JP5792353B1 - Clamping device - Google Patents

Abstract

[PROBLEMS] To use a clamp device to fix a stand on which an infusion pump or the like is placed on a stand, but if a torque limiter mechanism is provided, the torque limiter stops operating and becomes idle and falls. The danger comes out. An inclined convex portion 65 and a vertical convex portion 71 are provided on the opposing surface of the mounting portion 57 on the rotational operation portion side, and the inclined convex portion is provided on the opposing surface of the mounting portion 77 on the male screw shaft 13 side. In the initial state, the inclined pressure contact surfaces 67 and 85 of the inclined convex portions 65 and 83 are brought into pressure contact with each other, and the torque limiter can be operated. When the pressure contact surface wears out, the vertical pressure contact surfaces 73 and 91 of the vertical convex portions 71 and 89 are pressed against each other, so that the clamping function remains, but the torque limiter does not operate. Therefore, the clamp function can be maintained safely even if it is used for a long time. [Selection] FIG.

Description

  The present invention relates to a clamping device, and more particularly to a clamping device having a torque limiter mechanism.

A medical device, for example, an infusion pump used for infusion, is used in a state where the main body is placed on a stand fixed to a pole of a stand. Therefore, it is necessary to firmly fix the cradle to the pole so that the cradle does not fall.
As shown in Patent Document 1, a clamp device having a pair of clamp parts composed of a fixed side clamp part and a movable side clamp part is attached to the stand, and the movable side clamp part is attached to the fixed side clamp part. It is close to it, and it is fixed by clamping with the pole held by both clamps, but especially for medical use, the consciousness to fix firmly works, or it is fixed by tightening excessively firmly It tends to be.

If this is left unattended, the clamping function will be adversely affected, such as bending of the shaft connected to the movable clamp portion, or crushing of the screw portion formed on the shaft.
Therefore, conventionally, a torque limiter mechanism is interposed between the manual operation part such as a knob and the movable side clamp part to limit the torque transmitted to the movable side clamp part so that the tightening does not become too hard. It is adjusted to.

JP 2006-218172 A

  When a torque limiter mechanism is interposed, the pressure contact surface on the movable clamp portion side and the pressure contact surface on the rotation operation portion side such as a knob frictionally slide to transmit torque on the rotation operation portion side. However, if it continues to be used for a long period of time, the pressure contact surface will be worn away due to wear, so that it will not be able to slide by friction, resulting in insufficient tightening and impaired clamping function. Therefore, there is a risk that the stand will fall. Such a fall is not limited to tightening and fixing work, but may occur after the fixation is completed and left the site, but in medical devices, such a drop can lead to a medical accident involving the life of the patient. It cannot be overlooked at all.

  The present invention has been made paying attention to the above-mentioned conventional problems, and provides a clamping device in which a safety device is provided in a torque limiter mechanism so that the clamping function is maintained safely even if the device is used for a long period of time. That is the purpose.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the invention of claim 1 includes a pair of clamp parts including a fixed side clamp part and a movable side clamp part, a manual rotation operation part, and one end. A clamping device comprising: a rotating shaft that is connected to the movable-side clamp portion and screwed; and a torque limiter mechanism with a safety device interposed between the other end side of the rotating shaft and the rotation operation portion. The torque limiter mechanism with a safety device is provided in a plurality on opposite sides of the rotation operation unit and the rotation shaft, and on the rotation operation unit side, an inclined convex portion with an inclined pressure contact surface facing the rotation direction side, and a vertical The pressure contact surface faces the same direction, and the pressure contact portion is a vertical convex portion located behind the inclined pressure contact surface in the rotation direction, and the inclined pressure contact surface faces the opposite side in the rotation direction on the movable side clamp portion side. Convex and vertical pressure contact surface are in the same direction And a pressure contact portion which is a vertical convex portion located behind the inclined pressure contact surface in the rotation direction, and a pressure contact portion on the rotation operation portion side from an axial direction of the rotation shaft with respect to the pressure contact portion on the movable clamp side. Elastic biasing means for elastically biasing, and in the initial state, when the inclined pressure contact surfaces are in contact with each other, the vertical pressure contact surfaces are set so as not to be separated from each other, and the elastic When the biasing force is received from the biasing means , the inclined pressure contact surfaces are in pressure contact with each other and the clamp function is activated in a state where the torque limiter is operable. The clamping device is characterized in that the clamping function is maintained safely by pressing.

