JP2009012600A - Fixing structure for base - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing structure for a base in which operation for fixing and releasing the base to a floor surface is easy. <P>SOLUTION: When a front side area than a hinge point of a foot pedal part is stepped, a lever part is downwardly turned, an arm part is also downwardly turned, a stopper part is downwardly pushed by the arm part, a rubber leg of the stopper part is brought into pressure-contact with the floor surface, and the base becomes in the fixed state. At this time, since a slider part is slid to a rear side of the lever part, an engagement part at the slider part side is engaged with an engagement part at a foot pedal part side and slide to an opposite side is suppressed, the fixed state of the base is maintained in the state that the lever part is downwardly turned. When the fixed state is released, a rear side area than the hinge point of the foot pedal part is stepped. If so, a front side of the foot pedal part is left from the lever part and mutual engagement of the engagement parts is released. Accordingly, since the lever part is upwardly turned and the stopper is raised, a caster is abutted on the floor surface and the fixed state is released. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fixing structure for a base located at a lower portion of a device main body.

  Conventionally, the base located at the lower part of the apparatus main body can hold the apparatus main body in an originally standing state and can move or fix the apparatus main body with respect to the floor surface. Therefore, the base is provided with a plurality of moving means such as casters and rollers for moving the base, and a stopper portion that is pressed against the floor surface to fix the base. Then, the moving means or the stopper portion is selectively protruded downward by the vertical lift means provided on the base to obtain a moving state or a fixed state of the base.

  A toggle link mechanism is used as the vertical lift means. The toggle link mechanism has a pair of front and rear handles as a stepping operation part. When one handle is stepped on with the foot and the toggle link is tilted to one side, the moving means descends, and the other handle is stepped on with the foot. When tilted to the other side, the stopper part descends. Also, because of the toggle link mechanism, when stepping on the other handle and releasing the state with one handle, for example, the other handle with the footpad is used to prevent the base from falling down against the floor surface. It is necessary to step on one handle with a toe so as to apply a fall brake while stepping on (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-16505

  However, in such a conventional technique, when the base is fixed and when the base is released, the position of the step (handle) to be stepped on with the foot is greatly different. In order to step on each handle alternately, the operator needs to change the posture, and the operation is troublesome.

  In addition, because of the toggle link mechanism, when the other handle is stepped on, it is necessary to step on one handle lightly in order to prevent the base from falling down vigorously. In this respect, the operation is troublesome.

  The present invention has been made paying attention to such a conventional technique, and provides a base fixing structure that is easy to fix and release the base with respect to the floor surface.

  According to a first technical aspect of the present invention, there is provided a base fixing structure for fixing a base, which is located at a lower part of the apparatus main body and has a plurality of moving means with respect to the floor surface, to the floor surface, A stopper part that is assembled to the inside of the base so as to freely move up and down and presses against the floor surface to fix the base when lowered, and is biased upward with respect to the inside of the base; A first lever pivotally supported around a first fulcrum fixed in position, and movable in the longitudinal direction of the first lever on the first force point side with respect to the first fulcrum. And a second lever pivotally supported around a second fulcrum fixed at a position different from the first fulcrum inside the base, the second force point being the first lever The second fulcrum and the second force A second action point movable in the longitudinal direction of the second lever is positioned between the second action point and the second action point acting downward on a part of the stopper portion. Features.

  According to the second technical aspect of the present invention, a shaft is provided around the first engagement portion fixed at the first action point of the first lever and the third fulcrum fixed at the first lever. A third lever as a foot pedal to be supported, wherein the first force point is positioned at the third lever, and the opposite side of the first fulcrum is separated from the first lever with respect to the third fulcrum. And a second engagement portion fixed to the third lever on the first fulcrum side with respect to the third fulcrum, wherein the opposite side of the first fulcrum is separated from the first lever. The first engagement portion is engageable with the first engagement portion so that the first engagement portion is prevented from moving in conjunction with the upward rotation around the first fulcrum of the first lever. It is further characterized by further comprising.

