CA1304330C - Automatic seatbelt system for vehicle - Google Patents
Automatic seatbelt system for vehicleInfo
- Publication number
- CA1304330C CA1304330C CA000553108A CA553108A CA1304330C CA 1304330 C CA1304330 C CA 1304330C CA 000553108 A CA000553108 A CA 000553108A CA 553108 A CA553108 A CA 553108A CA 1304330 C CA1304330 C CA 1304330C
- Authority
- CA
- Canada
- Prior art keywords
- slider
- webbing
- movement
- ratchet member
- unfastening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Automotive Seat Belt Assembly (AREA)
Abstract
ABSTBACT OF THE DISCLOSURE
An automatic seatbelt system for a vehicle, which is designed to restrain the body of an occupant when an emergency situation of the vehicle occurs, has a slider which retains one end of a webbing and which is movable along a guide rail laid on the body of the vehicle between a position at which the webbing is fastened to the occupant's body (hereinafter referred to as a "webbing fastening position and a position at which the webbing is unfastened therefrom (hereinafter referred to as a "webbing unfastening position"), and a continuous member for moving the slider between the above-described two positions. The continuous member and the slider are allowed to move relative to each other by a predetermined amount. In addition, a member is provided at an end of the guide rail on the side thereof which is closer to the webbing fastening position, the member being adapted such that, when the slider is moved to the webbing fastening position, the member inhibits the slider from moving toward the webbing unfastening position, whereas, when the continuous member moves from the webbing fastening position toward the webbing unfastening position, the member is actuated by virtue of the relative movement occurring between the continuous member and the slider so as to allow the slider to move toward the webbing unfastening position. Accordingly, when the slider is at the webbing fastening position, it is inhibited from moving along the guide rail.
An automatic seatbelt system for a vehicle, which is designed to restrain the body of an occupant when an emergency situation of the vehicle occurs, has a slider which retains one end of a webbing and which is movable along a guide rail laid on the body of the vehicle between a position at which the webbing is fastened to the occupant's body (hereinafter referred to as a "webbing fastening position and a position at which the webbing is unfastened therefrom (hereinafter referred to as a "webbing unfastening position"), and a continuous member for moving the slider between the above-described two positions. The continuous member and the slider are allowed to move relative to each other by a predetermined amount. In addition, a member is provided at an end of the guide rail on the side thereof which is closer to the webbing fastening position, the member being adapted such that, when the slider is moved to the webbing fastening position, the member inhibits the slider from moving toward the webbing unfastening position, whereas, when the continuous member moves from the webbing fastening position toward the webbing unfastening position, the member is actuated by virtue of the relative movement occurring between the continuous member and the slider so as to allow the slider to move toward the webbing unfastening position. Accordingly, when the slider is at the webbing fastening position, it is inhibited from moving along the guide rail.
Description
3~
AUTOMATIC SEATBELT SYSTEM FOR VEHICLE
BACKGRO~ND OF THE INVENTION
1. Field of the Invention The present invention;relates to a seatbelt system for a vehicle designed to restrain the body of an occupant when an emergency situation of the vehicle occurs. More particularly, the present invention pertains to an automatic seatbelt system for a vehicle which enables a webbing to be automatically fastened to the body of an occupant after seating himself in a seat provided on the vehicle.
AUTOMATIC SEATBELT SYSTEM FOR VEHICLE
BACKGRO~ND OF THE INVENTION
1. Field of the Invention The present invention;relates to a seatbelt system for a vehicle designed to restrain the body of an occupant when an emergency situation of the vehicle occurs. More particularly, the present invention pertains to an automatic seatbelt system for a vehicle which enables a webbing to be automatically fastened to the body of an occupant after seating himself in a seat provided on the vehicle.
2. Description of the Related Art There are various types of automatic seatbelt system for a vehicle which are adapted to enable a webbing to be automatically fastened to the body of an occupant. As one type of such automatic seatbelt system, a structure has already been proposed wherein a slider is provided in such a manner as to be movable along a guide rail laid on the body of a vehicle, and this slider is activated by drive means so as to move a webbing which is retained at one end thereof by the slider.
The guide rail employed in this system is arranged such that an end portion thereof which is closer to the rear end of the vehicle is terminated after being bent so as to extend downward in the substantially vertical direction along a center pillar, thereby allowing the guide rail to ~3(~330 r reliably carry the tension qenerated in the webbing by the inertia which acts on the occupant's body when an emergency situation of the vehicle occurs. The guide rail arran~ed as described above needs retainer means for retaining the slider in such a manner that the slider is inhibited from moving toward the ceiling of the vehicle along the vertically extended portion of the guide rail when the vehicle overturns.
Seatbelt systems having such retainer means have already been devised wherein a sensor such as a pendulum for detecting overturn of the vehicle is provided, and the movement of the slidex is inhibited when this sensor is activated ~e.g., Japanese Patent Publication No. 15716/1985). This type of retainer means suffers, however, from the problem that, since a sensor such as a pendulum projects from the guide rail, it is necessary to form a bore in the center pillar for receiving such projecting sensor structure or provide a raised portion on the center pillar which protrudes into the compartment of the vehicle.
SUMMA~y-oF THE INVENTION
In view of the above-described circumstances, it is a primary object of the present invention to provide an automatic seatbelt system which i6 50 designed that the retainer means, which is adapted to inhibit the movement of 13~4;~30 the slider when the vehicle overturns, has a simplified arrangement and a reduced size.
To this end, the present invention provides an automatic seatbelt sy.stem for a vehicle which comprises: a guide rail laid on the body of the vehicle; a slider retaining a webbing and adapted to be movable along the guide rail between a position at which the webbing is fastened to the body of an occupant (hereinafter referred to as the ~webbing fastening positionn) and a position at which the webbing is unfastened therefrom (hereinafter referred to as the "webbing unfastening positionn); dcive means adapted to move along the guide rail in such a manner as to ~pply driving force to the slider, the drive means being movable relative to the slider by a predetermined amount along the guide rail; and retainer means adapted such that, in response to the movement of the ~lider to the webb$ng fastening position, the retainer means is brought into a f~rst state wherein it can inhibit the movement of the slider toward the webbing unfastening position, and in response to the above-described relative movement which occurs when the drive means moves toward the webbing unfastening position from the webbing fastening position, the retainer means is brought into a second state wherein it allows the slider to move toward the webbing unfastening position.
13~4330 By virtue of the above-described arrangement, when the slider is at the webbing fastening position, it is inhibited from moving along the guide rail. Thus, the retainer means need not be provided~with any special sensor means such as an acceleration sensor, so that the arrangement of the retainer means is simplified, and the size of the means is reduced.
BRI E~ nE8fBIpTI ON~5E~ LDBA~1~15 Fig. 1 is a fraqmentary side view of a vehicle to which a first embodiment of the automatic seatbelt system according to the present invention is applied, as viewed from the inside of the vehicle;
Fig. 2 is a sectional view taken along the line II-II
in Fig. 1, which shows the slider having moved to the central portion of the guide rail;
Fig. 3 is a partially fiectioned side view of an essential part of the first embodiment, which particularly shows the retainer means;
Fig. 4 is an exploded perspective view of an essential part of the arrangement shown in Fig. 3;
Fig. 5 is a sectional view taken along the line V-V in Fig. 3, which particularly shows the retainer means with the housing removed;
Fig. 6 is a partially cutaway perspective view of the housing of the retainer means;
~3~`4330 Fig. 7 is a sectional view taken along the line VII-VII
in Fig. 3;
Fig. 8 is a view employed to explain the operation of the essential part of. the first embodiment shown in Fig. 3;
Fig. 9 is a partially sectioned side view of an essential part of a second embodiment of the present invention, which particularly shows retainer means employed in the second embodiment;
Fig. 10 is a view employed to explain the operation of the retainer means shown in Fig. 9;
Fig. 11 is a partially cutaway perspective view of the retainer means of the second embodiment;
Fig. 12 is a partially sectioned side view of an essential part of a third embodiment of the present invention, which particularly shows retainer means employed in the third embodiment;
Fig. 13 is a partially sectioned side view of an essential part of a fourth embodiment of the present invention, which particularly shows retainer means employed in the fourth embodiment;
Fig. 14 is a partially sectional side view of an essential part of a fifth embodiment, which corresponds to Fig . 3 of the first embodiment;
Fig. 15 is a view employed to explain the operation of the essential part of the fifth embodiment shown in Fig. 14, ~3~4;~30 which corresponds to Fig. 8;
Fig. 16 is an exploded perspective view of the essential part of the fifth embodiment; and Fig. 17 is a cutaway perspective view of a housing of the fifth embodimet.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention will be described hereinunder in detail with reference to the accompanying drawing~.
Fig. l is a fragmentary side view of a vehicle to which a first embodiment of the seatbelt system according to the present invention is applied, as viewed from the inside of the vehicle.
~3C4;~30 The arrangement is such that, when an occupant 12 is seated in a seat 10 ~hich is on the right-hand side of the vehicle with respect to the forward direction, his body is automatically fastened with a webbing 14. The webbing 14 is wound up from one end thereof into a retractor 18 by means of a predetermined biasing force, the retractor 18 being secured to a floor member 16 in the substantially central portion of the vehicle. The retractor 18 incorporates an inertia type lock mechanism adapted to instantaneously stop the webbing 14 from being unwound when an emergency situation of the vehicle occurs.
The other end of the webbing 14 is retained by a slider 22 through an anchor plate 20. The slider 22 is adapted to be movable in the longitudinal direction of the vehicle along a quide rail 24. The guide rail 24 includes a guide rail main body 28. The central portion of the main body 28 is disposed horizontally along a roof side member 26 which constitutes a part of the side wall of the vehicle body.
The forward end portion of the guide rail main body 28 i8 slanted along a front pillar 30 and secured thereto.
The end portion of the gulde rail main body 28 on the side thereof which is closer to the rear end of the vehicle is bent at substantially right angles so as to extend toward 13~4330 the lower side of the vehicle, and secured to a center pillar 32.
As shown in Fig. 2, the guide rail main body 28 has a groove 34 which opens toward the lower side of the vehicle, thus having a substantially U-shaped cross-section as a whole. The intermediate portion of the groove 34 in the depthwise direction thereof is enlarged in width so as to receive an enlarged-width portion 36 which is formed on the intermediate enlarged portion of the slider 22. This enlarged-width portion 36 enables the slider 22 to move smoothly within the guide rall main body 28 in the longitudinal direction thereof, that is, in the longitudinal direction of the vehicle. In addition, the enlarged-width portion 36 is adapted to carry the tension applied to the webbing 14 by the occupant when the vehicle is in a normal state 80 that the slider 22 does not come off the guide rail main body 28.
The bottom portion of the groove 34 in the main body 28 is also enlarged in width to define a tape accommodating groove 38 which slidably guides a flexible tape 40, serving as drive means, in the longitudinal direction of the guide rail 24.
The flexible tape 40 is, as also shown in Fig. 4, made from a continuous thick-walled synthet~c res~n m~terial. A
plurality of openings 42 are formed in the tape 40 in such a 13~4~30 manner that they are arranged in a row at a predetermined regular spacinq alonq the longitudinal axis of the tape 40.
These openings 42 are adapted to engage with a sprocket wheel (not shown) accommodated within a housing 44 which is disposed on the lower part of the center pillar 32 as shown in Fig. 1, so that the rotational force from a motor 46 is transmitted to the tape 40 through the engagement between the sprocket wheel and the openings 42, thus causing the tape 40 to move along the longitudinal axis thereof.
Since the enlarged-width portion 36 which mainly carries the load applied from the slider 22 is disposed below the tape accommodating groove 38 within the guide rail 24 as described above, even when a relatively large load ~s applied from the slider 22, there is no fear of-the flexible tape 40 and the tape accommodating groove 38 being deformed to a substantial degree, and it is therefore possible to prevent the tape 40 from falling into an operation failure.
