Adjustable support arm

Abstract

The invention discloses an adjustable supporting arm which comprises a supporting arm fixing base, a supporting arm base capable of horizontally reciprocating around a shaft relative to the supporting arm fixing base, a supporting arm connecting base keeping reciprocating motion in the same plane with the supporting arm fixing base, and a supporting arm connector keeping parallel motion with the supporting arm connecting base. The first supporting arm is used for connecting the supporting arm fixing base and the supporting arm connecting base, the second supporting arm is used for connecting the supporting arm fixing base and the supporting arm connector, the first supporting arm is connected with the second pin shaft through a first pin shaft, and the second supporting arm is connected with the fourth pin shaft through a third pin shaft. The adjustable support arm achieves moment balance within the operation range among the load, the elastic force and the damping.

Description

Technical Field

[0001] The present invention relates to the field of medical and aesthetic medical equipment, and particularly to an adjustable support arm for the medical field with an adjustable load range and multi-angle hovering in the height and horizontal directions. Background Art

[0002] Medical adjustable support arms are often used for mounting small devices and medical probes whose mounting positions need to be adjusted. With the progress and development of medical technology, more and more life detection, treatment, maintenance, and support devices have been invented for clinical use. These devices generally need to be fully or partially placed around patients, and the auxiliary function of this small adjustable support arm is obvious. Currently, the existing support arms have relatively single functions, are inconvenient to adjust, have a small adjustment range, or are costly and occupy a large area, and cannot meet the adjustment and mounting needs of more and more devices. Summary of the Invention

[0003] The main object of the present invention is to provide an adjustable support arm to solve the technical problems in the background art.

[0004] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] An adjustable support arm includes: a support arm fixed seat, a first support arm, and a second support arm. One end of the support arm fixed seat is swingably connected to one end of the first support arm through a first pin shaft, and the other end of the first support arm is swingably connected to the second support arm through a support arm connection seat. It further includes:

[0006] The support arm base is connected to one end of the support arm fixed seat through a rotating shaft, and the support arm fixed seat and the support arm base can rotate freely relative to each other;

[0007] Both ends of the support arm connection seat are respectively provided with a second pin shaft and a third pin shaft, and the second pin shaft and the third pin shaft are respectively rotatably connected to the first support arm and the second support arm.

[0008] The fixed end of the support arm connection head is rotatably provided with a fourth pin shaft, and the support arm connection head is swingably connected to one end of the second support arm through the fourth pin shaft;

[0009] The support arm connection seat and the support arm connection head always remain parallel to each other at any operating position.

[0010] Furthermore, a first rotation center is jointly provided on the support arm fixed seat and the support arm connection seat, and a first connection bar is swingably connected between the first rotation centers on the support arm fixed seat and the support arm connection seat. The rotation central axis in the first rotation center and the rotation central axes of the first pin shaft and the second pin shaft on the first support arm form a first parallelogram structure.

[0011] Furthermore, a second rotation center is commonly provided on the arm connecting seat and the arm connecting head. A second connecting bar is swingably connected between the two second rotation centers. The rotation axis of the second rotation center forms a second parallelogram structure with the rotation axes of the third pin shaft and the fourth pin shaft.

[0012] Furthermore, a first one-way rotation assembly is provided on the arm fixing seat, and the first one-way rotation assembly is used for locking the one-way rotation of the first pin shaft relative to the arm fixing seat or the first arm.

[0013] Furthermore, a second one-way rotation assembly is also provided on the arm connecting seat. The second one-way rotation assembly is used for locking the one-way rotation of the third pin shaft relative to the second arm or the arm connecting seat.

[0014] Furthermore, one of the fulcrums of the first parallelogram is a first common rotating shaft, and a fifth rotating shaft is additionally provided. A first elastic assembly is connected between the first common rotating shaft and the fifth rotating shaft.

[0015] Furthermore, the second pin shaft is non-rotatable relative to the arm connecting seat and rotatable relative to the first arm.

[0016] Furthermore, one of the fulcrums of the second parallelogram is a second common rotating shaft, and a sixth rotating shaft is additionally provided. A second elastic assembly with an adjustable force value is installed between the second common rotating shaft and the sixth rotating shaft.

[0017] Furthermore, the fourth pin shaft is non-rotatable relative to the arm connecting head and rotatable relative to the second arm.

[0018] Furthermore, reed pieces are installed on the first pin shaft and the second pin shaft, and reed pieces are also installed on the third pin shaft and the fourth pin shaft. An adjusting shim is provided on one side of the reed piece, and the adjusting shim is tightly attached to the reed piece.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] In any operating position of the arm connecting seat and the arm connecting head of the present invention, they always remain parallel to each other. Moment balance is achieved within the full stroke of the arm operation by the load, elastic force, and damping. The load range can be adjusted widely, and it can hover at multiple positions. The structure is reliable and stable, the operation is convenient, and the cost is controllable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a perspective view of the present invention;

[0022] Figure 2 is an exploded view of the present invention;

[0023] Figure 3 is a schematic diagram of the acting force of the present invention;

[0024] Figure 4 is a partial sectional view of the present invention;

[0025] Figure 5 is a partial sectional view of another angle of the present invention;

[0026] Figure 6 is a schematic diagram of the force analysis structure;

[0027] Figure 7 is a required balanced force curve graph;

[0028] Figure 8 is a schematic diagram of the force analysis structure of the present invention;

[0029] Figure 9 is a moment balance curve graph of the present invention.

