Abstract:
Provided is an interlocking chain-type forward and backward actuating device, the device being configured so that an increase in the number of parts is minimized, an increase in the size of the device is avoided, the amount of scattering of lubricating oil to the outside of the device is reduced, the wear of connection pins is reduced, the breakage of the connection pins is avoided, and the striking noise and vibration of the chains occurring during the reception of the chains are reduced. Chain guide plates are respectively provided on both sides of a pair of interlocking chains in the chain width direction. Chain locus restriction members having chain locus restriction faces in contact with rigid chain portions, which are made rigid by engaging and integrating the pair of interlocking chains with each other, are disposed so as to be adjacent to the rigid chain portions.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a national stage application under 35 U.S.C. 371 and claims the benefit of PCT Application No. PCT/JP2011/078755 having an international filing date of 13 Dec. 2011, which designated the United States, and which PCT application claimed the benefit of Japanese Patent Application No. 2011-004245 filed on Jan. 12, 2011, the disclosure of which is incorporated herein by reference. 
     FIELD OF THE INVENTION 
     The present invention relates to an interlocking chain type forward and backward actuating device, which moves a driven body forward and backward and is used in manufacturing facilities in various manufacturing fields, a transportation facility in a transportation field, a nursing care facility in a medical and welfare field, a stage facility in an art field, and the like. 
     BACKGROUND OF THE INVENTION 
     Conventionally, as an interlocking chain type forward and backward actuating device, an interlocking chain type lift device has been known that moves a driven body such as a heavy load using a pair of interlocking chains (also referred to as zip chains) that are interlocked with each other and are integrally driven (for example, see Patent Document 1). 
     Further, as an interlocking chain, an interlocking chain has been known that guides a plate coupling pin projected outside of a plate constituting the interlocking chain in a running groove (for example, see Patent Document 2). 
     PRIOR ART DOCUMENTS 
     Patent Documents 
     Patent Document 1: Japanese Laid-Open Patent Publication No. 2009-255997 (refer to Claims and FIG. 1) 
     Patent Document 2: Japanese Laid-Open Patent Publication No. 2010-138926 (refer to paragraph [0029] and FIG. 2) 
     SUMMARY OF THE INVENTION 
     However, with the above-described conventional interlocking chain type lift device, if an interlocking chain, in which a plurality of chain units are coupled in a chain width direction, is used to increase a transportation capacity of a driven body, a plurality of guide plates that guides each chain unit is required. Therefore, it is a problem that the number of components constituting the device increases. 
     With the interlocking chain type lift device using the above-described conventional interlocking chain, the locus of the plate coupling pin becomes complicated in front and rear of a chain interlocking portion, where a pair of interlocking chains is interlocked. Accordingly, this makes it difficult to avoid an increase in work when forming a chain guide, in which the chain guide is formed in a complicated guide shape according to the locus of the plate coupling pin. 
     Additionally, with the interlocking chain type lift device using the above-described conventional interlocking chain, lubricating oil of the chain scatters from the plate coupling pin exposed outside of the plate to the outside of the interlocking chain. There are measures where a cover for preventing the lubricating oil from scattering is provided such that the lubricating oil may not scatter around the interlocking chain. However, even if the cover for preventing the lubricating oil from scattering reduces contamination around the chain, this increases the number of components and the size of the device. Further, the structure of the device renders it difficult to reduce the amount of scatter of the lubricating oil the outside of the device. 
     Further, with the interlocking chain type lift device using the above-described interlocking chain, in the case where the interlocking chain is driven by engaging a drive sprocket to a rigid chain part where a pair of interlocking chains is interlocked, abrasion force between the plate coupling pin and the entire running groove increases due to an increase in a reaction against a pressing force that the plate coupling pin is pressed to the running groove. This raises a problem where reducing the abrasion of the plate coupling pin is difficult. 
