JPH064490Y2 - Dental light arm - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to improvement of a light arm used for dental treatment.

(Prior Art) In dental treatment, it is often necessary to change the irradiation angle of the light with respect to the oral cavity of the patient lying on the treatment table according to the treatment mode and the treatment site during the dental treatment. Also, while the patient must be positioned above the patient during treatment, it is also necessary to save the patient in a position that does not interfere with getting on and off the treatment table. Therefore, the mechanism of a general dental light arm is a hanger arm that can extend horizontally and vertically swingable from a ceiling, a wall surface, or a column, and that can pivot at the tip of the support arm and can swing horizontally. To connect
Further, the lamp head is attached to the tip of the hanger arm so as to be swingable. In particular, the axis-rotating function of the hanger arm is important for accurate positioning of the radiation field and is most often used by the operating surgeon. For this reason, it is necessary to easily perform a rotating operation and surely maintain the stationary position at a set position, and as a function that has such a function, for example, there is a hanger arm mechanism disclosed in Japanese Utility Model Publication No. 63-21860. I can. In this hanger arm mechanism, a spring is fitted around the outer circumference of a rotary support shaft having a lamp head attached at its tip, and the restoring elastic force of the spring causes the flange portion of the base end portion of the rotary support shaft and the flange portion of the hanger arm body to come together. Axial direction (thrust direction)
A pressure contact is tightly made along with, and the frictional force caused by the tightness causes the rotary support shaft to rotate and stand still at an arbitrary position.

(Problems to be solved by the invention) However, in the hanger arm mechanism according to the above-mentioned prior application, the rotation support shaft and the main body are made to rotate and stand by the pressure contact friction resistance in the thrust direction between the flange portions of the main body. Since the effective friction area is small, the static stability is still difficult, and the spring elastic force is directly applied to the flange, so the jerk of the spring is transmitted between the flanges. However, this has a drawback that the so-called inching operation cannot be performed smoothly. Furthermore, if an external force is applied to the support shaft along the axial direction to the support shaft, the pressure contact may loosen and the rotation angle of the support shaft may suddenly change when the treatment arm is hit. There was time.

The present invention has been made in view of the above, and an object of the present invention is to provide a novel dental light arm having a hanger arm mechanism that is excellent in stationary stability and that can be smoothly rotated.

(Means for Solving the Problems) The structure of the present invention for achieving the above object will be described with reference to the accompanying drawings. 1 is a partial cutaway side view showing an example of a dental light arm of the present invention, FIG. 2 is an enlarged vertical sectional view of line II of FIG. 1, and FIG. 3 is a sectional view taken along line III-III of FIG. , FIG. 4 is a view similar to FIG. 2 of another embodiment.

That is, the dental light arm of the present invention has a horizontal swing and / or
Alternatively, a dental light arm including a support arm 1 having a vertical swing mechanism, a hanger arm 2 connected to the tip of the support arm 1, and a lamp head 3 attached to the tip of the hanger arm 2 is provided. The hanger arm 2 has a cylindrical cover 4 connected to the tip of the support arm 1 and a rotary support shaft 5 that is axially rotatably inserted into the cover 4 and has the lamp head 3 attached to the tip. And a connecting member 6 for connecting the rotary support shaft 5 and the cover 4 so as to allow the rotary support shaft 5 to rotate but prevent the rotary support shaft 5 from coming off the cover 4, and an inner surface of the cover 4. And rotation spindle 5
A sleeve 7 interposed between the outer surface of the rotary support shaft 5 and the outer surface of the rotary support shaft 5, and a round nut 81 and a round nut 81 screwed on the outer periphery of the rotary support shaft 5 so as to advance and retract in the axial direction. It is elastically mounted between the round nut 81 and the sleeve 7 by screwing through the main body of 81 to integrally fix it to the rotary shaft 5, and biases the sleeve 7 in the sliding direction of the tapered surface. Rotational stationary means 8 including elastic biasing means 82, 83
It is characterized by consisting of and.

The support arm 1 is connected to a horizontal swivel arm 11 that is horizontally swivelable on a pillar or the like that stands upright on a wall surface, a ceiling surface, or near a treatment table, and is vertically movably connected to the tip of the horizontal swivel arm 11. The hanger arm 2 is preferably composed of a vertically movable arm 12, and the hanger arm 2 is connected to the tip of the vertically movable arm 12 by the cylindrical cover 4 so that the hanger arm 2 can be swung to the left and right. Instead, it can be appropriately changed according to the conditions such as the installation location.

