduced to about the outer diameter of the handlebar C. Since the handlebar C is fixed and held in a forcibly elastically deformed state, the tightening force with the bolt m is the same as the handlebar C.
When tightening, in addition to the force for the original purpose of holding the bolt, it is necessary to bear the force for elastically reducing the inner diameter of the clamp part g, and therefore, this also increases the torque for tightening the bolt m. is required more than originally necessary, and the bolt m also needs to be thick. For this reason, this type of holding structure, which has been common in the past, requires extremely large torque to tighten the screw means beyond what is originally necessary, which is extremely difficult. It was.

The present invention was conceived under the above circumstances, and its purpose is to firmly hold a rod or tube having a cylindrical outer surface with extremely small tightening torque;
In addition, the purpose of tightening is to provide a new holding structure that prevents the screw from bending in the tightening state.

In order to achieve such an objective, the present invention takes the following technical measures.

In other words, the notch is provided in the annular clamp part having a cylindrical inner surface, and when the cylindrical inner surface is tightened in its natural state, the outer diameter of the object (tightening is limited to the object having a circular cross section). (although the term outer diameter is used here for convenience) and an inner diameter (used as a term corresponding to the outer diameter above), A screw hole is formed in one side of the opposing wall which is extended from the other side so as to have the same axis, and the screw inserted through the screw hole is screwed into the screw hole; , a flange portion is provided at an intermediate portion of the screw located between the opposing walls.

When the interval between the notches is increased, the inner diameter of the cylindrical inner surface of the clamp is increased, and when the interval between the notches is decreased, the inner diameter is decreased. The clamp part of the present invention has an inner diameter that is approximately the same as the outer diameter of the cylindrical object to be tightened in its natural state, but is expanded once by turning the screw in the loosening direction. The cylindrical object is inserted, and then the screw is turned in the tightening direction to reduce the inner diameter and tighten the cylindrical object. Turn the above screw in the direction of loosening.
A flange formed at the intermediate portion functions to abut against the inner side surface of one of the pair of opposing walls and to push these opposing walls apart from each other. On the other hand, when the screw is turned in the tightening direction, the head of the screw comes into contact with the outer surface of the opposing walls, functioning to bring these opposing walls closer together. That is, in the present invention, the inner diameter of the clamp part is forcibly and elastically expanded to allow the object to pass through, and the object is returned to its natural state, that is, the inner surface of the clamp is in close contact with the outer surface of the object. Therefore, the original tightening method is performed using screws. The inner diameter of the clamp part of the present invention in its natural state is almost the same as the outer diameter of the object when tightened, so even if the screw is tightened, the inner diameter of the clamp only slightly decreases and hardly changes. Therefore, almost all of the torque for tightening the screw is converted into force for holding the outer surface of the cylindrical object in the tightened shape. Therefore, the torque that must be applied to the screw in order to securely hold the object is significantly smaller than in the case of a clamp with a conventional structure. Furthermore, since there is almost no change in the inner diameter of the clamp portion between the natural state and the tightened state, there is no possibility that the screw, that is, the bolt, will bend midway in the tightened state as in the conventional case.

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings from FIG. 4 onwards.

As shown in FIG. 4, this example is similar to the conventional example shown in FIGS.
This is an example of a case where the center portion of the handlebar 4 is held by the clamp portion 3 provided at the tip portion of the handlebar 4.

As clearly shown in Figure 5, this clamp gB 3
has an annular shape with a cylindrical inner surface 5, and a notch 6 is formed in a part of the ring.

When the interval between the notches 6 is forcibly widened, the clamp section 3 is elastically deformed so that the inner diameter of its cylindrical inner surface 5 is expanded, and conversely, when this interval is forcibly reduced, the inner diameter of the cylindrical inner surface 5 is deforms elastically so that it shrinks. In the present invention, when the clamp portion 3 is in its natural state, the inner diameter of its cylindrical inner surface is made to be approximately the same as the outer diameter d of the central portion of the bundle bar 4, which is the object to be held.

A pair of opposing walls 7° 8 are integrally formed in the notch 6 and are opposed in parallel across the gap between the notches 6, one of which has a screw hole 9 and the other 7 has a screw insertion hole. 10
are opened so that they have the same axis. The threaded portion 11b of the bolt 11 inserted through the screw insertion hole 10 is screwed into the screw hole 9, and the retaining ring 13 is fixedly fitted into the annular groove 12 provided in the intermediate shaft portion of the bolt. This forms a collar 14 located between the opposing walls 7.8.

Next, a method of fixing and holding the handlebar using the clamp section of this embodiment will be explained.

FIG. 5 shows a state in which the bolt 11 is not tightened, so the collar 14 is located in the middle of the gap between the pair of opposing walls 7.8, and the clamp part 3 is in its natural state, that is, in its natural state. The inner diameter is the outer diameter d of the handle y<-4
is almost the same.

In this state, the handlebar 4 cannot be passed through the clamp portion 3. To pass the handlebar through the clamp section, do the following.

First, from the state shown by the solid line in FIG. 5, the bolt 11 is loosened, ie, if the bolt 11 has a right-hand thread, it is rotated counterclockwise.

Then, this bolt 11 tries to come out from the opposing wall 8 in which the screw hole 9 is made in the right direction in FIG.

