Folding arm and medical trolley

Abstract

The invention discloses a folding arm and a medical trolley. The folding arm comprises an upper supporting arm, a lower supporting arm, a displayer connecting piece, a supporting arm connecting piece and a base. The upper supporting arm comprises an upper arm top supporting frame and an upper arm bottom supporting frame which form a parallelogram mechanism with the displayer connecting piece and the supporting arm connecting piece, and a first tension spring connected between the upper arm top supporting frame and the upper arm bottom supporting frame, and the first tension spring provides tension to enable the upper supporting arm to be kept in a hovering state. The lower supporting arm comprises a lower arm top supporting frame, a lower arm bottom supporting frame, a second tension spring and a third tension spring, wherein the lower arm top supporting frame, the lower arm bottom supporting frame, the supporting arm connecting piece and the base form a parallelogram mechanism, the second tension spring and the third tension spring are connected between the lower arm top supporting frame and the lower arm bottom supporting frame, and the second tension spring and the third tension spring provide tension so that the lower supporting arm can be kept in a hovering state. The tension spring is adopted to directly replace a traditional compression spring assembly with various parts, the internal structure of the upper supporting arm and the internal structure of the lower supporting arm are simplified, and the advantages of being few in part, easy to assemble and low in production cost are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to a folding arm and a medical trolley. Background Art

[0002] The support arms used in existing cart-type ultrasound equipment are generally divided into two types: fixed support arms and floating support arms.

[0003] Fixed support arms are usually called straight arms or C-arms; the connection method is generally that one end of the straight arm (base) is connected to the keyboard, and the other end is fixed to the monitor. Its structure does not have the function of lifting and floating or pulling forward and backward. Floating support arms are divided into two structural forms: zigzag arms and folding arms.

[0004] like Figure 1 As shown, the zigzag arm includes an upper support arm and a lower support arm. The upper support arm can float up and down at a limited angle, and the lower support arm does not have a floating function of direct forward and backward stretching, but the display can be stretched forward by rotating the lower support arm around the support base.

[0005] like Figure 2 As shown, the folding arm includes two upper and lower arms, and the two arms can realize multiple angles and up and down lifting and hovering functions. A compression spring assembly is provided in the arm of the folding arm to realize the opening or folding of a pair of arms, such as Figure 3 As shown, the compression spring assembly includes a movable rod 001, a guide rod body 002, a main body plug cover 003, a compression spring 004, a limit sleeve 005, a piston ring 006, an anti-slip fixing nut 007, an adjusting nut 008, a positioning pin shaft 009, a sliding block 010 and other parts. The overall structure of the compression spring assembly is complex, the components are numerous, and the processing cost is high. The overall structure of the compression spring assembly is complex, the components are numerous, and the processing cost is high. Summary of the invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the compression spring assembly in the folding arm of the medical trolley in the prior art, such as complex structure, many components and high processing cost, so as to provide a folding arm and a medical trolley.

[0007] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0008] A folding arm, comprising an upper support arm and a lower support arm, wherein one end of the upper support arm is connected to a display connector, the other end of the upper support arm is connected to one end of the lower support arm through an arm connector, and the other end of the lower support arm is connected to a base;

[0009] The upper support arm includes an upper arm top support frame, an upper arm bottom support frame, and a first tension spring elastically connected between the upper arm top support frame and the upper arm bottom support frame; the upper arm top support frame, the upper arm bottom support frame, the display connecting piece, and the support arm connecting piece constitute a deformable first polygonal mechanism; the first tension spring provides a pulling force for the upper arm bottom support frame so that the first polygonal mechanism maintains a fixed shape and enables the upper support arm to maintain a suspended state.

[0010] Furthermore, the lower support arm includes a lower arm top support frame, a lower arm bottom support frame, and a second tension spring and a third tension spring elastically connected between the lower arm top support frame and the lower arm bottom support frame; the lower arm top support frame, the lower arm bottom support frame, the support arm connecting piece and the base constitute a deformable second polygonal mechanism; the second tension spring and the third tension spring are cross-arranged, and the second tension spring and the third tension spring provide tension to the lower arm top support frame and the lower arm bottom support frame so that the second polygonal mechanism maintains a fixed shape and the lower support arm can maintain a suspended state.

