JP2010078120A - Meshing chain for driving lifting/lowering operation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a meshing chain for driving lifting/lowering operation improved in load balance and chain durability, capable of reducing the driving noise and size of the chain by adjusting weight balance over the whole of the chain to improve load balance and to stably lift a lifted material to a higher position by improving chain durability, reducing the driving noise, reducing the size of the chain, and bringing both internal tooth plates and both external tooth plates to be brought into contact with each other over the whole surface of a plate cross section. <P>SOLUTION: This meshing chain 100 for driving lifting/lowering operation includes: internal tooth plates 110; bushes 120; external tooth plates 140; and connecting pins 150. At least one of the internal tooth plates 110 and the external tooth plates 140 is punched from a direction opposite to the punching direction of the residual plates, and connected by the connecting pins 150 in a state that the arrangement order of a shear cross section X and a broken cross section Y in the plate punching direction is reversed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is incorporated in an elevating device that moves the elevating table back and forth in parallel with the installation surface for use in manufacturing equipment in various manufacturing fields, transport equipment in the transport field, nursing care equipment in the medical and welfare field, stage equipment in the art field, etc. The present invention relates to an elevating drive meshing chain.

  Conventionally, as a lifting device, there is a pair of meshing chains that mesh with each other and move up and down integrally, that is, a lifting device that lifts and lowers an object to be lifted such as a heavy object using a chuck chain (see, for example, Patent Document 1). ).

  As shown in FIG. 7, the meshing chain 500 has an inner link unit 530 formed by press-fitting a pair of front and rear bushes 520 on a pair of left and right hook-shaped inner plates 510 in the chain width direction. Many pairs are connected in the longitudinal direction of the chain by a pair of front and rear connecting pins 550 that are press-fitted into a pair of front and rear pin holes of the outermost hook-shaped outer plate 540, and are arranged opposite to a pair of sprockets that mesh with the bushing 520, respectively. The inner plates 510 and the outer plates 540 facing each other while being deflected from the horizontal direction to the vertical direction are meshed with each other while being shifted by a half pitch in the longitudinal direction of the chain, and are integrally driven up in a self-supporting state. ing.

In such a meshing chain 500, generally, in order to improve production efficiency, the inner plate 510 and the outer plate 540 are stamped and formed using a common mold, and the inner plate 510 and On the plate cutting surface of the outer plate 540, as shown in FIG. 7, a smooth shear surface X is formed at the rear in the plate punching direction, and the rough fracture surface Y is at the front in the plate punching direction. Is formed.
Japanese Patent No. 3370928 (Claims, FIG. 1)

  However, in the conventional meshing chain 500, as shown in FIG. 7, the hook portions formed on the inner plate 510 and the outer plate 540 extend in the same plate longitudinal direction and in the same plate height direction. In this state, the inner plate 510 and the outer plate 540 are arranged, respectively. As a result, as shown in FIG. 7, the arrangement order of the shear plane X and the fracture surface Y in each plate in the plate thickness direction is all. The plate is arranged in the same order in common, so that the plate thickness direction, that is, the chain width direction is caused by the weight difference generated between the light fracture surface Y side and the heavy shear surface X side. There is a deviation in the weight balance of the entire chain, and the deviation in the weight balance in this way can counter the weight of the object to be lifted when the meshing chain 500 is driven to rise. That in the load balance deteriorated in the chain width direction, it decreases and the driving noise of the chain durability was a problem occurs.

  In particular, when the meshing chain 500 is lengthened in the longitudinal direction of the chain and the lift altitude of the object to be lifted is set high, the meshing chain 500 becomes constant during the ascending drive due to the deterioration of the load balance of the meshing chain 500 as described above. Therefore, there is a problem that the inner plates 510 and the outer plates 540 of the pair of meshing chains 500 may be separated from each other and buckled.