     Further, with the interlocking chain type lift device using the above-described interlocking chain, when a pair of interlocking chains that is interlocked to maintain a rigid state is extended from a chain guide to the outside of the device and the rigid chain part is housed from an inlet of the chain guide again, a wobbling occurs at the rigid chain part according to drive of the chain. There is a problem when the plate coupling pin intermittently collides with an edge of the inlet of the chain guide, generating a chain collision noise and a vibration and damaging the plate coupling pin. 
     Accordingly, a technical problem that the present invention aims to solve, namely, an object of the present invention is to provide an interlocking chain type forward and backward actuating device that avoids increases in the number of components, the size of the device, and work in forming the chain guide, avoids the amount of scatter of the lubricating oil to the outside of the device, reduces a chain collision noise and a vibration that occur when the interlocking chain extended in a rigid state is housed again into the chain guide, and achieves reduction in abrasion and avoidance of damage of the coupling pin that couples the plates to each other. 
     Means for Solving the Problems 
     To solve the above described problems, the invention according to claim  1  provides an interlocking chain type forward and backward actuating device including a pair of interlocking chains, a driven body, and a chain guide plate. The interlocking chains includes hook-shaped inner tooth plates and hook-shaped outer tooth plates. The hook-shaped outer tooth plates are arranged alternately with the inner tooth plates in a chain longitudinal direction. A large number of the inner tooth plates and the outer tooth plates are coupled to one another in the chain longitudinal direction with coupling pins. The coupling pins extend through the inner tooth plates and the outer tooth plates in a chain width direction. The pair of interlocking chains is driven by a drive sprocket such that the interlocking chains become rigid with the inner tooth plates interlocked and the outer tooth plates interlocked, and such that the interlocking chains bifurcate from each other with the interlocked inner tooth plates being disengaged and the interlocked outer tooth plates being disengaged. The driven body is mounted to the pair of interlocking chains. The driven body is moved forward and backward according to forward and backward movement of the pair of interlocking chains. A chain guide plate and a chain locus regulating means. The chain guide plate includes a disengagement part guide. The disengagement part guide guides a projecting portion of the coupling pin at a chain disengagement part where the interlocking chains are disengaged from each other in the chain width direction. The chain guide plate is arranged respectively at both sides of the pair of interlocking chains in the chain width direction. The chain locus regulating means guides a rigid chain part. The chain locus regulating means includes a chain locus regulating face. The chain locus regulating face contacts the rigid chain part where the interlocking chains are interlocked with each other to become rigid. The chain locus regulating means is slidably arranged at the rigid chain part. 
     To solve the above described problems, the invention according to claim  2  provides the interlocking chain type forward and backward actuating device according to claim  1  in which the chain locus regulating means includes a pair of chain locus regulating members. The chain locus regulating members bring the respective chain locus regulating faces into contact with outer plate faces from both sides of the rigid chain parts in the chain width direction. The outer plate faces are included in a pair of respective outer tooth plates arranged outermost among the plurality of outer tooth plates included in the rigid chain parts in the chain width direction. The rigid chain part includes a coupling pin, the coupling pin extending through a coupling pin passage in a rigid chain direction. The coupling pin passage is formed at the chain guide plate with the coupling pin passage communicating with the guide for the chain disengagement part. The coupling pin passage has a passage width larger than a guide width of the disengagement part guide. 
     To solve the above described problems, the invention according to claim  3  provides the interlocking chain type forward and backward actuating device according to claim  2  in which the coupling pin passage forms a groove shape open to the rigid chain part in the chain width direction without extending through the chain guide plate. 
     To solve the above described problems, the invention according to claim  4  provides the interlocking chain type forward and backward actuating device according to claim  2  or  3  having a spacer located between the pair of chain guide plates. The spacer defines a distance between the pair of chain guide plates. The guide plates are located at both sides of the pair of interlocking chains in the chain width direction. 
     To solve the above described problems, the invention according to claim  5  provides the interlocking chain type forward and backward actuating device according to claim  1  in which the chain locus regulating means includes a chain locus regulating member. The chain locus regulating member brings the chain locus regulating face into contact with plate side faces of the inner tooth plate and the outer tooth plate included in the rigid chain parts from one side in the chain disengagement direction. The drive sprocket is located on the opposite side from the chain locus regulating member as viewed from the rigid chain parts and engages with one of the interlocking chains. 
