JP4853628B2 - Portable jack - Google Patents

Description

  The present invention relates to a portable jack, and more particularly to a portable jack suitable as a rescue tool used in an emergency such as a disaster.

  In the event of a disaster such as an earthquake, debris and collapsed materials must be removed quickly to rescue the people left behind in the collapsed house. Familiar rescue tools that can be used in an emergency include insulators such as bars and bars, and portable pantograph jacks mounted on automobiles to maintain automobiles.

  The lever-type member has an advantage that it is convenient for carrying and quick hoisting operation by inserting the tip of the member into a narrow gap between heavy objects and lifting or moving the heavy object by arm force according to the principle of the lever. However, there is a drawback in that the load collapses easily during the operation, and the lifted heavy object returns to the original state when the arm force is loosened, and the hand cannot be released during the operation.

  The pantograph jack for automobiles can be applied to heavy objects exceeding 100 kilograms, and has an advantage that it is relatively easy to obtain even in an emergency. However, since this type of pantograph jack has a structure that exerts thrust from a state where it is opened to some extent, it is not very useful for applications that expand narrow gaps.

In order to overcome these drawbacks, Patent Document 1 discloses a hoisting device having a structure in which the angle of a pair of links intersecting in an X shape is changed by driving means. According to this hoisting device, a heavy object can be hoisted from a narrow gap, and the risk of collapse of the load during operation is low.
JP 2003-201092 A

  However, the hoisting device described in Patent Document 1 is a relatively large dedicated device provided with driving means, and is inconvenient to carry. Moreover, since the drive means using a screw mechanism is adopted, there is a drawback that the lifting operation is slow.

  The object of the present invention is to improve the above-mentioned drawbacks of the prior art, take advantage of the advantages of a lever-type member that is convenient to carry and has a quick lifting operation, and is less likely to collapse during operation and can be released after lifting. An object of the present invention is to provide a portable jack that can hold a heavy object in its position.

  In order to achieve the above object, a portable jack according to the present invention includes a base member having a first insertion claw formed at the tip, a guide member that is integrated with the base member and rises vertically from the base member, A second insertion claw that faces the first insertion claw is formed at the tip, and includes a moving member that is slidably engaged with the guide member, a pin coupling portion at both ends, and the pin coupling portion at one end is moved. A link rotatably connected by a member and a first pin, and a tip of one side formed with a bent portion are rotatably connected by a pin connecting portion on the other end of the link and a second pin. And a bending lever that is rotatably connected by the base member and a third pin, and an extension portion on the other side is a rod-like handle, and the bending lever is provided with the third pin as a fulcrum. When it is turned, Slide the moving member along the guide member through the click, the distance between the first insertion nail and said second insertion nail and said increasing or decreasing.

In the portable jack having the above-described configuration according to the present invention, the bending lever is rotated as much as possible with the third pin as a fulcrum to widen the interval between the first insertion claw and the second insertion claw. The position of each pin is set so that the second pin passes through a straight line connecting the first pin and the third pin.
In the portable jack configured as described above, it is desirable that a stopper for limiting the rotation angle of the bending lever is provided on the base member.

  The portable jack of the present invention has a simple structure and is convenient to carry. Further, since a heavy object can be raised by a single operation of tilting the bar-shaped handle from the vertical position to the horizontal position, the lifting operation is fast as in the case of the conventional bar. In addition, since the heavy object is raised vertically while the first insertion claw and the second insertion claw are kept parallel, the operation is stable and the collapse of the load is less likely to occur during the operation. In addition, even if the hand is lifted after lifting, there is an extraordinary effect that the weighted weight can be held in that position.

  FIG. 1 is an exploded perspective view showing an embodiment of a portable jack according to the present invention, FIG. 2 is a side view showing the state before use, and FIG. 3 is a side view showing the state during use. 4 is a view taken in the direction of arrows AA in FIG.

  The portable jack 10 is mainly composed of a base member 12, a guide member 14, a moving member 16, a pair of links 18A and 18B, a pair of bending levers 20A and 20B, and a rod-like handle 22.

  A first insertion claw 24 is formed at the tip of the base member 12, and a guide member 14 integrated with the base member 12 is erected in the vertical direction at the center of the base member 12. A guide groove 26 is formed in the guide member 14 in the vertical direction. The moving member 16 is formed in an L shape, and the tip of the horizontal side 16 a is a second insertion claw 28 that faces the first insertion claw 24. A vertical side 16b extends upward from the other end of the horizontal side 16a at a right angle. The vertical side 16b and the guide member 14 are in contact with each other, and a piece 30 provided so as to protrude laterally from the vertical side 16b passes through the guide groove 26 of the guide member 14 and projects to the opposite surface of the guide member 14. . Therefore, the moving member 16 is slidable in the standing direction of the guide member 14 by the piece 30 provided on the vertical side 16 b being guided by the guide groove 26 of the guide member 14. The moving member 16 is reinforced by a reinforcing member 16c that connects the horizontal side 16a and the vertical side 16b.

