Additional scissors for vehicle seats

Abstract

Scissor system (1) for vehicle seats, in which an upper frame (3) is guided parallel to a base frame (2) by means of scissors (4) and which is aligned in the longitudinal direction of the vehicle, characterized in that the upper frame (3) is guided parallel to the base frame (2) by an additional scissor (11) consisting of at least one first scissor bracket (12) and at least one second scissor bracket (13) rotatably connected thereto, transversely to the direction of travel.

Description

[0001] The invention relates to a scissor system for vehicle seats, in which the upper part of the seat is guided and sprung in parallel with a base plate by means of two scissor crosses.

[0002] Scissor-type suspension systems are known for use in sprung seats in tractors, construction machinery, and similar equipment. In these systems, a seat upper is guided parallel to a base or mounting plate by two (or more) laterally spaced pairs of scissor arms, hereinafter referred to as scissors. The ends of the scissor arms are mounted in a lower frame, hereinafter referred to as the base frame, and an upper frame, hereinafter referred to as the upper frame. In these oscillating systems, the scissor arms are rotatably mounted at one end and slidably mounted at the other end in a parallel guide. The two parallel scissor arms are connected to each other via cross-connections and are rotatably mounted relative to one another, thus forming the scissor mechanism of the scissor system.

[0003] The integration of longitudinal suspension into these scissor systems by means of movable mounting of the pivot bearings in the upper or lower frame in the longitudinal direction is also known. Scissor systems are generally oriented in the longitudinal direction of the vehicle, since the shape of the scissor arms in this orientation provides high resistance to pitching movements (tilting in the longitudinal direction of the vehicle) of the seat upper. This resistance is necessary for seat stability during acceleration and braking or in accident situations.

[0004] In contrast, the scissor mechanism, which is aligned longitudinally with the vehicle, offers little resistance to roll (tilting perpendicular to the direction of travel). This leads to significant lateral movement of the seat head on uneven roads or surfaces. This lateral movement impairs driving comfort. If these movements are transmitted to control or operating elements mounted on the seat—known to experts as control consoles for vehicle or machine functions—their operation is impaired. If these movements are transmitted to display instruments mounted on the seat, visibility is impaired. With touchscreen displays, both visibility and operability are affected. All these impairments result in increased workload and reduced comfort.To reduce these impairments, components of the scissor system, especially the scissor hinges, are made with significantly greater wall thicknesses, or are extensively reinforced or stiffened. This leads to increased complexity, weight, and costs for the scissor systems.

[0005] The object of the invention is to significantly increase the resistance of a scissor system to swaying movements without having to reinforce the scissor system in a costly manner.

[0006] This problem is solved according to the invention by mounting a further scissor mechanism, called an auxiliary scissor mechanism, transversely to the direction of travel between the base frame and the upper frame of a scissor system. The scissor arms of this auxiliary scissor mechanism, as in the scissor system itself, are rotatably mounted at one end and slidably mounted at the other end in sliding guides to guide the upper frame parallel to the base frame. The auxiliary scissor mechanism can be mounted directly in the transverse profiles of the base or upper frame of the scissor system or in additional components attached thereto.

[0007] An advantageous further development is the installation of a second additional scissor on the side opposite the first additional scissor in the direction of travel, which leads to an additional increase in lateral stiffness.

[0008] Another advantageous development is the incorporation of play in the bearings of the auxiliary scissors, which avoids so-called double fits and thus the increase in friction of the scissor system.

[0009] Another advantageous development is the elastic design of one or more bearings of the auxiliary shear, which avoids so-called double fits and simultaneously disruptive noises.

[0010] Another advantageous development is the laterally movable mounting of one or both rotary bearings of the auxiliary scissors, which allows for the compensation of manufacturing tolerances.

[0011] An advantageous further development is the installation of one or more springs which act on one or both scissor tabs and load them towards a lower position, thereby preventing noise from rattling of the additional scissors.

[0012] A beneficial development for providing large lifting ranges is the installation of two superimposed auxiliary scissor arms. The upper endpoints of the scissor arms of the first auxiliary scissor arm are not mounted on the upper frame, but are rotatably connected to the lower endpoints of the second auxiliary scissor arm, and the upper ends of the scissor arms of the second auxiliary scissor arm are mounted on the upper frame.

[0013] In a scissor system with known integrated longitudinal suspension, a relative movement occurs in the longitudinal direction between the upper frame and the base frame.

[0014] In this case, an advantageous further development of the invention exhibits a corresponding degree of freedom in the respective bearing points of the auxiliary scissor. This degree of freedom is achieved, for example, through a corresponding structural design or through correspondingly flexible materials of the bearings, or a combination thereof, whereby the auxiliary scissor can follow the relative movement between the base and upper frames by means of tilting movements.

[0015] An advantageous further development is the use of the additional scissor in the extended state of the scissor system as a catch device, in which the scissor tabs of the additional scissor reach a final position in the sliding guides and absorb tensile forces and can thus replace other catch devices, such as a catch belt.

