Seat belt buckle and its return spring

Abstract

A seat belt buckle includes a buckle base, which is a flat box-shaped body with an insertion port, a chamber, and a belt threading hole sequentially formed along the insertion direction. Spring sleeves are respectively provided on both sides of the chamber in a direction perpendicular to the insertion direction. Two limit buttons are accommodated on both sides of the chamber. Each limit button is rotatably pivotally connected to the buckle base via a pivot portion and has a lever extending out of the insertion port and a buckle arm extending away from the insertion port. A sliding belt pressing rod is movably provided at the belt threading hole, with two end rods extending into the buckle base at both ends. A return spring loop is sleeved on the spring sleeve. Each loop is connected to a first spring arm abutting against the buckle arm and a second spring arm abutting against the end rod. Through the mutual restraint of the first and second spring arms, the twisting or swaying of the return spring when compressed is reduced, improving the smoothness of the operation of the limit buttons and the sliding belt pressing rod, as well as the return stability.

Claims

1. A seatbelt buckle, comprising: A fastener, a flat-shaped housing, defines an insertion direction. Along this insertion direction, a socket, a chamber, and a strap hole are sequentially formed on the fastener. A spring-loaded rod is provided on each side of the fastener in a direction perpendicular to the insertion direction. The two spring-loaded rods are located on both sides of the chamber in the direction perpendicular to the insertion direction. Two limiting buttons are housed in the chamber on both sides perpendicular to the insertion direction and located between the two spring-loaded rods. Each limiting button has a pivot portion, which is rotatably pivotally connected to the fastener. A lever and a fastening arm are connected to each pivot portion. Each lever extends out of the socket, and each fastening arm extends from the corresponding pivot portion in a direction away from the socket. A sliding pressure bar is movably disposed on the buckle seat along the insertion direction, and includes a bar body and two end bars respectively connected to both ends of the bar body. The bar body is at least partially located in the thread hole, and the two end bars respectively extend into the buckle seat. Two return springs are also provided, each including a ring and a first spring arm and a second spring arm respectively connected to the ring. Each ring is sleeved on a corresponding spring bar, the outer end of each first spring arm abuts against a corresponding buckle arm, and the outer end of each second spring arm abuts against a corresponding end bar.

2. The seat belt buckle as described in claim 1, wherein each of the return springs is integrally bent and wound from the same spring steel wire, each of the first spring arms extends in a direction perpendicular to the insertion direction, and each of the second spring arms extends in a direction parallel to the insertion direction.

3. The seat belt buckle as described in claim 1, wherein each buckle arm forms a first spring groove on the side facing the corresponding spring sleeve; the outer end of each first spring arm extends into the corresponding first spring groove.

4. The seatbelt buckle as described in claim 1, wherein each of the end rods forms a second spring groove on the side facing the corresponding spring sleeve rod; the outer end of each of the second spring arms extends into the corresponding second spring groove.

5. The seat belt buckle as claimed in claim 1, wherein the buckle includes a first half-shell and a second half-shell, the buckle being riveted together by the first half-shell and the second half-shell; the buckle has a connecting portion formed on both sides of the belt hole in a direction perpendicular to the insertion direction, the two connecting portions respectively connecting the belt hole and the interior of the buckle, and the two end rods respectively extending into the buckle through the two connecting portions.

6. The seat belt buckle as described in claim 5, wherein the first half-shell forms a first opening, the second half-shell forms a second opening, and the first opening and the second opening together form the belt hole; the rod body forms a first protrusion and a second protrusion on both sides facing the first opening and the second opening, respectively, the first protrusion extending into the first opening and the second protrusion extending into the second opening.

7. The seatbelt buckle as described in claim 5, wherein the first half-shell has two first shaft holes, and the second half-shell has two second shaft holes corresponding to the two first shaft holes; two pivot rivets are provided in conjunction with the two first shaft holes, each pivot rivet passing through the corresponding first shaft hole and the corresponding second shaft hole, and each pivot rivet includes a head, a shaft, and a riveting rod connected in sequence; each head abuts against the outer periphery of the corresponding first shaft hole, each shaft passes through the chamber on a corresponding side in a direction perpendicular to the insertion direction, each riveting rod passes out of the corresponding second shaft hole and forms a riveting portion at its outer end, each riveting portion abuts against the outer periphery of the corresponding second shaft hole; each pivot portion forms a pivot hole, and each pivot hole is rotatably fitted onto the corresponding shaft.

8. The seatbelt buckle as described in claim 7, wherein the second half-shell is connected to a ring at the inner periphery of each of the second shaft holes, and each ring protrudes toward the chamber; the outer diameter of the shaft of each pivot rivet is the same as the outer diameter of the corresponding ring, and the outer diameter of the rivet rod of each pivot rivet is smaller than the outer diameter of the corresponding shaft, such that each pivot rivet forms an annular shoulder between the shaft and the rivet rod, each annular shoulder abuts against the end of the corresponding ring facing the shaft, and the outer peripheral surface of each shaft is flush with the outer peripheral surface of the corresponding ring; each pivot hole is rotatably fitted onto the corresponding shaft and the corresponding ring.

9. A return spring for a seatbelt buckle, comprising a ring, a first spring arm, and a second spring arm, wherein the first spring arm and the second spring arm are respectively connected to the ring.

10. The return spring of the seat belt buckle as claimed in claim 9, wherein the return spring is integrally bent and wound from the same spring steel wire, and the direction of extension of the first spring arm is perpendicular to the direction of extension of the second spring arm.

Images