  In the conventional meshing chain 500, as shown in FIG. 8, when the pair of meshing chains 500 are meshed, the inner plate is in a state where only the shearing surfaces X protruding toward the opposing plates are in contact with each other. Since the 510 and the outer plate 540 mesh with each other, the load balance in the chain width direction with respect to the weight of the object to be lifted is deteriorated, and the pair of meshing chains 500 in mesh with each other easily tilt or buckle in the chain width direction. In addition, as described above, since the weight of the object to be lifted and the like is received in a state where only the shearing surface X is in contact, there is a problem that the surface pressure at the shearing surface X is increased and the plate life is likely to be reduced. .

  Therefore, the present invention solves the conventional problem, that is, the object of the present invention is to improve the load balance with respect to the weight of an object to be lifted by adjusting the weight balance of the entire chain in the chain width direction. As a result, the object to be lifted can be stably raised to a higher position, chain durability can be improved, drive noise can be reduced, and the chain size can be reduced. Plates and external teeth plates are brought into contact with each other over the entire surface of the plate, improving the load balance in the chain width direction of the pair of lifting drive meshing chains, improving chain durability, reducing drive noise, An object of the present invention is to provide an ascending / descending drive meshing chain that realizes a reduction in chain size.

  According to the first aspect of the present invention, an inner link unit in which a pair of front and rear bushes are press-fitted and fitted to a pair of left and right hook-like inner teeth plates is disposed on the outermost side in the chain width direction. A plurality of front and rear connecting pins that are press-fitted into a pair of front and rear pin holes of the outer tooth plate of the outer teeth plate are connected in the longitudinal direction of the chain. The inner tooth plates and the outer tooth plates facing each other while being deflected to each other are meshed with each other while being shifted by a half pitch in the longitudinal direction of the chain. Lifting drive meshing divergence that branches off by engaging the internal and external tooth plates while deflecting in the horizontal direction. At least one of the internal tooth plate and the external tooth plate arranged in the chain width direction and connected by the connecting pin is punched from the direction opposite to the plate punching direction of the remaining plate in the plate punching direction. The above-described problem is solved by arranging the shearing surface and the fractured surface in an inverted state.

  According to a second aspect of the present invention, in addition to the structure of the first aspect, half of the internal tooth plate and the external tooth plate that are arranged in the chain width direction and are connected by a connecting pin are formed by punching the remaining plates. The above-described problems are solved by punching from the opposite direction and arranging the sheared surfaces and the fractured surfaces in the plate punching direction in the reverse order.

  According to a third aspect of the present invention, in addition to the configuration according to the first or second aspect, the internal tooth plate and the external tooth plates that are integrally meshed by the lifting sprocket are one internal tooth plate and external tooth. The above-described problems are solved by meshing the shearing surface formed on the plate and the fracture surface formed on the other internal tooth plate and external tooth plate in contact with each other.

  Therefore, in the lifting drive meshing chain according to the present invention, an inner link unit formed by press-fitting a pair of front and rear bushes on a hook-like inner tooth plate spaced apart from each other on the left and right is disposed on the outermost side in the chain width direction. A large number of front and rear connecting pins that are press-fitted into a pair of front and rear pin holes in the hook-shaped external tooth plate are connected in the longitudinal direction of the chain, and are arranged opposite to a pair of lifting sprockets that mesh with the bushing from the horizontal direction. The internal tooth plates and the external tooth plates facing each other while being deflected in the vertical direction are engaged with each other in a state where they are shifted by a half pitch in the longitudinal direction of the chain. The inner tooth plate and the outer tooth plate are disengaged and branched while deflecting from one direction to the horizontal. Accordingly, in accordance with the rotation of the elevating sprocket not only constant velocity and quickly achieve the lifting operation of the lifting thereof, can be achieved peculiar effects as follows.

