Office chair with caster safety lock

Abstract

The utility model provides an office chair of caster safety locking, including chair seat, the bottom middle part fixed mounting of chair seat has the support column, the bottom fixed connection of support has the moving support, and the moving support includes the connecting table, and the outer surface annular array fixed connection of connecting table has six support plates, and the bottom fixed mounting of support plate has the moving wheel, and the top rotation connection of connecting table has the rotary ring, and the bottom fixed connection of rotary ring has the bevel gear ring, and the outer surface lower surface annular array meshing connection of bevel gear ring has six bevel gears, and the top annular array of connecting table has set up six movable grooves, and the inside rotation connection of movable groove has bevel gear, the utility model discloses through linkage structure can lock six casters simultaneously, avoid office personnel to get up or adjust the chair slipping when the sitting posture, the use safety and stability of remarkable promotion, and only need to rotate the handle when operating, do not need to lock the caster one by one.

Description

Technical Field

[0001] This utility model relates to the field of office furniture technology, and in particular to an office chair with caster safety locking. Background Technology

[0002] Office chairs are an indispensable piece of furniture in modern office environments. They are mainly used to provide office workers with comfortable sitting support, meeting the needs of people who sit for long periods of time, frequently adjust their sitting posture, and make small movements during the work process. They are usually composed of components such as seat, backrest, armrests, and base with casters. The casters allow office chairs to move flexibly on the office floor, making it convenient for office workers to retrieve documents and equipment around their desks, or to communicate and collaborate closely with colleagues.

[0003] Existing technologies have the following shortcomings: Most existing office chair caster locking structures adopt single-point pressing or simple snap-on designs. On the one hand, these locking methods are cumbersome to operate and make it difficult to lock multiple casters simultaneously. When office workers stand up or adjust their sitting posture, the accidental slippage of a single caster may cause the entire chair to shift, affecting the user experience and even causing loss of balance and falls. On the other hand, traditional casters have a fixed direction after installation and cannot be flexibly adjusted. When office workers need to change the direction of the chair's movement, they can only adjust the angle by repeatedly pushing the chair, which is not only inconvenient to operate but also easily causes wear and tear on the floor. In addition, some office chair caster installation structures have poor stability and are prone to loosening after long-term use, posing a safety hazard. Utility Model Content

[0004] This utility model proposes an office chair with caster safety locking to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An office chair with caster safety locking includes a seat, a backrest fixedly connected to the top rear side of the seat, armrests fixedly connected to the left and right sides of the seat and the backrest, a support column fixedly installed at the bottom center of the seat, and a movable bracket fixedly connected to the bottom end of the support column. The movable support includes a connecting platform, which is fixedly connected to the bottom end of a support column. Six support plates are fixedly connected to the outer surface of the connecting platform in a circular array. A movable wheel is fixedly installed on the bottom end of the support plate away from the connecting platform. A rotating ring is rotatably connected to the top of the connecting platform. A handle is fixedly connected to the front end of the outer surface of the rotating ring. A bevel gear ring is fixedly connected to the bottom end of the rotating ring. Six bevel gears are meshed in a circular array below the outer surface of the bevel gear ring. Six movable slots are opened in a circular array on the top of the connecting platform. The bevel gears are rotatably connected inside the movable slots. A transmission screw is fixedly connected to the side of the bevel gear near the support plate. A sliding groove is opened inside the support plate. The end of the transmission screw away from the bevel gear passes through the interior of the sliding groove and is threadedly connected to a threaded sliding plate on its outer surface. The outer surface of the threaded sliding plate is slidably connected to the inner surface of the sliding groove. Push rods are movably connected to both the front and rear sides of the threaded sliding plate. A clamping column is movably connected to the end of each of the push rods away from the threaded sliding plate.

[0006] Preferably, an annular groove is formed at the bottom of the outer surface of the support column, and an annular plate is rotatably engaged with the inner surface of the annular groove. The outer surface of the annular plate is fixedly connected to the inner surface of the rotating ring.

[0007] Preferably, the movable wheel includes a connecting sleeve, and a positioning column is rotatably connected to the inner surface of the connecting sleeve. Rollers are fixedly connected to both the front and rear ends of the positioning column.

[0008] Preferably, the outer surface of the positioning post is provided with a plurality of positioning slots in a ring array, and the bottom end of the clamping post extends through to the inner side of the connecting sleeve post.