[0011] Furthermore, under the tension of the first tension spring, the upper support arm maintains a hovering state at any position within a movable range of ±45° relative to a horizontal plane in a vertical plane with the support arm connector as the rotation center.

[0012] Furthermore, under the tension of the second tension spring and the third tension spring, the lower support arm maintains a hovering state at any position within a movable range of ±45° relative to the plumb plane in a vertical plane with the base as the rotation center.

[0013] Furthermore, the opposite ends of the upper arm top support frame are respectively hinged between the display connecting member and the support arm connecting member through respective upper arm top rotating shafts; the opposite ends of the upper arm bottom support frame are respectively hinged between the display connecting member and the support arm connecting member through respective upper arm bottom rotating shafts.

[0014] Furthermore, one end of the first tension spring is hooked on the upper arm top shaft hinged between the upper arm top support frame and the support arm connector, and the other end of the first tension spring is hooked on one end of the upper arm bottom support frame close to the display connector.

[0015] Furthermore, a first slot is provided on one side of the upper arm bottom support frame facing the upper arm top support frame, and the other end of the first tension spring is hooked on the first slot.

[0016] Furthermore, an upper adjustable nut is threadedly connected to the end of the top rotating shaft of the upper arm, and an upper friction plate is wound around the top rotating shaft of the upper arm; the upper adjustable nut is suitable for driving the upper friction plate or the top supporting frame of the upper arm to move so as to adjust the friction resistance of the top supporting frame of the upper arm subjected to the upper friction plate, so as to compensate for the torque change after the upper supporting arm rotates a certain angle and keep the upper supporting arm in a hovering state.

[0017] Furthermore, the opposite ends of the lower arm top support frame are respectively hinged between the support arm connecting member and the base through respective lower arm top rotating shafts; the opposite ends of the lower arm bottom support frame are respectively hinged between the support arm connecting member and the base through respective lower arm bottom rotating shafts.

[0018] Furthermore, one end of the second tension spring is hooked on the top rotating shaft of the lower arm where the top support frame of the lower arm is hinged to the base, and the other end of the second tension spring is hooked on one end of the bottom support frame of the lower arm close to the support arm connecting piece; one end of the third tension spring is hooked on the top rotating shaft of the lower arm where the bottom support frame of the lower arm is hinged to the base, and the other end of the third tension spring is hooked on one end of the top support frame of the lower arm close to the support arm connecting piece.

[0019] Furthermore, a second slot is provided on the side of the lower arm bottom support frame facing the lower arm top support frame, and the other end of the second tension spring is hooked on the second slot; a third slot is provided on the side of the lower arm top support frame facing the lower arm bottom support frame, and the other end of the third tension spring is hooked on the third slot.

[0020] Furthermore, a lower adjustable nut is threadedly connected to the end of the top rotating shaft of the lower arm, and a lower friction plate is arranged around the top rotating shaft of the lower arm and located between the lower adjustable nut and the top supporting frame of the lower arm; the lower adjustable nut is suitable for driving the lower friction plate to move to adjust the friction resistance of the top supporting frame of the lower arm exerted by the lower friction plate, so as to compensate for the torque change after the lower supporting arm rotates a certain angle and keep the lower supporting arm in a hovering state.

[0021] Furthermore, the first tension spring, the second tension spring and the third tension spring are all in an elastically stretched state, and the first tension spring, the second tension spring and the third tension spring are all double-headed hook tension springs with hooks at both ends.

[0022] A medical trolley, comprising:

[0023] Vehicle body;

[0024] The folding arm as described above, wherein the base of the folding arm is mounted on the vehicle body;

[0025] A host computer, arranged on the vehicle body;

[0026] A display assembly, mounted on the display connector of the tension spring support arm and electrically connected to the host; and

[0027] A control keyboard is placed on the vehicle body and is electrically connected to the host.