(Operation) In the dental light arm having the above-described configuration, since the rotation support shaft 5 is axially rotatable by the connecting member 6 and fixed to the cover 4 so as not to slip out, the tip of the rotation support shaft 5 is engaged. The angle of the lamp head 3 attached to the can be manually changed. Moreover, the sleeve 7 elastically biased by the elastic force of the elastic biasing means 82 and 83 of the rotation stationary means 8 is interposed between the outer surface of the rotary support shaft 5 and the inner surface of the cover 4, and the taper surface thereof is pressure-contacted. Due to the reaction force, a frictional resistance holding force is generated between the facing surfaces of the cover 4 and the rotary support shaft 5 via the sleeve 7. Therefore, when the lamp head 3 is manually changed to an arbitrary angle as described above and then released, Due to this frictional resistance holding force, the rotary support shaft 5 is stably held in balance at its set position. In particular, since the frictional resistance holding force is generated by the pressure contact between the radial surfaces of the cover 4 and the rotary support shaft 5, the pressure contact area is large, and since the sleeve 7 is interposed, the inner and outer double pressure contact surfaces are substantially formed. As a result, the holding stability becomes extremely excellent. Further, since the elastic urging force of the rotation stationary means 8 is converted to the radial direction by the sleeve 7, the jerky movement of the elastic urging means (wave washer 82 and spring 83 described later) is offset, and the rotation stationary means 8 round nuts 8
By adjusting the rotation of No. 1, the elastic force of the elastic urging means can be made variable, and even if the elastic force of the elastic urging means changes over time or deteriorates, the round nut 81 always performs a manual angle changing operation. Since the elastic force can be adjusted to the optimum value, the inching operation of the lamp head 3 becomes easy, and a smooth angle changing operation is guaranteed.

(Example) Next, an example will be described. FIG. 1 is an overall view of the lamp head of the present invention, and the support arm 1 is composed of the horizontal swing arm 11 and the vertically movable arm 12 as described above. The horizontal swivel arm 11 is attached to a wall surface, a ceiling surface, a column, or the like so as to be stationary at an arbitrary swivel angle.
Is connected to the tip of the revolving arm 11 at its base end so as to be stationary at any vertical angle. Conventionally known stationary means for these arbitrary angles are adopted, and therefore a detailed description thereof will be omitted here.

A hanger arm 2 as described below is connected to the tip of the vertically movable arm 12, and a dental lamp head 3 is swingably attached to the tip of the hanger arm 2 via a second hanger arm 20. In this embodiment, the second hanger arm 20 is included to form the hanger arm 2, but a case where the lamp head 3 is directly attached without the second hanger arm 20 is not excluded.

In FIGS. 1 and 2, a receiving member 40 is fixed to the base end portion of the cover 4, and the receiving member 40 and the tip end of the vertically movable arm 12 have a pivot shaft 41 common to them. The cover 4 is attached so that the cover 4 can turn left and right about the axis of the pivot 41. The tip side of the receiving member 40 has a two-step cylindrical shape having an inner diameter of a small diameter portion 401 and a large diameter portion 402, and the small diameter portion 401 is the rotation support shaft 5
The base end portion 51 of the above can be received. As shown in FIG. 3, an arc-shaped peripheral groove 52 is formed in a part of the peripheral body of the base end portion 51, and the stopper screw (connecting member) 6 screwed in the radial direction from the outer periphery of the small diameter portion 401. The tip end is fitted into this circumferential groove 52, whereby the rotary support shaft 5 is fixed to the cover 4
On the other hand, although the shafts are allowed to rotate between strokes of the circumferential groove 52, they are connected in a state in which they cannot be pulled out in the axial direction.

A peripheral surface portion of the rotation support shaft 5 adjacent to the base end portion 51 is a taper portion 53 having a tapered diameter on the front side, and the taper portion 53 is in a state where the cover 4 and the rotation support shaft 5 are connected to each other. The inner surface of the large diameter portion 402 is opposed to the inner surface with a gap. The sleeve 7 is a short tubular body whose inner surface 71 is tapered so as to correspond to the tapered portion 53, is inserted from the tip of the rotary support shaft 5, and has a gap between the large diameter portion 402 and the tapered portion 53. Is installed in the. A plurality of slits 72 along the axial direction are provided in the sleeve 7 from the tip end portion in the circumferential direction, and a wave washer 82 is attached to the rear end portion of the sleeve 7 in an abutting state on the rotary spindle 5. There is. This wave washer 82 is followed by a round nut 81
Is screwed around the circumference of the rotary support shaft 5, and when the round nut 81 is tightened, the restoring elasticity of the wave washer 82 is increased.
The sleeve 7 is added to the rear end of the large-diameter portion 402 and the tapered portion 53. The sleeve 7 is pressed between the large-diameter portion 402 and the tapered portion 53. Friction resistance is generated via 7, and mutual holding force is generated between the two. Therefore, by changing the tightening force of the round nut 81, the wave washer 82
The restoring resilience is changed, and as a result, the frictional resistance holding force can be changed arbitrarily, and proper adjustment of the stationary state can be achieved. When the slit 72 is formed, the cylinder wall portion is expanded by the addition of the elasticity, and the frictional resistance force is generated more effectively. Reference numeral 811 is a rotation stop screw which is threaded through the main body of the round nut 81 and fixes the round nut 81 to the rotation support shaft in order to fix the round nut 81 at an appropriate position.

