The invention relates to a carrier structure for an armrest for pivotable articulation to a mount of a vehicle according the preamble of patent claim 1.
When swingable center armrests of a vehicle, in particular of a motor vehicle, are involved, the support body, which serves as a padding for placement of the forearms of a vehicle occupant, is carried by carrier arms of a carrier structure which is swingably hinged to a mount of the vehicle.
Such a carrier structure 23 for a center armrest 20 articulated to a mount 30 of a rear-seat bench of a motor vehicle is shown in FIG. 9 in a view from below onto the center armrest 20. This carrier structure 23 includes a cross member 24 which consists of a rectangular frame of two solid round bars 24a and 24b which extend in parallel relation to a pivot axis A and have ends which are connected by bars 27a and 27b and transition into two carrier arms 23a and 23b. The carrier arms 23a and 23b are connected in the central region thereof by a transverse strut 22. These carrier arms 23a and 23b carry the substructure 21b of a support body 21a of the armrest 20.
The bars 27a and 27b carry each a pivot bearing 25a and 25b to provide a pivotable support of the carrier structure 23 in the mount 30. Furthermore, the round bar 24b is guided beyond the bars 27a and 27b for the formation of a stop pin 26a and 26b. These stop pins 26a and 26b interact jointly with a crash pendulum (not illustrated) and a catch hook support 28 for blocking an uncontrolled pivoting of the armrest 20.
The carrier arms 23a and 23b are made of a tubular profile, while the round bars 24a and 24b of the cross member 24 are made of solid material and connected by welding with the cross member 24. Such a carrier structure 23 of steel has the required stability to absorb all encountered forces and moments. However, a disadvantage is the high weight and the associated manufacturing costs of such a carrier structure 23.
Object of the invention is therefore to provide a carrier structure for a pivotable armrest, in particular a center armrest for a vehicle, that allows a stable connection of the carrier structure of the armrest to the console of the vehicle while having low weight and low manufacturing costs.
This object is attained by a carrier structure having the features of patent claim 1.
Such a carrier structure for an armrest for pivotable articulation to a mount of a vehicle includes two carrier arms carrying a support body, with the carrier arms being connected at one end to a cross member and the cross member having pins for pivotable support in the mount, and is characterized according the invention in that the cross member is produced by tube forming, bending and punching of a steel sheet corresponding substantially to the planar projection of the cross member, with the pins being formed as tube parts onto the cross member.
This carrier structure according to the invention enables a substantial weight reduction compared to the known carrier structure according to FIG. 7, without accepting drawbacks in terms of the strength and stiffness of the carrier structure. A further advantage is that the production of this carrier structure by tube forming, bending and punching is also more cost-effective in comparison to a production of a cross member of solid material. The tubes required for the pivotable support can also be formed with an internal thread so that the components necessary for the pivotable support can be threadably attached.
According to an advantageous configuration of the invention, the cross member is cuboid in shape with side panels that form an outer surface area and opposing base panels, with an end of the carrier arms and at least a tube part being respectively formed on the base panels. Such a cuboid cross member, which for example, can be designed in a flat shape, is able to realize the strength and stiffness required for a swingable armrest.
According to an advantageous refinement of the invention, the cross member is formed with base panels which, in the planar projection, have free edges which form a gap with the adjacent edges of the side panels for formfittingly receiving the carrier arms. Thus, both the carrier arms with the cross member and the cross member in its shape as cuboid are at the same time completed to increase stiffness, as both base panels of the cross member are connected via the carrier arms with the remaining side panels of the casing of the cross member. Preferably, dimensioning and shape of the gap conforms to the contour of the carrier arms, in particular at their end portions, in order to establish a formfitting connection between the involved components.
According to a further configuration of the invention, two opposite side panels of the cross member have each in the center region along a longitudinal centerline a recess, thereby realizing a weight reduction without reducing the stiffness of the cross member.
It is particularly advantageous when, according to a refinement of the invention, the cross member has a side panel which extends in parallel relation to the plane spanned by the longitudinal members and is formed, at least partially, with an inwardly directed bulge. This increases the stiffness and strength of the cross member. It is hereby preferred to configure the side panel provided for the bulge with marginal webs adjacent to the base panels in such a way that the area between the marginal webs is formed as a bulge. This makes it possible to provide additional space for further components of the armrest, without reducing the stiffness and strength of the carrier structure.
