Lifting mechanism for furniture

Abstract

The invention discloses lifting furniture which comprises a table top, an elastic power body, a base and a sliding sleeve assembly formed by matching a sliding outer sleeve and a sliding inner sleeve in a sliding mode and further comprises a stand column, an upper sliding block, a lower sliding block, an elastic piece, an operation rod, a pulley, a swing rod and an inhaul cable, an upper inserting hole and a lower inserting hole are formed in the sliding inner sleeve, and one end of the upper sliding block and one end of the lower sliding block are arranged on the stand column in a sleeving mode; the other ends of the upper sliding block and the lower sliding block are inserted into the upper inserting hole and the lower inserting hole respectively, the pulley is arranged on the sliding inner sleeve, one end of the inhaul cable is fixedly connected with the lower sliding block, the other end of the inhaul cable winds around the pulley upwards and then is fixedly connected with the upper sliding block downwards, and the bottom end of the operating rod is connected with the upper sliding block. One end of the swing rod extends into the sliding sleeve assembly and is rotationally connected with the sliding sleeve assembly, and the other end of the swing rod is rotationally connected with the top end of the operating rod. The sliding inner sleeve can stay at any position on the stand column, so that the table top of the lifting furniture can be fixed at any position between the adjustable maximum height and the adjustable minimum height.

Description

Technical Field

[0001] The invention relates to a lifting mechanism for furniture, belonging to the technical field of furniture. Background Art

[0002] Various tables, chairs, bookshelves, display stands and other furniture items that can be raised and lowered and can adjust the height and length generally use an adjustment mechanism with holes and toothed engagement to control the braking and positioning during lifting and retraction, such as the bedside table that can be quickly adjusted up and down disclosed in the Chinese utility model patent with the authorization announcement number CN216723646U, and the multi-stage lifting table disclosed in the invention patent of Taiwan with the application publication number TW202210004A. The adjustment mechanism with holes and toothed engagement is expensive, and because there is a distance between the holes and the teeth, it can only be locked at the holes or the meshing grooves. In order to ensure the strength and stability of the components and avoid deformation, the holes are usually set at a relatively large distance, and the actual fixed position range of the desktop of the lifting table is small. Since the tooth spacing is usually small, the tooth engagement method is better than the hole method, but due to the existence of the tooth spacing, its actual adjustment range can still be improved. Summary of the invention

[0003] One object of the present invention is to provide a lifting mechanism for furniture, so as to solve the technical defect that the table top of the lifting furniture in the prior art cannot be adjusted to any height.

[0004] In order to solve the above problems, the technical solution adopted by the present invention is: a lifting mechanism for furniture, including an elastic power body and a sliding sleeve assembly composed of a sliding outer sleeve and a sliding inner sleeve slidably matched, the elastic power body is arranged in the sliding sleeve assembly, and also includes a column, an upper slider, a lower slider, an elastic member, an operating rod, a pulley, a swing rod and a cable, an upper plug hole and a lower plug hole are opened on the sliding inner sleeve, one end of the upper slider and the lower slider are sleeved on the column, and the other ends of the upper slider and the lower slider are respectively inserted into the upper plug hole and the lower plug hole and can swing up and down in the sliding inner sleeve, the pulley is arranged on the sliding inner sleeve, and one end of the cable is fixedly connected to the lower slider, The other end of the cable passes around the pulley and is fixedly connected to the upper slider, the bottom end of the operating rod is connected to the upper slider or the lower slider, one end of the swing rod extends into the sliding sleeve assembly and is rotatably connected to the sliding sleeve assembly, and the end of the swing rod located in the sliding sleeve assembly is rotatably connected to the top of the operating rod. When the elastic member is in a relaxed state, the upper slider and the lower slider are respectively in an upward tilted and downward tilted state, and the sliding inner sleeve is locked on the column through the friction force between the upper slider and the lower slider and the column. By rotating the swing rod, the upper slider and the lower slider swing in a parallel direction to reduce the friction force between the upper slider and the lower slider and the column until the sliding inner sleeve can be raised and lowered on the column. The present invention adopts an upper slider and a lower slider to cooperate with the column, and the relative angles of the upper slider and the lower slider and the column are adjusted by the swing of the upper slider and the lower slider, thereby changing the friction between the upper slider and the lower slider and the column. Therefore, the upper slider and the lower slider in the present invention can be adjusted to stop at any position on the column, and the present invention can stop at any position between the maximum height and the minimum height bottom that the furniture table top can adjust. The present invention is convenient for resetting the upper slider and the lower slider when the cable is released by arranging an elastic member, and the elastic member makes the resetting speed of the upper slider and the lower slider fast, so that the positioning of the present invention can be quickly realized, and the accuracy of the locking position of the present invention is improved. Since the upper slider and the lower slider in the present invention are arranged on the sliding inner sleeve, when the upper slider and the lower slider are locked with the column, the sliding inner sleeve cannot move relative to the sliding outer sleeve, so that the height of the table top is fixed, and the swing rod is pulled to push the operating rod to move, so that the upper slider and the lower slider are unlocked relative to the column. At this time, the height of the table top can be adjusted up and down, and the swing rod is released, and the elastic member pushes the upper slider and the lower slider to reset, and the height of the table top is locked again.