[0009] Preferably, an annular groove 2 is formed above the outer surface of the connecting sleeve column, and an annular plate 2 is rotatably engaged with the inner surface of the annular groove 2.

[0010] Preferably, a connecting nut is fixedly connected to the top end of the second annular plate, and a threaded cylinder is fixedly connected to the bottom end of the support plate on the side away from the connecting platform. The inner surface of the connecting nut is threadedly connected to the outer surface of the threaded cylinder.

[0011] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows: 1. This utility model allows the rotating ring to rotate by turning the handle. The bevel gear ring at the bottom of the rotating ring rotates accordingly, which in turn drives the six bevel gears meshing with it to rotate synchronously. The rotation of the bevel gears causes the transmission screw fixed on one side to rotate. The transmission screw drives the threaded slide plate to slide in the sliding groove through the threaded transmission. The threaded slide plate pushes the pressing column to slide through the push rod, so that the bottom end of the pressing column is locked into the positioning slot of the positioning column and presses against the positioning column, thereby restricting the rotation of the positioning column and locking the rollers. This linkage structure can lock all six casters at the same time, preventing the chair from sliding when office workers get up or adjust their sitting posture, significantly improving the safety and stability of use. Moreover, during operation, only the handle needs to be turned, without locking each caster individually, which greatly improves the convenience of use.

[0012] 2. In use, the movable wheel of this utility model is connected to the connecting sleeve column through the second annular plate and the connecting nut, allowing relative rotation between the connecting nut and the connecting sleeve column. The connecting nut is screwed onto the outer surface of the threaded cylinder column to fix the movable wheel. The relative rotational characteristics between the connecting nut and the connecting sleeve column allow the movable wheel to be freely adjusted after installation. When office workers need to change the direction of the chair, there is no need to push the chair a lot; they only need to manually adjust the direction of the casters, which is simple and labor-saving. At the same time, this design reduces the wear and tear on the ground caused by frequent chair direction adjustments, extends the service life of the floor, and improves the flexibility and convenience of using the office chair. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram of an office chair with a caster safety lock according to the present invention; Figure 2 This is a cross-sectional structural diagram of the movable support in an office chair with a caster safety lock according to the present invention; Figure 3 This is an enlarged structural diagram of the rotating ring in an office chair with a caster safety lock according to this utility model; Figure 4 This is an enlarged structural diagram of the support plate in an office chair with a caster safety locking mechanism according to this utility model; Figure 5 This is a cross-sectional schematic diagram of the movable wheel structure in an office chair with a caster safety locking system according to this utility model.

[0014] Legend: 1. Seat; 2. Backrest; 3. Armrest; 4. Support column; 41. Annular groove one; 42. Annular plate one; 5. Movable bracket; 51. Connecting platform; 52. Support plate; 53. Movable wheel; 531. Connecting sleeve column; 532. Positioning column; 533. Roller; 534. Positioning slot; 535. Annular groove two; 536. Annular plate two; 537. Connecting nut; 54. Rotating ring; 55. Handle; 56. Bevel gear ring; 57. Bevel gear; 58. Transmission screw; 59. Threaded sliding plate; 510. Push rod; 511. Clamping column; 512. Threaded cylinder column. Detailed Implementation

