JP2006263287A - Vibration-proof bed - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration-proof bed capable of locking an upper frame even if a lifting device fails. <P>SOLUTION: A lock mechanism 111 for preventing upward movement of an upper frame relative to a lower frame 12 consists of a ratchet part 121 disposed on the upper frame side and a lock part 124 disposed on a front wall 122 of the lower frame 12. Saw-teeth-like teeth 125 are formed in the ratchet part 121, and a pawl part 134 is stored in a prismatic part 133 of the lock part 124 to be energized by a spring 142. The locked state 151 of the upper frame, in which the downward movement of the ratchet part 121 is permitted while the upward movement is prevented, is formed by engaging the pawl part 134 with the teeth 125. The unlocked state 171 of the upper frame, in which the upward movement of the ratchet part 121 is permitted, is formed by making a control bar 162 of the pawl part 134 abut to an end edge of a cylindrical part 132. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an anti-vibration bed that supports, for example, a stretcher.

  Conventionally, an anti-vibration bed is provided in the rear room of an ambulance.

  This anti-vibration bed is configured to be able to support the transported stretcher in a mounted state, and the upper frame that supports the mounting portion of the stretcher is an air suspension whose four corners constitute a buffer mechanism. It is supported. Thereby, it is comprised so that the transmission to the said stretcher of the vibration at the time of driving | running | working can be suppressed.

  However, in such a conventional anti-vibration bed, the upper frame is locked to prevent vertical movement when performing heart massage or the like, but the upper frame cannot be locked when the lifting device fails. There was a problem.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a vibration isolating bed that can lock the upper frame even when the lifting device is out of order.

  In order to solve the above problems, in the vibration isolating bed of the present invention, the vibration isolating bed in which the upper frame constituting the placement portion side is supported by the lower frame constituting the floor side so as to be movable up and down via the buffer mechanism. The bed is provided with a lock mechanism for preventing the upper frame from moving upward with respect to the lower frame, and the lock mechanism is provided on the upper frame side and moves up and down together with the upper frame, and a plurality of teeth are arranged vertically. A ratchet part, a locked state that is provided on the lower frame side and engages with the ratchet part to allow the ratchet part to move downward but prevent the ratchet part from moving upward, and an unlocked state that allows the ratchet part to move upward A claw portion that forms the locked state by engaging the lock portion with any of the teeth of the ratchet portion, An urging means for urging the claw part toward the ratchet part and projecting the claw part to a position where the claw part engages with the teeth; and the unlocking mechanism in which the claw part is retracted to a position away from the ratchet part. And claw fixing means for preventing movement of the claw portion in the protruding direction by the urging means in the state.

  That is, when locking the upper frame supported by the buffer mechanism, the retracted state of the claw part by the claw fixing means of the lock part is released, and the claw part urged by the urging means in the protruding direction. Allow movement. Then, when the claw portion engages with any tooth of the ratchet portion, a locked state is formed in which the ratchet portion is allowed to move downward but is prevented from moving upward. As a result, the upper frame is prevented from moving upward.

  In this state, when a load is applied to the upper frame, the ratchet portion moves downward together with the upper frame. At this time, in the ratchet portion, a plurality of teeth are arranged vertically, and the claw portion engages with lower teeth.

Then, the upper frame is prevented from moving upward by the engagement with the teeth, and the upward urging force from the buffer mechanism supporting the upper frame is increased, or the upper frame reaches the lower limit position. .
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  Accordingly, the upper frame is fixed at a balance position between the load and the urging force from the buffer mechanism, or fixed at a lower limit position.

  As described above, in the vibration isolating bed of the present invention, the height position of the upper frame constituting the placement portion side can be fixed by using the lock mechanism provided in the vibration isolating bed.

  Therefore, even when the lifting device that lifts and lowers the upper frame breaks down, the upper frame constituting the placement portion side can be locked.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a view showing an anti-vibration bed 1 according to the present embodiment. The anti-vibration bed 1 is provided in a rear chamber of an ambulance and can be supported in a state where a loaded stretcher is placed. It is configured.

  The anti-vibration bed 1 includes a lower frame 12 fixed to a floor 11, an upper frame 13 supported so as to be movable up and down with respect to the lower frame 12, and a buffer for supporting the upper frame 13 on the lower frame 12. As shown in FIG. 2, a placement portion 15 on which a stretcher is placed is provided on the upper frame 13.

