A sequential telescopic mechanism

Abstract

The present invention relates to the technical field of medical equipment, and discloses a sequential telescopic mechanism, including a first moving part, a second moving part, a pull pin, a shift pin and a self-locking plate; the second moving part has a first sliding hole along its length direction, the first moving part is slidably arranged along the length direction of the second moving part, one end of the pull pin is connected to the first moving part, the other end of the pull pin can be slidably arranged in the first sliding hole, the self-locking plate has a second sliding hole along its length direction, one end of the self-locking plate is rotatably mounted on the second moving part, one end of the shift pin is fixed, and the other end of the shift pin can be slidably arranged in the second sliding hole, so that the other end of the self-locking plate cooperates with the pull pin. Its beneficial effect is that the two moving parts are sequentially telescoped, which improves the ability of the moving parts to resist deflection deformation, thereby improving the service life of the medical equipment.

Description

Technical Field

[0001] The invention relates to the technical field of medical equipment, and in particular to a sequential telescopic mechanism. Background Art

[0002] In order to adapt to patients of different heights or to different use sites, medical equipment needs to have a telescopic function. If the telescopic mechanism has a large stroke, multi-section telescopic tubes are often used to reduce the deflection and deformation of the telescopic shaft. However, if the multi-section telescopic tubes are not extended and retracted in sequence during the telescopic process, the ability of the telescopic shaft to resist deflection and deformation will be greatly reduced, affecting the service life of the medical equipment, and even endangering the safety of the patient in serious cases. At the same time, the random extension and retraction of the multi-section telescopic tubes will also affect the user experience.

[0003] At present, there is no telescopic motion mechanism that can telescope in sequence in the field of medical equipment. In other fields, each section of the telescopic tube is generally controlled separately by a travel switch and a hydraulic cylinder, but the structure is complex and the cost is high, which also increases the unreliability of the product. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the above prior art and provide a sequential telescopic mechanism with simple and reasonable structure and low cost.

[0005] The objective of the present invention is achieved through the following technical scheme: a sequential telescopic mechanism, comprising a first moving part, a second moving part, a pull pin, a shift pin and a self-locking plate; the second moving part is provided with a first sliding hole along its length direction, the first moving part is slidably arranged along the length direction of the second moving part, one end of the pull pin is connected to the first moving part, the other end of the pull pin is slidably arranged in the first sliding hole, the self-locking plate is provided with a second sliding hole along its length direction, one end of the self-locking plate is rotatably installed on the second moving part, one end of the shift pin is fixed, the other end of the shift pin is slidably arranged in the second sliding hole, so that the other end of the self-locking plate cooperates with the pull pin, and when the second moving part is in the first state, the shift pin is located at the top end of the second sliding hole.

[0006] Furthermore, the self-locking plate includes a first protrusion, a second protrusion and a sliding portion; the sliding portion has a second sliding hole along its length direction, the first protrusion is located at one end of the sliding portion, the first protrusion is rotatably installed on the second moving part, the second protrusion is located at the other end of the sliding portion, and the second protrusion cooperates with the pull pin.

[0007] Furthermore, the second sliding hole includes a first channel and a second channel that are connected, the first channel is arranged along the length direction of the self-locking plate, the second channel is located at the top of the first channel and is inclined toward the first sliding hole, and when the second moving part is in the first state, the shift pin is located in the second channel.

[0008] Furthermore, the angle between the first channel and the second channel is 110-160°.

[0009] Furthermore, the lengths of the first sliding hole and the second sliding hole are both shorter than the length of the second moving member, the first moving member and the second moving member are both sleeve structures, and the top end of the first moving member passes through the top end of the second moving member and extends upward.

[0010] Furthermore, it also includes a fixing member, one end of the shift pin is fixed to the fixing member, and the second moving member is slidably arranged along the length direction of the fixing member.

[0011] Furthermore, it also includes a driving member, which is located in the fixing member, and the output end of the driving member is connected to the first moving member.

[0012] Furthermore, it also includes a base, and the fixing member is installed on the base.

[0013] Furthermore, the bottom ends of the first moving member, the second moving member and the fixed member are all provided with openings that match the driving member.

[0014] Furthermore, the driving member is a push rod motor, and a push rod of the push rod motor is connected to the first moving member.