[0028] The technical solution of the present invention has the following advantages:

[0029] 1. The folding arm provided by the present invention can realize functions such as multi-angle adjustment and up and down hovering. Tension springs are used in the upper support arm and the lower support arm to directly replace the traditional compression spring assembly with numerous parts, which simplifies the internal structure of the upper support arm and the lower support arm, reduces the number of parts, and greatly reduces the production and assembly costs of parts.

[0030] 2. The folding arm provided by the present invention can maintain a hovering state at any position within a range of ±45° relative to the horizontal plane with the support arm connector as the rotation center in the vertical plane, and the lower support arm can maintain a hovering state at any position within a range of ±45° relative to the plumb plane with the base as the rotation center in the vertical plane. In this way, when the lower support arm tilts forward 45° and the upper support arm swings upward 45°, the upper support arm and the lower support arm are in a straight line, so that the folding arm can be opened to the maximum extent; when the lower support arm tilts backward 45° and the upper support arm swings downward 45°, the upper support arm and the lower support arm can be folded and merged together, so that the folding arm can be contracted to the minimum. The upper support arm and the lower support arm of this folding arm can both rotate, and its range of motion is wider than that of the existing support arm, so that the display assembly can be lifted and floated within a larger angle range; and the folding arm occupies less space when folded and stored, which is convenient for transportation.

[0031] 3. The folding arm provided by the present invention has a first slot on the side of the upper arm bottom support frame facing the arm top support frame, and the first tension spring is directly hooked on the first slot, which has the advantages of simple structure and easy tension spring assembly.

[0032] 4. The folding arm provided by the present invention is provided with an upper adjustable nut and an upper friction plate on the top rotating shaft of the upper arm. When the angle of the upper support arm changes, the corresponding parallelogram mechanism is deformed at the same time, so that the stretching length of the first tension spring changes accordingly. At this time, the pulling force of the first tension spring on the bottom support frame of the upper arm may not be equal to the gravity generated by parts such as the display assembly and the display connector. At this time, by adjusting the tightness of the upper adjustable nut of the top rotating shaft of the upper arm, a certain friction force is generated between the top support frame of the upper arm and the upper friction plate. The friction force compensates for the above-mentioned unequal forces, so that the display assembly and the upper support arm can remain in a hovering state at an arbitrary position.

[0033] 5. The folding arm provided by the present invention has a second slot on the inner side of the bottom support frame of the lower arm, and the second tension spring is directly hooked on the second slot; a third slot is on the inner side of the top support frame of the lower arm, and the third tension spring is directly hooked on the third slot; such a configuration has the advantages of simple structure and easy assembly of the tension spring.

[0034] 6. The folding arm provided by the present invention has a lower adjustable nut and a lower friction plate on the top rotating shaft of the lower arm. When the angle of the lower support arm changes, the corresponding parallelogram mechanism is deformed at the same time, so that the stretching lengths of the second tension spring and the third tension spring change accordingly. At this time, the tension of the second tension spring and the third tension spring on the bottom support frame of the lower arm and the top support frame of the lower arm may not be equal to the gravity generated by parts such as the display assembly, the display connector, the upper support arm and the lower support arm. At this time, by adjusting the tightness of the lower adjustable nut of the top rotating shaft of the lower arm, a certain friction force is generated between the top support frame of the lower arm and the lower friction plate. The friction force compensates for the above-mentioned unequal forces, so that the display assembly, the upper support arm and the lower support arm can remain in a hovering state at an arbitrary position.

[0035] 7. The folding arm provided by the present invention, the first tension spring, the second tension spring and the third tension spring are all double-headed hook tension springs with hooks at both ends, which have the advantages of simple structure and easy assembly.

