A seat belt mechanism prevented from locking in the rewind position

Abstract

The invention relates in particular to a seat belt mechanism (1) for use in extending and rewinding a seat belt (21) on a vehicle seat, having at least one body (10), at least one pulley (20) in said body (10) on which a webbing (21) can be wound, and at least one mainspring cassette (30) for continuously rewinding the webbing (21) in connection with said pulley (20) and comprising at least a second locking element (70) for controlling the seat belt mechanism (1) to change position between a released position (I) in which the webbing (21) can move freely and a locked position (II) in which the webbing (21) is prevented from winding.

Description

[0001] A SEAT BELT MECHANISM PREVENTED FROM LOCKING IN THE REWIND POSITION

[0002] TECHNICAL FIELD

[0003] The invention relates in particular to a seat belt mechanism for use in extending and rewinding a seat belt on a vehicle seat, having at least one body, at least one pulley in said body on which a webbing can be wound, and at least one mainspring cassette for continuously rewinding the webbing in connection with said pulley and comprising at least a second locking element for controlling the seat belt mechanism to change position between a released position in which the webbing can move freely and a locked position in which the webbing is prevented from winding.

[0004] PRIOR ART

[0005] Seat belt is a device prepared by automotive manufacturer companies to ensure the safety of passengers in transportation vehicles and used to ensure the safety of people during transportation.

[0006] The seat belt is one of the most important safety equipment in the vehicle and keeps the passengers in the vehicle safe in situations such as sudden braking, dangerous impacts, rollovers and somersaults. However, seat belts, the key to safe driving, come in two- point, three-point and four-point varieties. Baby seats and devices with special recline feature have seat belts with more than 4 points. The importance of seat belts for passenger safety has been indisputably proven by tests.

[0007] In seat belt structures, the webbing extends from a mechanism, wraps around the passenger and is fixed at a second predetermined point. After use, the webbing is released and retracted. The retraction of the webbing is provided by a mainspring. A technical problem encountered with existing seat belt mechanisms is that the seat belt mechanism is locked after the webbing is retracted due to the rapid retraction of the webbing as a result of a hard release. The seat belt mechanism is subjected to vibration due to factors such as the impact of the buckle as a result of the webbing quickly retracting itself, and as a result of this vibration, the seat belt mechanism remains locked as if the limit g-force has been reached.

[0008] Application US2013221 148A1 , known in the literature, relates to a seat seat belt mechanism. Accordingly, there is a set positioned between the lock element and the lock sockets. The purpose of the set is to prevent the seat belt mechanism from locking after rewinding. However, as a result of this embodiment, there are problems with the set coinciding with the end of the lock element. Therefore, the seat belt mechanism locks itself and users again encounter problems with getting stuck.

[0009] As a result, all the problems mentioned above have made it imperative to make a novelty in the relevant technical field.

[0010] SUMMARY OF THE INVENTION

[0011] The present invention relates to a seat belt mechanism for eliminating the disadvantages mentioned above and bringing new advantages to the relevant technical field.

[0012] An object of the invention is to provide a seat belt mechanism which prevents the webbing from locking during retraction.

[0013] A further object of the invention is to provide a seat belt mechanism which operates safely against locking after rewinding.

[0014] In order to achieve all the above-mentioned objects and those that will emerge from the detailed description below, the present invention is particularly a seat belt mechanism for use in extending and rewinding a seat belt on a vehicle seat, having at least one body, at least one pulley in said body on which a webbing can be wound, and at least one mainspring cassette for continuously rewinding the webbing in connection with said pulley and comprising at least a second locking element for controlling the seat belt mechanism to change position between a released position in which the webbing can move freely and a locked position in which the webbing is prevented from winding. The novelty of the invention is that it comprises at least one thread form which serves as a socket for a second lock tongue of the second locking element on said body, first locking element comprises at least a second spring which, in the released position, applies a force so as to pull said second lock tongue towards the center of the opening and away from said thread form, the seat belt mechanism comprises at least one anti-blocking ring, which is connected by leaning against the body, said second locking element is positioned between said anti-blocking ring and the body, it comprises at least one cocoon on the anti-blocking ring, the second locking element comprises at least one pin extending from the second locking element towards the anti-blocking ring to fit into said cocoon, the cocoon comprises at least one second socket into which the second locking element fits into the locking position of the seat belt mechanism, the cocoon comprises at least a third socket into which the pin fits to prevent the seat belt mechanism from moving into the locking position when the webbing is rewound. Thus, due to the friction and inertia between the anti-blocking ring and the body, the seat belt mechanism can change position between released position, locking position and rewind position.