  According to the raising / lowering drive meshing chain of the present invention according to claim 1, at least one of the internal tooth plate and the external tooth plate arranged in the chain width direction and connected by the connecting pin is the plate punching direction of the remaining plates. The inner tooth plate and the outer tooth plate are placed rearward in the plate punching direction by punching from the opposite direction and arranging the shearing surface and the fracture surface in the plate punching direction in reverse order. Even if there is a deviation in weight in the plate punching direction due to the weight difference between the formed shear surface side and the fracture surface side formed in front of the plate punching direction, the chain width In order to adjust the weight balance of the entire chain over the direction, the inclination of the lifting drive meshing chain in the chain width direction can be suppressed to the weight of the object to be lifted Load balance that can be improved.

  In addition, by improving the load balance in the chain width direction in this way, the object to be lifted can be stably raised to a higher position without causing tilting or buckling of the lifting drive meshing chain in the chain width direction. As well as being able to ascend, it is possible to improve the durability of the chain by avoiding partial overload acting on the lifting drive meshing chain, and to reduce drive noise that tends to occur during chain operation. As described above, the chain size can be reduced by improving the buckling strength of the raising / lowering driving engagement chain.

  According to the lifting drive meshing chain of the present invention according to claim 2, in addition to the effect produced by the lifting drive meshing chain according to claim 1, the internal tooth plate arranged in the chain width direction and connected by the connecting pin And half of the external tooth plates are punched from the direction opposite to the plate punching direction of the remaining plates and arranged in a state in which the arrangement order of the shearing surface and the fracture surface in the plate punching direction is reversed. Since the weight balance of the entire chain in the width direction is uniformly maintained, the load balance with respect to the weight of the lifted object can be further improved.

  According to the lifting drive meshing chain of the present invention according to claim 3, in addition to the effect produced by the lifting drive meshing chain according to claim 1 or claim 2, The external tooth plates mesh with each other in a state in which the shearing surface formed on one internal tooth plate and the external tooth plate and the fracture surface formed on the other internal tooth plate and the external tooth plate are in contact with each other. Unlike conventional meshing chains that engage the inner plates and outer plates with only the shearing surfaces protruding toward the opposite plate sides contacting each other, the inner tooth plates and the outer tooth plates A pair of lifting drive engagement chains in a state of being engaged with each other because they are in contact with each other over the entire plate cutting surface. It can be improved load balancing on the weight, etc. of the lifting thereof.

  In addition, as described above, the inner tooth plates and the outer tooth plates are in contact with each other over the entire surface of the plate cutting surface, so that the surface pressure applied to the plate cutting surfaces of the outer tooth plate and the inner tooth plate is reduced. Plate life.

  In addition, as described above, by improving the load balance of the pair of lifting drive meshing chains engaged with each other, the pair of lifting drive meshing chains does not tilt or buckle in the chain width direction. The lifted object can be stably raised to a higher position, and the chain durability can be improved by avoiding partial overload acting on each lifting drive meshing chain. Drive noise that tends to occur can be reduced, and further, the chain size can be reduced by improving the buckling strength of the lifting drive meshing chain as described above.

  The raising / lowering drive meshing chain of the present invention is a hook in which an inner link unit formed by press-fitting a pair of front and rear bushes on a hook-shaped inner tooth plate spaced apart in a pair on the left and right is disposed on the outermost side in the chain width direction. A large number of front and rear connecting pins that are press-fitted into a pair of front and rear pin holes in a cylindrical outer tooth plate are connected in the longitudinal direction of the chain. The inner tooth plates and the outer tooth plates facing each other while being deflected to each other are meshed with each other while being shifted by a half pitch in the longitudinal direction of the chain and lifted together in a self-supporting state and horizontally from a vertical direction by a pair of lifting sprockets The inner tooth plates and outer tooth plates are disengaged and branched while deflecting in the direction of the chain. At least one of the internal tooth plate and external tooth plate to be arranged is punched in the direction opposite to the plate punching direction of the remaining plate and connected in a state where the arrangement order of the shear surface and the fracture surface in the plate punching direction is reversed. It is connected by a pin to improve the load balance with respect to the weight of the object to be lifted by adjusting the weight balance of the entire chain in the chain width direction, stably raising the object to be lifted to a higher position, Achieves improved chain durability, reduced drive noise, and reduced chain size. In addition, the internal and external tooth plates that are integrated by the lifting sprocket are in contact with each other over the entire plate cutting surface. To improve the load balance in the chain width direction of the pair of lifting drive meshing chains, Sex improve, reduce the driving noise, as long as to reduce the size of the chain size, form of the specific implementation may any be any one.