[0030] Reference numerals

[0031] 1. Boom fixing seat; 2. Boom base; 3. Boom connecting seat; 4. Boom connecting head; 5. First boom; 6. Second boom; 7. First connecting bar; 8. Second connecting bar; 9. First pin shaft; 10. Second pin shaft; 11. Third pin shaft; 12. Fourth pin shaft; 13. One-way rotation assembly; 14. Fifth rotating shaft; 15. Sixth rotating shaft; 16. First elastic assembly; 17. Second elastic assembly; 18. Reed; 19. Adjusting gasket. Detailed implementation manners

[0032] The following elaborates on the preferred embodiments of the present invention with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making the protection scope of the present invention more clearly defined.

[0033] See Figures 1-5 As shown, an adjustable boom includes: a boom fixing seat, a first boom, and a second boom. One end of the boom fixing seat is swingably connected to one end of the first boom through a first pin shaft. The other end of the first boom is swingably connected to the second boom through a boom connecting seat. It further includes:

[0034] The boom base is connected to one end of the boom fixing seat through a rotating shaft, and the boom fixing seat and the boom base can rotate freely relative to each other;

[0035] Both ends of the boom connecting seat are respectively installed with a second pin shaft and a third pin shaft, and the second pin shaft and the third pin shaft are respectively rotatably connected to the first boom and the second boom.

[0036] The fixed end of the boom connecting head is rotatably installed with a fourth pin shaft, and the boom connecting head is swingably connected to one end of the second boom through the fourth pin shaft;

[0037] The boom connecting seat and the boom connecting head always remain parallel to each other at any operating position.

[0038] A first rotation center is jointly provided on the boom fixing seat and the boom connecting seat. A first connecting bar is swingably connected between the first rotation centers on the boom fixing seat and the boom connecting seat. The rotation central axis in the first rotation center and the rotation central axes of the first pin shaft and the second pin shaft on the first boom form a first parallelogram structure.

[0039] A second rotation center is jointly provided on the boom connecting seat and the boom connecting head. A second connecting bar is swingably connected between the two second rotation centers. The rotation central axis of the second rotation center and the rotation central axes of the third pin shaft and the fourth pin shaft form a second parallelogram structure.

[0040] A first one-way rotation assembly is provided on the boom fixing seat. The first one-way rotation assembly is used for locking the one-way rotation of the first pin shaft relative to the boom fixing seat or the first boom.

[0041] A second one-way rotation assembly is also provided on the boom connecting seat. The second one-way rotation assembly is used for locking the one-way rotation of the third pin shaft relative to the second boom or the boom connecting seat.

[0042] It should be noted that the pin shaft at the position of the one-way rotation assembly only forms a one-way rotation lock relative to one connection end. That is, when the first pin shaft forms a one-way rotation lock relative to the boom fixing seat, it can rotate freely relative to the first boom. On the contrary, when it forms a one-way lock relative to the first boom, it can rotate freely relative to the boom fixing seat. At the same time, a damping structure is provided between the pin shaft and the corresponding connection end.

[0043] One of the fulcrums of the first parallelogram is the first common rotating shaft, and a fifth rotating shaft is additionally provided. A first elastic component is connected between the first common rotating shaft and the fifth rotating shaft.

[0044] The second pin shaft is non-rotatable relative to the boom connecting seat and rotatable relative to the first boom.

[0045] One of the fulcrums of the second parallelogram is the second common rotating shaft, and a sixth rotating shaft is additionally provided. A second elastic component with an adjustable force value is installed between the second common rotating shaft and the sixth rotating shaft.

[0046] The fourth pin shaft is non-rotatable relative to the boom connecting head and rotatable relative to the second boom.

[0047] Reed pieces are installed on the first pin shaft and the second pin shaft. The first boom can rotate after overcoming the damping and cannot rotate when the damping is not overcome. Different damping values are achieved by adding adjustment shims with different thicknesses.

[0048] A reed is added to the third pin and the fourth pin to achieve the damping effect of the pin relative to the second arm. The second arm can rotate after overcoming the damping and cannot rotate when the damping is not overcome. By adding shims with different thicknesses, different damping values can be achieved.

[0049] The adjustable arm reaches moment balance within the operating range among load, elastic force and damping.

[0050] The following conducts a force analysis on the arm. Refer to Figure 6 as shown below:

[0051] Taking point P as the balance point:

[0052]

[0053] According to Equation 1, calculate the force value required for balance.

[0054] Theoretically, the arm reaches balance at the position we need. The force condition is shown in Figure 7 as shown; obviously, it is very difficult to achieve the above force curve only by relying on the spring or elastic element; the ordinary elastic element F3' is linear and it is very difficult to achieve force balance.

