JPH04210057A - Vibration preventer for rescue car - Google Patents

Abstract

PURPOSE:To hold a lift frame horizontally even in a sudden braking operation by providing a lift frame free to lift through an arm oscillating on a base carried within a rescue car while an arm is provided with a compression string and a damper to absorb vibration. CONSTITUTION:A vibration preventer V is made up of a base 1 fixed at a specified position of a rescue car C, a lift frame 2 for supporting a stretcher S disposed on the base 1, two V-shaped arms 3 and 4 for connecting the base 1 and the lift frame 2, and a hydraulic cylinder 8 and a compression spring 7 which oscillate the arms 3 and 4 so as to vary an angle of a shape of V with a support shaft on the base at the lower end thereof as fulcrum while absorbing vibration. As a result, when the arms 3 and 4 are oscillated, a guide roller moves along a guide rail even when the position of the tip of the arm moves centered on a shaft 6 depicting a circular arc with lengths of the arms 3 and 4 as radius. This enables the lifting of the lift frame 2 upward and downward smoothly with skew tilting of the arms.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibration isolating device for a bed mounted on an ambulance.

[Prior Art] For example, Japanese Patent Laid-Open No. 1-192353 discloses a vibration isolating device for a stretcher. This anti-vibration device has two dogleg-shaped arms horizontally supported at the upper center of the base so that they can rotate freely in an X shape, and a frame for mounting a stretcher is supported by a roller supported at the upper end. At the same time, 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.

Moreover, 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 part of each arm, thereby providing a drive system and vibration-proof structure. It consists of Then, when you want to lower the frame to the lower limit position, both hydraulic cylinders are contracted against the spring force, and when you want to tilt the frame forward and backward, one hydraulic cylinder is contracted and the other hydraulic cylinder is extended. In other words, when the vibration damping function is desired to be achieved, the switching valves are switched so that the piston side and rond side chambers of each hydraulic cylinder are communicated with each other.

[Problems to be Solved by the Invention] By the way, the above-mentioned vibration isolator can be satisfied by mounting a low-floor type stretcher with fixed legs, but the stretcher is equipped with a high-floor type stretcher with foldable legs. Recently, there has been a demand for this raised stretcher to be able to be mounted on a vibration isolator. Of course, if the frame of the vibration isolator mentioned above is partially improved, it is possible to mount a high-floor type one, but in that case, the total height when the stretcher is mounted will be large, so it is necessary to lower the frame to the lower limit position and use the stretcher. It is difficult to load and unload the letcher, it is difficult to treat the patient, and the ceiling of the vehicle is close to the patient, creating pressure.

Furthermore, if the hydraulic pump or the like breaks down when the frame is desired to be lowered to the lower limit position, it will be almost impossible to forcibly lower the frame against the force of the compression spring, making loading and unloading of the stretcher extremely difficult. It becomes difficult. Furthermore, when the vehicle suddenly brakes, the front part of the frame (the patient's head) lowers, causing discomfort to the patient.

Furthermore, although the damper is a hydraulic type, it is also possible to include its function in a hydraulic cylinder and eliminate the damper, but in that case, it becomes necessary to adopt a spool type as the switching valve. Then, even if it is desired to hold the frame at the lower limit position, there is a possibility that the frame will gradually rise due to oil leakage from the spool type switching valve.

The present invention has been made in view of the above-mentioned circumstances, and allows the overall height of the frame at the lower limit position to be lowered, allows the frame to be easily forcibly lowered without using a hydraulic cylinder, and furthermore, allows the frame to be lowered easily without using a hydraulic cylinder. To provide a vibration isolating device for a stretcher, which prevents a patient's head from lowering even when the patient's head is lowered even when the frame starts to rise due to oil leakage from a spool-type switching valve, and which allows the frame to be lowered to the lower limit position again. is the purpose.

