Localizable hand-cranking device for study desk
By designing the positioning unit in the hand-crank device of the learning table, including guide members, guide strips, positioning blocks and support arms, the problem of axial movement of the shaking handle is solved, and the stability of the use position is achieved.
Patent Information
- Application Number
- CN202420993063.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-05-09
AI Technical Summary
The hand-crank device of the existing learning table is prone to axial movement of the handle when used, resulting in unstable use position.
A positionable hand-crank device including a transmission rod, a positioning unit and a transmission sleeve is designed. The positioning unit consists of a guide member, a guide bar, a positioning block and a support arm. Through the cooperation of these components, the position of the shaking handle is maintained and stable.
By setting up a positioning unit, the axial movement of the shaking handle during use is effectively prevented, the stability of the use position is improved, and the problem of unstable use in the prior art is solved.
Smart Images
Figure CN222425647U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a hand-crank device for a study table, in particular to a positionable hand-crank device for a study table, and belongs to the technical field of hand-crank devices for study tables. Background Art
[0002] The study table is deeply loved by school-age children of different ages for its liftable function. It can be adjusted to match the height of the child, and the height can also be adjusted according to different usage scenarios. Its matching function is very outstanding.
[0003] In the prior art, when the height of the study table is adjusted, a crank is used to rotate and drive the telescopic legs. However, there are two situations when using the crank in the prior art. One is that the crank has an automatic rebound and reset function, and a certain outward pulling force needs to be provided in real time when used to overcome the automatic rebound of the crank; the other is that the crank has no rebound, and when using the crank, it will move in the axial direction and even collide with the table top; both of the above situations have a certain degree of instability in use. Utility Model Content
[0004] The technical problem to be solved by the utility model is to overcome the above-mentioned deficiencies of the prior art and provide a positionable hand-crank device for a study table.
[0005] To solve the above problems, the utility model adopts the following technical solutions: a positionable hand-cranked device for a study table, comprising a transmission rod for driving the lifting table legs to lift and lower, the transmission rod is driven to rotate by a crank, a positioning unit is arranged between the transmission rod and the crank, the positioning unit comprises a guide piece installed on the transmission rod, a transmission sleeve is connected to the crank, a cavity for accommodating the guide piece is provided on the transmission sleeve, a guide strip is provided on the guide piece, a positioning block capable of radially reciprocating along the transmission sleeve is provided on the guide strip, and a positioning hole used in conjunction with the positioning block is provided on the guide groove.
[0006] The following is a further optimization of the above solution by the present invention: the guide bar is provided with at least one.
[0007] Further optimization: the number of the guide strips is two or more and they are evenly distributed on the outside of the guide member in a circular shape.
[0008] Further optimization: the length direction of the guide strip is arranged along the axial direction of the transmission sleeve, and a guide groove used in conjunction with the corresponding guide strip is opened on the inner wall of the transmission sleeve.
[0009] Further optimization: the positioning block is arranged near the middle of the guide bar, the positioning block divides the corresponding guide bar into two sections, and the two ends of the positioning block are respectively connected to one end of the guide bar of the corresponding section of the positioning block through support arms.
[0010] Further optimization: the positioning block is arranged at one end of the guide bar, and the end of the positioning block is connected to the end of the positioning block through a support arm.
[0011] Further optimization: a notch is respectively provided at a position close to one end on a side surface of the support arm away from the guide member, and at a position close to the other end on a side surface of the support arm facing the guide member.
[0012] Further optimization: the longitudinal section of the notch is C-shaped.
[0013] Further optimization: elastic columns are detachably installed in the notches.
[0014] Further optimization: the positioning block is a trapezoidal structure, and the two side surfaces of the positioning block are inclined surfaces or curved surfaces.
[0015] Beneficial technical effects:
[0016] The utility model achieves the maintenance of the position of the crank by setting a positioning unit. For the convenience of production and manufacturing, the positioning block and the guide member are injection molded as one piece. At the same time, the transmission sleeve and the crank can also be injection molded as one piece, which reduces the processing steps. The movement of the positioning block is achieved by setting a support arm. The utility model solves the problem in the prior art that the crank is prone to axial movement when in use, resulting in an unstable position during use.