[0005] As a further improvement of the present invention, the elastic power body is a gas spring, the cylinder of the gas spring is used to be rotatably connected with the tabletop of the furniture when in use, the piston rod of the gas spring is used to be connected with the base of the furniture or the bottom of the sliding sleeve assembly when in use, and the column is the piston rod of the gas spring. The present invention uses the piston rod of the gas spring as the column, and does not need to set up a separate column, so that the space in the sliding sleeve assembly is fully utilized.

[0006] As a further improvement of the present invention, it also includes a limit block fixed to the sliding sleeve assembly between the upper slider and the lower slider, and when the upper slider and the lower slider swing to respectively abut against the top and bottom of the limit block, the upper slider is parallel to the lower slider. The present invention is provided with a limit block to limit the swing of the upper slider and the lower slider, so as to prevent the upper slider and the lower slider from generating reverse friction with the column due to excessive swing amplitude when unlocking.

[0007] As a further improvement of the present invention, the elastic member is a spring, which is sleeved on the column, and the top and bottom ends of the spring respectively abut against the upper slider and the lower slider. The present invention adopts the spring sleeved on the column, which has a simple structure and is easy to install.

[0008] As a further improvement of the present invention, the following conditions are met when the sliding inner sleeve is locked on the column:

[0009]

[0010] Where: T is the distance between the inner surface of the sliding inner sleeve on the side where the upper and lower plug holes are opened and the center of the column along the length direction of the upper slider or the lower slider;

[0011] D is the width of the hole on the upper and lower sliders through which the column passes vertically when the upper and lower sliders are in a horizontal state;

[0012] S is the thickness of the upper and lower sliders;

[0013] d is the width of the column, and D>d;

[0014] μ1 is the friction coefficient between the upper and lower sliders and the side of the column away from the upper socket;

[0015] μ2 is the friction coefficient between the upper slider, the lower slider and the column on the side close to the upper socket.

[0016] In summary, the beneficial effects of the present invention are as follows: the sliding inner sleeve in the present invention can stay at any position on the column, so that the table top of the lifting furniture can be fixed at any position between the maximum adjustable height and the minimum adjustable height, thereby increasing the actual adjustable range of the lifting furniture table top. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the installation of the lower slider and the sliding inner sleeve.

[0018] Figure 2 It is a cross-sectional schematic diagram of the lifting furniture of the present invention in a height locked state.

[0019] Figure 3 It is a cross-sectional schematic diagram of the lifting furniture of the present invention in a state of adjusting the table top height.

[0020] Figure 4 yes Figure 2 A partial enlarged view of point A in the middle.

[0021] Figure 5 yes Figure 3 A partial enlarged view of point B in the middle.

[0022] Among them: 1. table; 2. elastic power body; 3. base; 4. sliding outer sleeve; 5. sliding inner sleeve; 6. column; 7. upper slider; 8. lower slider; 9. elastic member; 10. operating lever; 11. pulley; 12. swing arm; 13. cable; 14. upper socket; 15. lower socket; 16. limit block; 17. connecting plate; 18. caster; 19. table fixing plate; 20. upper through hole; 21. lower through hole.