  One end of L-shaped links 18 </ b> A and 18 </ b> B each having a pin coupling portion at both ends is rotatably coupled to the vertical side 16 b of the moving member 16 via a first pin 32. The other ends of the links 18A and 18B are rotatably connected to the tips of one side 36A and 36B of the pair of bending levers 20A and 20B via second pins 34A and 34B, respectively. The bending levers 20 </ b> A and 20 </ b> B are also bent in an L shape, and the bent portions are rotatably connected to the base member 12 via third pins 38 that penetrate through the base member 12. In addition, the rod-like handle 22 is connected to the extension part of the other side 40A, 40B of the bending levers 20A, 20B via a connecting tool 42.

  In the portable jack 10 having the above-described configuration, when the bending levers 20A and 20B are rotated with the third pin 38 as a fulcrum, the moving member 16 slides along the guide member 14 via the links 18A and 18B. 12 The distance between the first insertion claw 24 at the distal end and the second insertion claw 28 at the distal end of the moving member 16 increases or decreases. Therefore, when the rod-like handle 22 is rotated by human power from the state before use shown in FIG. 2, the bending levers 20A and 20B connected to the rod-like handle 22 rotate around the third pin 38, and the moving member 16 guides. It moves upward along the member 14. As a result, the upper surface of the first insertion claw 24 and the lower surface of the second insertion claw 28 that are in contact with each other before use are largely opened as shown in FIG. FIG. 5 is a perspective view showing the situation until the portable jack 10 in the state (1) shown in FIG. 2 reaches the state (4) shown in FIG. 3 through the state (2) and the state (3). .

  2 and 3 is a bar-shaped stopper protruding from the rear end portion of the base member 12. The stopper 44 restricts the rotation angle of the bending levers 20A and 20B as shown in FIG. 3 and prevents the reversing operation in which the moving member 16 that has reached the apex of the guide member 14 descends again.

FIG. 6 is an explanatory view illustrating the usage form of the portable jack 10 having the above-described configuration. At the time of a disaster, in order to rescue people left behind in a collapsed house or the like, there are cases in which heavy objects such as collapsed objects must be removed quickly. In such a case, a rescuer carrying the portable jack 10 rushes to the collapse site, and the first insertion claw 24 and the second insertion claw 28 of the portable jack 10 are moved as shown in FIG. Inserted in the gap g ₀ between the ground 50 and the heavy object 52 in the closed state. Then, as shown in FIG. 5, the rod-like handle 22 is manually lowered from the vertical position to the horizontal position. As a result, the distance between the first insertion claw 24 and the second insertion claw 28 is increased while the heavy object 52 is lifted against the load, and the ground 50 and the heavy object as shown in FIG. 6 (2). The gap with 52 can be expanded to g ₁ and can contribute to securing a rescue route.

  Note that the portable jack 10 having the above-described configuration has the interval between the first insertion pawl 24 and the second insertion pawl 28 increased by rotating the bending lever 20 to the maximum with the third pin 38 as a fulcrum. The position of each pin is set so that the second pin 34 passes through a straight line connecting the first pin 32 and the third pin 38. When each pin is set to such a position, from the moment when the second pin 34 passes through a straight line connecting the first pin 32 and the third pin 38, a heavy object that is raised even when the hand is released is removed. It can be stably held in that position.

FIG. 7 is an explanatory diagram illustrating the dynamic relationship in an easy-to-understand manner. In the situation shown in FIG. 5, when a heavy object is raised by the second insertion claw 28, the heavy object load W acts as a vertical load on the position of the second pin 34 of the bending lever 20 via the link 18. . In the initial stage of FIG. 7 (1), the horizontal distance from the second pin 34 to the third pin 38 in the bending lever 20 is l ₁ , and the distance from the position where the human power is applied to the third pin 38 is L. Then, the human power P ₁ necessary for raising the load W of the heavy object is P ₁ = (l ₁ / L) · W. Further, in the middle stage of FIG. 7B, the force acting on the second pin 34 due to the load W is a linear component force Fa connecting the second pin 34 and the third pin 38, and a third force. The pin 38 can be divided into circumferential component force Fb. The magnitude of each component force can be expressed as Fa = W · sin θ and Fb = W · cos θ, where θ is the tilting angle of the bending lever 20. At this time, the human power P ₂ required to raise the load W is P ₂ = (l ₁ / L) · Fb = (l ₁ / L) · W · cos θ. Accordingly, since the angle θ is 90 degrees tilted in the final stage of FIG. 7 (3), human power P ₃ need requires zero.