  According to a third technical aspect of the present invention, the stopper portion is assembled to the rail portion along the vertical direction provided in the base so as to freely move up and down, and the spring portion is attached to the rail portion by the spring portion. The stopper portion is biased upward, the first lever is a lever portion, one end of the first force point side protrudes from the base with respect to the first fulcrum, and the first action point is the The first engagement portion and the second engagement portion are fixed to the slider portion that is slidably assembled along the longitudinal direction of the lever portion, and the first engagement portion and the second engagement portion are the first fulcrum of the slider portion when the lever portion is rotated downward. Engaged with the other end of the lever portion, and pivotable in a direction away from the lever portion around the third fulcrum, and the other end and the lever. The other end between Spring portions for pressurizing is further characterized in that provided on the foot pedal.

  According to the first technical aspect, the first lever, the second lever, and the rotation center (fulcrum) are fixed to the base at different positions. Because of the difference in the trajectory of the lever, if the first action point, to which the second force point is fixed, is moved backward by the addition (input) of the external force to the first force point, the first lever mechanical gain is reduced. However, since the mechanical gain increases rapidly as the second action point moves closer to the second fulcrum, the combined gain at the second action point increases stably.

  According to the second technical aspect, when the first action point with the second force point fixed moves backward, the second lever second engagement portion is fixed with the first lever. Engage with the mating part to prevent movement to the opposite side. Therefore, even if the external force is not input to the first force point, the state in which the first lever is rotated downward is maintained as it is, and the base is also fixed. On the other hand, when the first force point (external force input point) is positioned on the opposite side of the third lever, the first lever is disengaged from the first lever. Is rotated upward by the balance between the upward action of the stopper portion and the external force, and the base is released.

  According to the third technical aspect, when the region on one end side (first fulcrum side) from the hinge point (third fulcrum) of the foot pedal is stepped on, the lever portion rotates downward and the arm portion also moves downward. , And the arm portion pushes the stopper portion downward, the stopper portion is pressed against the floor surface, and the base is fixed. At this time, the slider portion slides to the other end side of the lever portion, the second engaging portion on the slider portion side engages with the first engaging portion on the foot pedal portion side, and sliding to the opposite side is prevented. Therefore, the state in which the lever portion is rotated downward is maintained and the fixed state of the base is maintained.

  Next, when releasing the fixed state, a step on the other end (outside) side of the foot pedal part is stepped on. If it does so, the one end side of a foot pedal part will detach | separate from a lever part, and engagement of engagement parts will be cancelled | released. Therefore, the lever portion is rotated upward using the upward biasing force of the spring portion. When the lever portion is rotated upward, the arm is also rotated upward, and the stopper portion is also lifted, so that the fixed state is released and the moving means comes into contact with the floor surface.

  In both cases of fixing and releasing, since only the foot pedal part is stepped on, the operator does not need to change his / her posture even when fixing and releasing are performed continuously. Moreover, when canceling, it is not necessary to step on two places at the same time as in the prior art, and it is sufficient to step on one place. Therefore, the operation of fixing and releasing the base with respect to the floor surface is easy.

  Hereinafter, preferred embodiments of the present invention will be described. In the drawing, the direction A will be described as the front side (one end side), and the direction B will be described as the rear side (the other end side).

  FIG. 1 shows a medical stand device 2 that supports a surgical microscope 1. A base 3 is provided at the lower part of the stand device 2 which is the device body. The base 3 has a cross shape protruding in four directions in plan view, and has a hollow structure opened downward. In the following, the upper and lower portions in a state where the base 3 can be used by being attached to the stand device 2 are referred to as “upper” and “lower” for convenience.

  Casters 4 are provided at the four corners of the base 3 as moving means. A part of the caster 4 protrudes below the lower end of the base 3, and the entire stand device 2 can be moved or rotated by rolling the caster 4 with respect to the floor surface 5. .

  Two plate-like rail portions 6 are juxtaposed on the upper surface of the base 3 with a predetermined distance S (see FIG. 5) therebetween. The rail portion 6 is formed downward from the upper surface of the base 3 in a state along the vertical direction.

  A round bar-shaped shaft 7 is installed between the lower end portions of the two rail portions 6. In addition, pins 8 are provided at the upper end portions of the two rail portions 6 so as to protrude rearward.

  A stopper portion 9 is assembled to the two rail portions 6 so as to be movable up and down. The stopper portion 9 includes a linear motion frame portion 10 and a rotation frame portion 11. The linear motion frame portion 10 has a frame shape inscribed in the rail portion 6 in a state of surrounding the two rail portions 6, and moves linearly up and down along the rail portion 6. Therefore, the movement of the stopper portion 9 in the lateral direction is restricted by the rail portion 6 and can move linearly in the vertical direction.

