JP6541382B2 - jack - Google Patents

Description

  The present invention relates to a jack for supporting a support target such as a work or a stand, and more particularly to a jack having a screw mechanism for leveling adjustment of the installation height of the support target.

  Conventionally, for example, when processing a work, several places on the lower surface of the work are usually supported by small jacks called "bean jacks", and these jacks adjust the leveling of the work, while the upper surface of the end of the work Is held by one end of the clamp (press fitting) and the other end of the clamp is supported by another jack, and after adjusting the level of the clamp by this jack, the through hole provided in the central part of the clamp A work is fixed by pressing a nut screwed to an upper end portion of a bolt whose lower end is supported by a pedestal or the like by pressing the upper surface of the clamp.

  As such a jack, as described in the prior art in Patent Document 1, a cylindrical main body provided with a female screw portion in the vertical direction at the central portion and a support head at the upper end are integrally provided. There is widely known a jack which is composed of a lifting screw rod and which is screwed to a female screw portion of the main body so as to be movable back and forth.

  Further, in Patent Document 2, a main body (fixed portion) provided with a screw portion in the central portion in the vertical direction, an elevation screw rod integrally provided with a disc-shaped operation head at the upper end, and an upper surface It consists of a disk-shaped head portion formed on the work support surface, and the elevating screw rod is screwed on the female screw portion of the main body so as to be able to advance and retract, and a bearing is mounted on the operation head of the elevating screw rod. There is disclosed a jack in which the head portion is rotatably supported around the central axis of the operation head.

JP, 2002-87764, A JP, 2011-131945, A

  When the jack described in Patent Document 1 is used to support a work, an elevation screw rod screwed into the female screw portion of the main body is moved up and down by the rotation operation of the support head to support the work on the support head. Since the leveling adjustment is performed, friction may occur between the upper surface of the support head supporting the workpiece and the lower surface of the workpiece in contact with the upper surface, which may damage the workpiece. In addition to the above, there has been a problem that the support position of the jack itself is shifted due to the above-mentioned frictional force, and the leveling adjustment can not be accurately performed.

  Furthermore, since the leveling adjustment of the work is performed by rotating the support head that supports the lower surface of the work, the lower surface of the work interferes with the rotation operation of the support head, and the jack is the work and this jack As a result of being disposed in a narrow space between the base and the base, the leveling adjustment can not be smoothly performed.

  On the other hand, according to the jack described in Patent Document 2, since the head portion for supporting the work via the bearing is disposed on the operation head of the elevation screw rod, the elevation screw is operated by the rotation operation of the operation head. If leveling adjustment is performed by raising and lowering the rod, there is no possibility that the head portion supporting the workpiece will rotate, and therefore there is no risk of damaging the lower surface of the workpiece or shifting of the jack itself. .

  However, since the head portion for supporting the work is always disposed on the operation head of the lift screw via the bearing, the operation head is also at a height position close to the lower surface of the work. As a result, the operation head may not be able to be rotated smoothly, and when the operator grips the operation head of the lifting screw and rotates it, the head may also be gripped together. There is.

  Also, in any of the above jacks, the height of the work supporting surface of the support head and the head portion is adjusted only by the raising and lowering screw rod screwed into the female screw portion of the main body. The problem that the height to support, that is, the stroke of the work support surface moving upward from the main body is limited to a relatively short length, and the stroke becomes shorter if the lock nut is screwed to the raising and lowering screw rod There was a point.

  Furthermore, the load of the work is directly supported through the support head and the head by the screwing portion between the raising and lowering screw and the female screw of the main body, and the pitch of the male screw of the raising and lowering screw Since the elevating distance is set, the elevating distance when rotating the elevating screw 一 is long, and when rotating the elevating screw し て to lift the workpiece, only a relatively large operating force is required. In addition, there is a problem that the stroke and leveling can not be easily finely adjusted.

  The present invention has been made in view of such problems, and the object of the present invention is to support an object such as a work without damaging the object to be supported, as well as to facilitate the operation of the object to be supported Therefore, the present invention provides a jack that can be pushed up with a large stroke, and can perform leveling adjustment easily and precisely.

  In order to achieve the above object, the jack according to the present invention is, as described in claim 1, a cylindrical main body provided with an open female screw portion directed upward, and a female screw portion of this cylindrical main body on the outer peripheral surface. An axial cylindrical shape provided with a screwed male screw portion and integrally provided with an operation head at the upper end, and provided at the center with a female screw portion opening upward from the upper surface of the operation head (1) A raising and lowering screw and a second raising and lowering screw provided with an external thread screwed to the internal thread of the first raising and lowering screw on the outer peripheral surface and integrally provided with a support head at the upper end, The pitch of the male screw portion of the second raising and lowering screw rod screwed to the female screw portion provided on the first raising and lowering screw rod than the pitch of the male screw portion of the first raising and lowering screw rod screwed to the female screw portion of the cylindrical main body It is characterized by being smaller.