  For example, regarding the specific shapes of the internal tooth plate and the external tooth plate used in the raising / lowering drive meshing chain of the present invention, the same type of plates facing each other are meshed with each other while being deflected from the horizontal direction to the vertical direction. Any shape may be used as long as it rises in a self-supporting state and deviates from each other while branching from the vertical direction to the horizontal direction.

  Further, the number of rows of the inner link units arranged in parallel in the chain width direction in the lifting drive meshing chain of the present invention may be either a single row or a double row such as two rows or three rows. When a plurality of units are arranged in the chain width direction, the external tooth plate and the internal tooth plate that constitute one of the pair of lifting drive meshing chains constitute the other lifting drive meshing chain that faces the other. Buckling that tends to occur in the chain width direction of the lifting / lowering engagement chain because the outer tooth plate and the inner tooth plate are engaged in multiple hooks, so-called chucks, in multiple rows in the chain direction. Can be reliably suppressed, and excellent chain durability can be achieved, and the meshing balance with the lifting sprocket in the chain width direction can be improved.

  In addition, the bush used in the lifting drive meshing chain of the present invention integrally forms a normal-shaped bush, a plate-side press-fitting portion that is press-fitted into an internal tooth plate, and a sprocket meshing portion having a larger diameter than the plate-side press-fitting portion. The bush that is obtained by this method may be used, and when a bush consisting of a plate-side press-fit portion and a sprocket meshing portion is used, it will stably contact the lifting sprocket at the specified outer peripheral surface of the sprocket meshing portion. Contact vibration and contact noise that tend to occur between the lifting sprocket and the center axis of the roller is unevenly distributed with respect to the center axis of the connecting pin or bush when engaging with the lifting sprocket as in the case of using a roller In addition, compared with the case of using a roller, the sprocket meshing part is formed integrally with the bush. Since the wall thickness can be secured, it can exhibit a high load bearing ability against loads exerted when increasing the target elevation of such heavy.

  In addition, the pitch between the bushes of the internal tooth plate is press-fitted to the center of the bush press-fitted to the lower side of the preceding internal tooth plate and the upper side of the internal tooth plate following the internal tooth plate during the ascending drive by the lifting sprocket. The pitch between the pins of the outer tooth plate is set to be equal to the distance between the centers of the combined bushes, i.e., the difference between the inner periphery of the bush and the outer periphery of the connecting pin It may be set to be equal to the added length, and when the pitch between pins and the pitch between bushes are set in this way, the connecting pin is in relation to the bush due to the load of the lifted object etc. Even when unevenly distributed in the longitudinal direction of the chain in each internal tooth plate, the mutual spacing of the bushes in the longitudinal direction of the chain is equal, so the mutual spacing of the bushes is not uniform. In this case, it is possible to suppress the looseness that tends to occur with the lifting sprocket and to achieve a smooth meshing state with the lifting sprocket. Thus, the position in the longitudinal direction of the chain between the external tooth plate and the internal tooth plate constituting one of the pair of lifting drive meshing chains and the external tooth plate and the internal tooth plate constituting the other lifting drive meshing chain. Since the relationship, that is, the height relationship can be appropriately adjusted in a state shifted by a half pitch, smooth meshing timing between the chains can be realized.

  And, the meshing chain type lifting device incorporating the lifting drive meshing chain according to the present invention can move up and down regardless of whether the installation surface is a floor surface in a stationary installation form or a ceiling surface in a suspended installation form. There is no hindrance, and there is no hindrance to the advancing / retreating operation corresponding to the above-described lifting / lowering operation even with a vertical wall surface in a cantilevered support form.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a lifting drive meshing chain 100 according to an embodiment of the present invention will be described with reference to the drawings.
Here, FIG. 1 is a view showing a usage mode using an elevating drive meshing chain according to an embodiment of the present invention, and FIG. FIG. 3 is a partially enlarged view showing a lifting drive meshing chain, FIG. 4 is a schematic view showing one of a pair of lifting drive meshing chains, and FIG. 5 is a pair of lifting drive meshing chains. FIG. 6 is an explanatory view showing a meshing state between a pair of lifting drive meshing chains.

  First, as shown in FIG. 1, an elevating drive meshing chain 100 according to an embodiment of the present invention has an elevating table T for mounting an elevating object (not shown) such as a heavy object parallel to the installation surface. In order to move up and down, it is used by being incorporated in a mesh chain type lifting device E installed in a stationary state on the work floor.

  As shown in FIGS. 1 and 2, the above-described meshing chain type lifting device E is mounted in parallel with the base plate P installed on the installation surface on which the lifting table T described above is lifted in parallel. A pair of elevating sprockets S that are opposed to each other in the same plane around the pair of rotating shafts and rotate in the opposite direction in the opposite direction, and the elevating table T is raised and lowered by being disengaged from the pair of elevating sprockets S Basically, a pair of lifting drive mesh chains 100, the lifting table T which is fixed to the upper end of the lifting drive mesh chains 100 and moves up and down, and a drive motor M which drives a pair of lifting sprockets S are basically provided. Equipped as a simple device configuration.

  1 and FIG. 2 are a pair of drive-side sprockets arranged coaxially on the output shaft side of the drive motor M, and the reference C is a power from the drive-side sprocket D to the pair of lift sprockets S side. A pair of power transmission chains composed of a roller chain for transmission, and a symbol G for transmitting power from the pair of power transmission chains C to the pair of lifting sprockets S so as to rotate forward and backward in opposite directions. Reference numeral A is a synchronous gear group, and symbol A is an upper and lower two-stage connection form comprising an inner arm A1 and an outer arm A2 called an X-shaped panter arm installed between the lifting table T and the base plate P on the installation surface side. The reference symbol R is a slide rail in which the lower end of the outer arm A2 slides in accordance with the lifting operation, and the reference symbol B is mutually engaged. It is in a winding type chain storing box for storing the one of the pair of lift drive engagement chain 100 which is branched.

The lifting / lowering engagement chain 100 of this embodiment used as a pair in the engagement chain type lifting device E is a so-called chuck chain, and is separated as a pair of right and left as shown in FIGS. A pair of front and rear pins of a hook-shaped external tooth plate 140 in which an inner link unit 130 formed by press-fitting a pair of front and rear bushes 120 to the disposed hook-shaped internal tooth plate 110 is disposed on the outermost side in the chain width direction. A large number of connecting pins 150 are press-fitted into the holes and connected in the longitudinal direction of the chain by a pair of connecting pins 150.
A roller 160 is fitted on the bush 120 described above.

  Further, as shown in FIGS. 3 to 5, the pair of raising / lowering driving mesh chains 100 are disposed opposite to the pair of raising / lowering sprockets S and are opposed to each other while being deflected from the horizontal direction to the vertical direction. The tooth plates 110 and the external tooth plates 140 are meshed with each other while being shifted by a half pitch so as to rise together in a self-supporting state, and from the vertical direction to the horizontal direction by the pair of lifting sprockets S described above. The inner tooth plates 110 and the outer tooth plates 140 are disengaged and branched while being deflected toward each other.

Therefore, specific forms of the internal tooth plate 110 and the external tooth plate 140, which are the most characteristic features of the lifting drive meshing chain 100 of this embodiment, will be described in detail with reference to FIGS.
First, in the lifting drive meshing chain 100 of the present embodiment, half of the inner tooth plate 110 and the outer tooth plate 140 are punched from the direction opposite to the plate punching direction of the remaining half plate, and the shear plane X in the plate punching direction X Are connected by a connecting pin 150 in a state in which the order of arrangement with the fracture surface Y is reversed.

That is, as shown in FIG. 4, the lifting / lowering driving mesh chain 100a, which is one of the pair of lifting / lowering driving mesh chains 100, has a pair of external tooth plates 140a in a state where the shearing surface X is positioned on the outer side in the chain width direction. A pair of internal teeth plates 110a are disposed in a state where the shear plane X is positioned on the inner side in the chain width direction.
Further, as shown in FIG. 5, the other lifting / lowering driving engagement chain 100b facing the lifting / lowering driving engagement chain 100a has a pair of external tooth plates 140b in a state where the shear surface X is positioned on the inner side in the chain width direction. And a pair of internal tooth plates 110b with the shear plane X positioned on the outer side in the chain width direction.

  By designing the lifting / lowering driving engagement chains 100a and 100b in this way, the weight deviation in the plate punching direction due to the weight difference generated between the shearing surface X side and the fractured surface Y side is determined by the internal teeth. Even when the plate 110 and the external tooth plate 140 are generated, the weight balance of the entire chain in the chain width direction is uniformly maintained.

  Further, when the above-described one raising / lowering driving meshing chain 100a and the other raising / lowering driving meshing chain 100b are meshed with each other, as shown in FIG. The shear plane X formed on the tooth plate 110a and the external tooth plate 140a contacts the fracture surface Y formed on the internal tooth plate 110b and the external tooth plate 140b constituting the other lifting drive meshing chain 100b. At the same time, the fracture surface Y formed on the internal tooth plate 110a and the external tooth plate 140a constituting one lifting drive engagement chain 100a is the internal tooth plate 110b and the external tooth plate constituting the other lift driving engagement chain 100b. Opposing and contacting the shearing surface X formed in 140b.

  Thus, unlike the conventional meshing chain 500 in which the inner plates 510 and the outer plates 540 are meshed with each other in a state where only the shearing surfaces X projecting toward the opposing plates are in contact with each other, the inner tooth plate 110 and external tooth plates 140 are in contact with each other over the entire plate cutting surface.

  In addition, regarding the plate cutting surfaces of the internal tooth plate 110 and the external tooth plate 140 in FIGS. 4 to 6, the inclination caused by the shear surface X and the fracture surface Y is greatly exaggerated.

In the lifting drive meshing chain 100 of this embodiment obtained in this way, half of the internal tooth plate 110 and the external tooth plate 140 that are arranged in the chain width direction and are connected by the connecting pins 150 are the rest of the plates. Punching is performed from the direction opposite to the plate punching direction, and the arrangement is made in a state where the arrangement order of the shear plane X and the fracture surface Y in the plate punching direction is reversed.
Therefore, the internal tooth plate 110 and the external tooth plate 140 have a piece of weight in the plate punching direction due to a weight difference generated between the shear plane X side and the fractured surface Y side formed in front of the plate punching direction. Even when each shift occurs, the weight balance of the entire chain in the chain width direction is uniformly maintained, so that the load balance with respect to the weight of the object to be lifted can be further improved.

  In addition, by improving the load balance in the chain width direction in this way, the object to be lifted can be stabilized at a higher position without causing tilting or buckling of the lifting drive engagement chain 100 in the chain width direction. The chain durability can be improved by avoiding partial overload acting on the lifting drive meshing chain 100, and the drive noise that tends to occur during chain operation can be reduced. As described above, the chain size can be reduced by improving the buckling strength of the lifting drive meshing chain 100.

Further, the internal tooth plates 110 and the external tooth plates 140 that are integrally meshed by the lifting sprocket S are connected to the shear surface X formed on the one internal tooth plate 110 and the external tooth plate 140 and the other internal tooth plate 110 and the external tooth plate 140. The fracture surface Y formed on the tooth plate 140 is engaged with each other while being in contact with each other.
Therefore, unlike the conventional meshing chain 500 that meshes the inner plates 510 and the outer plates 540 with only the shearing surfaces X projecting toward the opposing plate sides in contact with each other, the inner tooth plate 110. Since the plates and the external tooth plates 140 are brought into contact with each other over the entire surface of the plate cutting surface, the load balance with respect to the weight of the object to be lifted and the like of the pair of lifting drive meshing chains 100 engaged with each other is improved. it can.

