CH654181A5 - BUCKLE FOR SAFETY BELTS ON A VEHICLE. - Google Patents

Description

The invention relates to a buckle for a seat belt on a vehicle, comprising a mechanism located inside a housing and consisting of a lower plate and an upper plate connected at one of their ends by a single rivet and containing between them a median plate retained by the same rivet and having an anterior recess which forms an anterior seat for the tongue of a hooking lug connected to the belt as well as a posterior seat for the end of the tie rod intended to be fixed to the vehicle body.

Known devices of this kind are quite complicated to produce because the different parts must be assembled with care and maintained until the moment of blocking. In addition, the parts forming these structures are often numerous and difficult to build and assemble.

In known devices, the blockages of the tongue forming part of the hooking tab work in such a way that the release becomes difficult if there is tension between the buckle and the belt. The object of the invention is to avoid this drawback by proposing a loop which is at the same time simple to make, solid, easy to assemble and constituted by a reduced number of parts allowing the stall to be easily carried out.

The invention relates to a buckle for a seat belt on a vehicle, comprising a mechanism located inside a housing and consisting of a lower plate and an upper plate connected at one of their ends by a single rivet and arranged on either side of a median plate retained by the same rivet and having a front recess which forms a front seat for the tongue of a hooking plate intended to be connected to the belt as well as a rear seat for the end of the tie rod intended to be fixed to the vehicle body, characterized in that the lower plate comprises a central opening with two lateral housings and two appendages projecting towards the inside of the housing and provided with claws engaged in recesses of the middle plate and in recesses of the upper plate, and in that an oscillating plate is arranged in the central opening of the lower plate by presenting a bulging ce ntral in the opening of the tongue, this oscillating plate being provided with lateral flanges which have at their ends teeth engaged in housings of the three plates so as to allow the guidance of the oscillating plate subjected to the action of springs for the reminder of this oscillating plate in the hanging position and to the action of stall protrusions carried by a stall button which can be lowered through the central opening of the upper half-casing.

An embodiment of the invention will be described by way of example with reference to the appended drawing in which:

fig. 1 is a perspective view of a seat belt buckle according to the invention;

fig. 2 is a longitudinal section along the line II-II of fig- 1;

fig. 3 is a cross section along line III-III of fig-1;

fig. 4 is an exploded view of the loop;

fig. 5 is a perspective view of the central mechanism in the pre-assembly position, and FIG. 6 is a partial longitudinal section along the line VI-VI of FIG. 5.

The seat belt buckle includes a housing 1 connected to a metal tie rod 2 which, in turn, is fixed to the vehicle body. The housing also receives a hooking plate 3 provided with an end tab and connected to a strap 4 of the belt.

The housing 1 consists of two half-housings 6, 7 made of plastic material and fixed together by four screws 8. At a first end, the housing has an opening in which the tie rod 2 is inserted; at its other end is another opening provided with slides for the entry of the terminal tab of the plate 3.

Inside the housing, there is a main bearing structure, or carcass, constituted by two plates comprising the lower plate 9 and the upper plate 17 connected together by a rivet 30 which is also used to join the structure to the tie rod 2.

This tie rod 2 has, at its end, a flattened part 2a pierced with a hole 31 in which the fixing rivet 30 is placed. The internal structure of the loop comprises a first lower plate 9 having at the rear a lowered end 9a with a central hole 10 'for the rivet 30; the front part of the plate 9 has an opening 10 comprising on its periphery recessed recesses 10a. The plate 9 carries on its upper face two appendages 11 terminated by retaining teeth 12.

To the lower plate 9 is fixed a middle plate 13 which may be made of plastic and has towards the rear an opening 14 for the housing of the flattened part 2a of the tie rod 2 and a front opening 15 providing a housing for receiving without play the tongue of the hooking plate 3. The opening 15 has recessed recesses 15a while outside the plate 13 are provided two symmetrical recesses 16 for receiving the appendages 11 of the bottom plate 9. At the plate middle 13 is associated with an upper plate 17 having at the rear a hole 18 for the assembly rivet 30 and at the front an opening 19 of suitable outline. The plate 17 has lateral recesses 21 for receiving the appendages 11 of the lower plate 9 and longitudinal slots 20 whose role will appear in the following description.