     To solve the above described problems, the invention according to claim  6  provides the interlocking chain type forward and backward actuating device according to claim  5  in which a chain width direction regulating face faces the rigid chain part from the chain width direction. The chain width direction regulating face contacts a distal end of a coupling pin included in the rigid chain part. The chain width direction regulating face forms a part of a chain guide plate face of the chain guide plate. 
     To solve the above described problems, the invention provides the interlocking chain type forward and backward actuating device according to any one of claim  1  to claim  6  in which the disengagement part guide is a groove-shaped guide open to the chain disengagement part. The disengagement part guide forms the groove-shaped guide. The disengagement part guide includes a grooved bottom face. The grooved bottom face faces a distal end of the coupling pin included in the chain disengagement part. 
     The interlocking chain type forward and backward actuating device according to claim  1  of the present invention includes a pair of interlocking chains, a driven body, and a chain plate. The interlocking chains include hook-shaped inner tooth plates and hook-shaped outer tooth plates. The hook-shaped outer tooth plates are arranged alternately with the inner tooth plates in a chain longitudinal direction. A large number of the inner tooth plates and the outer tooth plates are coupled to one another in the chain longitudinal direction with coupling pins. The coupling pins extend through the inner tooth plates and the outer tooth plates in a chain width direction. The pair of interlocking chains is driven by a drive sprocket such that the interlocking chains become rigid with the inner tooth plates interlocked and the outer tooth plates interlocked, and such that the pair of interlocking chains bifurcate from each other with the interlocked inner tooth plates being disengaged and the interlocked outer tooth plates being disengaged. The driven body is mounted to the pair of interlocking chains. The driven body is moved forward and backward according to forward and backward movement of the pair of interlocking chains. This allows the driven body to be driven according to the forward and backward movement of the pair of interlocking chains and also provides exceptional advantages corresponding to the following specific configuration. 
     That is, the interlocking chain type forward and backward actuating device according to claim  1  of the present invention includes a chain guide plate and a chain locus regulating means. The chain guide plate includes a disengagement part guide. The disengagement part guide guides a projecting portion of the coupling pin at a chain disengagement part where the interlocking chains are disengaged from each other in the chain width direction. The chain guide plate is arranged respectively at both sides of the pair of interlocking chains in the chain width direction. The chain locus regulating means guides a rigid chain part. The chain locus regulating means includes a chain locus regulating face. The chain locus regulating face contacts the rigid chain part where the interlocking chains are interlocked with each other to become rigid. The chain locus regulating means is slidably arranged at the rigid chain part. Abrasion between the coupling pins included in the rigid chain parts and the inner wall face of the chain guide is avoided while at least the rigid chain parts are guided by the chain locus regulating face. Also, a collision between the coupling pin and the edge of the inlet of the chain guide is avoided when the rigid chain parts, which are extended from the inlet of the chain guide to the outside of the device, are housed into the inlet of the chain guide again. Further, while the rigid chain parts are guided, the periphery of the rigid chain part is at least partially covered by the chain locus regulating face. Accordingly, an increase in work for forming a chain guide where a complicated guide shape of the chain guide is formed is avoided while reduction in abrasion and avoidance of damage of the coupling pin are achieved. Moreover, a chain collision noise and a vibration are reduced, installation of an additional component such as a cover for preventing lubricating oil from scattering is eliminated, increases in the number of components and the size of the device are avoided, and the amount of scatter of the lubricating oil, which scatters to outside of the device, is reduced. 