As ~hown in Fig. 4, an elongated opening 50 which has a longer longitudinal dimenslon than that of the openings 42 is formed in an end portion of the flex$ble tape 40 on the slde thereof which is clo~er to the front end of the vehicle. The elongated opening 50 receiveR a portion of the slider 22 which is lntermedlate between the head portion 52 and the enlarged-width portion 36. In consequence, when the flexible tape 40 moves in the longitudinal direction of the 13~4330 vehicle along the guide rail 24, the slider 22 is driven by the tape 40 and can move in the longitudinal direction of the vehicle along the guide rail 24 together with the tape 40. As shown in Fig~ 1, when the slider 22 is moved to the forward end of the guide rail 24, the slider 22 brings the webbing 14 to a position at which the webbing 14 is unfastened from the occupant's body as shown by the imaginary line (this position being hereinafter referred to as a "webbing unfastening positionn), whereby a space for the occupant 12 to enter and leave the vehicle can be deined betwen the webbing 14 and the seat 10. When the slider 22 is moved to the rear end of the guide ra~l 24 as shown by the solid line in Fig. 1, the webbing 14 is brought to a position at which it is fastened to the occupant's body (this position being hereinafter referred to as a ~webbing fastening position~), whereby the occupant 12 can automatically be fastened with the webbing 14.
As shown in Fig. 4, the longitudinal dimension L of the elongated opening 50 is made larger than the longitudinal dimension R of the head portion 52, so that, when the head portion 52 abuts against either the longitudinal edge 50A or 50B of the elongated opening 50 on the side thereof which is closer to the front or rear end of the vehicle, respectively, a space or play S is defined between the head portion 52 and the other of the two longitudinal edges of ~3~4~30 the opening 50. Accordingly, the flexible tape 40 and the slider 22 are movable relative to each other by an amount corresponding to the length of the space S, so that, even when the tape 40 is s.tarted to move, the slider 22 is not moved until the space or play S has disappeared.
Referring to Figs~ 3 to 6, a retainer means 54 is disposed on the vertically extended portion of the guide rail 24 which is defines the rear end portion thereof. The retainer.means 54 includes a hollow housing 56 which is disposed adjacent to the lower end of the guide rall ma~n body 28 and rigidly secured to the center pillar 32 through a reinforcing bracket 58. This bracket 58 has a substantially U-~haped cross-section so that it cover6 the forward end surface and two lateral side surfaces of the housing 56. The bracket 58 has mounting bores 60 provided in the end portion of each of the side walls theeeof, and mounting bolts are respectlvely received through the~e bore~
60 to rigidly secure the bracket 58 to the center pillar 32.
It should be noted that the housings 56 and 44 are connected together by a guide tube 61 which tightly accommodates the flexible tape 40.
As shown in Figs. 3 and 4, an anchor pin 62 is secured at both end portions thereof to the bracket 58 in such manner that the anchor pln 62 opposes the lntermedlate enlarged portion of the slider 22 having the enl~rged-width 13~4;~30 portion 36 formed thereon when the slider 22 is stopped at the webbing fastening position. Thus, when a relatively large tension acts on the webbing 14 at the webbing fastening position so. as to force the slider 22 to come out of the groove 34 in the guide rail main body 28, the anchor pin 62, which is located on the side of the intermediate enlar~ed portion of the slider 22 which is closer to the front end of the vehicle, engages with the enlarged-width portion 36, thereby preventing the slider 22 from coming off the guide rail main body 28.
A latch pawl 64 which is used as a locking apparatus is disposed within the housing 56 in such a manner that the pawl 64 opposes the enlarged-width portion 36 of the slider 22 when stopped at the webbing fastening position. This pawl 64 is received in a support bore 66 with a triangular cross-section which extends through the housing 56 in the lateral direction of the vehicle, and adapted to be pivotal in the direction of the arrow A about one vertex of the triangular support bore 66.
More specifically, when the pawl 64 pivots maxlmumly within the triangular support bore 66 counterclockwise as viewed in Fig. 3, the distal end of the pawl 64 is interposed in the locus of movement of a hook portion 68 provided at the distal end portion of the enlarged-width portion 36, theceby making it possible to inhibit the slider 22 f rom moving toward the upper side of the vehicle. When 13~4~30 the pawl 64 moves maximumly clockwise as shown in ~ig. 8, the distal end of the pawl 64 is withdrawn from the locus of movement of the hook portion 68, thereby allowing the slider 22 to move upward. For this purpose, the pawl 64 is baised by a torsion coil spring 70 so as to be brought into the state shown in Fig. 3, that is, in the state wherein the pawl 64 is interposed in the locus of movement of the hook portion 68. Thus, the pawl 64 and the torsion coil spring 70 constitute in combination an engagement section for engagement with the hook portion 68.
Support bores 72 are formed in the houslng 56 as shown in Fig. 6, and support shafts 76 of a ratchet member 74 shown in Fig. 4 are respectively received in the support bores 72. This ratchet member 74 is provided for the purpose of controlling the pawl 64. Two lateral end portions of ~he ratchet member 74 are bent at right angles so as to extend parallel with each other, thereby defining a pair of leg plate portions 78. The support shafts 76 are coaxially formed on the leg plate portions 78, respectively, so as to project in opposite directions. Accordingly, in assembly, the ratchet member 74 is lnserted lnto the housing 56 while the leg plate portlons 78 are being elastically deformed toward each other, whereby the support shafts 76 enter the corresponding support bores 72 by virtue of the restoring force of the leg plate portions 78, and the ~3C}4~30 ratchet member 74 is thereby pivotally supported within the housing 56.
The ratchet member 74 has a pawl portion 80 projecting from the central portion thereof in such a manner that the pawl portion 80 is able to enter the elongated opening 50 in the flexible tape 40. When the pawl portion 80 of the ratchet member 74 is within the elongated opening 50, the pawl 64 is interposed in the locus of movement of the hook portion 68 as shown in Fig. 3. However, when the pawl portion 80 is out of the elongated opening 50 as shown in Fig. 8, the ratchet member 74 causes the pawl 64 to move against the biasing force from the torsion coil spring 70 so as to be withdrawn from the locus of movement of the hook portion 68.
The pawl portion 80 of the ratchet member 74 is disposed in such a manner that it is able to enter the elonqated opening 50 when the flexible tape 40 moves to the position shown in Fig. 3 and the slider 22 consequently reaches the webbing fastening position. Accordlngly, when the tape 40 moves toward the webbing unfastening posltlon, the pawl portion 80 is caused by the rear edge 50B of the elongated opening 50 to pivot counterclockwise as viewed in Fig. 3 about the support shafts 76, thus causing the pawl 64 to move the retraction position shown in Fig. 8 before the tape 40, which is moving toward the webbing unfastening 13C~4;~30 position, makes the space or play S disappear and causes the ~lider 22 to be started to move.
Guide bores 82 are respectively provided in the leg plate portions 78 of-the ratchet member 74. The guide bores 82 respectively receive pins 86 projecting from both sldes of a slide block 84 which is received in slide grooves 83 formed inside the housing 56 and which is movable only in directions parallel to the direction of movement of the flexible tape 40. More sp2cifically, the 61ide block 84 is disposed between the pair of leg plate portions 78, and the pins 86 which coaxially pro~ect in opposite directions are respectively received in the guide bores 82 from the inside of the leg plate portions 78.
The slide block 84 is arranged such that, when the slider 22 reaches the webbing fastening posit~on, the sl~de block 84 i5 pressed and moved by the hook portion 68 as shown in Fig. 3, thus cau~ing the pins 86 to enter larger-width portions 82A (see Fig. 4) of the gulde bores 82, respectively. In this state, the pins 86 allow the ratchet member 74 to pivot from the posltion shown in Fig. 3 to the position shown in Fig. 8.
When the slider 22 is moved to the webbing unfastening position, the slide block 84 i8, as shown in Fig. 8, released from the contact with the hook portion 68 and therefore pushed out toward the slider 22 by the action of a 13(~4;~30 projecting detector element 90 of a limit switch 88 which is secured to the housing 56. This projecting detector element 90 is constantly biased so as to project from the limit switch 88 by the force from a resilient member (not shown) which is mounted inside the limit switch 88. Thus, when the detector element 90 is in its projecting position, the fact that the slider 22 is not at the webbing fastening position can be detected, whereas, when the detector element 90 is withdrawn into the limit switch 88 as shown ln Fig. 3, it is possible to detect the fact that the slider 22 is at the webbing fastening position.
Accordingly, when the slide block 84 is in the state shown in Fig. 8, it is pushed out by the projecting detector element 90, causing the pins 86 to enter smaller-width portions 82B of the guide bores 82, respectively. In consequence, the ratchet member 74 is pivoted about the support shafts 76 and held in the state shown in Flg. 8.
More specifically, the ratchet member 74 allows the pawl 64 to be held in a state wherein it is withdrawn from the locus of movement of the hook portion 68 with a margin and the pawl portion 80 to be held in a state wherein it is withdrawn from the locus of movement of the flexible tape 40 with a margin. Therefore, in the state shown in Fig. 8, when the flexible tape 40 moves along the longitud~nal axis thereof, it is prevented from contacting the pawl portion ~3(~4~30 80, and when the slider 22 moves toward the webbing unfastening position, it is prevented from contacting the pawl 64. Thus, the ratchet member 74, the slide block 84 and the projecting detector element 90 con~titute in combination a release section which allows the pawl 64 to be separated from the hook portion 68.
In order to ensure the required movement of each of the associated portions, the larger-width portion 82a of each of the guide bores 82 in the ratchet member 74 has a dimens~on which allows the pin 86 to move therein with a margin.
In addition, the slider 22 is arranged such that the enlarsed-width portion 36 is stopped by abuttinq against the inner ends 83A of the guide grooves 83 formed inside the housing 56. A cu~hioning material such as rubber may be interposed between the enlarged-width portion 36 and the end portions 83A.
The followinq is a description of the operation of the above-described embodiment.
After seating himself in the seat 10, the occupant 12 actuates a manually-operated switch. Alternatively, the fact that the occupant 12 enters the vehicle and seats himself in the seat 10 is detected by swltch means such as a switch adapted to detect whether the door i8 open or closed and a switch provided in the seat 10. In consequence, the motor 46 is activated to move the flexible tape 40 toward ~3a4;~30 the rear end of the vehicle. This movement of the tape 40 causes the webbing 14 to n~ove from the webbing unfastening position shown by the imaginary line in Fig. 1 to the webbing fastening position shown by the solid line so as to be automatically fastened to the body of the occupant 12.
The slider 22 is driven to move toward the rear end of the vehicle while abutting against the forward edge SOA of the elongated opening 50 formed in the tape 40 with a space or play S defined between the head portion 52 and the rear edge 50B of the opening S0.
Near the stroke end of the slider 22, it moves downward from the position shown in Fig. 8. In consequence, the hook portion 68 of the slider 22 forces the projecting detector element 90 into the limit switch 88 through the sllde block 84 as shown in Fig. 3. Thus, the limit switch 88 detects the fact that the slider 22 has reached the webbing fastening position, and control means (not shown) suspends the rotation of the motor 46.
The slide block 84 thus moved by the hook portion 68 causes the pins 86 to move to the larger-width portions 82A
from the smaller-width portions 82B, respectively, thus allowing the ratchet member 74 to pivot. In consequence, the pawl 64, which has been moved to and held at the retraction position by the ratchet member 74, causes the ratchet member 74 to pivot clockwise by virtue of the ~3~P4;~30 biasing force from the torsion coil spring 70, thereby bringing the ratchet member 74 into the state shown in Fig. 3. At the same time, the pawl 64 is interposed in the locus of movement of the hook portion 68 and enters the recess on the side of the hook portion 68 which is closer to the upper side of the vehicle as shown in Flg. 3.
