JPH0331855Y2 - - Google Patents

Description

[Detailed description of the invention] A. Field of industrial application The invention provides an arm that is rotatably attached to a shaft that is erected from the main body, and can easily adjust the angle at which it is attached to the main body. This invention relates to a horizontal swing arm mechanism that can be fixed to the main body.

B. Prior Art A horizontal swing arm mechanism that can change the attachment (rotation) angle of an arm rotatably attached to a shaft that is planted from the main body with respect to the main body is used, for example, in a lower limb traction device for an operating table. . The lower limb traction device includes, for example, two arms A and B that are rotatably stacked and fitted on a shaft that is planted from the main body.
The opening angle of arms A and B and the relative angle with the main body are adjusted very delicately in relation to the surgical site of the patient and the position of the holding arm of the X-ray device for photographing the affected area. Both arms must be fixed to the main body in the correct position.

A conventional horizontal swing arm mechanism will be described using a lower limb traction device as an example with reference to FIGS. 3 to 5.

FIG. 3 shows a state in which arms A and B set at predetermined angles are fastened and fixed to the main body 2 by the handle 1. FIG. 4 shows a state in which the handle 1 is loosened in order to adjust the opening of arms A and B and the relative angle with the main body 2.

In the locking portion 3 between arm A and arm B and the locking portion 4 between arm A and main body 2, a locking portion extending radially from the center is provided on the contact surface of each member as shown in FIG. A pair of jagged teeth 5 are carved, and a joint is formed by the pair of jagged teeth.

As shown in FIG. 3, when the joint is tightened, the jagged teeth 5 of the locking parts 3 and 4 mesh with each other, and the rotation of arms A and B is restricted, so that each arm It is fixed to the main body 2 at a predetermined opening angle. To change the opening angle of arms A and B and the relative angle with the main body 2, loosen the handle 1 as shown in FIG. 4, and release the engagement of the jagged teeth 5 of the locking parts 3 and 4. Then, arm A and arm B may be rotated and set at a predetermined angle.

C Problem to be solved by the invention However, as is clear from Figure 4, when the handle 1 is turned to loosen the tightening, arms A and B lose their own weight and the weight of the object placed on them. As a result, the serrated teeth 5 of each locking portion 3, 4 partially interfere with each other, making it difficult to rotate each arm A, B.

In particular, when this type of horizontal swing arm mechanism is applied to the lower extremity traction device for the operating table mentioned above, the opening angles of arms A and B are set very delicately, and the patient is placed on the operating table. The opening angle had to be adjusted, and the unbalanced loads on the bearings of arms A and B were large, requiring a large force to adjust the angle.

In order to rotate arms A and B, it is necessary to lift them horizontally against an unbalanced load and to a position where the jagged teeth do not mesh.Also, when fixing arms A and B after setting their angles, it is necessary to lift them horizontally against an unbalanced load. Unless the handle 1 is tightened while the arms A and B are lifted horizontally, the jagged teeth 5 cannot be completely engaged, and in either case, a great deal of effort is required by the operator.

Furthermore, a large clamping force is required to ensure the engagement of the jagged teeth 5 against the unbalanced load acting on the arms without lifting the arms A and B horizontally. , the problem of interference with other peripheral devices occurs.

The purpose of this invention is to solve the above problems.
To provide a horizontal swing arm mechanism in which, when a locking part is released from engagement, an arm moves upward with respect to a main body to horizontally support the locking part in a completely separated state.

D Means for Solving the Problems The present invention rotatably fits at least one arm to a shaft member implanted in the main body, and tightens the arm to the main body via the shaft member, thereby tightening the main body and the arm. A horizontal swing arm mechanism in which the arm is fixed to the main body by meshing locking portions made of jagged teeth formed on each opposing surface of the horizontal swing arm mechanism, which is characterized in that it is configured as follows.

That is, the shaft member is attached to the main body so as to be movable up and down in the longitudinal direction thereof, and the shaft member is configured to be moved upward by the operating section when the engagement of the locking portion is released.

The shaft member is formed with a flat surface that engages with and supports the arm when it moves upward, and the arm is lifted by this flat surface and the engaging portion is released. .

E Effect When the shaft member is moved upward by operating the operating section,
The arm floats upward on the flat surface formed on the shaft member, the locking portion is released, and the arm is supported horizontally on the flat surface, so that the load of the arm is not applied to the locking portion.

The arm, which is supported on a flat surface, can be rotated with a small amount of force, allowing the angle of attachment (rotation) to the main body to be finely adjusted.

After adjusting the angle, the shaft member is moved in the opposite direction (downward) using the operating section to engage and tighten the locking section.