[0036] 8. The medical trolley provided by the present invention adopts the above-mentioned folding arm, which has the advantages of simple structure, easy assembly and low production cost. The display assembly can be raised and lowered and floated with the folding arm within a larger angle range, and the range of movement is wider. In addition, when the folding arm is folded and stored, the medical trolley occupies less space, which is convenient for transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a structural schematic diagram of a zigzag arm in the prior art;

[0039] Figure 2 It is a structural schematic diagram of a folding arm in the prior art;

[0040] Figure 3 It is a schematic diagram of the structure of the compression spring assembly in the upper and lower support arms of the folding arm in the prior art;

[0041] Figure 4It is a schematic diagram of the structure when a display assembly is connected to the folding arm in an embodiment of the present invention;

[0042] Figure 5 It is a structural schematic diagram of a folding arm in an embodiment of the present invention;

[0043] Figure 6 It is a schematic diagram of the hovering state of the folding arm in the embodiment of the present invention when the lower support arm is tilted forward 45 degrees and the upper support arm is swung downward 45 degrees;

[0044] Figure 7 It is a schematic diagram of the hovering state of the folding arm in the embodiment of the present invention when the lower support arm is in an upright state and the upper support arm is swung downward by 45 degrees;

[0045] Figure 8 It is a schematic diagram of the hovering state of the folding arm in the embodiment of the present invention when the lower support arm is tilted backward by 45 degrees and the upper support arm is swung downward by 45 degrees;

[0046] Fig. 9 It is a schematic diagram of the folding arm in the folded and retracted state and the forward extended state according to the embodiment of the present invention;

[0047] Fig.10 Schematic diagram of the structure of the medical trolley in an embodiment of the present invention.

[0048] Explanation of the reference numerals: 100, folding arm; 110, upper supporting arm; 111, upper arm top supporting frame; 112, upper arm bottom supporting frame; 113, first tension spring; 114, upper adjustable nut; 115, upper friction plate; 120, lower supporting arm; 121, lower arm top supporting frame; 122, lower arm bottom supporting frame; 123, second tension spring; 124, third tension spring; 125, lower adjustable nut; 126, lower friction plate; 130, support arm connector; 140, display connector; 150, base; 300, vehicle body; 400, display assembly; 500, control keyboard. DETAILED DESCRIPTION

[0049] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0053] The present invention provides a folding arm, which is mainly used to support a display assembly, especially a display of a cart-type ultrasound device, but is not limited here.

[0054] like Figure 4 A folding arm 100 shown in -9 includes an upper support arm 110 and a lower support arm 120, one end of the upper support arm 110 is connected to a display connector 140, and the display assembly 400 is installed on the display connector 140, the other end of the upper support arm 110 is connected to one end of the lower support arm 120 through a support arm connector 130, and the other end of the lower support arm 120 is connected to a base 150, and the base 150 is fixed on the trolley.

[0055] Specifically, the upper support arm 110 includes an upper arm top support frame 111, an upper arm bottom support frame 112, a first tension spring 113, a pair of upper arm top rotating shafts and a pair of upper arm bottom rotating shafts. The opposite ends of the upper arm top support frame 111 are respectively hinged between the display connecting member 140 and the support arm connecting member 130 through their respective upper arm top rotating shafts; the opposite ends of the upper arm bottom support frame 112 are respectively hinged between the display connecting member 140 and the support arm connecting member 130 through their respective upper arm bottom rotating shafts. The upper arm top support frame 111, the upper arm bottom support frame 112, the display connecting member 140 and the support arm connecting member 130 constitute a first parallelogram mechanism with four fulcrums that can be deformed; the pair of upper arm top rotating shafts and the pair of upper arm bottom rotating shafts are respectively the four fulcrums of the first parallelogram mechanism. One end of the first tension spring 113 is hooked on the top rotating shaft of the upper arm where the upper arm top support frame 111 and the support arm connecting piece 130 are hinged, and the other end of the first tension spring 113 is hooked on one end of the upper arm bottom support frame 112 close to the display connecting piece 140. The first tension spring 113 provides tension to the upper arm bottom support frame 112 to keep the first parallelogram mechanism fixed in shape and to keep the upper support arm 110, the display connecting piece 140 and the display assembly 400 in a suspended state.