[0015] The present invention utilizes the self-locking principle, and the swing of the self-locking plate causes the two moving parts to move synchronously or relatively to form sequential telescopic movement. Specifically, the first moving part extends upward along the length direction of the second moving part, the pull pin moves with the first moving part, and the other end of the pull pin moves in the first sliding hole. When the pull pin moves to the top of the first sliding hole, the second moving part moves upward with the first moving part. At this time, the shift pin moves downward relative to the second moving part, thereby shifting the self-locking plate to swing toward the first slideway to lock the pull pin, so that the second moving part and the first moving part form a whole and move upward synchronously. When the first moving part begins to retract, the second moving part moves downward synchronously with the first moving part. At this time, the shift pin moves upward relative to the second moving part. When the shift pin moves to the top of the second sliding hole, the self-locking plate is shifted to move in a direction away from the first slideway, thereby releasing the pull pin, separating the first moving part from the second moving part, returning the second moving part to its original position, and the first moving part continues to retract downward to its original position.

[0016] The present invention has the following advantages over the prior art:

[0017] 1. This sequential telescopic mechanism is provided with a self-locking plate, a displacement pin, a pull pin, a first sliding hole and a second sliding hole. When the first moving part is extended, the self-locking plate swings and self-locks, so that the first moving part and the second moving part form a whole and continue to move; when the second moving part is retracted to the right position, the self-locking plate swings and disengages, and the first moving part continues to retract to the right position. The overall structure is simple, the design is reasonable, and the cost is low. The sequential telescopic mechanism is realized through the self-locking principle, and the ability of the moving parts to resist deflection deformation is improved. The telescopic height of the upper and lower limbs can be accurately adjusted, and the service life of the medical equipment can be increased.

[0018] 2. The self-locking plate in this sequential telescopic mechanism has a compact structure and will not affect the relative movement between the moving parts and the cross-sectional dimensions of the moving parts; the moving parts in this sequential telescopic mechanism are all sleeve structures with high stability; this sequential telescopic mechanism uses a push rod motor as a driving part, with stable travel and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 An exploded view of a sequential telescopic mechanism according to the present invention is shown;

[0021] Figure 2 Shows Figure 1 A schematic diagram of the structure in which the second moving part is connected to the self-locking plate;

[0022] Figure 3 A schematic structural diagram of a self-locking plate according to the present invention is shown;

[0023] Figure 4 It shows a schematic structural diagram of the second moving member in the first state according to the present invention;

[0024] Figure 5 It shows a schematic structural diagram of the first moving member extending upward according to the present invention;

[0025] In the figure, 1 is the first moving part; 2 is the second moving part; 3 is the pull pin; 4 is the shift pin; 5 is the self-locking plate; 6 is the first sliding hole; 7 is the second sliding hole; 8 is the first protrusion; 9 is the second protrusion; 10 is the sliding part; 11 is the first channel; 12 is the second channel; 13 is the fixing part; 14 is the base; 15 is the opening; 16 is the push rod motor. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] like Figure 1-Figure 3The sequential telescopic mechanism shown in the figure comprises a first moving part 1, a second moving part 2, a pull pin 3, a shift pin 4 and a self-locking plate 5; the second moving part 2 has a first sliding hole 6 along its length direction, the first moving part 1 is slidably arranged along the length direction of the second moving part 2, one end of the pull pin 3 is connected to the first moving part 1, and the other end of the pull pin 3 is slidably arranged in the first sliding hole 6, the self-locking plate 5 has a second sliding hole 7 along its length direction, one end of the self-locking plate 5 is rotatably mounted on the second moving part 2, and the self-locking plate is located on one side of the first sliding hole 6, one end of the shift pin 4 is fixed, and the other end of the shift pin 4 is slidably arranged in the second sliding hole 7, so that the other end of the self-locking plate 5 cooperates with the pull pin 3, and when the second moving part 2 is in the first state, the shift pin 4 is located at the top end of the second sliding hole 7. The first state is a state in which the second moving part 2 does not perform telescopic movement. The first moving part 1 and the second moving part 2 are plate-like structures or sleeve structures. When the second moving member 2 is a plate-like structure, the first moving member 1 is also a plate-like structure to ensure stability, a first sliding hole is opened on the second moving member 2, and the first moving member 1 is slidably arranged on one side of the second moving member, and a pull pin 3, a shift pin 4 and a self-locking plate 5 are correspondingly arranged. When the second moving member 2 is a sleeve-like structure, the first moving member 1 is sleeve-like or plate-like, and first sliding holes 6 are opened on both sides of the second moving member 2, and pull pins 3 are correspondingly arranged on both sides of the first moving member 1, and shift pins 4 and self-locking plates 5 are correspondingly arranged on both sides of the second moving member 2.