According to a further configuration of the invention, a further tube part is formed on each of the end faces of the base panels of the cross member as receiving mandrel for limiting an uncontrolled pivotal movement of the carrier structure in relation to the vehicle-side mount. A crash pendulum for example interacts with this additional tube part.
According to a refinement, the carrier arms to be connected with the cross member can be manufactured from a flattened tube in order to enable a connection with the cross member by a welded joint.
As an alternative, the carrier arms can be formed according to another configuration of the invention as a double sheet metal part with two parallel sheet metal parts, which are connected at the free end of the carrier arm and connected on the cross-member side to the cross member by a welded joint. As a result, the total weight of the carrier structure can be further reduced with such carrier arms.
An exemplary embodiment of the invention will now be described in greater detail with reference to the accompanying drawings. It is shown in:
FIG. 1 a perspective illustration of a carrier structure for an armrest according to the invention,
FIG. 2 a perspective illustration of a cross member of the carrier structure of FIG. 1 in a first view,
FIG. 3 a perspective illustration of a cross member of the support structure of FIG. 1 in a second view,
FIG. 4 a perspective illustration of a cross member of the carrier structure of FIG. 1 in a third view,
FIG. 5 a principal sketch of a planar projection of the cross member according to FIG. 2,
FIG. 6 a view of a base panel of the cross, member according to FIG. 2,
FIG. 7 a sectional view of the cross member taken along section I-I in FIG. 4,
FIG. 8 a detailed perspective illustration of a cross member according to the invention with a carrier arm made from a double sheeted metal part, and
FIG. 9 a perspective illustration of an armrest with a carrier structure according to the prior art.
The carrier structure 1 of the invention according to FIG. 1 for receiving an armrest body (not shown) for formation of a swingable armrest of a vehicle includes a cross member 4, to which two carrier arms 3a and 3b are welded that are connected in addition in midsection via a transverse strut 2. The cross member 4 is articulated to a mount (not shown) of the vehicle via two pivot bearings 12a and 12b for swinging about a pivot axis A. Two further receiving mandrels 13a and 13b are also formed on the cross member 4, with the receiving mandrel 13b interacting with a crash pendulum 14 in order to prevent the armrests from swinging open uncontrollably in the presence of high accelerations of the vehicle. Such crash pendulums are known to the artisan and therefore will not be explained hereinafter in more detail.
The FIGS. 2, 3 and 4 show the cross member 4 in different perspective views from which its cuboid shape becomes apparent. This cuboid cross member 4 is made from a flat steel plate, which is formed substantially as planar projection of its cuboid configuration, by tube forming, bending and punching. This planar projection is illustrated in principle in FIG. 5, which has side panels 5, 6, 7 and 8 to form the outer surface area of the cross member 4, and two base panels 10 and 11, which form the end faces of the cuboid configuration. The side panel 8 includes, according to FIG. 5, two sub-areas 8a and 8b having each a fishplate 9a and 9b that are angled perpendicular to the end face 8, when the cross member has been completely produced, and flatly rest on one another so as to be connectable, e.g., by welding spots 15.
Further, its flat shape becomes apparent from FIGS. 2 to 4, 6 and 7; i.e. the width B is substantially greater than the height H of the cross member 4.
The cross member 4 is produced as sheet metal forming part by several process steps from the planar projection according FIG. 5 through punching, tube forming and bending. Accordingly, elongate recesses 5c and 7c are initially produced in the side panels 5 and 6 as cutouts. Furthermore, an inwardly directed bulge 7d is impressed in the side panel 7, with the bulge extending about an axis in longitudinal direction in correspondence with the pivot axis A of the cross member 4. This bulge 7d does hereby not extend over the entire length L of the cross member 4, but a marginal web 7e remains at each of the edges 7a and 7b of the side panel 7, as can be seen in FIG. 3 and the sectional view of FIG. 7.
A pivot bearing 12a and 12b as well as a receiving mandrel 13a and 13b are produced in each of the base panels or end faces 10 and 11, with a thread 16 being also cut into the pivot bearings 12a and 12b.
