JP5312213B2 - Headrest device and medical / dental clinic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a headrest device capable of naturally tilting a headrest and capable of relieving burdens on an operator in tilting the headrest. <P>SOLUTION: The headrest device 2 includes a headrest support plate 211, and a support part attached to a back panel to support the support plate 211 in the rear of the back panel. The support plate 211 is connected to the support part via a first arm 4 so as to be rotatable around a first horizontal shaft 44 perpendicular to longitudinal direction to the support part and movable in the longitudinal direction. Further, the support plate 211 is connected to the support part via a second arm 5 so as to be movable in the longitudinal direction along the direction of downward inclination toward the front while rotating around a second horizontal shaft 55 perpendicular to the longitudinal direction to the support part. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a headrest device used in a medical / dental clinic, and a medical / dental clinic having the headrest device.

  As headrest devices used in medical / dental clinics, for example, devices disclosed in Patent Documents 1 to 5 are known. Patent Document 1 discloses a headrest angle imparting device in which a movable block 4 is movably guided along a ledge 4a. Patent Document 2 discloses a headrest including two link members 5 and 6 that are connected and oscillated. In Patent Documents 3 and 5, an apparatus having a mechanism for guiding the headrest in an arc shape is shown. Specifically, in Patent Document 3, an arc-shaped support square tube 3 for supporting the armrest 2 is provided. It is slidably fitted to the arcuate support angular shaft 5, and in Patent Document 5, a pin 75 that pushes up the headrest 15 moves in a substantially arcuate guide groove 72. Patent Document 4 shows a medical bed that is adjusted by a parallelogram link 10 having rotating links 12 and 13 and a translation link 14.

JP-A-6-98913 JP 2003-310474 A Japanese Patent Laid-Open No. 7-96012 Utility Kaihei 6-80424 Japanese Patent Laid-Open No. 2005-1224796

  Patent Document 1 proposes a headrest 2a in which sliding and rotation are combined in order to realize a natural tilting (moving while tilting) of the headrest. In this headrest 2a, the cervical spine accompanying the head rotation is proposed. Since the reproducibility of the complicated movement is poor, the viewing section cannot move during rotation and the relative distance between the viewing section and the surgeon cannot be maintained, so that the burden on the surgeon is large. In the apparatus of Patent Document 2, the apparatus becomes expensive due to the thickness and complicated structure of the link member. In the devices of Patent Documents 3 and 5, a mechanism for guiding the headrest in an arc shape projects over the operator's feet and interferes with the operator. In the device of Patent Document 4, since the link mechanism has a large thickness, the link mechanism disturbs the operator.

Furthermore, the following problems have been conventionally presented in the headrest device.
(1) Realize natural tilting to reduce the burden on the patient as much as possible when tilting the headrest. In addition, in order to reduce the burden on the surgeon due to the tilt as much as possible, a tilt with little misalignment of the viewing section should be realized.
(2) The headrest can be tilted to a position corresponding to various medical forms by the operator.
(3) The tilt mechanism is compact and does not interfere with the surgeon.
(4) A manual method or an electric method can be adopted as the drive method of the tilt mechanism.
(5) An inexpensive device can be provided without significantly increasing the number of parts and mechanisms.

  An object of the present invention is to provide a headrest device capable of realizing natural tilting of the headrest and solving the various problems as described above.

The present invention relates to a headrest device used by being attached to the inside of a back plate so that the patient's head can be supported at the rear end of the back plate in the longitudinal direction of a medical / dental examination table
A headrest to support the patient's head;
A support portion attached to the back plate to support the headrest behind the back plate;
With
The headrest is supported via the first arm so as to be rotatable about the first horizontal axis perpendicular to the front-rear direction with respect to the support part and so as to be movable in the front-rear direction. Are connected to
Furthermore, the headrest can move in the front-rear direction along the inclined direction that is lowered toward the front while rotating around the second horizontal axis perpendicular to the front-rear direction with respect to the support portion. Connected to the support through the second arm,
It is characterized by that.

