The Double “J” Hook Ratchet Tie Down Strap ratchet wheel is widely used in bicycle flywheels and wrenches because of its one-way transmission capability. Most of the existing ratchet wheels have only one working state, that is, either counterclockwise transmission or clockwise transmission. However, if both conditions are required, the usual ratchets are difficult to handle for bidirectional symmetrical bicycles and stunt bicycles. 200520061793.4 shows a way of using two sets of ratchets to install in opposite directions. One of the disadvantages is that there are many manufacturing processes. First, two opposite ratchets must be made, and then the shafts and screws are used to connect; the other is the inconvenient conversion. , Need to use tools such as a wrench. However, the special ratchet wheels for various wrenches have high resistance when not transmitting force, and cannot be converted during rotation. It is inconvenient to use on the bicycle flywheel. It provides an integrated, compact structure and can quickly complete the forward and reverse conversion during rotation. Two-way ratchet. In order to achieve the above-mentioned purpose, the technical solution adopted by the present utility model includes a driving ring, a driven ring, a wire stopper, a pawl, a ratchet, a spring, a control head and a control ring, which is characterized in that the driven ring is nested inside the driving ring It is coaxial with the driving ring.

The wire block is screwed on the side of the driven ring. There are balls between the driving ring, the driven ring and the wire block. The control ring is coaxial with the driving ring, the driven ring and the wire block. The ratchet is engraved on the driving ring. On the inner surface of the ring, the pawl is installed in a groove on the outer surface of the driven ring, and the control head is fixed on the side of the control ring and passes through the opening on the side of the driven ring to contact with two springs. The pawls are symmetrical in shape, with a T-shape as a whole, with a rotating shaft in the middle and a pawl on each side. The pawl is also engraved with two grooves with the same shape but opposite angles. The bottom surface of these grooves is clamped with the symmetry axis of the pawl. angle. The ratchet teeth are symmetrical trapezoid, with large outside and small inside. The outer wall of the driven ring is engraved with two identical circular grooves coaxial with the driven ring, and the two grooves are coplanar with the two grooves on the pawl.

The spring is installed in the groove on the driven ring and the groove on the pawl. Its shape is C-shaped, with elbows at both ends. The specific shape of the elbow is a semicircular hook that is folded outward or inward. , And fold out a section vertically to the side. The spring is installed in the groove on the driven ring and the two grooves on the pawl, and its shape is 0-shaped. [0010] The steering head is wedge-shaped, and there are two sets of grooves and grooves at different distances from the top of the wedge, and each set of two grooves are distributed on the two slopes of the wedge and are symmetrical about the symmetry axis of the wedge. The control head is V-shaped with a groove at each end. The spring is C-shaped, the control head is wedge-shaped, and its slope is installed in the direction perpendicular to the radial direction of the driven ring.

The elbow of the spring can be hung on the groove and groove of the control head, and can follow the slope of the control head. The face slides from one set of grooves and grooves to the other. The spring is O-shaped, the control head is V-shaped, and its slope is installed in the radial direction of the driven ring, and the spring can slide back and forth between the slots. The advantage of this utility model is [0014] Because the symmetrical pawl of this utility model can rotate clockwise and counterclockwise under the action of two springs and grasp the ratchet teeth, it can selectively move forward and backward. Transfer force in one of the two opposite directions. The operating head can slide along the axial direction of the ratchet with the operating ring, thereby controlling the size or shape of the two springs, and then controlling the deflection direction of the pawl. Since the sliding direction of the control ring is perpendicular to the rotation direction of the ratchet wheel, the two do not interfere with each other, so the switching of the working state can be quickly completed during the rotation of the ratchet wheel.