  According to a second aspect of the present invention, in the clamping device according to the first aspect, an attachment portion is provided on each facing side of the rotation operation portion and the rotation shaft, and each of the attachment portions includes a plurality of inclined convex portions and a plurality of inclination projection portions. The clamp device is characterized in that the vertical protrusions are arranged coaxially so as to draw a circle.

  According to a third aspect of the present invention, in the clamping device according to the second aspect, the mounting portion and the convex portion are formed of an integral resin molded product, and the rotational operation portion side is softer than the movable clamp side. It is the clamp apparatus characterized by these.

  According to a fourth aspect of the present invention, in the clamp device according to the third aspect, the elastic biasing means is constituted by a spring piece that spreads in the shape of an umbrella frame, and the spring piece press-contacts the mounting portion on the rotary operation portion side. The clamping device is characterized in that it is biased from the back side irrespective of the relationship.

  According to a fifth aspect of the present invention, in the clamp device according to any one of the second to fourth aspects, the circular row of the inclined convex portions is arranged outside the circular row of the vertical convex portions. Device.

  A sixth aspect of the present invention is the clamping device according to any one of the first to fifth aspects, wherein the medical device is used for attaching to a pole of a stand.

  According to the clamping device of the present invention, a safety device is provided in the torque limiter mechanism, and the clamping function can be maintained safely even if the torque limiting device is used for a long time.

It is a perspective view which shows the use condition of the clamp apparatus of this invention. It is explanatory drawing of the clamp operation | movement of the clamp apparatus of FIG. It is a partial expansion perspective view of the clamp apparatus of FIG. It is a disassembled perspective view of the clamp apparatus of FIG. FIG. 4 is a bottom view of the component shown in FIG. 3. FIG. 4 is a bottom view of the component shown in FIG. 3. FIG. 4 is a plan view of the component shown in FIG. 3. FIG. 4 is a cross-sectional view of FIG. 3. It is a bottom view which shows the fitting state of the two component parts of FIG. FIG. 4 is a state explanatory diagram of a torque limiter mechanism during integral rotation in the clamping operation of FIG. 2. FIG. 11 is a state explanatory view of a torque limiter mechanism during idling, which is different from FIG. 10. It is operation | movement explanatory drawing of the safety device after wear progress corresponding to FIG.

A clamp device 1 according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a table 101 is integrally attached to the clamp device 1. By fixing the clamp device 1 to a pole 105 of a stand 103, the table 101 has a constant height. It has come to be supported. An infusion pump 107 is placed on the table 101.

The clamp device 1 will be described in detail below.
Reference numeral 3 denotes a clamp base. The clamp base 3 is provided with three rectangular side surfaces, and looks like a substantially U shape from above. One of the pair of side surfaces facing each other among the three side surfaces is a fixed-side clamp portion 5, and a concave portion 7 extending in the vertical direction is formed on the facing surface side.
The other is a shaft support 9, and a female screw hole 11 is formed through the shaft support 9.

Reference numeral 13 denotes a male screw shaft (shaft), and a movable side clamp portion 15 is connected to the front end side of the male screw shaft 13 in the axial direction. The movable-side clamp portion 15 includes a pair of concave pieces 17 and 17 arranged at intervals in the vertical direction. The pair of concave pieces 17 and 17 and the concave portion 7 of the above-described fixed-side clamp portion 5 are opposed to each other on the concave surface side, so that the pole 105 can be stably held when close to each other.
A knob 19 is connected to the other axial end of the male screw shaft 13.
The male screw shaft 13 is inserted in a state where the screw portion is screwed into the female screw hole 11 of the shaft support portion 9, and is arranged on the clamp base 3 side so that the movable side clamp portion 15 faces the fixed side clamp portion 5. Has been.
Therefore, as shown in FIG. 2, when tightening, when the knob 19 is turned, the male screw shaft 13 is screwed in the axial direction when the knob 19 is not idle, and the movable side clamp portion 15 is moved relative to the fixed side clamp portion 5. It moves close to it and changes from a state indicated by a virtual line to a state indicated by a solid line.

