Seat frame
The chair frame with linked guide elements in elongated holes addresses the inefficiency of leg support extension mechanisms, achieving smooth and space-efficient leg support operation with reduced material strain.
Patent Information
- Application Number
- CN202080041515.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Priority Date
- 2019-07-23
- Filing Date
- 2020-07-22
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2040-07-22
AI Technical Summary
The removal mechanism of the leg support extension of the existing seat chassis has problems such as complex structure, large friction and large space occupation, making it difficult to achieve smooth and efficient removal and movement in a small structural space.
The guiding mechanism of the guide element in the long hole is adopted, combined with the ball bearing and the long hole design in the curved shape, so as to achieve gentle removal and movement of the leg support extension, through the pivot connection of the first and second pull rods, friction is reduced and space utilization is optimized.
In a relatively small structural space, a relatively large distance of the leg support extension is achieved, which reduces the operating force requirement, reduces the risk of material crease, and improves the comfort of use and space utilization efficiency.
Smart Images
Figure CN113939215B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a seat frame. Background Art
[0002] A seat frame with a pivotable leg support frame is known from the prior art. The leg support frame can be folded and unfolded so that it can be used by the user either as a leg support or stored under the seat to save space when the leg support frame is not needed. A leg support extension is also known, which extends the leg support in the unfolded state of the leg support frame and is moved in when the leg support frame is in the folded state. Summary of the Invention
[0003] In contrast, the present invention is based on the task of providing a seat frame with an improved removal mechanism for a leg support extension.
[0004] This task is solved by a seat frame according to the present invention.
[0005] The seat frame includes a seat surface frame, a leg support frame pivotally arranged on the seat surface frame, and a leg support extension that can be moved in and out and is arranged on the leg support frame. Here, the seat surface frame is understood within the scope of this specification as a frame on which a seat cushion can be arranged, and the seat cushion can then be used as a seat surface for the user.
[0006] The leg support frame can be pivoted from an unfolded position to a folded position and vice versa. The leg support extension is connected to the leg support frame via a first and a second pull rod. The first pull rod has an oblong hole and a first guiding element. The second pull rod has a second oblong hole and a second guiding element. The second guiding element is movably arranged in the first oblong hole. The first guiding element is movably arranged in the second oblong hole.
[0007] The particularly smooth removal and insertion of the leg support extension is achieved by guiding the guiding element in the oblong hole. Due to the movement possibility of the guiding element in the oblong hole, the leg support extension can be removed and inserted over a relatively large distance with a relatively small structural space.
[0008] According to an embodiment of the present invention, the first and second guiding elements can each include a ball bearing. This results in relatively small friction, so that relatively small forces are required for the insertion and removal movements of the leg support extension.
[0009] According to an embodiment of the present invention, the first oblong hole can have a curved shape. The curved shape is particularly understood within the scope of this specification as a shape that has a smooth direction change at the boundary of the oblong hole. Due to this curved shape, the guiding element is advantageously guided in an arc shape.
[0010] According to one embodiment of the present invention, the first stay bar may have a base body. The first elongated hole can extend away from the base body at an angle greater than 45°. Here, the base body substantially defines the shape of the stay bar itself. Through the first elongated hole protruding away from the base body, the leg support extension can be moved out to a particularly large extent.
[0011] According to one embodiment of the present invention, the second elongated hole may have an open end. This is particularly advantageous for the assembly of the seat frame. The first guide element can be inserted into the open end of the second elongated hole without great expense.
[0012] According to one embodiment of the present invention, the first stay bar may be pivotable relative to the leg support base frame and relative to the second stay bar.
[0013] According to one embodiment of the present invention, the second stay bar may be pivotable relative to the first stay bar and relative to the leg support extension.
[0014] According to one embodiment of the present invention, the first stay bar may be pivotable about a first rotation center. The first stay bar can be fixed at the first rotation center on the leg support base frame.
[0015] According to one embodiment of the present invention, the first rotation center can be arranged in a position-fixed manner relative to the leg support base frame. Here, the term "position-fixed" is understood within the scope of this specification as meaning that the first rotation center does not move relative to the leg support base frame.
[0016] According to one embodiment of the present invention, the second stay bar may be pivotable about a second rotation center. The second stay bar can be fixed at the second rotation center on the leg support extension.
[0017] According to one embodiment of the present invention, the second rotation center may be position-fixed relative to the leg support extension.
[0018] According to one embodiment of the present invention, when the first stay bar pivots about the first rotation center, the first and second guide elements can move in the first or second elongated hole.
[0019] According to one embodiment of the present invention, the second guide element may be arranged between the second elongated hole and the second rotation center.