Since the intermediate shaft portion of this bolt 11 is formed with a flange 14 that cannot pass through the screw insertion groove 10 of the opposing wall 7, at this time, this flange portion 14 comes into contact with the inner surface of the opposing wall 7. This wall 7 is pressed to the right in FIG. 5 in contact with each other, thereby forcibly expanding the distance between the opposing walls 7.8 as shown by imaginary lines in FIG. When the distance between the opposing walls is expanded in this manner, the clamp portion 3 is elastically deformed so that its inner diameter is expanded, and only then can the handlebar 4 be passed through the clamp portion. After passing the handlebar through the handlebar, when the bolt 11 is tightened, that is, rotated clockwise, the clamping part 3 returns to its natural state as shown by the solid line in FIG. Close to the outside of the par 4. The reason for this close contact is that the inner diameter of the cylindrical inner surface 5 of the present invention in its natural state is set to be approximately the same as the outer diameter of the handlebar 4. Therefore, if the inner diameter of this cylindrical inner surface 5 is made slightly smaller than the outer diameter of the handlebar, when the clamp part 3 returns to its natural state as described above, its own elastic force will temporarily hold the bundle bar. Since it can be held, subsequent tightening is convenient for smooth work. Note that, due to its own elasticity, the clamp part 3 attempts to return from the deformed state shown by the imaginary line in FIG. 5 to the natural state shown by the solid line, so the force required to turn the bolt 11 at this time is extremely small. . Next, as shown in Figure 6, bolt 1
1 is further turned in the tightening direction to apply a tightening force, the contact pressure between the inner surface 5 of the clamp part 3 and the outer surface of the bundle bar increases, and the resulting frictional force is applied to the axis of the handlebar 4. Effectively prevents simultaneous movement or rotation.

Conversely, in order to remove the handlebar 4 from the clamp part 3, the bolt 11 is rotated in the loosening direction to widen the inner diameter of the clamp part 3, and the bundle bar is removed from the clamp part 3.

FIG. 7 shows another embodiment of the invention.

In this example, the collar 14 is formed by a nut 15 screwed onto the middle portion of the bolt 11.

That is, in this case, as shown in FIG.
and the threaded portion 17 of the bolt 11 to which the nut 15 is to be tightened are threaded in opposite directions, then the bolt 11 is turned in the direction of loosening and the nut is brought into contact with the inner surface of the opposing wall 7, so that the nut is in contact with the inner surface of the opposing wall 7. When increasing the distance between the opposing walls 7 and 8,
This is convenient because the NAND 15 does not come loose.

In this way, in the present invention, the inner diameter of the annular clamp part is
It is determined to be approximately the same as the outer diameter of the cylindrical object to be fixed,
Once the clamp part is elastically deformed so that its inner diameter expands and the object is passed through the clamp part, the inner surface of the clamp part returns to its natural state and is in close contact with the outer surface of the object.
Since tightening with a screw is configured to apply torque for the first time, all of the torque applied to the screw can be converted into force with which the inner surface of the clamp portion presses the outer surface of the object to be held. For this reason, the tightening of the bolt is extremely small compared to conventional clamps of this type, which have to bear the force of elastically deforming the clamp part due to torque and the force of deforming the bolt. The cylindrical object to be held can be securely held with the tightening torque. Moreover, with the present invention, the inner diameter of the clamp when it is fully tightened and held is almost the same as the inner diameter in its natural state, so there is no problem in that the shaft of the bolt bends during tightening, unlike in the past. do not have.

It goes without saying that the scope of the present invention is not limited to the embodiments shown in the drawings.

That is, the illustrated example shows an example in which the present invention is applied to a clamp part of a handle stem for fixing and holding a handlebar, but the present invention is not limited to this, and a rod or a pipe having a cylindrical outer surface can be used with a split part. Needless to say, the present invention can be applied to all cases in which the annular clamp is used to securely hold the device. Further, although the illustrated example shows a holding object having a circular cross section as an example of a holding object having a cylindrical outer surface, the present invention may also be applied to a structure for holding a rod or tube having a polygonal shape such as a quadrilateral cross section. can be applied.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a conventional example, FIGS. 2 and 3 are sectional views showing main parts of the conventional example, and FIGS. 4 to 6 are
One embodiment of the present invention is shown, FIG. 4 is an overall perspective view, and FIG. 5 is an overall perspective view.
The figure and FIG. 6 are for explaining the action of the
FIG. 7, which corresponds to the cross section taken along line -V, is a sectional view showing another embodiment of the present invention. 3... Clamp part, 6... Notch part, 7, 8...
・Opposing wall, 9...Screw hole, 10...Screw insertion hole, 1
1... Screw (bolt), 14... Tsuba Applicant Maeda Kogyo Co., Ltd. Agent Patent Attorney Toyoharu Higuchi and 2 others Figure 1 a t\ Figure 7

Claims (1)

[Claims] (11) A notch is provided in the annular clamp portion having a cylindrical inner surface, and the cylindrical inner surface is formed to have an inner diameter that is approximately the same as the outer diameter of the object when tightened in its natural state. A pair of opposing walls are provided integrally extending from the clamp so as to sandwich the parts between them, and a screw hole is formed in one of the walls, and a screw insertion hole is formed in the other side so as to have the same axis, and a screw inserted through the screw insertion hole is provided. The screw is screwed into the screw hole, and a flange is provided at an intermediate portion of the screw located between the pair of opposing walls.
A mechanism for holding a rod or tube with a cylindrical outer surface.