As shown in FIG. 3, the other axial end of the male screw shaft 13 is inserted into a shaft fixing portion 21 having a through hole. A screw hole is formed in a side portion of the shaft fixing portion 21, and a push screw 23 inserted therethrough is screwed to press the inserted male screw shaft 13. The male screw shaft 13 is fixed to the shaft. It is fixed to the part 21 so as not to come off.
Next, the configuration of the knob 19 will be described in detail.
Reference numeral 25 denotes a case, which is a rotation operation unit.
As shown in FIG. 4, the case 25 has a substantially cylindrical shape with a top, and a plurality of anti-slip recesses 27 are formed on the outer surface of the case 25, and the center of the top is directed inward. A recessed portion 29 is formed, and a support hole 31 is formed in the center of the ceiling. A plurality of communication holes 33 are formed around the recess 29. The parentheses in FIG. 4 show the case 25 from the inner surface. As can be seen in this figure, the concave and convex rows 35 are formed in parallel to the axial direction. On the opening end side, there is no convex row of the concave and convex rows, and a smooth annular inner surface 37 is formed. In addition, a plurality of retaining claws 39 are formed at positions corresponding to the convex rows of the concavo-convex row 35 at the open end.

Reference numeral 41 denotes an interposed member. The intervention member 41 is also formed in a substantially cylindrical shape, but is shorter than the case 25 described above. This side also has a concavo-convex shape in which concave rows and convex rows are alternately arranged, and the convex and concave rows 45 (FIG. 9) on the inner side face the concave and convex rows 43 on the outer side. This row extends parallel to the axial direction. A square support hole 47 is formed at the center of the top, and a plurality of communication holes 49 are formed around it.
Reference numeral 51 denotes a spring member, and the spring member 51 includes a support shaft 53 and a plurality of spring pieces 55 extending from one end of the support shaft 53 in the shape of an umbrella frame.

  Reference numeral 57 denotes a disk-shaped mounting portion, and an uneven row 59 is formed on the outer surface of the mounting portion 57. Further, a circular stepped portion 61 is provided at the center of the mounting portion 57, and when viewed in FIG. 4, the stepped portion 61 is convex on the upper surface side and concave on the lower surface side. Two communication holes 63 are formed near the center of the stepped portion 61. The lower surface side of the mounting portion 57 is an opposing surface for pressure contact, and a plurality of pairs of two types of convex portions 65 and 71 are formed as shown in parentheses in FIG.

One of the convex portions 65 and 71 is an inclined convex portion 65. The inclined convex portion 65 has a shape obtained by obliquely dividing a rectangular parallelepiped into two, and the inclined surface 67 is a pressure contact surface. The inclined pressure contact surface 67 is attached to form a side surface, and an upper top portion thereof is an inclined end portion 69. The plurality of inclined convex portions 65 are arranged on the opposing surface of the attachment portion 57 at a predetermined interval so as to draw a single circle coaxially, and the inclined pressure contact surfaces 67 face the same direction.
The other is a vertical projection 71. The vertical convex portion 71 has a flattened rectangular parallelepiped shape, and one of the plate surfaces is a pressure contact surface 73. The pressure contact surface 73 is attached to form a vertical side surface, and the plate thickness surface is a vertical end portion 75. The plurality of vertical convex portions 71 are also arranged on the opposing surface of the attachment portion 57 so as to draw one circle coaxially, and the vertical pressure contact surface 73 faces the same direction as the inclined pressure contact surface 67.