  A round bar-shaped shaft 12 corresponding to a predetermined interval S of the rail portion 6 is provided on the rear side of the linear motion frame portion 10. Also, pins 13 are provided on both sides of the shaft 12 in the linear motion frame portion 10 so as to protrude rearward.

  Both ends of the spring portion 14 are locked between the pin 13 on the linear motion frame portion 10 side and the pin 8 on the rail portion 6 side, and the spring portion 14 always moves the linear motion frame portion 10 upward. It is energizing towards.

  A central portion of the rotating frame portion 11 is pivotally supported via a center shaft 15 at a central portion of the front surface of the linear motion frame portion 10. The rubber feet 16 are attached to both ends of the rotating frame portion 11 so as to face downward, and the rubber feet 16 are movable up and down by the rotation of the rotating frame portion 11.

  In front of the rail portion 6 on the upper surface of the base 3, a bifurcated portion 18 in front of the lever portion (first insulator) 17 is provided between the support pieces 19 formed integrally with the base 3, and the rotary shaft 20 (see FIG. 20) is pivoted around. The rotation shaft 20 (first fulcrum) is fixed with respect to the base 3.

  The rear of the lever portion 17 has a narrow structure, and after passing through a predetermined interval S between the rail portions 6, the lever portion 17 projects from the opening 21 formed in the base 3 to the outside of the base 3. .

  The rear end of the lever portion 17 is an input portion that serves as a first leverage point, and a foot pedal portion 22 is provided on the upper surface. The foot pedal portion (third lever) 22 is a first-type lever, and a protrusion 23 sandwiching the lever portion 17 is formed on the lower surface. The hinge point (third fulcrum) 24 of the protrusion 23 is It is pivotally attached to the side surface.

  A gap D (see FIG. 11) is provided on the lower surface behind the hinge point 24 of the foot pedal portion 22, and the rear end of the foot pedal portion 22 approaches the lever portion 17 side by this amount. The foot pedal portion 22 rotates around the hinge point 24, and the front portion of the foot pedal portion 22 from the hinge point 24 is separated from the lever portion 17.

  A spring portion 25 is provided between the rear end of the foot pedal portion 22 and the lever portion 17, and always presses and urges the rear end of the foot pedal portion 22 upward. Accordingly, the front portion of the foot pedal portion 22 from the hinge point 24 is kept in close contact with the upper surface of the lever portion 17.

  A long hole 26 is formed in front of the hinge point 24 of the lever portion 17, and a groove portion 27 corresponding to the long hole 26 is formed in the lower surface of the foot pedal portion 22. On the lower surface of the foot pedal portion 22, a slider portion 28 that is slidable along the long hole 26 is provided. On the front side of the slider portion 28, a bulging portion 29 that passes through the long hole 26 and expands in the groove portion 27 is formed to prevent the slider portion 28 from coming off from the long hole 26. The slider portion 28 is an output portion including an action point movable in the longitudinal direction of the first lever.

  The slider portion 28 is provided with an engaging portion (second engaging portion) 30 having a tooth shape facing upward, and is fixed at the first lever operating point. In addition, an engaging portion (first engaging portion) 31 having a tooth profile facing downward is provided behind the long hole 26 of the foot pedal portion 22. As will be described later, the movement of the first lever point 37 in the longitudinal direction is restricted by the engagement of the first engagement portion 31 and the second engagement portion 30.

  A shaft 7 formed between the two rail portions 6 supports a front end of an arm portion 32 having a width corresponding to a predetermined interval S so as to be rotatable, and a rear end of the arm portion 32 is bifurcated. And is supported on the side surface of the slider portion 28. The rotational axis (second fulcrum) of the shaft 7 is fixed to the base 3 via the rail portion 6. The arm portion (second insulator) 32 is bent in a crank shape, and a contact surface 33 (see FIG. 9) of the linear motion frame portion 10 with respect to the shaft 12 is formed on the front lower surface thereof. The arm portion constitutes a second type lever having the rotation axis of the shaft 7 as a fulcrum.