[0016] The design of the auxiliary shear, with regard to the shape, dimensions, and material of the shear plates, the design of the shear bearing, etc., can be flexibly adapted to the specific application. For example, the ends of the outer shear plate can be cranked to transfer the force as directly as possible to the bearing points via short bearing pins. Likewise, a wide variety of bearing and sliding guide designs are known to those skilled in the art, so these will not be described in detail here.

[0017] The invention is explained in more detail below with reference to two exemplary embodiments and the drawings.

[0018] In the first embodiment of the auxiliary scissor according to the invention, the cross profiles of the base and upper frames each have a bore for the pivot bearing on a laterally outwardly directed, vertical transverse surface and, on the opposite side, a guide groove for the parallel guide. In this embodiment, a bearing bushing is arranged in the respective bore for the pivot bearing and a sliding element in the respective guide groove for the parallel guide. The auxiliary scissor engages with bearing pins at the ends of the scissor arms in the bearing bushings or the sliding elements. In a second embodiment, a double auxiliary scissor for increasing the stroke is shown. Fig. Figure 1 shows a scissor system Fig. Figure 2 shows a cross-section for the storage of the additional shears. Fig. Figure 3 shows an additional scissor with a lower and an upper cross-section. Fig. Figure 4 shows a double auxiliary scissor mechanism for increasing the stroke.

[0019] The in Fig. The scissor system (1) shown consists of a base frame (2), an upper frame (3) and a scissor mechanism (4). The positions of the cross-sections of the base and upper frames are indicated (5, 6).

[0020] The in Fig. 2 The cross-section (5, 6) of a base or upper frame (2, 3) shown shows a pivot bearing point consisting of a bearing bushing (9, 9') in a non-visible bore (7, 7') and a sliding guide consisting of a guide groove (8, 8) with a sliding body (10, 10').

[0021] The in Fig. The auxiliary scissor mechanism (11) shown in Figure 3 consists of a first scissor link (12) and a second scissor link (13) rotatably connected to it. The bearing pins (14, 14', 15, 15' - only the positions are shown) engage in the bearing bushings (9, 9') and sliding elements (10, 10') in the base frame (5) and upper frame (6). (The bearing bushings (9, 9') and the sliding elements (10, 10') are concealed by the scissor links. See also...) Fig. 2).

[0022] The in Fig. 4 The double auxiliary shear (16) shown consists of a first auxiliary shear (11) mounted in a lower cross-section (5) and a second auxiliary shear (11') connected to it, mounted in an upper cross-section (6). Reference symbol list 1 Scissor system 2 basic frames 3 upper frames 4 scissor arms 5 Lower cross-section 6 Upper cross-section 7, 7' bores 8, 8' guide grooves 9, 9' Bearing bushings 10, 10' sliding body 11, 11' Additional scissors 12 First scissor flap 13 Second scissor flap 14, 14' Bearing journal 15, 15' Bearing pin 16 Double auxiliary scissors

Claims

[1] Scissor system (1) for vehicle seats, in which an upper frame (3) is guided parallel to a base frame (2) by means of a scissor mechanism (4) and is aligned in the longitudinal direction of the vehicle, characterized by , that the upper frame (3) is guided parallel to the direction of travel by an additional scissor mechanism (11) consisting of at least one first scissor link (12) and at least one second scissor link (13) rotatably connected to it. [2] Scissor system (1) according to claim 1, characterized by , that the additional scissor (11) is attached to the rear of the scissor system (1) in the direction of travel. [3] Scissor system (1) according to claim 1, characterized by , that the additional scissor (11) is attached in the direction of travel from the scissor system (1). [4] Scissor system (1) according to claim 2, characterized by , that a second additional scissor (11) is attached to the scissor system in the direction of travel. [5] Scissor system (1) according to any one of the preceding claims, characterized by , that the first scissor tabs (12) and the second scissor tabs (13) of the additional scissor (11) are rotatably and slidably mounted in a lower cross-section (5) and an upper cross-section (6) and form a parallel guidance of the upper frame against the base frame. [6] Scissor system (1) according to claim 5, characterized by , that the lower cross-section (5) is part of the base frame (2). [7] Scissor system (1) according to claim 5, characterized by , that the upper cross profile (6) is part of the upper frame (3). [8] Scissor system (1) according to claim 5, characterized by , that the cross-sections (5, 6) each contain a rotary bearing (9, 9') and / or a sliding body (10, 10'). [9] Scissor system (1) according to claim 8, characterized by , that the rotary bearings (9, 9') and / or the sliding bodies (10, 10') are designed to be elastically deformable. [10] Scissor system according to any of the preceding claims, characterized bythat one or more springs act on one or more scissor tabs of the auxiliary scissors. [11] Scissor system according to claim 10, characterized by that the spring is a tension spring, a compression spring or a torsion spring. [12] Scissor system (1) according to one of the previous claims, characterized by , that the additional scissors (11) are designed as double scissors.

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