     The interlocking chain type forward and backward actuating device according to claim  2  of the present invention has the following advantages in addition to the advantages provided by the interlocking chain type forward and backward actuating device according to claim  1 . The chain locus regulating means includes a pair of chain locus regulating members. The chain locus regulating members bring the respective chain locus regulating faces into contact with outer plate faces from both sides of the rigid chain parts in the chain width direction. The outer plate faces is included in a pair of respective outer tooth plates arranged outermost among the plurality of outer tooth plates included in the rigid chain parts in the chain width direction. The rigid chain part includes a coupling pin. The coupling pin extends through a coupling pin passage in a rigid chain direction. The coupling pin passage is formed at the chain guide plate with the coupling pin passage communicating with the guide for the chain disengagement part. The coupling pin passage has a passage width larger than a guide width of the disengagement part guide. Accordingly, a closely contacting state between the coupling pins included in the rigid chain parts and the passage walls of the coupling pin passages can be avoided. Additionally, the rigid chain parts are guided from both sides of the rigid chain parts in the chain width direction to avoid wobbling of the rigid chain parts in a chain width direction when the chains drive. Moreover, the chain disengagement parts and the rigid chain parts are separately guided with the disengagement part guides and the chain locus regulating faces, respectively while the rigid chain parts are covered from both sides of the rigid chain parts with the pair of chain locus regulating faces. Accordingly, abrasion of the coupling pin is further reduced by avoiding abrasion between the coupling pins included in the rigid chain parts and the chain guides. This further reliably achieves avoidance of dual regulations that guide both the coupling pin and the outer plate face simultaneously and reduction in abrasion of the coupling pin based on smooth chain locus regulation. Furthermore, collision of the edge of the inlet of the chain guide with the coupling pin is avoided, reliably achieving avoidance of damage of the coupling pin. Installation of an additional component such as a cover for preventing lubricating oil from scattering is eliminated, and therefore increases in the number of components and the size of the device are further avoided. The amount of scatter of the lubricating oil to the outside of the device is effectively reduced. 
     The interlocking chain type forward and backward actuating device according to claim  3  of the present invention has the following advantages in addition to the advantages provided by the interlocking chain type forward and backward actuating device according to claim  2 . The coupling pin passage forms a groove shape open to the rigid chain part in the chain width direction without extending through the chain guide plate. Since the coupling pin passage covers the coupling pin included in the rigid chain part, the amount of scatter of the lubricating oil to the outside of the device can be further reduced. 
     The interlocking chain type forward and backward actuating device according to claim  4  of the present invention has the following advantages in addition to the advantages provided by the interlocking chain type forward and backward actuating device according to claim  2  or claim  3 . A spacer is located between the pair of chain guide plates. The spacer defines a distance between the pair of chain guide plates. The pair of chain guide plates is located at both sides of the pair of interlocking chains in the chain width direction. Adjusting the distance between the chain guide plates adjusts a chain regulating force. The chain regulating force is applied from a pair of respective chain locus regulating faces to the rigid chain parts in the chain width direction. This appropriately adjusts the chain regulating force according to size change of the interlocking chains in the chain width direction, achieving further reliably reduced abrasion of the coupling pin. 
     The interlocking chain type forward and backward actuating device according to claim  5  of the present invention has the following advantages in addition to the advantages provided by the interlocking chain type forward and backward actuating device according to claim  1 . The chain locus regulating means includes a chain locus regulating member. The chain locus regulating member brings the chain locus regulating face into contact with plate side faces of the inner tooth plate and the outer tooth plate included in the rigid chain parts from one side in the chain disengagement direction. The drive sprocket is located on an opposite side from the chain locus regulating member as viewed from the rigid chain parts and engages with one of the pair of interlocking chains. This avoids contact between the coupling pins included in the rigid chain parts and the inner wall face of the chain guide. Also, when the chains drive, wobbling of the rigid chain parts in the chain disengagement direction is avoided. Moreover, the chain disengagement parts and the rigid chain parts are separately guided with the guide for the chain disengagement part and the chain locus regulating face, respectively while the rigid chain part is covered by the chain locus regulating face. This further reliably achieves reduction in abrasion of the coupling pin and also avoids dual regulations that guide both the coupling pin and the outer tooth plate simultaneously, so as to reduce abrasion of the coupling pin based on smooth chain locus regulation. Furthermore, a collision of the edge of the inlet of the chain guide with the coupling pin is avoided, reliably achieving avoidance of damage of the coupling pin. Installation of an additional component such as a cover for preventing lubricating oil from scattering is eliminated, and therefore increases in the number of components and the size of the device are further avoided. The amount of scatter of the lubricating oil to the outside of the device is effectively reduced. 