[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a schematic diagram of the structure of the utility model installed on a table leg in an embodiment;
[0019] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;
[0020] Figure 3 It is a schematic diagram of the structure of the utility model in an embodiment;
[0021] Figure 4 for Figure 3 A magnified schematic diagram of point B in the middle.
[0022] In the figure: 1-lifting table leg; 2-transmission rod; 3-elastic retaining spring; 4-reset spring; 5-transmission sleeve; 6-guide member; 7-support seat; 8-crank handle; 9-positioning hole; 10-positioning block; 11-guide strip; 12-guide groove; 13-notch; 14-elastic column; 15-support arm. DETAILED DESCRIPTION
[0023] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-restrictive manner with reference to the accompanying drawings. The same reference numerals in the above drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale.
[0024] Embodiment 1, as Figure 1-4 As shown, a positionable hand-cranked device for a study table includes a transmission rod 2 for driving a lifting table leg 1 to lift and lower. The transmission rod 2 is driven to rotate by a crank 8. The crank 8 can move axially along the transmission rod 2. A positioning unit is provided between the transmission rod 2 and the crank 8.
[0025] The positioning unit includes a guide member 6 fixedly installed on the transmission rod 2 near one end. The guide member 6 is coaxially fixedly connected to the transmission rod 2. The transmission rod 2 and the guide member 6 rotate synchronously.
[0026] A transmission sleeve 5 is integrally connected to one side of the crank 8 near one end. A cavity for accommodating a guide member 6 is provided on the transmission sleeve 5. The transmission sleeve 5 can move on the guide member 6, and the crank 8 drives the guide member 6 to rotate through the transmission sleeve 5.
[0027] At least one guide strip 11 is disposed on the outer side of the guide member 6 . The guide strips 11 may be provided in a number of two, three or more as required and are evenly distributed on the outer side of the guide member 6 in a circumferential manner.
[0028] The length direction of the guide strip 11 is arranged along the axial direction of the transmission sleeve 5. A guide groove 12 used in conjunction with the corresponding guide strip 11 is opened on the inner wall of the transmission sleeve 5. This not only facilitates the movement of the transmission sleeve 5 on the guide member 6, but also ensures synchronous transmission between the two.
[0029] The guide strip 11 is provided with a positioning block 10 which can reciprocate radially along the transmission sleeve 5, and the guide groove 12 is provided with a positioning hole 9 used in conjunction with the positioning block 10. The cooperation between the guide groove 12 and the positioning block 10 can prevent axial movement of the crank 8, thereby improving the position stability during use.
[0030] The positioning block 10 is arranged near the middle of the guide bar 11 , and the positioning block 10 divides the corresponding guide bar 11 into two sections separated by a certain distance, and the two ends of the positioning block 10 are respectively connected to one end of the corresponding two sections of the positioning block 10 through the support arms 15 .
[0031] Notches 13 are respectively provided on a side surface of the support arm 15 away from the guide member 6 near one end and on a side surface of the support arm 15 facing the guide member 6 near the other end. The longitudinal section of the notch 13 is C-shaped. This design can facilitate the swinging of the support arm 15 when the positioning block 10 moves back and forth.
[0032] The positioning block 10 is a trapezoidal structure, and the two side surfaces of the positioning block 10 are inclined surfaces or arc surfaces, which facilitates the engagement and disengagement of the positioning block 10 with the positioning hole 9 .
[0033] Elastic columns 14 are detachably installed in the notches 13 . The elastic columns 14 can be cylindrical, prismatic, elliptical, or other shapes that can ensure the function of the positioning block 10 and provide a certain deformation force or elastic force.
[0034] The elastic column 14 can be made of rubber materials with different hardness, and the hardness of the rubber is ≤50HA.
[0035] A support base 7 is also provided, and the crank handle 8 is installed on the lifting table leg 1 through the support base 7. A hole is opened on the support base 7 to accommodate one end of the transmission sleeve 5 for insertion, which can ensure the axial movement of the transmission sleeve 5 and facilitate the rotation of the transmission sleeve 5.
[0036] The transmission sleeve 5 is sleeved with a return spring 4, and an elastic retaining spring 3 is arranged near one end of the transmission sleeve 5. The two ends of the return spring 4 are respectively in contact with the support seat 5 and the elastic retaining spring 3 to drive the transmission sleeve 5 to retract inward.