[0056] Specifically, the lower support arm 120 includes a lower arm top support frame 121, a lower arm bottom support frame 122, a second tension spring 123, a third tension spring 124, a pair of lower arm top rotating shafts and a pair of lower arm bottom rotating shafts. The opposite ends of the lower arm top support frame 121 are respectively hinged between the support arm connecting member 130 and the base 150 through their respective lower arm top rotating shafts; the opposite ends of the lower arm bottom support frame 122 are respectively hinged between the support arm connecting member 130 and the base 150 through their respective lower arm bottom rotating shafts. The lower arm top support frame 121, the lower arm bottom support frame 122, the support arm connecting member 130 and the base 150 constitute a second parallelogram mechanism with four fulcrums that can be deformed; the pair of lower arm top rotating shafts and the pair of lower arm bottom rotating shafts are respectively the four fulcrums of the second parallelogram mechanism. One end of the second tension spring 123 is hooked on the lower arm top shaft where the lower arm top support frame 121 is hinged with the base 150, and the other end of the second tension spring 123 is hooked on one end of the lower arm bottom support frame 122 close to the support arm connecting piece 130; one end of the third tension spring 124 is hooked on the lower arm top shaft where the lower arm bottom support frame 122 is hinged with the base 150, and the other end of the third tension spring 124 is hooked on one end of the lower arm top support frame 121 close to the support arm connecting piece 130; the second tension spring 123 and the third tension spring 124 are arranged crosswise. The second tension spring 123 and the third tension spring 124 provide tension to the lower arm top support frame 121 and the lower arm bottom support frame 122 to keep the second parallelogram mechanism fixed in shape, and keep the lower support arm 120, the support arm connecting piece 130, the upper support arm 110 and the display assembly 400 in a suspended state.

[0057] This folding arm 100, while being able to realize functions such as multi-angle adjustment and up and down hovering, uses tension springs in the upper support arm 110 and the lower support arm 120 to directly replace the traditional compression spring assembly with numerous parts, thereby simplifying the internal structure of the upper support arm 110 and the lower support arm 120, reducing the number of parts, and greatly reducing the cost of parts production and assembly.

[0058] Wherein, the upper support arm 110, under the tension of the first tension spring 113, maintains a suspended state at any position within the range of ±45° relative to the horizontal plane with the support arm connector 130 as the rotation center in the vertical plane. The lower support arm 120, under the tension of the second tension spring 123 and the third tension spring 124, maintains a suspended state at any position within the range of ±45° relative to the plumb plane with the base 150 as the rotation center in the vertical plane. In this way, when the lower support arm 120 tilts forward 45° and the upper support arm 110 swings upward 45°, the upper support arm 110 and the lower support arm 120 form a straight line, so that the folding arm is opened to the maximum extent; when the lower support arm 120 tilts back 45° and the upper support arm 110 swings downward 45°, the upper support arm 110 and the lower support arm 120 can be folded and merged together, so that the folding arm can be contracted to the minimum. The upper support arm 110 and the lower support arm 120 of the folding arm can both rotate, and the range of motion is wider than that of the existing support arms, so that the display assembly 400 can be raised and lowered within a larger angle range; and the folding arm occupies less space when folded and stored, which is convenient for transportation.

[0059] In some embodiments, the upper arm bottom support frame 112 is provided with a first slot on the side facing the upper arm top support frame 111, and the other end of the first tension spring 113 is hooked on the first slot. The distance from the first slot to the upper arm top rotation axis on the support arm connector 130 is greater than the length of the first tension spring 113, and the first tension spring 113 is always in an elastic tension state, so that the first tension spring 113 generates a pulling force on the upper arm bottom support frame 112, and the pulling force is just balanced with the gravity generated by the display assembly 400 and the display connector 140, so that the display assembly 400 and the upper support arm 110 can be suspended. The lower arm bottom support frame 122 is provided with a second slot on the side facing the lower arm top support frame 121, and the other end of the second tension spring 123 is hooked on the second slot; the lower arm top support frame 121 is provided with a third slot on the side facing the lower arm bottom support frame 122, and the other end of the third tension spring 124 is hooked on the third slot. The distance from the second card slot to the top rotation axis of the lower arm on the base 150 is greater than the length of the second tension spring 123, and the second tension spring 123 is always in an elastic stretching state, so that the second tension spring 123 generates a pulling force on the bottom support frame 122 of the lower arm. The distance from the third card slot to the bottom rotation axis of the lower arm on the base 150 is greater than the length of the third tension spring 124, and the third tension spring 124 is always in an elastic stretching state, so that the third tension spring 124 generates a pulling force on the top support frame 121 of the lower arm. The pulling force of the second tension spring 123 and the pulling force of the third tension spring 124 are balanced with the gravity generated by the display assembly 400, the upper support arm 110, and the support arm connector 130, so that the display assembly 400 can be freely suspended when the folding arm is tilted forward and backward.