[Means for Solving the Problems] The present invention has been made to achieve the above-mentioned object, and includes an elevator frame that is movable up and down via a swinging arm on a base placed in an ambulance. The bed mounted in the ambulance is supported and locked by lifting the lower part of the bed with the lift frame, and the arm is provided with a mechanism including a pair of compression springs and dampers for absorbing vibrations. In addition, the bed is placed on a lifting frame to absorb vibrations.
A guide provided at the upper end of the arm along with a vibration isolator for a bed, characterized in that the lower part of a compression spring supported in a floating state is supported on a base via a bracket that can be adjusted to move in a direction to alleviate the elasticity. The roller is supported by a guide rail that is partially or completely inclined on the lifting frame, and the lifting frame is moved within the allowable range using a set negative pressure to keep the lifting frame level even when the brakes are suddenly applied. Make sure to keep it in place. Furthermore, the damper (also known as the hydraulic cylinder) is provided with a hydraulic circuit for operating the cylinder, and the swing angle of the arm is detected by a switch to compensate for oil leakage from the spool-type control valve in the hydraulic circuit. The present invention is characterized in that the stretcher on the elevating frame is always maintained at the lower limit position.

[Example] The vibration isolating device for a bed (stretcher) according to the present invention will be described below based on the illustrated example.

In the figure, C is an ambulance, S is a stretcher that can be mounted inside ambulance C, and ■ is a vibration isolator that is installed on the ambulance side and supports the stretcher so as not to transmit the vibrations of the ambulance to the stretcher. This ambulance C is a conventional one-box car or a station wagon.

The stretcher S has caster legs at the bottom of a bed having a required size, and the caster legs can be folded as required, and has a commonly used configuration.

As shown in FIGS. 1 and 2, the vibration isolator V includes a base 1 fixed to a predetermined position of an ambulance C, and an elevating frame 2 supporting a stretcher S disposed on the base L. , the V that connects the base l and the lifting frame 2
Two arms 3, 4 forming a letter shape, and a hydraulic cylinder 8 for swinging the arms 3, 4 to change the angle of the V-shape using the supporting shaft on the mousse at the lower end as a fulcrum, and for absorbing vibrations. and a compression spring 7. Two arms 3 are attached to a single shaft 6 supported transversely at the center of the base 1 by bearings 5, 5 arranged on both sides of the base 1 in the longitudinal direction.
, 4 in a V-shape through bearings, and each arm is supported swingably in opposite directions with this shaft 6 as a fulcrum.
, 4 are made to protrude obliquely upward in a V-shape in opposite directions.

A compression spring 7 is disposed 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 disposed between the arm 3 and the base 1 on the opposite side surface. The action of the compression spring 7 and the action of the hydraulic cylinder 8 are provided so that they 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 disposed on the side surface of the central part of the arm so as to repel each other or act in the same direction, but the two arms 3 and 4 forming a V-shape are disposed. The arrangement of the hydraulic cylinders and compression springs is symmetrical to each other, ie, as shown in FIG. Therefore, the load applied to the tips 3a and 4a of the arms 3.4 is simultaneously applied to a compression spring or a hydraulic cylinder, and by operating the hydraulic cylinder, the two arms 3.4 simultaneously move the shaft 6 in the same direction. It is made to swing as a fulcrum.

The compression spring 7 has a mounting shaft 9 protruding from the arm and a mounting shaft 9 protruding opposite the mounting shaft 9 on the mousse 1 side so that the arms 3 and 4 are supported at a predetermined position between the arms and the base even when the arms 3 and 4 swing. It is supported by a movable bracket 10 provided. This compression spring 7 is attached to a bracket 7a supported by a mounting shaft 9 and a bracket 7b supported by a movable bracket 10.
A guide rod 7e protruding from this spring receiver 7c is slidably fitted into a guide tube 7g provided at the other spring receiver 7d, and the guide rod 7e and the guide tube 7g face each other at their outer peripheries. A coil spring 7f is disposed between both spring supports 7c and 7d so as to receive spring pressure. The hydraulic cylinder 8 has a bracket 8a whose proximal end protrudes from the base 1.
and supports the cylinder rod 8b at the other end.

The movable bracket 10 that supports the compression spring 7 on the base 1 has a plurality of guide rods 10a slidably inserted into a horizontal beam horizontally suspended on the base l, and the proximal ends of the guide rods 10a are fixed to the bracket body 10b, or A bracket 7b on the compression spring side is supported by a shaft 10c on the bracket main body 10b, and a guide rod 10 is fixed in an adjustable manner.
A stopper, for example, a bolt head-like one, is formed at the tip of the guide rod 10a, and the bracket is movable only by the length of the guide rod 10a, and is supported on the base side so as to be movable in the longitudinal direction of the base. Stopper bolt 1
The tip of 0c is brought into contact with and supported by the bracket body.