[0015] A possible embodiment of the invention is characterized in that it comprises at least one pressure cover which is connected in such a way that the anti-blocking ring abuts against the body so that the anti-blocking ring rubs against the body during its rotational movement around itself. Thus, the anti-blocking ring allows the transition to the rewind position by rotating less than the gear in the rewinding state.

[0016] Another possible embodiment of the invention is characterized in that it comprises at least one first locking element connected to the gear, it comprises at least one tongue socket formed on said pressure cover such that said first locking element can engage in a first lock tongue, it comprises at least one first spring which applies a force to move said first lock tongue away from said tongue socket. Thus, with two locking mechanisms, position changes between released position, locking position and rewind positions are secured.

[0017] Another possible embodiment of the invention is characterized in that it comprises at least one gear positioned on the body.

[0018] Another possible embodiment of the invention is characterized in that it comprises at least one slot on said gear, anti-blocking ring comprises at least one reclining extension on the face facing the gear configured to change position between a released placement and a locking placement by fitting into said slot, reclining extension in said locking placement is positioned so as to prevent the first locking element from moving outward from the center of the gear.

[0019] Another possible embodiment of the invention is characterized in that the second socket is positioned closer to an outer wall of the anti-blocking ring than the third socket.

[0020] Another possible embodiment of the invention is characterized in that the pressure cover is connected in such a way that the anti-blocking ring is flexed in the range of 0,2-0, 4 mm and pressed against the body. Thus, by means of the friction obtained, the seat belt mechanism can change position between the released position, the locking position and the rewind position.

[0021] BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 shows a representative isometric view of the seat belt mechanism according to the invention.

[0023] Figure 2 shows a representative exploded isometric view of the seat belt mechanism according to the invention.

[0024] Figure 3 shows a representative side view of the body positioned in the seat belt mechanism according to the invention.

[0025] Figure 4 shows a representative isometric view of the second lock tongue in the seat belt mechanism according to the invention.

[0026] Figure 5 shows a representative isometric view of the anti-blocking ring of the seat belt mechanism according to the invention.

[0027] Figure 6 shows a representative side view of the seat belt mechanism according to the invention in the released position.

[0028] Figure 7 shows a representative side view of the seat belt mechanism according to the invention in the released position with the anti-blocking ring detached. Figure 8 shows a representative side view of the seat belt mechanism according to the invention in the locking position.

[0029] Figure 9 shows a representative side view of the seat belt mechanism according to the invention in the locking position with the anti-blocking ring detached.

[0030] Figure 10 shows a representative side view of the seat belt mechanism according to the invention in the rewind position with the anti-blocking ring detached.

[0031] Figure 11 shows a representative side view of the seat belt mechanism according to the invention in the rewind position with the reclining extension in the released placement.

[0032] Figure 12 shows a representative side view of the seat belt mechanism according to the invention in the rewind position with the reclining extension in the locking placement.

[0033] DETAILED DESCRIPTION OF THE INVENTION

[0034] In this detailed description the subject matter of the invention is explained only by way of non-limiting examples for a better understanding of the subject matter.

[0035] Figure 1 shows a representative perspective view of the seat belt mechanism (1 ) according to the invention. Accordingly, the said seat belt mechanism (1 ) is used as safety equipment in vehicle seats. The seat belt mechanism (1 ) has at least one extendable webbing (21 ). Said webbing (21) can be extended from one side of the seat to the other and secured by means of a buckle. In the event of sudden braking and sudden acceleration during the ride, the extension function of the webbing (21 ) is limited by the seat belt mechanism (1 ) to keep the passenger on the seat. In this way, the user is prevented from moving away from the seat due to the inertia principle and unwanted collisions are prevented.

[0036] Figure 2 shows a representative exploded view of the seat belt mechanism (1 ) according to the invention. Accordingly, the seat belt mechanism (1 ) has at least one body (10). Said body (10) can be positioned horizontally or vertically. There are oppositely aligned openings (11 ) in the body (10) and at least one pulley (20) extending between said openings (11 ), on which the webbing (21 ) can be wound. Said pulley (20) is positioned on the body (10) in such a way that it can rotate around itself. By rotating the pulley (20) around itself and by inertia, the webbing (21 ) can be extended out of at least one webbing guide (13) and retracted in the same way. The body (10) has at least one mainspring cassette (30) on which the pulley (20) can be associated from one side. There is at least one mainspring (31) on the said mainspring cassette (30). Said mainspring (31) applies a force in the direction of constant rotation of the pulley (20) around itself, so that the webbing (21 ) is rewound when it is released. The seat belt mechanism (1 ) has at least one housing (32). Said housing (32) is a shell which is formed to at least partially cover the seat belt mechanism (1 ). In this way, the seat belt mechanism (1 ) is protected against external factors that may come from outside.