     The interlocking chain type forward and backward actuating device according to claim  6  of the present invention has the following advantages in addition to the advantages provided by the interlocking chain type forward and backward actuating device according to claim  5 . A chain width direction regulating face faces the rigid chain part from the chain width direction. The chain width direction regulating face contacts a distal end of a coupling pin included in the rigid chain part. The chain width direction regulating face forms a part of a chain guide plate face of the chain guide plate. Accordingly, when the chain drives, wobbling of the rigid chain parts is avoided both in the chain disengagement direction and the chain width direction, and also covers the coupling pin from the chain width direction. Therefore, when the rigid chain parts extended from the inlet of the chain guide to the outside of the device are housed from the inlet of the chain guide again, the edge of the inlet of the chain guide does not collide with the coupling pin. This further reliably avoids damage of the coupling pin and further reduces the amount of scatter of the lubricating oil outside of the device. 
     The interlocking chain type forward and backward actuating device of the present invention has the following advantages in addition to the advantages provided by the interlocking chain type forward and backward actuating device according to any of claims  1  to  6 . The disengagement part guide is a groove-shaped guide open to the chain disengagement part. The disengagement part guide forms the groove-shaped guide. The disengagement part guide includes a grooved bottom face. The grooved bottom face faces a distal end of the coupling pin included in the chain disengagement part. Accordingly, the coupling pin included in the chain disengagement part is covered by the disengagement part guide from the chain width direction. This reliably avoids scatter of the lubricating oil from the interlocking chain to the outside of the device after the interlocking chains are disengaged from each other. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of an interlocking chain type forward and backward actuating device according to a first embodiment of the present invention; 
         FIG. 2  is an assembly perspective view showing exploded and assembled states of the interlocking chain; 
         FIG. 3  is a front view of the interlocking chain type forward and backward actuating device according to the first embodiment of the present invention; 
         FIG. 4  is an enlarged front view near a chain disengagement position O; 
         FIG. 5  is a cross-sectional view taken along line V-V of  FIG. 3 ; 
         FIG. 6  is a cross-sectional view taken along line VI-VI of  FIG. 3 ; 
         FIG. 7  is a cross-sectional view taken along line VII-VII of  FIG. 3 ; 
         FIG. 8  is a partial cross-sectional view corresponding to  FIG. 5 , illustrating an interlocking chain type forward and backward actuating device according to a second embodiment of the present invention; 
         FIG. 9  is a partial cross-sectional view corresponding to  FIG. 6 , illustrating the interlocking chain type forward and backward actuating device according to the second embodiment of the present invention; 
         FIG. 10  is a partial cross-sectional view corresponding to  FIG. 7 , illustrating the interlocking chain type forward and backward actuating device according to the second embodiment of the present invention; 
         FIG. 11  is a perspective view of an interlocking chain type forward and backward actuating device according to a third embodiment of the present invention; 
         FIG. 12  is an assembly perspective view where exploded and assembled states of an interlocking chain used for the interlocking chain type forward and backward actuating device according to the third embodiment of the present invention are illustrated; 
         FIG. 13  is an enlarged front view near a chain disengagement position in the interlocking chain type forward and backward actuating device according to the third embodiment of the present invention; 
         FIG. 14  is a partial plan view of the interlocking chain type forward and backward actuating device according to the third embodiment of the present invention; and 