Accordingly, the slider 22 is inhibited from moving toward the upper side of the vehicle. In addition, the ratchet member 74 pivots clockwise as viewed in Fig. 3, and the pawl portion 80 enters the space S defined in the elongated opening 50.
When the vehicle is in a normal state, the webbing 14 can be unwound from the retractor 18; therefore, the occupant 12 can assume any desired driving posture.
When the vehicle runs into an emergency situat$on, the retractor 18 stops the webbinq 14 from being unwound, so that the body of the occupant 12 is restrained by the webbing 14.
In an emergency situation of the vehicle, a relatively large tension is generated in the webbing 14 by the inertia which acts on the occupant's body, and transmitted to the slider 22 through the anchor plate 20. However, since the anchor pin 62 is diposed in opposing relation to the slider 22, the slider 22 is reliably supported by the vehicle body through the bracket 58.
~3~4;~30 When the vehicle overturns, the hook portion 68 of the slider 22 is also inhibited by the pawl 64 from moving toward the upper side of the vehicle. There is therefore no fear of the slider 22 moving toward the ceiling of the vehicle.
In the case where the occupant 12 leaves the vehicle upon the completion of a normal drive, when he opens the door, the control means activates the motor 46 to rotate in reverse.
Accordinqly, the flexible tape 40 is moved toward the front end of the vehicle within the guide rail main body 28.
At this time, even when the tape 40 moves from the position shown in Fig. 3, the slider 22 is not moved until the rear edge 50B of the elongated opening 50 abuts against the slider 22. Before the rear edge 50B abuts against the slider 22, the relative movement between the tape 40 and the slider 22 causes, through the opening 50, the ratchet member 74 to pivot counterclockwise as viewed in Fig. 3 about the support shafts 76. This movement of the ratchet member 74 causes the pawl 68 to pivot from the position shown in Fiq. 3 to the position shown in ~ig. 8 so as to be withdrawn from the locus of movement of the hook portion 68.
Accordingly, the slider 22 is released and allowed to move toward the front end of the vehicle together with the flexible tape 40 when the rear edge 50B of the e~ongated 13~4~30 opening 50 abuts against the slider 22 and thereby causes the latter to be started to move.
When the slider 22 which is driven by the tape 40 reaches the front end of the vehicle as shown in Fig. 1, a limit switch (not shown) is activated so as to suspend the rotation of the motor 46, thereby allowing the webbing 14 to be automatically unfastened from the body of the occupant 12.
During such movement of the flexible tape 40, the slide block 84,~which has been released from the contact with the slider 22, is pushed up by the projecting detector element 90 of the limit switch 88 as shown in Fig. 8. Consequently, the pawl portion 80 of the ratchet member 74 is separated from the tape 40, and there is therefore no fear of the pawl portion 80 contacting the edges of the openings 42 to generate noise when the tape 40 is moved.
In addition, the ratchet member 74 holds the pawl 64 ~n a state wherein it is withdrawn from the locus of movement of the hook portion 68 with a margin. There is therefore no risk of the pawl 64 interfering with the hook portion 68 when the slider 22 is moved.
When the occupant 12 opens the door thereafter in order to re-enter the vehicle, the same operation as that which has already been described takes place. Namely, after the occupant 12 has been seated, the slider 22 i6 moved toward 13~4~30 the rear end of the vehicle again, thereby allowing the webbing 14 to be automatically fastened to the occupant' body.
Referring next to Figs. 9 to 11, there is ~hown a second embodiment of the present invention. In this embodiment, the slide block 84 and the pawl 64 which are employed in the above-described embodiment are omitted, and a pin 92 is stretched between the leg plate portions 78 of the ratchet member 74 so as to serve as a member similar to the pawl 64 in the first embodiment. Both ends of the pin 92 project from the leg plate portions 78 and are respectively received in Elots 93 formed ln the housing 56, thereby limiting the angle of rotation of the ratchet member 74.
In addition, a spr~ng retainer pin 94 project~ from the inner slde of each of the leg plate portions 78 of the ratchet member 74, and a tenslon coil spring 98 i8 stretched be~ween the pin 94 and a spring retainer pin 96 which projects from each of the opposing inner sides of the housing 56. Thi6 tension coil spring 98 i8 a turnover spring which causes the ratchet member 74 to perform snap action. More fipecifically, when the axis of the ten~ion coil spring 98 is positioned closer to the flexible tape 40 than the prolongation of the axes of the support shaft6 76, the spring 98 biasefi the ratchet member 74 80 as to pivot ~3~4;~30 clockwise as viewed in Fig. 9, whereas, when the axi~ of the spring 98 is shifted passing the prolongation of the axes of the support shafts 76 in a direction in which it is separated from the tape 40, the spring 98 biases the ratchet member 74 so as to pivot counterclockwise as viewed in Fig. 9, thereby allowing the ratchet member 74 to pivot to the position shown in Fig. 10.
In addition, when the pawl portion 80 of the ratchet member 74 which is within the elongated opening 50 as shown in Fig. 9 is caused to pivot counterclockwise as viewed in Fig. 8 by the front edge 50A of the opening S0 when the flexible tape 40 is moved, the ratchet member 74 causes the axis of the tension coil spring 98 to pass its neutral point defined by the prolongation of the axes of the support shafts 76 and move to the other side, thereby allowing the ratchet member 74 to move to the position shown in Fig. 10 by the action of the spring 98.
In the case where the ratchet member 74 is maximumly pivoted counterclockwise by the biasing force from the tension coil spring 98 as shown in Fig. 10, when the slider 22 is moved to the webbing fastening position, the enlarged-width portion 36 of the slider 22 abuts againt the ratchet member 74 and causes the latter to pivot clockwi6e as viewed in Fig. 10. In consequence, the axis of the tension coil spring 98 passes the prolongation of the axes of the support 13G~;~30 shafts 76, and this also forces the ratchet member 74 to pivot clockwise, thus allowing the pawl portion 80 to enter the elongated opening 50.
Accordingly, in this embodiment also, when the slider 22 is at the webbing fastening position as shown in Fig. 9, the pawl portion 80 of the ratchet member 74 is within the elongated opening 50, and the pin 92 is disposed on the side of the the hook portion 68 which is closer to the upper side of the vehicle, whereby it is possible to prevent the slider 22 from moving accidentally or undesirably. When the flexible tape 40 is moved toward the webbing unfastening position, the pawl portion 80 is pushed down by the rear edge 50B of the elongated opening 50 to the position shown in Fig. lO. Therefore, the pin 92 is withdrawn from the locus of movement of the hook portion 68 before the space or place S defined ~n the elongated opening 50 of the tape 40 disappears and the tape 40 consequently causes the slider 22 to be started to mobe, thereby allowing the slider 22 to move. Since, in this sate, the pawl portion 80 ha~ already been separated from the tape 40 at an adequate spacing, there is no fear of the pawl portion 80 abutting againt the edges of the openings 42 in the take 40.
It should be noted that the tension coil spring 98 in this embodiment may be disposed in such a manner that it constantly biases the ratchet member 74 so as to pivot 13(~4;~30 clockwi~e as viewed in Figs. 9 and 10. In such case, the width A of the pawl portion 80 1R made larger than the width B of the openings 42 in the tape 40 80 that there iB no fear of the pawl portion 80 entering the openings 42 to generate noi~e when the flexible tape 40 i6 moved.
Referring next to Fig. 12, there i8 shown a third embodiment of the present invention. The ratchet member 74 in this embodiment has an arrangement substantlally similar to that in the second embodiment. In this embodiment, however, the ratchet member 74 ha~ an arm 102 which projects from a position in the vicinity of the support shaft~ 76 ~o as to oppose a leaf spring 104 which ls secured at one end thereof to the housing 56. A pair of recesses 106 and 108 are formed in the intermediate portlon of the leaf ~pring 104 in such a manner tha~ each of the rece~ses 106 and 108 is able to accommodate the distal end of the arm 102, thereby controlling the pivoting motion of the ratchet member 74.
Thus, when the ratchet member 74 abuts against the enlarged-width portion 36 of the slider 22 which is moved downward, the ratchet member 74 is able to move from the position shown by the solid line in Fig. 12 in which the pin 92 is withdrawn from the locus of movement of the hook portion 68 to the position shown by the phantom line in which the pawl portion 80 is within the elongated opening 50 13~4;~3~
in the flexible ~ape 40. ~rhus the ratchet member 74 in thi~
embodiment performs an action similar to that in the above-described embodiments.
In this embodiment, when the ratchet member 74 which i6 in the position shown by ~he imaginary line is pivoted counterclockwise to come close to the position shown by the solid line, the arm 102 of the ratchet member 74 i8 biased by the leaf spring 104 so as to turn and enter the recess 106 thanks to the configuration of the recess 106. In consequence, the arm 102 is moved into the recess 106.
Thus, when the ratchet member 74 is in the position shown by the solid line, the pawl portion 80 can be held in a state wherein it is separated from the flexible tape 40.
Fig. 13 shows a fourth embodiment of the present invention.
In this embodiment, a torsion coil sping 110 serves as both the ratchet member 74 and the pawl 64 in the fir~t embodiment.
More specifically, a coil portion 110A formed on the intermediate portion of the spring 110 i8 rotatably supported on a spring retainer pro~ection 114 which i8 rigidly secured to the housinq 56. One end portion of the ~pring 110 is retained by a retainer pro~ection 116. A coil portion 110B which is adjacent to the coil portion 110A i8 dispo~ed in such a manner a~ to hold the pin 92. The other 13~ 3~
end portion of the spring 110 ~s bent to define a ratchet portion llOC which serves as a member similar to the ratchet member 74 in the above-described embodiments.
Therefore, in this embodiment, when the slider 22 is in the position shown in Fig. 13, the ratchet portion llOC i8 within the elongated opening 50, and the pin 92 i5 interposed in the locus of movement of the hook portion 68.
When, in this state, the slider 22 is moved toward the webbing unfastening position, the ratchet portion llOC is expelled from the elongated opening 50. In confiequence, the torsion coil spring llO is forced to pivot counterclockwise as viewed in Fig. 13 about the coil portlon llOA so as to be elastically deformed, thereby causing the coil portion llOB
and the pin 92 to be withdrawn from the locu~ of movement of the hook portion 68, and thus allowing the movement of the slider 22.
After the slider 22 has moved, the ratchet portion llOC
which ~s pressed by the flexible tape 40 holds the pin 92 out of the locus of movement of the hook portion 68.
However, when the slider 22 returns to the webbing fastening posit$on shown in Fig. 12, the ratchet port$on llOC enters the elongated opening 50, so that the pin 92 is interposed in the locus of movement of the hook portion 68 aga~n.
In this case, the length A of the ratchet portion llOC
is preferably made so large that it cannot enter the openings 42 in the flexible tape 40.
~3(~4~30 A fifth em~odiment ol ~he present invention is silowrl in Figs~ 14 through 17. In this embodiment, the slide block ~4 and the latch pawl ~ use(~in the first embodiment are omitted, but a lock pin 570 is provided between leg plates 78 of a ratchet member 74A, and the lock pin 570 is able to be made of metal or the like. The lock pin 570 is engageable with the hook portion 68 as the same manner in the second embodiment shown in Figs. 3 through Fig. 11.
A control pin 580 provided to a detector element 578 of a limit switch 576 is inserted in a guide bore 82 of the ratchet member 74A. The detector element 578 is longitudinally slidably disposed to the limit switch 576 through a hole formed in a housing 56A, and the control pin 580 is transversely extended from the detector element 578.
In this embodiment, as shown in Figs. 14 and 15, a compressed coil spring 575 urges a pawl 80 of the ratchet member 74A to a direction of the flexible tape 40.