Specifically, the following configuration (1) or (2) can be adopted.
(1) One end of the first arm is rotatably connected to the front portion of the headrest, and the other end of the first arm is rotatably connected to the first horizontal axis of the support portion. One end of the second arm is rotatably connected to the back surface of the headrest behind the one end of the first arm, and the other end of the second arm is connected to the tilt direction via the second horizontal axis. Is provided so as to be slidable on the inclined guide portion formed along the surface.

(2) One end of the first arm is fixed to the front portion of the headrest, and the other end of the first arm is pivotally connected to the first horizontal axis of the support portion, and front and rear to the support portion. The front and rear guide portions formed in the direction are slidably provided, and one end of the second arm is pivotally connected to the back surface of the headrest behind the one end of the first arm. The other end of the two arms is slidably provided on an inclined guide portion formed along the inclination direction via the second horizontal axis.

  In the present invention, the headrest is connected to the support portion via the first arm, and thus moves in the front-rear direction while rotating about the first horizontal axis with respect to the support portion. In addition, the headrest is connected to the support portion via the second arm, and thus moves in the front-rear direction along the inclined guide portion while rotating around the second horizontal axis with respect to the support portion. Thereby, the headrest is inclined in the front-rear direction while moving as a whole in the front-rear direction. Such a combination of movements can sufficiently reproduce the movement of the cervical vertebra when a human tilts the neck in the front-rear direction. Therefore, according to the present invention, natural tilting of the headrest that can reduce the burden on the patient can be realized. Further, it is possible to perform a tilting operation of the headrest that can change only the angle of the target portion while suppressing the positional shift of the viewing portion accompanying the adjustment of the headrest. Therefore, the surgeon can cope with various medical treatment forms even from a certain position without performing unnecessary posture adjustment.

  Moreover, in this invention, the headrest is only connected with the support part via the 1st arm and the 2nd arm. Therefore, according to the present invention, the connecting mechanism, that is, the tilting mechanism can be simplified, so that the tilting mechanism can be made compact, and the tilting mechanism can be prevented from being obstructed by projecting near the operator's feet.

  Furthermore, the headrest device of the present invention operates only by moving the second horizontal axis, to which the second arm is connected, back and forth. The second horizontal axis can be moved manually or electrically. Therefore, since the headrest device of the present invention can be employed either manually or electrically as a tilting mechanism drive system, it can be provided inexpensively and easily in various types of equipment, and is highly versatile.

It is a perspective view which shows the medical treatment unit provided with the medical dental stand of this invention. FIG. 2 is a schematic cross-sectional view along the longitudinal direction of the medical table in FIG. 1. It is a perspective view of the headrest device of a 1st embodiment. It is a perspective view of the headrest apparatus which removed the cover body. FIG. 5 is a plan view of the headrest device of FIG. 4. FIG. 6 is a view on arrow VI in FIG. 5. It is a VII arrow line view of FIG. FIG. 6 is a view taken along arrow VIII in FIG. 5. It is IX arrow line view of FIG. It is XX cross-section schematic of FIG. It is a perspective view which shows the transition of the action | operation of a headrest apparatus. It is a principal part front view which shows the transition of the action | operation of a headrest apparatus. It is a figure which shows the movement locus | trajectory of a support plate etc. in the action | operation of FIG. It is a principal part front view of the headrest device of a 2nd embodiment. FIG. 15 is a schematic cross-sectional view taken along the line XV-XV in FIG. It is a figure equivalent to FIG. 15 which shows an example of the deformation | transformation structure of 2nd Embodiment.

[First Embodiment]
FIG. 1 shows a medical / dental practice unit 100. The unit 100 includes a medical table 101 of the present invention, a treatment table 102, and an operator chair 103. The medical table 101 includes a chair body 11 and a base 12 that supports the chair body 11. A foot switch 13 for operating the raising / lowering operation of the chair body 11 is connected to the base 12. The treatment table 102 includes various treatment handpieces 104.

  The chair body 11 includes a leg plate 14, a seat plate 15, a back plate 16, and the headrest device 2 of the present embodiment. The headrest device 2 is attached inside the back plate 16 so that the patient's head can be supported at the rear end of the back plate 16 in the longitudinal direction (arrow X direction) of the chair body 11. The longitudinal direction is a direction along the connecting direction of the leg plate 14, the seat plate 15, and the back plate 16, the leg plate 14 side is “front”, and the back plate 16 side is “rear”, This directionality is the same regardless of whether the back plate 16 is sleeping or waking up.