The three plates mentioned above, 9-13-17, can be pre-assembled and retained in their exact mounting position in fig. 5 before laying the rivet 30 by using the lateral appendages 11 and the teeth 12 of the lower plate 9 which engage in the recesses 16 of the intermediate plate 13 and in the recesses-

5

10

15

20

25

30

35

40

45

50

55

60

65

3

654,181,

elements 21 of the upper plate 17. This allows the carcass to be conveyed on a belt conveyor without it being necessary to provide a fixing of the plates between them. In this pre-assembly position of the three superimposed plates, the structure comprises an oscillating plate 22 which has a boss 23 centrally, intended to fit into an opening 5 in the tongue of the attachment plate 3, and which is provided laterally with appendages 24 with two sides 25 projecting upwards and carrying symmetrical lateral teeth 26-27.

In the assembly, the appendages and the sides mentioned are inserted into the housings 15a of the main opening 15 of the intermediate plate 13 and into the slots 20 of the upper plate 17 by making, as shown in FIG. 6, an embedding of the oscillating plate and of the three superimposed plates of the carcass. In the hooking position of the loop shown in fig. 2, the oscillating plate 22 is completely engaged in the opening 10 of the lower plate 9. At its rear end, the oscillating plate 22 carries two appendages 28 pierced with holes 29 and subjected to the action of helical springs 32 which are mounted on protruding pins 33

inside the lower half-housing 7 and are intended to push the oscillating plate to its position of embedding in the hooking plate. In the holes 29 of these appendages 28 are embedded the two pins 34 extending two lateral projections 35 of the button 36 5 which is housed with the possibility of sliding in a seat 37 hollowed out in the upper half-housing 6.

By pushing the button 36 with your finger, the wafer 22 is made to oscillate downwards, pushed by the projections 35, thus bringing out its central boss 23 from the opening 5 of the latching tongue 3, which io ensures that the latching of the seatbelt.

The device described above has several practical and operational advantages which can be summarized as follows:

- all the parts of the carcass are connected together by a single rivet;

15 - the tongue of the attachment plate 3 is driven without play in a housing resulting from the association of the different plates of the carcass;

- the different parts of the carcass remain assembled by the recesses provided before the assembly rivet is installed.

R

2 drawings sheets

Claims (3)

654,181 1. Buckle for a seat belt on a vehicle, comprising a mechanism (9, 13, 17) located inside a housing (6, 7) and constituted by a lower plate (9) and an upper plate (17 ) connected at one of their ends by a single rivet (30) and arranged on either side of a central plate (13) retained by the same rivet and having a front recess (15) which forms a front seat for the tongue of a hooking plate (3) intended to be connected to the belt, as well as a rear seat (14) for the end (2a) of the tie rod (2) intended to be fixed to the body of the vehicle, characterized in that the lower plate (9) comprises a central opening (10) with two lateral housings (10a) and two appendages (11) projecting towards the inside of the housing and provided with claws (12) engaged in recesses (16) of the middle plate (13) and in recesses (21) of the upper plate (17), and in that an oscillating plate (22) is d isposed in the central opening (10) of the lower plate by presenting a central bulge (23) inserted in the opening (5) of the tongue (3), this oscillating plate being provided with lateral flanges (25) which present to their ends of the teeth (26, 27) engaged in housings (10a, 15a, 20) of the three plates (9, 13, 17) so as to allow the guidance of the oscillating plate (22) subjected to the action of springs (32) for the recall of this oscillating plate in the hanging position and to the action of stall protrusions (35) carried by a stall button (36) which can be lowered through the central opening (37) of the upper half-casing (6). 2. Buckle according to claim 1, characterized in that the three plates (9, 13, 17) are held together by claws (12) of the lower plate extending in lateral housings (16, 21) of the other two fixed plates (13, 17) so as to form an assembly before fitting the assembly rivet (30). 2 3. Buckle according to one of claims 1 or 2, characterized in that the housing (6, 7) and the middle plate (13) are molded in plastic.