JP2007261781A - Jack with claw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact jack with a claw convenient in use, suitable for a rescue unit used in a narrow disaster site. <P>SOLUTION: The jack 10 with the claw is provided with a fixed claw 12; a moving claw 14 approachably/separably movable relative to the fixed claw; a screw mechanism 16 for moving the moving claw 14 by rotation force of a screw; a lifting rachet type wrench 18 for rotating the screw; and a quick feeding manual rotation handle 20 for rotating the screw. A heavy weight article is lifted by rotating the screw of the screw mechanism 16 by the rachet type wrench 18 and moving the moving claw 14 in lifting. The screw of the screw mechanism 16 is quickly rotated by the quick feeding manual rotation handle 20 in no-loading to quickly feed the moving claw 14. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a jack with a claw, and particularly to a jack with a claw 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, so that the hand cannot be released during the operation. In addition, since it is a tool that relies solely on human power, it is incapable of handling heavy objects exceeding several hundred kilograms.

  The pantograph jack for automobiles can be applied to heavy objects exceeding several hundred 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 jack with a claw having a structure in which the angle of a pair of links that intersect in an X shape having a claw is changed by a driving means. According to the jack with a claw, it is possible to raise a heavy object with a claw inserted into a narrow gap, and the risk of collapse of the load during operation is low.
Japanese Patent Laid-Open No. 2003-201092

  However, since the jack with a pawl described in Patent Document 1 employs a link structure, the rear dimension is longer than the pawl. For this reason, since a large space is required for the hoisting operation, there is a disadvantage that it is not easy to use in a narrow disaster site.

  An object of the present invention is to improve the above-mentioned drawbacks of the prior art and provide a jack with a claw suitable as a rescue tool for use in a compact disaster site that is compact and easy to use.

  In order to achieve the above object, a jack with a claw according to the present invention includes a fixed claw, a movable claw that can be moved to and away from the fixed claw, and a screw that moves the movable claw by the rotational force of the screw. A mechanism, a raising ratchet wrench for rotating the screw, and a quick-feeding hand turning handle for rotating the screw are provided, and the feed speed of the moving claw can be switched.

  Since the jack with a claw having the above configuration does not use a link structure, it can be made compact. In addition, since a ratchet wrench that requires a narrow operating range of the operating lever is used, it is convenient to use as a rescue tool used in a narrow disaster site. Further, as means for rotating the screw of the screw mechanism, a lifting ratchet wrench and a quick-feeding handwheel are provided. For this reason, a heavy object can be raised by rotating the screw | thread of a screw mechanism with a ratchet type wrench and moving a moving claw at the time of raising. When no load is applied, the screw of the screw mechanism can be quickly rotated by the fast-feeding hand turning handle to fast-forward the moving claw. Therefore, the operation of the jack can be switched according to the load, and the rescue operation can be quickly handled.

  FIG. 1 is an external perspective view showing a first embodiment of a claw jack according to the present invention, FIG. 2 is an exploded perspective view of the same embodiment, and FIG. 3 is an external perspective view of the same embodiment viewed from another angle. FIG. 4 is a side view showing the same embodiment in a triangular projection.

  The jack with a claw 10 mainly includes a fixed claw 12, a moving claw 14 that can be moved in and out of contact with the fixed claw 12, a screw mechanism 16 that moves the moving claw 14, and a screw that rotates the screw mechanism 16. A heavy ratchet wrench 18 and a fast-forwarding handle 20 for rotating the screw of the screw mechanism 16 are configured. The detailed structure will be described below.

  A pair of side plates 26 </ b> A and 26 </ b> B having long and narrow claw portions 24 on the bottom side are erected on both sides of the bottom plate 22, and a lower bearing 30 of a screw 28 extending in the vertical direction is fixed to the back center of the bottom plate 22. ing. The fixed claw 12 is formed by the tip portion of the bottom plate 22 and the claw portions 24, 24. The side plates 26A and 26B have guide grooves 32 in the vertical direction. The side plate 26A is taller than the side plate 26B, and one bearing 36 of the operation shaft 34 is supported on the upper side. A support plate 38 of the screw mechanism 16 is disposed at the top height of the side plate 26B so as to span between the side plates 26A and 26B, and supports the upper bearing of the screw 28. A bevel gear 40 is attached to the top of the screw 28. A nut 42 is engaged with the screw 28.

  Protruding pieces 44 are formed in the longitudinal direction on both side surfaces of the nut 42, and the protruding pieces 44 are fitted in the guide grooves 32 of the side plates 26A and 26B. From the lower part of the nut 42, the horizontal moving claw 14 extends integrally with the nut 42. The width | variety of the moving nail | claw 14 is taken as the dimension stored in the inner width between a pair of above-mentioned nail | claw parts 24. FIG. A side plate 26C that supports the other bearing 46 of the operating shaft 34 is disposed at a position facing the upper portion of the side plate 26A, and a top plate 48 is attached so as to span the side plate 26C and the top of the side plate 26A. A front cover 50 is attached so as to cover the front surfaces of the side plate 26C and the upper side plate 26A. Further, a rear cover 52 is attached so as to cover the rear surfaces of the side plates 26A, 26B, and 26C. A handle 54 is provided on the rear surface of the rear cover 52. The operation shaft 34 is provided with a bevel gear 56 that meshes with the bevel gear 40 at the top of the screw 28 at a right angle. A ratchet wrench 18 is provided at one end of the operation shaft 34 that protrudes toward the side plate 26C, and an operation shaft that protrudes toward the side plate 26A. A handwheel 20 is provided at the other end of 34.

  That is, in this jack with a claw 10, a gear box in which a sealed space surrounded by the side plate 26C above the support plate 38, the upper side plate 26A, the front cover 50 and the rear cover 52 is disposed in the bevel gear 40 and the bevel gear 56. It is said. A space surrounded on three sides by the lower side plate 26B, the lower side of the side plate 26A, and the lower side of the rear cover 52 is a drive area of the screw mechanism 16 including the screw 28 and the nut 42.

  In the claw jack 10 having the above-described configuration, when the operator rotates the operation shaft 34 by either reciprocating the lever 18A of the ratchet wrench 18 or rotating the handle 20 by hand, The rotation of 34 is transmitted to the bevel gear 40 that meshes with the bevel gear 56, and the screw 28 rotates. When the screw 28 rotates, the nut 42 engaged with the screw 28 is guided by the guide groove 32 and moves up and down. As a result, the moving claw 14 integrated with the nut 42 also moves up and down.

  FIG. 5 is an explanatory view illustrating a usage pattern of the claw jack 10 having the above-described configuration. As shown in FIG. 5 (1), the jack with a claw 10, for example, widens a narrow gap g between the ground 60 and the heavy object 62 to secure a rescue route for the victim confined in the deep part of the heavy object 62. Used. For this reason, in the first stage, the fixed claw 12 portion of the claw jack 10 brought in as shown in the figure is inserted into the gap g. In the second stage of FIG. 5 (2), an operator (not shown) quickly rotates the operating shaft 34 by the handwheel 20, thereby rapidly moving the moving claw 14 upward. As shown in the figure, when the upper surface of the moving claw 14 comes into contact with the heavy object 62, it becomes difficult to perform a fast-forwarding operation with the handwheel 20, so the operation is switched to a hoisting operation with the ratchet wrench 18. Note that the feed pawl of the ratchet wrench 18 is released during fast-forward operation by the handwheel 20, so that the lever 18A does not rotate together.

  In the third stage of FIG. 5 (3), the heavy object 62 is raised by the lifting operation by the ratchet wrench 18, and the gap G between the ground 60 and the heavy object 62 is secured. The operation of the lever 18A during the hoisting operation can be completed by a reciprocating operation within the range indicated by the arrow X, for example. Therefore, even if an obstacle exists outside this range, the lifting operation can be performed. When an obstacle is present within the range indicated by the arrow X, the lever 18A can be shifted to another angle to perform the lifting operation. As described above, the ratchet wrench 18 is employed as a means for rotating the operation shaft 34 at the time of lifting, so that the operation position and the operation range of the lever 18A can be arbitrarily selected according to the surrounding conditions. For this reason, it works particularly effectively at disaster sites where obstacles are scattered everywhere.

  If the lever 18A is a rotary handle arm, the lifting operation is impossible if there is an obstacle within a wide range indicated by the two-dot chain line Y. Therefore, in the illustrated case, the heavy object 62 itself becomes an obstacle for the handle operation, and thus the lifting operation is impossible.

  FIG. 6 is an explanatory view illustrating the usage pattern of the jack with jack 10 after the usage pattern shown in FIG. In the fourth stage of FIG. 6 (1), after the support material 64 is disposed in the gap secured between the ground 60 and the heavy object 62, the feed claw of the ratchet wrench 18 is switched in the reverse direction. Then, when the lever 18A is reciprocated to drop the heavy object 62 by a small amount, the load of the heavy object 62 shifts to the support member 64 side. Next, the moving claw 14 is lowered while being fast-forwarded by the hand turning handle 20, and the moving claw 14 is stored inside the fixed claw 12 as shown in FIG. 6 (2). The claw jack 10 thus freed is repeatedly used for the next lifting purpose.

  As above-mentioned, according to the jack 10 with a nail | claw of this embodiment, it is a structure which does not use a link structure, and can be manufactured compactly. Further, since the ratchet wrench 18 having a narrow operating range of the lever 18A is used, it is convenient as a rescue tool used in a narrow disaster site. Further, as means for rotating the screw 28 of the screw mechanism, a lifting ratchet wrench 18 and a quick-feeding handwheel 20 are provided. For this reason, the heavy object 62 can be raised by rotating the screw 28 of the screw mechanism 16 by the ratchet wrench 18 and moving the moving claw 14 at the time of raising. When no load is applied, the screw 28 of the screw mechanism 16 can be quickly rotated by the fast-forwarding hand-operating handle 20 and the moving claw 14 can be fast-forwarded. Accordingly, the operation of the claw jack 10 can be switched according to the load, and the rescue operation can be quickly handled.

  FIG. 7 is an external perspective view showing a second embodiment of a jack with a claw according to the present invention. In FIG. 7, elements denoted by the same reference numerals as those in FIGS. 1 to 3 are the same as those in the first embodiment, and a description thereof will be omitted. In this embodiment, the handwheel handle 20 is provided on the same side plate 26B side as the ratchet wrench 18, and the side plate 26A on the opposite side of the side plate 26B has no projection. The jack with a claw 10 </ b> A having this configuration is used, for example, with the claw jack 10 </ b> A placed on its side with the ratchet wrench 18 or the side plate 26 </ b> B on which the hand-turning handle 20 is attached as an upper surface, and moves a heavy object laterally. Therefore, it is suitable for an application for widening the distance between the heavy object and the wall.

  FIG. 8 is an external perspective view showing a third embodiment of a jack with a claw according to the present invention. In FIG. 7, elements denoted by the same reference numerals as those in FIGS. 1 to 3 are the same as those in the first embodiment, and a description thereof will be omitted. In the present embodiment, the ratchet wrench 18 and the handwheel handle 20 are provided on the top plate 48 side. In the jack with claws 10B having this configuration, the operation shaft and the screw described in the first embodiment can be formed by the same shaft, so that the bevel gear 40 and the bevel gear 56 described in the first embodiment can be omitted. In addition, the structure can be reduced in size and weight.

It is an appearance perspective view showing a 1st embodiment of a jack with a claw concerning the present invention. It is a disassembled perspective view of the same embodiment. It is the external appearance perspective view which looked at the same embodiment from another angle. It is each surface figure which showed the same embodiment by the triangular projection. It is explanatory drawing which illustrated the usage pattern of the same embodiment. It is explanatory drawing which illustrated the usage pattern after FIG. 5 of the embodiment. It is an external appearance perspective view which shows 2nd Embodiment of the jack with a nail | claw which concerns on this invention. It is an external appearance perspective view which shows 3rd Embodiment of the jack with a nail | claw which concerns on this invention.

Explanation of symbols

10, 10A, 10B ......... Jack with claw, 12 ......... Fixed claw, 14 ......... Moving claw, 16 ......... Screw mechanism, 18 ......... Ratchet wrench, 18A ......... Lever, 20 ... ... Handwheel, 22 ......... Bottom plate, 24 ......... Claw, 26A, 26B, 26C ......... Side plate, 28 ......... Screw, 30 ......... Lower bearing, 32 ......... Guide groove, 34 ... ... Operation shaft, 36 ...... Bearing, 38 ......... Support plate, 40 ......... Bevel gear, 42 ......... Nut, 44 ......... Projection piece, 46 ......... Bearing, 48 ......... Top plate, 50 ......... Front cover, 52 ......... Rear cover, 54 ......... Handle, 56 ......... Bevel gear, 60 ......... Ground, 62 ......... Heavy object, 64 ...... Support material.

Claims (1)

  A fixed claw, a movable claw that can be moved toward and away from the fixed claw, a screw mechanism that moves the movable claw by a rotational force of a screw, a ratchet wrench for lifting the screw, A jack with a claw, characterized in that it comprises a fast-turning handwheel for rotating a screw, and the feed speed of the moving claw can be switched.

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