  FIG. 2 is a schematic cross-sectional view showing the chair body 11 of FIG. 1 cut along the longitudinal direction, that is, the front-rear direction. The headrest device 2 includes a headrest 21 for supporting a patient's head and a support portion 3. The support portion 3 is attached to the back plate 16 so as to support the headrest 21 behind the back plate 16. The headrest 21 is configured by attaching a rest member 210 to the surface of the support plate 211.

  Below, the specific structure of each part of the headrest apparatus 2 is shown. FIG. 3 is a perspective view of the headrest device 2. The support plate 211 is connected to the support unit 3 via one first arm 4 and two second arms 5. The support unit 3 includes a substrate 301, a cover body 302 that covers the substrate 301, and a wall portion 30 that is assembled to the substrate 301 and the cover body 302.

  FIG. 4 is a perspective view of the headrest device 2 with the cover body 302 removed. FIG. 5 is a plan view of the headrest device 2 of FIG. 6 is a view taken in the direction of arrow VI in FIG. 7 is a view taken along arrow VII in FIG. FIG. 8 is a view taken along arrow VIII in FIG. FIG. 9 is a view taken along arrow IX in FIG. FIG. 10 is a schematic cross-sectional view taken along the line XX of FIG.

  In the present embodiment, the first arm 4 is provided at the center of the headrest device 2 in the direction perpendicular to the front-rear direction (that is, the width direction (arrow Y direction)). One end 41 of the first arm 4 is rotatably connected to a horizontal shaft 42 fixed to a front bearing portion 212 on the back surface of the support plate 211. The horizontal shaft 42 extends in the width direction. On the other hand, the support portion 3 has wall portions 30 on both sides in the width direction of the rear portion. As shown in FIGS. 8 and 10, the other end 43 of the first arm 4 is rotatably connected to a horizontal axis (first horizontal axis) 44. Both ends of the horizontal shaft 44 are fixed to both wall portions 30 of the support portion 3, and the other end 43 of the first arm 4 is connected to the center portion in the width direction of the horizontal shaft 44. The horizontal shaft 44 also extends in the width direction. The first arm 4 is curved so as to be slightly convex toward the front. Thus, the support plate 211 can be rotated around the horizontal axis 44 with respect to the support portion 3 by being connected to the support portion 3 as described above via the first arm 4. And it is movable in the front-back direction.

  The second arm 5 is provided on both sides of the headrest device 2 in the width direction. One end 51 of the second arm 5 is rotatably connected to a horizontal shaft 52 fixed to the bearing portion 213 on the back surface of the support plate 211. The bearing portion 213 is provided behind the bearing portion 212 of the first arm 4. The horizontal shaft 52 extends in the width direction. The other end 53 of the second arm 5 is slidably provided on an inclined guide portion 54 provided on the wall portion 30 of the support portion 3. As shown in FIG. 10, the other end 53 of the second arm 5 is supported by a bearing 56 that can slide in the inclined guide portion 54 via a horizontal axis (second horizontal axis) 55. The horizontal shaft 55 extends in the width direction. Specifically, one end 551 of the shaft constituting the horizontal shaft 55 is fixed to the other end 53 of the second arm 5, and the other end 552 is fixed to the inner race 561 of the bearing 56. The bearing 56 is slidable in the inclined guide portion 54 when the outer race 562 rotates in the inclined guide portion 54. The inclined guide portion 54 includes a long groove 541 that is lowered toward the front. This long groove 541 is curved so as to draw a slightly convex arc toward the surface side of the back plate 16 that contacts the patient's back (upward in FIGS. 6 and 7).

  The second arm 5 further has an extending portion 58 extending forward. A distal end portion 581 of the extending portion 58 is rotatably connected to a horizontal shaft 571 fixed to the moving block 57. The horizontal shaft 571 extends in the width direction. The moving block 57 is provided in the support portion 3 so as to be movable in the front-rear direction.

  As described above, the support plate 211 is connected to the support portion 3 through the second arm 5 as described above, so that the support plate 211 is tilted while rotating around the horizontal axis 55 with respect to the support portion 3. It can move in the front-rear direction along the guide portion 54.