[0023] Embodiment

[0024] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings. The lifting mechanism for furniture of the present invention is used on lifting furniture, wherein the lifting furniture can be a lifting table or a lifting chair, and the present invention is described by taking a lifting table as an example.

[0025] like Figures 2 to 5 The lifting furniture shown includes a table top 1, an elastic power body 2, a base 3 and a sliding sleeve assembly which is slidably matched with a sliding outer sleeve 4 and a sliding inner sleeve 5. The sliding outer sleeve 4 in the present invention is sleeved on the sliding inner sleeve 5, and the sliding inner sleeve 5 can slide vertically relative to the sliding outer sleeve 4. The cross-sectional shape of the sliding outer sleeve 4 sleeved on the sliding inner sleeve 5 is rectangular, and the sliding connection method of the two is the existing technology. The top end of the sliding inner sleeve 5 of the sliding sleeve assembly is fixedly connected to the table top 1, and the base 3 is fixedly connected to the bottom end of the sliding outer sleeve 4 of the sliding sleeve assembly. The elastic power body 2 is arranged in the sliding sleeve assembly, and the elastic power body 2 connects the table top 1 and the base 3 or connects the table top 1 and the bottom of the sliding sleeve assembly.

[0026] like Figures 1 to 5As shown, in order to achieve the up and down adjustment of the table 1, the present invention is provided with a column 6, an upper slider 7, a lower slider 8, an elastic member 9, an operating rod 10, a pulley 11, a swing rod 12 and a cable 13. An upper plug hole 14 and a lower plug hole 15 are provided on the lower part of the sliding inner sleeve 5. An upper through hole 20 and a lower through hole 21 penetrating the upper and lower sides thereof are respectively provided on one end of the upper slider 7 and the lower slider 8. The apertures of the upper through hole 20 and the lower through hole 21 are equal and slightly larger than the diameter of the column 6. One end of the upper slider 7 and the lower slider 8 are respectively sleeved on the column 6 through the upper through hole 20 and the lower through hole 21, the upper and lower heights of the upper plug hole 14 and the lower plug hole 15 are respectively greater than the thickness of the upper slider 7 and the lower slider 8, the other ends of the upper slider 7 and the lower slider 8 are respectively inserted into the upper plug hole 14 and the lower plug hole 15, and because the height of the upper plug hole 14 is greater than the thickness of the upper slider 7 and the height of the lower plug hole 15 is greater than the thickness of the lower slider 8, the upper slider 7 and the lower slider 8 can swing up and down in the sliding inner sleeve 5.

[0027] like Figures 2 to 5As shown, the pulley 11 in the present invention is rotatably arranged in the sliding inner sleeve 5 by a pulley seat fixed on the sliding inner sleeve 5, one end of the cable 13 is fixedly connected to the lower slider 8 by a rope fixing buckle, the other end of the cable 13 is passed around the pulley 11 upward and then fixedly connected to the upper slider 7 downward by a rope fixing buckle, the bottom end of the operating rod 10 is rotatably connected to the upper slider 7 by a hinge seat fixed on the upper slider 7, one end of the swing rod 12 extends from the upper end of the sliding inner sleeve 5 into the sliding sleeve assembly and is rotatably connected to the sliding inner sleeve 5 of the sliding sleeve assembly by a rotating shaft The end of the swing rod 12 located in the sliding sleeve assembly is rotatably connected to the top of the operating rod 10, and the end of the swing rod 12 away from the operating rod 10 is tilted downward. When the end of the swing rod 12 located outside the sliding inner sleeve 5 is pulled upward to rotate, the other end of the swing rod 12 presses the operating rod 10 downward, so that the operating rod 10 moves downward in the sliding sleeve assembly, thereby pushing the upper slider 7 to swing downward. The elastic member 9 of the present invention makes the upper slider 7 and the lower slider 8 in the state of tilting upward and tilting downward respectively in the relaxed state. In this state, the upper slider 7 and the lower slider 8 are respectively in the state of tilting upward and tilting downward. The friction between the slider 7 and the lower slider 8 and the column 6 locks the sliding inner sleeve 5 on the column 6. At this time, the sliding inner sleeve 6 of the sliding sleeve assembly cannot move vertically relative to the sliding outer sleeve 4, so that the height of the table 1 is fixed. When the swing rod 12 is rotated to swing the upper slider 7 downward through the operating rod 10, the upper slider 7 pulls the cable 13 on this side to move downward, and the cable 13 on the other side of the pulley 11 pulls the lower slider 8 to swing upward. The upper slider 7 and the lower slider 8 swing in parallel directions, reducing the friction between the upper slider 7 and the lower slider 8 and the column 6. The sliding inner sleeve 5 can be raised and lowered on the column 6 for adjustment. At this time, the sliding inner sleeve 5 can move up and down relative to the sliding outer sleeve 4. In this state, the height of the table top can be adjusted up and down. When the swing rod 12 is released, the elastic member 9 is reset, pushing the upper slider 7 and the lower slider 8 to swing upward and downward respectively until they are in a locked state with the column 6 to fix the adjusted table top position. The upper slider 7 and the lower slider 8 in the present invention are parallel when they are swung to be horizontal. In this state, there is no friction between the upper slider 7 and the lower slider 8 and the column 6.

