Adjustable shoulder anchor mechanism

Abstract: An adjustable shoulder anchor mechanism for use in a vehicle chassis (1) having an engaging hole (31) comprises an elongated adjustment base (2) having a plurality of engaging sections (8) arranged in the longitudinal direction thereof, an adjustable anchor (3) adapted to be guided along the adjustment base (2), and the adjustment base (2) formed at one end thereof with a hook section (20), the hook section (20) adapted to be inserted into the engaging hole (31) and moved to come into engagement with the vehicle chassis (1) on an peripheral portion of the engaging hole (31).

Description: FIELD OF THE INVENTION The present invention related to an adjustable shoulder belt anchor mechanism for mounting on an automobile or the like according to the preamble part of claim 1, wherein adjustment of the height of the shoulder section of the seat belt is possible. BACKGROUND OF THE INVENTION In the conventional seat belt device for a vehicle which is provided on an automobile or the like, in order to install the seat belts at the shoulders of the occupants of the vehicle correctly suitable at positions for the physique and the sitting height of those occupants, an adjustable shoulder anchor mechanism is provided which engages to fasten, at a vertically adjustable mounting position, an adjustable anchor connected to a joint which supports a webbing. In particular, a widely used type is one with a unit which uses a continuous webbing for both shoulders and laps, in which a slip joint which passes through and supports the middle section of the webbing is connected to the adjustable anchor, making it possible to adjust the vertical mounting position. An explanation will now be given with reference to Fig.1 and Fig.2 which show, respectively, a front elevational view and a cross-sectional view of a conventional example of this type of adjustable shoulder anchor. Shown in these drawings are an adjustment base or guiding member 2 which, is installed by means of upper and lower bolts 9 on a chassis 1 of a vehicle. An adjustable anchor or runner 3 is connected to a slip joint 4 which in penetrated by a webbing 11. The adjustable anchor or runner 3 is guided so as to be moved in the vertical direction on the adjustment base 2. Provided on the adjustable anchor 3 is a movable lock pin 5 which can engage a plurality of engaging openings 8 which are provided through the adjustment base 2. The lock pin 5 is energized in the direction orthogonal to the chassis 1 by means of a spring 6 and is thus maintained in engagement with one of the engaging openings 8. The lock pin 5 can be pulled out by means or a knob 7 which is mounted on the side opposite from the chassis 1, so that the engagement is cancelled. Accordingly, when it is desired to change the height or position of the slip joint 4 which is penetrated by the webbing 11, the knob 7 is drawn toward the inside of the vehicle and the lock pin 5 is withdrawn from the engaging opening 8. The adjustable anchor 3 is therefore caused to move vertically along the adjustment base 2. At a position corresponding to a suitable engaging opening 8, the knob 7 may be released, allowing the lock pin 5 to penetratingly engage the engaging opening 8 by means of the force of the spring 6. However, in the above conventional example, the adjustment base is mounted by means of the bolts 9 to the chassis 1 of the vehicle, so that when this mounting is performed, the positioning is troublesome and time is required to tighten the bolts 9. In another conventional example, a bolt tightening section is provided in the middle section of the adjustment base. Because this bolt tightening section is within the path of movement of the adjustable anchor, there is the inconvenience that the adjustable anchor must be secured after moving it to the top or bottom edges. There is also the inconvenience that this produces limitations in the design, inasmuch as the shape of the anchor base and the bolts must be determined so as not to hamper the movement of the adjustable anchor. An adjustable shoulder belt anchor mechanism according to the preamble part of claim 1 is known from DE-U-8 709 069. With the shoulder belt anchor mechanism of this citation one of the bolts has been replaced with a hook section which engages a hole of the vehicle chassis. This arrangement significally reduces the cost for parts since a bolt may be eliminated and it reduces the cost for assembly since only one bolt needs to be fastened. However, the generic shoulder belt anchor mechanism fails to solve the problem of vibrational noise. If, as shown in the drawings, no gap ever appeared between the hook section and the edge of the hole of the vehicle chassis, then no rattling vibration noise would be generated. However, producing parts with tolerances that accurate would cost even more than would be saved by eliminating the bolt. SUMMARY OF THE INVENTION It is an object underlying the present invention to provide an adjustable shoulder belt anchor mechanism according to the preamble part of claim 1 which is able to reduce the manufacturing costs by loosening the tolerances necessary for vibration-free connection between the hook and the engaging hole. The solution of this object is achieved by the features of claim 1, 2 or 3 The dependent claims contain