JPH0522718Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[0001]

TECHNICAL FIELD The present invention relates to a stopper mechanism for fixing a parallel link arm at a desired swing angle.

[0002]

BACKGROUND OF THE INVENTION Parallel link arms with weight balancing means are utilized to move equipment to a desired position in three-dimensional space and hold it there. This type of arm is used as a stand for a surgical microscope,
This can be seen in the support frame of an X-ray machine or the support arm of an optometry unit.

[0003] The parallel link arm has a built-in stopper mechanism for fixing the swinging of the arm at a desired swinging angle position. 1
A common method is to provide a tension screw on the arm and prevent the arm from swinging around the fulcrum by tightening the tension screw.

[0004]

[Problems to be Solved by the Invention] However, the above-described conventional stopper mechanism has a drawback in that the tightening force is weak because the tightening force acts only from one direction. Another problem is that the appearance is not good.

[0005] The present invention eliminates the conventional drawbacks,
To provide a stopper mechanism with good appearance and large tensioning force.

[0006]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the stopper mechanism for the parallel link arm according to the present invention has the following features on either the upper arm piece or the lower arm piece that constitutes the parallel link mechanism: A brake plate in which a slot is formed is provided parallel to the swinging surfaces of the two arms, and on the other hand, a first flexi-yu, in which a screw hole is bored in the normal direction of the brake plate, is provided in the normal direction. The upper arm piece and the lower arm piece each have a pair of side walls that cooperate to hide the brake plate from both sides thereof. and a tensioning screw with a tensioning handle at one end.
A second brake shoe interposed between the handle portion and the brake plate passes through the slot and is screwed into the screw hole, and the second brake shoe passes through a side wall of the other arm piece. and facing the brake plate.

[0007]

[Operation] Since the present invention has the above-described configuration, by rotating the tensioning handle, the first brake shoe that is threaded into the tensioning screw comes into contact with one side of the brake plate, and then the tensioning The second brake shoe pressed by the constant handle comes into contact with the other surface of the brake plate, and both brake shoes sandwich the brake plate from both sides and fix the upper arm piece and the lower arm piece, and the parallel link arm Prevents the vibration of the

[0008] Furthermore, the brake plate is hidden by the side wall of the upper arm piece and the side wall of the lower arm piece, so it is not visible from the outside and has a good appearance.

[0009]

[Example] This invention will be explained below based on the drawings. 1 to 3 show an embodiment of this invention.

[0010] As shown in FIG. 1, the parallel link arm 1
0 has a first bearing member 11 attached to a vertical axis 2 protruding from a support 1 attached to a wall or a pedestal so as to be rotatable around the vertical axis 2,
One end of an upper arm piece 12 is swingably connected to a support shaft 11a provided on the bearing member, and one end of a lower arm piece 13 is swingably connected to a support shaft 11b.

[0011] The other end of the upper arm piece 12 is swingably connected to a support shaft 14a of the second bearing member 14, and the other end of the lower arm piece 13 is swingably connected to a support shaft 14b. The second bearing member 14 is a rotatable vertical shaft 3
A supported device 4 such as a surgical microscope is attached to the lower end of this vertical shaft 3.

[0012] These first and second bearing members 11, 14
A parallel link mechanism is constituted by the upper and lower arm pieces 12 and 13, and thus the parallel link arm 10 can move up and down without tilting the supported device 4. Note that a spring means 15 such as a gas spring is installed between the support shaft 11b and the support shaft 14a in order to balance the weight of the supported device 4. The upper arm piece 12 has a pair of side walls 12
a, 12b. The lower arm piece 13 has a pair of side walls 13a and 13b.

[0013] On the side wall 12a of the upper arm piece 12,
A brake plate 21 of the stopper mechanism 20 is fixed in parallel to the swinging surfaces of the upper arm piece 12 and the lower arm piece 13. The brake plate 21 has an arc-shaped slot 2 whose center portion is close to the lower arm piece 13.
2 is formed, and this slot 22 is connected to a tightening screw 23.
is penetrated. The brake plate 21 is attached to the side walls 12a, 12 of the upper arm piece 12 so as not to be visible from the outside.
b and the side walls 13a, 13b of the lower arm piece 13 so as not to be visible from the outside.

