Seat chassis

Abstract

A seat chassis comprises a main seat plate, a base shell, a lifting block, a shifting fork, a backrest connecting piece, a tension spring, a front seat frame, a locking device, a positioning device, a handle assembly, a driving shaft, a driven shaft, a rear fixed shaft and a middle fixed shaft, a hinge arm is hinged to a block hinge frame, an inner rod penetrates through a rod hole to be rotationally matched with a rod hinge frame, and a sliding plate is rotationally matched with the inner rod and moves in the axial direction along with the inner rod. The locking device is hinged with the locking seat frame and is matched with the head part; the driving shaft rotates with the upper shaft hole, two ends of the rear fixed shaft are rotatably matched with the lower shaft hole, rollers at two ends of the driving shaft are matched with the arc-shaped positioning groove and the rear driving inclined surface, and rollers at two ends of the driven shaft are slidably matched with the front guide inclined surface; the front frame is rotationally matched with the driven shaft; the rear inclined frame is hinged with the middle fixed shaft; the tension spring is rotationally matched with the driving shaft and the middle fixed shaft; and the locking device is matched with the spring bolt plate. The backrest connecting rod and the main seat plate move together relative to the base shell, and meanwhile, the front seat frame rotates; and the backrest connecting piece acts and the tension spring is adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to a seat chassis. Background Art

[0002] The current existing technology, Chinese Patent No. 202220888573.2, discloses a seat chassis, including a chassis, a movable tail and a spring assembly. The chassis is provided with a placement space, and the spring assembly is arranged in an inclined shape within the placement space. The spring assembly includes an elastic fixed end and an elastic movable end, the elastic fixed end being against the chassis, and the movable tail is mounted on the chassis via a movable fulcrum. One end of the movable tail is against the elastic movable end, and the other end serves as a backrest connection end. In this seat chassis, the backrest is directly connected to the movable tail and the backrest's own tilt angle is independently adjusted through the movable tail and the spring assembly. It has the advantages of a large backrest adjustment angle and meets the user's higher comfort requirements. Furthermore, even if the user presses hard on the backrest to tilt it back to a larger angle, the seat can be relatively fixed (in position) while the backrest is tilted back, ensuring that the chair as a whole will not fall backward. At the same time, the chassis provides working space for the spring assembly through the placement space, ensuring the stable operation of the spring assembly. The problem is that when adjusting, the user needs to leave the seat cushion to adjust, which is inconvenient to use. Utility Model Content

[0003] The purpose of the utility model is to provide a seat chassis which has the characteristics of being adjustable when a person sits on the seat cushion.

[0004] The utility model is realized as follows: a seat chassis, which is special in that it includes a main seat plate, a base shell, a lifting block, a shift fork, a backrest connector, a tension spring, a front seat frame, a locking device, a positioning device, a handle assembly, a driving shaft, a driven shaft, a rear fixed shaft and a middle fixed shaft,

[0005] The main seat plate includes a frame-shaped seat plate, a side frame plate and a lock tongue plate provided on one side frame plate, and the side frame plate is provided with a driving shaft hole and a driven shaft hole;

[0006] The base shell has an upper opening and a rear opening, and includes a lifting device seat provided in the center, a block hinge frame, a locking seat frame and a rod hinge frame provided in the front, a front guide inclined surface provided at the front end of the side wall plate, an arc-shaped positioning groove and a rear driving inclined surface provided at the rear end of the side wall plate. The side wall plate is provided with a rod hole, a middle fixed shaft hole and a rear fixed shaft hole in sequence from front to back;

[0007] The lifting block includes a driven arm, an articulated arm and an active arm, and a stop groove is provided at the intersection of the active arm and the articulated arm;

[0008] The shift fork includes a fixed seat, a shift arm and a head;

[0009] The backrest connecting member includes a back fixing seat frame and an oblique driving plate provided at the end of the side frame plate, wherein the upper end of the oblique driving plate is provided with an upper shaft hole and the lower end is provided with a lower shaft hole;

[0010] The front seat frame includes a front frame and a rear oblique frame.

[0011] The positioning device includes a positioning member and a sliding plate.