  The support portion 3 is provided with a lock mechanism 6 for fixing the moving block 57, that is, the second arm 5 at a predetermined position in the front-rear direction. The lock mechanism 6 includes a lock operation part 60, a lever 61, a claw part 62, and a stopper part 63. The lock operation unit 60 is provided on the side surface of the support plate 211, and the front portion is integrally connected to the lever 61. The lever 61 extends in the front-rear direction and is located on the outer side in the width direction of the one second arm 5. The claw portion 62 is provided at the base end portion 611 of the lever 61 and integrally with the moving block 57, and is integrated with the lock operation portion 60 in accordance with an operation of pushing and releasing the lock operation portion 60 in the width direction. The front end portion 612 of the lever 61 is slightly moved in and out in the width direction, so that the entire structure has flexibility in the width direction. In this structure, when the lock operation unit 60 is operated in the width direction, the base end portion 611 of the lever 61 can be interlocked and act in the width direction (opposite to the operation direction). The fitting state between the provided claw 62 and the stopper 63 can be operated. The stopper portion 63 is a frame body that is fixed to the support portion 3 and extends in the front-rear direction. The stopper portion 63 includes a plurality of recesses 631 in the front-rear direction in which the advanced claw portions 62 are fitted. The claw portion 62 fitted in the concave portion 631 has a configuration in which it is detached backward when a force in the backward direction is applied, but is not removed forward even when a force in the forward direction is applied.

  The operation of the headrest device 2 having the above-described configuration is as follows. FIG. 11 is a perspective view showing a change in the operation of the headrest device 2, and FIG. 12 is a front view of a main part showing a change in the operation of the headrest device 2. In both figures, (A) shows a state in which the support plate 211 of the headrest 21 is most horizontal, that is, a state when the headrest device 2 is extended, and (C) shows a state in which the support plate 211 is most inclined. That is, the state at the time of shortening of the headrest apparatus 2 is shown, (B) has shown the substantially intermediate | middle state of (A) and (C). In the state (A), the moving block 57 is located at the rear end of the movable region in the support portion 3, and the other end 53 of the second arm 5 is located at the rear end of the inclined guide portion 54.

  In the state of (A), the lock operation part 60 is operated to move the tip part 612 of the lever 61 inward to retract the claw part 62, thereby removing the claw part 62 from the recessed part 631 and moving the moving block 57. When moved forward, the second arm 5 is pulled forward by the extending portion 58, and the other end 53 moves forward along the inclined guide portion 54. At this time, one end 41 of the first arm 4 rotates in the direction of the arrow R1 around the horizontal axis 42, and the other end 43 (see FIGS. 8 and 10) rotates in the direction of the arrow R1 around the horizontal axis 44. The second arm 5 has one end 51 that rotates about the horizontal axis 52 in the direction of the arrow R1. Accordingly, in FIG. 12, one end 41 of the first arm 4 moves obliquely upward and forward, and one end 51 of the second arm 5 moves obliquely downward and forward. Accordingly, the support plate 211 is inclined so that the front side of the front portion 211A rises in the direction of the arrow R2 and the rear side of the rear portion 211B lies in the direction of the arrow R2 with the horizontal shaft 52 as a fulcrum while moving as a whole. Tilt like so. Moreover, since the long groove 541 is curved so as to draw a slightly convex arc toward the surface side of the back plate 16 that contacts the patient's back (upward in FIG. 12), the second arm 5 The other end 53 of FIG. 12 moves forward while drawing a slightly convex arc toward the top in FIG. As a result, the movement of the one end 41 of the first arm 4 obliquely upward and the movement of the one end 51 of the second arm 5 obliquely downward draw a slightly convex arc. FIG. 13 shows the movement trajectories of the support plate 211, the horizontal shaft 42, and the horizontal shaft 52 in the above operation.

  When the moving block 57 is moved to the front end, the state (C) is obtained, and when the moving block 57 is moved halfway, the state (B) is obtained. Note that the second arm 5 can be fixed at any position from (A) to (C) by operating the lock mechanism 6. That is, when the front end portion 612 of the lever 61 is moved outward, the claw portion 62 moves forward and engages with the concave portion 631, and the moving block 57 is fixed to the stopper portion 63. Fixed to.