[0015] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0016] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0017] Example 1: As Figures 1-5As shown, this utility model provides an office chair with caster safety locking, including a seat 1, a backrest 2 fixedly connected to the top rear side of the seat 1, an armrest 3 fixedly connected to the left and right sides of the seat 1 and the backrest 2 respectively, a support column 4 fixedly installed at the bottom center of the seat 1, a movable bracket 5 fixedly connected to the bottom end of the support column 4, the movable bracket 5 including a connecting platform 51, the connecting platform 51 fixedly connected to the bottom end of the support column 4, six support plates 52 fixedly connected in a ring array on the outer surface of the connecting platform 51, a movable wheel 53 fixedly installed on the bottom end of the support plate 52 away from the connecting platform 51, a rotating ring 54 rotatably connected to the top of the connecting platform 51, a handle 55 fixedly connected to the front end of the outer surface of the rotating ring 54, a bevel gear ring 56 fixedly connected to the bottom end of the rotating ring 54, six bevel gears 57 meshing in a ring array below the outer surface of the bevel gear ring 56, six movable slots opened in a ring array on the top of the connecting platform 51, the bevel gears 57 rotatably connected inside the movable slots, the bevel gears 57 being close to the support plates. A transmission screw 58 is fixedly connected to one side of the support plate 52. A sliding groove is provided inside the support plate 52. The end of the transmission screw 58 away from the bevel gear 57 passes through the interior of the sliding groove and is threadedly connected to a threaded slide plate 59 on its outer surface. The outer surface of the threaded slide plate 59 is slidably connected to the inner surface of the sliding groove. Push rods 510 are movably connected to both the front and rear sides of the threaded slide plate 59. A clamping column 511 is movably connected to the end of the two push rods 510 away from the threaded slide plate 59. A bottom opening is provided on the outer surface of the support column 4. An annular groove 41 has an annular plate 42 rotatably engaged on its inner surface. The outer surface of the annular plate 42 is fixedly connected to the inner surface of the rotating ring 54. The moving wheel 53 includes a connecting sleeve post 531. A positioning post 532 is rotatably connected to the inner surface of the connecting sleeve post 531. Rollers 533 are fixedly connected to both the front and rear ends of the positioning post 532. Several positioning slots 534 are arranged in an annular array on the outer surface of the positioning post 532. The bottom end of the pressing post 511 extends through to the inner side of the connecting sleeve post 531.

[0018] The effect achieved by the entire embodiment 1 is as follows: When the office staff needs to fix the position of the office chair, they only need to turn the handle 55, which drives the rotating ring 54 to rotate in the annular groove 41 at the bottom of the support column 4 through the annular plate 42. The rotating ring 54 drives the bevel gear ring 56 at its bottom to rotate synchronously. The bevel gear ring 56 meshes with the six bevel gears 57, so that the six bevel gears 57 rotate simultaneously. When the bevel gears 57 rotate, the transmission screw 58 fixed on one side of it also rotates. The transmission screw 58 drives the threaded slide plate 59 to slide in the sliding groove of the support plate 52 toward the moving wheel 53 through the threaded transmission. The threaded slide plate 59 drives the... The push rod 510 moves, pushing the clamping column 511 downward until the bottom end of the clamping column 511 is engaged in the positioning slot 534 of the positioning column 532 and presses against the positioning column 532. At this time, the positioning column 532 is restricted from rotating, and the rollers 533 fixed at both ends of the positioning column 532 cannot rotate either. This achieves synchronous locking of the six moving wheels 53, effectively preventing accidental sliding of the office chair during use and improving the safety and stability of use. When it is necessary to move the office chair, the handle 55 is rotated in the opposite direction to disengage the clamping column 511 from the positioning slot 534, and the rollers 533 can resume free rotation. The operation is very convenient.

[0019] Example 2: As Figures 4-5 As shown, this utility model provides a technical solution: an annular groove 535 is provided above the outer surface of the connecting sleeve 531, an annular plate 536 is rotatably engaged on the inner surface of the annular groove 535, a connecting nut 537 is fixedly connected to the top of the annular plate 536, and a threaded cylinder 512 is fixedly connected to the bottom end of the support plate 52 on the side away from the connecting platform 51, and the inner surface of the connecting nut 537 is threadedly connected to the outer surface of the threaded cylinder 512.

[0020] The overall effect of Embodiment 2 is as follows: When installing the movable wheel 53, the connecting nut 537 is screwed onto the threaded cylinder 512 to achieve a fixed connection between the movable wheel 53 and the support plate 52. Since the connecting sleeve 531 is connected to the connecting nut 537 through the second annular plate 536, and the second annular plate 536 can rotate within the second annular groove 535, the connecting nut 537 and the connecting sleeve 531 can rotate relative to each other. When the office staff needs to change the direction of the office chair, there is no need to push the chair as a whole. They only need to manually adjust the direction of the connecting sleeve 531. The connecting sleeve 531 drives the positioning column 532 and the roller 533 to rotate, thereby adjusting the direction of the movable wheel 53. The operation is simple and labor-saving. At the same time, it reduces the wear and tear on the ground caused by repeatedly pushing the chair to adjust the direction, improves the flexibility and convenience of using the office chair, and extends the service life of the floor.

