JP5046899B2 - Engagement chain for lifting drive - Google Patents

Description

  The present invention is incorporated in an elevating device that moves the elevating table 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 is rotatable with respect to the pair of left and right hook-shaped inner plates 510 and the pair of front and rear bushes 520 press-fitted to the inner plate 510. A pair of front and rear rollers 570 and a pair of front and rear connecting pins 560 that are rotatably inserted into the bushes 520 are press-fitted to both ends of the connecting pins 560 to connect the inner plate 510 in the longitudinal direction of the chain. A pair of hook-shaped outer plates 550 are provided, and the inner plates 510 and the outer plates 550 are engaged with each other in a state where they are shifted by a half pitch in the longitudinal direction of the chain. Yes.
Japanese Patent Laid-Open No. 11-278797 (in particular, see page 1 and FIG. 1)

However, in the conventional meshing chain 500, the inter-bush pitch Wi of the inner plate 510 and the inter-pin pitch Wo of the outer plate 550 are generally set at intervals satisfying the formula Wo = Wi− (Wb−Wp), As shown in FIG. 7, when a load such as the weight of the lifting table or the object to be lifted is applied to the chain during the ascending drive, the connecting pin 560 is located on the inner side in the chain longitudinal direction in each inner plate 510 with respect to the bush 520. The center of the bush 520a that is unevenly distributed and press-fitted to the lower side of the inner plate 510a that precedes the ascending drive and the center of the bush 520b that is press-fitted to the upper side of the inner plate 510b that follows the inner plate 510a Is smaller than the pitch Wi between the bushes of the inner plate 510, that is, the mutual distance X is X = Wo− (W To become a distance that satisfies the formula -Wp), rattling upon engagement of the sprocket S there is a problem that occurs mutual spacing of the bushes 520 over the chain longitudinal direction becomes uneven.
Furthermore, as described above, the distance between the bushes 520 in the longitudinal direction of the chain becomes uneven during the ascending drive, and therefore, the outer plate 550 and the inner plate 510 constituting one of the pair of meshing chains 500 and the other meshing chain 500. There is a problem in that the positional relationship in the longitudinal direction of the chain between the outer plate 550 and the inner plate 510 that constitute the chain, that is, the height relationship varies, and the meshing state between the chains is displaced. .

  Further, in the conventional meshing chain 500 as described above, the roller 570 is loosely fitted to the bushing 520 so that the roller 570 is in relation to the center of the connecting pin 560 or the bushing 520 when meshing with the sprocket S. Is unevenly distributed, and there is a problem that meshing vibration and meshing noise are generated between the roller 570 and the sprocket S. Further, the meshing vibration between the roller 570 and the sprocket S is caused. There is a problem in that a shift occurs in the meshing state between the chains, and as a result, vibration generated due to such a shift in the meshing state may be transmitted to the object to be lifted.

  In the meshing chain 500 as described above, since the roller 570 is formed separately from the bush 520 and a sufficient thickness cannot be secured, the roller 570 and the sprocket are raised when the object to be lifted such as a heavy object is raised. There was a problem that the fatigue failure of the roller 570 was liable to occur due to the high load applied to S.

  Therefore, the present invention solves the conventional problems. That is, the object of the present invention is to achieve a smooth meshing state between the chains and to raise and lower the sprocket without causing rattling or meshing vibrations. It is to provide a meshing chain for raising and lowering drive that smoothly meshes with each other, and further improves the durability of the bush and reliably suppresses the buckling that tends to occur in the chain width direction.

  The invention according to claim 1 is a hook-like shape in which an inner link unit formed by press-fitting a pair of front and rear bushes to hook-like inner tooth plates spaced apart in a pair on the left and right is arranged 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 external tooth plate are connected in the longitudinal direction of the chain, and are arranged opposite to the pair of lifting sprockets that mesh with the bushes, respectively, from the horizontal direction to the vertical direction. The inner tooth plates and the outer tooth plates facing each other while being deflected are meshed with each other while being shifted in the longitudinal direction of the chain and lifted together in a self-standing state, and from the vertical direction to the horizontal direction by the pair of lifting sprockets A lifting drive meshing chain that branches off the inner tooth plate and the outer tooth plate while deflecting each other. In addition, a connection pin is unevenly distributed on the inner side in the longitudinal direction of the chain in each internal tooth plate with respect to the bush by the action of the weight of at least the self-standing portion that precedes when the ascending drive is performed by the lifting sprocket. The center of the bush press-fitted to the upper side of the inner tooth plate following the inner tooth plate and the center of the bush press-fitted to the lower side of the inner tooth plate preceding the inner tooth plate during the ascending drive Is set so as to be equal to the mutual interval between the two and the above-mentioned problems are solved.