         FIG. 15  is a cross-sectional view of a disengagement part guide in the interlocking chain type forward and backward actuating device according to the third embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     An interlocking chain type forward and backward actuating device according to the present invention includes hook-shaped inner tooth plates, hook-shaped outer tooth plates, coupling pins, a pair of interlocking chains, a driven body, a chain guide plate, and a chain locus regulating means. Any specific aspect of the embodiments is possible insofar as the following is met. The hook-shaped outer tooth plates are arranged alternately with the hook-shaped inner tooth plates in the chain longitudinal direction. The coupling pin extends through the inner tooth plates and the outer tooth plates in the chain width direction. A large number of the inner tooth plates and the outer tooth plates are coupled to one another in the chain longitudinal direction with the coupling pins. The pair of interlocking chains is driven by a drive sprocket such that the interlocking chains become rigid with the inner tooth plates interlocked and the outer tooth plates interlocked, and such that the pair of interlocking chains bifurcate from each other with the interlocked inner tooth plates being disengaged and the interlocked outer tooth plates being disengaged. The driven body is mounted to the pair of interlocking chains and is moved forward and backward according to the forward and backward movement of the pair of interlocking chains. The chain guide plates include a disengagement part guide. The disengagement part guide guides a projecting portion of the coupling pin at the chain disengagement part where the pair of interlocking chains is respectively disengaged from the chain width direction. The chain guide plates are located at both sides of the pair of interlocking chains in the chain width direction. The chain locus regulating means guides the rigid chain part. The chain locus regulating means includes a chain locus regulating face. The chain locus regulating face contacts the rigid chain part where the interlocking chains are interlocked with each other to become rigid. The chain locus regulating means is slidably located at the rigid chain part. 
     For example, regarding the specific shapes of plates such as inner tooth plates and outer tooth plates, any shape may be used as long as plates of the same type facing one another integrally engage with each other and are disengaged from each other to bifurcate. 
     The interlocking chain may be constituted by a plurality of rows of chain units in which a large number of link units are respectively coupled in the chain longitudinal direction. The link unit includes inner tooth plates and outer tooth plates located outside of the inner tooth plates. An inner tooth plate and an outer tooth plate constitute one set of the link unit facing in the chain width direction. The interlocking chain may also be constituted by a chain unit of a single row. 
     The chain locus regulating means may be a chain locus regulating member formed integrally with or separately from the chain guide plate. 
     The guide for the chain disengagement part may have a shape that extends through the chain guide plate and may be a groove-shaped guide that does not extend through the chain guide plate. 
     The groove-shaped disengagement part guide is preferred because the amount of scatter of the lubricating oil to the outside of the device after the interlocking chains are disengaged from each other can be reliably reduced. 
     In the case where the disengagement part guides formed in a shape that extends through the chain guide plate, the thickness of the chain guide plate can be reduced by the amount that corresponds to the structure with no groove-shaped guide as the disengagement part guide. This is preferred in that the entire device reduces weight. 
     Additionally, a gap may be provided between a peripheral face of the projecting portion of the coupling pin or a distal end of the coupling pin and the disengagement part guide to reduce contact resistance between the coupling pin and the disengagement part guide. A gap may be provided between the coupling pin included in the rigid chain part and an inner wall face of a coupling pin passage, through which the coupling pin extends, to reduce contact resistance between the coupling pin and the coupling pin passage and to prioritize guidance of the rigid chain part with the chain locus regulating face. 
     With the coupling pin passage with a groove shape and the disengagement part guide to be a groove-shaped guide, a gap, namely, a clearance may be provided between the distal end and a grooved bottom face of the coupling pin to the extent that the coupling pin can be guided. 
     The driven body may be directly mounted to the pair of interlocking chains and may be indirectly mounted to the pair of interlocking chains via a coupling plate. 
     The interlocking chain type forward and backward actuating device according to the present invention does not cause any problem in forward and backward operations even if an installation face is a floor face where the interlocking chain type forward and backward actuating device stands or a ceiling face where the interlocking chain type forward and backward actuating device is suspended. Further, even if the installation face is a vertical wall face where the interlocking chain type forward and backward actuating device is cantilevered, the above-described forward and backward operations do not cause any problem. 
     Embodiments 
     The following describes interlocking chain type forward and backward actuating devices  100 ,  200 , and  300  according to embodiments of the present invention with reference to  FIGS. 1 to 15 . 
