JPH0624559B2 - Anti-vibration device for stretchers in emergency vehicles - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device for raising and lowering a stretcher mounted on an ambulance, holding the stretcher at a required angle and absorbing the vibration of the vehicle.

[0002]

2. Description of the Related Art For example, Japanese Patent Laid-Open No. 1-192353 discloses a vibration isolation device for a stretcher. This anti-vibration device has two bent arms of the V-shaped arm horizontally supported on the upper center of the base so as to be rotatable in an X shape, and a roller supported on the upper end supports a frame for mounting a stretcher. In addition, an intermediate link is pivotally supported between the center of the frame and the intermediate portion of one arm so that the frame can be moved up and down. In addition, a compression spring and a hydraulic cylinder are pivotally supported between the lower end of each arm and the front and rear ends of the base, and a damper is pivotally supported between the base and the middle of each arm to provide a drive system and a vibration isolation structure. Are configured. Then, when it is desired to lower the frame to the lower limit position, both hydraulic cylinders are contracted against the spring force, and when one is desired to tilt forward and backward, one hydraulic cylinder is contracted and the other hydraulic cylinder is extended, and further floating is performed. When it is desired to bring the state, that is, the state in which the anti-vibration function can be exhibited, the switching valves are switched so that the piston side chamber and the rod side chamber of each hydraulic cylinder communicate with each other.

[0003]

However, in some cases, it may be appropriate to raise and lower the stretcher placed on the lift table and tilt the patient to lie down. In the above configuration, the lifting frame can be tilted by operating one hydraulic cylinder, but in order to maintain this tilt angle, the hydraulic cylinder on the side where the lifting frame is tilted must be locked. In the locked state of the hydraulic cylinder, the lifting frame cannot be kept in a floating state, that is, it is impossible to absorb vibration.

In the present invention, the hydraulic cylinder for raising and lowering the arm and absorbing the vibration, and the base side support portion of the compression spring are movable for each arm, whereby the stretcher on the elevating frame is in a floating state in a desired inclined state. The purpose is to

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, in which two arms are combined in a V shape on a base mounted on a vehicle, and the lower end of the arm is used as a base. The upper end is supported by the elevating frame, and the elevating frame can be moved up and down by swinging around the support shaft on the base of the arm, and the elevating frame supports and engages the lower part of the stretcher mounted in the ambulance. In the anti-vibration device to be stopped, a pair of a compression spring and a hydraulic cylinder for absorbing the elevation and vibration of the arm is provided between the intermediate portion of each arm and the base, and the compression spring, the hydraulic pressure The base side of the cylinder is supported by the movable bracket body, and this movable bracket body can be moved and adjusted by the cylinder so that the lifting frame can be moved up and down and tilted. The gist that it has none.

[0006]

[Function] Two arms swinging on a base placed in an ambulance are formed in a V shape so that an elevating frame can be raised and lowered, and a lower portion of a stretcher mounted in the ambulance is provided by the elevating frame. A mechanism including a pair of a compression spring and a hydraulic cylinder for supporting and locking by lifting and absorbing vibrations in each arm is provided. In addition, the movable bracket body allows the bed to support the floating spring to absorb the vibration and to support the lower part of the compression spring that supports it in a floating state, and to relieve the elasticity of the compression spring and the base side support part of the hydraulic cylinder. To support. This makes it possible to incline the elevating frame in an arbitrary direction and at a desired angle by changing the moving amount of each movable bracket main body and moving the movable bracket main body. In this state, by opening the hydraulic oil supply port of the hydraulic cylinder provided in each arm, it is possible to absorb the vibration by setting the elevating frame in a floating state.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A vibration isolator for a bed (stretcher) of the present invention will be described below with reference to the illustrated embodiments. In the figure, V is an anti-vibration device that supports a stretcher that can be installed in an ambulance C such as a one-box car or a station wagon so that the vibration of the ambulance is not transmitted to the stretcher. The bed with casters is provided on the lower part of the bed having a required size, and the legs with casters are foldable as required, which has a general-purpose structure.