[0060] In some embodiments, the first tension spring 113, the second tension spring 123 and the third tension spring 124 are double-headed hook tension springs with hooks at both ends. Such a configuration has the advantages of simple structure and easy assembly of the tension springs.

[0061] In some embodiments, the two ends of the upper arm top shaft have external threads, and the upper adjustable nut 114 is threadedly connected to the external threads of the upper arm top shaft, and an upper friction plate 115 is wound around the upper arm top shaft and located between the upper adjustable nut 114 and the upper arm top support frame 111; the upper adjustable nut 114 is used to drive the upper friction plate 115 to move to adjust the tightness between the upper arm top support frame 111 and the upper friction plate 115, thereby adjusting the friction resistance of the upper arm top support frame 111 to the upper friction plate 115, so as to compensate for the torque change after the upper support arm 110 rotates a certain angle and allows the upper support arm 110 to maintain a hovering state. Fixed nuts are fixed at both ends of the upper arm bottom shaft. When the angle of the upper support arm 110 changes, the corresponding parallelogram mechanism is deformed at the same time, so that the stretching length of the first tension spring 113 changes accordingly. At this time, the tension of the first tension spring 113 on the bottom support frame 112 of the upper arm may not be equal to the gravity generated by parts such as the display assembly 400 and the display connector 140. At this time, by adjusting the tightness of the upper adjustable nut 114 of the top shaft of the upper arm, a certain friction force is generated between the top support frame 111 of the upper arm and the upper friction plate 115. The friction force compensates for the above-mentioned unequal forces, so that the display assembly 400 and the upper support arm 110 can remain in a hovering state at an arbitrary position. In an alternative embodiment, the upper friction plate 115 can also be located between the upper arm top support frame 111 and the support arm connector 130 or the display connector 140, and the upper adjustable nut 114 drives the upper arm top support frame 111 to approach the upper friction plate 115 to adjust the magnitude of the friction force; or the upper arm top rotating shafts on both sides of the upper arm top support frame 111 are both provided with upper friction plates 115, and when the upper adjustable nut 114 moves, the magnitude of the friction force exerted on the upper arm top support frame 111 by the two upper friction plates 115 changes.

[0062] In some embodiments, both ends of the lower arm top rotating shaft and the lower arm bottom rotating shaft have external threads, and lower adjustable nuts 125 are threadedly connected to the external threads of the lower arm top rotating shaft and the lower arm bottom rotating shaft, and a lower friction plate 126 located between the lower adjustable nut 125 and the lower arm top support frame 121 is wound around the lower arm top rotating shaft; and a lower friction plate 126 located between the lower adjustable nut 125 and the lower arm bottom support frame 122 is wound around the lower arm bottom rotating shaft. The lower adjustable nut 125 is suitable for driving the corresponding lower friction plate 126 to move so as to adjust the friction resistance of the lower arm top support frame 121 or the lower arm bottom support frame 122, so as to compensate for the torque change caused by the lower support arm 120 rotating a certain angle and keep the lower support arm 120 in a hovering state. When the angle of the lower support arm 120 changes, the corresponding parallelogram mechanism is deformed at the same time, so that the stretching length of the second tension spring 123 and the third tension spring 124 changes accordingly. At this time, the tension of the second tension spring 123 and the third tension spring 124 on the bottom support frame 122 of the lower arm and the top support frame 121 of the lower arm may not be equal to the gravity generated by the display assembly 400, the display connector 140, the upper support arm 110 and the lower support arm 120. At this time, by adjusting the tightness of the lower adjustable nut 125 of the top rotating shaft of the lower arm, a certain friction force is generated between the top support frame 121 of the lower arm and the lower friction plate 126. The friction force compensates for the above-mentioned unequal forces, so that the display assembly 400, the upper support arm 110 and the lower support arm 120 can remain in a hovering state at an arbitrary position. In an alternative embodiment, the lower friction plate 126 can also be located between the lower arm top support frame 121 and the support arm connecting member 130 or the base 150, and the lower adjustable nut 125 drives the lower arm top support frame 121 to approach the lower friction plate 126 to adjust the magnitude of the friction force; or the lower arm top rotating shafts on both sides of the lower arm top support frame 121 are both provided with lower friction plates 126, and when the lower adjustable nut 125 moves, the magnitude of the friction force exerted on the lower arm top support frame 121 by the two lower friction plates 126 changes.