Accordingly, in the embodiment, as the slider 22 pushes in the detector element 578 to the limit switch 576 at a stroke end portion resistant to a spring member which is not shown in the drawings, but provided in the limit switch 576, a driving motor for the flexible tape is stopped by the limit switch, and the control pin 580 is inserted in a larger width portion 82A of the guide bore 82 of the ratchet member 74A, and then a pawl portion 80 of the ratchet member 74A is gotten into the longitudinal opening 50 of the flexible tape ~y the urginq force of the coil ; 2~
~3(~4;~30 spring 575.
At this condition, even though external force is upward added to the slider 22 from the webbing 14 in Fig.
14, the external force is received by the body of the vehicle through the housing 56A and projected portions 559 of a bracket 58A.
At the time of automatically setting the webbing to an occupant, referring Fig. 14, when the flexible tape 40 is upward driven, the pawl portion 80 is withdrawn by the flexible tape 40 from the locus of movement thereof, and the pin 570 is disengaged from the hook portion of the slider 22, then the slider 22 is delayingly moved in accordance with the relative movement with the flexible tape 40. At this stage, the control pin 580 of the detector element 578 is slidingly received in a smaller width portion 82B of the guide bore 82, and the ratchet member 74A is prevented from pivotal movement.
The pin 570 is not limited to around shape in a cross-sectional view, and can be formed to any shape.
Moreover, the pin 570 can integrally formed with the ratchet member 74A by diecasting. The compressed coil spring 575 can be replaced with any other leaf spring or the like.
The anchor pin 62 used in each embodiments can be omitted, and substitutionally the bracket 58 is able to be constituted so as to receive by itself the large force of the webbing 14 which may occur in the emergency of the vehicle.
13~330 It should be noted that the drive means employed in the present invention is not necessarily limitative to a continuous member su~h as a flexible tape, and any other type of drive means may be employed.
As has been described above, the automatic seatbelt system for a vehicle according to the present invention comprises: a guide rail laid on the body of the vehicle; a slider retaining a webbing and adapted to be movable along the guide rail between a position at which the webbing is fastened to the body of an occupant (hereinafter referred to as a "webbing fastening position~) and a position at which the webbing is unfastened therefrom (hereinafter re~erred to as a "webbing unfastening position~); drive means adapted to move along the guide rail in such a manner as to apply driving force to the slider, the drive means being movable relative to the slider by a predetermined amount along the guide rail; and retainer means adapted such that, in response to the movement of the slider to the webbing fastening position, the retainer means is brought into a first state wherein it can inhibit the movement of the slider toward the webbing unfastening position, and in response to the above-described relative movement which occurs when the drive means moves toward the webbing unfastening position from the webbing fastening position, ~3G~3~
the retainer means is brought into a second state wherein it allows the slider to move toward the webbing unfastening position. Accordingly, the retainer means for preventing the slider from moving when the occupant has the webbing fastened can be simplified in arrangement and reduced in size, advantageously.
The guide rail employed in this system is arranged such that an end portion thereof which is closer to the rear end of the vehicle is terminated after being bent so as to extend downward in the substantially vertical direction along a center pillar, thereby allowing the guide rail to ~3(~330 r reliably carry the tension qenerated in the webbing by the inertia which acts on the occupant's body when an emergency situation of the vehicle occurs. The guide rail arran~ed as described above needs retainer means for retaining the slider in such a manner that the slider is inhibited from moving toward the ceiling of the vehicle along the vertically extended portion of the guide rail when the vehicle overturns.
Seatbelt systems having such retainer means have already been devised wherein a sensor such as a pendulum for detecting overturn of the vehicle is provided, and the movement of the slidex is inhibited when this sensor is activated ~e.g., Japanese Patent Publication No. 15716/1985). This type of retainer means suffers, however, from the problem that, since a sensor such as a pendulum projects from the guide rail, it is necessary to form a bore in the center pillar for receiving such projecting sensor structure or provide a raised portion on the center pillar which protrudes into the compartment of the vehicle.
SUMMA~y-oF THE INVENTION
In view of the above-described circumstances, it is a primary object of the present invention to provide an automatic seatbelt system which i6 50 designed that the retainer means, which is adapted to inhibit the movement of 13~4;~30 the slider when the vehicle overturns, has a simplified arrangement and a reduced size.
To this end, the present invention provides an automatic seatbelt sy.stem for a vehicle which comprises: a guide rail laid on the body of the vehicle; a slider retaining a webbing and adapted to be movable along the guide rail between a position at which the webbing is fastened to the body of an occupant (hereinafter referred to as the ~webbing fastening positionn) and a position at which the webbing is unfastened therefrom (hereinafter referred to as the "webbing unfastening positionn); dcive means adapted to move along the guide rail in such a manner as to ~pply driving force to the slider, the drive means being movable relative to the slider by a predetermined amount along the guide rail; and retainer means adapted such that, in response to the movement of the ~lider to the webb$ng fastening position, the retainer means is brought into a f~rst state wherein it can inhibit the movement of the slider toward the webbing unfastening position, and in response to the above-described relative movement which occurs when the drive means moves toward the webbing unfastening position from the webbing fastening position, the retainer means is brought into a second state wherein it allows the slider to move toward the webbing unfastening position.
13~4330 By virtue of the above-described arrangement, when the slider is at the webbing fastening position, it is inhibited from moving along the guide rail. Thus, the retainer means need not be provided~with any special sensor means such as an acceleration sensor, so that the arrangement of the retainer means is simplified, and the size of the means is reduced.
BRI E~ nE8fBIpTI ON~5E~ LDBA~1~15 Fig. 1 is a fraqmentary side view of a vehicle to which a first embodiment of the automatic seatbelt system according to the present invention is applied, as viewed from the inside of the vehicle;
Fig. 2 is a sectional view taken along the line II-II
in Fig. 1, which shows the slider having moved to the central portion of the guide rail;
Fig. 3 is a partially fiectioned side view of an essential part of the first embodiment, which particularly shows the retainer means;
Fig. 4 is an exploded perspective view of an essential part of the arrangement shown in Fig. 3;
Fig. 5 is a sectional view taken along the line V-V in Fig. 3, which particularly shows the retainer means with the housing removed;
Fig. 6 is a partially cutaway perspective view of the housing of the retainer means;
~3~`4330 Fig. 7 is a sectional view taken along the line VII-VII
in Fig. 3;
Fig. 8 is a view employed to explain the operation of the essential part of. the first embodiment shown in Fig. 3;
Fig. 9 is a partially sectioned side view of an essential part of a second embodiment of the present invention, which particularly shows retainer means employed in the second embodiment;
Fig. 10 is a view employed to explain the operation of the retainer means shown in Fig. 9;
Fig. 11 is a partially cutaway perspective view of the retainer means of the second embodiment;
Fig. 12 is a partially sectioned side view of an essential part of a third embodiment of the present invention, which particularly shows retainer means employed in the third embodiment;
Fig. 13 is a partially sectioned side view of an essential part of a fourth embodiment of the present invention, which particularly shows retainer means employed in the fourth embodiment;
Fig. 14 is a partially sectional side view of an essential part of a fifth embodiment, which corresponds to Fig . 3 of the first embodiment;
Fig. 15 is a view employed to explain the operation of the essential part of the fifth embodiment shown in Fig. 14, ~3~4;~30 which corresponds to Fig. 8;
Fig. 16 is an exploded perspective view of the essential part of the fifth embodiment; and Fig. 17 is a cutaway perspective view of a housing of the fifth embodimet.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention will be described hereinunder in detail with reference to the accompanying drawing~.
Fig. l is a fragmentary side view of a vehicle to which a first embodiment of the seatbelt system according to the present invention is applied, as viewed from the inside of the vehicle.
~3C4;~30 The arrangement is such that, when an occupant 12 is seated in a seat 10 ~hich is on the right-hand side of the vehicle with respect to the forward direction, his body is automatically fastened with a webbing 14. The webbing 14 is wound up from one end thereof into a retractor 18 by means of a predetermined biasing force, the retractor 18 being secured to a floor member 16 in the substantially central portion of the vehicle. The retractor 18 incorporates an inertia type lock mechanism adapted to instantaneously stop the webbing 14 from being unwound when an emergency situation of the vehicle occurs.
The other end of the webbing 14 is retained by a slider 22 through an anchor plate 20. The slider 22 is adapted to be movable in the longitudinal direction of the vehicle along a quide rail 24. The guide rail 24 includes a guide rail main body 28. The central portion of the main body 28 is disposed horizontally along a roof side member 26 which constitutes a part of the side wall of the vehicle body.
The forward end portion of the guide rail main body 28 i8 slanted along a front pillar 30 and secured thereto.
The end portion of the gulde rail main body 28 on the side thereof which is closer to the rear end of the vehicle is bent at substantially right angles so as to extend toward 13~4330 the lower side of the vehicle, and secured to a center pillar 32.
As shown in Fig. 2, the guide rail main body 28 has a groove 34 which opens toward the lower side of the vehicle, thus having a substantially U-shaped cross-section as a whole. The intermediate portion of the groove 34 in the depthwise direction thereof is enlarged in width so as to receive an enlarged-width portion 36 which is formed on the intermediate enlarged portion of the slider 22. This enlarged-width portion 36 enables the slider 22 to move smoothly within the guide rall main body 28 in the longitudinal direction thereof, that is, in the longitudinal direction of the vehicle. In addition, the enlarged-width portion 36 is adapted to carry the tension applied to the webbing 14 by the occupant when the vehicle is in a normal state 80 that the slider 22 does not come off the guide rail main body 28.
The bottom portion of the groove 34 in the main body 28 is also enlarged in width to define a tape accommodating groove 38 which slidably guides a flexible tape 40, serving as drive means, in the longitudinal direction of the guide rail 24.
The flexible tape 40 is, as also shown in Fig. 4, made from a continuous thick-walled synthet~c res~n m~terial. A
plurality of openings 42 are formed in the tape 40 in such a 13~4~30 manner that they are arranged in a row at a predetermined regular spacinq alonq the longitudinal axis of the tape 40.
These openings 42 are adapted to engage with a sprocket wheel (not shown) accommodated within a housing 44 which is disposed on the lower part of the center pillar 32 as shown in Fig. 1, so that the rotational force from a motor 46 is transmitted to the tape 40 through the engagement between the sprocket wheel and the openings 42, thus causing the tape 40 to move along the longitudinal axis thereof.
Since the enlarged-width portion 36 which mainly carries the load applied from the slider 22 is disposed below the tape accommodating groove 38 within the guide rail 24 as described above, even when a relatively large load ~s applied from the slider 22, there is no fear of-the flexible tape 40 and the tape accommodating groove 38 being deformed to a substantial degree, and it is therefore possible to prevent the tape 40 from falling into an operation failure.
As ~hown in Fig. 4, an elongated opening 50 which has a longer longitudinal dimenslon than that of the openings 42 is formed in an end portion of the flex$ble tape 40 on the slde thereof which is clo~er to the front end of the vehicle. The elongated opening 50 receiveR a portion of the slider 22 which is lntermedlate between the head portion 52 and the enlarged-width portion 36. In consequence, when the flexible tape 40 moves in the longitudinal direction of the 13~4330 vehicle along the guide rail 24, the slider 22 is driven by the tape 40 and can move in the longitudinal direction of the vehicle along the guide rail 24 together with the tape 40. As shown in Fig~ 1, when the slider 22 is moved to the forward end of the guide rail 24, the slider 22 brings the webbing 14 to a position at which the webbing 14 is unfastened from the occupant's body as shown by the imaginary line (this position being hereinafter referred to as a "webbing unfastening positionn), whereby a space for the occupant 12 to enter and leave the vehicle can be deined betwen the webbing 14 and the seat 10. When the slider 22 is moved to the rear end of the guide ra~l 24 as shown by the solid line in Fig. 1, the webbing 14 is brought to a position at which it is fastened to the occupant's body (this position being hereinafter referred to as a ~webbing fastening position~), whereby the occupant 12 can automatically be fastened with the webbing 14.
