A screw rotation multiplication device

Abstract

The present invention discloses a screw push multiplication device, including a push-pull screw and a base, a rotating nut is fixed on the base, and the rotating nut is threadedly sleeved on the push-pull screw; a screw rotating mechanism is provided on the base, and the screw rotating mechanism drives the push-pull screw to rotate; a multiplication target is slidably mounted on the base, and the sliding direction of the multiplication target is consistent with the length direction of the push-pull screw, and the push-pull screw thread is inserted into the multiplication target. The significant effect of adopting this scheme is that the screw rotating mechanism drives the push-pull screw to rotate, and the push-pull screw cooperates with the fixed rotating nut thread to advance or retreat relative to the base. While the push-pull screw advances, retreats and rotates, the multiplication target cooperates with the push-pull screw thread to further advance and retreat relative to the push-pull screw, so that the advance and retreat amount of the multiplication target relative to the base is greater than the advance and retreat amount of the push-pull screw relative to the base, achieving the effect of stroke multiplication.

Description

Technical Field

[0001] The invention relates to a functional structural component of a seat, and in particular to a screw rod rotary pushing mechanism for enlarging the stroke. Background Art

[0002] Office chairs are important office tools. As office workers' demand for office chair comfort continues to increase, office chairs are gradually developing in a multifunctional direction. At this stage, in addition to meeting the needs of people sitting, multifunctional office chairs also need to meet the following needs:

[0003] 1. The seat back can be tilted, and the tilting angle can be adjusted and fixed to meet the different lying needs of passengers, such as half-lying or full-lying;

[0004] 2. The seat cushion can be flipped at a certain angle so that the front part of the seat cushion faces upward and the back part faces downward, thereby raising the knees of passengers to varying degrees;

[0005] 3. When passengers are resting, the leg rest can provide support for their legs to improve comfort.

[0006] In addition, some seats also need to meet the requirements of headrests, leg rests, and even seat cushions or backrests with retractable sliding functions, so that the headrests or backrests can be raised and lowered, or the seat cushions can be moved forward and backward, or the leg rests can be extended forward and backward to get closer to or away from the seat cushions.

[0007] To meet the above needs, engineers in related fields have some research results that can meet the corresponding needs separately. However, due to the lack of overall coordination, on the one hand, the structure used in the existing technology is not streamlined enough. On the other hand, after combining the above functions using the existing technology, the office chair structure is complex and bloated, and there is serious interference between the structures corresponding to the functions, and there are disadvantages such as heavy weight and lack of aesthetics. Therefore, it is necessary to re-plan the implementation methods of each demand and integrate the functions. During the integration process, various structural parts and linkage relationships need to be re-planned and designed.

[0008] Among them, when each functional part is linearly advanced, if a one-stage advancement is directly adopted, the length of the functional part with a longer arrival stroke will be longer and the arrival speed will be slower. Summary of the invention

[0009] In view of this, the present invention provides a two-stage linear propulsion mechanism, which has the advantage of being quickly in place. The technical solution is as follows:

[0010] A screw rod rotation and pushing multiplication device, the key of which is: comprising a push-pull screw rod and a base, a rotation nut is fixed on the base, and the rotation nut is threadedly sleeved on the push-pull screw rod;

[0011] A screw rotating mechanism is provided on the base, and the screw rotating mechanism drives the push-pull screw to rotate;

[0012] A multiplication target is slidably mounted on the base, the sliding direction of the multiplication target is consistent with the length direction of the push-pull screw, and the push-pull screw thread is inserted into the multiplication target.

[0013] The beneficial effects of adopting the above scheme are as follows: the screw rotation mechanism drives the push-pull screw to rotate, and the push-pull screw cooperates with the fixed rotating nut thread to advance or retreat relative to the base. While the push-pull screw advances and retreats and rotates, the multiplication target cooperates with the push-pull screw thread to make the multiplication target further advance and retreat relative to the push-pull screw, so that the advance and retreat amount of the multiplication target relative to the base is greater than the advance and retreat amount of the push-pull screw relative to the base, achieving the effect of doubling the stroke. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the installation structure of the leg support body 3 and the seat cushion 1;

[0015] Figure 2 It is an installation relationship diagram of the leg support body 3 and the leg support linear pull-out assembly;

[0016] Figure 3 for Figure 2 ZZ` section view;