[0055] For the balanced force of the arm, the simplified model is shown in Figure 8 as shown. Taking point O as the balance point of the arm, in the theoretical balance state, between the elastic force moment and the gravity moment:

[0056]

[0057] Refer to Figure 9 as shown. By Mb = |Mg - Ms|, judge the moment difference that generates balance between the elastic moment and the gravity moment; Ma =, through the average data combined with the value of Mu = Max(Mb), find the optimal balance point.

[0058] Theoretically, M1 + M2 + M3 + M4 + M5 > Mu, then the entire arm system will reach balance, enabling the arm to hover at any position under the designed load state;

[0059] The present invention focuses on the design of the two rotation points of M1 and M2, and M3, M4, and M5 are brought into the load as the system's self - resistance moment or ignored;

[0060] In the present invention, when the arm rotates counterclockwise, the resistance moment load is designed as M1 + M2 > Mu to ensure that the arm hovers at any position; when the arm rotates clockwise, in order to ensure labor - saving movement, M1 + M2 > Mb1 (the moment at the highest point).

[0061] This patent focuses on additionally designing adjustable resistance torques at M1 and M2 to meet the resistance torque requirements of different hanging weights. However, it is not limited to this. According to the structural and force requirements, resistance torques can be added at M3, M4, and M5.

[0062] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. Any equivalent modifications or changes made by those of ordinary skill in the art according to the disclosure of the present invention should be included in the protection scope recorded in the claims.

Claims

1. An adjustable support arm, comprising: The boom fixing seat (1), the first boom (5) and the second boom (6). One end of the boom fixing seat (1) is swingably connected to one end of the first boom (5) through a first pin shaft (9). The other end of the first boom (5) is swingably connected to the second boom (6) through a boom connecting seat (3). It is characterized in that: further comprising: The boom base (2) is connected to one end of the boom fixing seat (1) through a rotating shaft, and the boom fixing seat (1) and the boom base (2) can rotate freely relative to each other; Both ends of the boom connecting seat (3) are respectively provided with a second pin shaft (10) and a third pin shaft (11), and the second pin shaft (10) and the third pin shaft (11) are respectively rotatably connected to the first boom (5) and the second boom (6). The fixed end of the boom connecting head (4) is rotatably provided with a fourth pin shaft (12), and the boom connecting head (4) is swingably connected to one end of the second boom (6) through the fourth pin shaft (12); The boom connecting seat (3) and the boom connecting head (4) always remain parallel to each other at any operating position.

2. The adjustable support arm according to claim 1, characterized in that, A first rotation center is jointly provided on the boom fixing seat (1) and the boom connecting seat (3). A first connecting bar (7) is swingably connected between the first rotation centers on the boom fixing seat (1) and the boom connecting seat (3). The rotation central axis in the first rotation center forms a first parallelogram structure with the rotation central axes of the first pin shaft (9) and the second pin shaft (10) on the first boom (5).

3. The adjustable support arm according to claim 1, wherein, A second rotation center is jointly provided on the boom connecting seat (3) and the boom connecting head (4). A second connecting bar (8) is swingably connected between the two second rotation centers. The rotation central axis of the second rotation center forms a second parallelogram structure with the rotation central axes of the third pin shaft (11) and the fourth pin shaft (12).

4. The adjustable support arm according to claim 1, wherein A first one-way rotation assembly (13) is provided on the boom fixing seat (1), and the first one-way rotation assembly (13) is used for locking the one-way rotation of the first pin shaft (9) relative to the boom fixing seat (1) or the first boom (5).

5. The adjustable support arm according to claim 1, characterized in that, A second one-way rotation assembly (13) is also provided on the boom connecting seat (3), and the second one-way rotation assembly (13) is used for locking the one-way rotation of the third pin shaft (11) relative to the second boom (6) or the boom connecting seat (3).

6. The adjustable support arm according to claim 2, wherein One of the fulcrums of the first parallelogram is a first common rotating shaft, and a fifth rotating shaft (14) is further provided. A first elastic component (16) is connected between the first common rotating shaft and the fifth rotating shaft (14).

7. The adjustable support arm according to claim 2, characterized in that, The second pin shaft (10) is non-rotatable relative to the boom connecting seat (3) and rotatable relative to the first boom (5).

8. The adjustable support arm according to claim 3, characterized in that, One of the fulcrums of the second parallelogram is a second common rotating shaft, and a sixth rotating shaft (15) is further provided. A second elastic component (17) with an adjustable force value is installed between the second common rotating shaft and the sixth rotating shaft (15).

9. The adjustable support arm according to claim 3, wherein, The fourth pin shaft (12) is non-rotatable relative to the boom connecting head (4) and rotatable relative to the second boom (6).

10. The adjustable support arm according to claim 4, characterized in that, The first pin shaft (9) and the second pin shaft (10) are provided with reed pieces (18), and the third pin shaft (11) and the fourth pin shaft (12) are also provided with reed pieces (18). An adjusting shim (19) is provided on one side of the reed piece (18), and the adjusting shim (19) is closely attached to the reed piece (18).

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