  As shown in FIG. 1, the buffer mechanism 14 is configured around four-bar links 21 and 21 provided on the left side and the right side of the vibration-isolating bed 1. It has the same structure. The four-bar link 21 includes an upper link 22 formed by a side member of the upper frame 13, and a front portion rotatably supported by a front support portion 23 of the upper link 22 via a front bracket 24. A moving link 25, a rear rotating link 28 rotatably supported by a rear support portion 26 of the upper link 22 via a rear bracket 27, and a connecting link 29 connecting both the rotating links 28, 28. It consists of

  As shown in FIG. 2, the rear rotation link 28 is formed in an L shape by a plate material, and a rotation center point 31 is set at a corner portion thereof. As shown in FIG. 1, a shaft portion 32 protrudes from the rotation center point 31, and the shaft portion 32 is attached to a bracket 34 erected on the lower frame 12 via a bearing 33. It is supported rotatably. The rear turning link 28 constituting the left four-link 21 and the rear turning link 28 constituting the right four-joint link 21 have short pieces 35 and 35 and long pieces 36 and 36 connected in series. Bars 37 and 37 are connected to each other, and rear pivot links 28 and 28 of both four-bar links 21 and 21 are configured to be interlocked.

  A rear end portion of the connecting link 29 is rotatably supported on a free end portion of the rear rotating link 28 on the short piece 35 side, and a free end portion of the rear rotating link 28 on the long piece 36 side is supported. The bush portion 38 of the rear bracket 27 is fixed.

  As shown in FIG. 2, the front rotation link 25 is also formed of a plate material, and a rotation center point 41 is set at a site on the rear side. As shown in FIG. 1, a shaft portion 42 protrudes from the rotation center point 41, and the shaft portion 42 is attached to a bracket 44 erected on the lower frame 12 via a bearing 43. It is supported rotatably. The front rotation link 25 that constitutes the four-joint link 21 on the left side and the front rotation link 25 that constitutes the four-joint link 21 on the right side are connected at the front end by a front cross member 45, and thereafter The ends are connected by a rear cross member 46. Accordingly, the front pivot links 25 and 25 of the four-joint links 21 and 21 are configured to be interlocked by being connected by the cross members 45 and 46.

  As shown in FIG. 2, the front rotation link 25 is provided with a downward extension 51 extending downward from the rotation center point 41, and the downward extension 51 A front end portion of the connecting link 29 is rotatably supported on the free end portion. As shown in FIG. 1, a bush portion 52 of the front bracket 24 is fixed to the front end portion of the front rotation link 25.

  The front rotating link 25 is provided with a front extending portion 61 extending forward, and the front cross member 45 is fixed to the front extending portion 61 as shown in FIG. Has been. The front cross member 45 is configured to move up and down within a stopper bracket 62 provided on the lower frame 12, and an upper stopper 63 is provided on the top surface of the stopper bracket 62. The bottom bracket 64 to which the stopper bracket 62 is fixed is provided with a lower stopper 65, and the front rotation link 25 is located at an upper limit position where the front cross member 45 is in contact with the upper stopper 63. To the lower limit position where the front cross member 45 is in contact with the lower stopper 65 is configured to rotate within a movement range.

  A spring support bracket 71 is erected at the center of the front rotation links 25, 25, and a lower cover 72 is pivotally supported on the spring support bracket 71. A coil spring 73 is held on the lower cover 72, and the coil spring 73 can be tilted back and forth about a tilt center 74 that pivotally supports the lower cover 72. An upper cover 75 is provided at the upper end of the coil spring 73, and center cross members 76 and 76 extend from both sides of the upper cover 75 as shown in FIG.

  As shown in FIG. 3, a plate-like guide 81 that movably supports the upper end of the coil spring 73 is provided on the inner side surface of the front rotation link 25, and the guide 81 is The coil spring 73 is formed in an arc shape centered on the tilt center 74. An upper roller 82 provided on the end surface of the center cross member 76 is configured to roll on the upper surface of the guide 81, and a lower roller provided on the end surface of the center cross member 76 on the lower surface of the guide 81. 83 and 83 are configured to roll.