[0028] like Figures 2 to 5 As shown, the elastic power body 2 in the present invention adopts a gas spring, and the end of the cylinder of the gas spring away from the piston rod is rotatably connected to the table 1, and the piston rod of the gas spring is vertically arranged downward to be connected to the base 3 or the bottom of the sliding sleeve assembly. The present invention optimally uses the piston rod of the gas spring as a column 6 to reasonably utilize the space in the sliding sleeve assembly.

[0029] like Figures 2 to 5As shown, the present invention fixes a limit block 16 between the upper slider 7 and the lower slider 8 in the sliding sleeve assembly, and both ends of the limit block 16 are fixedly connected to the inner surface of the sliding inner sleeve 5. When the upper slider 7 swings to abut against the top of the limit block 16 and the lower slider 8 swings to abut against the bottom of the limit block 16, the upper slider 7 and the lower slider 8 swing to a parallel state. In this state, the upper slider 7 cannot continue to swing downward and the lower slider 8 cannot continue to swing upward, so as to avoid friction between the upper slider 7 and the lower slider 8 and the column 6 due to excessive swinging angles.

[0030] like Figures 2 to 5 As shown, the elastic member 9 in the present invention adopts a spring, which is sleeved on the column 6, and its top and bottom ends respectively resist the upper slider 7 and the lower slider 8. In the process of the upper slider 7 swinging downward and the lower slider 8 swinging upward to a horizontal state, the upper slider 7 and the lower slider 8 squeeze the spring to shrink the spring, and when the thrust of the operating rod 10 on the upper slider 7 disappears, the spring resets and stretches, pushing the upper slider 7 to swing upward and the lower slider 8 to swing downward until the two are in a state where the tilt directions are opposite.

[0031] like Figures 2 to 5 As shown, in the present invention, a connecting plate 17 is fixed at the bottom of the sliding sleeve 4, the bottom end of the column 6 is fixedly connected to the connecting plate 17, and the connecting plate 17 is fixedly connected to the base 3. The distance between the lower surface of the connecting plate 17 and the upper surface of the base 3 is not less than the thickness of a nut. The bottom end of the column 6 is a connecting portion, the diameter of the connecting portion is smaller than the diameter of the upper portion, and an external thread is arranged on the connecting portion. The connecting portion passes downward through the connecting plate 17, and a nut that matches the thread thereof is arranged on the connecting portion. The upper surface of the connecting plate 17 abuts against the shoulder formed at the place where the diameter of the connecting portion and the column 6 changes, and the nut fixes the column 6 on the connecting plate 17. The base 3 in the present invention is detachably installed with the connecting plate 17 by using multiple bolts that pass upward through the base 3 and match the thread of the connecting plate 17, so that the base 3 is fixedly installed on the bottom end of the sliding sleeve 4.