[0017] Figure 4 for Figure 2 YY` sectional view;

[0018] Figure 5 for Figure 3 A magnified view of part A;

[0019] Figure 6 It is a schematic diagram of the assembly relationship between the push-pull screw rod 22 and the push block 27;

[0020] Figure 7 for Figure 6 A magnified view of part B;

[0021] Figure 8 Schematic diagram of the structure of the anti-friction pad 103. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with embodiments and drawings. Example

[0023] like Figure 1-8 As shown: a screw rod rotation and pushing multiplication device, comprising a push-pull screw rod 22 and a base, on which a rotation nut 24 is fixed, and the rotation nut 24 is threadedly sleeved on the push-pull screw rod 22;

[0024] A screw rotating mechanism is provided on the base, and the screw rotating mechanism drives the push-pull screw 22 to rotate;

[0025] A multiplication target 27 is slidably mounted on the base. The sliding direction of the multiplication target 27 is consistent with the length direction of the push-pull screw 22 . The push-pull screw 22 is threadedly inserted into the multiplication target 27 .

[0026] The screw rotation mechanism includes a screw driving seat 21, which is fixed on the base. A screw rotating seat 23 is rotatably mounted on the screw driving seat 21. A screw through hole is penetrated on the screw rotating seat 23. The push-pull screw 22 is inserted into the screw through hole. The push-pull screw 22 and the screw rotating seat 23 are axially slidably matched. The push-pull screw 22 and the screw rotating seat 23 are circumferentially fixed. A nut support 25 is also fixed on the screw driving seat 21, and the rotation nut 24 is fixed on the nut support 25.

[0027] The push-pull screw 22 includes a first screw section and a second screw section that are axially connected. The screw rotating seat 23 and the rotating nut 24 are respectively sleeved on the first screw section, and the multiplication target 27 is sleeved on the second screw section.

[0028] A sliding recess is provided on the outer wall of the push-pull screw 22 along its axial direction, and the sliding recess separates the thread of the push-pull screw 22. A sliding protrusion is fixed on the hole wall of the screw through hole, and the sliding protrusion corresponds to and matches the sliding recess; the sliding protrusion is axially slidably matched with the sliding recess, and the sliding protrusion is axially annularly fixed to the sliding recess. As a more specific embodiment: a sliding plane is provided on the outer wall of the push-pull screw 22 along its axial direction, and the sliding plane separates the thread of the push-pull screw 22. A sliding protrusion is fixed on the hole wall of the screw through hole 23a, and the sliding protrusion abuts against the sliding plane.

[0029] The screw rotating seat 23 is installed on the screw driving seat 21 through a bearing seat. A power element 26 is also provided on the screw driving seat 21. The power element 26 is a motor. A worm gear is fixedly mounted on the screw rotating seat 23. The motor output shaft is drivingly connected to the worm gear.

[0030] A propulsion target 28 is also slidably mounted on the base along the length direction of the push-pull screw 22 . The propulsion target 28 is axially fixedly connected to the push-pull screw 22 , and the propulsion target 28 is circumferentially rotatably connected to the push-pull screw 22 . Example

[0031] like Figure 1-8As shown: a screw rotation and pushing multiplication device in Example 1 is applied to a leg rest to obtain a one-step unfolding leg rest, comprising a seat cushion 1, a leg rest body 3 is provided at the front portion of the seat cushion 1, a leg rest linear pulling assembly is installed on the seat cushion 1, the leg rest linear pulling assembly comprises a pulling and fixing portion and a pulling and sliding portion which are slidably assembled along the front and rear directions of the seat cushion 1, wherein the pulling and fixing portion is arranged on the seat cushion 1, the front portion of the pulling and sliding portion is hinged to the leg rest body 3, and the pulling and sliding portion drives the leg rest body 3 to move forward and backward along the pulling and fixing portion; a secondary propulsion mechanism is provided on the pulling and sliding portion, the secondary propulsion mechanism is connected to the leg rest body 3, and the secondary propulsion mechanism drives the leg rest body 3 to rotate.