[0028] like Figure 3 As shown, the self-locking plate 5 includes a first protrusion 8, a second protrusion 9 and a sliding portion 10; the sliding portion 10 is provided with a second sliding hole 7 along its length direction, the first protrusion 8 is located at one end of the sliding portion 10, the first protrusion 8 is rotatably mounted on the second moving part 2, the second protrusion 9 is located at the other end of the sliding portion 10, and the second protrusion 9 cooperates with the pull pin 3. The first protrusion 8 is connected to the second moving part through a positioning pin, and the first protrusion 8 can rotate around the positioning pin as an axis. During specific installation, the self-locking plate 5 is installed along the length direction of the first sliding hole 6 and is located on one side of the first sliding hole 6, so that the second protrusion 9 can lock or release the pull pin 3 under the action of the shift pin. The second protrusion 9 has a smooth transition that cooperates with the pull pin 3.

[0029] The second sliding hole 7 includes a first hole 11 and a second hole 12 connected to each other. The first hole 11 is arranged along the length direction of the self-locking plate 5. The second hole 12 is located at the top of the first hole 11 and is inclined toward the first sliding hole 6. When the second moving part 2 is not in telescopic movement, the shift pin 4 is located in the second hole 12. Figure 4 and Figure 5As shown, when the first moving part 1 begins to extend upward, the pull pin 3 moves toward the top of the first sliding hole 6. After the pull pin 3 moves to the top of the first sliding hole 6, it drives the second moving part 2 to move upward. At this time, the shift pin moves downward relative to the second moving part 2, thereby pushing the second protrusion 9 of the self-locking plate 5 close to the top of the first sliding hole 6 to lock the pull pin 3, so that the first moving part 1 and the second moving part 2 become one, and rise and fall synchronously within the length of the second sliding hole 7; the first moving part 1 retracts, and the second moving part 2 moves downward with the first moving part 1, and the shift pin 4 moves upward relative to the second moving part 2. When the shift pin 4 moves to the second channel 12, it pushes the self-locking plate 5 to make it swing away from the first sliding hole 6 to release the pull pin 3, and then the first moving part 1 is separated from the second moving part 2, and the first moving part continues to retract to its original position.

[0030] The angle between the first hole 11 and the second hole 12 is 110-160°, preferably 130-150°. With this arrangement, the shift pin 4 can move the self-locking plate 5 during the reciprocating extension and contraction of the self-locking plate 5 to lock or release the pull pin 3.

[0031] The length of the first sliding hole 6 and the second sliding hole 7 is less than the length of the second moving member 2. When the first moving member 1 and the second moving member 2 are both sleeve structures, the top of the first moving member 1 passes through the top of the second moving member 2 and extends upward. This arrangement can prevent the first moving member 1 from being separated from the second moving member, thereby improving the stability of the sequential telescopic mechanism.

[0032] The second movable member 2 is also provided with a fixing member 13 and a base 14, wherein the fixing member 13 is mounted on the base, and the second movable member 2 is slidably arranged along the length direction of the fixing member 13, and one end of the shift pin 4 is fixed to the fixing member 13, and the other end of the shift pin 4 is slidably arranged in the second sliding hole 7. When the second movable member 2 slides along the length direction of the fixing member 13, the other end of the shift pin 4 slides synchronously in the second sliding hole 7 to lock or release the pull pin 3.

[0033] It also includes a driving member, which is located in the fixing member 13, and the output end of the driving member is connected to the first moving member 1. The driving member is a push rod motor 16, and the push rod of the push rod motor 16 is connected to the first moving member 1. The push rod motor 16 is arranged to push the first moving member to extend and retract back and forth, and the stroke is stable and the cost is low.

[0034] The bottom ends of the first moving member 1, the second moving member 2 and the fixing member 13 are all provided with openings 15 that match the push rod motor. The openings 15 are provided to facilitate wiring and installation of the push rod motor 16.

[0035] The above sliding arrangement can be realized by using a slide rail or a sleeve.