[0021] The working principle of the entire device is as follows: During daily use of the office chair, the chair moves freely by rolling the rollers 533 of the moving wheels 53 on the ground. At this time, the clamping column 511 is not engaged with the positioning slot 534 of the positioning column 532, and the positioning column 532 and the rollers 533 can rotate freely. When it is necessary to fix the position of the office chair, the user turns the handle 55, which causes the rotating ring 54 to drive the bevel gear ring 56 to rotate, thereby controlling the bevel gear 57 to drive the transmission screw 58 to rotate, so that the threaded slide plate 59 slides inside the sliding groove, and under the push of the push rod 510, the clamping column 511 is engaged with the positioning slot 533. Within 34, the rotation of the roller 533 is restricted, thus locking the office chair. When the office chair needs to be moved again, the handle 55 is rotated in the opposite direction, causing the clamping post 511 to disengage from the positioning slot 534, and the roller 533 resumes rotation, allowing the office chair to move freely. When adjusting the direction of movement of the office chair, the relative rotational characteristics between the connecting sleeve post 531 and the connecting nut 537 are utilized. The connecting sleeve post 531 is manually rotated, causing the positioning post 532 and the roller 533 to change direction, thus achieving flexible adjustment of the direction of movement of the office chair. The entire process is simple to operate, safe and reliable, and effectively meets the needs of office workers for the safety and convenience of using office chairs.

[0022] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. An office chair with safety locking casters, characterized in that: Includes a seat (1), a backrest (2) is fixedly connected to the top rear side of the seat (1), an armrest (3) is fixedly connected to the left and right sides of the seat (1) and the backrest (2), a support column (4) is fixedly installed at the bottom center of the seat (1), and a movable bracket (5) is fixedly connected to the bottom end of the support column (4). The movable support (5) includes a connecting platform (51), which is fixedly connected to the bottom end of the support column (4). Six support plates (52) are fixedly connected to the outer surface of the connecting platform (51) in a ring array. A movable wheel (53) is fixedly installed on the bottom end of the support plate (52) away from the connecting platform (51). A rotating ring (54) is rotatably connected to the top of the connecting platform (51). A handle (55) is fixedly connected to the front end of the outer surface of the rotating ring (54). A bevel gear ring (56) is fixedly connected to the bottom end of the rotating ring (54). Six bevel gears (57) are meshed in a ring array below the outer surface of the bevel gear ring (56). The top of the connecting platform (51) The annular array has six movable slots. The bevel gear (57) is rotatably connected inside the movable slot. A transmission screw (58) is fixedly connected to the side of the bevel gear (57) near the support plate (52). A sliding groove is provided inside the support plate (52). The end of the transmission screw (58) away from the bevel gear (57) passes through the interior of the sliding groove and is threadedly connected to a threaded slide plate (59) on its outer surface. The outer surface of the threaded slide plate (59) is slidably connected to the inner surface of the sliding groove. Push rods (510) are movably connected to both the front and rear sides of the threaded slide plate (59). A clamping column (511) is movably connected to the end of each of the two push rods (510) away from the threaded slide plate (59).

2. The office chair with caster safety locking according to claim 1, characterized in that: The bottom of the outer surface of the support column (4) is provided with an annular groove (41), and an annular plate (42) is rotatably engaged on the inner surface of the annular groove (41). The outer surface of the annular plate (42) is fixedly connected to the inner surface of the rotating ring (54).

3. The office chair with caster safety locking according to claim 1, characterized in that: The movable wheel (53) includes a connecting sleeve (531), and a positioning column (532) is rotatably connected to the inner surface of the connecting sleeve (531). Rollers (533) are fixedly connected to both the front and rear ends of the positioning column (532).

4. An office chair with caster safety locking according to claim 3, characterized in that: The outer surface of the positioning post (532) is provided with a number of positioning slots (534) arranged in a ring array, and the bottom end of the clamping post (511) extends through to the inner side of the connecting sleeve post (531).

5. An office chair with caster safety locking according to claim 3, characterized in that: An annular groove 2 (535) is provided above the outer surface of the connecting sleeve column (531), and an annular plate 2 (536) is rotatably engaged on the inner surface of the annular groove 2 (535).

6. An office chair with caster safety locking according to claim 5, characterized in that: The top end of the second annular plate (536) is fixedly connected to a connecting nut (537), and the bottom end of the support plate (52) is fixedly connected to a threaded cylinder (512) on the side away from the connecting platform (51). The inner surface of the connecting nut (537) is threadedly connected to the outer surface of the threaded cylinder (512).

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