FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION
A conventional squeeze loop is disclosed in FIG. 1 and generally includes a composite material such as glass fiber made plate which is bent to be a loop 10′ and two holding grips 30 are connected diametrically to the loop 10′. The plate extends through holding first grip 30 on the left of FIG. 1 and the two ends are positioned in the other holding grip on the right by two bolts. As shown in FIG. 2-1, the plate is a straight plate which is bent to be the loop so that there is a pre-stress in the plate before it is squeezed. As shown in FIG. 2-2, when squeezing the loop 10′ at two points “P” and “H” inward, the two points “A” and “O” are deformed at a large scale so that the two points “A” and “O” are suffered by a large stress and could crack. When the two points “P” and “H” are pulled outward, the two ends secured by bolts could split from the holding grips 30 and hurt the user. Besides, during transportation of the loops, if the temperature reaches the transfer point of the glass fiber, the glass fiber could be cracked.
The present invention intends to provide a squeeze loop and a method for making the same, wherein the loop is made by wrapping yarn soaked by resin to a mandrel such that there has no pre-stress and is a seamless loop and the loop bears larger stress when being squeezed.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a method for making a squeeze loop and the method comprises the following steps:
step 1: preparing yarns soaked with resin and wrapping the yarns to a mandrel;
step 2: solidifying the yarns and removing the mandrel from the yarns which forms a tube;
step 3: cutting the tube into loops, and
step 4: wrapping the loops with an outer layer made of flexible material.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a conventional squeeze loop;
FIG. 2-1 shows points on the conventional squeeze loop;
FIG. 2-2 shows when the conventional squeeze loop is squeezed by “F”, the two points “A” and “O” are deformed;
FIG. 3 is a cross sectional view to show the squeeze loop of the present invention;
FIG. 4 is a perspective view to show the squeeze loop of the present invention;
FIG. 4-1 is a cross sectional view to show the squeeze loop of the present invention;
FIG. 5 is a flow chart of the method of the present invention;
FIG. 6 shows yarns are wrapped around a mandrel;
FIG. 6-1 shows the two parts of the mandrel is separated and removed from the solidified yarns;
FIG. 6-2 shows the tube formed by the solidified yarns is cut into loops;
FIG. 6-3 shows the loop cut from the tube;
FIG. 6-4 shows that each loop includes an inner layer and an outer layer;
FIG. 7 shows the points where force may be applied thereto on the loop of the present invention;
FIG. 7-1 shows the two points “P″” and “H′” of the loop of the present invention are squeezed by inward forces;
FIG. 8 shows the relationship of deformation and the stress on the points of the loop of the present invention when the loop is squeezed;
FIG. 9 shows pre-stress “F” applied to the conventional loop;
FIG. 9-1 shows the force “F′” squeezes the conventional loop and the points “A” and “B” are applied by “F+F′”, and
FIG. 10 shows the relationship of deformation and the stress on the points of the conventional loop when the conventional loop is squeezed.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIGS. 3, 4 and 4-1, the squeeze loop of the present invention comprises an inner layer 10 made of yarns 5 such as mixture of glass fiber or carbon fiber composite material and high elastic material, merged in thermo-plastic or thermo-setting resin 6 and an outer layer 20. The outer layer 20 is made of flexible material such as foam material, plastic or rubber. The inner layer 10 of the loop is formed integrally without pre-stress and seams. The outer layer 20 may be made to have desired shape such as a wave-shaped and colors. Two holding grips 15 are integrally formed with the inner layer 10 and the outer layer 20 is coated to the holding grips 15.
FIGS. 5, 6, 6-1, and 6-2 show the method for making the squeeze loop of the present invention and the method comprises the following steps:
step 1: preparing yarns 5 soaked with resin 6 and wrapping the yarns 5 to a mandrel 7;
The yarns 5 are a mixture of glass fiber or carbon fiber composite material and high elastic material. The resin 6 is thermo-plastic or thermo-setting resin.
step 2: solidifying the yarns 5 and removing the mandrel 7 from the yarns 5 which forms a tube 50;
step 3: cutting tube 50 into loops 100 with desired width, and
step 4: wrapping the loops 100 with an outer layer 20 made of flexible material such as foam material.
The mandrel 7 includes a first part 71 and a second part 72. The first part 71 has a first tubular section 712 and a first flange 711 on a first end of the first tubular section 712. The second part 72 has a second tubular section 722 and a second flange 721 on a first end of the second tubular section 722. The first section 712 is removably inserted in the second tubular section 722, such that when the wrapped yarns 5 is solidified, the two parts 71, 72 are separated from each other so as to have the tube 50. FIGS. 6-3 and 6-4 show the composition of the loop 100.
Referring to FIGS. 7 and 7-1, because the loop 100 of the present invention is formed by the solidified yarns 5 so that no pre-stress is applied to the loop 100 and the loop 100 has no seams. When the loop 100 is squeezed by two forces “F′” in opposite directions at points “P′” and “H” as shown, the two points “A′” and “B′” are deformed and bears the force “F′”. Referring to FIG. 8, the curve of the relationship between the deformation of all the points A′ to O′ is a smooth concave curve.
Referring to FIGS. 9, 9-1 and 10, the conventional loop is made by bending the plate into a loop, so that a pre-stress F is existed in every point in the conventional loop. When two forces F′ squeeze the conventional loop, the points “A” and “B” are suffered by the sum of the forces “F” and “F′”. Therefore, the conventional loop tends to crack.
While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.
Patent Application
20050019570