As shown in FIGS. 1 to 3, the vibration isolator V has a base 1 fixed at a predetermined position of an ambulance, as shown in FIGS.
An elevating frame 2 arranged on the base 1 for supporting the stretcher S, two V-shaped arms 3 and 4 connecting the base 1 and the elevating frame 2 and the arms 3 and 4, V with the spindle 6 on the base at the lower end as the fulcrum
The hydraulic cylinder 8 and the compression spring 7 for changing the angle forming the character and swinging and absorbing the vibration are provided in the arms 3, 4 respectively.
It will be provided in. The base ends of the two arms 3 and 4 are attached to the one shaft 6 which is axially supported so as to cross the center of the base 1 by the bearings 5 and 5 arranged on both sides of the center of the base 1 through the bearings. V-shaped and this shaft 6
Each arm is supported so as to be swingable in opposite directions with the fulcrum as a fulcrum, and the tips of the pair of arms 3 and 4 are projected so as to extend in a V-shape obliquely upward in opposite directions.

A compression spring 7 is arranged between the arm 3 and the base 1 on the side surface of the intermediate portion of the arm 3, and a hydraulic cylinder 8 is similarly arranged on the opposite side surface of the arm 3 as a pair. The arm 3 is provided so that the action of the compression spring 7 and the action of the hydraulic cylinder 8 repel each other or act in the same direction. Similarly, on the other arm 4, a compression spring 7 and a hydraulic cylinder 8 are also arranged on the side surface of the central part of the arm so as to repel each other or act in the same direction, but two arms 3, 4 forming a V shape.
The hydraulic cylinder and the compression spring are arranged symmetrically with respect to each other, that is, as shown in FIG. Therefore, with respect to the load applied to the tips of the two V-shaped arms 3 and 4,
At the same time, it acts on the compression spring or the hydraulic cylinder so that the two arms 3 and 4 simultaneously swing in the same direction with the shaft 6 as a fulcrum when the hydraulic cylinder is operated.

Both ends of the compression spring 7 and the hydraulic cylinder 8 are mounted so as to project through the arms 3 and 4 so as to be supported at a predetermined position between the arms and the base even if the arms 3 and 4 swing. It is supported by a shaft 9 and a bracket 7h which is provided on the side of the base 1 so as to be opposed to the mounting shaft 9. The compression spring 7 is attached to a bracket 7a supported by a mounting shaft 9 and a bracket 7b supported by a bracket 7h, and spring holders 7c and 7d.
And a guide rod 7e protruding from the spring receiver 7c.
Is slidably fitted in a guide cylinder 7g provided on the other spring bearing 7d, and the guide rod 7e and the guide cylinder 7g
The coil spring 7 is provided between the spring supports 7c and 7d facing each other on the outer periphery of the
f is arranged so as to receive this spring pressure.
A hydraulic cylinder 8 paired with a compression spring has its base end side supported by a bracket 8a protruding from the base 1, and a multi-end cylinder rod 8b supported by the mounting shaft 9.

The brackets 7h and 8a on the side of the base 1 for supporting the compression spring 7 and the hydraulic cylinder 8 are projected on the movable bracket body 10, and the bracket 10a is also projected on the movable bracket body 10. The rod 11a of the bracket moving cylinder 11 is pivotally attached to the bracket 10a.

The movable bracket body 10 is movably supported by a guide rail 12 arranged on the base 1.
Cylinder 11 supported by bracket 13 on base 1
This movable bracket body 10 is moved along the guide rail 12 by retracting the rod 11a of
The support positions of the compression spring and the hydraulic cylinder 8 are moved and adjusted.

The movable bracket body 10 is provided on each of the arms 3 and 4, and the supporting positions of the hydraulic cylinder 8 and the compression spring 7 provided in pairs on each of the arms 3 and 4 are independently adjusted as desired. Yes, each arm 3,
The supporting positions of the hydraulic cylinders and the compression springs forming the four pairs are made different from each other. That is, both movable bracket bodies 10
By varying the amount of movement from the fixed position, the angle of each arm with respect to the base is varied so that the elevating frame 2 supported on the arms is inclined in a desired direction and angle from the horizontal state.

The elevating frame 2 has a trapezoidal shape formed to have a size suitable for supporting the stretcher S, has guide rails G, G on its lower surface, and a shaft 13 is provided between the guide rails facing each other. The guide rollers R, R provided at the ends of the shaft 13 are supported by the guide rail G, respectively, and the shaft 13 is locked to the tips of the arms 3 and 4, that is, the shaft 13 penetrates the tip of the arms. Support me. As a result, when the arms 3 and 4 swing, even if the tip positions of the arms move in an arc shape with the length of the arms 3 and 4 as a radius around the shaft 6, the guide rollers are moved along the guide rails. As a result, the elevating frame 2 is smoothly moved up and down by the tilting movement of the arm.