As shown in Fig. 4, the longitudinal dimension L of the elongated opening 50 is made larger than the longitudinal dimension R of the head portion 52, so that, when the head portion 52 abuts against either the longitudinal edge 50A or 50B of the elongated opening 50 on the side thereof which is closer to the front or rear end of the vehicle, respectively, a space or play S is defined between the head portion 52 and the other of the two longitudinal edges of ~3~4~30 the opening 50. Accordingly, the flexible tape 40 and the slider 22 are movable relative to each other by an amount corresponding to the length of the space S, so that, even when the tape 40 is s.tarted to move, the slider 22 is not moved until the space or play S has disappeared.
Referring to Figs~ 3 to 6, a retainer means 54 is disposed on the vertically extended portion of the guide rail 24 which is defines the rear end portion thereof. The retainer.means 54 includes a hollow housing 56 which is disposed adjacent to the lower end of the guide rall ma~n body 28 and rigidly secured to the center pillar 32 through a reinforcing bracket 58. This bracket 58 has a substantially U-~haped cross-section so that it cover6 the forward end surface and two lateral side surfaces of the housing 56. The bracket 58 has mounting bores 60 provided in the end portion of each of the side walls theeeof, and mounting bolts are respectlvely received through the~e bore~
60 to rigidly secure the bracket 58 to the center pillar 32.
It should be noted that the housings 56 and 44 are connected together by a guide tube 61 which tightly accommodates the flexible tape 40.
As shown in Figs. 3 and 4, an anchor pin 62 is secured at both end portions thereof to the bracket 58 in such manner that the anchor pln 62 opposes the lntermedlate enlarged portion of the slider 22 having the enl~rged-width 13~4;~30 portion 36 formed thereon when the slider 22 is stopped at the webbing fastening position. Thus, when a relatively large tension acts on the webbing 14 at the webbing fastening position so. as to force the slider 22 to come out of the groove 34 in the guide rail main body 28, the anchor pin 62, which is located on the side of the intermediate enlar~ed portion of the slider 22 which is closer to the front end of the vehicle, engages with the enlarged-width portion 36, thereby preventing the slider 22 from coming off the guide rail main body 28.
A latch pawl 64 which is used as a locking apparatus is disposed within the housing 56 in such a manner that the pawl 64 opposes the enlarged-width portion 36 of the slider 22 when stopped at the webbing fastening position. This pawl 64 is received in a support bore 66 with a triangular cross-section which extends through the housing 56 in the lateral direction of the vehicle, and adapted to be pivotal in the direction of the arrow A about one vertex of the triangular support bore 66.
More specifically, when the pawl 64 pivots maxlmumly within the triangular support bore 66 counterclockwise as viewed in Fig. 3, the distal end of the pawl 64 is interposed in the locus of movement of a hook portion 68 provided at the distal end portion of the enlarged-width portion 36, theceby making it possible to inhibit the slider 22 f rom moving toward the upper side of the vehicle. When 13~4~30 the pawl 64 moves maximumly clockwise as shown in ~ig. 8, the distal end of the pawl 64 is withdrawn from the locus of movement of the hook portion 68, thereby allowing the slider 22 to move upward. For this purpose, the pawl 64 is baised by a torsion coil spring 70 so as to be brought into the state shown in Fig. 3, that is, in the state wherein the pawl 64 is interposed in the locus of movement of the hook portion 68. Thus, the pawl 64 and the torsion coil spring 70 constitute in combination an engagement section for engagement with the hook portion 68.
Support bores 72 are formed in the houslng 56 as shown in Fig. 6, and support shafts 76 of a ratchet member 74 shown in Fig. 4 are respectively received in the support bores 72. This ratchet member 74 is provided for the purpose of controlling the pawl 64. Two lateral end portions of ~he ratchet member 74 are bent at right angles so as to extend parallel with each other, thereby defining a pair of leg plate portions 78. The support shafts 76 are coaxially formed on the leg plate portions 78, respectively, so as to project in opposite directions. Accordingly, in assembly, the ratchet member 74 is lnserted lnto the housing 56 while the leg plate portlons 78 are being elastically deformed toward each other, whereby the support shafts 76 enter the corresponding support bores 72 by virtue of the restoring force of the leg plate portions 78, and the ~3C}4~30 ratchet member 74 is thereby pivotally supported within the housing 56.
The ratchet member 74 has a pawl portion 80 projecting from the central portion thereof in such a manner that the pawl portion 80 is able to enter the elongated opening 50 in the flexible tape 40. When the pawl portion 80 of the ratchet member 74 is within the elongated opening 50, the pawl 64 is interposed in the locus of movement of the hook portion 68 as shown in Fig. 3. However, when the pawl portion 80 is out of the elongated opening 50 as shown in Fig. 8, the ratchet member 74 causes the pawl 64 to move against the biasing force from the torsion coil spring 70 so as to be withdrawn from the locus of movement of the hook portion 68.
The pawl portion 80 of the ratchet member 74 is disposed in such a manner that it is able to enter the elonqated opening 50 when the flexible tape 40 moves to the position shown in Fig. 3 and the slider 22 consequently reaches the webbing fastening position. Accordlngly, when the tape 40 moves toward the webbing unfastening posltlon, the pawl portion 80 is caused by the rear edge 50B of the elongated opening 50 to pivot counterclockwise as viewed in Fig. 3 about the support shafts 76, thus causing the pawl 64 to move the retraction position shown in Fig. 8 before the tape 40, which is moving toward the webbing unfastening 13C~4;~30 position, makes the space or play S disappear and causes the ~lider 22 to be started to move.
Guide bores 82 are respectively provided in the leg plate portions 78 of-the ratchet member 74. The guide bores 82 respectively receive pins 86 projecting from both sldes of a slide block 84 which is received in slide grooves 83 formed inside the housing 56 and which is movable only in directions parallel to the direction of movement of the flexible tape 40. More sp2cifically, the 61ide block 84 is disposed between the pair of leg plate portions 78, and the pins 86 which coaxially pro~ect in opposite directions are respectively received in the guide bores 82 from the inside of the leg plate portions 78.
The slide block 84 is arranged such that, when the slider 22 reaches the webbing fastening posit~on, the sl~de block 84 i5 pressed and moved by the hook portion 68 as shown in Fig. 3, thus cau~ing the pins 86 to enter larger-width portions 82A (see Fig. 4) of the gulde bores 82, respectively. In this state, the pins 86 allow the ratchet member 74 to pivot from the posltion shown in Fig. 3 to the position shown in Fig. 8.
When the slider 22 is moved to the webbing unfastening position, the slide block 84 i8, as shown in Fig. 8, released from the contact with the hook portion 68 and therefore pushed out toward the slider 22 by the action of a 13(~4;~30 projecting detector element 90 of a limit switch 88 which is secured to the housing 56. This projecting detector element 90 is constantly biased so as to project from the limit switch 88 by the force from a resilient member (not shown) which is mounted inside the limit switch 88. Thus, when the detector element 90 is in its projecting position, the fact that the slider 22 is not at the webbing fastening position can be detected, whereas, when the detector element 90 is withdrawn into the limit switch 88 as shown ln Fig. 3, it is possible to detect the fact that the slider 22 is at the webbing fastening position.
Accordingly, when the slide block 84 is in the state shown in Fig. 8, it is pushed out by the projecting detector element 90, causing the pins 86 to enter smaller-width portions 82B of the guide bores 82, respectively. In consequence, the ratchet member 74 is pivoted about the support shafts 76 and held in the state shown in Flg. 8.
More specifically, the ratchet member 74 allows the pawl 64 to be held in a state wherein it is withdrawn from the locus of movement of the hook portion 68 with a margin and the pawl portion 80 to be held in a state wherein it is withdrawn from the locus of movement of the flexible tape 40 with a margin. Therefore, in the state shown in Fig. 8, when the flexible tape 40 moves along the longitud~nal axis thereof, it is prevented from contacting the pawl portion ~3(~4~30 80, and when the slider 22 moves toward the webbing unfastening position, it is prevented from contacting the pawl 64. Thus, the ratchet member 74, the slide block 84 and the projecting detector element 90 con~titute in combination a release section which allows the pawl 64 to be separated from the hook portion 68.
In order to ensure the required movement of each of the associated portions, the larger-width portion 82a of each of the guide bores 82 in the ratchet member 74 has a dimens~on which allows the pin 86 to move therein with a margin.
In addition, the slider 22 is arranged such that the enlarsed-width portion 36 is stopped by abuttinq against the inner ends 83A of the guide grooves 83 formed inside the housing 56. A cu~hioning material such as rubber may be interposed between the enlarged-width portion 36 and the end portions 83A.
The followinq is a description of the operation of the above-described embodiment.
After seating himself in the seat 10, the occupant 12 actuates a manually-operated switch. Alternatively, the fact that the occupant 12 enters the vehicle and seats himself in the seat 10 is detected by swltch means such as a switch adapted to detect whether the door i8 open or closed and a switch provided in the seat 10. In consequence, the motor 46 is activated to move the flexible tape 40 toward ~3a4;~30 the rear end of the vehicle. This movement of the tape 40 causes the webbing 14 to n~ove from the webbing unfastening position shown by the imaginary line in Fig. 1 to the webbing fastening position shown by the solid line so as to be automatically fastened to the body of the occupant 12.
The slider 22 is driven to move toward the rear end of the vehicle while abutting against the forward edge SOA of the elongated opening 50 formed in the tape 40 with a space or play S defined between the head portion 52 and the rear edge 50B of the opening S0.
Near the stroke end of the slider 22, it moves downward from the position shown in Fig. 8. In consequence, the hook portion 68 of the slider 22 forces the projecting detector element 90 into the limit switch 88 through the sllde block 84 as shown in Fig. 3. Thus, the limit switch 88 detects the fact that the slider 22 has reached the webbing fastening position, and control means (not shown) suspends the rotation of the motor 46.
The slide block 84 thus moved by the hook portion 68 causes the pins 86 to move to the larger-width portions 82A
from the smaller-width portions 82B, respectively, thus allowing the ratchet member 74 to pivot. In consequence, the pawl 64, which has been moved to and held at the retraction position by the ratchet member 74, causes the ratchet member 74 to pivot clockwise by virtue of the ~3~P4;~30 biasing force from the torsion coil spring 70, thereby bringing the ratchet member 74 into the state shown in Fig. 3. At the same time, the pawl 64 is interposed in the locus of movement of the hook portion 68 and enters the recess on the side of the hook portion 68 which is closer to the upper side of the vehicle as shown in Flg. 3.
Accordingly, the slider 22 is inhibited from moving toward the upper side of the vehicle. In addition, the ratchet member 74 pivots clockwise as viewed in Fig. 3, and the pawl portion 80 enters the space S defined in the elongated opening 50.
When the vehicle is in a normal state, the webbing 14 can be unwound from the retractor 18; therefore, the occupant 12 can assume any desired driving posture.
When the vehicle runs into an emergency situat$on, the retractor 18 stops the webbinq 14 from being unwound, so that the body of the occupant 12 is restrained by the webbing 14.
In an emergency situation of the vehicle, a relatively large tension is generated in the webbing 14 by the inertia which acts on the occupant's body, and transmitted to the slider 22 through the anchor plate 20. However, since the anchor pin 62 is diposed in opposing relation to the slider 22, the slider 22 is reliably supported by the vehicle body through the bracket 58.
~3~4;~30 When the vehicle overturns, the hook portion 68 of the slider 22 is also inhibited by the pawl 64 from moving toward the upper side of the vehicle. There is therefore no fear of the slider 22 moving toward the ceiling of the vehicle.
In the case where the occupant 12 leaves the vehicle upon the completion of a normal drive, when he opens the door, the control means activates the motor 46 to rotate in reverse.
Accordinqly, the flexible tape 40 is moved toward the front end of the vehicle within the guide rail main body 28.