  As can be seen from FIG. 13, the movement trajectory of the support plate 211, that is, the headrest 21, shows a very natural tilt in conjunction with the movement of the horizontal axes of the first arm 4 and the second arm 5, respectively. Therefore, according to the headrest device 2 configured as described above, natural tilting of the headrest 21 can be realized. In addition, according to natural tilting, the patient's head rotation can be realized while minimizing the burden on the patient's cervical spine during headrest adjustment. In this embodiment, when the patient's head rotates, the first arm 4, the second arm 5, and the horizontal so that the movement and rotation angle of the support plate 211 in the front-rear direction reproduces the natural movement of the patient cervical spine. The shaft 42 and the long groove 541 are configured to realize a natural tilt for the patient while linking movements to each other and determining the operation and the range of motion of each member. Also, according to the natural tilting, even when the patient's head rotates, the headrest is adjusted by moving only the angle without moving the position of the viewing part (oral cavity such as the occlusal surface of the tooth). The relative distance between the head and the surgeon can be maintained constant, and therefore, the movement of the headrest can be realized without the surgeon having to readjust the unnecessary posture. In the present embodiment, the back surface of the support plate 211 is horizontal so that the position of the temporomandibular joint J is constant no matter which position the patient's head placed on the support plate 211 rotates along the movement trajectory K. Since the movable areas of the shaft 42 and the horizontal shaft 52, the horizontal shaft 55 of the second arm, and the horizontal shaft 571 fixed to the moving block 57 are adjusted, it is natural for not only the patient but also the surgeon. Can be tilted.

  In the headrest device 2, the first arm 4 is located at the center in the width direction, and the second arm 5 is located on both sides in the width direction. And the second arm 5 do not hinder the movement of each other.

[Second Embodiment]
FIG. 14 is a front view of the main part of the headrest device 2 of the present embodiment, where (A) shows a state in which the support plate 211 is nearly horizontal, that is, a state when the headrest device 2 is extended, The state which the support plate 211 inclines, ie, the state at the time of shortening of the headrest apparatus 2, is shown. FIG. 15 is a schematic cross-sectional view taken along the line XV-XV in FIG.

  The headrest device 2 of this embodiment is different from the headrest device 2 of the first embodiment only in the connection structure of the first arm 4. That is, in the present embodiment, the one end 41 of the first arm 4 is fixed to the front part of the back surface of the support plate 211. Further, the other end 43 of the first arm 4 is rotatably connected to a horizontal shaft 44 of the wall portion 30 of the support portion 3, and the horizontal shaft 44 is a front-rear guide portion 46 formed on the wall portion 30. Are slidably provided. Specifically, as shown in FIG. 15, a horizontal shaft 44 passes through the other end 43 of the first arm 4, and the horizontal shaft 44 is fixed by a fixing member 431 such as a hexagon socket bolt, for example. It is fixed to the other end 43. The horizontal shaft 44 extends in the width direction. On the other hand, the front / rear guide portion 46 is formed by a long hole 461 formed in both wall portions 30 and extending in the front / rear direction. Both ends 441 of the horizontal shaft 44 are inserted into the long holes 461 of the both wall portions 30, so that the horizontal shaft 44 can slide in the front-rear direction along the front-rear guide portion 46. The long hole 461 is curved to draw a slightly convex arc toward the surface side of the back plate 16 that contacts the patient's back (upward in FIG. 14).