The circular rows of the inclined convex portions 65 are arranged outside the circular rows of the vertical convex portions 71, and the outer side surfaces of the vertical convex portions 71 are slightly spaced from the inner side surfaces of one inclined convex portion 65. It is opposite with a gap.
The inclined end portion 69 of the inclined convex portion 65 protrudes beyond the vertical end portion 75 of the vertical convex portion 71. Further, the vertical pressure contact surface 73 of the vertical convex portion 71 is located at a subsequent position in the rotational direction indicated by the arrow in FIG. 6 from the inclined pressure contact surface 67 of the inclined convex portion 65.

Reference numeral 77 denotes a disk-shaped mounting portion, and an outer surface 79 of the mounting portion 77 has a smooth same diameter surface. Two communication holes 81 are formed near the center of the attachment portion 77. Among the mounting portions 77, two types of convex portions 83 and 89 are integrally formed on the opposing surface which corresponds to the upper surface side when viewed in FIG.
One of the convex portions 83 and 89 is an inclined convex portion 83, which has substantially the same shape as the inclined convex portion 65 described above, and is formed with an inclined pressure contact surface 85 and an inclined end portion 87. The other is a vertical convex portion 89, which also has substantially the same shape as the vertical convex portion 71 described above, and a vertical pressure contact surface 91 and a vertical end portion 93 are formed.
The arrangement of the convex portions 83 and 89 is also in a circular row as with the convex portions 65 and 71. However, the inclined end portion 87 of the inclined convex portion 83 protrudes beyond the vertical end portion 93 of the vertical convex portion 89. Further, the vertical pressure contact surface 91 of the vertical convex portion 89 is at a preceding position in the rotational direction indicated by the arrow in FIG. However, the degree of preceding is small.

FIG. 8 shows the assembled state of the knob 19.
The knob 19 is assembled with the components aligned in the direction shown in FIG. 4. First, an interposition member 41 is fitted inside the case 25. Since the recess 25 is provided in the case 25, the interposition member 41 is in a state where the top portion hits the recess 29.
The concave / convex row 43 on the outer surface of the interposing member 41 is fitted to the concave / convex row 35 on the inner side surface of the case 25 so as to face each other, and is fixed substantially immovably in both the axial direction and the circumferential direction. In this state, the support hole 47 is continuous with the support hole 31 of the case 25 in the axial direction.
Next, the support shaft 53 of the spring member 51 is passed through the support holes 47 and 31 so as not to move in the circumferential direction, and the mounting portion 57 on the case 25 side is fitted inside. The concave / convex row 59 on the outer side surface of the mounting portion 57 is loosely fitted to the concave / convex row 45 on the inner side surface of the interposed member 41 so as to face the concave / convex portion. Therefore, although it is slightly spaced in the axial direction, it can move positively. Since the spring piece 55 of the spring member 51 is in contact with the back side, i.e., the top side, irrespective of the pressure contact of the mounting portion 57, the spring force is resisted when the mounting portion 57 moves to the bottom surface side of the interposing member 41. It will be. FIG. 9 shows this state, showing the opposing surface of the mounting portion 57.

The clamp-side mounting portion 77 is fitted into the smooth annular inner surface 37 of the case 25 leaving a slight margin. The retaining claw 39 formed at the end of the case 25 is elastically deformed and fitted inside, and is retained.
Therefore, the mounting portion 77 can rotate relative to the case 25 around the axis.
Further, since the mounting portion 57 on the case 25 side is elastically biased by the spring member 51 against the mounting portion 77 on the movable clamp side, in the initial state, the inclined pressure contact surface 67 of the mounting portion 57 and the mounting portion The 77 inclined pressure contact surfaces 85 are in pressure contact with each other.