Therefore, when fixing the base side fulcrum of the compression spring 7, it is done using the adjustment stopper bolt 10c, and the compression force of the compression spring is supported by this bolt loc from the movable bracket body, and the spring pressure can be adjusted by turning this bolt 10c. If the lifting frame cannot be lowered due to a failure of the hydraulic cylinder, etc., loosening this bolt LOC will move the movable bracket 10 toward the outer end of the base, and the compression force of the compression spring will be released. It is easy to use arm 3,
4 can be swung to lower the elevating frame.

The elevating frame 2 is shaped to have an appropriate size to support the stretcher S. Guide rails G are provided on both sides of the elevating frame 2, and the shaft 11 is passed between the opposing guide rails. Guide rollers 12 and 12 provided at the ends of the shaft 11 are respectively supported by the guide rail G, and the shaft 11 is locked to the tips of the arms 3 and 4,
That is, the shaft 11 is supported through the arm tip. As a result, when the arms 3 and 4 swing, even if the arm tip position moves in an arc shape with the axis 6 as the center and the radius is the length of the arms 3 and 4, the guide roller will not move along the guide rail. As a result, the lifting frame 2 is smoothly raised and lowered by the tilting movement of the arm.

In addition, in the relationship between the guide rail G and the guide roller 12, even if the elevating frame 2 moves up and down smoothly, the elevating frame 2 only moves along the guide rail by a distance that the guide roller moves within the allowable range. will be able to move freely. In order to keep the movement of the elevating frame within a permissible range, a link is provided between one of the arms and the elevating frame. One end of the ring 13 is pivotally supported by the lifting frame at a position above the vertical line of the shaft 6, and the link 1
The other end of the link 13 is pivotally supported by a part of the arm, and the distance between the two shafts of the link 13 and the shaft 6 forms an isosceles triangular shape. This causes the arm 3.4 to swing (tilting motion)
When the elevating frame 2 moves up and down, the elevating frame 2 is restricted by the link 13 and moves up and down on the same vertical line, thereby preventing the frame from moving more than permissible in the longitudinal direction.

In another embodiment, as shown in FIG.
When the stretcher S is placed on the lifting frame 2 by pivoting the spring tube 13a instead of the lifting frame 2 and configuring the lifting frame 2 to be able to move back and forth slightly regardless of the swinging of the arms 3 and 4. , so that the head side of the patient is at the front in the direction of axle travel, and even if the elevating frame moves a predetermined allowable distance on the arms 3 and 4 in the event of a sudden stop, the head side is lower than the foot side. In other words, the guide rail G is bent so that the front rises and the rear slants, or the guide rail G is tilted and supported on the lifting frame 2, so that even if the vehicle is tilted forward, the stretcher on the lift frame will be horizontal or slightly tilted. It is also possible to hold it in an upwardly facing manner.

Furthermore, a locking device 14 for locking the stretcher S is provided on both sides of the upper surface of one end of the lifting frame 2. This locking device includes a fixed hook 14a having an inverted letter shape and a movable hook 14b that faces and closes the opening of the fixed hook 14a.
The fixed hooks +4a are always open in the direction in which the stretcher S is inserted, and are fixed to both left and right sides of the upper surface of one end of the lifting frame 2. The horizontal bars of the stretcher S are fitted and locked at 14a and 14a, and this locks the stretcher S in the vertical direction and the depth direction, but in the anti-insertion direction of the stretcher S. is not locked and becomes free, but it is locked by the movable hook 14b.

This movable hook 14b is swingably supported via a shaft on a bracket protruding from the elevating frame 2, and a link 14c is engaged with both the left and right movable hooks 14b, 14b, and a shaft is constructed on the elevating frame. A hell crank 14e is provided at both ends of the bell crank 14d, the lower end of the link +4c is pivotally connected to one end of the bell crank, and one end of a wire or rod 15 for hook opening/closing is locked to the other end of the bell crank. Alternatively, the tip of the rod 15 is guided along the elevating frame 2 to the front part of the frame, and an operating handle H is provided thereon. Therefore, although the movable hook 14b always closes the opening of the fixed hook with a spring,
By pulling the operating handle H, the movable hook 14 is connected to the wire or rod 15, bell crank, or link.
b is swung, the fixing hook +4a is fully opened, and the stretcher can be removed from the lifting frame. Note that when pushing the stretcher along the lifting frame, the movable hook is pushed down and automatically locked.