[0020] According to an embodiment of the present invention, the seat frame may include a third tie rod, and the third tie rod is pivotally provided on the seat frame at the first end. At the second end, the third tie rod is connected to a cantilever provided on the first tie rod. When folding the leg support frame, the third tie rod can deflect the first tie rod. This can be done especially by applying a force from the third tie rod to the cantilever.
[0021] According to an embodiment of the present invention, the cantilever can be spaced apart from the first tie rod by more than 90° on a geometric circle around the first rotation center. Here, the center of this geometric circle can be defined by the first rotation center. Herein, the "geometric circle" is not particularly understood as a component of an existing circle. The geometric circle can be virtual and is only used to define the position of the cantilever.
[0022] According to an embodiment of the present invention, the leg support frame can be pivotable about a geometric axis of rotation. The first end of the third tie rod can move horizontally past the geometric axis of rotation during the folding of the leg support frame. Herein, the "horizontal direction" is understood within the scope of this specification as the direction that is horizontal when the seat frame is used according to the regulations. In addition to the movement in the horizontal direction, there can also be a component of movement in the vertical direction.
[0023] According to an embodiment of the present invention, the leg support extension can be further retracted at a time point during the folding of the leg support frame than in the folded state of the leg support frame. This is especially advantageous because when the leg support frame is folded to such an extent that the leg support frame is on the shortest travel between the front end of the seat surface frame and the floor surface (the seat frame is on the floor surface), the leg support extension should be retracted as much as possible. At this point, contact between the leg support frame or the leg support extension and the floor surface should be avoided. Advantageously, the leg support extension is then slightly retracted again during folding because the material used to cover the leg support frame and possibly also the leg support extension is then tensioned, thereby reducing the risk of undesired creases in the material. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Other features and advantages of the present invention become apparent from the following description of preferred embodiments with reference to the accompanying drawings. Herein, the same reference numerals are used for the same or similar components and for components having the same or similar functions. In the drawings:
[0025] Figure 1 A schematic perspective view of a seat frame according to an embodiment of the present invention with an unfolded leg support frame and a retracted leg support extension is shown;
[0026] Figure 2 ShownFigure 1 Schematic perspective view of a seat frame with a partially folded leg support chassis and a partially inserted leg support extension;
[0027] Figure 3 Shows Figure 1 with Figure 2 Compared with, a schematic perspective view of a seat frame with a further folded leg support chassis and a fully inserted leg support extension; and
[0028] Figure 4 Shows Figure 1 with a fully folded leg support chassis and a leg support extension that is slightly partially extended compared to Figure 3 Schematic perspective view of a seat frame. Detailed Description
[0029] The seat frame includes a seat surface frame 100, a leg support chassis 101, and a leg support extension 102. The folding movement of the leg support chassis is shown in Figures 1 to 4 . The unfolding movement of the leg support chassis is obtained when observing the respective drawings in the reverse order.
[0030] The leg support chassis 101 can pivot about a geometric pivot axis. Here, the pivot axis is defined by a pivot element 103. The pivot movement of the leg support chassis 101 is triggered by moving the seat surface frame 100 forward (i.e., in the direction of the leg support chassis 101) or backward (i.e., away from the leg support chassis 101). When the seat surface frame 100 moves forward, the leg support chassis 101 is folded. When the seat surface frame 100 moves backward, the leg support chassis 101 is unfolded.
[0031] The seat frame includes a first tie rod 104, a second tie rod 105, and a third tie rod 106. The leg support extension 102 is connected to the leg support chassis 101 via the first tie rod 104 and the second tie rod 105. The second tie rod 105 is connected to the seat surface frame 100 via the third tie rod 106. The first tie rod 104 can rotate about a first rotation center 107 and also has a first elongated hole 109, a first guide element 108, and a cantilever 110. The third tie rod 106 is connected to the cantilever 110. The second tie rod 105 can rotate about a second rotation center 113 and has a second elongated hole 111 and a second guide element 112.
[0032] The second elongated hole 111 is open on one side. This has the advantage that during the assembly of the seat frame, the first guide element 108 can be inserted into the elongated hole without further effort.
[0033] In the Figures 1 to 3During the folding movement shown, the third pull rod 106 is pushed forward because it is fixed to the seat surface frame 100, so that the third pull rod applies a force to the cantilever 110 connected to the third pull rod. This force triggers the pivoting of the first pull rod 104 about the first rotation center 107. Since the second guiding element 112 is arranged in the first elongated hole 109, the curved shape of the first elongated hole 109, and the first guiding element 108 is arranged in the second elongated hole 111, here, the second pull rod 105 pivots about the second rotation center 113 and is pulled in the direction towards the leg support chassis 101.
[0034] During Figure 3 the leg support extension 102 is fully retracted. This is particularly advantageous in that the leg support chassis 101 is in a position with the smallest spacing between the seat surface frame 100 and the floor surface (the seating chassis is on the floor surface). In order to provide a relatively long support surface for the user's legs in a relatively small structural space, it is advantageous to fully retract the leg support extension 102 into the position.
[0035] When the leg support chassis 101 is further folded, the leg support extension 102 is slightly retracted again in order to tension the material that can be used to cover the leg support extension 102 and the leg support chassis 101. Therefore, the risk of undesired creases in the material in the folded leg support chassis 101 is reduced. This is achieved by the end of the third pull rod 106 connected to the seat surface frame 100 moving horizontally past the pivot axis of the leg support chassis. After this movement, when the leg support chassis 101 is further folded, the third pull rod 106 is pulled on the cantilever 110, thereby retracting the leg support extension 102.
Claims
1. A seat frame, the seat frame comprising a seat surface frame (100), a leg support frame (101) pivotally provided on the seat surface frame and including a leg support extension (102) that can be moved in and out, wherein, The leg support extension part (102) is arranged on the leg support chassis (101), wherein the leg support chassis (101) can pivot from an unfolded position to a folded position, and the leg support extension part (102) is connected to the leg support chassis (101) via a first stay bar (104) and a second stay bar (105). It is characterized in that the first stay bar (104) has a first elongated hole (109) and a first guiding element (108), and the second stay bar (105) has a second elongated hole (111) and a second guiding element (112), wherein the second guiding element (112) is movably arranged in the first elongated hole (109), and the first guiding element (108) is movably arranged in the second elongated hole (111). The first stay bar (104) can pivot around a first rotation center (107), wherein the first stay bar (104) is fixed at the first rotation center (107) on the leg support chassis (101). The seat chassis includes a third stay bar (106), wherein the third stay bar (106) is pivotally arranged at a first end on the seat surface frame (100), and the third stay bar (106) is connected to a cantilever (110) arranged on the first stay bar (104) at a second end. When folding the leg support chassis (101), the third stay bar (106) deflects the first stay bar (104), and the cantilever (110) is spaced from the first stay bar (104) by more than 90° on a geometric circle around the first rotation center (107).
2. The seat frame according to claim 1, characterized in that, The first guiding element (108) and the second guiding element (112) each include a ball bearing.
3. The seat frame according to claim 1 or 2, characterized in that, The first elongated hole (109) has a curved shape.
4. The seat frame according to claim 1 or 2, characterized in that, The first stay bar (104) has a base body, wherein the first elongated hole (109) extends away from the base body at an angle greater than 45°.
5. The seat frame according to claim 1 or 2, characterized in that, The second elongated hole (111) has an open end.
6. The seat frame according to claim 1 or 2, characterized in that, The first stay bar (104) is pivotable relative to the leg support chassis (101) and relative to the second stay bar (105).
7. The seat frame according to claim 1 or 2, characterized in that, The second stay bar (105) is pivotable relative to the first stay bar (104) and relative to the leg support extension part (102).
8. The seat frame according to claim 1 or 2, characterized in that, The first rotation center (107) is arranged in a position-fixed manner relative to the leg support chassis (101).
9. The seat frame according to claim 1 or 2, characterized in that, The second stay bar (105) can pivot around a second rotation center (113), wherein the second stay bar (105) is fixed at the second rotation center (113) on the leg support extension part (102).
10. The seat frame according to claim 9, characterized in that, The second rotation center (113) is arranged in a position-fixed manner relative to the leg support extension part (102).
11. The seat frame according to claim 1 or 2, characterized in that, When the first stay bar (104) pivots around the first rotation center (107), the first guiding element (108) and the second guiding element (112) move in the first elongated hole (109) or the second elongated hole (111).
12. The seat frame according to claim 9, characterized in that, The second guiding element (112) is disposed between the second elongated hole (111) and the second rotation center (113).
13. The seat frame according to claim 1 or 2, characterized in that, The leg support chassis (101) is pivotable about a geometric axis of rotation, wherein a first end portion of the third tie rod (106) moves horizontally past the geometric axis of rotation during folding of the leg support chassis (101).
14. The seat frame according to claim 1 or 2, characterized in that, The leg support extension portion (102) is further retracted at a time point during the folding process of the leg support chassis (101) than in the folded state of the leg support chassis (101), wherein at the time point, the leg support chassis is folded to such an extent that the leg support chassis is on the shortest travel path between the front end portion of the seat surface frame and the floor surface, and the seat chassis is on the floor surface.
Citation Information
Patent Citations
Foldable leg holds in palm mechanism and thing to sit on
CN207477253U
Release system for furniture member leg rest assemblies
US20110248544A1