[0032] Specifically: the pull-out sliding part includes a leg support sliding seat and a push-pull screw 22, wherein the leg support sliding seat is slidably assembled with the pull-out fixed part, the push-pull screw 22 is axially fixedly connected to the leg support sliding seat, the push-pull screw 22 is circumferentially rotatably connected to the leg support sliding seat, the push-pull screw 22 is connected to a screw rotation mechanism, the screw rotation mechanism includes a screw driving seat 21 and a screw rotating seat 23, the screw driving seat 21 is relatively fixed with the seat cushion 1, the screw rotating seat 23 is installed on the screw driving seat 21 through a bearing seat, a screw through hole is penetrated on the screw rotating seat 23, the push-pull screw 22 is penetrated in the screw through hole, the push-pull screw 22 is axially slidably matched with the screw rotating seat 23, and the push-pull screw 22 is circumferentially fixed with the screw rotating seat 23. As a more specific implementation, a sliding recess is provided along the axial direction of the outer wall of the push-pull screw 22, and the sliding recess separates the thread of the push-pull screw 22. A sliding protrusion is fixed on the hole wall of the screw hole, and the sliding protrusion corresponds to and matches the sliding recess; the sliding protrusion is axially slidably matched with the sliding recess, and the sliding protrusion is axially annularly fixed with the sliding recess. Thus, the screw rotation mechanism drives the push-pull screw 22 to rotate;

[0033] It also includes a turning nut 24, which is relatively fixed to the seat cushion 1, and the turning nut 24 is threadedly sleeved on the push-pull screw rod 22;

[0034] The secondary propulsion mechanism includes a propulsion block, which is slidably assembled with the leg support sliding seat, and the propulsion block is threadedly sleeved with the push-pull screw 22. A flip connecting rod 29 is connected between the propulsion block and the leg support body 3, and the two ends of the flip connecting rod 29 are respectively hinged to the propulsion block and the leg support body 3. The leg support sliding seat includes a sliding inner tube 102, and the push-pull screw 22 is located inside the sliding inner tube 102 and parallel to its length direction. Both ends of the sliding inner tube 102 are fixed with sealing seats, and the two ends of the push-pull screw 22 are respectively installed on the corresponding sealing seats, and the end of the push-pull screw 22 is axially fixedly connected to the corresponding sealing seat, and the end of the push-pull screw 22 is circumferentially connected to the corresponding sealing seat. The front end of the sliding inner tube 102 is provided with a leg support mounting seat, and the leg support body 3 is hinged to the leg support mounting seat.

[0035] The screw swivel seat 23, the rotation nut 24 and the push block are all located inside the sliding inner tube 102, the push block is slidably embedded in the sliding inner tube 102, and the push block is located in front of the screw swivel seat 23 and the rotation nut 24; the push-pull screw 22 includes an axially connected first-stage screw and second-stage screw, the first-stage screw is at the rear, and the second-stage screw is at the front, the screw swivel seat 23 and the rotation nut 24 are sleeved on the first-stage screw, and the push block is sleeved on the second-stage screw, and the pitch of the first-stage screw is greater than the pitch of the second-stage screw.

[0036] The pulling and fixing part includes a guide outer cylinder 101, which is fixed on the seat cushion 1, and is arranged along the front-back direction of the seat cushion 1, and the sliding inner tube 102 is movably inserted in the guide outer cylinder 101;

[0037] In order to reduce the sliding friction of the sliding inner tube 102 in the guide outer tube 101: a friction-reducing pad 103 is provided between the guide outer tube 101 and the sliding inner tube 102, the outer wall of the friction-reducing pad 103 is pressed against the inner wall of the guide outer tube 101, a positioning protrusion 103a is provided on the outer wall of the friction-reducing pad 103, and a friction-reducing pad positioning hole is penetrated on the cylinder wall of the guide outer tube 101, the friction-reducing pad positioning hole corresponds to the positioning protrusion 103a and is mutually inserted, and a plurality of friction-reducing convex strips 103b are provided on the inner wall of the friction-reducing pad 103, and the friction-reducing convex strips 103b are pressed against the inner wall of the sliding inner tube 102; the guide outer tube 101 and the sliding inner tube 102 are both rectangular tubes, the friction-reducing pad 103 is "C"-shaped, there are two friction-reducing pads 103, the two friction-reducing pads 103 are arranged opposite to each other, and the edges of the two friction-reducing pads 103 are spaced apart from each other.