Furthermore, according to the present invention , a female screw portion in which a first lifting screw is screwed is formed on the inner peripheral surface of the upper end opening of the cylindrical main body , and an inner and outer periphery is formed on the upper end portion forming the female screw. It is characterized in that a screw hole penetrating between the surfaces is provided, and a pressing piece of a lock piece for locking the first lifting screw rod is screwed in and retractably into this screw hole.

Further, according to the present invention, a female screw portion vertically penetrating through the upper surface of the operation head from the upper surface of the operation head to the inside of the first lifting screw is formed at the center of the upper end of the first lifting screw A second elevation screw screw is screwed into the female screw portion, and a screw hole is provided in the operation head so as to extend between the inner and outer peripheral surfaces of the operation head, and the screw hole is formed characterized in that it is screwed retractably pressing piece of the lock piece to lock the second lift threaded rod into the screw hole.

  According to the first aspect of the present invention, the first up-and-down threaded screw in axial cylindrical shape screwed to the female screw portion provided in the tubular main body in the up and down direction and the center part of the first up-and-down screw The second raising and lowering rod screwed to the provided female screw part is provided, the operation head is provided at the upper end of the first raising and lowering screw rod, and the supporting head of the support object is provided at the upper end of the second raising and lowering screw rod. Even if the stroke from the cylindrical main body to the support head can be set long and the distance of the space between the support object and the base is larger than the length of the first lifting screw, the spacer etc. It is possible to support the support object without interposing the

  Further, a second lifting screw provided with a supporting head of the object to be supported projects upward from the first lifting screw and operates the operating head to raise and lower the supporting head to the upper end of the first lifting screw. The operation head is disposed at an intermediate position between the support head and the cylindrical main body, and therefore, even in the narrow space between the support object on which the jack is installed and the base Since the lower surface of the object to be supported and the support head supporting the object to be supported do not interfere with the operation, the user can hold the operation head and perform the rotation operation smoothly, and the leveling adjustment becomes easy. .

  In addition, even if the operation head is turned, the support head supporting the support object is fixed by the frictional force with the support object. (1) It is possible to screw and unscrew the female screw portion provided on the lifting screw in accordance with the rotation of the operation head, and to prevent the generation of the abrasion of the lower surface of the support object due to the rotation of the support head. .

  Furthermore, the external thread of the second elevation screw thread screwed to the internal thread portion provided on the first elevation screw thread than the pitch of the external thread portion of the first elevation screw thread engaged to the internal thread portion of the cylindrical main body Since the pitch of the parts is reduced, the supporting head of the second lifting screw supporting the object to be supported is the first even if the operating head is rotated to raise or lower the first lifting screw. Only the distance between the pitch of the external thread of the lifting screw and the pitch of the external thread of the second lifting screw is raised and lowered, so that the rotation of the operating head for raising and lowering the support head with relatively light operating force Not only the operation can be performed, but also the fine adjustment of the stroke of the support head with respect to the cylindrical main body and the leveling of the support object becomes possible, and the support object can be fixed with high accuracy.

Furthermore, according to the present invention , the cylindrical main body is formed with a female screw portion in which a first raising and lowering screw thread is screwed on the inner peripheral surface of the upper end opening, and the upper end forming the female screw portion Use a lock nut because a screw hole penetrated between the inner and outer peripheral surfaces is formed in the part, and the pressing piece of the lock piece that locks the first lift screw in this screw hole is screwed back and forth freely. The lock piece can be pressed against the first raising and lowering screw rod to lock the first raising and lowering screw rod by screwing the pressing piece screwed into the screw hole provided at the upper end of the main body. 1) The stroke of the lifting screw can be used effectively.