  In the invention according to claim 2, in addition to the structure of the lifting / lowering drive meshing chain described in claim 1, the pitch between the pins of the outer tooth plate is equal to the pitch between the bushes of the inner tooth plate. By setting the length to be equal to the length obtained by adding the diameter difference from the outer periphery of the connecting pin, the above-described problem is solved.

  According to a third aspect of the present invention, in addition to the structure of the lifting drive meshing chain described in the first or second aspect, a plate side press-fitting portion in which the bush is press-fitted to an internal tooth plate, and the plate side press-fitting portion The above-mentioned problem is solved by integrally providing a sprocket meshing portion with a large diameter.

  According to a fourth aspect of the present invention, in addition to the structure of the lifting drive meshing chain described in any one of the first to third aspects, a plurality of the inner link units are arranged in the chain width direction. Thus, the above-mentioned problem is solved.

The “inter-bush pitch between the bushes of the inner tooth plate” as referred to in the raising / lowering drive meshing chain of the present invention is an interval at which the centers of the bushes press-fitted to the inner tooth plate in a pair of front and rear are spaced apart from each other in the longitudinal direction of the chain. I mean.
In addition, the “inter-pin pitch of the external tooth plate” as referred to in the lifting drive meshing chain of the present invention means that the centers of the connecting pins press-fitted to the external tooth plate in a pair of front and rear are separated from each other in the longitudinal direction of the chain. This is the interval.

  Accordingly, the present invention provides a hook-shaped external tooth in which an inner link unit formed by press-fitting a pair of front and rear bushes to a pair of hook-shaped inner teeth plates 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 plate are connected in the longitudinal direction of the chain, and are arranged opposite to a pair of elevating sprockets that mesh with the bush, while deflecting from the horizontal direction to the vertical direction. The inner tooth plates and the outer tooth plates facing each other are meshed with each other while being shifted 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 a pair of lifting sprockets. The sprocket for lifting is rotated by biting the tooth plates and the external tooth plates separately. Not only can a constant velocity and quickly achieve the lifting operation of the lift object Te Align can achieve the specific effect as described below.

According to the raising / lowering drive meshing chain of the invention according to claim 1, the connecting pin is connected to the bush in each internal tooth plate by the action of the weight of the self-standing portion at least preceding when the raising / lowering sprocket is driven to rise. The center of the bush that is unevenly distributed inward in the longitudinal direction and the pitch between the bushes of the internal tooth plate is press-fitted to the lower side of the preceding internal tooth plate during ascending drive and the upper side of the internal tooth plate that follows the internal tooth plate By setting it so that it is equal to the mutual distance from the center of the bush that is press-fitted into the chain, the connecting pin is in the length of the chain in each internal tooth plate due to the load of the object to be lifted Even when unevenly distributed on the inner side in the direction, the mutual intervals of the bushes in the longitudinal direction of the chain are equal, so the mutual intervals of the bushes are unequal. To suppress liable to occur backlash between the lifting sprocket engagement can be achieved a smooth meshing engagement with the lifting sprocket.
In addition, as described above, the mutual spacing between the bushes during the ascending drive is made equal to each other, so that the outer tooth plate and the inner tooth plate constituting one of the pair of lifting drive meshing chains and the other lifting drive meshing chain can be provided. Since the positional relationship in the longitudinal direction of the chain between the external tooth plate and the internal tooth plate, that is, the height relationship can be appropriately adjusted with a half pitch shift, a smooth meshing state between the chains can be realized. .

According to the lifting drive meshing chain of the invention according to claim 2, in addition to the effect of the invention according to claim 1, the pitch between the pins of the external tooth plate is equal to the pitch between the bushes of the internal tooth plate. Is set to be equal to the length obtained by adding the diameter difference between the outer periphery of the connecting pin and the outer periphery of the connecting pin. Even when unevenly distributed inward in the longitudinal direction, the pitch between the bushes of the internal tooth plate is different between the center of the bush press-fitted to the lower side of the preceding internal tooth plate during the ascending drive and the internal tooth plate following the internal tooth plate. When the bushes are press-fitted on the upper side, the distance between the bushes is equal to the center of the bushes and the distance between the bushes in the longitudinal direction of the chain is equal. Smooth meshing state of liable to occur lifting sprocket to suppress looseness and with the descending sprocket can be realized.
In addition, as described above, the mutual spacing between the bushes during the ascending drive is made equal to each other, so that the outer tooth plate and the inner tooth plate constituting one of the pair of lifting drive meshing chains and the other lifting drive meshing chain can be provided. Since the positional relationship in the longitudinal direction of the chain between the external tooth plate and the internal tooth plate, that is, the height relationship can be appropriately adjusted with a half pitch shift, a smooth meshing state between the chains can be realized. .

  According to the elevating drive meshing chain of the invention according to claim 3, in addition to the effect produced by the invention according to claim 1 or 2, the plate-side press-fitting part and the plate-side press-fitting part in which the bush is press-fitted into the internal tooth plate By having a larger diameter sprocket meshing part integrally, the lifting drive meshing chain of the present invention is stable with the lifting sprocket on the specified outer peripheral surface of the sprocket meshing part molded integrally with the bush. Because of the contact, the center of the roller is unevenly distributed with respect to the center of the connecting pin or bush when meshing with the sprocket like a conventional meshing chain using rollers, and meshing vibration and meshing noise are generated between the sprocket and the sprocket. In addition, by preventing the occurrence of meshing vibration between the bush and the lifting sprocket in this way, As a result, it is possible to avoid the occurrence of deviation in the meshing state, so that stable lifting operation can be realized without giving vibration to the object to be lifted and lowered due to such meshing state deviation, and the rotational force of the lifting sprocket Can be efficiently transmitted to the raising / lowering engagement chain.

Further, the present invention has a sprocket meshing portion with a diameter larger than that of the plate-side press-fitting portion, so that the present invention is compared with a conventional meshing chain that employs a roller that is molded separately from the bush and cannot secure a sufficient thickness. In the lifting drive meshing chain, the sprocket meshing part is formed integrally with the bushing to ensure a sufficient thickness, so that the sprocket meshing part is not subject to the load applied when lifting the object to be lifted such as heavy objects. Exhibits high load resistance and prevents fatigue failure of the bush.
In the lifting drive meshing chain of the present invention, since no roller is used and the number of parts of the chain can be reduced, it is possible to reduce the burden of disassembling and assembling work such as chain cutting.

  According to the ascending / descending drive meshing chain of the invention according to claim 4, in addition to the effect produced by the invention according to any one of claims 1 to 3, a plurality of inner link units are arranged in the chain width direction. Therefore, the external tooth plate and the internal tooth plate that constitute one of the pair of lifting drive meshing chains are chained with respect to the external tooth plate and the internal tooth plate that constitute the other lifting drive meshing chain. Since the hooks, so-called chucks, are engaged with each other in multiple directions in a double row, the buckling that tends to occur in the chain width direction of the lifting drive engagement chain is reliably suppressed and excellent chain durability is achieved. In addition, the meshing balance with the lifting sprocket in the chain width direction can be improved.

  The present invention relates to a hook-shaped external tooth plate in which an inner link unit formed by press-fitting a pair of front and rear bushes to a pair of left and right hook-shaped internal teeth plates 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 pins are connected in the longitudinal direction of the chain. The opposing internal tooth plates and the external tooth plates are engaged with each other while being shifted 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 a pair of lifting sprockets. Lifting and lowering sprockets in a lifting and lowering engagement chain that diverges and branches each other and the external tooth plates. Due to the weight of the part of the self-standing state that precedes at the time of the ascending drive by the joint, the connecting pin is unevenly distributed in the chain longitudinal direction inside each internal tooth plate with respect to the bush, and the pitch between the bushes of the internal tooth plate increases. The distance between the center of the bush press-fitted on the lower side of the preceding inner tooth plate during driving and the center of the bush press-fitted on the upper side of the inner tooth plate following the inner tooth plate is equal to each other. To achieve a smooth meshing state between the chains and smoothly mesh with the lifting sprocket without causing rattling or meshing vibrations, and improve the durability of the bushing in the chain width direction. As long as the buckling that tends to occur is reliably suppressed, any specific embodiment may be used.

For example, regarding the specific shapes of the internal tooth plate, the external tooth plate, and the intermediate tooth plate used in the lifting drive meshing chain of the present invention, the same type of plates facing each other mesh with each other so that they are vertical from the horizontal direction. Any shape may be used as long as it rises in a self-supporting state while being deflected in the direction, and is disengaged and branched while being deflected 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.

  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. 2 is a perspective view showing a state in which the elevating table and the panta arm are removed from FIG. 3 is a partially enlarged view of the raising / lowering driving engagement chain, FIG. 4 is a partial sectional view of the raising / lowering driving engagement chain, and FIG. FIG. 6 is an explanatory view showing a state in which a load of an object to be lifted is applied to a pair of lifting drive meshing chains arranged opposite to each other.

  First, as shown in FIG. 1, the lifting / lowering interlocking chain 100 according to the first embodiment of the present invention has a lifting table T on which an object to be lifted (not shown) such as a heavy load is mounted 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. G is a pair of power transmission chains comprising a roller chain for transmission. Reference numeral G represents a speed change in one direction from the pair of power transmission chains C and forward and reverse rotation in opposite directions to the pair of elevating sprockets S. A reference numeral A denotes 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. Ascending / descending auxiliary guide means of the upper and lower two-stage connection form consisting of: R is a slide lever on which the lower end of the inner arm A2 slides according to the raising / lowering operation. Is Le, the symbol B is a winding type chain storing box for storing the one of the pair of lift drive engagement chains 100 that branches off bite each other.

The lifting / lowering engagement chain 100 of this embodiment used as a pair in the engagement chain type lifting / lowering device E is a so-called chuck chain, and is separated as a pair of right and left as shown in FIGS. An inner link unit 130 formed by press-fitting a pair of front and rear bushes 120 to the arranged hook-shaped inner tooth plate 110 is arranged in parallel via two hook-shaped intermediate tooth plates 140 in the chain width direction. In addition, a large number of inner link units 130 are connected in the longitudinal direction of the chain by a pair of front and rear connection pins 160 that are press-fitted into a pair of front and rear pin holes of a hook-shaped external tooth plate 150 arranged on the outermost side in the chain width direction. Is.
Further, as shown in FIG. 4, the intermediate tooth plate 140 is assembled by press-fitting, that is, so-called “similar fitting” with respect to the connecting pin 160, so that the weight of the object to be lifted is increased on the lifting drive engagement chain 100. Even when the resulting high load is applied, it is designed to suppress the bending of the connecting pin 160 and prevent the fatigue failure that tends to occur when the connecting pin 160 is bent.
Further, as described above, since the gap between the pin hole of the intermediate tooth plate 140 and the connection pin 160 is eliminated, the bending of the connection pin 160 is suppressed, and each plate disposed on the intermediate tooth plate 140 side, for example, The intermediate tooth plate 140 and the internal tooth plate 110 adjacent to the intermediate tooth plate 140 also bear a high load due to the weight of the object to be lifted, etc., and are designed to significantly improve the load balance in the chain width direction. Has been.

  Further, as shown in FIGS. 3 to 6, the pair of lifting drive mesh chains 100 are arranged so as to face the pair of lifting sprockets S and are opposed to each other while being deflected from the horizontal direction to the vertical direction. The tooth plates 110, the outer tooth plates 150, and the intermediate tooth plates 140 are engaged with each other in a state of being shifted by a half pitch, and are lifted together in a self-supporting state. Thus, the internal tooth plates 110, the external tooth plates 150, and the intermediate tooth plates 140 are respectively disengaged and branched while being deflected from the vertical direction to the horizontal direction.

Therefore, specific forms of the internal tooth plate 110, the external tooth plate 150, and the bush 120, 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, the pin-to-pin pitch Wo of the outer tooth plate 150, the bush-to-bush pitch Wi of the inner tooth plate 110, the inner diameter Wb of the bush 120, and the outer diameter Wp of the connecting pin satisfy Wo = Wi + (Wb−Wp). Each is formed.
Therefore, as shown in FIGS. 5 and 6, the center of the bush 120a press-fitted to the lower side of the preceding internal tooth plate 110a during the upward driving and the upper side of the inner tooth plate 110b following the inner tooth plate 110a. The distance X between the centers of the bushes 120b press-fitted to the bushing 120 is equal to the pitch Wi between the bushes of the internal tooth plate 110. As a result, the distance between the bushes 120 in the longitudinal direction of the chain is ascending when driving up. Each is set to be equal.
The above-described expression “Wo = Wi + (Wb−Wp)” does not mean that “Wo” and “Wi + (Wb−Wp)” are completely equal, but allows a certain error or the like. Needless to say.

As shown in FIG. 4, the bush 120 is integrally provided with a plate-side press-fitting portion 121 that is press-fitted to the internal tooth plate 110, and a sprocket meshing portion 122 that is larger in diameter than the plate-side press-fitting portion 121.
By forming the bush 120 in this manner, the specified outer peripheral surface of the sprocket meshing portion 122 makes stable contact with the elevating sprocket S, so that the sprocket S as in the conventional meshing chain 500 using the roller 570. The center of the roller 570 is unevenly distributed with respect to the center of the connecting pin 560 or the bush 520 at the time of meshing with the sprocket S, thereby preventing meshing vibration and meshing noise from occurring with the sprocket S.
Furthermore, in comparison with the conventional meshing chain 500 that employs a roller 570 that is formed separately from the bushing 520 and cannot secure a sufficient thickness, the sprocket meshing portion 122 of the lifting drive meshing chain 100 of the present invention has the bushing 120. As a result, the sprocket meshing portion 122 exhibits a high load resistance performance against a load applied when lifting an object to be lifted such as a heavy object. ing.

As described above, a plurality of inner link units 130 are arranged in the chain width direction.
Therefore, the external tooth plate 150, the internal tooth plate 110, and the intermediate tooth plate 140 that constitute one of the pair of lifting drive mesh chains 100, and the external tooth plate 150 that constitutes the other lift drive mesh chain 100 that faces the other. And the inner tooth plate 110 and the intermediate tooth plate 140 are engaged in multiple hooks, so-called chucks, in multiple rows in the chain direction, and are generated in the chain width direction of the lifting drive meshing chain 100. Buckling that tends to occur is reliably suppressed, and the meshing balance with the elevating sprocket S in the chain width direction can be improved.

Note that “the pitch Wi between the bushes of the internal tooth plate 110” as referred to in the lifting drive meshing chain 100 of the present invention means that the center of the bush 120 that is press-fitted to the internal tooth plate 110 by a pair of front and rear is the longitudinal direction of the chain. This is the distance between the two.
Further, the “pitch between pins Wo of the external tooth plate 150” as referred to in the lifting chain meshing chain 100 of the present invention means that the center of the connecting pin 160 press-fitted to the external tooth plate 150 in a pair of front and rear is the length of the chain. An interval that is spaced apart in the direction.

In the lift chain meshing chain 100 according to the embodiment of the present invention obtained in this way, the connecting pin 160 is connected to the bush 120 by the action of the weight of the self-standing portion that precedes at least when the lift sprocket S is lifted. On the other hand, the bushes 120a that are unevenly distributed inward in the longitudinal direction of the chain in each internal tooth plate 110 and the bushing pitch Wi of the internal tooth plate 110 is press-fitted and fitted to the lower side of the internal tooth plate 110a that precedes when driving up. It is set to be equal to the mutual distance X between the center and the center of the bush 120b press-fitted on the upper side of the internal tooth plate 110b following the internal tooth plate 110a.
Therefore, even when the connecting pin 160 is unevenly distributed on the inner side in the longitudinal direction of the chain in each internal tooth plate 110 with respect to the bush 120 due to the load of the lifted object or the like, as shown in FIG. Since the mutual spacing between the bushes 120 is equal, the backlash that tends to occur with the lifting sprocket S when the mutual spacing between the bushes 120 is unequal is suppressed, and the smoothing with the lifting sprocket S is suppressed. A meshing state can be realized.

  Further, as described above, by equalizing the mutual spacing of the bushes 120 during the ascending drive, the external tooth plate 150 and the internal tooth plate 110 constituting the one of the pair of lift driving mesh chains 100 and the other lift driving drive. Since the positional relationship in the longitudinal direction of the chain between the external tooth plate 150 and the internal tooth plate 110 constituting the meshing chain 100, that is, the height relationship can be appropriately adjusted in a state shifted by a half pitch, smoothness between the chains can be achieved. Can achieve a proper meshing state.

Further, the bush 120 is integrally provided with a plate-side press-fitting portion 121 that is press-fitted into the internal tooth plate 110 and a sprocket meshing portion 122 having a larger diameter than the plate-side press-fitting portion 121.
Therefore, in the lifting / lowering driving engagement chain 100 of the present invention, since the specified outer peripheral surface of the sprocket engagement portion 122 formed integrally with the bush 120 is in stable contact with the lifting / lowering sprocket S, a conventional roller 570 is used. When meshing with the sprocket S as in the meshing chain 500, the center of the roller 570 is unevenly distributed with respect to the center of the connecting pin 560 or the bush 520, and meshing vibration and meshing noise can be prevented from occurring between the sprocket S, Further, by preventing the occurrence of meshing vibration between the bush 120 and the elevating sprocket S in this way, it is possible to avoid the occurrence of deviation in the meshing state between the chains. Stable lifting operation can be realized without giving vibration to the object to be lifted due to the deviation, It is possible to transmit the rotational force of the descending sprocket S to efficiently lift drive engagement chains 100.

Further, the bush 120 includes a sprocket meshing portion 122 having a diameter larger than that of the plate-side press-fit portion 121.
Therefore, compared to the conventional meshing chain 500 that employs a roller 570 that is formed separately from the bushing 520 and cannot secure a sufficient thickness, the lifting drive meshing chain 100 of the present invention has the sprocket meshing portion 122 and the bushing 120. Since it is molded integrally to secure a sufficient thickness, the sprocket meshing portion 122 exhibits high load resistance against the load applied when raising the object to be lifted such as a heavy object, It is possible to prevent fatigue failure.
In the lifting / lowering engagement chain 100 of the present invention, since no roller is used and the number of parts of the chain can be reduced, it is possible to reduce the burden of disassembling and assembling such as chain cut-off.

A plurality of inner link units 130 are arranged in the chain width direction.
Therefore, the external tooth plate 150 and the internal tooth plate 110 that constitute one of the pair of lifting drive mesh chains 100 and the other external tooth plate 150 and the internal tooth plate 110 that constitute the other lift drive mesh chain 100 facing each other. In contrast, multiple hooks, so-called chucks, are engaged in multiple rows in the chain direction, so that buckling that tends to occur in the chain width direction of the lifting drive engagement chain 100 is reliably suppressed. The effects are enormous, such as excellent chain durability and improved meshing balance with the lifting sprocket S in the chain width direction.

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 partial enlarged view of the meshing chain for a raising / lowering drive. The partial cross section figure of the meshing chain for a raising / lowering drive. Explanatory drawing which shows the state which the load of the to-be-lifted object acted on the raising / lowering drive meshing chain. Explanatory drawing which shows the state which the load of the to-be-lifted object acted on a pair of meshing chain for a raising / lowering drive opposingly arranged. Explanatory drawing which shows the state which the load of the to-be-lifted object acted on the conventional meshing chain.

DESCRIPTION OF SYMBOLS 100 ... Lifting drive meshing chain 110 ... Internal tooth plate 120 ... Bush 121 ... Plate side press-fit part 122 ... Sprocket meshing part 130 ... Inner link unit 140 ... Intermediate tooth plate 150・ ・ ・ External tooth plate 160 ・ ・ ・ Connecting pin Wi ・ ・ ・ Pitch between bushes of internal tooth plate Wo ・ ・ ・ Pitch between pins of external tooth plate Wb ・ ・ ・ Inner diameter of bush Wp ・ ・ ・ Outer diameter of connecting pin E ... Meshing 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 ...・ Transmission gear group A ... Elevation assist guide means A1 ... Inner arm A2 ... Outer arm R ... Slide rail B ... Chain storage box

Claims (4)

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 rear connecting pins that are press-fitted into the holes, and are opposed to the pair of elevating sprockets that mesh with the bushes, and are opposed to each other while deflecting from the horizontal direction to the vertical direction. The tooth plates and the external tooth plates are engaged with each other in a shifted state in the longitudinal direction of the chain and lifted together in a self-supporting state while being deflected from the vertical direction to the horizontal direction by the pair of elevating sprockets, In the chain for elevating and lowering that branches by biting the external tooth plates,
Due to the action of the weight of at least the self-standing portion that precedes the ascending drive by the elevating sprocket, the connecting pin is unevenly distributed in the longitudinal direction inside the chain in each internal tooth plate with respect to the bush, and the bush of the internal tooth plate A pitch between the center of the bush press-fitted to the lower side of the preceding internal tooth plate and the center of the bush press-fitted to the upper side of the inner tooth plate following the inner tooth plate during the ascending drive. An ascending / descending drive meshing chain which is set to be equal to each other.   The pitch between the pins of the external tooth plate is set to be equal to the length of the pitch between the bushes of the internal tooth plate plus the diameter difference between the inner periphery of the bush and the outer periphery of the connecting pin. The meshing chain for raising and lowering drive according to claim 1.   The lifting / lowering according to claim 1 or 2, wherein the bush is integrally provided with a plate-side press-fitting portion that is press-fitted into the inner tooth plate and a sprocket meshing portion having a larger diameter than the plate-side press-fitting portion. Drive chain.   The elevating drive meshing chain according to any one of claims 1 to 3, wherein a plurality of the inner link units are arranged in a chain width direction.

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