Granted Patent B2

US 12,233,768 · App. 17/834,371 · Granted Feb 25, 2025

Inventors: Makoto Kondo (Yokohama, JP); Syunsuke Ochiai (Yokohama, JP)

Assignee: MITSUI KINZOKU ACT CORPORATION

B60N2/919B60N2/2245B60N2/2258B60N2002/952

Abstract

Claims (30)

1. A vehicle seat locking device comprising:

a striker fixed to either a vehicle body or a seat back;

a baseplate fixed to the other of the vehicle body and the seat back and provided with a striker entering groove in which a leg portion provided on the striker is capable of advancing and retreating by operation of the seat back;

a latch which is supported to the baseplate by a latch shaft to be pivotable at a predetermined angle and is pivotable from an unlatching position to a second latching position via a first latching position and vice versa, wherein the latch comprises an engaging groove capable of engaging with the leg portion entered into the striker entering groove, a first arm portion provided at a latching direction side of the engaging groove, a second arm portion provided at an unlatching direction side of the engaging groove, and a third arm portion provided between the engaging groove and the second arm portion;

a ratchet which is supported to the baseplate by a ratchet shaft to be pivotable at a predetermined angle, is biased in an engaging direction by a spring and is provided with a restraining portion engaging with the first and second arm portions to be capable of restraining the latch in the first and the second latching positions respectively; and

an engagement auxiliary lever which is supported to the baseplate by a shaft to be pivotable at a predetermined angle and is provided with first and second auxiliary arm portions, wherein the first auxiliary arm portion is capable of abutting with the leg portion entered into the striker entering groove and the second auxiliary arm portion pivots from a standby position to a restraining position by the abutment of the leg portion with the first auxiliary arm portion and is capable of abutting with the latch in the latching direction by the pivoting from the standby position to the restraining position:

wherein the latch is capable of pivoting from the unlatching position to the first latching position by the engagement of the leg portion entered into the striker entering groove with the engaging groove, and is capable of pivoting to the second latching position by the movement of the second auxiliary arm portion accompanied with the pivot of the engagement auxiliary lever to the restraining position,

wherein the engagement auxiliary lever makes the latch pivot to a position before the second latching position by abutment of the second auxiliary arm portion with a pushed portion provided on the latch, and

wherein the leg portion of the striker is made to exit from the engaging groove by the pivot of the latch to the second latching position and is clamped between the engagement auxiliary lever and a tip portion of the third arm portion.

2. The vehicle seat locking device according to claim 1 , wherein the engagement auxiliary lever stops in the restraining position by abutment of the first auxiliary arm portion with the baseplate.

3. The vehicle seat locking device according to claim 2 , wherein respective abutting portions on the first auxiliary arm portion of the engagement auxiliary lever with the leg portion of the striker and the baseplate are formed with a synthetic resin or an elastic material.

4. The vehicle seat locking device according to claim 1 , wherein the engaging groove of the latch is positioned to overlap with the striker entering groove when the latch is positioned between the unlatching position and the position before the second latching position, and is made to retreat to a position where the engaging groove of the latch is not overlapped with the striker entering groove when the latch is positioned in the second latching position.

5. The vehicle seat locking device according to claim 1 , wherein the ratchet has a cam portion, which abuts with the second arm portion of the latch by a biasing force of the spring and makes the latch pivot forcibly from the position before the second latching position to the second latching position.

6. The vehicle seat locking device according to claim 5 , wherein the ratchet comprises a first ratchet supported by the ratchet shaft to be pivotable at a predetermined angle and a second ratchet supported by the ratchet shaft to be pivotable at a predetermined angle independently from the first ratchet, wherein the first ratchet has an engaging portion, which engages with the first arm portion to prevent the latch from pivoting from the first latching position in the unlatching direction and engages with the second arm portion to prevent the latch from pivoting from the second latching position in the unlatching direction, and wherein the second ratchet has a hooking portion engaging with the first arm portion to prevent the latch from pivoting from the first latching position in the latching direction.

7. The vehicle seat locking device according to claim 6 , wherein the cam portion of the ratchet is continuously formed from the engaging portion of the first ratchet.

8. The vehicle seat locking device according to claim 1 , wherein an opening width of the striker entering groove is more than twofold of thickness of the leg portion of the striker.

9. A vehicle seat locking device comprising:

a striker fixed to either a vehicle body or a seat back and provided with a first leg portion and a second leg portion apart from the first leg portion with a predetermined distance;

a baseplate fixed to the other of the vehicle body and the seat back and provided with a striker entering groove in which the first and second leg portions are capable of advancing and retreating by operation of the seat back;

a latch which is supported to the baseplate by a latch shaft to be pivotable at a predetermined angle and is pivotable from an unlatching position to a second latching position via a first latching position and vice versa, wherein the latch comprises an engaging groove capable of engaging with the first leg portion entered into the striker entering groove, a first arm portion provided at a latching direction side of the engaging groove, a second arm portion provided at an unlatching direction side of the engaging groove, a third arm portion provided between the engaging groove and the second arm portion, and a pushed portion with which the second leg portion entered into the striker entering groove is capable of abutting;

a ratchet which is supported to the baseplate by a ratchet shaft to be pivotable at a predetermined angle, is biased in an engaging direction by a spring and is provided with a restraining portion engaging with the first and second arm portions to be capable of restraining the latch in the first and the second latching positions respectively; and

a stopper infixed to an inner portion of the striker entering groove in the baseplate:

wherein the latch is capable of pivoting from the unlatching position to the first latching position by the engagement of the first leg portion entered into the striker entering groove with the engaging groove, and is capable of pivoting to the second latching position by the abutment of the second leg portion entered into the striker entering groove with the pushed portion, and

wherein the first leg portion of the striker is made to exit from the engaging groove by the pivot of the latch to the second latching position and is clamped between the stopper and a tip portion of the third arm portion.

10. The vehicle seat locking device according to claim 9 , wherein the engaging groove of the latch is positioned to overlap with the striker entering groove when the latch is positioned between the unlatching position and the position before the second latching position, and is made to retreat to a position where the engaging groove of the latch is not overlapped with the striker entering groove when the latch is positioned in the second latching position.

11. The vehicle seat locking device according to claim 9 , wherein the ratchet has a cam portion, which abuts with the second arm portion of the latch by a biasing force of the spring and makes the latch pivot forcibly from the position before the second latching position to the second latching position.

12. The vehicle seat locking device according to claim 11 , wherein the ratchet comprises a first ratchet supported by the ratchet shaft to be pivotable at a predetermined angle and a second ratchet supported by the ratchet shaft to be pivotable at a predetermined angle independently from the first ratchet, wherein the first ratchet has an engaging portion, which engages with the first arm portion to prevent the latch from pivoting from the first latching position in the unlatching direction and engages with the second arm portion to prevent the latch from pivoting from the second latching position in the unlatching direction, and wherein the second ratchet has a hooking portion engaging with the first arm portion to prevent the latch from pivoting from the first latching position in the latching direction.

13. The vehicle seat locking device according to claim 12 , wherein the cam portion of the ratchet is continuously formed from the engaging portion of the first ratchet.

14. The vehicle seat locking device according to claim 9 , wherein the stopper is formed with a synthetic resin or an elastic material.

15. The vehicle seat locking device according to claim 9 , wherein an opening width of the striker entering groove is more than twofold of each thickness of the first and second leg portions of the striker.

Assignments (2)

Priority Claims (2)

Continuity (1)

References Cited (23)