Further , according to the present invention , the first cylindrical lifting and lowering screw rod has a female screw portion vertically penetrating the upper surface of the operation head from the upper surface of the operation head to the inside of the first lifting screw rod. While forming and screwing a second raising and lowering screw rod into the female screw portion, the operating head is provided with a circular hole penetrating between the inner and outer peripheral surfaces of the operating head, and the circular Since the pressing piece of the lock piece for locking the second lifting screw is screwed on and off freely in the screw hole formed in the hole, the operation is performed without using the lock nut as in the case of the first lifting screw. By screwing the pressing piece screwed into the screw hole provided in the head, the lock piece can be pressed against the second lifting screw and the second lifting screw can be locked, and the second lifting The stroke of the screw rod can also be used effectively

The front view of this invention jack. The vertical front view. Perspective view. An exploded perspective view. The perspective view of the contracted state. The longitudinal front view of the contracted state. The simplified front view which shows use condition. The front view of the state which is performing the leveling adjustment. The front view of the state which is performing lock operation.

  A concrete embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 to 4, the jack J has a cylindrical main body 1 provided with a female screw portion 2 opened upward from its upper surface at the upper end; An external thread 4 is formed on the outer peripheral surface of the cylindrical main body 1 by screwing with the internal thread 2 of the cylindrical main body 1, and a disk-shaped operating head 5 is integrally provided on the upper end. A cylindrical barrel-shaped first raising and lowering screw rod 3 provided with a female screw 6 opened upward from the upper surface of 5 and an external thread screwed to the female screw 4 of the first raising and lowering screw rod 3 on the outer peripheral surface 8 and a second raising and lowering screw rod 7 integrally provided with a disk-shaped support head 9 at the upper end, the first screw screwed to the female screw portion 2 of the cylindrical main body 1 The first lift screw 3 is provided with the pitch of the male screw 4 of the lift screw 3 The pitch of the male screw portion 7 of the second lifting screw rod 7 screwed on the threaded portion 6 is made smaller.

  Specifically, the cylindrical main body 1 is formed in a cylindrical shape in which the upper and lower surfaces are formed flat and can function as a pedestal, and the length (height) of the cylindrical main body 1 is the first elevation A circular hole 10 which is longer than the length of the screw rod 3 and which penetrates between the upper and lower surfaces is provided at the center thereof and the upper end opening of the circular hole 10 is formed smaller in diameter than the circular hole 10 The female screw portion 2 of small diameter is engraved on the inner peripheral surface, and as shown in FIG. 6, the first lifting screw rod 3 is screwed out along the female screw portion 2 so that the lower surface of the operation head 5 is The first raising and lowering screw rod 3 is configured to be accommodated in the cylindrical main body 1 over the entire length when it is lowered until it abuts on the upper surface of the cylindrical main body 1 and is received.

  Furthermore, a small diameter screw hole 11 penetrating horizontally between the inner and outer peripheral surfaces of the upper end portion is provided at the upper end portion forming the female screw portion 2 of the cylindrical main body 1. The lock piece 12a smaller in diameter than the screw hole 11 is loosely fitted on the back side of the lock piece 12a, and a pressure piece 12b screwed back and forth to the screw hole 11 is disposed on the back side of the lock piece 12a. By screwing the piece 12b forward, the lock piece 12a is pushed forward and its leading end face is crimped to the outer peripheral surface of the first raising and lowering screw rod 3 screwed to the female screw portion 2 of the cylindrical main body 1 It is configured to lock the 杆 3. The lower end portion outer peripheral surface of the first raising and lowering screw rod 3 is in contact with the lower end surface of the female screw portion 2 connected to the upper end of the screw hole 11 of the cylindrical main body 1. A retaining ring 13 is provided for preventing the vehicle from coming out of the vehicle.

  Like the cylindrical main body 1, the first lifting screw rod 3 has a circular hole 14 having a diameter smaller than that of the circular hole 10 of the cylindrical main body 1 penetrating in the center between the upper and lower surfaces thereof. At the same time, the upper end opening of the circular hole 14 is formed smaller in diameter than the circular hole 14, and the above-mentioned internal thread 6 is engraved on the inner peripheral surface thereof. Furthermore, at the center of the operation head 5 integrally provided at the upper end of the first raising and lowering screw rod 3, a female screw having the same diameter as the female screw 6 and having the lower end connected to the upper end of the female screw 6 The section 6 'is engraved. That is, the female screw portion 6, 6 'in which the second lifting screw 7 is screwed from the center of the upper surface of the operation head 5 to the upper end of the circular hole 14 in the center of the first lifting screw 3 is It is engraved.

  The length from the upper surface of the operation head 5 to the lower end of the circular hole 14 in the first lifting screw rod 3 is longer than the length of the shaft portion provided with the male screw 8 of the second lifting screw rod 7 Formed so that, as shown in FIG. 6, the second lifting screw 7 is screwed out along the female threads 6, 6 'of the first lifting screw 3 so that the lower surface of its support head 9 When lowering until it is joined so as to overlap on the upper end operation head 5 of the lifting screw rod 3, the shaft portion of the second lifting screw rod 7 extends over the entire length in the circular hole 14 of the first lifting screw rod 3. Is configured to be stored.