At this time, the arm moves downward while being supported horizontally on a flat surface and no load is applied to the locking part, so the locking part can be reliably engaged with a small tightening force and the arm can be fixed to the main body. .

F Example - First Example - Hereinafter, an example in which the present invention is applied to a lower limb traction device for an operating table equipped with two arms will be described in detail.

In FIG. 1, lower limb traction arms A, B and an interlimb support 11 are attached to the operating table main body 0.

A shaft holder 12 is held at the distal end portion 10a of the operating table main body 10. The holder 12 has a cylindrical shape, and has a right-handed internal thread 12a carved on its lower inner peripheral surface, and jagged teeth 12b carved on its upper end surface. Here, the jagged teeth are a plurality of teeth 5 extending radially as shown in FIG. 5, as described above.

The right female thread 12a of the holder 12 has an operating section 13.
A socket bolt 13b having a left-hand thread is secured to the base 13a, and an operating handle 13c is attached to the base 13a. A shaft 14 is screwed onto the socket bolt 13b.

A bearing portion 16 of the arm A is fitted into the shaft 14, and jagged teeth 16a that mesh with the jagged teeth 12b of the holder 12 are carved along the periphery of the lower surface of the bearing portion 16. The upper surface of the bearing part 16 is a flat surface, and like the arm A, the shaft 14
It is in contact with the flat surface which is the lower surface of the bearing part 18 of the arm B which is fitted into the arm B. The upper surface of the bearing portion 18 of the arm B is engraved with jagged teeth 18a along its periphery.

A jagged tooth 20 meshing with the jagged tooth 18a of arm B
Holder 20 with a engraved along the periphery of the bottom surface
is fitted to the top of the shaft 14, and the pin 22
Rotation relative to the shaft 14 is prohibited. The interlimb support 11 is connected to the holder 20.

Here, the arm A, the arm B, and the holder 20 are sequentially fitted onto the shaft 14. To explain the shaft 14 in detail, a key groove 14c is formed on the lower circumferential surface of the shaft 14 and the inner circumferential surface of the holder 12. The key 24 is engraved and driven in, thereby inhibiting rotation of the shaft 14. Also,
The shaft 14 has stepped parts 14a and 14b, and when the operation handle base 13a is moved sufficiently downward, that is, each of the jagged teeth 12b, 16a, 18
a, 20a are in mesh with each other (first
In the figure), the stepped part 14a and the bearing part 16 of arm A are shown.
There is a gap between the holder 20 and the stepped part 14b.
comes into contact. In addition, the above-mentioned gap is the jagged tooth 5 (fifth
It is set larger than the height of the mountain in the figure).

The operation of this embodiment will be explained in detail below.

When the handle 13c is turned in the direction of arrow A in FIG. 1, both the base 13a and the socket bolt 13b rotate in that direction. As mentioned above, the base 13a
is a right-handed thread, and the socket bolt 13b is a left-handed thread, so when the handle 13c is turned in the direction of the arrow A, that is, in the direction of right-handed thread movement, the shaft 14 will be moved to the key 24.
The rotation is restricted by this, and it moves upward so as to be removed from the socket bolt 13b.

Here, since the stepped portion 14b of the shaft 14 is in contact with the holder 20, when the shaft 14 moves upward, the holder 20 also moves upward, thereby causing the jagged teeth 18a of the arm B and the holder 20 to move upward.
The meshing with the jagged teeth 20a is released. At this time,
Since arm B is in contact with arm A on a flat surface, it can freely and smoothly rotate around shaft 14.

Then, continue to move the handle 13c in the direction of the arrow A.
When the shaft 14 is turned upward and the shaft 14 is slid upward, the stepped portion 14a comes into contact with the bearing portion 16 of the arm A, and the arm A is lifted up. The bearing part 16 of the arm A is the stepped part 14a of the shaft 14.
When lifted by the arm A, the jagged teeth 16
a is disengaged from the jagged teeth 12b of the holder 12, and since the arm A is supported horizontally floating on the flat surface of the stepped portion 14a, the rotation of the arm A is free and unrestricted by any member. will be carried out smoothly.

Next, a case will be described in which arm A and arm B are set at desired angles.

First, arm A and arm B, which are in a free state, are rotated to a desired angle to determine the angle.
Next, turn the handle 13c in the direction of arrow B in FIG. With this operation, the base 13a is attached to the holder 12.
The socket bolt 13b, which rotates together with the base 13a, moves in the direction of coming out of the shaft 1.
As a result, the shaft 14, whose rotation is restricted, moves downward. Therefore, the arm A supported on the stepped portion 14a moves downward under its own weight together with the shaft 14, and the holder 20 connected to the shaft 14 by the pin 22 also moves downward.