Next, the operation of the torque limiter mechanism will be described.
The knob 19 is configured as described above. As shown in FIG. 10, when the case 25 is grasped and turned to tighten the movable side clamp portion 15, as shown in detail in FIG. Since the inclined pressure contact surface 67 of the mounting portion 57 on the 25th side is in pressure contact with the inclined pressure contact surface 85 of the mounting portion 77 on the movable clamp 15 side, the inclined pressure contact surface 85 frictionally slides. The attachment portion 77 rotates integrally with the attachment portion 57. Accordingly, the male screw shaft 13 is screwed in the tightening direction, and moves from the imaginary line to the direction indicated by the solid line as shown in FIG. At this time, the vertical pressure contact surface 73 and the vertical pressure contact surface 91 are separated from each other.

  On the other hand, when the movable side clamp part 15 clamps the pole 105 sufficiently close to the fixed side clamp part 5 and then tries to rotate it, the torque becomes larger than a predetermined level, as shown in FIG. The limiter is activated. That is, as shown in detail in FIG. 11 (B), the inclined pressure contact surface 67 slides relative to the inclined pressure contact surface 85 against the elastic biasing force and relatively moves backward to rotate integrally. For this reason, the necessary frictional sliding area cannot be secured, and the inclined end portion 69 of the inclined pressure contact surface 67 easily gets over the inclined end portion 87 of the inclined pressure contact surface 85, as indicated by the phantom line, Only the mounting portion 57 on the case 25 side rotates, that is, the idling state. Therefore, the movable side clamp part 15 is prevented from being tightened excessively.

However, when used for a long time, as shown in FIG. 12 (B), the inclined pressure contact surfaces 67 and 85, particularly the relatively hard side inclined pressure contact surface 85 side, gradually wear while leading. The abrasion starts from the respective inclined end portions 69 and 87, and the degree of inclination decreases.
In this case, even if the torque is equal to or lower than a predetermined level, the end 69 of the worn inclined pressure contact surface 67a can easily get over the end 87 of the worn inclined pressure contact surface 85a. Accordingly, considering the relationship between the inclined pressure contact surface 67a and the inclined pressure contact surface 85a, the torque limiter is easily operated.

However, as the inclination degree of the inclined pressure contact surfaces 67a and 85a increases, the distance between the vertical pressure contact surface 73 immediately before the torque limiter operates and the vertical pressure contact surface 91 decreases, and when wear further progresses, the inclined pressure contact surface. Before falling into the constant torque limiter operating state by 67a, 85a, the inclined pressure contact surfaces 67, 85 are in the pressure contact state.
Since the vertical pressure contact surfaces 73 and 91 are not inclined with respect to the axial direction, the pressure contact state is not released even when a large torque is applied.
Therefore, when the case 25 is grasped by hand and turned to tighten the movable clamp 15, the vertical pressure contact surface 91 frictionally slides and the attachment 77 is integrated with the attachment 57 as shown in FIG. Rotate to. Accordingly, the male screw shaft 13 is screwed in the tightening direction, and moves from the imaginary line to the direction indicated by the solid line as shown in FIG.

  In the above-described state, the torque limiter function is lost because it is always in a rotating state, but the male screw shaft 13 can be moved, so that only the clamp function survives. Since the clamp device 1 is provided with a safety device that can survive this clamping function, it can be safely used in a medical device such as an infusion pump.

The embodiment of the present invention has been described in detail above. However, the specific configuration is not limited to this embodiment, and the present invention can be changed even if there is a design change without departing from the gist of the present invention. included.
For example, the positional relationship between the inclined pressure contact surface and the vertical pressure contact surface that correspond one-to-one is determined from the limit that allows the use of the torque limiter mechanism, and the determination is affected by the magnitude of torque, the strength of the component, and the like. Therefore, the optimum one is determined each time according to the specific clamping device.
Further, the clamping device of the present invention is not limited to the one to which the above-described infusion pump is placed, but may be used when supporting an apparatus other than the infusion pump or an article on the middle portion of the pole. It is. In addition, the pole is not limited to the one provided on the stand, but may be, for example, a type in which the upper end is supported on the ceiling and the lower end is supported on the floor.

  It has applicability to the manufacturing industry of clamp devices.

