TW562903B - Connection of tubular composite structural parts having clamp area configuration to prevent cracking under clamping stress - Google Patents

Abstract

A connection of tubular structural part made of composite material such as carbon strand reinforced epoxy resin including one part provided with an elongated recessed or flat clamp side area along the outer surface of the tubular part to avoid cracking of the part when the part is telescopically engaged with and clamped in an outer tube part. The recessed or flat clamp side area of the inner tube prevents contact between the facing edges of an elongate split in the outer tube which are drawn together during clamping so that the edges of the outer tube are prevented from coming into contact with and thus gouging the outer surface of the composite tube causing cracks and eventual structural failure of the inner tube.

Description

iJL background and scope of the invention. The present invention relates to high-performance bicycles ^. ^ t early birth, and the pieces must be made, more specifically, to avoid or reduce the size of the tubular components due to pinch 0 ^ Λ waiting Rupture caused by internal stress. 2. Know-how. Good cycling effects should be gray. 5 The frame and other components of the bicycle must be framed and light and lightweight. As everyone knows, the tubular bicycle bone belongs to t :, seat pillars and other components of the bicycle and other :: can be made of metal or delta gold such as steel, Ming and ', or can be reinforced and cured by high-strength composites such as carbon fiber or glass fiber. Made of resin. In ―, the metal pipe may have a compound outer lavatory i at 2 meters and the outer layer of the mouth combined with it. Made of composite materials

The f-shaped structure is particularly easy to buckle due to the pinch, because it is found that a tube (such as a bicycle seat pillar, a handlebar or a handlebar) is tightly compressed with a C-shaped cooler. I external officials will quickly destroy the structural integrity of the composite through I excavation, abrasion, and point loads. One way to solve this problem is to use a double hinged fixture such as a double hinge pin fixture for a bicycle handlebar. OBJECTS OF THE INVENTION The purpose of the present invention is to propose a tubular joint of a high-strength and lightweight tubular composite structural element, in which the occurrence of cracking caused by the clamping pressure of the telescopic clamping element is greatly reduced. SUMMARY OF THE INVENTION The binding piece includes: a)-an inner tube composed of a composite material, the inner tube has a convex appearance -4- This paper size applies to China National Standard (CNS) A4 specifications (210X297 mm) 562903 A7 B7

V. Description of the invention (2 sides; b)-an outer tube having a concave inner surface that telescopically engages the outer surface of the inner tube, the outer tube has a slit to provide facing edges, and the edges move together during clamping ; And c) an outer tube clamp, the composite inner tube having a clamping side region recessed from the convex outer surface and located at a clearance diameter between the facing edges of the composite tube and the outer tube Orientation so that the facing edges do not engage the clamping side regions of the inner tube during clamping of the clamp. Simple illustration of the diagram A partial side elevation view of the bicycle frame, a seat post sleeve is clamped in the frame. FIG. 2 is a top plan view of a substantially C-shaped clip, frame and seat post sleeve. Excavation Figure 3 is similar to Figure 2, and it is enlarged to show the traditional role of the seat pillar sleeve. Figure 4 is an end view of a seat post sleeve constructed in accordance with the present invention. FIG. 5 is a side view of the seat post sleeve of FIG. 4. Main component generation 10 Outer tube 12 Rip 20 Inner tube 21, 23 Layer of inner tube 22, 24 Clamping side area 5-

The paper size is suitable for HX 297mm) 562903 —--- ~ --- A7, __B7 V. Description of the invention (3) — ^ ^-30 Mounting head 40 C-shaped clamp 42 > 44 Ear piece 46 Tie 200 Examples of conventional bicycle seat pillars. Although the present invention is widely applicable to joints that are held together by an outer tube clamp, such as a c-clamp, < evening telescopic joint pipe fittings, for convenience, the present invention is particularly A bicycle seat pillar or sleeve and a bicycle frame containing the sleeve are described as follows. As shown! The outer tube 1 () (which contains the components of the footwall car frame) is telescopically received as an inner tube of a bicycle seat pillar 20 ′. The inner diameter of the inner tube is similar to the outer diameter of the seat pillar. Provides a tight sliding fit. The outer tube H) (which may be made of metal or composite material or a combination of both) has a longitudinally extending slit 12 to allow the facing edges of the 1G slit of the outer tube to be pulled in by the clip. The inner tube 20 (as a bicycle seat pillar) has a seat mounting head 30 on its upper end. The seat mounting head can be connected to the inner f2G by any conventional technique. The inner tube 2G is completely made of _ composite materials such as carbon fiber reinforced% oxygen Resin composition 'or it may include a multilayer tube-printed & one hundred metal inner reed or one or more composite material outer surface layers 21, 23 (Figure 5). For example, the C-shaped cool '40 has the pair of separated ears & 44 'salt pair of ears, as is known during the clamping process by borrowing-46 to pull together.-There is a threaded tie according to the present invention, to be clamped Together the inner tube 20 of the pair of fittings contains up to -6-