[0036] When used: Figure 1-Figure 5As shown, the first moving member 1, the second moving member 2 and the fixed member 13 are all sleeve structures, wherein the upper ends of the second moving member and the fixed member 13 are open to facilitate telescopic movement. The fixed member 13 is mounted on the base 14, the second moving member 2 is slidably arranged in the fixed member 13, one end of the shift pin 4 is connected to the fixed member 13, and the other end of the shift pin 4 can move in the second sliding hole 7, the first moving member 1 is slidably arranged in the second moving member 2, one end of the pull pin 3 is connected to the first moving member 1, and the other end of the pull pin 3 can move in the first sliding hole 6, and the push rod motor 16 is arranged in the fixed member 13, and the push rod of the push rod motor 16 is connected to the first moving member 1 to drive the first moving member 1 to extend and retract.

[0037] When the first moving part 1 extends upward, the pull pin 3 moves toward the top of the first sliding hole 6. After the pull pin 3 moves to the top of the first sliding hole 6, it drives the second moving part 2 to move upward. The angle between the first channel 11 and the second channel is 135°. At this time, the shift pin moves downward relative to the second moving part 2, thereby pushing the second protrusion 9 of the self-locking plate 5 to move toward the top of the first sliding hole 6 to lock the pull pin 3, so that the first moving part 1 and the second moving part 2 become one, and rise and fall synchronously within the length range of the second sliding hole 7; when the first moving part 1 retracts, the second moving part 2 moves downward with the first moving part 1, and the shift pin 4 moves upward relative to the second moving part 2. When the shift pin 4 moves to the second channel 12, it pushes the self-locking plate 5 to swing it away from the first sliding hole 6 to release the pull pin 3, and then the first moving part 1 is separated from the second moving part 2, and the second moving part 2 just falls back to the base 14, and the first moving part 1 continues to retract to its original position.

[0038] The sequential telescopic mechanism can make multiple sections of telescopic tubes telescopic in sequence, thereby increasing the service life of the medical device. In actual use, the number of sleeve structures can be increased to meet the needs of different travels.

[0039] The above specific implementation modes are preferred embodiments of the present invention and cannot be used to limit the present invention. Any other changes or other equivalent replacement methods that do not deviate from the technical solution of the present invention are included in the protection scope of the present invention.

Claims

1. A sequential telescopic mechanism, characterized in that: The invention comprises a first moving part, a second moving part, a pull pin, a shift pin and a self-locking plate; the second moving part is provided with a first sliding hole along its length direction, the first moving part is slidably arranged along the length direction of the second moving part, one end of the pull pin is connected to the first moving part, the other end of the pull pin is slidably arranged in the first sliding hole, the self-locking plate is provided with a second sliding hole along its length direction, one end of the self-locking plate is rotatably mounted on the second moving part, one end of the shift pin is fixed, the other end of the shift pin is slidably arranged in the second sliding hole, so that the other end of the self-locking plate cooperates with the pull pin, and when the second moving part is in the first state, the shift pin is located at the top end of the second sliding hole; The self-locking plate comprises a first protrusion, a second protrusion and a sliding portion; the sliding portion is provided with a second sliding hole along its length direction, the first protrusion is located at one end of the sliding portion, the first protrusion is rotatably mounted on the second moving member, the second protrusion is located at the other end of the sliding portion, and the second protrusion cooperates with the pull pin; The second sliding hole comprises a first hole and a second hole that are connected, the first hole is arranged along the length direction of the self-locking plate, the second hole is located at the top of the first hole and is inclined toward the first sliding hole, and when the second moving member is in the first state, the shift pin is located in the second hole; The angle between the first channel and the second channel is 110-160°; The first moving member and the second moving member are both sleeve structures, and the top end of the first moving member passes through the top end of the second moving member and extends upward; It also includes a fixing member, one end of the shift pin is fixed to the fixing member, and the second moving member is slidably arranged along the length direction of the fixing member; It also includes a driving member, which is located in the fixing member, and an output end of the driving member is connected to the first moving member.

2. The sequential telescopic mechanism according to claim 1, characterized in that: It also includes a base, and the fixing member is installed on the base.

3. The sequential telescopic mechanism according to claim 1, characterized in that: The bottom ends of the first moving part, the second moving part and the fixed part are all provided with openings matched with the driving part.

4. The sequential telescopic mechanism according to claim 1, characterized in that: The driving member is a push rod motor, and a push rod of the push rod motor is connected to the first moving member.

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