DETAILED DESCRIPTION OF THE INVENTION

[0011] Referring to FIG. 1 and FIG. 2, the structural arrangement of the invention herein, the present invention is comprised of a restraining base 1, a latch plate 2 hinged onto the restraining base 1, a cramp block 3 fitted into the two sides at the bottom end of the latch plate 2, and a torque spring 4 installed under preloaded tension between the restraining base 1 and the latch plate 2, of which:

[0012] The said restraining base 1 is punch formed from a single sheet of iron plate into a U-shaped substructural body having an opening 11 though the bottom end and, furthermore, the said opening 11 provides for rope insertion; teeth-shaped arresting blocks 12 are disposed along a side of the said restraining base 1 opening 11 and, furthermore, each arresting block 12 is one-way enmeshing tooth consisting of a curved slanted face 121 at one end and a perpendicular face 122 at the other end, thereby allowing an inserted rope S to only slide in a single direction; a pivot hole 13 is formed in each of the two ends of the restraining base 1 that provides for the insertion of a pin P to conjoin the latch plate 2 and the restraining base 1 into a unitary hinged body.

[0013] The said latch plate 2 is punch formed from a single sheet of iron plate into a planar structure that is contoured slightly downward from the upper front end and, furthermore, with a lateral portion 21 extending outward along each of its two sides that facilitates the fitting in and placement of the cramp block 3; a pivot hole 22 is formed in each of the two ends of the latch plate 2 lateral portions 21 to provide for the insertion of a pin P and, furthermore, a slot 23 is formed at each of the bottom ends of the pivot holes 22 to provide for the snapped insertion of a matching tenon 33 at each of the two sides of the cramp block 3.

[0014] The said cramp block 3 is punch formed from a single sheet of iron plate into a rectangular solid structure arrayed with enmeshing teeth-shaped projections each having a curved slanted face 32 at one end and a perpendicular face at the other end, thereby providing for the sliding of the rope S in a single direction; a tenon 33 extends along each of the two sides of the said cramp block 3 and, furthermore, the tenons 33 are inserted into the slots 23 of the latch plate 2 and then the slightly stretched lateral portions 21 of the latch plate 2 draw back together to position the cramp block 3 onto the latch plate 2 such that it is carried along as the latch plate 2 is rotated.

[0015] Referring to FIG. 3 and FIG. 4, after the cramp block 3 tenons 33 have been inserted into the said latch plate 2 slots 33, the two lateral portions 21 of the latch plate 2 rebound inward to ensure that the cramp block 3 remains clipped and restricted into position on the latch plate 2 and, furthermore, the teeth faces of the cramp block 3 engage the arresting blocks 12 on the restraining base 1; then, the latch plate 2 pivot holes 22 are aligned with restraining base 1 pivot holes 13 and, as the pin P is about to be inserted, the torque spring 4 is installed and, furthermore, one extremity of the said torque spring 4 is situated against the bottom edge of the latch plate 2 and the other extremity is situated against the top of the restraining base 1 such that the torque spring 4 is tightly postured between the restraining base 1 and the latch plate 2.

[0016] Pressing the far end of the latch plate 2 causes a certain degree of separation to occur between the cramp block 3 teeth faces and the restraining base 1 arresting blocks 12, the rope S is then inserted into the resulting space of separation and drawn out through the opening 11; releasing the latch plate 3 subjects the latch plate 3 to the decompressive exertion of the torque spring 4, causing the cramp block 3 teeth faces to engage the restraining base 1 arresting blocks 12; as such, when the said rope buckle is in the normal state, the upper edge of the latch plate 2 is parallel to the upper edge of the restraining plate 1 and, furthermore, the cramp block 3 fitted into position at the bottom end of the latch plate 2 has its teeth faces engaged against the arresting blocks 12 on the restraining base 1 by the preloaded tension of the torque spring 4 to clutch the rope S inserted between them (as shown in FIG. 3).

[0017] To adjust the length of the rope 2, downward force is applied to the far end of the latch plate 2 and at the same time, the torque spring 4 deforms, causing the front end of the latch plate 2 to move upward at the axial center of the pin P and disengage the teeth faces of the cramp block 3 installed at the bottom edge of the latch plate 2 from the restraining base 1, thereby facilitating the adjustment of the rope S (as shown in FIG. 4); following the release of force application, the latch plate 2 returns to a parallel disposition by the preloaded tension of the torque spring 4, thereby resuming the engaged state.

[0018] Since the said restraining base 1, latch plate 2, and cramp block 3 are each punch formed from a single sheet of iron plate and, furthermore, solid material for the conjoinment section is minimized because the cramp block 3 and the latch plate 3 are both individually punch formed, production cost is reduced; in addition, the one-piece punch formed construction not only provides for fabrication simplicity, but also rapid production and shaping.

[0019] The said cramp block 3 teeth faces and the restraining base 1 arresting blocks 12 each consists of a perpendicular face at one end and a curved slanted face at the other end, a structural feature that enables one-way teeth enmeshment when the restraining base 1 and the cramp block 3 are in an engaged state; as such, when rope S tightness is insufficient while tied to an object, the free end S1 of the rope S can be pulled in a single direction for adjustment and while the rope S is being pulled, the curved slanted face 121 of the arresting blocks 12 do not clutch the rope 2 (the perpendicular faces 122 clutch the rope S) and, furthermore, the rope S is capable of elevating the latch plate 2 an appropriate degree to achieve a single-sided adjustment of the rope S and thereby further increase rope tightness to correct looseness; therefore, when the rope S is tied around cargo, the free end S1 can be pulled to adjust the degree of tightness to prevent the hazardous slippage of the tied cargo.