  Also in the headrest device 2 of the present embodiment, when the moving block 57 is moved forward, the second arm 5 is pulled forward by the extending portion 58, and the other end 53 moves forward along the inclined guide portion 54. To do. At this time, the first arm 4 rotates in the direction of arrow R2 around the horizontal axis 44 while the one end 41 moves forward, and the second arm 5 has one end 51 around the horizontal axis 52. To the direction of arrow R1. Thereby, the one end 41 of the first arm 4 moves obliquely upward and forward, and the one end 51 of the second arm 5 moves obliquely downward and forward. Therefore, the support plate 211 is inclined so that the front side of the front part 211A rises in the direction of the arrow R2 and the rear side of the rear part 211B lies in the direction of the arrow R2 with the horizontal shaft 52 as a fulcrum while the entire support plate 211 moves forward. Tilt like so. Moreover, the long groove 541 is curved so as to draw a slightly convex arc toward the surface of the back plate 16 that contacts the patient's back, and the long hole 461 is also formed on the surface of the back plate 16. Since the second arm 5 is curved so as to draw a slightly convex arc toward the side, the other end 53 of the second arm 5 moves forward while drawing a slightly convex arc toward the top in FIG. Moving. Accordingly, the movement of the one end 41 of the first arm 4 obliquely upward and the movement of the one end 51 of the second arm 5 obliquely downward draw a slightly convex arc toward the top. Therefore, also in the headrest device 2 of the present embodiment, the movement trajectories of the support plate 211, the horizontal shaft 44, and the horizontal shaft 52 are as shown in FIG. Note that the movement locus of the horizontal axis 42 in FIG. 13 is the movement locus of the horizontal axis 44 in the present embodiment.

  Therefore, also with the headrest device 2 of the present embodiment, natural tilting of the headrest 21 (illustrated in FIG. 2) can be realized as in the first embodiment.

  In the headrest device 2, the first arm 4 is located at the center in the width direction, and the second arm 5 is located on both sides in the width direction. And the second arm 5 do not hinder the movement of each other.

[Modified Configuration of Embodiment]
In the first and second embodiments, the following modified configuration can be adopted.
(A) The support plate 211 is coupled to the support portion 3 via the two first arms 4 and the one second arm 5. In this case, the first arm 4 is provided on both sides of the headrest device 2 in the width direction, and the second arm 5 is provided in the center of the headrest device 2 in the width direction. For example, FIG. 16 shows a modified configuration of the second embodiment. As shown in FIG. 16, the two first arms 4 are located on the outer side in the width direction of the wall portion 30 of the support portion 3 (not shown in FIG. 16). The horizontal shaft 44 is slidably positioned in the long hole 461 of the wall 30 while being fixed to the other end 43 of the first arm 4. The second arm 5 is located between both wall portions 30. Two inclined guide portions 54 are formed, and each of the inclined guide portions 54 is formed on the opposing inner surfaces of both wall portions 30. Both ends 552 of the horizontal shaft 55 are supported by bearings 56 that can slide in the inclined guide portion 54.

(B) The inclination guide part 54 consists of a long hole. In this case, for example, the connection structure of the first arm 4 in FIG. 16 is adopted as the connection structure of the second arm 5 in the first and second embodiments.

(C) The front / rear guide portion 46 is a long groove. In this case, for example, the connection structure of the second arm 5 in FIG. 16 is adopted as the connection structure of the first arm 4 in the second embodiment.

(D) A drive mechanism for moving the moving block in the front-rear direction is provided. When this drive mechanism is provided, the lock mechanism 6 is unnecessary. As the drive mechanism, for example, a mechanism including a motor M and a drive screw shaft N as shown in FIG. 14 can be used. One end of the drive screw shaft N is fixed to the output shaft P of the motor M via a coupling member C for connection, so that the drive screw shaft N rotates in conjunction with the rotation of the motor M. It has become. In this mechanism, the moving block 57A is screwed to the drive screw shaft N so as to be movable in the front-rear direction. Specifically, the front part of the drive screw shaft N is a thin cylindrical rod-like body, the rear part is a thick screw part, and the front end passes through the drive screw bearing W provided in the support part 3 to be connected. The rear end of the coupling member C is rotatably connected to the rear end of the support portion 3. The screw portion of the drive screw shaft N penetrates the moving block 57A in the front-rear direction, and the moving block 57A is screwed into the screw portion. In this mechanism, when the motor M rotates and the drive screw shaft N rotates together with the connecting coupling member C, the moving block 57A moves in the front-rear direction along the drive screw shaft N. At this time, the movement of the moving block 57A is restricted by the second arm 5 that is rotatably connected to the side surface of the moving block 57A via the tip portion 581 of the extending portion 58. Even if it rotates, the moving block 57A moves in the front-rear direction without rotating. In this mechanism, the drive screw shaft N is inserted into the drive screw bearing W provided in the support portion 3, and the outer diameter of the screw portion of the drive screw shaft N is the inner diameter of the insertion hole of the drive screw bearing W. Since it is larger, the drive screw bearing W supports the front end surface of the screw portion of the drive screw shaft N even when the weight of the headrest 21 (see FIG. 2) and the patient's head (not shown) is applied to the support plate 211. Thus, no load is applied to the coupling member C and the motor M that are connected to the drive screw shaft N. Therefore, according to this configuration, the strength of the headrest device can be maintained. According to this modified configuration, since the position of the moving block 57A in the front-rear direction can be set finely, the inclination of the headrest 21 can be set finely. In addition, the operation of such a drive mechanism is performed by an operation switch or foot switch provided in a part of a medical table or treatment table constituting the unit like a conventional general medical / dental medical unit. Can be done electrically. Needless to say, such a drive mechanism can also be applied to the first embodiment.