The thus-prepared planar projection is brought by several bending steps into the shape according to FIGS. 2 to 4, 6 and 7, with the end faces 10 and 11 being processed such that their free edges 10a, 10b and 10c and 11a, 11b and 11c in the planar projection do not bear upon the edges 5a and 5b and 7a and 7b of the side panels 5 and 7, respectively, i.e. also not upon the edges 8c and 8d of the sub-areas 8a and 8b, but a respective gap 17a and 17b remains and extends along the free edges 10a, 10b and 10c and 11a, 11b and 11c of the end faces 10 and 11, respectively. This gap 17a, 17b receives the end of the longitudinal member 3a and 3b, respectively, and is formfittingly connected through welding with the cross member 4, i.e. with the side panels 5, 7 and 8 as well as with the end face 10 and 11, respectively. The participating edges of these side panels 5, 7 and 8 as well as the end faces 10 and 11 are contoured according to the geometry of the end regions of the longitudinal members 3a and 3b. The thus-produced carrier structure 1 is shown in FIG. 1. The used longitudinal members 3a and 3b represent flattened tubes.
The flattened tubes as longitudinal members 3a and 3b used in the carrier structure 1 according to FIG. 1 may also be replaced by a double sheet metal part, as shown in FIG. 8. This double sheet metal part is manufactured from a sheet metal strip 18 which is folded once at a bending site 18a forming the end of the carrier arm 3b. The free ends 18b and 18c of this sheet metal strip 18 are inserted in gap 17b and welded with the edges 11a, 11b and 11c and the edges 5b and 7b of the side panels 5 and 7.
Production costs can be reduced with this solution compared to the use of flattened tubes as the carrier arms 3a and 3b since the use of such flattened tubes is relatively expensive. Furthermore, a carrier structure 1 produced in this way has also reduced weight.
REFERENCE SIGNS
1 carrier structure
2 transverse strut
3
a longitudinal member of the carrier structure 1
3
b longitudinal member of the carrier structure 1
4 cross member of the carrier structure 1
5 side panel of the cross member 4
5
a free edge of the side panel 5 in the planar projection of the cross member 4
5
b free edge of the side panel 5 in the planar projection of the cross member 4
5
c recess of the side panel 5
6 side panel of the cross member 4
7 side panel of the cross member 4
7
a free edge of the side panel 7 in the planar projection of the cross member 4
7
b free edge of the side panel 7 in the planar projection of the cross member 4
7
c recess of the side panel 7
7
d bulge of the side panel 7
7
e marginal web
8 side panel of the cross member 4
8
a sub-area of the side panel 8
8
b sub-area of the side panel 8
8
c free edge of the side panel 8 in the planar projection of the cross member 4
8
d free edge of the side panel 8 in the planar projection of the cross member 4
9
a fishplate
9
b fishplate
10 base panel, end face of the cross member 4
10
a free edge of the base panel 10 in the planar projection of the cross member 4
10
b free edge of the base panel 10 in the planar projection of the cross member 4
10
c free edge of the base panel 10 in the planar projection of the cross member 4
11 base panel, end face of the cross member 4
11
a free edge of the base panel 11 in the planar projection of the cross member 4
11
b free edge of the base panel 11 in the planar projection of the cross member 4
11
c free edge of the base panel 11 in the planar projection of the cross member 4
12
a pivot bearing of the cross member 4
12
b pivot bearing of the cross member 4
13
a receiving mandrel of the cross member 4
13
b receiving mandrel of the cross member 4
14 crash pendulum
15 welding spots of the fishplates 9a and 9b
16 thread of the pivot bearings 12a and 12b
17
a gap for receiving the carrier arm 3a
17
b gap for receiving the carrier arm 3b
18 sheet metal strip for the production of the carrier arms 3a and 3b
18
a bending site of the sheet metal strip 18
18
b end of the sheet metal strip 18
18
c end of the sheet metal strip 18
21 armrest according to the prior art
21
a arm support
21
b substructure
22 transverse strut
23 carrier structure of the armrest 20
23
a longitudinal member of the carrier structure 23
23
b longitudinal member of the carrier structure 23
24 cross member of the carrier structure 23
24
a round bar of the cross member 24
24
b round bar of the cross member 24
25
a pivot bearing of the cross member 24
25
b pivot bearing of the cross member 24
26
a receiving mandrel of the cross member 24
26
b receiving mandrel of the cross member 24
27
a bar of the cross member 24
27
b bar of the cross member 24
28 catch hook support
30 mount
Patent Application
20150115682