As described above, when the arm A moves downward under its own weight, the jagged teeth 16 of the bearing portion 16 of the arm A first move.
a and the jagged teeth 12b of the holder 12 mesh with each other. In this state, arm A is not completely fixed in rotation with respect to main body 10. Continue with handle 13c
When turned in the same direction, the shaft 14 moves further downward, and the holder 20 moves further downward, causing the jagged teeth 20a of the holder 20 and the jagged teeth 1 of the arm B to move further downward.
8a meshes. In this state, if the handle 13c is strongly turned to urge the holder 20 downward and the meshing state of each tooth is tightened, the opening angles of the arms A and B are reliably set and are fixed to the main body 2. That will happen.

-Second Embodiment- Next, a second embodiment of the present invention will be described with reference to FIG. Components similar to those in FIG. 1 are designated by the same reference numerals and their explanations will be omitted.

In the first embodiment, the arm B meshes with the holder 20 on the upper surface side of the bearing portion 18, but
In this embodiment, the lower surface of the bearing portion 18 of the arm B is provided with jagged teeth 18a, and the jagged teeth 18a are provided on the lower surface of the bearing portion 18 of the arm B.
A jagged tooth 16b is provided on the upper surface of the bearing portion 16 of the arm A so as to mesh with the tooth a.

Then, with arms A and B completely tightened, the stepped portion 14b of the shaft 14 is brought into contact with the bottom surface of the bearing portion 18 of arm B, and the stepped portion 14a
A gap is provided between the shaft 14 and the bottom surface of the bearing portion 16 of the arm A. In addition, in this embodiment, a washer-like stopper 26 is provided at the top of the shaft 14.
is connected to the pin. The other members are exactly the same as those in FIG.

In this embodiment, the shaft 14 is slid upward by operating the handle 13c, first moving the arm B upward to disengage it from the arm A, and then moving the arm A upward together with the arm B to disengage the arm A. and the holder 12 are disengaged. This allows arm A and arm B to rotate freely.

After arm A and arm B are set at a predetermined angle, the shaft 14 is moved downward by operating the handle 13c, first, arm A and holder 12 are engaged, and then arm A and arm B are engaged. , further turn the handle to securely fix the angular positions of arms A and B.

In the above two embodiments, the case where there are two arms has been described, but the present invention can be similarly applied to cases where there is only one arm or three or more arms. In addition, this product is suitable not only for operating tables but also for any device in which a horizontal swing arm is rotatably attached to a shaft that is erected from the main body, and the angle at which the arm is attached to the main body needs to be delicately adjusted. Applying the idea is extremely effective.

G. Effect of the invention As explained above, according to the invention, when the arm is loosened from the main body, the locking parts consisting of the jagged teeth for adjusting the angle that were in mesh with each other are completely separated, and the arm is loosened. Since the arm is floating and supported horizontally to the main body on the flat surface of the shaft member, the rotation of the arm becomes extremely smooth, allowing the arm to be rotated with a small amount of force. can be fixed to.

[Brief explanation of drawings]

Fig. 1 shows a first embodiment of the present invention, and is a sectional view showing the case where it is used as a lower limb traction device on an operating table. Fig. 2 is a sectional view showing the second embodiment of the invention.
4 is a diagram showing a conventional horizontal swing arm in a fixed state, FIG. 4 is a diagram showing a state in which the arm shown in FIG. 3 is loosened, and FIG. 5 is a perspective view showing an example of a jagged tooth. 10: Operating table body, 12: Holder, 12b:
Jagged teeth (locking part), 13: Operating part, 14: Shaft (shaft member), 14a, 14b: Stepped part (release part), 16, 18: Bearing part, 16a, 18a: Jagged teeth (locking part) ), 20: holder, 20a: jagged teeth (locking part), A, B: arm.

Claims (1)

[Claims for Utility Model Registration] At least one arm is rotatably fitted to a shaft member that is planted from the main body, and the arm is tightened to the main body via the shaft member. The arm is fixed to the main body by engaging locking portions made of jagged teeth formed on opposing surfaces of each of the two, wherein the shaft member has a flat surface that engages with the arm and supports them. the shaft member is arranged to be movable up and down in the longitudinal direction of the main body, and an operating section for moving the shaft member upward when the engagement of the locking portion is released; 1. A horizontal swing arm mechanism, characterized in that by moving the shaft member upward, the arm is floatingly supported on the flat surface of the shaft member, and the engagement of the locking portion is released.