At this time, even when the tape 40 moves from the position shown in Fig. 3, the slider 22 is not moved until the rear edge 50B of the elongated opening 50 abuts against the slider 22. Before the rear edge 50B abuts against the slider 22, the relative movement between the tape 40 and the slider 22 causes, through the opening 50, the ratchet member 74 to pivot counterclockwise as viewed in Fig. 3 about the support shafts 76. This movement of the ratchet member 74 causes the pawl 68 to pivot from the position shown in Fiq. 3 to the position shown in ~ig. 8 so as to be withdrawn from the locus of movement of the hook portion 68.
Accordingly, the slider 22 is released and allowed to move toward the front end of the vehicle together with the flexible tape 40 when the rear edge 50B of the e~ongated 13~4~30 opening 50 abuts against the slider 22 and thereby causes the latter to be started to move.
When the slider 22 which is driven by the tape 40 reaches the front end of the vehicle as shown in Fig. 1, a limit switch (not shown) is activated so as to suspend the rotation of the motor 46, thereby allowing the webbing 14 to be automatically unfastened from the body of the occupant 12.
During such movement of the flexible tape 40, the slide block 84,~which has been released from the contact with the slider 22, is pushed up by the projecting detector element 90 of the limit switch 88 as shown in Fig. 8. Consequently, the pawl portion 80 of the ratchet member 74 is separated from the tape 40, and there is therefore no fear of the pawl portion 80 contacting the edges of the openings 42 to generate noise when the tape 40 is moved.
In addition, the ratchet member 74 holds the pawl 64 ~n a state wherein it is withdrawn from the locus of movement of the hook portion 68 with a margin. There is therefore no risk of the pawl 64 interfering with the hook portion 68 when the slider 22 is moved.
When the occupant 12 opens the door thereafter in order to re-enter the vehicle, the same operation as that which has already been described takes place. Namely, after the occupant 12 has been seated, the slider 22 i6 moved toward 13~4~30 the rear end of the vehicle again, thereby allowing the webbing 14 to be automatically fastened to the occupant' body.
Referring next to Figs. 9 to 11, there is ~hown a second embodiment of the present invention. In this embodiment, the slide block 84 and the pawl 64 which are employed in the above-described embodiment are omitted, and a pin 92 is stretched between the leg plate portions 78 of the ratchet member 74 so as to serve as a member similar to the pawl 64 in the first embodiment. Both ends of the pin 92 project from the leg plate portions 78 and are respectively received in Elots 93 formed ln the housing 56, thereby limiting the angle of rotation of the ratchet member 74.
In addition, a spr~ng retainer pin 94 project~ from the inner slde of each of the leg plate portions 78 of the ratchet member 74, and a tenslon coil spring 98 i8 stretched be~ween the pin 94 and a spring retainer pin 96 which projects from each of the opposing inner sides of the housing 56. Thi6 tension coil spring 98 i8 a turnover spring which causes the ratchet member 74 to perform snap action. More fipecifically, when the axis of the ten~ion coil spring 98 is positioned closer to the flexible tape 40 than the prolongation of the axes of the support shaft6 76, the spring 98 biasefi the ratchet member 74 80 as to pivot ~3~4;~30 clockwise as viewed in Fig. 9, whereas, when the axi~ of the spring 98 is shifted passing the prolongation of the axes of the support shafts 76 in a direction in which it is separated from the tape 40, the spring 98 biases the ratchet member 74 so as to pivot counterclockwise as viewed in Fig. 9, thereby allowing the ratchet member 74 to pivot to the position shown in Fig. 10.
In addition, when the pawl portion 80 of the ratchet member 74 which is within the elongated opening 50 as shown in Fig. 9 is caused to pivot counterclockwise as viewed in Fig. 8 by the front edge 50A of the opening S0 when the flexible tape 40 is moved, the ratchet member 74 causes the axis of the tension coil spring 98 to pass its neutral point defined by the prolongation of the axes of the support shafts 76 and move to the other side, thereby allowing the ratchet member 74 to move to the position shown in Fig. 10 by the action of the spring 98.
In the case where the ratchet member 74 is maximumly pivoted counterclockwise by the biasing force from the tension coil spring 98 as shown in Fig. 10, when the slider 22 is moved to the webbing fastening position, the enlarged-width portion 36 of the slider 22 abuts againt the ratchet member 74 and causes the latter to pivot clockwi6e as viewed in Fig. 10. In consequence, the axis of the tension coil spring 98 passes the prolongation of the axes of the support 13G~;~30 shafts 76, and this also forces the ratchet member 74 to pivot clockwise, thus allowing the pawl portion 80 to enter the elongated opening 50.
Accordingly, in this embodiment also, when the slider 22 is at the webbing fastening position as shown in Fig. 9, the pawl portion 80 of the ratchet member 74 is within the elongated opening 50, and the pin 92 is disposed on the side of the the hook portion 68 which is closer to the upper side of the vehicle, whereby it is possible to prevent the slider 22 from moving accidentally or undesirably. When the flexible tape 40 is moved toward the webbing unfastening position, the pawl portion 80 is pushed down by the rear edge 50B of the elongated opening 50 to the position shown in Fig. lO. Therefore, the pin 92 is withdrawn from the locus of movement of the hook portion 68 before the space or place S defined ~n the elongated opening 50 of the tape 40 disappears and the tape 40 consequently causes the slider 22 to be started to mobe, thereby allowing the slider 22 to move. Since, in this sate, the pawl portion 80 ha~ already been separated from the tape 40 at an adequate spacing, there is no fear of the pawl portion 80 abutting againt the edges of the openings 42 in the take 40.
It should be noted that the tension coil spring 98 in this embodiment may be disposed in such a manner that it constantly biases the ratchet member 74 so as to pivot 13(~4;~30 clockwi~e as viewed in Figs. 9 and 10. In such case, the width A of the pawl portion 80 1R made larger than the width B of the openings 42 in the tape 40 80 that there iB no fear of the pawl portion 80 entering the openings 42 to generate noi~e when the flexible tape 40 i6 moved.
Referring next to Fig. 12, there i8 shown a third embodiment of the present invention. The ratchet member 74 in this embodiment has an arrangement substantlally similar to that in the second embodiment. In this embodiment, however, the ratchet member 74 ha~ an arm 102 which projects from a position in the vicinity of the support shaft~ 76 ~o as to oppose a leaf spring 104 which ls secured at one end thereof to the housing 56. A pair of recesses 106 and 108 are formed in the intermediate portlon of the leaf ~pring 104 in such a manner tha~ each of the rece~ses 106 and 108 is able to accommodate the distal end of the arm 102, thereby controlling the pivoting motion of the ratchet member 74.
Thus, when the ratchet member 74 abuts against the enlarged-width portion 36 of the slider 22 which is moved downward, the ratchet member 74 is able to move from the position shown by the solid line in Fig. 12 in which the pin 92 is withdrawn from the locus of movement of the hook portion 68 to the position shown by the phantom line in which the pawl portion 80 is within the elongated opening 50 13~4;~3~
in the flexible ~ape 40. ~rhus the ratchet member 74 in thi~
embodiment performs an action similar to that in the above-described embodiments.
In this embodiment, when the ratchet member 74 which i6 in the position shown by ~he imaginary line is pivoted counterclockwise to come close to the position shown by the solid line, the arm 102 of the ratchet member 74 i8 biased by the leaf spring 104 so as to turn and enter the recess 106 thanks to the configuration of the recess 106. In consequence, the arm 102 is moved into the recess 106.
Thus, when the ratchet member 74 is in the position shown by the solid line, the pawl portion 80 can be held in a state wherein it is separated from the flexible tape 40.
Fig. 13 shows a fourth embodiment of the present invention.
In this embodiment, a torsion coil sping 110 serves as both the ratchet member 74 and the pawl 64 in the fir~t embodiment.
More specifically, a coil portion 110A formed on the intermediate portion of the spring 110 i8 rotatably supported on a spring retainer pro~ection 114 which i8 rigidly secured to the housinq 56. One end portion of the ~pring 110 is retained by a retainer pro~ection 116. A coil portion 110B which is adjacent to the coil portion 110A i8 dispo~ed in such a manner a~ to hold the pin 92. The other 13~ 3~
end portion of the spring 110 ~s bent to define a ratchet portion llOC which serves as a member similar to the ratchet member 74 in the above-described embodiments.
Therefore, in this embodiment, when the slider 22 is in the position shown in Fig. 13, the ratchet portion llOC i8 within the elongated opening 50, and the pin 92 i5 interposed in the locus of movement of the hook portion 68.
When, in this state, the slider 22 is moved toward the webbing unfastening position, the ratchet portion llOC is expelled from the elongated opening 50. In confiequence, the torsion coil spring llO is forced to pivot counterclockwise as viewed in Fig. 13 about the coil portlon llOA so as to be elastically deformed, thereby causing the coil portion llOB
and the pin 92 to be withdrawn from the locu~ of movement of the hook portion 68, and thus allowing the movement of the slider 22.
After the slider 22 has moved, the ratchet portion llOC
which ~s pressed by the flexible tape 40 holds the pin 92 out of the locus of movement of the hook portion 68.
However, when the slider 22 returns to the webbing fastening posit$on shown in Fig. 12, the ratchet port$on llOC enters the elongated opening 50, so that the pin 92 is interposed in the locus of movement of the hook portion 68 aga~n.
In this case, the length A of the ratchet portion llOC
is preferably made so large that it cannot enter the openings 42 in the flexible tape 40.
~3(~4~30 A fifth em~odiment ol ~he present invention is silowrl in Figs~ 14 through 17. In this embodiment, the slide block ~4 and the latch pawl ~ use(~in the first embodiment are omitted, but a lock pin 570 is provided between leg plates 78 of a ratchet member 74A, and the lock pin 570 is able to be made of metal or the like. The lock pin 570 is engageable with the hook portion 68 as the same manner in the second embodiment shown in Figs. 3 through Fig. 11.
A control pin 580 provided to a detector element 578 of a limit switch 576 is inserted in a guide bore 82 of the ratchet member 74A. The detector element 578 is longitudinally slidably disposed to the limit switch 576 through a hole formed in a housing 56A, and the control pin 580 is transversely extended from the detector element 578.
In this embodiment, as shown in Figs. 14 and 15, a compressed coil spring 575 urges a pawl 80 of the ratchet member 74A to a direction of the flexible tape 40.
Accordingly, in the embodiment, as the slider 22 pushes in the detector element 578 to the limit switch 576 at a stroke end portion resistant to a spring member which is not shown in the drawings, but provided in the limit switch 576, a driving motor for the flexible tape is stopped by the limit switch, and the control pin 580 is inserted in a larger width portion 82A of the guide bore 82 of the ratchet member 74A, and then a pawl portion 80 of the ratchet member 74A is gotten into the longitudinal opening 50 of the flexible tape ~y the urginq force of the coil ; 2~
~3(~4;~30 spring 575.
At this condition, even though external force is upward added to the slider 22 from the webbing 14 in Fig.
14, the external force is received by the body of the vehicle through the housing 56A and projected portions 559 of a bracket 58A.
At the time of automatically setting the webbing to an occupant, referring Fig. 14, when the flexible tape 40 is upward driven, the pawl portion 80 is withdrawn by the flexible tape 40 from the locus of movement thereof, and the pin 570 is disengaged from the hook portion of the slider 22, then the slider 22 is delayingly moved in accordance with the relative movement with the flexible tape 40. At this stage, the control pin 580 of the detector element 578 is slidingly received in a smaller width portion 82B of the guide bore 82, and the ratchet member 74A is prevented from pivotal movement.
The pin 570 is not limited to around shape in a cross-sectional view, and can be formed to any shape.
Moreover, the pin 570 can integrally formed with the ratchet member 74A by diecasting. The compressed coil spring 575 can be replaced with any other leaf spring or the like.
The anchor pin 62 used in each embodiments can be omitted, and substitutionally the bracket 58 is able to be constituted so as to receive by itself the large force of the webbing 14 which may occur in the emergency of the vehicle.