[0037] Figure 3 shows a representative side view of the body (10) positioned in the seat belt mechanism (1 ) according to the invention. Accordingly, there is at least one opening (11 ) on the body (10). There is at least one thread form (12) on the said opening (11 ). The opening (11 ) substantially comprises a plurality of thread forms (12). At least one gear (40) is positioned on one side of the body (10). At least one first locking element (50) is connected to a face of the gear (40). Said first locking element (50) is positioned such that a first lock tongue (52) portion faces the edge of the gear (40). The first locking element (50) is connected at the other end with at least one first spring (51 ). Said first spring (51 ) is connected to the first locking element (50) at one end and is fixedly connected to the gear (40) body (10) at the other end. With this embodiment, the first locking element (50) is fixed at the end facing the first spring (51 ), while the first lock tongue (52) can move outwards from the center of the gear (40).

[0038] The seat belt mechanism (1 ) has at least one pressure cover (80). Said pressure cover (80) is positioned to enclose the gear (40). There is at least one tongue socket (not shown in the figures) on the inside surface of the pressure cover (80), facing the gear (40). The pressure cover (80) substantially comprises a plurality of tongue sockets. The tongue socket is formed as a conjugate of the first lock tongue (52). Accordingly, the position in which the first lock tongue (52) fits into one of the pluralities of tongue sockets arranged side by side is defined as the locking position (II), and the position in which it does not contact any of the tongue sockets is defined as the released position (I). Figures 6-12 show representative views of the seat belt mechanism (2) in released position (I), locking position (II) and rewind position (III). The first spring (51 ) applies a continuous force to pull the first lock tongue (52) towards the center of the gear (40). In this way, the seat belt mechanism (1 ) remains in its released position (I) under normal operating conditions. When the gear (40) rotates above a certain g-force (preferably 2g), the centrifugal force overcomes the force of the first spring (51 ). As a result, the first lock tongue (52) of the first locking element (50) moves towards the wall of the pressure cover (80) and fits in one of the tongue sockets therein. Thus, the webbing (21 ) is prevented from unwinding in situations such as an accident, which would allow the webbing (21 ) to be quickly unwound from the pulley (20).

[0039] The seat belt mechanism (1 ) according to the invention comprises at least one antiblocking ring (60). Said anti-blocking ring (60) enables the seat belt mechanism (1 ) to have a rewind position (III) in addition to the released position (I) and the locking position (II). Said rewind position (III) is a position in which the webbing (21 ) is prevented from locking after being retracted.

[0040] The anti-blocking ring (60) is positioned between the gear (40) and the body (10). The anti-blocking ring (60) is connected to the center shaft. The anti-blocking ring (60) comprises at least one foot (61 ) portion. Depending on the pressure applied on said foot (61 ), the anti-blocking ring (60) can be positioned. The anti-blocking ring (60) is connected to at least one second locking element (70). The part of the second locking element (70) facing towards the opening (11 ) has at least one second lock tongue (71 ). The other end of the second locking element (70) faces towards the center of the opening

[0041] (11 ). The second lock tongue (71 ) can fit into one of the thread forms (12) by moving from the center of the opening (11 ) towards the thread forms (12).

[0042] The second locking member (70) is connected with at least one second spring (72). Said second spring (72) continuously applies force to pull the second lock tongue (71 ) towards the center of the opening (1 1 ). In this way, under normal operating conditions, the second lock tongue (71 ) is prevented from fitting into the thread form (12) and moving the seat belt mechanism (1 ) into the locking position. When the gear (40) rotates above a certain g-force (preferably 2g), the centrifugal force overcomes the force applied by the first spring (51 ). However, the second lock tongue (71 ) of the second locking element (70) also moves towards the edge of the opening (11 ) and fits into one of the thread forms

[0043] (12) therein. Thus, the webbing (21 ) is prevented from unwinding in situations such as an accident, which would allow the webbing (21 ) to be quickly unwound from the pulley (20). As mentioned, the position changes between the released position (I) and the locking positions (II) of the seat belt mechanism (1 ) are provided by both the first locking element (50) and the second locking element (70). In this way, the seat belt mechanism (1) has a more secure structure.