562903

The least one preferably has long, flat clamping side regions 22, 24, respectively, which are on the radially opposite sides of the inner tube 20, respectively. As shown in FIG. 2, the clamping side area 22 for work is positioned next to the slit 12 of the outer tube 10 so that the facing edges of the opposite side of the slit 12 of the outer tube 10 never contact the inner tube 2 which can form a seat pillar Outside surface. Therefore, the clamping side region 22 is positioned in a radial alignment relationship with the gap between the facing edges of the outer tube 10 split 12, so that the facing edge of the split 12 of the outer tube 10 is not clamped with the inner tube 20. The holding region 22 contacts or otherwise engages. The side area 22 is clamped, and its length is selected as an adjustable length that approximates the degree of the bicycle seat (not shown) to be tied to one of the mounting heads 30 (not shown). Although the clamping side region 22'24 shown in the preferred embodiment is a flat surface and the inner tube 20 and the outer tube 10 are round tubes, it is obvious that the clamping side regions 22, 24 are not necessarily flat and the pipe parts 10, 2 It need not be round. The clamping side regions 22, 24 are typically formed during the forming of the composite inner tube 20. As is known in the industry, composite bicycle seat pillars are composed of a plurality of composite layers forming a tubular shape, and these composite layers usually contain reinforcing fiber bundles arranged at different angles to the longitudinal axis of the inner tube 20. Preferably, at least some of the layers 21, 23 of the composite inner tube are made of carbon fiber reinforced epoxy resin. Referring to FIG. 3, there is shown a conventional bicycle seat post 200 which does not have a clamping side region according to the present invention. It can be seen from the figure that the facing edges of the slit 12 of the outer tube 10 are chiseled when tightened on the clamp 40. Dig into the outer surface of the conventional seat pillar 2000. Microscopic inspection of the conventional seat pillar found that Pehuan occurred in this specific area, and the broken ▲ roughly extended the seat pillar longitudinally through the clamping area and then Extend in any direction when the rupture extends in the length direction away from the area of the fixture 40. This discovery has promoted the development of the invention, which provides a better flat -7-This paper size is suitable for financial standards (CNS) A4 specification (21GX 297 Gong) ----- 562903

The side area 22 is clamped to ensure that the faces of the slits 12 are not cut into the outer surface of the composite seat pillar 2000 when they are tightened on the clamp tie 46. Although the seat post can be made to have several slightly different radii, it has been found that a radial distance between the center point of the chord of the clamping side zone 22 and the normal outside diameter of the seat post is about ο ·%. Avoiding or at least reducing rupture and thereby substantially increasing the strength of the inner tube 20 in the above-mentioned area. It is best to provide two diametrically opposite clamping side regions 22, 24 during the molding of the seat pillar to provide symmetry that facilitates the manufacture and assembly of other components to a bicycle seat pillar, such as the mounting head 30. The seat post 200 can be clamped in a manner similar to the seat post being clamped in the outer tube 10. The stress test for various composite seat posts clamped in the outer tube 10 composed of steel, titanium and other materials involves clamping the fixture 40. The threaded tie 46 is sufficiently tightened to cause the seat pillar pipe to rupture. When the seat post pipe without the clamping side area 22 of the present invention is used to tighten the tie 46 at a torque as low as 130 pounds, it is obvious that the pipe fracture or other damage occurs. All tested seat post ruptures occurred at clamping torques not exceeding 200 inch pounds. In contrast, 'the seat post manufactured in accordance with the present invention did not break under the moment when a torque of up to 250 inches was applied to the clamp tie 46. It was therefore found that one of the constructions shown in the figure is provided with a flat or other suitably shaped clamping side area 22 to avoid the facing edge of the slit 12 of the outer tube 10 that houses the seat post and the outer surface of the inner tube 20 sandwiched therein. Some contact between them will significantly reduce the possibility that the inner tube 20 will be unusable due to the excessive torque applied to the clamp tie members 46. As mentioned above, the composite tubular element expected to be clamped in the outer tube can be a mold. 8- This paper size applies Chinese National Standard (CNS) A4 specifications (210X 297 mm) 562903 A7 B7 V. Description of the invention (6) Using an inflatable mandrel, the composite layer of the element is pushed to engage the inner surface of the mold. Those skilled in the art will understand that different modifications of the present invention can be made by the above-mentioned preferred embodiments. The protection scope of the present invention is limited only by the scope of the following patent applications: 0 -9-This paper size applies to the Chinese National Standard (CNS) A4 specification (210 X 297 mm)

Claims (1)

A kind of tubular joint comprising: a) an inner tube composed of a composite material, the inner tube having a convex outer surface; an outer tube having a concave inner surface that telescopically engages the outer surface of the inner tube, The outer tube has a slit to provide facing edges, and the edges move together during clamping; and c) an outer tube clamp, the licking compound inner tube has a clamping side region recessed from the convex outer surface and located at the 舁Where the gap between the facing edges of the crack and the outer tube is radially aligned, the facing edges do not engage the clamping side area of the inner tube during the clamping of the clamp. 2. The joint of claim 1, wherein the clamping side region is substantially flat. 3. If the joint piece of the scope of the application for the patent No. 2, wherein the inner tube contains a bicycle seat pillar sleeve and the outer tube contains a part of a bicycle skeleton, read the clamping side area has a center and the outer diameter of the sleeve They are separated by about 0.50 mm in radial direction. 4. As for the joints in the scope of patent application No. 丨, 2 or 3, it further includes two clamping side regions respectively on the opposite sides of the diameter of the inner tube. 5. As in the above-mentioned application for the joint of item 1, 2, or 3, wherein the inner tube is composed of a plurality of composite layers, the composite layers have reinforcements arranged at different angles to the longitudinal axis of the inner tube Fiber bundle. 6. The joint of claim 5 in which at least one of the composite layers is a carbon fiber reinforced epoxy resin. 562903 A8 B8 C8 D8 The scope of patent application For the joints of item 1, 2 or 3 of the scope of patent application above, the cross section of the inner tube is round except the clamping side area. For example, the above-mentioned application for a joint in the scope of claims 1, 2 or 3, wherein the composite inner tube and its clamping area are formed by molding. For example, the joint of claim 1, 2 or 3, wherein the clamp includes a threaded tie. -2- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)