13~330 It should be noted that the drive means employed in the present invention is not necessarily limitative to a continuous member su~h as a flexible tape, and any other type of drive means may be employed.
As has been described above, the automatic seatbelt system for a vehicle according to the present invention comprises: a guide rail laid on the body of the vehicle; a slider retaining a webbing and adapted to be movable along the guide rail between a position at which the webbing is fastened to the body of an occupant (hereinafter referred to as a "webbing fastening position~) and a position at which the webbing is unfastened therefrom (hereinafter re~erred to as a "webbing unfastening position~); drive means adapted to move along the guide rail in such a manner as to apply driving force to the slider, the drive means being movable relative to the slider by a predetermined amount along the guide rail; and retainer means adapted such that, in response to the movement of the slider to the webbing fastening position, the retainer means is brought into a first state wherein it can inhibit the movement of the slider toward the webbing unfastening position, and in response to the above-described relative movement which occurs when the drive means moves toward the webbing unfastening position from the webbing fastening position, ~3G~3~
the retainer means is brought into a second state wherein it allows the slider to move toward the webbing unfastening position. Accordingly, the retainer means for preventing the slider from moving when the occupant has the webbing fastened can be simplified in arrangement and reduced in size, advantageously.
Claims (34)
1. An automatic seatbelt system for a vehicle, which comprises:
(a) a guide rail attached along the body of the vehicle;
(b) a slider for retaining a webbing and adapted to be movable along said guide rail between a position at which said webbing is fastened to the body to an occupant and a position at which said webbing is unfastened therefrom;
(c) drive means having a longitudinal opening for receiving a part of the slider and which is disposed in said guide rail for applying a driving force to said slider, said slot being dimensioned so that the drive means is slidably movable relative to said slider by a predetermined amount along said guide rail; and (d) retainer means for releasably retaining said slider in a webbing fastening position, said retaining means including a head provided on the slider and slidably engaged in the longitudinal opening of the driving means, a hook portion formed at an end of the slider, a locking apparatus disposed opposite to the hook portion having an engagement section for releasable engagement therewith, and a ratchet member receivable within said longitudinal opening for actuating said engagement section into and out of engagement with said hook portion, said retainer means being adapted such that, in response to the movement of said slider to said webbing fastening position, said retainer means is brought into a first state wherein it can inhibit the movement of said slider toward said webbing unfastening position, and in response to said slidable relative movement which occurs between said slider and said driver means when said drive means moves toward said webbing unfastening position from said webbing fastening position, said retainer means is brought into a second state wherein it allows said slider to move toward said webbing unfastening position, whereby, when said slider is at said webbing fastening position, it is inhibited from moving along said guide rail, and wherein said drive means prevents said retainer means from engaging the slider when said slider is unfastened.
(a) a guide rail attached along the body of the vehicle;
(b) a slider for retaining a webbing and adapted to be movable along said guide rail between a position at which said webbing is fastened to the body to an occupant and a position at which said webbing is unfastened therefrom;
(c) drive means having a longitudinal opening for receiving a part of the slider and which is disposed in said guide rail for applying a driving force to said slider, said slot being dimensioned so that the drive means is slidably movable relative to said slider by a predetermined amount along said guide rail; and (d) retainer means for releasably retaining said slider in a webbing fastening position, said retaining means including a head provided on the slider and slidably engaged in the longitudinal opening of the driving means, a hook portion formed at an end of the slider, a locking apparatus disposed opposite to the hook portion having an engagement section for releasable engagement therewith, and a ratchet member receivable within said longitudinal opening for actuating said engagement section into and out of engagement with said hook portion, said retainer means being adapted such that, in response to the movement of said slider to said webbing fastening position, said retainer means is brought into a first state wherein it can inhibit the movement of said slider toward said webbing unfastening position, and in response to said slidable relative movement which occurs between said slider and said driver means when said drive means moves toward said webbing unfastening position from said webbing fastening position, said retainer means is brought into a second state wherein it allows said slider to move toward said webbing unfastening position, whereby, when said slider is at said webbing fastening position, it is inhibited from moving along said guide rail, and wherein said drive means prevents said retainer means from engaging the slider when said slider is unfastened.
2. An automatic seatbelt system according to Claim 1, wherein said drive means includes a continuous member accommodated in said guide rail and movable in the longitudinal direction thereof, said continuous member having said elongated opening adapted to receive a part of said slider in order to apply driving force thereto.
3. An automatic seatbelt system according to Claim 2, wherein said retainer means has an engagement section adapted such that, when said slider is at said webbing fastening position, said engagement section is moved by means of biasing force so as to be interposed in the locus of movement of said hook portion, thereby inhibiting said slider from moving toward said webbing unfastening position.
4. An automatic seatbelt system according to Claim 3, wherein said retainer means further has a release section adapted to cause said engagement section to move out of the locus of movement of said hook portion against the biasing force in response to the relative movement occurring when said continuous member moves toward said webbing unfastening position, thereby allowing said slider to move toward said webbing unfastening position.
5. An automatic seatbelt system according to Claim 4, wherein said retainer means further includes a hollow housing disposed at an end of said guide rail on the side thereof which is closer to said webbing fastening position, said engagement section including a latch pawl pivotally supported within the hollow portion of said housing and a spring adapted to bias said latch pawl so as to be interposed in the locus of movement of said hook portion.
6. An automatic seatbelt system according to Claim 5, wherein said release section includes a ratchet member pivotally supported within the hollow portion of said housing and contacting said pawl at a part thereof, said ratchet member having a pawl portion adapted to enter said elongated opening in said continuous member through said ratchet member which is pressed by said latch pawl when said slider is at said webbing fastening position, said pawl portion being pressed against one longitudinal edge of said elongated opening in response to the relative movement occurring between said slider and said continuous member when moving toward said webbing unfastening position, causing said ratchet member to pivot so as to move said latch pawl out of the locus of movement of said hook portion.
7. An automatic seatbelt system according to Claim 6, wherein said release section further includes a slide block supported by said ratchet member in such a manner as to be movable along the direction of movement of said continuous member and biased by means of biasing force toward said webbing unfastening position, said slide block being adapted such that, when it is pressed by said slider so as to move toward said webbing fastening position, said slide block allows said ratchet member to pivot, thus permitting said latch pawl to be moved by means of the biasing force of said spring so as to be interposed in the locus of movement of said hook portion, while the pawl portion of said ratchet member enters said elongated opening, whereas, when said slider is moved from said webbing fastening position toward said webbing unfastening position, said slide block is shifted toward said webbing unfastening position to hold said latch pawl out of the locus of movement of said hook portion through said ratchet member.
8. An automatic seatbelt system according to Claim 2, wherein said retainer means has a hollow housing disposed at an end of said guide rail on the side thereof which is closer to said webbing fastening position, a ratchet member pivotally supported within the hollow portion of said housing and provided with a pin and a pawl portion, and biasing means adapted such that, when said slider presses said ratchet member, said biasing means causes said ratchet member to pivot in one direction so as to interpose said pin in the locus of movement of said hook portion, thereby inhibiting said slider from moving toward said webbing unfastening position, whereas, when said continuous member moves from said webbing fastening position relative to said slider and said pawl portion is thereby pressed by a longitudinal edge of said elongated opening, said biasing means causes said ratchet member to pivot in the other direction so as to move said pin out of the locus of movement of said hook portion, thereby allowing said slider to move toward said webbing unfastening position.
9. An automatic seatbelt system according to Claim 8, wherein said biasing means is a tension coil spring adapted such that the direction of the biasing force which is applied to said ratchet member therefrom is reversed about the pivot point of said ratchet member which defines a neutral point.
10. An automatic seatbelt system according to Claim 8, wherein said biasing means is a leaf spring abutting against an arm which is provided on said ratchet member in such a manner as to extend from a position near the pivot point thereof.
11. An automatic seatbelt system according to Claim 2, wherein said retainer means has: a hollow housing disposed at an end of said guide rail on the side thereof which is closer to said webbing fastening position; a torsion coil spring disposed within the hollow portion of said housing, one end of said spring being retained by said housing, the other end of said spring being bent to define a ratchet portion, and the intermediate portion of said spring being coiled to define a coil portion; and a pin disposed within said coil portion and movable along a guide groove formed in said housing, said pin being adapted such that, when it is pressed by said slider, said pin is moved and interposed in the locus of movement of said hook portion by virtue of the elastic deformation of said torsion coil spring, thereby inhibiting said slider from moving toward said webbing unfastening position, whereas, when said continuous member moves from said webbing fastening position relative to said slider and said ratchet portion is thereby pressed by a longitudinal edge of said elongated opening, said pin is moved out of the locus of movement of said hook portion, thereby allowing said slider to move toward said webbing unfastening position.
12. An automatic seatbelt system for a vehicle designed to restrain the body of an occupant when an emergency situation of the vehicle occurs, which comprises:
(a) a guide rail attached along the body of the vehicle;
(b) a slider retaining a webbing and adapted to be movable along said guide rail between a position at which said webbing is fastened to the occupant's body and a position at which said webbing is unfastened therefrom;
(c) a flexible continuous member accommodated in said guide rail and movable along the longitudinal axis thereof by means of driving force, said continuous member having an longitudinally elongated opening adapted to receive a part of said slider in order to apply driving force to said slider, said opening having a longitudinal dimension which allows said continuous member to move relative to said slider by a predetermined amount;
(d) retainer means for releasably retaining said slider in a webbing fastening position, including a head provided on the slider and slidably engaged in the elongated opening of the flexible continuous member, a hook formed at an end of the slider, a locking apparatus provided oppositely to the hook to releasably engage therewith, and a ratchet member receivable within said longitudinal opening for actuating said locking apparatus into and out of engagement with said hook, said retainer means being adapted such that, in response to the movement of said slider to said webbing fastening position, said retainer means is brought into a first state wherein it can inhibit the movement of said slider toward said webbing unfastening position, and in response to said movement of said continuous member relative to said slider which occurs when said continuous member moves from said webbing fastening position toward said webbing unfastening position, said retainer means is brought into a second state where it allows said slider to move toward said webbing unfastening position, whereby, when said slider is at said webbing fastening position, it is inhibited from moving along said guide rail, and wherein said drive means prevents said retainer means from engaging the slider when said slider is unfastened.
(a) a guide rail attached along the body of the vehicle;
(b) a slider retaining a webbing and adapted to be movable along said guide rail between a position at which said webbing is fastened to the occupant's body and a position at which said webbing is unfastened therefrom;
(c) a flexible continuous member accommodated in said guide rail and movable along the longitudinal axis thereof by means of driving force, said continuous member having an longitudinally elongated opening adapted to receive a part of said slider in order to apply driving force to said slider, said opening having a longitudinal dimension which allows said continuous member to move relative to said slider by a predetermined amount;
(d) retainer means for releasably retaining said slider in a webbing fastening position, including a head provided on the slider and slidably engaged in the elongated opening of the flexible continuous member, a hook formed at an end of the slider, a locking apparatus provided oppositely to the hook to releasably engage therewith, and a ratchet member receivable within said longitudinal opening for actuating said locking apparatus into and out of engagement with said hook, said retainer means being adapted such that, in response to the movement of said slider to said webbing fastening position, said retainer means is brought into a first state wherein it can inhibit the movement of said slider toward said webbing unfastening position, and in response to said movement of said continuous member relative to said slider which occurs when said continuous member moves from said webbing fastening position toward said webbing unfastening position, said retainer means is brought into a second state where it allows said slider to move toward said webbing unfastening position, whereby, when said slider is at said webbing fastening position, it is inhibited from moving along said guide rail, and wherein said drive means prevents said retainer means from engaging the slider when said slider is unfastened.
13. An automatic seatbelt system according to Claim 12, wherein said retainer means has an engagement section adapted such that, when said slider is at said webbing fastening position, said engagement section is moved by means of biasing force so as to be interposed in the locus of movement of said hook portion, thereby inhibiting said slider from moving toward said webbing unfastening position.