[0012] The handle assembly includes an inner rod and an outer rod with a handle, wherein the inner rod is inserted into the outer rod and fixed;

[0013] The articulated arm is hinged to the block articulated frame, the driven arm is opposite to the top of the lifting device seat, the stop groove is matched with the middle fixed shaft; the rear fixed shaft and the middle fixed shaft are fixed to the rear fixed shaft hole and the middle fixed shaft hole respectively, the inner rod passes through the rod hole and rotates with the rod articulated frame, the sliding plate rotates with the inner rod and moves axially with the inner rod, the sliding plate slides and is positioned with the positioning piece fixed on the base shell below the rod articulated frame, and the end of the inner rod is fixed to the fixed seat; the locking device is hinged to the locking seat frame and cooperates with the head; the driving arm cooperates with the active arm;

[0014] The two ends of the driving shaft and the driven shaft are fixed to the driving shaft hole and the driven shaft hole respectively, the oblique driving plate of the backrest connector extends into the base shell, the driving shaft rotates with the upper shaft hole, and the two ends of the rear fixed shaft rotate with the lower shaft hole, the rollers at both ends of the driving shaft cooperate with the arc-shaped positioning grooves and the rear driving inclined surface, and the rollers at both ends of the driven shaft slide with the front guide inclined surface; the front frame rotates with the driven shaft, and the rear oblique frame is hinged with the middle fixed shaft; the tension spring rotates with the driving shaft and the middle fixed shaft; the locking device cooperates with the lock tongue plate.

[0015] The special feature of the seat chassis is that the positioning member includes two unlocking grooves and a locking groove arranged along the width direction;

[0016] The sliding plate is provided with an axle seat with an axle hole.

[0017] The inner rod is provided with two retaining ring grooves;

[0018] The inner rod passes through the shaft hole, the retaining ring and the retaining ring groove are engaged, and the shaft seat is located on the inner rod between the two retaining rings; the sliding plate cooperates with the unlocking groove and the locking groove, the inner rod moves along the axis, and the sliding plate enters the locking groove from the unlocking groove or from the locking groove into the unlocking groove; when the inner rod rotates, the suspended end of the sliding plate cooperates with the unlocking groove or the locking groove to stop, preventing the sliding plate from rotating.

[0019] The special feature of the seat chassis is that: a plug-in cavity is provided on the head of the shift fork;

[0020] The locking seat frame has two seat frame plates, and the seat frame plates are provided with guide holes;

[0021] The locking device includes a locking rod, a retaining spring, a return spring and a driving spring, and the locking rod is provided with a retaining spring groove;

[0022] The locking rod passes through the guide hole, the return spring is located between the two seat plates, the retaining spring is engaged with the retaining spring groove, the retaining spring cooperates with a seat plate and one end of the return spring, the driving spring is arranged in the plug-in cavity, the locking rod is plugged into the plug-in cavity and the end portion cooperates with the driving spring; the locking rod cooperates with the lock tongue hole on the lock tongue plate.

[0023] The special feature of the seat chassis is that it also includes a bottom shell, which has an upper opening and a rear opening, and a side wall panel provided with an outer rod hole;

[0024] The base shell is arranged in the bottom shell, the back fixing seat frame of the backrest connecting member moves in the rear opening; and the outer rod is matched with the outer rod hole.

[0025] The special feature of the seat chassis is that it also includes a groove-shaped rear tail cover.

[0026] The back fixing seat frame extends through the rear tail cover and is fixed together. The bottom of the rear tail cover is slidably matched with the rear end of the bottom shell, and the upper end is fitted with the frame-shaped seat plate.

[0027] The utility model provides a seat chassis in which the operating handle assembly is unlocked, the backrest connecting rod and the main seat plate move together relative to the base shell, and at the same time, the front seat frame rotates; the backrest connecting piece is actuated and the tension spring is adjusted to achieve the desired effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a top view of the present utility model.

[0029] Figure 2 yes Figure 1 A-A view.

[0030] Figure 3 yes Figure 2 B-B view.

[0031] Figure 4 It is a partial stereogram of the present utility model.

[0032] Figure 5 It is a three-dimensional sectional view of the present utility model.

[0033] Figure 6 This is one of the three-dimensional exploded views of the present invention.

[0034] Figure 7 This is the second three-dimensional exploded view of the present invention.

[0035] Figure 8 This is the third exploded perspective view of the present invention.

[0036] Figure 9 This is the fourth three-dimensional exploded view of the present invention.

[0037] Figure 10 This is the fifth three-dimensional exploded view of the present invention. DETAILED DESCRIPTION

[0038] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0039] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0040] like Figure 1 、 Figure 2 、 Figure 6 、 Figure 7 As shown, a seat chassis includes a main seat plate 1, a base shell 2, a lifting block 3, a shift fork 4, a backrest connector 5, a tension spring 6, a front seat frame 7, a locking device 8, a positioning device 9, a handle assembly 10, a driving shaft 11, a driven shaft 12, a rear fixed shaft 13 and a middle fixed shaft 14.

[0041] The main seat plate 1 includes a frame-shaped seat plate 1A, a side frame plate and a lock tongue plate 1B provided on one side frame plate. The side frame plate is provided with a driving shaft hole 1C1 and a driven shaft hole 1C2.

[0042] The base shell 2 has an upper opening and a rear opening, and includes a lifting device seat 21 located in the center, a block hinge frame 22, a locking seat frame 23 and a rod hinge frame 24 located at the front, a front guide slope 25 located at the front end of the side wall plate, an arc-shaped positioning groove 26 and a rear driving slope 27 located at the rear end of the side wall plate. The side wall plate is provided with a rod hole 281, a middle fixed shaft hole 282 and a rear fixed shaft hole 283 from front to back.

[0043] The lifting block 3 includes a driven arm 31, an articulated arm 32 and an active arm 33. A stop groove is provided at the intersection of the active arm 33 and the articulated arm 32.

[0044] The shift fork 4 includes a fixing base 41, a shift arm 42 and a head 43. The fixing base 41 is provided with a fixing hole for a fixed rod.

[0045] The backrest connecting member 5 includes a back fixing seat frame 51 and an oblique driving plate 52 provided at the end of the side frame plate. The oblique driving plate 52 has an upper shaft hole (not marked) at the upper end and a lower shaft hole at the lower end;

[0046] The front seat frame 7 includes a front frame 71 with a front opening and a rear oblique frame 72 with a lower opening.

[0047] The positioning device 9 includes a positioning member 91 and a sliding plate 92.

[0048] The handle assembly 10 includes an inner rod 101 and an outer rod 102 with a handle. The inner rod 101 is inserted into one end of the outer rod 102 and fixed.

[0049] The articulated arm 32 is hinged to the block articulated frame 22, the driven arm 31 is opposite to the top of the lifting device seat 21, and the stop groove and the middle fixed shaft 14 cooperate; the rear fixed shaft 13 and the middle fixed shaft 14 are fixed to the rear fixed shaft hole 283 and the middle fixed shaft hole 282 respectively, the inner rod 101 passes through the rod hole 281 on the base shell 1 and rotates with the rod articulated frame 24, the sliding plate 92 rotates with the inner rod 101 and moves axially with the inner rod 101, the sliding plate 92 is slidably matched with the positioning piece 91 fixed on the base shell 2 below the rod articulated frame 24 for positioning, and the end of the inner rod 101 is fixed to the rod fixing hole on the fixed seat 41; the locking device 8 is hinged to the locking seat frame 23 and cooperates with the head 43; the driving arm 42 cooperates with the active arm 33, and the end of the driving arm 42 is located below the active arm 33;

[0050] The two ends of the driving shaft 11 and the driven shaft 12 are fixed to the driving shaft hole 1C1 and the driven shaft hole 1C2 respectively. The oblique driving plate 52 of the backrest connector 5 extends into the base shell 2. The driving shaft 11 rotates with the upper shaft hole at the upper end of the oblique driving plate 52. The two ends of the rear fixed shaft 13 rotate with the lower shaft hole at the lower end of the driving plate 52. The rollers 111 at both ends of the driving shaft 11 cooperate with the arc-shaped positioning groove 26 and the rear driving inclined surface 27, and the rollers 121 at both ends of the driven shaft 12 slide with the front guide inclined surface 25; the front frame 71 rotates with the driven shaft 12, and the rear oblique frame 72 is hinged to the middle fixed shaft 14; the tension spring 6 rotates with the driving shaft 11 and the middle fixed shaft 14; the locking device 8 cooperates with the lock tongue plate 1B.

[0051] As a further improvement of the present invention: the positioning member 91 includes two unlocking grooves 911 and a locking groove 912 arranged along the width direction;

[0052] The sliding plate 92 is provided with an axle seat 921 with an axle hole.

[0053] The inner rod 101 is provided with two retaining ring grooves;

[0054] The inner rod 101 passes through the axial hole of the shaft seat 921, the retaining ring and the retaining ring groove are engaged, and the shaft seat 921 is located on the inner rod 101 between the two retaining rings; the sliding plate 92 cooperates with the unlocking groove 911 and the locking groove 912, and the inner rod 101 moves along the axis, and the sliding plate 92 enters the locking groove 912 from the unlocking groove 911 or enters the unlocking groove 911 from the locking groove 912; when the inner rod 101 rotates, the suspended end of the sliding plate 92 cooperates with the unlocking groove or the locking groove to stop, preventing the sliding plate 92 from rotating.