[0044] There is at least one cocoon (62) on the anti-blocking ring (60). Said cocoon (62) is substantially a cavity located on the anti-blocking ring (60). The cocoon (62) comprises at least one first socket (63), at least one second socket (64) and at least one third socket (65). There is at least one pin (73) on the second locking element (70). Said pin (73) is integrated with the second locking element (70). The pin (73) is positioned on the face of the body of the second locking element (70) facing the anti-blocking ring (60).

[0045] The pin (73) is substantially configured to fit into the cocoon (62). The pin (73) can slide between the first socket (63), second socket (64) and third sockets (65) in the cocoon (62). Accordingly, depending on the movement of the second locking element (70), the pin (73) can follow two different paths, either between the first socket (63)-second socket

[0046] (64) or between the first socket (63)-third socket (65). Here, the second socket (64) is positioned closer to an outer wall (67) of the anti-blocking ring (60) than the third socket

[0047] (65). According to this structure, in the second locking element (70), the pin (73) will fit into the second socket (64) so that the second lock tongue (71 ) can fit into the thread forms (12) on the edge of the opening (11 ). In the case where the pin (73) fits into the third socket (65), locking will not be realized as the movement of the second lock tongue (71 ) towards the thread forms (12) will be restricted.

[0048] There is at least one guiding cavity (42) on the gear (40). The pin (73) fits into said guiding cavity (42). The guiding cavity (42) is formed to allow the second spring (72) to pull the second lock tongue (71 ) towards the center of the opening (1 1) in the released position (I).

[0049] There is at least one reclining extension (66) on the anti-blocking ring (60). Said reclining extension (66) is a protrusion on the surface of the anti-blocking ring (60) facing the gear (40). There is at least one slot (41 ) on the gear (40), which is configured to fit into the reclining extension (66). The reclining extension (66) can change position in the slot (41 ) between a released placement (a) and a locking placement (b) by sliding movement. The reclining extension (66) and slot (41 ) have the circular arc form to allow circular movement.

[0050] When the reclining extension (66) is in the released placement (a), the first lock tongue (52) of the first locking element (50) can move around the periphery of the pressure cover (80) and fit into one of the tongue sockets. In this way, the seat belt mechanism (1 ) can move to the locking position (II). When the reclining extension (66) takes the locking placement (b), it prevents the second locking element (70) from moving. As a result, the second lock tongue (71 ) cannot access the tongue sockets and the seat belt mechanism (1) remains in the released position (I).

[0051] In the light of all these descriptions, the seat belt mechanism (1 ) according to the invention performs its function as follows:

[0052] The seat belt mechanism (1) is in the released position (I) under normal operating conditions. In this position, the first spring (51 ) holds the first lock tongue (52) away from the lock striker and the second spring (72) holds the second lock tongue (71 ) away from the lock striker by means of the guiding cavity (42). Here, the pin (73) can move freely between the first socket (63) and the second socket (64). When the webbing (21 ) is intended to be quickly released from the pulley (20) in case of an accident, the first spring (51 ) is defeated by the centrifugal force and the first lock tongue (52) and the second lock tongue (71 ) fit into their respective lock strikes.

[0053] During the retraction of the webbing (21 ), the anti-blocking ring (60) cooperates with the gear (40). Here, in a preferred embodiment, the pressure cover (80) applies a compressive force to stretch the anti-blocking ring (60) by 0,3 mm. Thus, an ideal level of friction is obtained between the anti-blocking ring (60) and the body (10). As a result, the pin (73) fits into the third socket (65) and the seat belt mechanism (1 ) moves to the retracting position (III). Thus, the second locking element (70) is prevented from locking the seat belt mechanism (1 ). However, the reclining extension (66) moves into the locking placement (b), restricting the movement of the first locking element (50). Thus, the second locking element (70) is prevented from locking the seat belt mechanism (1 ).

[0054] The seat belt mechanism (1 ) according to the invention has a retracting position (III) in which the mechanism is prevented from locking by means of an anti-blocking ring (60). In this way, even if the webbing is retracted quickly (preferably enough to generate a force above 2g acceleration force), the mechanism is not locked.

[0055] The scope of protection of the invention is defined in the accompanying claims and cannot be strictly limited to those described in this detailed description for illustrative purposes. As it is clear that a person skilled in the art can present similar embodiments in the light of the foregoing without departing from the main subject matter of the invention.

[0056] REFERENCE NUMBERS GIVEN IN THE DRAWINGS

[0057] 1 Seat belt mechanism

[0058] 10 Body

[0059] 11 Opening

[0060] 12 Thread Form

[0061] 13 Webbing Guide

[0062] 20 Pulley

[0063] 21 Webbing

[0064] 30 Mainspring Cassette

[0065] 31 Mainspring

[0066] 32 Housing

[0067] 40 Gear

[0068] 41 Slot

[0069] 42 Guiding Cavity

[0070] 50 First Locking Element

[0071] 51 First Spring

[0072] 52 First Lock Tongue

[0073] 60 Anti-blocking Ring

[0074] 61 Foot

[0075] 62 Cocoon

[0076] 63 First Socket

[0077] 64 Second Socket

[0078] 65 Third Socket

[0079] 66 Reclining Extension

[0080] (a) Released Placement

[0081] (b) Locking Placement

[0082] 67 Outer Wall 70 Second Locking Element

[0083] 71 Second Lock Tongue

[0084] 72 Second Spring

[0085] 73 Pin

[0086] 80 Pressure Cover

[0087] (I) Released Position

[0088] (II) Locking Position (III) Rewind Position

Claims

CLAIMS1 . Particularly a seat belt mechanism (1 ) for use in extending and rewinding a seat belt (21 ) on a vehicle seat, having at least one body (10), at least one pulley (20) in said body (10) on which a webbing (21 ) can be wound, at least one mainspring cassette (30) for continuously rewinding the webbing (21 ) in connection with said pulley (20) and comprising at least a second locking element (70) for controlling the seat belt mechanism (1 ) to change position between a released position (I) in which the webbing (21 ) can move freely and a locked position (II) in which the webbing (21 ) is prevented from winding, characterized in that it comprises at least one thread form (12) which serves as a socket for a second lock tongue (71 ) of the second locking element (70) on said body (10), it comprises at least a second spring (72) which, in the released position (I), applies a force so as to pull said second lock tongue (71 ) towards the center of the opening (11 ) and away from said thread form (12), the seat belt mechanism (1 ) comprises at least one anti-blocking ring (60), which is connected by leaning against the body (10), said second locking element (70) is positioned between said anti-blocking ring (60) and the body (10), it comprises at least one cocoon (62) on the anti-blocking ring (60), the second locking element (70) comprises at least one pin (73) extending from the second locking element (70) towards the anti-blocking ring (60) to fit into said cocoon (62), the cocoon (62) comprises at least one second socket (64) into which the second locking element (70) fits in the locking position (II) of the seat belt mechanism (1), the cocoon (62) comprises at least a third socket (65) into which the pin (73) fits to prevent the seat belt mechanism (1 ) from moving into the locking position (II) when the webbing (21 ) is rewound.

2. A seat belt mechanism (1 ) according to the claim 1 , characterized in that it comprises at least one pressure cover (80) which is connected in such a way that the anti-blocking ring (60) abuts against the body (20) so that the anti-blocking ring (60) rubs against the body (20) during its rotational movement around itself.

3. A seat belt mechanism (1) according to the claim 2, characterized in that it comprises at least one first locking element (50) connected to the gear (40), it comprises at least one tongue socket formed on said pressure cover (80) such that said first locking element (50) can engage in a first lock tongue (52), it comprises at least one first spring (51) which applies a force to move said first lock tongue (52) away from said tongue socket.

4. A system (1) according to claim 1 , characterized in that it comprises at least one gear (40) positioned adjacent to the body (20).

5. A seat belt mechanism (1) according to the claim 4, characterized in that it comprises at least one slot (41) on said gear (40), it comprises at least one reclining extension (66) on the face facing the gear (40) of anti-blocking ring (60) configured to change position between a released placement (a) and a locking placement (b) by fitting into said slot (41), reclining extension (66) in said locking placement (b) is positioned so as to prevent the first locking element (50) from moving outward from the center of the gear (40).

6. A seat belt mechanism (1) according to the claim 1 , characterized in that the second socket (64) is positioned closer to an outer wall (67) of the anti-blocking ring (60) than the third socket (65).

7. A seat belt mechanism (1) according to the claim 2, characterized in that the pressure cover (80) is connected in such a way that the anti-blocking ring (60) is flexed in the range of 0,2-0, 4 mm and pressed against the body (20).

Images