  Further, as described above, since the internal tooth plates 110 and the external tooth plates 140 are in contact with each other over the entire surface of the plate cutting surface, the surfaces of the external tooth plate 140 and the plate cutting surfaces of the internal tooth plate 110 are affected. The plate life can be improved by reducing the pressure.

  Further, as described above, by improving the load balance of the pair of lifting drive meshing chains 100 in mesh with each other, the pair of lifting drive meshing chains 100 is tilted or buckled in the chain width direction. The object to be lifted can be stably raised to a higher position without any partial overload acting on each lifting drive engagement chain 100, and the chain durability can be improved. Drive noise that tends to occur when the chain is operating can be reduced, and as described above, the buckling strength of the lifting drive engagement chain 100 can be improved, and the size of the chain can be reduced. It is.

The use aspect figure using the meshing chain for raising / lowering drive which is one Example of this invention. The perspective view of the state which removed the raising / lowering table and the panta arm from FIG. The partially expanded view which shows the meshing chain for raising / lowering drive. The schematic diagram which shows one side of a pair of meshing chain for a raising / lowering drive. The schematic diagram which shows the other of a pair of raising / lowering drive meshing chain. Explanatory drawing which shows the meshing state between a pair of raising / lowering drive meshing chains. The schematic diagram which shows the conventional meshing chain. Explanatory drawing which shows the state in which the conventional meshing chain meshed in a pair.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Chain for raising / lowering drive 110 ... Internal tooth plate 120 ... Bush 130 ... Inner link unit 140 ... Outer tooth plate 150 ... Connection pin 160 ... Roller E ... Engagement chain type lifting device S ... Elevating sprocket T ... Elevating table P ... Base plate M ... Drive motor D ... Drive side sprocket C ... Power transmission chain G ... Synchronous gear group A ... Elevating assist guide means A1 ... Inner arm A2 ... Outer arm R ... Slide rail B ... Chain storage box X ... Shear surface Y ... Broken surface

Claims (3)

A pair of front and rear pins of a hook-shaped outer tooth plate in which an inner link unit is formed by press-fitting a pair of front and rear bushes to a pair of left and right hook-shaped inner tooth plates. A large number of connecting pins in the longitudinal direction of the chain are connected by a pair of front and back connecting pins that are press-fitted into the holes. The tooth plates and the outer tooth plates are engaged with each other in a state where they are shifted by a half pitch in the longitudinal direction of the chain and lifted in a self-supporting state while being deflected from the vertical direction to the horizontal direction by the pair of lifting sprockets. In the chain for elevating and lowering that branches by biting each other and the external tooth plates,
At least one of the internal tooth plate and the external tooth plate arranged in the chain width direction and connected by the connecting pin is punched from the direction opposite to the plate punching direction of the remaining plate, and the shear surface in the plate punching direction is broken. An ascending / descending drive meshing chain characterized by being arranged in a state in which the arrangement order with respect to the cross section is reversed.   Half of the internal tooth plate and the external tooth plate arranged in the chain width direction and connected by the connecting pins are punched from the direction opposite to the plate punching direction of the remaining plates, and the shear surface and the fracture surface in the plate punching direction The raising / lowering drive meshing chain according to claim 1, wherein the arrangement order is reversed.   The internal tooth plates and the external tooth plates that are integrally meshed by the elevating sprocket are shear surfaces formed on one internal tooth plate and external tooth plate, and a fracture surface formed on the other internal tooth plate and external tooth plate The meshing chain for raising and lowering drive according to claim 1, wherein the meshing chains are engaged with each other in a state where they are in contact with each other.

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