[0055] As a further improvement of the present invention: a plug-in cavity 431 is provided on the head 43 of the shift fork 4;

[0056] The locking frame 23 has two frame plates, each of which is provided with a guide hole;

[0057] The locking device 8 includes a locking rod 81, a retaining spring 82, a return spring 83 and a driving spring 84. The locking rod 81 is provided with a retaining spring groove;

[0058] The locking rod 81 passes through the guide hole on the seat frame plate and the return spring 83 located between the two seat frame plates, the retaining spring 82 is engaged with the retaining spring groove, the retaining spring 82 cooperates with one seat frame plate of the locking seat frame 23 and one end of the return spring, the other end of the return spring 83 cooperates with the other seat frame plate of the locking seat frame 23, the driving spring 84 is arranged in the plug-in cavity 431, the locking rod 81 is plugged into the plug-in cavity 431 and the end portion cooperates with the driving spring 84; the locking rod 81 cooperates with the lock tongue hole on the lock tongue plate 1B.

[0059] As a further improvement of the present invention: it further comprises a bottom shell 15, the bottom shell 15 has an upper opening and a rear opening, and an outer rod hole 151 is provided on one side wall;

[0060] The base shell 2 is arranged in the bottom shell 15 , and the back fixing seat frame 51 of the backrest connecting member 5 moves in the rear opening; the outer rod 102 is matched with the outer rod hole 151 .

[0061] Also includes a groove-shaped rear tail cover 16,

[0062] The back fixing frame 51 extends through the rear tail cover 16 and is fixed together. The bottom of the rear tail cover 16 is slidably matched with the rear end of the bottom shell 16, and the upper end is in contact with the frame-shaped seat plate 1A.

[0063] When the utility model is used, Figure 2 、 Figure 5 、 Figure 10 As shown, the handle 10 rotates clockwise, and the shift arm 42 of the shift fork 4 rotates clockwise; the shift arm 42 drives the active arm 33, and the lifting block 3 rotates counterclockwise.

[0064] Figure 3This is a view of the unlocked state of the present invention, where the handle 10 moves to the left; the shift fork 4 moves to the left and compresses the drive spring 84, which drives the lock rod 81 to the left and enters the lock bolt hole on the lock bolt plate 1B;

[0065] At the same time, the sliding plate 92 moves from the unlocking slot 911 into the locking slot 912 .

[0066] exist Figure 2 、 Figure 3 In the state shown, the backrest connector 5 rotates counterclockwise, the rollers 111 at both ends of the drive shaft 11 leave the arc-shaped positioning groove 26 and slide on the rear drive inclined surface 27, and the rollers 121 at both ends of the driven shaft 12 slide on the front guide inclined surface 25, so that the seat back tilts backward; at the same time, the tension spring 6 is stretched; then, the handle 10 moves to the left, and the locking rod 81 locks with the lock bolt hole on the lock bolt plate 1B;

[0067] When you need to adjust the seat back, pull the handle 10. Figure 3 The handle 10 is pressed, and the sliding plate 92 moves rightward from the locking groove 912 into the unlocking groove 911. Under the action of the return spring 83, the locking rod 81 leaves the lock bolt hole on the lock bolt plate 1B. Under the action of the tension spring 6, the rollers 111 at both ends of the driving shaft 11 move upward on the rear driving inclined surface 27, and the rollers 121 at both ends of the driven shaft 12 slide downward on the front guide inclined surface 25. After the adjustment is completed, the handle 10 is pressed, and the sliding plate 92 moves from the unlocking groove 911 into the locking groove 912. The locking rod 81 is locked with the lock bolt hole on the lock bolt plate 1B. The sliding plate 92 moves from the unlocking groove 911 into the locking groove 912.

[0068] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A seat chassis, characterized in that: It includes the main seat plate, base shell, lifting block, shift fork, backrest connector, tension spring, front seat frame, locking device, positioning device, handle assembly, driving shaft, driven shaft, rear fixed shaft and middle fixed shaft. The main seat plate includes a frame-shaped seat plate, a side frame plate and a lock tongue plate provided on one side frame plate, and the side frame plate is provided with a driving shaft hole and a driven shaft hole; The base shell has an upper opening and a rear opening, and includes a lifting device seat provided in the center, a block hinge frame, a locking seat frame and a rod hinge frame provided in the front, a front guide inclined surface provided at the front end of the side wall plate, an arc-shaped positioning groove and a rear driving inclined surface provided at the rear end of the side wall plate. The side wall plate is provided with a rod hole, a middle fixed shaft hole and a rear fixed shaft hole in sequence from front to back; The lifting block includes a driven arm, an articulated arm and an active arm, and a stop groove is provided at the intersection of the active arm and the articulated arm; The shift fork includes a fixed seat, a shift arm and a head; The backrest connecting member includes a back fixing seat frame and an oblique driving plate provided at the end of the side frame plate, wherein the upper end of the oblique driving plate is provided with an upper shaft hole and the lower end is provided with a lower shaft hole; The front seat frame includes a front frame and a rear oblique frame. The positioning device includes a positioning member and a sliding plate. The handle assembly includes an inner rod and an outer rod with a handle, wherein the inner rod is inserted into the outer rod and fixed; The articulated arm is hinged to the block articulated frame, the driven arm is opposite to the top of the lifting device seat, the stop groove is matched with the middle fixed shaft; the rear fixed shaft and the middle fixed shaft are fixed to the rear fixed shaft hole and the middle fixed shaft hole respectively, the inner rod passes through the rod hole and rotates with the rod articulated frame, the sliding plate rotates with the inner rod and moves axially with the inner rod, the sliding plate slides and is positioned with the positioning piece fixed on the base shell below the rod articulated frame, and the end of the inner rod is fixed to the fixed seat; the locking device is hinged to the locking seat frame and cooperates with the head; the driving arm cooperates with the active arm; The two ends of the driving shaft and the driven shaft are fixed to the driving shaft hole and the driven shaft hole respectively, the oblique driving plate of the backrest connector extends into the base shell, the driving shaft rotates with the upper shaft hole, and the two ends of the rear fixed shaft rotate with the lower shaft hole, the rollers at both ends of the driving shaft cooperate with the arc-shaped positioning grooves and the rear driving inclined surface, and the rollers at both ends of the driven shaft slide with the front guide inclined surface; the front frame rotates with the driven shaft, and the rear oblique frame is hinged with the middle fixed shaft; the tension spring rotates with the driving shaft and the middle fixed shaft; the locking device cooperates with the lock tongue plate.

2. A seat chassis according to claim 1, characterized in that: The positioning member includes two unlocking grooves and a locking groove arranged along the width direction; The sliding plate is provided with an axle seat with an axle hole. The inner rod is provided with two retaining ring grooves; The inner rod passes through the shaft hole, the retaining ring and the retaining ring groove are engaged, and the shaft seat is located on the inner rod between the two retaining rings; the sliding plate cooperates with the unlocking groove and the locking groove, the inner rod moves along the axis, and the sliding plate enters the locking groove from the unlocking groove or from the locking groove into the unlocking groove; when the inner rod rotates, the suspended end of the sliding plate cooperates with the unlocking groove or the locking groove to stop, preventing the sliding plate from rotating.

3. The seat chassis according to claim 1, characterized in that: The head of the shift fork is provided with an inserting cavity; The locking seat frame has two seat frame plates, and the seat frame plates are provided with guide holes; The locking device includes a locking rod, a retaining spring, a return spring and a driving spring, and the locking rod is provided with a retaining spring groove; The locking rod passes through the guide hole and the return spring located between the two seat plates, the retaining spring is engaged with the retaining spring groove, the retaining spring cooperates with one seat plate and one end of the return spring, and the other end of the return spring cooperates with the other seat plate. The driving spring is arranged in the plug-in cavity, the locking rod is plugged into the plug-in cavity and the end portion cooperates with the driving spring; the locking rod cooperates with the lock tongue hole on the lock tongue plate.

4. A seat chassis according to claim 1, 2 or 3, characterized in that: The bottom shell is provided with an upper opening and a rear opening, and a side wall plate is provided with an outer rod hole; The base shell is arranged in the bottom shell, the back fixing seat frame of the backrest connecting member moves in the rear opening; and the outer rod is matched with the outer rod hole.

5. The seat chassis according to claim 4, characterized in that: It also includes a groove-shaped tail cover. The back fixing seat frame extends through the rear tail cover and is fixed together. The bottom of the rear tail cover is slidably matched with the rear end of the bottom shell, and the upper end is fitted with the frame-shaped seat plate.

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