  Furthermore, similarly to the cylindrical main body 1, the operating head 5 of the first lifting screw rod 3 is provided between the outer peripheral surface of the operating head 5 and the inner peripheral surface provided with the female screw 6 ′. A small-diameter circular hole 15a penetrating horizontally is provided, and an inner peripheral surface on the back side of the circular hole 15a is formed as a screw hole 15b. The screw hole is formed on the back side of the screw hole 15b. A lock piece 16a having a diameter smaller than that of the portion 15b is loosely fitted, and a pressure piece 16b screwed back and forth to the screw hole 15b is disposed on the back side of the lock piece 16a, and the pressure piece 16b is screwed The lock piece 16a is pushed forward by pressing it, and the second raising and lowering screw is made by pressing the tip end face thereof onto the outer peripheral surface of the second raising and lowering screw 7 screwed to the female screw 6 and 6 'of the first raising and lowering screw 3 It is configured to lock 杆 7. Also in the second raising and lowering screw rod 7, the second raising and lowering screw rod 7 is in contact with the lower end surface of the female screw portion 6 connected to the upper end of the screw hole 14 of the first raising and lowering screw rod 3 on the outer peripheral surface of the lower end portion. A retaining ring 17 is mounted for preventing the first lifting screw 3 from coming off.

  Further, at the outer peripheral portion of the upper end support head 9 of the second lift screw 7, a tip end of a handle shaft (not shown) for rotating the second lift screw 7 with a predetermined interval in the circumferential direction. A locking hole 19 is formed for inserting and locking the part. The above-mentioned circular hole 15a drilled on the outer peripheral surface of the operation head 5 is used as a locking hole provided on the side of the first lift screw 3. Further, the outer peripheral surface of the operation head 5, the support head 9, and the cylindrical main body 1 is knurled to be a slip stopper such as a fingertip.

  Next, the usage mode of the jack J configured in this way will be described. Between the lower surface of the support object A (shown in FIG. 7 and FIG. 8) and the base B such as the table to be supported and the work to be processed. A plurality of jacks J are interposed in the space portion. At this time, if the second lift screw 7 having the support head 9 of each jack J is protruded upward from the operation head 5 of the first lift screw 3 by an appropriate length, the support by the support head 9 The operation of supporting the object A can be performed efficiently, and the operation head 5 of the first lifting screw 3 is disposed at an intermediate position in the space between the object A and the base B. The lower surface etc. of the can be rotated without being disturbed.

  After disposing the jack J in the space between the support object A and the base B in this manner, the first head screw 3 is operated by rotating the operation head 5 at the upper end of the first screw 3 When the cylindrical main body 1 is screwed in a rising direction, the second elevating screw 7 screwed with the female screw 6 (6 ') of the first elevating screw 3 is also integrally raised. The support head 9 abuts on the lower surface of the support object A. First, the first raising and lowering screw rod 3 is raised to bring its support head 9 into slight contact with the lower surface of the support object A, and then the operation head 5 is turned to operate the support head 9. It may be crimped to the lower surface of the support object A.

In this manner, the operation head 5 is rotated to press the upper surface of the support head 9 against the lower surface of the support object A, and the second lifting screw 7 having the support head 9 is made unrotatable, When the upper end operating head 5 of the first lift screw 3 is rotated to perform leveling adjustment of the object A, the male screw 4 of the first lift screw 3 is rotated against the female screw of the cylindrical main body 1. The second raising and lowering screw rod 7 can not rotate due to the pressing force between the upper surface of its supporting head 9 and the lower surface of the object A while it is raised while being screwed. The first raising and lowering screw rod 3 in which the female screw portion 6, 6 ' is screwed to the male screw portion 8 is screwed on the male screw portion 8 of the second raising and lowering screw rod 7 by the rotation operation of its operation head 5. The male screw 8 of the second lifting screw 7 is relatively in the female screw 6 (6 ') of the first lifting screw 3 It will be retirement.

  At this time, the pitch of the male screw 4 of the first lifting screw 3 screwed to the female screw 2 of the cylindrical main body 1 is screwed to the female screw 6 provided on the first lifting screw 3. Since the pitch of the male screw 7 of the second lifting screw 7 is reduced, the support object A is obtained even if the first lifting screw 3 is raised relative to the cylindrical main body 1 by the rotation operation of the operation head 5. The support head 9 of the second raising and lowering screw rod 7 which supports the second lifting screw 7 is raised only by a distance obtained by subtracting the pitch of the male screw 8 of the second raising and lowering screw rod 7 from the pitch of the male screw 4 of the first raising and lowering screw rod 3 .