In the embodiment shown in FIG. 4, a compression spring 83 is elastically mounted between the round screw 81 and the sleeve 7 in place of the wave washer 82. Therefore, by changing the tightening force of the round screw 81, the frictional resistance holding force via the sleeve 7 of the cover 4 and the rotary support shaft 5 is changed, and the proper rotation of the rotary support shaft 5 is performed according to this frictional resistance holding force. It is possible to stand still. Other configurations are similar to those described above, and thus detailed description thereof will be omitted here.

In the above embodiment, the inner surface of the sleeve 7 is tapered, and the above-mentioned rotational stationary is achieved by the pressure contact action with the taper portion 53 formed on the peripheral surface of the rotary support shaft 5. It is also possible to taper the outer surface and make the inner surface of the large-diameter portion 402 of the receiving metal 40 function as a taper portion corresponding to the same function. 40, money received
Is fixed to the cover 4 so that the rotating and stationary function is exhibited in the receiving metal 40, but the same function is obtained between the cover 4 and the rotary support shaft 5 without the receiving metal 40. It is also possible to do so.

(Effect of the Invention) As described above, in the dental light arm of the present invention,
The lamp head 3 attached to the rotary support shaft 5 and the tip thereof by the frictional resistance holding force on the radial surface due to the mutual taper pressure contact between the inner surface of the cover 4 of the sleeve 7 and the outer surface of the rotary support shaft 5 which are elastically biased. Since the rotation and stationary are performed, its holding force is large and stable stationary is promised. Further, since the urging elastic force along the axial direction of the rotation stationary means 8 is converted to the radial direction by the sleeve 7,
The jerky movements of the elastic biasing means such as the web washers and springs are offset, and the highly accurate inching operation becomes easy. Further, since the rotation support shaft 5 is inserted into the cover 4 and is allowed to rotate, a smooth angle change can be achieved only by manually operating the lamp head 3. Although the rotation support shaft 5 is allowed to rotate by the connecting member 6 but is not allowed to move in the axial direction, the rotation support shaft 5 can rotate only by an external force applied in the same direction. Absent. In addition, since the number of parts is small and the structure is simple, it also contributes to weight reduction and cost reduction.

[Brief description of drawings]

FIG. 1 is a partial cutaway side view showing an example of a dental light arm of the present invention, and FIG. 2 is an enlarged vertical sectional view taken along line II of FIG.
FIG. 3 is a sectional view taken along the line III-III in FIG. 2, and FIG. 4 is a view similar to FIG. 2 of another embodiment. (Explanation of reference numerals) 1 ... Support arm, 2 ... Hanger arm, 3 ... Lamp head, 4 ... Cylindrical cover, 5 ... Rotating support shaft, 6 ... Connecting member, 7
... Sleeve, 8 ... Rotating and stationary means.

Claims (1)

[Scope of utility model registration request] 1. A support arm (1) having a horizontal turning and / or vertical swinging mechanism, a hanger arm (2) connected to the tip of the support arm (1), and a hanger arm (2). In a dental light arm consisting of a lamp head (3) attached to the tip, the hanger arm (2), a cylindrical cover (4) connected to the tip of the support arm (1), The rotation support shaft (5) having the lamp head (3) attached at the tip thereof is inserted through the cover (4) so as to be rotatable, and the cover (4) allows the shaft rotation of the rotation support shaft (5). A connecting member (6) for connecting the rotation support shaft (5) and the cover (4) so as to prevent the rotation support shaft (5) from coming off with respect to 4),
A sleeve (7) interposed between the inner surface of the cover (4) and the outer surface of the rotation support shaft (5) so as to be in sliding contact with one of the surfaces by taper, and on the outer circumference of the rotation support shaft (5). The round nut (81) and the round nut (81) screwed so as to move back and forth in the axial direction
Rotation stop screw (811) integrally fixed to (5) and the round nut
The sleeve (7) is mounted between the (81) and the sleeve (7).
Elastic biasing means to bias the taper surface in the sliding direction (82) (83)
A dental light arm, comprising: a rotating stationary means (8) including a.