  Thus, the upper end portion of the coil spring 73 is supported by the front rotation link 25 via the rollers 82, 83, 83 and the guide 81, and the rotation of the front rotation link 25 is performed. The coil spring 73 is disposed between a portion on the upper frame 13 side from the moving center point 41 and the lower frame 12, and the urging force from the coil spring 73 is a force that moves the upper frame 13 upward. It is comprised so that it may be given as. Further, when the rollers 82, 83, 83 roll along the guide 81, the support point 85 to the front rotation link 25 by the coil spring 73 is configured to move back and forth. The lever ratio determined by the separation distance from the pivot center point 41 of the front pivot link 25 to the support point 85 can be changed.

  As shown in FIG. 1, a drive unit support member 91 is swingably supported on the upper part of the rear cross member 46, and the drive unit support member 91. Is provided with a drive unit 92 for changing the tilt angle of the coil spring 73. The drive unit 92 is configured around a drive motor 93 provided on the drive unit support member 91, and a ball screw 95, 95 is connected to a rotation shaft of the drive motor 93 via a gear box 94, 94. It is connected. As shown in FIG. 3, the ball screw 95 extends forward. The ball screw 95 is screwed into screw portions 96 and 96 supported by the center cross member 76 in a swingable manner. ing.

  Thus, when the drive motor 93 is operated and the coil spring 73 is tilted forward along the guide 81, the lever ratio can be increased. When tilted backward along 81, the lever ratio can be reduced.

  A baffle plate 101 extending downward is provided on the front wall surface of the front cross member 45, and a height sensor for detecting the height position of the baffle plate 101 is provided on the stopper bracket 62. (Not shown). Thereby, when the stretcher is placed on the placement unit 15 and the upper frame 13 is lowered by the weight of the patient carried by the stretcher, by operating an auto level switch (not shown), By controlling the drive motor 93 based on an input from a height sensor and changing the lever ratio, the tilt angle of the front rotation link 25 is always controlled to be the same angle. The height position of the upper frame 13 supported by the front rotation link 25 is always maintained at the same height.

  Further, when the lowering switch is operated, the lever ratio is changed by the drive motor 93 so that the urging force by the coil spring 73 is applied to make the front cross member 45 contact the lower stopper 65. The front rotation link 25 is configured to rotate to a lower limit position in contact therewith, and the upper frame 13 supported by the front rotation link 25 can be lowered to a lower limit position.

  As shown in FIG. 4, a lock mechanism 111 that prevents the upper frame 13 from moving upward with respect to the lower frame 12 is provided at the front end of the lower frame 12.

  As shown in FIG. 5, the lock mechanism 111 includes a ratchet portion 121 provided on the upper frame 13 side and a lock portion 124 provided on a front wall 122 of the lower frame 12 via a support bracket 123. It is configured. The ratchet portion 121 is provided on the front cross member 45 that bridges the front rotation links 25, 25 on the upper frame 13 side (see FIG. 4). The ratchet portion 121 is a vertically long rectangle. It is formed in a plate shape. At the front end of the ratchet portion 121, a plurality of saw-toothed teeth 125,... Are arranged in the vertical direction, and the upper edge 126 of each tooth 125,. The lower edge 127 is formed so as to incline upward toward the front FR.

  The lock portion 124 includes a cylinder 131 supported at the front end portion of the lower frame 12 via the support bracket 123. The cylinder 131 includes a cylindrical portion 132 that forms a front end side, It is configured by a rectangular tube-shaped square tube portion 133 that is connected to the cylindrical portion 132. The square tube portion 133 accommodates a claw portion 134 having a tapered tip portion so as to be movable. The claw portion 134 has a bottom surface 135 extending horizontally and a base end side toward the tip. Accordingly, an inclined surface 136 inclined toward the bottom surface 135 is formed.

  A spring 142 as a coil-shaped urging member is fitted on the rod 141 extending from the claw portion 134, and the spring 142 is provided between the end surface 143 of the cylindrical portion 132 and the claw portion 134. Is held in. The claw portion 134 is biased toward the ratchet portion 121 by the spring 142, and the claw portion is in a state where a stopper 144 provided at the end portion of the rod 141 is in contact with the end surface 143. 134 is configured to protrude to a position where it engages with the tooth 125.

  The claw part 134 is configured to be able to form an engaged state engaged with any of the teeth 125 provided in the ratchet part 121. In this engaged state, the bottom surface 135 of the claw part 134 is formed. The ratchet portion 121 is prevented from moving upward with respect to the lock portion 124 in a state where it is in contact with the upper edge 126 of the tooth 125. Further, the inclined surface 136 of the claw part 134 is configured to contact the lower edge 127 of the tooth 125, and is configured to retract the claw part 134 when the ratchet part 121 is moved downward. . As a result, as shown by a broken line in FIG. 5, the ratchet portion 121 is allowed to move downward, but the ratchet portion 121 is prevented from moving upward.