  Since the second arm portion 32 and the first lever portion 17 are positioned vertically between the two rail portions 6, the overall structure can be made compact (FIG. 6). reference). The first lever lever 17 and the second lever arm 32 are pivotally supported at positions where their fulcrums are displaced from the base, and the first lever action point (output point) is the second lever point (input). Point), the respective mechanical amplification factors are combined and act downward on the stopper as a load.

  Further, since the first lever action point and the second lever force point are movable in the longitudinal direction of the first lever, the first lever and the second lever are mechanically amplified as the lever is turned as will be described later. The rate of gain is adjusted appropriately, and the mechanical amplification rate that is stably synthesized increases. That is, according to the fixing structure of the base of the present invention, the synthesized mechanical amplification factor gradually increases as the lever portion 17 rotates downward, and the position immediately before the position where the base is fixed. The base can be easily fixed by configuring so that the gain increases rapidly.

  In addition, since the first and second pivot trajectories are on substantially the same virtual plane and the base can be fixed and released by interlocking and engaging the two levers, a compact base fixing structure Can be realized.

  Next, the operation of this embodiment will be described. When the base 3 is set in a fixed state, an external force is input to the first lever by stepping on a region in front of the hinge point 24 of the foot pedal portion 22 with a predetermined stepping force F. The stepping position is the first leverage point. Then, the lever portion 17 is rotated downward and the arm portion 32 is also rotated downward, so that the shaft 12 of the linear motion frame portion 10 is pushed downward by the contact surface 33 of the arm portion 32 and the stopper portion 9. The whole slides downward along the rail portion 6.

  When the shaft 12 is pushed by the contact surface 33 of the second arm portion 32, the contact point between the contact surface 33 and the shaft 12 becomes the second action point (second action point). In this case, as shown in FIG. 9, the initial interval L1 between the front end of the arm portion 32, which is the rotation center, and the shaft 12 becomes a smaller interval L2 as the lever portion 17 rotates downward. Therefore, the mechanical amplification factor is increased by the lever principle, and the stopper portion 9 is given a large force at the final stage in the rotation range of the arm portion 32.

  Therefore, a large force can be obtained at the final stage where the rubber feet 16 of the stopper portion 9 are in contact with the floor surface 5. As shown in FIG. 8, the stroke is adjusted so that the rubber foot 16 protrudes downward by a slight dimension d from the floor surface 5, and the rubber foot 16 contacts the floor surface 5 with a strong pressure, The base 3 is securely fixed.

  Since the lever portion 17 and the arm portion 32 have different rotation centers, when the lever portion 17 is rotated downward, the slider portion 28 slides rearward along the lever portion 17 due to the difference in the rotation trajectory of both. The engaging portion 30 on the slider portion 28 side is engaged with the engaging portion 31 on the foot pedal portion 22 side, and sliding to the opposite side is prevented. Therefore, even if the foot is released from the foot pedal portion 22, the fixed state of the base 3 is maintained without changing the lever portion 17 in the downward direction.

  Further, since the rotating frame portion 11 that presses the rubber feet 16 at both ends to the floor surface 5 is rotatable in the vertical direction around the center shaft 15, the pressure in contact with the floor surface 5 of the rubber feet 16 becomes equal, A biased stress does not occur in the stopper portion 9, and a stable fixed state is obtained.

  Next, when releasing the fixed state, a region behind the hinge point 24 of the foot pedal portion 22 is stepped on with a predetermined stepping force F. Then, the rear end of the foot pedal part 22 descends against the spring part 25, the foot pedal part 22 rotates around the hinge point 24, and the front region of the foot pedal part 22 from the hinge point 24 is the lever part. Get away from 17.

  Therefore, the engagement between the engagement portions 30 and 31 is released. When the engagement between the engagement portions 30 and 31 is released, the force for maintaining the downward rotation state of the lever portion 17 is lost. Therefore, when the force applied to the foot pedal portion 22 is weakened, the linear motion frame portion 10 is spring-loaded. Due to the urging force of the portion 14, the arm portion 32 is lifted while being lifted, and accordingly, the lever portion 17 is also rotated upward.

  When the stopper portion 9 is raised, the caster 4 is in contact with the floor surface and the base 3 can be moved instead.

  As described above, according to this embodiment, it is not necessary to change the posture because only the foot pedal unit 22 steps on the foot pedal unit 22 when it is fixed or released. Moreover, when canceling, it is not necessary to step on two places at the same time as in the prior art, and it is sufficient to step on one place. Therefore, the operation of fixing and releasing the base 3 with respect to the floor surface 5 is easy.