  For example, when the pitch of the male screw 8 of the second lifting screw 7 is formed to be 2/3 of the pitch of the male screw 4 of the first lifting screw 3, as shown in FIG. When the first lift screw 3 is raised by three pitches, the second lift screw 7 is lowered by two pitches. Therefore, the support head 9 is raised by one pitch to support the support object A. It will push up. Similarly, when the support head 9 is lowered by rotating the operation head 5 in the reverse direction from the state where the support object 9 is supported by the support head 9, It is possible to lower the pitch of the external thread portion 4 by the distance obtained by subtracting the pitch of the external thread portion 8 of the second lifting screw 7.

  Thus, while raising or lowering the first lift screw 3 by the rotation operation of the operation head 5, the support head 9 supporting the support object A with a distance shorter than the lift distance is lowered or lowered. As it is raised, the rotational operation of the operation head 5 can be performed with a relatively light force, and the fine adjustment of the stroke from the cylindrical main body 1 to the support head 9 and the leveling of the support object A is simple and accurate It can be done well. If the load applied to the support head 9 from the side of the support object A is large and it is difficult to rotate the operation head 5 manually, the circular hole 15a or the support head 9 provided in the operation head 5 is The distal end portion of a handle shaft (not shown) for rotational operation may be inserted into and engaged with a locking hole 19 provided in the upper portion to rotate the operation head 5 and the support head 9.

  After the leveling adjustment of the support object A, as shown in FIG. 9, the pressing piece 12b screwed into the screw hole 11 provided at the upper end of the cylindrical main body 1 is screwed with a hexagon wrench or the operating rod 20. The lock piece 12a is pushed forward with its front end face and crimped to the outer peripheral surface of the first raising and lowering screw rod 3 screwed to the female screw portion 2 of the cylindrical main body 1, thereby locking the first raising and lowering screw rod 3. Similarly, the lock piece 16a is pushed forward by screwing the pressing piece 16b screwed into the screw hole portion 15b provided in the operation head 5 of the first raising and lowering screw rod 3, and the tip face thereof is moved to the first raising and lowering screw. The second lifting screw rod 7 is locked by being crimped to the outer peripheral surface of the second lifting screw rod 7 screwed to the female screw portion 6, 6 'of the rod 3.

J Jack A support object 1 cylindrical main body 2, 6, 6 'female screw 3 first lift screw 4 8, 8 male screw 5 operation head 7 second lift screw 9 support head
11 screw holes
15a Round hole
12, 16 lock pieces

Claims (1)

A tubular main body provided with a female screw on the inner peripheral surface of the upper end opening, and an external thread screwed to the female screw on the cylindrical main body on the outer peripheral surface, and an operation head integrally provided on the upper end In addition, a first cylindrical lifting and lowering screw rod provided with a female screw portion opened upward from the upper surface of the operation head at the central portion, and a female screw portion of the first lifting and lowering screw rod on the outer peripheral surface The pitch of the male thread portion of the first lifting screw rod formed of the second lifting screw rod provided with the mating male screw portion and the supporting head integrally provided at the upper end, and screwed with the female thread portion of the cylindrical main body The pitch of the male screw portion of the second lifting screw screwed to the female screw portion provided on the first lifting screw rod is made smaller than that of the first lifting screw rod, and the upper end portion of the cylindrical main body A screw hole is provided extending between the inner and outer peripheral surfaces, and the screw hole is provided at the back of the screw hole. A lock piece having a diameter smaller than that of the lock piece is loosely fitted, and a press piece screwed back and forth in a screw hole is disposed on the back side of the lock piece, and the lock piece is raised and lowered by screwing the press piece The first raising and lowering screw rod is locked by being crimped to the outer peripheral surface of the screw rod, and the operation head of the first raising and lowering screw rod penetrates across the inner and outer peripheral surfaces of the operation head. And a circular hole having a screw hole formed in the inner peripheral surface, and a lock piece having a diameter smaller than that of the screw hole is loosely fitted to the back of the circular hole and the lock A press piece screwed back and forth in the screw hole is disposed on the back side of the piece, and the press piece is screwed on the lock piece by crimping it against the outer peripheral surface of the second lift screw rod to make a second lift screw rod. Are configured to lock the Jack.

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