  The stopper 144 is provided with a rotating part 161 so as to be rotatable, and the rotating part 161 is provided with an operation bar 162 extending sideways. Further, an insertion groove 163 for inserting the operation bar 162 is formed at an edge of the cylindrical portion 132, and the operation bar 162 moves to the front FR along the insertion groove 163, and the operation bar The operation bar 162 is configured to maintain a supporting state in contact with the end edge of the cylindrical portion 132 by rotating the 162 to be displaced from the insertion groove 163.

  Accordingly, as shown by a solid line in FIG. 5, the claw part 134 is retracted to a position away from the ratchet part 121 to form an unlocked state 171 that allows the ratchet part 121 to move upward, and The spring 142 is configured to prevent the claw portion 134 from moving in the protruding direction.

  In this embodiment according to the above configuration, when performing cardiac massage on a patient on a stretcher supported by the vibration isolating bed 1, the upper frame 13 supported by the buffer mechanism 14 so as to be movable up and down is locked. Need arises. In this case, the operation bar 162 provided on the stopper 144 of the lock portion 124 is rotated and inserted into the insertion groove 163 opened at the end of the cylindrical portion 132, and the retracted state of the claw portion 134 is released. The claw portion 134 biased by the spring 142 is allowed to move in the protruding direction.

  At this time, the claw portion 134 engages with any tooth 125 of the ratchet portion 121 provided on the front rotation link 25, and allows the downward movement of the ratchet portion 121 but prevents the upward movement. State 151 is formed. Thereby, the upper frame 13 supported by the four-bar link 21 having the front rotation link 25 is prevented from moving upward.

  In this state, when a load is applied to the mounting portion 15 on the upper frame 13, the ratchet portion 121 moves downward together with the upper frame 13. At this time, the ratchet portion 121 has a plurality of teeth 125 arranged vertically, and the claw portion 134 engages with the lower teeth 125.

  Then, the upward movement of the upper frame 13 is prevented by the engagement with the teeth 125, and the upward biasing force from the buffer mechanism 14 that supports the upper frame 13 is increased. Thereby, the upper frame 13 is fixed at a balance position between the load and the urging force from the buffer mechanism 14.

  Alternatively, the upper frame 13 is lowered to the lower limit position where the front cross member 45 provided on the front rotation link 25 contacts the lower stopper 65, and the upper frame 13 is fixed at the lower limit position.

  Thus, by using the lock mechanism 111 provided in the vibration isolating bed 1, the height position of the upper frame 13 that supports the placement unit 15 can be fixed.

  Therefore, even when the lifting device that lifts and lowers the upper frame breaks down, the upper frame 13 constituting the placement portion 15 side can be locked.

It is a disassembled perspective view which shows one embodiment of this invention. It is sectional drawing of the same embodiment. It is sectional drawing which shows the principal part of the embodiment. It is a perspective view which shows the front-end part of the embodiment. It is SA-SA sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anti-vibration bed 11 Floor 12 Lower frame 13 Upper frame 14 Buffer mechanism 15 Placement part 111 Lock mechanism 121 Ratchet part 124 Lock part 125 Tooth 134 Claw part 142 Spring 151 Lock state 171 Unlock state

Claims (1)

In the vibration isolating bed in which the upper frame constituting the placement unit side is supported by the lower frame constituting the floor side so as to be movable up and down via the buffer mechanism,
A lock mechanism for preventing the upper frame from moving upward relative to the lower frame;
The locking mechanism is provided on the upper frame side and moves up and down together with the upper frame, and a plurality of teeth are vertically arranged, and the ratchet portion provided on the lower frame side is engaged with the ratchet portion. A lock state that allows a downward movement of the portion but prevents an upward movement, and a lock portion that forms an unlocked state that permits the upward movement of the ratchet portion,
A claw portion that engages any one of the teeth of the ratchet portion to form the locked state, and the claw portion is urged toward the ratchet portion side so that the claw portion is the tooth. An urging means for projecting to a position engaging with the pawl; and a pawl for preventing the urging means from moving in the projecting direction by the urging means in the unlocked state in which the pawl portion is retracted to a position away from the ratchet portion. A vibration isolating bed comprising a fixing means.

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