[0037] One end of the support seat 7 is provided with a slot for accommodating the crank 8, which can both accommodate the crank 8 and prevent the crank 8 from rotating on its own.
[0038] When in use, the crank 8 is pulled outward and the reset spring 4 is compressed until the positioning block 10 is engaged with the positioning hole 9. At this time, the engaging force between the positioning hole 9 and the positioning block 10 is greater than or equal to the reset force of the reset spring 4, thereby maintaining the position of the crank 8.
[0039] Embodiment 2: In the above embodiment 1, the positioning block 10 may also be arranged at one end of the guide bar 11 , and the end of the positioning block 10 is connected to the end of the positioning block 10 through the support arm 15 .
[0040] The reset spring 4 is used to drive the crank 8 to extend outward. When the crank 8 is driven to retract inward and engage with the slot on the support seat 7, the positioning block 10 cooperates with the positioning hole 9, and the clamping force between the positioning block 10 and the positioning hole 9 is equal to or greater than the reset force of the reset spring 4.
[0041] The utility model achieves the maintenance of the position of the crank by setting a positioning unit. For the convenience of production and manufacturing, the positioning block and the guide member are injection molded as one piece. At the same time, the transmission sleeve and the crank can also be injection molded as one piece, which reduces the processing steps. The movement of the positioning block is achieved by setting a support arm. The utility model solves the problem in the prior art that the crank is prone to axial movement when in use, resulting in an unstable position during use.
[0042] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments are only used to illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the claims and their equivalents.
Claims
1. A positionable hand-cranked device for a study table, comprising a transmission rod (2) for driving a lifting table leg (1) to lift and lower, the transmission rod (2) being driven to rotate by a crank (8), characterized in that: A positioning unit is provided between the transmission rod (2) and the crank (8), the positioning unit comprising a guide member (6) mounted on the transmission rod (2), a transmission sleeve (5) connected to the crank (8), a cavity for accommodating the guide member (6) provided on the transmission sleeve (5), a guide strip (11) provided on the guide member (6), a positioning block (10) capable of radially reciprocating along the transmission sleeve (5) provided on the guide strip (11), and a positioning hole (9) for use in conjunction with the positioning block (10) provided on the guide groove (12).
2. A positionable hand-cranked device for a study table according to claim 1, characterized in that: The guide strip (11) is provided in at least one form.
3. The positionable hand-cranked device for a study table according to claim 1, characterized in that: The number of the guide strips (11) is two or more and they are evenly distributed on the outer side of the guide member (6) in a circumferential manner.
4. A positionable hand-cranked device for a study table according to any one of claims 1 to 3, characterized in that: The length direction of the guide strip (11) is arranged along the axial direction of the transmission sleeve (5), and a guide groove (12) for use with the corresponding guide strip (11) is provided on the inner wall of the transmission sleeve (5).
5. The positionable hand-cranked device for a study table according to claim 4, characterized in that: The positioning block (10) is arranged near the middle of the guide bar (11), and the positioning block (10) divides the corresponding guide bar (11) into two sections. The two ends of the positioning block (10) are respectively connected to one end of the guide bar (11) of the corresponding section of the positioning block (10) through supporting arms (15).
6. The positionable hand-cranked device for a study table according to claim 4, characterized in that: The positioning block (10) is arranged at one end of the guide bar (11), and the end of the positioning block (10) is connected to the end of the positioning block (10) through a supporting arm (15).
7. A positionable hand-cranked device for a study table according to claim 5 or 6, characterized in that: A notch (13) is provided on a side surface of the support arm (15) away from the guide member (6) at a position close to one end, and on a side surface of the support arm (15) facing the guide member (6) at a position close to the other end.
8. The positionable hand-cranked device for a study table according to claim 7, characterized in that: The longitudinal section of the notch (13) is C-shaped.
9. The positionable hand-cranked device for a study table according to claim 7, characterized in that: Elastic columns (14) are detachably installed in the notches (13).
10. A positionable hand-cranked device for a study table according to any one of claims 1-3, 5, 6, 8, and 9, characterized in that: The positioning block (10) is of a trapezoidal structure, and two side surfaces of the positioning block (10) are inclined surfaces or arc surfaces.