[0063] The embodiment of the present invention further provides a medical trolley, which includes the above-mentioned tension spring type support arm. The specific structure of the support arm refers to the above-mentioned embodiment. Since the medical trolley proposed by the present invention includes all schemes of all embodiments of the above-mentioned tension spring type support arm, it has at least the same technical effect as the above-mentioned tension spring type support arm, which will not be described one by one here. It should be noted that the medical trolley can be an ultrasound device or other device with a display assembly 400, which is not limited here.

[0064] Reference Fig.10In some embodiments, the medical trolley includes a tension spring support arm, a vehicle body 300, a host, a display assembly 400, and a control keyboard 500. The base 150 of the tension spring support arm is fixed on the vehicle body 300; the host is arranged on the vehicle body 300; the display assembly 400 is installed on the display connector 140 of the tension spring support arm and is electrically connected to the host; the control keyboard 500 is placed on the vehicle body 300 and is electrically connected to the host. In this embodiment, a walking structure such as a universal wheel can be arranged at the bottom of the vehicle body 300 to facilitate the pushing of the entire device.

[0065] In the prior art, especially the support structure of the zigzag arm structure, since the lower support arm 120 cannot rotate, only the upper support arm 110 can rotate. During the rotation of the upper support arm 110, it will interfere with the display screen connected to the lower control keyboard 500 and cannot be completely folded. However, the upper support arm 110 and the lower support arm 120 of the present invention can rotate freely within a certain range. When the lower support arm 120 tilts back to the maximum angle, the upper support arm 110 can be folded against the lower support arm 120, which can minimize the entire installation volume, thereby saving packaging space and reducing transportation costs.

[0066] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A folding arm, characterized in that: The device comprises an upper support arm (110) and a lower support arm (120), wherein one end of the upper support arm (110) is connected to a display connector (140), the other end of the upper support arm (110) is connected to one end of the lower support arm (120) via an arm connector (130), and the other end of the lower support arm (120) is connected to a base (150); The upper support arm (110) includes an upper arm top support frame (111), an upper arm bottom support frame (112), and a first tension spring (113) elastically connected between the upper arm top support frame (111) and the upper arm bottom support frame (112); the upper arm top support frame (111), the upper arm bottom support frame (112), the display connector (140) and the support arm connector (130) constitute a deformable first polygonal mechanism, and the first tension spring (113) provides a pulling force for the upper arm bottom support frame (112) so that the first polygonal mechanism maintains a fixed shape and enables the upper support arm (110) to maintain a suspended state.

2. The folding arm according to claim 1, characterized in that: The lower support arm (120) includes a lower arm top support frame (121), a lower arm bottom support frame (122), and a second tension spring (123) and a third tension spring (124) elastically connected between the lower arm top support frame (121) and the lower arm bottom support frame (122); the lower arm top support frame (121), the lower arm bottom support frame (122), the support arm connecting member (130) and the base (150) constitute a deformable second polygonal mechanism; the second tension spring (123) and the third tension spring (124) are cross-arranged, and the second tension spring (123) and the third tension spring (124) provide tension to the lower arm top support frame (121) and the lower arm bottom support frame (122) so that the second polygonal mechanism maintains a fixed shape and the lower support arm (120) is kept in a suspended state.

3. The folding arm according to claim 1, characterized in that: Under the tension of the first tension spring (113), the upper support arm (110) maintains a hovering state at any position within a range of ±45° relative to a horizontal plane in a vertical plane with the support arm connector (130) as the rotation center.

4. The folding arm according to claim 2, characterized in that: Under the tension of the second tension spring (123) and the third tension spring (124), the lower support arm (120) maintains a hovering state at any position within a range of ±45° relative to the plumb plane with the base (150) as the rotation center in a vertical plane.

5. The folding arm according to claim 1, characterized in that: The opposite ends of the upper arm top support frame (111) are respectively hinged between the display connecting member (140) and the support arm connecting member (130) through their own upper arm top rotating shafts; the opposite ends of the upper arm bottom support frame (112) are respectively hinged between the display connecting member (140) and the support arm connecting member (130) through their own upper arm bottom rotating shafts.

6. The folding arm according to claim 5, characterized in that: One end of the first tension spring (113) is hooked on the upper arm top rotating shaft hinged between the upper arm top support frame (111) and the support arm connecting piece (130), and the other end of the first tension spring (113) is hooked on one end of the upper arm bottom support frame (112) close to the display connecting piece (140).

7. The folding arm according to claim 6, characterized in that: A first slot is provided on one side of the upper arm bottom support frame (112) facing the upper arm top support frame (111), and the other end of the first tension spring (113) is hooked on the first slot.

8. The folding arm according to claim 5, characterized in that: An upper adjustable nut (114) is threadedly connected to the end of the upper arm top rotating shaft, and an upper friction plate (115) located on one side of the upper arm top supporting frame (111) is arranged around the upper arm top rotating shaft; the upper adjustable nut (114) is suitable for driving the upper friction plate (115) or the upper arm top supporting frame (111) to move so as to adjust the friction resistance of the upper arm top supporting frame (111) exerted by the upper friction plate (115).

9. The folding arm according to claim 2, characterized in that: The opposite ends of the lower arm top support frame (121) are respectively hinged between the support arm connecting member (130) and the base (150) through respective lower arm top rotating shafts; the opposite ends of the lower arm bottom support frame (122) are respectively hinged between the support arm connecting member (130) and the base (150) through respective lower arm bottom rotating shafts.

10. The folding arm according to claim 9, characterized in that One end of the second tension spring (123) is hooked on the top rotating shaft of the lower arm where the lower arm top support frame (121) is hinged to the base (150), and the other end of the second tension spring (123) is hooked on one end of the lower arm bottom support frame (122) close to the support arm connecting piece (130); one end of the third tension spring (124) is hooked on the top rotating shaft of the lower arm where the lower arm bottom support frame (122) is hinged to the base (150), and the other end of the third tension spring (124) is hooked on one end of the lower arm top support frame (121) close to the support arm connecting piece (130).

11. The folding arm according to claim 10, characterized in that: A second slot is provided on the side of the lower arm bottom support frame (122) facing the lower arm top support frame (121), and the other end of the second tension spring (123) is hooked on the second slot; a third slot is provided on the side of the lower arm top support frame (121) facing the lower arm bottom support frame (122), and the other end of the third tension spring (124) is hooked on the third slot.

12. The folding arm according to claim 8, characterized in that The end of the lower arm top rotating shaft is threadedly connected with a lower adjustable nut (125), and the lower arm top rotating shaft is wound around a lower friction plate (126) located on one side of the lower arm top supporting frame (121); the lower adjustable nut (125) is suitable for driving the lower friction plate (126) or the lower arm top supporting frame (121) to move so as to adjust the friction resistance of the lower arm top supporting frame (121) exerted by the lower friction plate (126).

13. The folding arm according to claim 2, characterized in that: The first tension spring (113), the second tension spring (123) and the third tension spring (124) are all in an elastic tension state, and the first tension spring (113), the second tension spring (123) and the third tension spring (124) are all double-headed hook tension springs with hooks at both ends.

14. A medical trolley, characterized in that: include: Car body (300); The folding arm according to any one of claims 2 to 13, wherein the base (150) of the folding arm is mounted on the vehicle body (300); A main machine, arranged on the vehicle body (300); A display assembly (400) is mounted on the display connector (140) of the tension spring support arm and is electrically connected to the host; as well as A control keyboard (500) is placed on the vehicle body (300) and is electrically connected to the host.

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