A hydraulic circuit as shown in FIG. 3 is constructed in the hydraulic cylinders 8, 8 which swing (tilt) the two arms 3, 4 combined in a V-shape. This is because hydraulic oil is supplied from the oil tank 20 via the hydraulic pump 21 to the valve unit 22, and this valve unit 22 intermittently sends controlled hydraulic oil to the bottom side and top side of each hydraulic cylinder 8, 8. Solenoid valve S~'1 of check valve material, SV2 of 2
A pair of valve circuits PI, P2, P3.
P4 respectively, and each valve circuit P1 to P
A tank boat circuit P5 is connected to the tank boat circuit P5 from the middle of the solenoid valves SVI and SV2.

The bottom side valve circuit P2-P4 of each hydraulic cylinder 8 is branched from this part and connected to the tank T via a flow rate adjustment valve 23.
A spool-type control valve 24 is connected to the top side valve circuit PL of the hydraulic cylinder 8 and the control valve 24 is connected to the top side valve circuit PL of the hydraulic cylinder 8.
, P3 to form a control hydraulic circuit 25.

In the stretcher vibration isolator configured as described above, when loading the stretcher S with the patient lying down on the ambulance C, first the two arms 3 and 4 assembled in a V shape are moved by operating the hydraulic cylinder 8.8. It is swung and the elevating frame 2 is stopped in a lowered state. At this time, the position of the elevating frame is below the surface of the stretcher bed.

The end of this elevating frame 2, specifically, when installed in a vehicle, is equipped with a sliding and inclined auxiliary guide rail Ra on the rear end side of the vehicle where the stretcher is taken in and out. By pulling out the auxiliary guide rail from the retracted state shown by the solid line in Figure 2 and supporting the tip of the auxiliary guide rail pulled out on the rear end floor of the vehicle as shown by the line fR in the same figure, the stretcher S can be easily moved from the auxiliary guide rail pulled out at an angle. It is then smoothly guided to the guide rail R on the top surface of the lifting frame.

Then, the stretcher S is inserted into the ambulance C using its casters at a predetermined position and transferred.

When the stretcher S is pushed to a predetermined position, the front and rear horizontal bars of the stretcher are fitted into the fixed hooks 14a by swinging the movable hooks 14b. At this time, when the horizontal bar comes to the movable hook position, the horizontal bar is locked by the movable hook, and the stretcher is locked on the elevating frame. Next, the hydraulic pump is driven and the hydraulic cylinder 8 is driven to swing the V-shaped arm 3.4 and raise the tip of the arm, so that the lifting frame 2 pushes up the lower surface of the stretcher S. The entire load of the stretcher S is supported by the lifting frame. When the lifting frame has been raised to the fixed position, the swinging of the arm 3.4 is stopped. Ambulance C is driven in this state, but at this time both control valves 24 are in the communication position.
Even if the ambulance C vibrates, the impact force is absorbed by the cooperative action of the spring 7 provided on the arm and the hydraulic cylinder 8 (actually by the flow regulating valve 23).

Note that when the elevating frame 2 is held at the lower limit position, there is a possibility that the elevating frame 2 will gradually rise due to the force of the compression spring 7 because oil leaks from the spool type control valve 24 .

To prevent this, switches SWI and SW2 are provided on the chassis or frame (not shown) so that the switches SWI and SW2 are activated when the swing angle of the arms 3 and 4 rises to a predetermined angle.

When the switches SWI and SW2 are activated, the solenoid valve is opened, hydraulic oil is sent to the rod side of the hydraulic cylinder, and the lifting frame is lowered to the lower limit position.

In the above embodiment, the arm disposed between the elevating frame and the base is in the shape of a 7, but as means for elevating and lowering the elevating frame, a parallel link type as shown in FIG. 6 or a parallel link type as shown in FIG. A parallel link or an X-shaped link is used, and either a parallel link or an X-shaped link is equipped with a pair of compression springs and a hydraulic cylinder, and functions in the same way as a V-shaped arm. Furthermore, although the bed is described as a stretcher in the above embodiments, it may also be a stretcher (furthermore, the damper may be a hydraulic cylinder equipped with a throttle valve).