[0032] like Figures 2 to 5 As shown, in order to facilitate the movement of the present invention when in use, the present invention is provided with a plurality of casters 18 at the bottom of the base 3, the plurality of casters 18 is at least three, and the plurality of casters 18 are not distributed in a straight line, such as the present invention detachably mounting four casters 18 on the base 3, the four casters 18 are distributed at the four vertices of a rectangle. The present invention is fixed with a table top fixing plate 19 at the top of the sliding inner sleeve 5, the table top fixing plate 19 is detachably connected to the table top 1 with a plurality of bolts, so as to facilitate fixing the table top 1 to the top of the sliding inner sleeve 5.

[0033] like Figures 2 to 5As shown, when the height of the table top 1 does not need to be adjusted, the spring pushes the upper slider 7 and the lower slider 8 to be in an inclined state, and the friction between the upper slider 7 and the lower slider 8 and the column 6 fixes the sliding inner sleeve 5 on the column 6, so that the sliding inner sleeve 5 and the sliding outer sleeve 4 cannot slide relative to each other, which plays a role in fixing the height of the table top 1. In this state, if the table top 1 is pressed downward, the column 6 generates an upward friction force on the upper slider 7 to prevent the sliding inner sleeve 5 from moving downward relative to the sliding outer sleeve 4, and when the table top 1 is lifted upward, the column 6 generates a downward friction force on the lower slider 8 to prevent the sliding inner sleeve 5 from moving upward relative to the sliding outer sleeve 4. Therefore, the present invention is When the table top 1 is subjected to downward or upward pressure, the height of the table top 1 can be maintained. When the height of the table top 1 needs to be adjusted, the swing rod 12 is pulled, and the swing rod 12 pushes the operating rod 10 to move downward. The operating rod 10 pushes the upper slide 7 to swing downward, and the upper slide block 7 swings and the lower slide block 8 is pulled by the cable 13 to swing upward. When the upper slide block 7 and the lower slide block 8 are against the limit block 16, the upper slide block 7 and the lower slide block 8 are both in a horizontal state. At this time, the gas spring pushes the table top 1 to move upward or presses the table top 1 downward to move the table top 1, thereby adjusting the height of the table top 1. After the adjustment is completed, the swing rod 12 is released, the spring is reset, and the upper slide block 7 and the lower slide block 8 are locked with the column 6.

[0034] The distance between the inner surface of the sliding inner sleeve 5 on one side where the upper plug hole 14 and the lower plug hole 15 are opened and the center of the column 6 along the length direction of the upper slider 7 or the lower slider 8 is T, that is, the distance between the force point transmitted by the sliding inner sleeve 5 to the upper slider 7 or the lower slider 8 and the center of the column 6 along the length direction of the upper slider 7 or the lower slider 8, and the width of the upper through hole 20 and the lower through hole 21 on the upper slider 7 and the lower slider 8 for the column 6 to vertically pass through when the upper slider 7 and the lower slider 8 are in a horizontal state is D. The upper through hole 20 and the lower through hole 21 are both circular holes, the column 6 is cylindrical, D is the aperture of the upper through hole 20 and the lower through hole 21, the thickness of the upper slider 7 and the lower slider 8 are both S, the width of the column 6 is d, and since the column 6 is a cylinder, d is the diameter of the column 6, and D>d, the friction coefficient between the upper slider 7 and the lower slider 8 and the side of the column 6 away from the upper socket 14 is μ1, and the friction coefficient between the upper slider 7 and the lower slider 8 and the side of the column 6 close to the upper socket 14 is μ2.

[0035] Next, the force condition of the lower slider 8 when the sliding inner sleeve 5 is lifted upward is analyzed. 力When the vertical distance between the contact point of the lower slider 8 on the side close to the lower plug hole 15 and the contact point on the side away from the lower plug hole 15 and the column 6 is Y, C is the horizontal distance between the column 6 and the side facing the lower plug hole 15, that is, the horizontal distance between the force point of the sliding inner sleeve 5 and the side of the column 6 close to the lower plug hole 15. At this time, the pressure of the lower slider 8 on the side away from the lower plug hole 15 by the column 6 is F1, and the pressure of the lower slider 8 on the side close to the lower plug hole 15 by the column 6 is F2. The sliding inner sleeve 5 is locked on the column 2 and meets the following conditions:

[0036]

[0037] When the sliding inner sleeve 5 is subjected to the downward pressing force F 力 When the upper slider 7 is subjected to the same force as the lower slider 8, the conditions to be satisfied are also the same, which will not be described in detail in this embodiment.