14. An automatic seatbelt system according to Claim 13, wherein said retainer means further has a release section adapted to cause said engagement section to move out of the locus of movement of said hook portion against the biasing force in response to the relative movement occurring when said continuous member moves toward said webbing unfastening position, thereby allowing said slider to move toward said webbing unfastening position.
15. An automatic seatbelt system according to Claim 14, wherein said retainer means further includes a hollow housing disposed at an end of said guide rail on the side thereof which is closer to said webbing fastening position, said engagement section including a latch pawl pivotally supported within the hollow portion of said housing and a spring adapted to bias said pawl so as to be interposed in the locus of movement of said hook portion.
16. An automatic seatbelt system according to Claim 15, wherein said release section includes said ratchet member pivotally supported within the hollow portion of said housing and contacting said latch pawl at a part thereof, said ratchet member having a pawl portion which is adapted to enter said elongated opening in said continuous member through said ratchet member which is pressed by said pawl when said slider is at said webbing fastening position, said pawl portion being pressed against one longitudinal edge of said elongated opening in response to the relative movement occurring between said slider and said continuous member when moving toward said webbing unfastening position, causing said ratchet member to pilot so as to move said pawl out of the locus of movement of said hook portion.
17. An automatic seatbelt system according to Claim 16, wherein said release section further includes a slide block supported by said ratchet member in such a manner as to be movable along the direction of movement of said continuous member and biased by means of biasing force toward said webbing unfastening position, said slide block being adapted such that, when it is pressed by said slider so as to move toward said webbing fastening position, said slide block allows said ratchet member to pivot, thus permitting said latch pawl to be moved by means of the biasing force of said spring so as to be interposed in the locus of movement of said hook portion, while the pawl portion of said ratchet member enters said elongated opening, whereas, when said slider is moved from said webbing fastening position toward said webbing unfastening position, said slide block is shifted toward said webbing unfastening position to hold said latch pawl out of the locus of movement of said hook portion through said ratchet member.
18. An automatic seatbelt system according to Claim 12, wherein said retainer means has a hollow housing disposed at an end of said guide rail on the side thereof which is closer to said webbing fastening position, said ratchet member being pivotally supported within the hollow portion of said housing and provided with a pin and a pawl portion, and biasing means adapted such that, when said slider presses said ratchet member, said biasing means causes said ratchet member to pivot in one direction so as to interpose said pin in the locus of movement of said hook portion, thereby inhibiting said slider from moving toward said webbing unfastening position, whereas, when said continuous member moves from said webbing fastening position relative to said slider and said pawl portion is thereby pressed by a longitudinal edge of said elongated opening, said biasing means causes said ratchet member to pivot in the other direction so as to move said pin out of the locus of movement of said hook portion, thereby allowing said slider to move toward said webbing unfastening position.
19. An automatic seatbelt system according to Claim 18, wherein said biasing means is a tension coil spring adapted such that the direction of the biasing force which is applied to said ratchet member therefrom is reversed about the pivot point of said ratchet member which defines a neutral point.
20. An automatic seatbelt system according to Claim 18, wherein said biasing means is a leaf spring abutting against an arm which is provided on said ratchet member in such a manner as to extend from a position near the pivot point thereof.
21. An automatic seatbelt system according to Claim 12, wherein said retainer means having: a hollow housing disposed at an end of said guide rail on the side thereof which is closer to said webbing fastening position; a torsion coil spring disposed within the hollow portion of said housing, one end of said spring being retained by said housing, the other end of said spring being bent to define said ratchet portion, and the intermediate portion of said spring being coiled to define a coil portion; and a pin disposed within said coil portion and movable along a guide groove formed in said housing, said pin being adapted such that, when it is pressed by said slider, said pin is moved and interposed in the locus of movement of said hook portion by virute of the elastic deformation of said torsion coil spring, thereby inhibiting said slider from moving toward said webbing unfastening position, whereas, when said continuous member moves from said webbing fastening position relative to said slider and said ratchet portion is thereby pressed by a longitudinal edge of said elongated opening, said pin is moved out of the locus of movement of said hook portion, thereby allowing said slider to move toward said webbing unfastening position.
22. An automatic seatbelt system for a vehicle, comprising:
(a) a guide rail connected along the body of the vehicle;
(b) a slider for retaining a webbing which is slidably connected to the guide rail and movable between a webbing fastening position and a webbing unfastening position;
(c) a drive means connected to the slider for moving said slider along said guide rail between said webbing fastening and webbing unfastening positions, wherein said slider is movably connected to a slot in said drive means and capable of sliding a preselected amount with respect to said slot, and (d) a retainer means having a locking mechanism for detachably engaging said slider in said webbing fastening position, and a ratchet member receivable within said slot for actuating said locking mechanism into and out of engagement with said slider, wherein said locking mechanism is actuated to engage and disengage said slider as a result of the slidable movement between said slider and said slot in said drive means.
(a) a guide rail connected along the body of the vehicle;
(b) a slider for retaining a webbing which is slidably connected to the guide rail and movable between a webbing fastening position and a webbing unfastening position;
(c) a drive means connected to the slider for moving said slider along said guide rail between said webbing fastening and webbing unfastening positions, wherein said slider is movably connected to a slot in said drive means and capable of sliding a preselected amount with respect to said slot, and (d) a retainer means having a locking mechanism for detachably engaging said slider in said webbing fastening position, and a ratchet member receivable within said slot for actuating said locking mechanism into and out of engagement with said slider, wherein said locking mechanism is actuated to engage and disengage said slider as a result of the slidable movement between said slider and said slot in said drive means.
23. An automatic seatbelt system for a vehicle comprising:
(a) a guide rail attached along the body of the vehicle;
(b) a slider for retaining a webbing and adapted to be movable along said guide rail between a position at which said webbing is fastened to the body to an occupant and a position at which said webbing is unfastened therefrom;
(c) drive means disposed to engage with said slider so that the drive means is slidably movable relative to said slider by a predetermined amount along said guide rail; and (d) retainer means for releasably retaining said slider in a webbing fastening position, said retainer means including a head provided on the slider and slidably engaged with the driving means, a hook portion formed at an end of the slider, a locking apparatus disposed opposite to the hook portion for releasable engagement therewith, and a ratchet member pivotably disposed and having said locking apparatus and a pawl being engageable with said driving means for actuating said locking apparatus into and out of engagement with said hook portion, said retainer means being adapted such that, in response to the movement of said slider to said webbing fastening position, said retainer means is brought into a first state wherein it can inhibit the movement of said slider toward said webbing unfastening position, and in response to said slidable relative movement which occurs between said slider and said driver means when said drive means moves toward said webbing unfastening position from said webbing fastening position, said retainer means is brought into a second state wherein it allows said slider to move toward said webbing unfastening position, whereby, when said slider is at said webbing fastening position, it is inhibited from moving along said guide rail, and wherein said drive means prevents said retainer means from engaging the slider when said slider is unfastened.
(a) a guide rail attached along the body of the vehicle;
(b) a slider for retaining a webbing and adapted to be movable along said guide rail between a position at which said webbing is fastened to the body to an occupant and a position at which said webbing is unfastened therefrom;
(c) drive means disposed to engage with said slider so that the drive means is slidably movable relative to said slider by a predetermined amount along said guide rail; and (d) retainer means for releasably retaining said slider in a webbing fastening position, said retainer means including a head provided on the slider and slidably engaged with the driving means, a hook portion formed at an end of the slider, a locking apparatus disposed opposite to the hook portion for releasable engagement therewith, and a ratchet member pivotably disposed and having said locking apparatus and a pawl being engageable with said driving means for actuating said locking apparatus into and out of engagement with said hook portion, said retainer means being adapted such that, in response to the movement of said slider to said webbing fastening position, said retainer means is brought into a first state wherein it can inhibit the movement of said slider toward said webbing unfastening position, and in response to said slidable relative movement which occurs between said slider and said driver means when said drive means moves toward said webbing unfastening position from said webbing fastening position, said retainer means is brought into a second state wherein it allows said slider to move toward said webbing unfastening position, whereby, when said slider is at said webbing fastening position, it is inhibited from moving along said guide rail, and wherein said drive means prevents said retainer means from engaging the slider when said slider is unfastened.
24. An automobile seatbelt system according to Claim 23, wherein said locking apparatus is a pin disposed on said ratchet member.
25. An automobile seatbelt system according to Claim 24, wherein said pin is secured between leg plate portions of said ratchet member.
26. An automatic seatbelt system according to Claim 23, wherein said drive means includes a continuous member accommodated in said guide rail and movable in the longitudinal direction thereof, and said continuous member has an elongated opening for receiving a part of said slider in order to apply driving force thereto.
27. An automatic seatbelt system according to Claim 26, said pawl of the ratchet member is engageable in said elongated opening.
28. An automatic seatbelt system according to Claim 24, wherein said ratchet member is adapted such that, when said slider is at said webbing fastening position, said ratchet member is moved by means of biasing force so as to position said pin in the locus of movement of said hook portion for engaging therebetween, thereby inhibiting said slider from moves toward said webbing unfastening position.
29. An automatic seatbelt system according to Claim 28, wherein said retainer means further has a release section adapted to cause said pin to move out of the locus of movement of said hook portion against the biasing force in response to the relative movement occurring when said continuous member moves toward said webbing unfastening position, thereby allowing said slider to move toward said webbing unfastening position.
30. An automatic seatbelt system according to Claim 29.
wherein said retainer means further includes a hollow housing disposed at an end of said guide rail on the side thereof which is closer to said webbing fastening position, said ratchet member is pivotally supported within the hollow portion of said housing and a spring adapted to bias said ratchet member so as to move the pawl in the locus of movement of said hook portion.
wherein said retainer means further includes a hollow housing disposed at an end of said guide rail on the side thereof which is closer to said webbing fastening position, said ratchet member is pivotally supported within the hollow portion of said housing and a spring adapted to bias said ratchet member so as to move the pawl in the locus of movement of said hook portion.
31. An automatic seatbelt system according to Claim 23, further comprising limit switch means having a detector element and a control pin provided on said detector element, and guide bore means formed to said ratchet member, said control pin of the limit switch means is slidably disposed in said guide bore, and movement of said ratchet member is controlled by relative positions of said control pin and guide bore for engaging or releasing both the locking pin and hook portion.
32. An automatic seatbelt system according to Claim 31, wherein said guide bore means has a larger width portion where said control pin is situated, then said ratchet member is pivotably movable, and a smaller width portion where said control pin is situated, then said ratchet is prevented from pivotable movement.
33. An automatic seatbelt system according to Claim 31, wherein said detector element is axially movable with contact to said slider through said ratchet member.
34. An automatic seatbelt system according to Claim 33, wherein said control pin is rectangularly extended from said detector element.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986187321U JPH0537725Y2 (en) | 1986-12-04 | 1986-12-04 | |
| JP61-187321 | 1986-12-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1304330C true CA1304330C (en) | 1992-06-30 |
Family
ID=16203962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000553108A Expired - Fee Related CA1304330C (en) | 1986-12-04 | 1987-11-30 | Automatic seatbelt system for vehicle |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH0537725Y2 (en) |
| CA (1) | CA1304330C (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS603147B2 (en) * | 1980-05-06 | 1985-01-25 | 株式会社日立製作所 | Refrigeration equipment |
| JPS603147U (en) * | 1983-06-21 | 1985-01-11 | 日本精工株式会社 | Webbing anchor latch device |
-
1986
- 1986-12-04 JP JP1986187321U patent/JPH0537725Y2/ja not_active Expired - Lifetime
-
1987
- 1987-11-30 CA CA000553108A patent/CA1304330C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0537725Y2 (en) | 1993-09-24 |
| JPS6394068U (en) | 1988-06-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |