JP2016132560A - Pantograph type jack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pantograph type jack excellent in productivity, smoothness of lifting function and storage performance even with a short screw rod by improving the part of a female screw metal.SOLUTION: In a pantograph type jack where a cargo receiving deck and a base are arranged vertically with right, left, and upper arms coupled in a pantograph shape with right, left, and lower arms by a left side coupling member and a right side coupling member, and a screw rod extended between both the left side coupling member and the right side coupling member to make the cargo receiving deck move vertically with respect to the base by expanding and contracting both the left side coupling member and the right side coupling member by rotation of the screw rod, the left side coupling member is provided in a female screw auxiliary cylinder with a female screw shaft constituting the support shaft part of the same and a female screw auxiliary cylinder having a female screw part in the extension part on the right side coupling member side, and a whirl-stop frame serving as the whirl-stop against the female screw.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a pantograph jack, and more particularly to a screw rod and a screw metal screwed to the screw rod.

  In Patent Document 1, in a screw mechanism of a screw rod in a pantograph jack, a screwing portion 22 having a female screw 24 provided for screwing a male screw of a screw rod B is opposite to the screwing portion 22. A pivot portion 23 provided with pins 8 and 8 pivotally supporting the respective ends of the lower support rod 3 and the upper support rod 6 constituting one side of the pantograph mechanism at the side end portion, the screwing portion 22 and the pivot portion A screw receiving mechanism A is constituted by a main body 20 integrally formed of a steel pipe or a steel plate strip as a material with a distance section of a desired length between and an arm portion 21 as an arm portion 21. The screw receiving mechanism A A pantograph jack is disclosed in which the full length of the screw rod B can be screwed together to form the entire length of the screw rod of the required length.

  In Patent Document 2, in a pantograph jack, an extension pipe (20) is provided at a joint (9) of a pandagraph, and a threaded ring (27) is extended toward a short screw (11) of the jack. A pantograph jack is disclosed which has a unitary structure and is positioned on the joint by caulking the tab around the joint trunnion (21).

Japanese Utility Model Publication No. 57-106696 JP-A-7-106696

Since Patent Document 1 includes the screw rod B and the screw receiving mechanism A configured as described above, the screw rod B can be provided as short as possible, and the screwed end side of the screw rod B is disposed outside the arm. It can be folded and stored in a state where it does not protrude from the end, but the pin 8 that pivotally supports the arm in the screw receiving mechanism A is interrupted in the middle and the pivoting portion 23 is formed, so that it becomes a weak point in strength. There is a drawback that the mechanism is complicated and incurs high costs.

As described above, the first joint of the first and third arms of the pantograph is formed in an open jaw, and the jaws are tightened around an integral trunnion of the extension means, and the first and third arms are combined. An extension means is rotatably attached to the jaw of the third arm. Therefore, since the whole extending means is integral, there are a drawback that it must be made of die-cast and a manufacturing process for tightening the opening jaws of the first and third arms.

An object of the present invention is to provide a pantograph jack that can improve the storage efficiency of a pantograph jack without reducing the stroke of jack-up.

A typical pantograph-type jack having a structure as shown in FIG. 7 is mainly commercially available. When this is used, the screw rod 28 protrudes from the female screw metal 26 connecting the upper left arm 22a and the lower left arm 24a, and when mounted on the vehicle. It is in the way.

The present invention proposes a pantograph jack that improves the female screw metal 26 and is excellent in productivity, smoothness of the lifting function and storage performance even if the screw rod 28 is short.

The load receiving base and the base are arranged vertically, and the left and right upper arms and left and right lower arms are connected in a pantograph shape by the left connecting member and the right connecting member, and screw rods are inserted between the left connecting member and the right connecting member. In the pantograph-type jack in which the left and right connecting members are expanded and contracted by rotation of the screw rod and the load receiving table is moved up and down with respect to the base, the left connecting member constitutes a supporting shaft portion thereof. A pantograph-type jack in which a female screw auxiliary cylinder having a female screw part at an extension part on the right connecting member side and a non-rotating frame that prevents rotation with respect to the female screw axis is provided on the female screw auxiliary cylinder. .

The female screw shaft may be a two-surface parallel round bar body that is equidistant from the center by a parallel surface facing the outer peripheral surface of the round bar, and may be formed with a through hole through which the screw bar passes. It is.

The female threaded auxiliary cylinder body is provided with a bearing hole for inserting the female threaded shaft at one end thereof, and a female threaded part and a female threaded part for screwing the threaded rod from the tip into the extended projecting end of the other end. A passage hole through which the screw rod advances and retreats at one end may be formed.

The anti-rotation frame is provided with a square plate material in a U-shape in which both side portions are bent with the central portion left in a square shape, and the side plate portions on both sides are provided with anti-rotation holes. The female screw shaft is inserted and held in a non-rotatable manner, and the protrusions protruded by means of caulking or the like in the side plate portions on both sides are inserted into the concave portions provided corresponding to the front and rear of the outer peripheral surface of the female screw auxiliary cylinder. It may be fixed.

An opening through which a screw rod passes may be formed at the center of the rotation stop frame.

The male screw portion of the screw rod is screwed into the female screw portion of the female screw auxiliary cylinder constituting the left connecting member of the pantograph jack of the present invention, and the tip can be made shorter than the conventional screw rod. It can be folded into a retracted state without projecting outward from the center of the rotation stop frame.

Since the left connecting member of the pantograph jack of the present invention is configured as described above, the male screw portion of the screw rod is screwed into the female screw portion of the female screw auxiliary cylinder, and compared with the conventional screw rod. It can be configured to be short, and can be folded into a retracted state without protruding the tip from the central portion of the detent frame to the outside.

The female screw shaft constituting the left connecting member of the pantograph-type jack of the present invention is a two-sided parallel round bar body whose outer peripheral surface is cut away at an equal distance from the center of the round bar, and a conventional female screw hole portion. Is formed in the passage hole, in a state where the female screw shaft is fitted and inserted into the rotation hole of the side plate portion of the rotation stop frame, it is held by the rotation stop frame and is held at a fixed position integral with the female screw auxiliary cylinder, There is no collision with the screw rod.

For the female screw auxiliary cylinder constituting the left connecting member of the pantograph jack of the present invention, the rotation frame has a recess formed on the outer peripheral surface of the female screw auxiliary cylinder and the corresponding part of the side plate portion of the rotation frame is pressed. Since it is plunged by pressing means and both are fixed, it can be firmly integrated in a simple process.

It is a front view which shows the expansion | extension state of the pantograph type jack of this invention. Similarly, it is an expanded sectional view of the principal part of the present invention. Similarly, it is an expansion exploded view of the internal thread metal of the principal part of this invention. Similarly, it is an expansion assembly perspective view of the internal thread metal of the principal part of this invention. Similarly, it is an expansion assembly top view of the internal thread metal of the principal part of this invention. It is an expanded sectional view which follows the AA line of FIG. It is a front view which shows the expansion | extension state of the conventional pantograph type jack. It is an expanded sectional view which follows the BB line of FIG.

The load receiving base and the base are arranged vertically, and the left and right upper arms and left and right lower arms are connected in a pantograph shape between them, and screw rods are passed between the two connecting portions. In the pantograph-type jack that expands and contracts and raises and lowers the load receiving table with respect to the base, the left connecting member includes a female screw shaft that forms a supporting shaft portion thereof, and a female screw auxiliary portion that includes a female screw portion on an extension portion on the right connecting member side. A cylindrical body and a rotation stop frame that prevents rotation with respect to the female screw shaft are provided in the female screw auxiliary cylindrical body, and the female screw shaft is cut at an equal distance from the center by a parallel surface facing the outer peripheral surface of the round bar. In addition to being a two-side parallel round bar, a through hole is formed through which a threaded rod passes. The female threaded auxiliary cylinder is provided with a bearing hole transversely inserted into one end of the female threaded auxiliary cylinder, and the other end is extended. Female thread part that screwes the screw rod into the protruding end from the tip A threaded rod is formed to advance and retreat from the female threaded portion to one end, and the rotation frame is a U-shaped shape in which the side plate faces each other by bending the both sides while leaving the center plate in a square shape. The side plate portions on both sides are provided with anti-rotation holes so that the female screw shaft is non-rotatably fitted and held, and the both side portions are provided in recesses corresponding to the front and rear of the outer peripheral surface of the female screw auxiliary cylinder. A pantograph-type jack in which a protruding portion that is protruded by means of caulking or the like is fitted and fixed in the side plate portion, and an opening through which a screw rod passes is formed at the center portion of the anti-rotation frame.

Hereinafter, the pantograph type jack 1 of the present invention will be described with reference to the embodiments shown in the drawings. The pantograph type jack 1 of the embodiment has a left upper arm 2a and a right upper arm 2b, a load receiving frame 3 at the upper end, and support shafts 3a, 3b. The tooth portions 2a1 and 2b1 are engaged with each other and connected.

In the pantograph-type jack 1, a lower left arm 4a and a lower right arm 4b are connected to a base 5 at the lower end by a support shaft 5a, 5b and meshed with tooth portions 4a1, 4b1.

A bearing hole 2a2 and a bearing hole 4a2 are formed at the lower end of the left upper arm 2a and the upper end of the left lower arm 4a, and the end portions of the bearing holes 2a2 and 4a2 are overlapped with the same axis, respectively. The female screw shaft 9 constituting the support shaft portion of the left connecting member 6 is inserted into the bearing holes 2a2 and 4a2 so that the left upper arm 2a and the left lower arm 4a are rotatably connected.

The lower end of the right upper arm 2b and the upper end of the right lower arm 4b are provided with bearing holes similar to the bearing hole 2a2 and the bearing hole 4a2, respectively, and the respective end portions are overlapped to form a right connecting member in each bearing hole. 7, the right upper arm 2b and the right lower arm 4b are rotatably connected.

A screw rod 8 is passed between the left connecting member 6 and the right connecting member 7, and an engaging portion 8 a for engaging a hook (not shown) of a rotating handle is provided on the proximal end side of the screw rod 8.

The screw rod 8 is formed with thrust receiving portions 8c and 8d at a base end side with a required interval, and the thrust receiving portions 8c and 8d are connected to both side surfaces of the right connecting member 7 to be connected to the screw rod 8. Is rotated with respect to the right connecting member 7, the male screw portion 8 b is formed on the outer diameter surface of the screw rod 8 on the outer diameter surface, and is screwed into the female screw portion 10 b of the left connecting member 6. The left connecting member 6 is advanced and retracted, the distance between the left connecting member 6 and the right connecting member 7 is expanded and reduced, and the load receiving table 3 is moved up and down with respect to the base 5.

The left connecting member 6 includes a female screw shaft 9 constituting a supporting shaft portion thereof, and a female screw portion 10b at an extension portion on the right connecting member 7 side, and a passage of the screw rod 8 between one end and the female screw portion 10b. A female screw auxiliary cylinder 10 formed in the hole 10a and a rotation stop frame 11 that prevents the female screw shaft 9 from rotating relative to the female screw auxiliary cylinder 10 are provided.

The female screw shaft 9 is a two-surface parallel round bar body that is cut at an equal distance from the center by a parallel surface facing the outer peripheral surface of the round bar, and a female screw hole having a conventional structure passes through the screw rod 8. It is formed and provided in the through hole 9a.

The female screw auxiliary cylinder 10 is provided with a bearing hole 10c, which is inserted into the female screw shaft 9, near one end thereof, across the passage hole 10a.

The anti-rotation frame 11 is provided in a U-shaped shape in which both side portions are bent so that the side plate portions 11b and 11b face each other, with a plate portion such as a rectangular steel plate left in a square shape at the center portion 11a. The side plate portions 11b and 11b are provided with anti-rotation holes 11b1 and 11b1 so that the female screw shaft 9 is non-rotatably fitted and held, and the concave portions provided opposite to the outer peripheral surface of the female screw auxiliary cylinder 10 Projections 11b2 and 11b2 projecting by means such as caulking on the side plate portions 11b and 11b on both sides are fitted and fixed to 10d and 10d, and an opening 11a1 through which the screw rod 8 passes is formed in the central portion 11a of the rotation stop frame 11. It is established.

The external shape of the female screw shaft 9 and the anti-rotation hole 11b1 of the anti-rotation frame 11 are not limited to the shape of the embodiment because the purpose is to keep the female screw shaft 9 from rotating.

FIG. 7 is a front view of a conventional general pantograph-type jack 21. The left upper arm 22a and the right upper arm 22b are pivotally supported by the load receiving frame 23 at the upper end by the support shafts 23a and 23b. At the same time, the tooth portions 22a1 and 22b1 are engaged with each other, and the left lower arm 24a and the right lower arm 24b are pivotally supported by the support shafts 25a and 25b on the base 25 at the lower ends, and the tooth portions 24a1 and 24b1 As shown in FIG. 8, a bearing hole 22a2 and a bearing hole 24a2 are formed at the lower end of the left upper arm 22a and the upper end of the left lower arm 24a, respectively, and each end is a bearing hole 22a2. , 24a2 are superposed on the same shaft center, and the support shaft portion 26a of the left connecting member 26 is inserted into the respective bearing holes 22a2, 24a2 so that the left upper arm 22a and the left lower arm 24a is coupled rotatably.

The lower end of the right upper arm 22b and the upper end of the right lower arm 24b of the general pantograph jack 21 are similarly provided with bearing holes similar to the bearing holes 22a2 and 24a2 shown in FIG. The portions are similarly overlapped, and the support shaft portion 27a of the right connecting member 27 is inserted into each bearing hole, so that the right upper arm 22b and the right lower arm 24b are rotatably connected.

As shown in FIG. 7, a screw rod 28 is passed between the left connecting member 26 and the right connecting member 27 of the general pantograph jack 21, and a hook of a rotating handle is hooked on the base end side of the screw rod 28. An engagement portion 28a for engaging (not shown) is provided.

As shown in FIG. 7, the screw rod 28 of the general pantograph jack 21 is formed with thrust receiving portions 28c, 28d on the base end side with a required interval, and the thrust receiving portions 28c, 28d are The rotation position of the screw rod 28 relative to the right connection member 27 is restricted by being connected to both side surfaces of the right connection member 27, and as shown in FIG. 8, a male screw portion 28b is formed on the outer diameter surface of the screw rod 28. And is screwed into the female thread portion 26c of the left connecting member 26.

In the pantograph jack 1 of the present invention, the left connecting member 26 is advanced and retracted by the rotation of the screw rod 28, the distance between the left connecting member 26 and the right connecting member 27 is expanded and reduced, and the load receiving table 23 is raised and lowered with respect to the base 25. .

The screw rod 8 of the pantograph-type jack 1 of the present invention can be configured shorter than the conventional screw rod, and can be stored in a retracted state without causing the tip to protrude greatly outward from the central portion 11a of the locking frame 11. Can be folded.

The female screw shaft 9 constituting the left connecting member 6 of the pantograph jack 1 of the present invention is a two-surface parallel round bar body whose outer peripheral surface is cut away at an equal distance from the center of the round bar, and this female screw shaft 9. Since the through-hole 9a penetrating through is formed, in the state where the female screw shaft 9 is fitted and inserted into the anti-rotation holes 11b1 and 11b1 of the side portions 11b and 11b of the anti-rotation frame 11, the auxiliary screw is inserted through the anti-rotation frame 11. The cylindrical body 10 is held at a fixed position, and the through hole 9a of the female screw shaft 9 is also held at the fixed position, so that the screw rod 8 can be advanced and retracted without colliding.

In the pantograph jack 1 according to the present invention, the rotation stop frame 11 has a recess 10 d formed on the outer peripheral surface of the internal thread auxiliary cylinder 10 with respect to the internal thread auxiliary cylinder 10, and the corresponding portions of the side plates 11 b and 11 b of the rotation stop frame 11. Since 11b2 and 11b2 are plunged by pressing means such as pressing and both are fixed, they can be firmly integrated in a simple process.

The pantograph-type jack of the present invention is an improved pantograph-type jack which improves the female screw metal part of this type of conventional jack and can shorten the screw rod, and is excellent in smoothness of the lifting function, folding storage performance and productivity. Can provide.

1 Pantograph-type jack 2a Left upper arm 2a1 Tooth part 2a2 Bearing hole 2b Right upper arm 2b1 Tooth part 3 Loading frame 3a Support shaft 3b Support shaft 4a Left lower arm 4a1 Tooth part 4a2 Bearing hole 4b Right lower arm 4b1 Tooth part 5 Base 5a Support shaft 5b Support shaft 6 Left connection member 7 Right connection member 7a Support shaft portion 8 Screw rod 8a Engagement portion 8b Male screw portion 8c Thrust receiving portion 8d Thrust receiving portion 9 Female screw shaft 9a Through hole 10 Female screw auxiliary cylinder 10a Passage Hole 10b Female thread portion 10c Bearing hole 10d Recess 11 Rotation stop frame 11a Central portion 11a1 Open hole 11b Side plate portion 11b1 Rotation stop hole 11b2 Projection

Claims (5)

The load receiving base and the base are arranged vertically, and the left and right upper arms and left and right lower arms are connected in a pantograph shape by the left connecting member and the right connecting member, and screw rods are inserted between the left connecting member and the right connecting member. In the pantograph-type jack in which the left and right connecting members are expanded and contracted by rotation of the screw rod and the load receiving table is moved up and down with respect to the base, the left connecting member constitutes a supporting shaft portion thereof. A pantograph-type jack in which a female screw auxiliary cylinder having a female screw part in an extension on the right side connecting member side and a rotation-stopping frame that prevents rotation with respect to the female screw shaft are provided on the female screw auxiliary cylinder. 2. The female screw shaft according to claim 1, wherein the female screw shaft is a two-surface parallel round bar body cut at an equal distance from the center by a parallel surface opposed to the outer peripheral surface of the round bar, and a passage hole through which the screw bar passes is formed. Pantograph jack. The female threaded auxiliary cylinder body is provided with a bearing hole for inserting the female threaded shaft at one end thereof, and a female threaded part and a female threaded part for screwing the threaded rod from the tip into the extended projecting end of the other end. The pantograph jack according to claim 1 or 2, wherein a through-hole through which the screw rod advances and retreats is formed at one end. The anti-rotation frame is provided with a square plate material in a U-shape in which both side portions are bent with the central portion left in a square shape, and the side plate portions on both sides are provided with anti-rotation holes. The female screw shaft is inserted and held in a non-rotatable manner, and the protrusions protruded by means of caulking or the like in the side plate portions on both sides are inserted into the concave portions provided corresponding to the front and rear of the outer peripheral surface of the female screw auxiliary cylinder. The pantograph jack according to claim 1, 2 or 3, which is fixed. The pantograph jack according to claim 4, wherein an opening through which a screw rod passes is formed in a central portion of the rotation stop frame.

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