DESCRIPTION OF SYMBOLS 1 ... Clamp apparatus 3 ... Clamp base 5 ... Fixed side clamp part 7 ... Recessed part 9 ... Shaft support part 11 ... Female screw hole
DESCRIPTION OF SYMBOLS 13 ... Male screw shaft (shaft) 15 ... Movable side clamp part 17 ... Concave piece 19 ... Knob 21 ... Shaft fixing part 23 ... Push screw 25 ... Case 27 ... Anti-slip recessed part 29 ... Recessed part 31 ... Support hole 33 ... Communication hole 35 ... Concavity and convexity row 37 ... Inner surface 39 ... Retaining claw portion 41 ... Interposition member 43 and 45 ... Concavity and convexity row 47 ... Support hole 49 ... Communication hole 51 ... Spring member 53 ... Support shaft 55 ... Spring piece 57 ... Mounting portion 59 ... Concavity and convexity Row 61 ... Stepped portion 63 ... Communication hole 65 ... Inclined convex portion 67 ... Inclined pressure contact surface
69 ... Inclined end portion 71 ... Vertical convex portion 73 ... Vertical pressure contact surface
75 ... Vertical end portion 77 ... Mounting portion 79 ... Outer surface 81 ... Communication hole
83 ... Inclined convex portion 85 ... Inclined pressure contact surface 87 ... Inclined end portion
89 ... Vertical projection 91 ... Vertical pressure contact surface 93 ... Vertical end
101 ... Stand 103 ... Stand 105 ... Pole 107 ... Infusion pump

Claims (6)

A pair of clamp parts composed of a fixed-side clamp part and a movable-side clamp part, a manual rotation operation part, a rotary shaft whose one end side is connected to the movable-side clamp part and screwed, and the other end of the rotary shaft In a clamping device comprising a torque limiter mechanism with a safety device interposed between a side and the rotation operation unit,
Torque limiter mechanism with safety device
A plurality of the rotation operation unit and the rotation shaft are provided on opposite sides of the rotation operation unit, on the rotation operation unit side, the inclined convex surface with the inclined pressure contact surface facing the rotation direction side, and the vertical pressure contact surface faces the same direction side, The vertical pressure contact surface is the same as the pressure contact portion which is a vertical convex portion located behind the inclined pressure contact surface in the rotation direction, and the inclined convex portion where the inclined pressure contact surface faces the opposite side in the rotation direction on the movable side clamp portion side. A pressure contact portion which is a vertical convex portion which faces the direction side and is located behind the inclined pressure contact surface in the rotation direction, and the rotation operation portion side pressure contact portion with respect to the movable clamp side pressure contact portion. It is composed of elastic urging means that urges elastically from the direction, and in the initial state, when the inclined pressure contact surfaces come into contact with each other, the vertical pressure contact surfaces are set so as not to contact each other apart from each other,
When a biasing force is received from the elastic biasing means , the clamping functions work in a state in which the inclined pressure contact surfaces are brought into pressure contact with each other and the torque limiter is operable. A clamping device characterized in that the clamping surfaces are kept in contact with each other by press-contacting the pressure-contact surfaces, and the clamping function is maintained safely. The clamping device according to claim 1,
Mounting portions are provided on the opposite sides of the rotation operation portion and the rotation shaft, and a plurality of inclined convex portions and a plurality of vertical convex portions are arranged coaxially in each mounting portion so as to draw a circle. A clamping device characterized by that. The clamping device according to claim 2,
The clamp device characterized in that the mounting portion and the convex portion are formed of an integral resin molded product, and the rotational operation portion side is softer than the movable clamp side. The clamping device according to claim 3, wherein
The elastic urging means is constituted by a spring piece spread in the shape of an umbrella frame, and the spring piece urges the mounting portion on the rotation operation portion side from the back side irrespective of the pressure contact. apparatus. The clamping device according to any one of claims 2 to 4,
A clamping device, wherein the circular rows of inclined convex portions are arranged outside the circular rows of vertical convex portions. The clamping device according to any one of claims 1 to 5,
A clamping device characterized by being used for attaching a medical device to a pole of a stand.

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