  In the headrest device of the present invention, (i) the length of each arm, (ii) the position of the shaft that is the operation center provided in the arm, (iii) the long groove or By changing the length of the long hole, the shape of the peripheral edge, and (iv) the movable range of the moving block, the moving amount, the turning range, the inclination angle, etc. of the headrest can be adjusted / changed.

  Since the headrest device of the present invention can realize natural tilting of the headrest, the industrial utility value is great.

    DESCRIPTION OF SYMBOLS 101 Medical table 16 Back plate 21 Headrest 3 Support part 4 1st arm 41 One end 43 Other end 44 1st horizontal axis 46 Front-back guide part 461 Long hole 5 2nd arm 51 One end 53 Other end 54 Inclination guide part 541 Long groove 55 2nd Horizontal axis 6 Lock mechanism

Claims (10)

In the headrest device used by being attached to the back plate so that the patient's head can be supported at the rear end of the back plate in the longitudinal direction of the medical / dental examination table,
A headrest to support the patient's head;
A support portion attached to the back plate to support the headrest behind the back plate;
With
The headrest is supported via the first arm so as to be rotatable about the first horizontal axis perpendicular to the front-rear direction with respect to the support part and so as to be movable in the front-rear direction. Are connected to
Furthermore, the headrest can move in the front-rear direction along the inclined direction that is lowered toward the front while rotating around the second horizontal axis perpendicular to the front-rear direction with respect to the support portion. Connected to the support through the second arm,
A headrest device. One end of the first arm is rotatably connected to the front portion of the headrest, and the other end of the first arm is rotatably connected to the first horizontal axis of the support portion.
One end of the second arm is rotatably connected to the back surface of the headrest behind the one end of the first arm, and the other end of the second arm is connected to the tilt direction via the second horizontal axis. The inclined guide portion formed along the slidably provided,
The headrest device according to claim 1. One end of the first arm is fixed to the front part of the headrest, and the other end of the first arm is rotatably connected to the first horizontal axis of the support part and is formed in the front-rear direction on the support part. The slidable front and rear guide part is slidably provided,
One end of the second arm is rotatably connected to the back surface of the headrest behind the one end of the first arm, and the other end of the second arm is connected to the tilt direction via the second horizontal axis. The inclined guide portion formed along the slidably provided,
The headrest device according to claim 1. The support portion includes a drive mechanism that moves the second arm in the front-rear direction.
The headrest device according to any one of claims 1 to 3. The support portion includes a lock mechanism for fixing the second arm at a predetermined position in the front-rear direction.
The headrest device according to any one of claims 1 to 3. The inclined guide part is curved so as to draw a convex arc toward the surface side of the back plate,
The headrest device according to any one of claims 2 to 5. The front and rear guide portions are curved to draw a convex arc toward the surface side of the back plate,
The headrest device according to any one of claims 3 to 5. The inclined guide part consists of a long groove or a long hole,
The headrest device according to any one of claims 2 to 6. The front and rear guide part consists of a long hole or a long groove,
The headrest device according to any one of claims 3, 4, 5, and 7.   A medical / dental examination table, wherein the headrest device according to any one of claims 1 to 9 is attached to the back plate so as to support the headrest behind the back plate.

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