[0038] A driving clearance hole is penetrated on the wall of the guide outer tube 101, and a strip-shaped sliding clearance hole is provided on the sliding inner tube 102 along its length direction. The driving clearance hole corresponds to and is connected with the sliding clearance hole. The screw driving seat 21 extends into the interior of the sliding inner tube 102 from the driving clearance hole and the sliding clearance hole in turn. A nut support 25 is also fixed on the screw driving seat 21, and the rotation nut 24 is fixed on the nut support 25. The propulsion block includes a propulsion slider 271 and a propulsion arm 272. The propulsion slider 271 moves Embedded in the sliding inner tube 102, the propulsion slider 271 is threadedly sleeved on the push-pull screw 22, and a strip-shaped propulsion clearance port is also provided on the guide outer tube 101 along its length direction, and the propulsion clearance port corresponds to and is connected with the sliding clearance hole, the propulsion arm 272 is tilted, the upper end of the propulsion arm 272 is fixed to the propulsion slider 271, and the lower part of the propulsion arm 272 extends out from the sliding clearance hole and the propulsion clearance port in turn, and the lower end of the propulsion arm 272 faces the leg support body 3 and is hinged to the flip connecting rod 29.

[0039] The screw drive seat 21 is fixed to the outer wall of the guide outer cylinder 101, and a power element 26 is also provided on the screw drive seat 21. The power element 26 can be a motor. A worm gear is fixedly mounted on the screw rotating seat, and the motor output shaft is connected to the worm gear. Therefore, when the motor output shaft rotates, it drives the push-pull screw 22 to rotate; while the push-pull screw 22 rotates, due to the threaded fit with the turning nut 24, the push-pull screw 22 will stretch forward and backward along the turning nut 24, thereby driving the sliding inner tube 102 to slide forward and backward in the guide outer cylinder 101. At this time, the friction-reducing convex strip 103b can reduce the sliding contact area and thus reduce the friction force; the leg support body 3 installed at the front end of the sliding inner tube 102 is driven to stretch forward and backward so that the leg support moves in / out of the seat. Since the above push-pull screw 22 and other parts are built into the sliding inner tube 102, the appearance is simple and beautiful, and the modular design is convenient for assembly and combination.

[0040] The sliding inner tube 102 in this embodiment serves as the propulsion target 28, the propulsion block serves as the multiplication target 27, and the seat cushion 1 serves as the base. The flip connecting rod 29 is located below the hinge point between the leg rest body 3 and the leg rest mounting seat. When the push-pull screw 22 drives the sliding inner tube 102 to slide forward and backward, the propulsion block moves forward and backward accordingly. During this process, the push-pull screw 22 keeps rotating, which drives the propulsion block to slide forward and backward relative to the push-pull screw 22, thereby pushing the leg rest body 3 to flip. As a result, while the leg rest body 3 is driven to move forward out of the seat, the leg rest body 3 is flipped and spread out to a use state in one step; while the leg rest body 3 is driven to move backward into the seat, the leg rest body 3 is flipped and erected to a standby state in one step; the use of a simple structure improves efficiency and saves time.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention, and such changes all fall within the scope of protection of the present invention.