  FIG. 8 shows the above relationship, and the manpower P necessary for raising the heavy object decreases along the cosine curve as the tilt angle θ from the vertical position of the rod-like handle 22 is increased. Go. When the tilt angle θ is close to 90 degrees, the human power P becomes zero, and the rod-shaped handle is further tilted from this zero point, and the second pin 34 passes the straight line connecting the first pin 32 and the third pin 38. From the moment, human power P becomes negative. When the human power P is negative, even if no positive force is applied to the human power P, it means that the rod-like handle 22 is naturally tilted by a heavy load and moves the angle θ greatly. Therefore, the position of the stopper 44 is set so that the maximum value of the tilt angle θ of the rod-like handle 22 is a point X slightly larger than the zero point near 90 degrees. Then, in the state where the bar-shaped handle 22 is tilted and is at the maximum point X of the angle θ, even if the operator releases his / her hand from the bar-shaped handle 22, the load of the raised heavy load will press the bar-shaped handle 22 against the stopper 44. Works. For this reason, it is possible to stably hold the heavy object raised in the state where the hand is released in that position.

  As described above, the portable jack 10 of this embodiment has a simple structure and is convenient to carry. Further, since a heavy object can be raised by a single operation of tilting the rod-shaped handle 22 from the vertical position to the horizontal position, the lifting operation is fast as in the conventional bar. In addition, since the heavy load is raised vertically while the first insertion claw 24 and the second insertion claw 28 are kept parallel, the operation is stable and the collapse of the load is less likely to occur during the operation. In addition, there is an extraordinary effect that even if the hand is lifted after lifting, the raised heavy object can be held in that position.

  In the above embodiment, the case where a heavy object is raised vertically by the portable jack 10 has been described. However, the portable jack 10 is not limited to such an application. For example, assuming that FIG. 6 is a plan view and reference numeral 50 is a wall, the insertion claws 24 and 28 of the portable jack 10 are inserted into the gap between the wall and the heavy object 52, and the heavy object 52 is It can also be used when moving in the direction. In this case, since the use posture of the portable jack 10 is greatly changed, various terms relating to the direction described in the above embodiment can be appropriately read and understood.

  The portable jack 10 of the above embodiment has a structure having a pair of links 18A and 18B and a pair of bending levers 20A and 20B. However, the present invention is not limited to this, and includes a structure in which one link and one bending lever are provided by a design change. Moreover, the thing of the structure where the bending lever and the rod-shaped handle were integrated is included. Further, the moving member 16, the link 18, and the bending levers 20A and 20B of the above embodiment are formed in an L shape from a geometrical viewpoint for facilitating insertion of the insertion claws 24 and 28 into the target gap. However, the shape of these members according to the present invention is not limited to an L shape, and may be, for example, a triangle shape or an arc shape as long as practicality can be ensured.

It is a disassembled perspective view which shows embodiment of the portable jack which concerns on this invention. 1 is a side view showing a state before use of a portable jack 10. 2 is a side view showing a state when the portable jack 10 is used. FIG. It is an AA arrow line view of FIG. FIG. 3 is an exploded perspective view showing an operation state of the portable jack 10. FIG. 3 is an explanatory diagram illustrating a usage form of the portable jack 10. 3 is an explanatory diagram showing a mechanical relationship of the portable jack 10. FIG. It is explanatory drawing which showed the relationship between human power and a tilt angle.

Explanation of symbols

10 ......... Portable jack, 12 ......... Base member, 14 ......... Guide member, 16 ......... Moving member, 16a ......... Horizontal side, 16b ......... Vertical side, 16c ......... Reinforcing material, 18A, 18B ......... Link, 20A, 20B ......... Bending lever, 22 ......... Bar handle, 24 ...... First insertion claw, 26 ......... Guide groove, 28 ......... Second insertion claw , 30 ......... Piece, 32 ......... First pin, 34A, 34B ......... Second pin, 36A, 36B ......... One side, 38 ......... Third pin, 40A, 40B ... ... the other side, 42 .... connector, 44 .... stopper, 50 .... ground, 52 .... heavy.

Claims (3)

  A base member in which a first insertion claw is formed at the tip, a guide member that is integrated with the base member and rises vertically from the base member, and a second insertion claw that faces the first insertion claw at the tip A movable member that is slidably engaged with the guide member, a pin coupling portion provided at both ends, and a link in which the pin coupling portion at one end is rotatably coupled by the movable member and the first pin; The tip of one side formed with a portion is rotatably connected by the pin connecting portion and the second pin at the other end of the link, and the bent portion is freely rotatable by the base member and the third pin. A bending lever that is connected and has an extension on the other side as a rod-like handle. When the bending lever is rotated with the third pin as a fulcrum, the moving member is moved to the guide member via the link. Slide along and forward Portable jack distance between the first insertion nail and said second insertion nail and said increasing or decreasing.   When the bending lever is rotated to the maximum with the third pin as a fulcrum to increase the distance between the first insertion claw and the second insertion claw, the first pin and the third pin are The portable jack according to claim 1, wherein the position of each pin is set so that the second pin passes through a straight line to be connected.   The portable jack according to claim 1 or 2, wherein a stopper for limiting a rotation angle of the bending lever is provided on the base member.

Images