[0038] The parts not specifically described in the above description are all prior art, or can be implemented by prior art. Moreover, the specific implementation cases described in the present invention are only preferred implementation cases of the present invention, and are not used to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made according to the content of the patent scope of the present invention should be regarded as the technical scope of the present invention.

Claims

1. A lifting mechanism for furniture, comprising an elastic power body (2) and a sliding sleeve assembly composed of a sliding outer sleeve (4) and a sliding inner sleeve (5) in sliding cooperation, wherein the elastic power body (2) is arranged in the sliding sleeve assembly, and characterized in that: The utility model also comprises a column (6), an upper slider (7), a lower slider (8), an elastic member (9), an operating rod (10), a pulley (11), a swing rod (12) and a cable (13); an upper plug hole (14) and a lower plug hole (15) are provided on the sliding inner sleeve (5); one end of the upper slider (7) and the lower slider (8) are sleeved on the column (6); the other ends of the upper slider (7) and the lower slider (8) are respectively inserted into the upper plug hole (14) and the lower plug hole (15) and can swing up and down in the sliding inner sleeve (5); the pulley (11) is arranged on the sliding inner sleeve (5); one end of the cable (13) is fixedly connected to the lower slider (8); the other end of the cable (13) passes around the pulley (11) and is fixedly connected to the upper slider (7); the operating rod (10) is The bottom end is connected with the upper slider (7) or the lower slider (8), one end of the swing rod (12) extends into the sliding sleeve assembly and is rotatably connected with the sliding sleeve assembly, one end of the swing rod (12) located in the sliding sleeve assembly is rotatably connected with the top end of the operating rod (10), the elastic member (9) makes the upper slider (7) and the lower slider (8) respectively tilt upward and tilt downward in a relaxed state, and the sliding inner sleeve (5) is locked on the column (6) through the friction between the upper slider (7) and the lower slider (8) and the column (6), and the swing rod (12) is rotated, and the upper slider (7) and the lower slider (8) swing in a parallel direction to reduce the friction between the upper slider (7) and the lower slider (8) and the column (6) until the sliding inner sleeve (5) can be raised and lowered on the column (6).

2. The lifting mechanism for furniture according to claim 1, characterized in that: The elastic power body (2) is a gas spring. The cylinder of the gas spring is used to be rotatably connected to the tabletop (1) of the furniture when in use. The piston rod of the gas spring is used to be connected to the base (3) of the furniture or the bottom of the sliding sleeve assembly when in use. The column (6) is the piston rod of the gas spring.

3. The lifting mechanism for furniture according to claim 1, characterized in that: It also includes a limit block (16) fixed to the sliding sleeve assembly and located between the upper slider (7) and the lower slider (8); when the upper slider (7) and the lower slider (8) are swung to respectively abut against the top and bottom ends of the limit block (16), the upper slider (7) and the lower slider (8) are parallel.

4. The lifting mechanism for furniture according to claim 1, characterized in that: The elastic member (9) is a spring which is sleeved on the column (6), and the top and bottom ends of the spring respectively abut against the upper slider (7) and the lower slider (8).

5. The lifting mechanism for furniture according to claim 1, characterized in that: When the sliding inner sleeve (5) is locked on the column (2), the following conditions are met: Wherein: T is the distance between the inner surface of the sliding inner sleeve (5) on one side where the upper insertion hole (14) and the lower insertion hole (15) are opened and the center of the column (6) along the length direction of the upper slider (7) or the lower slider (8); D is the width of the hole on the upper slider (7) and the lower slider (8) through which the column (6) vertically passes when the upper slider (7) and the lower slider (8) are in a horizontal state; S is the thickness of the upper slider (7) and the lower slider (8); d is the width of the column (6), and D>d; μ1 is the friction coefficient between the upper slider (7) and the lower slider (8) and the column (6) on the side away from the upper plug hole (14); μ2 is the friction coefficient between the upper slider (7) and the lower slider (8) and the column (6) on the side close to the upper plug hole (14).

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