[0014] On the inner wall surface of the lower arm piece 13, as shown in FIG.
As shown in , a cylindrical holding shaft 30 is fixed,
A pin 31 is implanted on the tip side thereof. The tip of the holding shaft 30 is connected to the cylindrical first brake shoe 2.
4, and the pin 31 is inserted into notches 24a and 24b formed in the axial direction of the first brake shoe 24.
With such a structure, the first brake shoe 24
is freely displaceable in its axial direction, and its rotation around the axis is restricted by the contact between the pin 31 and the notches 24a, 24b. A screw hole 24d is bored in the first brake shoe 24 in the normal direction of the brake plate 21, and its contact surface 24c faces the inner wall surface 21a of the brake plate 21.

[0015] A circular opening 32 facing the slot 22 of the brake plate 21 is bored in the side wall 13a of the lower arm 13, and the stepped inner shaft 25b of the second brake shoe 25 is inserted into the circular opening 32. is rotatably inserted. The contact surface 25a of the second brake shoe 25 faces the outer wall surface 21b of the brake plate 21.

[0016] The tightening screw 23 is a flat washer 42,
Penetrates through the through hole 25d of the second brake shoe 25 and the slot 22 via the spring washer 43,
It is screwed into a screw hole 24d of the first brake shoe 24. The tension screw 23 has a tension handle 4 at one end.
0 is provided, and is rotated by operating this tension handle 40.

[0017] Next, the stopper mechanism 20 having such a configuration
Explain the effect of

[0018] After setting the parallel link arm 10 to a desired swing angle position, the tension handle 40 is operated to tighten the tension screw 23. Since the rotation of the first brake shoe 24 in its axial direction is restricted by the pin 31, the tightening screw 23 is screwed in the axial direction to move the first brake shoe 24 toward the brake plate 21 side. attract. At the same time, the tension handle 40 is also displaced toward the brake plate 21 side. The root portion 41 of the tensioning handle 40 includes a flat washer 42,
The second brake shoe 25 is pressed toward the brake plate 21 via the spring washer 43.

[0019] Then, the first and second brake shoes 2
After either one of the brake shoes 4 and 25 comes into contact with one side of the brake plate 21 first, the other brake shoe comes into contact with the other side of the brake plate 21, and when the tightening screw 23 is further tightened, the first and second brake shoes 2 brake show 2
4 and 25 pinch the brake plate 21 from both sides. The brake plate 21 is fixed to the lower arm piece 13 by the clamping force of these first and second brake shoes 24 and 25, and the parallel link arm 1
0 is fixed at a desired swing angle position.

【0020】

[Effect] As explained above, according to the present invention, since the brake plate is sandwiched from both sides by the first and second brake shoes, the swinging prevention force of the parallel link arm is increased.

[0021] Furthermore, since the first brake shoe and the second brake shoe are configured such that the brake shoe itself is displaced with respect to the surface of the brake plate, the brake plate may not be deformed due to tightening of the brake shoe. do not have.

[0022] Furthermore, since the brake plate is hidden by the pair of side walls of the upper arm piece and the pair of side walls of the lower arm piece, the appearance is good.

[Brief explanation of the drawing]

FIG. 1 is a partially longitudinal cross-sectional view showing the configuration of a parallel link arm according to the present invention.

FIG. 2 is a sectional view taken along the line -- in FIG. 1 showing the stopper mechanism.

FIG. 3 is a sectional view taken along the line -- in FIG. 2, showing the relationship between the pin and the notch of the first brake shoe.

[Explanation of symbols] 10...Parallel link arm 12... Upper arm piece 12a, 12b...side wall 13...Lower arm piece 13a, 13b...side wall 21...brake plate 22...Slot 23...Tightening screw 24...1st brake shoe 25...Second brake shoe 30...Holding shaft 31...pin 40...Tension handle.

Claims (1)

[Scope of utility model registration request] [Claim 1] A brake plate in which a slot is formed is provided on either one of the upper arm piece and the lower arm piece constituting the parallel link mechanism, parallel to the swinging surfaces of the two arms, and on the other side. A first brake shoe having a screw hole bored in the normal direction of the brake plate is provided such that it can be freely displaced in the normal direction and rotation around the screw hole is restricted; The upper arm piece and the lower arm piece each have a pair of side walls that cooperate to conceal the brake plate from both sides thereof, and a tensioning screw having a tensioning handle at one end thereof is provided.
A second brake shoe interposed between the handle portion and the brake plate passes through the slot and is screwed into the screw hole, and the second brake shoe passes through a side wall of the other arm piece. A stopper mechanism of a parallel link arm, characterized in that the parallel link arm faces the brake plate.