advantageous embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS These and other objects, features and advantages of the present invention will become more apparent from the following description of the preferred embodiments taken in conjunction with the accompanying drawings, in which: Fig.1 is a front elevational view showing an example of a conventional adjustable shoulder anchor mechanism. Fig.2 is a cross-sectional view of the example of the Fig.1. Fig.3 is a front elevational view of a first embodiment of the present invention. Fig.4 is a cross-sectional view of the first embodiment. Fig.5a is a perspective view showing the hook section of the first embodiment of the present invention. Fig.5b is a perspective view of the female engaging section or hole into which the hook section of the first embodiment is to be inserted. Fig.6a is a perspective view showing the hook section of a second embodiment of the present invention. Fig.6b is a perspective view of the female engaging section or hole into which the hook section of the second embodiment is to be inserted. Fig.7a is a perspective view showing the hook section of a third embodiment of the present invention. Fig.7b is a perspective view of the female engaging section or hole into which the hook section of the third embodiment is to be inserted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Now referring to the attached drawings, in which like members are indicated by like reference numerals throughout the drawings, in Fig.3, Fig.4, and Fig.5a, an adjustable shoulder anchor mechanism of the present invention is mounted onto a vehicle chassis 1 and comprised of an adjustment base or guiding member 2, an adjustable anchor or runner 3, a slip joint 4, a movable lock pin 5, a spring 6 and a knob 7. The adjustment base 2 is formed with a plurality of engaging sections or openings 8. These elements are substantially the same as those of the conventioanl example of Fig.1, and their detailed description is omitted. In this embodiment, the adjustment base or guiding member 2 is adapted to be secured at one end thereof with a bolt 9 to the chassis 1 at a positioning hole 33 thereof and provided with a hook section 20 at the other end thereof, while an engaging hole 31 is formed in the chassis 1, so that the hook section 20 is inserted into the engaging hole 31 and can be moved into an engagement relationship with the chassis 1. The adjustment base 2 is then secured at the one end thereof to the chassis 1 by the bolt 9 inserted through the positioning hole 33 to maintain an engaged and secured status. The hook section 20 is bent at right angles toward the chassis and has an enlarged section 21 with a width D 1 provided at the tip of the hook section 20 and having a pair of stepped sections 22 which are constricted from the enlarged section 21. The hook section 20 further has a tapered section 23 with a minimum width d 1 which expands in the direction of the adjustment base 2 from the stepped sections 22. An engaging hole 31 in the chassis 1 is provided with a first elongated hole 31a with a width D 2 into which the enlarged section 21 of the hook section 20 can be inserted, and a second trapezoidal opening 31b with a width d 2 is formed with its lower edge in common with the elongated opening 31a. The width D 2 of the elongated opening 31a as shown in Fig.5b is slightly larger than the width D 1 of the enlarged section 21, and the width d 2 of the upper edge of the trapezoidal opening is slightly smaller than the minimum width d 1 of the tapered section 23 between the stepped sections 22. In the engaging action, the hook section 20 of the adjustment base 2 is inserted into the first elongated opening 31a of the engaging hole 31 of the chassis 1 from the upper side, and is caused to move into the second trapezoidal opening 31b (in the direction of the arrow A in Fig.5b) after the enlarged section 21 is completely projected from the elongated opening 31a into the opposite side of the chassis 1. While the tapered edge surfaces of the chassis 1 at the trapezoidal opening 31b and the tapered section 23 of the hook section 20 are rubbing together, the part which has the smallest d 1 of the tapered section 23 comes into engagement with the trapezoidal opening 31b, whereby the installation operation of the one end of the adjustment base 2 is completed. The bolt 9 is then inserted at the other end of the adjustment base 2 into the positioning hole 33 and tightened, so that the adjustment base 2 is secured to the chassis 1 and maintained in an engaged and secured status. The means of securing the adjustment base or guiding member 2 to the chassis 1 at the positioning hole 33 is not limited to the bolt 9. Any type of securing means which will maintain the engaged and secured status of the adjustment base 2 and the chassis 1 can be used. Fig.6a is a perspective view showing the hook section 20 of a second embodiment of the present invention. The hook section 20 of the adjustment base 2 has an enlarged section 21 at its tip. At both ends of the enlarged section 21 with a width D 1 , a pair of arms 24 continuing straight from the enlarged section 21 are formed, and a tapered section 25 is formed between the arms 24 and raised from the enlarged section 21 at an angle with the arms 24. Furthermore the tapered section 25 is