Claims

1. A screw rotation multiplication device, characterized in that: The invention comprises a seat cushion (1), the seat cushion (1) serving as a base, a leg support body (3) being provided at the front of the seat cushion (1), a leg support linear pull-out assembly being mounted on the seat cushion (1), the leg support linear pull-out assembly comprising a pull-out fixing portion and a pull-out sliding portion which are slidably assembled along the front-rear direction of the seat cushion (1), wherein the pull-out fixing portion is arranged on the seat cushion (1), the front portion of the pull-out sliding portion is hinged to the leg support body (3), and the pull-out sliding portion drives the leg support body (3) to move forward and backward along the pull-out fixing portion; a secondary propulsion mechanism is provided on the pull-out sliding portion, the secondary propulsion mechanism is connected to the leg support body (3), and the secondary propulsion mechanism drives the leg support body (3) to rotate; The pull-out sliding portion comprises a leg support sliding seat and a push-pull screw (22), wherein the leg support sliding seat is slidably assembled with the pull-out fixed portion, the push-pull screw (22) is axially fixedly connected to the leg support sliding seat, the push-pull screw (22) is circumferentially rotatably connected to the leg support sliding seat, the push-pull screw (22) is connected to a screw rotating mechanism, the screw rotating mechanism comprises a screw driving seat (21) and a screw rotating seat (23), the screw driving seat (21) is relatively fixed to the seat cushion (1), the screw rotating seat (23) is installed on the screw driving seat (21) through a bearing seat, a screw through hole is penetrated on the screw rotating seat (23), the push-pull screw (22) is connected to the leg support sliding seat, and the push-pull screw (22) is connected to the leg support sliding seat. (22) is inserted into the screw hole, the push-pull screw (22) and the screw rotating seat (23) are axially slidably matched, the push-pull screw (22) and the screw rotating seat (23) are circumferentially fixed, and a sliding recessed portion is provided on the outer wall of the push-pull screw (22) along its axial direction, and the sliding recessed portion separates the thread of the push-pull screw (22), and a sliding protrusion is fixed on the hole wall of the screw hole, and the sliding protrusion corresponds to and matches the sliding recessed portion; the sliding protrusion and the sliding recessed portion are axially slidably matched, and the sliding protrusion and the sliding recessed portion are axially circumferentially fixed, and the screw rotating mechanism drives the push-pull screw (22) to rotate; It also includes a turning nut (24), the turning nut (24) and the seat cushion (1) are relatively fixed, and the turning nut (24) is threadedly sleeved on the push-pull screw rod (22); The secondary propulsion mechanism comprises a propulsion block, which is slidably assembled with the leg support sliding seat, and the propulsion block is threadedly sleeved with the push-pull screw (22). A flip connecting rod (29) is connected between the propulsion block and the leg support body (3), and the two ends of the flip connecting rod (29) are respectively hinged to the propulsion block and the leg support body (3). The leg support sliding seat comprises a sliding inner tube (102), and the push-pull screw (22) is located inside the sliding inner tube (102) and parallel to its length direction. Both ends of the sliding inner tube (102) are fixed with sealing seats, and the two ends of the push-pull screw (22) are respectively installed on the corresponding sealing seats, and the end of the push-pull screw (22) is axially fixedly connected to the corresponding sealing seat, and the end of the push-pull screw (22) is circumferentially connected to the corresponding sealing seat. The front end of the sliding inner tube (102) is provided with a leg support mounting seat, and the leg support body (3) is hinged to the leg support mounting seat; The screw rotating seat (23), the rotating nut (24) and the pushing block are all located inside the sliding inner tube (102), the pushing block is slidably embedded in the sliding inner tube (102), and the pushing block is located in front of the screw rotating seat (23) and the rotating nut (24); The push-pull screw (22) comprises a first screw section and a second screw section which are axially connected, the first screw section is at the rear and the second screw section is at the front, the screw rotating seat (23) and the rotating nut (24) are sleeved on the first screw section, and the pushing block is sleeved on the second screw section; A multiplication target (27) is slidably mounted on the base, the sliding direction of the multiplication target (27) being consistent with the length direction of the push-pull screw (22), and the push-pull screw (22) is threadedly inserted into the multiplication target (27); The advancement block is the multiplication target (27).

2. A screw rotation multiplication device according to claim 1, characterized in that: A nut support (25) is also fixed on the screw drive seat (21), and the rotation nut (24) is fixed on the nut support (25).

3. A screw rotation multiplication device according to claim 1 or 2, characterized in that: A power element (26) is also provided on the screw drive seat (21), and the power element (26) is in driving connection with the screw rotating seat (23).

4. A screw rotation multiplication device according to claim 3, characterized in that: A sliding plane is provided on the outer wall of the push-pull screw rod (22) along its axial direction, the sliding plane separating the thread of the push-pull screw rod (22), and a sliding protrusion is fixed on the hole wall of the screw rod, the sliding protrusion abutting against the sliding plane.

5. A screw rotation multiplication device according to claim 4, characterized in that: The power element (26) is a motor, a worm gear is fixedly mounted on the screw seat (23), and the motor output shaft is drivingly connected to the worm gear.

6. A screw rotation multiplication device according to claim 1 or 2, characterized in that: A propulsion target (28) is also slidably mounted on the base along the length direction of the push-pull screw (22), the propulsion target (28) being axially fixedly connected to the push-pull screw (22), and the propulsion target (28) being circumferentially rotatably connected to the push-pull screw (22); The sliding inner tube (102) is the propulsion target (28).

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