1 is an overall perspective view of a medical stand device having a base according to an embodiment of the present invention. The expansion perspective view which shows a foot pedal part. The perspective view which shows the state which turned the base over. The perspective view which shows the internal structure of a base. The disassembled perspective view which shows the internal structure of a base. The bottom view which shows the internal structure of a base. Sectional drawing which shows the non-fixed state of a base. Sectional drawing which shows the fixed state of a base. Explanatory drawing which shows the relationship between an arm part and a shaft. The perspective view which shows the lower surface of a lever part. Sectional drawing which shows the lever part and foot pedal part of an unfixed state. Sectional drawing which shows the lever part and foot pedal part of a fixed state. Sectional drawing which shows the lever part and foot pedal part which show the state which cancelled | released engagement of engagement parts. Sectional drawing which follows the arrow SA-SA line in FIG.

Explanation of symbols

2 Stand device (device body)
3 Base 4 Caster (moving means)
5 Floor 6 Rail part 7 Shaft (of rail part)
9 Stopper part 10 Linear motion frame part 11 Rotating frame part 12 Shaft (of stopper part)
14 Spring part 15 Center shaft 17 Lever part 22 Foot pedal part 24 Hinge point 28 Slider part 30, 31 Engagement part 32 Arm part A Front side (one end side)
B Rear side (other end side)
S Predetermined interval F Stepping force

Claims (5)

A base fixing structure for fixing a base having a plurality of moving means with respect to a floor surface located at a lower portion of the apparatus main body to the floor surface,
A stopper part that is assembled vertically with respect to the inside of the base and that presses against the floor surface to fix the base when lowered, and is biased upward with respect to the inside of the base;
A first lever pivotally supported around a first fulcrum fixed in position inside the base, the first lever being movable in the longitudinal direction of the first lever on the first force point side with respect to the first fulcrum. 1 action point is positioned,
A second lever pivotally supported around a second fulcrum fixed at a position different from the first fulcrum inside the base, the second force point being fixed to the first action point of the first lever; A second action point that is movable in the longitudinal direction of the second lever is positioned between the second fulcrum and the second force point;
The base fixing structure, wherein the second action point of the second lever acts downward on a part of the stopper portion. A first engagement portion fixed at the first action point of the first lever;
A third lever as a foot pedal pivotally supported around a third fulcrum fixed to the first lever, wherein the first force point is positioned on the third lever, and The one opposite to the first fulcrum is biased away from the first lever;
A second engaging portion fixed to the third lever on the first fulcrum side with respect to the third fulcrum, wherein the opposite side of the first fulcrum is separated from the first lever; A first lever that is engageable with the first engagement portion so as to prevent movement of the first engagement portion in conjunction with upward rotation about the first fulcrum; The base fixing structure according to claim 1, wherein: The stopper portion is assembled to the rail portion along the vertical direction provided in the base so as to be freely movable up and down, and the stopper portion is urged upward by a spring portion with respect to the rail portion,
The first lever is a lever portion, and one end on the first force point side with respect to the first fulcrum protrudes to the outside of the base,
The first action point is fixed to a slider portion that is slidably assembled along the longitudinal direction of the lever portion,
When the lever portion is rotated downward, the first engagement portion and the second engagement portion engage so as to prevent the slider portion from sliding toward the first fulcrum side,
On the upper surface of the other end side of the lever portion, a spring portion that is rotatable in a direction away from the lever portion around the third fulcrum and presses the other end between the other end and the lever portion. The base fixing structure according to claim 2, wherein the base is provided on the foot pedal. Two rail portions are arranged in parallel with each other, and a shaft as a part of the stopper portion is installed between the lower end portions of the two rail portions,
The second lever is an arm portion, and one end of the arm portion having a width capable of passing between the two rail portions is pivotally supported on the shaft.
The base fixing structure according to claim 3, wherein the lever portion is passed between the two rail portions.   The stopper portion is composed of a linear motion frame portion that moves up and down along the rail portion, and a rotation frame portion that is rotatable in the vertical direction on both sides around a center axis with respect to the linear motion frame portion, The base fixing structure according to claim 3 or 4, wherein both ends of the rotating frame portion are in pressure contact with the floor surface when fixed.

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