connected to the adjustment base 2 to keep the enlarged section 21 almost parallel to the adjustment base 2. It will be noted that a gap is provided between the end of the tapered section 25 and the arms 24 for interlocking with the chassis 1. The chassis 1 in Fig.6b is formed with an engaging hole 31 in a rectangular shape with a width D 2 which is slightly larger than the width D 1 of the enlarged section 21, so that it is possible to insert the enlarged section 21 of the hook section 20 into the engaging hole 31. The enlarged section 21 of the hook section 20 is first inserted perpendicularly into the engaging hole 31 in the chassis 1. Then when the tapered section 25 is entering the engaging hole 31, the adjustment base or guiding member 2 and the hook section 20 are simultaneously rotated to the top side of the chassis 1, so that the arms 24 of the hook section 20 protrude into the opposite side of the chassis 1. On moving it in the direction of the arrow A in Fig.6b, one edge of the chassis 1 on the periphery of the engaging hole 31 is interlocked and maintained in the gap between the arms 24 and the tapered section 25. Fig.7a is a perspective view showing the hook section 20 of a third embodiment of the present invention. The hook section 20 has an enlarged section 21 with a width D 1 containing a pair of stepped sections 22 and an opening 26 between the stepped sections 22. A reduced section 27 with a width d 1 perpendicular to the adjustment base 2 is formed between the adjustment base 2 and the enlarged section 21 and connected through the stepped sections 22 straight to the enlarged section 21, so that the opening 26 with a width t 1 is formed almost level with the stepped sections 22. The engaging hole 31 of the chassis 1 as shown in Fig.7b has a first elongated opening 31a with a width D 2 which is slightly larger than the width D 1 of the enlarged section 21 of the hook section 20, and also had a second rectangular opening 31b with a width d 2 which is almost identical to the width d 1 of the reduced section. The second rectangular opening 31b is continuous to the elongated opening 31a. A projection 32 with a taper protrudes into the rectangular opening 31b at the top center thereof. The width t 2 of the base of the projection 32 is slightly larger than the width t 1 of the opening 26 in the hook section 20. In the engaging action, in the same way as in the first embodiment, the enlarged section 21 is inserted into the elongated opening 31a, so that the enlarged section 21 projects completely into the opposite side of the chassis 1. At the time when the projection 32 is adjusted in the opening 26, the enlarged section 21 is moved in the direction of the arrow A in Fig.7b, and the operation is completed by firmly engaging the projection 32 in the opening 26.

Claims: An adjustable shoulder belt anchor mechanism for use in a vehicle chassis (1) having an engaging hole (31), comprising: an elongated adjustment base (2); an adjustable anchor (3) adapted to be guided along the adjustment base (2); a joint (4) connected to the adjustable anchor (3) to support a webbing belt (11); a hook section (20) at one end of the adjustment base (2) adapted to be inserted into the engaging hole (31), the hook section being folded at one end of the adjustment base (2) towards the chassis side, so that the folded portion of the hook section and the plane containing the engaging hole (31) intersect each other with a predetermined angle therebetween; the hook section (20) being provided with an enlarged section (21) at the tip portion thereof while the engaging hole (31) has a width (D2) in which the enlarged section (21) is inserted at the broadest section of the engaging hole (31); characterized in that the elongated adjustment base (2) comprises a plurality of engaging openings (8) arranged in a longitudinal direction thereof; that a lock pin (5) is provided in said adjustable anchor (3) and adapted to come into engagement with one of said engaging openings (8); that a tapered section is formed in the engaging hole (31), so that the folded portion and the engaging hole are engaged with each other through the tapered section; that said hook section (20) has an interlocking means to hold an edge of said vehicle chassis (1) on the peripheral portion of said engaging hole (31); that interlocking means comprises an opening (26) in said hook section (20) to receive a projection (32) of said vehicle chassis (1), said projection (32) comprising the tapered section; and that said engaging hole (31) is comprised of an elongated opening and a smaller rectangular opening, and said projection (32) is projected into said rectangular opening. An adjustable shoulder belt anchor mechanism for use in a vehicle chassis (1) having an engaging hole (31), comprising: an elongated adjustment base (2); an adjustable anchor (3) adapted to be guided along the adjustment base (2); a joint (4) connected to the adjustable anchor (3) to support a webbing belt (11); a hook section (20) at one end of the adjustment base (2) adapted to be inserted into the engaging hole (31), the hook section being folded at one end of the adjustment base (2) towards the chassis side, so that the folded portion of the hook section and the plane containing the engaging hole (31) intersect each other with a predetermined angle