With respect to the relationship between the guide rail G and the guide roller R, even if the elevating frame 2 moves up and down smoothly, the elevating frame 2 moves in the front-back direction (longitudinal direction) only by the distance along which the guide roller moves within the allowable range. Direction) will move freely. In order to keep the movement of the lifting frame within the allowable range, one link is bridged between one of the arms and the lifting frame. One end of the link 14 is pivotally supported by the lifting frame at a position above the vertical line of the shaft 6, and the other end of the link 14 is pivotally supported by a part of the arm. As a result, when the raising and lowering frame 2 moves up and down by the swinging (inclining movement) of the arms 3 and 4, the raising and lowering frame 2 is restricted by the link 14 and moves up and down on the same vertical line, in the longitudinal direction of the frame. It is possible to prevent more than the allowed movement.

In the vibration isolator constructed as described above, when raising and lowering the raising and lowering frame in a normal horizontal state, the hydraulic cylinders 8 of both arms 3 and 4 are simultaneously extended or retracted by equal amounts of the rods. To do. In order to absorb the vibration at the stop position of the lifting frame, the lifting frame is brought into a floating state by opening the supply port of each hydraulic cylinder.

When the stretcher is tilted, the movable bracket main body 10 supporting the hydraulic cylinder of one desired arm and the compression spring is moved by operating the cylinder 11. As a result, the angles of depression and elevation of both arms 3 and 4 become different, and the elevating frame tilts. At this time, the tilt direction and angle of the elevating frame are determined by which of the left and right movable bracket bodies is moved and the amount of movement. In this state, the ports of both hydraulic cylinders 8 are opened to make them floating.

[0018]

According to the present invention, the compression spring and the base side of the hydraulic cylinder, which are provided as a pair on each of the two V-shaped arms provided with the elevating frame for mounting the stretcher, are connected via the movable bracket body. Since the bases are movable and independently provided, the elevation angles of the two V-shaped arms can be set arbitrarily, so that the elevating frame can be tilted in any direction and at any angle. The floating state can be maintained as when the lifting frame is horizontal, and vibration can be absorbed regardless of the posture of the stretcher.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a vibration isolation device for a stretcher in an emergency vehicle of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a plan view with the lifting frame removed.

FIG. 4 is a side view of the same.

FIG. 5 is an explanatory diagram showing a tilted state of a lifting frame.

[Explanation of symbols]

 V anti-vibration device 1 base 2 lifting frame 3 arm 4 arm 6 axis 7 compression spring 8 hydraulic cylinder 10 movable bracket 11 hydraulic cylinder G guide rail R guide roller

Claims (3)

[Claims] 1. A combination of two arms in a V shape on a base mounted on a vehicle, and a lower end of the arm as a base,
The upper end is supported by the elevating frame, and the elevating frame can be moved up and down by swinging around the support shaft on the base of the arm, and the elevating frame supports and engages the lower part of the stretcher mounted in the ambulance. In the anti-vibration device to be stopped, a pair of a compression spring and a hydraulic cylinder for absorbing the elevation and vibration of the arm is provided between the intermediate portion of each arm and the base, and the compression spring, the hydraulic pressure The base side of the cylinder is supported by a movable bracket main body, and the movable bracket main body can be moved and adjusted by the cylinder so that the elevating frame can be moved up and down and tilted. Anti-vibration device. 2. The vibration control device for a stretcher in an emergency vehicle according to claim 1, further comprising a vibration absorbing mechanism including a compression spring and a damper. 3. A pair of a compression spring and a hydraulic cylinder that supports an elevating frame on a base via an arm, swings the arm, absorbs vibration of the elevating frame, and ascends and descends to form a pair with the arm and the base. This hydraulic cylinder is provided with a hydraulic circuit for operating the cylinder, and the stretcher on the lifting frame is moved to the required angle and direction by operating the solenoid valve in the hydraulic circuit. The method according to claim 1, wherein tilting and raising / lowering are performed.
Alternatively, the vibration isolation device for the stretcher in the ambulance described in 2.