[Effects of the Invention] According to the present invention, the lift frame on which the bed is placed and locked is raised and lowered in a V-shaped manner. Since the shape angle is changed, the minimum height above the floor for supporting the bed can be set lower than that of conventional models, making it easier to treat patients in the ambulance and to load and unload the ambulance.

In addition, since a compression spring and a damper are combined as a pair between the middle part of the figure-7-shaped arm and the base, and the base-side mounting bracket of the compression spring is movable, there is a possibility that the elevating frame will be damaged due to a hydraulic pump malfunction. Even if it becomes impossible to descend, there is an advantage that the lifting frame can be easily lowered from the floating state by adjusting the elastic force of the compression spring.

As shown in Fig. 4, the lifting frame provided at the upper end of the V-shaped arm must be supported within an allowable range so that the lifting frame can be moved in the front and back direction with respect to the arm, and through a guide that is partially or completely inclined. For example, even if the vehicle is in a forward downward motion during sudden braking, the elevating frame is moved forward and maintained in a horizontal state, thereby preventing unnecessary discomfort or anxiety from being caused to the sick or injured patient.

Furthermore, in maintaining the lower limit position of the lifting frame,
The bed is equipped with a compensation circuit that detects the swing angle of the arm using a switch and operates the hydraulic pump to compensate for oil leakage from the spool-type control valve, which has the advantage that the bed can be maintained at the lower limit position. have

[Brief explanation of the drawing]

The drawings show an embodiment of the vibration isolating device for a bed according to the present invention, in which Fig. 1 is a plan view, Fig. 2 is a front view, Fig. 3 is a hydraulic circuit diagram, and Fig. 4 is a hydraulic circuit diagram.
The figure is a front view of the lifting frame section of another embodiment, Figure S is an explanatory diagram of the state mounted in an ambulance, Figures 6 and 7 show different embodiments, and Figure 6 shows a parallel link. FIG. 7 is a front view of an embodiment in which the elevating frame is supported by an X-shaped sunk. C is an ambulance, S is a stretcher, ■ is a vibration isolator, 1 is a base, 2 is an elevating frame, 3 and 4 are arms, 6 is a shaft, 7
is a compression spring, 8 is a hydraulic cylinder, 14a is a fixed hook,
14b is a movable hook, 15 is a wire or rod, 2
1 is a hydraulic pump, Svl, Sv2 is a valve unit, 2
4 is a spool type control valve, and 25 is a hydraulic circuit. Patent applicant Shinmeiwa Gei Co., Ltd.

Claims (4)

[Claims] (1) Two arms are assembled in a V-shape on a base that is placed on a vehicle, and the lower end of the arm is supported by the base and the upper end is supported by the lifting frame, and the arm swings around the support shaft on the base of the arm. The lifting frame can be raised and lowered by movement, and the lifting frame supports and locks the lower part of the bed installed in the ambulance, and there is a structure between the middle part of each arm and the base to absorb vibrations. A vibration isolating device for a bed in an emergency vehicle, characterized in that a compression spring and a damper are each provided as a pair. (2) In a bed vibration isolator in which the lower part of the bed is lifted and supported by a lifting frame that is raised and lowered by the swing of an arm that is equipped with a pair of dampers and a vibration absorption mechanism using a compression spring, the base of the compression spring is A vibration isolator for a bed in an ambulance, characterized in that the vibration isolating device for a bed in an ambulance is supported on a base via a bracket whose side end portions can be elastically adjusted. (3) Place the bed on an arm equipped with a vibration absorption mechanism consisting of a pair of compression springs and dampers to support the lifting frame that locks the bed, and attach a guide roller provided at the upper end of the arm to the lifting frame, partially or completely. is supported by an inclined guide rail, and the lifting frame is held horizontally even when the front of the vehicle is descending by moving the lifting frame within an allowable range using a set negative pressure force. Anti-vibration device for beds in ambulances. (4) The lifting frame is supported on the base via the arm, and a compression spring and a hydraulic cylinder are connected between the arm and the base to swing the arm, absorb vibrations of the lifting frame, and lift the lifting frame as a pair. In addition, a hydraulic circuit for operating the cylinder is provided in the hydraulic cylinder, and the swing angle of the arm is detected by a switch to compensate for oil leakage from the spool type solenoid valve in the hydraulic circuit, and the hydraulic pump is operated. 1. A vibration isolating device for a bed in an ambulance, comprising a circuit so that a stretcher on an elevating frame can always be held at a lower limit position.