therebetween; the hook section (20) being provided with an enlarged section (21) at the tip portion thereof while the engaging hole (31) has a width (D2) in which the enlarged section (21) is inserted at the broadest section of the engaging hole (31); characterized in that the elongated adjustment base (2) comprises a plurality of engaging openings (8) arranged in a longitudinal direction thereof; that a lock pin (5) is provided in said adjustable anchor (3) and adapted to come into engagement with one of said engaging openings (8); that a tapered section is formed in the folded portion and the engaging hole (31), so that the folded portion and the engaging hole are engaged with each other through the tapered sections; that said hook section (20) has an interlocking means to hold an edge of said vehicle chassis (1) on the peripheral portion of said engaging hole (31); that said interlocking means comprises a tapered section (23) of said hook section (20) in a rubbing relationship with said chassis (1) along said engaging hole (31); and that said engaging hole (31) is comprised of an elongated opening and a smaller trapezoidal opening which defines a tapered section. An adjustable shoulder belt anchor mechanism for use in a vehicle chassis (1) having an engaging hole (31), comprising: an elongated adjustment base (2); an adjustable anchor (3) adapted to be guided along the adjustment base (2); a joint (4) connected to the adjustable anchor (3) to support a webbing belt (11); a hook section (20) at one end of the adjustment base (2) adapted to be inserted into the engaging hole (31), the hook section being folded at one end of the adjustment base (2) towards the chassis side, so that the folded portion of the hook section and the plane containing the engaging hole (31) intersect each other with a predetermined angle therebetween; the hook section (20) being provided with an enlarged section (21) at the tip portion thereof while the engaging hole (31) has a width (D2) in which the enlarged section (21) is inserted at the broadest section of the engaging hole (31); characterized in that the elongated adjustment base (2) comprises a plurality of engaging openings (8) arranged in a longitudinal direction thereof; that a lock pin (5) is provided in said adjustable anchor (3) and adapted to come into engagement with one of said engaging openings (8); that a tapered section is formed in the folded portion, so that the folded portion and the engaging hole are engaged with each other through the tapered section; that said hook section (20) has an interlocking means to hold an edge of said vehicle chassis (1) on the peripheral portion of said engaging hole (31); that said interlocking means comprises a pair of arms (24) and the tapered section which is raised from said hook section (20) in an offset shape between said arms (24); and that said engaging hole (31) is a single rectangular opening. The adjustable shoulder anchor mechanism of claim 3, wherein said chassis (1) of said vehicle has a plate thickness and said interlocking means has a gap slightly larger than said plate thickness to receive said edge of said vehicle chassis (1). The adjustable shoulder anchor mechanism of claim 4, wherein said interlocking means can exert a pinching force against said edge of said vehicle chassis (1) across said plate thickness of said chassis (1) of said vehicle. The adjustable shoulder anchor mechanism of claim 2, wherein said hook section (20) is bent at right angles toward said chassis (1), a pair of stepped sections (22) which are constricted from said enlarged section (21), the tapered section (23) expanding in a direction of said adjustment base (2) between said stepped sections (22), wherein the first elongated opening (31a) allows insertion of said enlarged section (21) of said hook section (20), and the second trapezoidal opening (31b) is formed with a lower edge in common with said elongated opening (31a). The adjustable shoulder anchor mechanism of claim 3, wherein said hook section (20) is bent toward said chassis (1), the pair of arms (24) continuing straight from said enlarged section (21) are formed at both ends of said enlarged section (21), and the tapered section (25) raised from said enlarged section (21) between said arms (24) at an angle with said arms (24), wherein said tapered section (25) is connected to said adjustment base (2) to keep said enlarged section (21) almost parallel to said adjustment base (2) so as to form a gap between said tapered section (25) and said arms (24). The adjustable shoulder anchor mechanism of claim 2, wherein the elongated opening (31a) is slightly larger in width than said enlarged section (21) of said hook section (20), and the trapezoidal opening (31b) is almost identical in width to said tapered section (23) and continuous to said elongated opening (31a). The adjustable shoulder anchor mechanism of claim 1, wherein the projection (32) with a taper protrudes from said chassis (1) into said engaging hole (31) so as to be inserted into said opening (26) during assembling, and said projection (32) has a base slightly larger than said opening (26) in said hook section.

Inventors: TOKUGAWA OSAMU, TOKUGAWA, OSAMU
Applicants: NIPPON SEIKO KK, NIPPON SEIKO KABUSHIKI KAISHA
Application year: 1988
Main classification: B60R22
IPC codes: B60R22