       FIG. 1  is a perspective view of an interlocking chain type forward and backward actuating device according to a first embodiment of the present invention.  FIG. 2  is an assembly perspective view showing exploded and assembled states of an interlocking chain.  FIG. 3  is a front view of the interlocking chain type forward and backward actuating device according to the first embodiment of the present invention.  FIG. 4  is an enlarged front view near the chain disengagement position O.  FIG. 5  is a cross-sectional view taken along line V-V of  FIG. 3 .  FIG. 6  is a cross-sectional view taken along line VI-VI of  FIG. 3 .  FIG. 7  is a cross-sectional view taken along the VII-VII of  FIG. 3 .  FIG. 8  is a partial cross-sectional view corresponding to  FIG. 5 , illustrating an interlocking chain type forward and backward actuating device according to a second embodiment of the present invention.  FIG. 9  is a partial cross-sectional view corresponding  FIG. 6 , illustrating the interlocking chain type forward and backward actuating device according to the second embodiment of the present invention.  FIG. 10  is a partial cross-sectional view corresponding to  FIG. 7 , illustrating the interlocking chain type forward and backward actuating device according to the second embodiment of the present invention.  FIG. 11  is a perspective view of an interlocking chain type forward and backward actuating device according to a third embodiment of the present invention.  FIG. 12  is an assembly perspective view where exploded and assembled states of an interlocking chain used for the interlocking chain type forward and backward actuating device according to the third embodiment of the present invention are illustrated.  FIG. 13  is an enlarged front view near a chain disengagement position in the interlocking chain type forward and backward actuating device according to the third embodiment of the present invention.  FIG. 14  is a partial plan view of the interlocking chain type forward and backward actuating device according to the third embodiment of the present invention.  FIG. 15  is a cross-sectional view of a disengagement part guide in the interlocking chain type forward and backward actuating device according to the third embodiment of the present invention. 
     First Embodiment 
     First, the interlocking chain type forward and backward actuating device  100  according to the first embodiment will be described with reference to  FIGS. 1 to 7 . 
     As shown in  FIGS. 1 and 2 , the interlocking chain type forward and backward actuating device  100  according to the first embodiment includes a pair of interlocking chains  110  and  110 , and a driven body  120  as a basic device configuration. Each interlocking chain  110  includes hook-shaped inner tooth plates  111 , hook-shaped outer tooth plates  112 , coupling pins  113 . Each hook-shaped outer tooth plate  112  is shifted in the chain longitudinal direction relative to the corresponding inner tooth plate  111 . The coupling pins  113  extend through inner tooth plates  111  and outer tooth plates  112  in a chain width direction W. A large number of the inner tooth plates  111  and the outer tooth plates  112  are coupled to one another in the chain longitudinal direction with the coupling pins  113 . The pair of interlocking chains  110  and  110  is driven by a drive sprocket SP 1 . The interlocking chains  110  and  110  are interlocked with each other to become rigid at the inner tooth plates  111  and the outer tooth plates  112 . Also, the pair of interlocking chains  110  and  110  disengages from each other at the inner tooth plates  111 , which are respectively engaged, and the outer tooth plates  112 , which are respectively engaged, in chain disengagement direction A to bifurcate them from one another. The driven body  120  is mounted to the pair of interlocking chains  110  and  110 , and is moved forward and backward according to the forward and backward operations of the pair of interlocking chains  110  and  110 . The interlocking chain type forward and backward actuating device  100  is installed on an installation face G. The driven body  120 , such as a table, where a conveyed matter such as a heavy load (not shown) is mounted moves up and down parallel to the installation face G. 
     Next, a specific configuration most characteristic to the interlocking chain type forward and backward actuating device  100  according to the first embodiment will be described in detail with reference to  FIGS. 1 to 7 . 
     The interlocking chain type forward and backward actuating device  100  according to the first embodiment, as shown in  FIGS. 1 to 7 , includes the respective chain guide plates  130  at both sides of the pair of interlocking chains  110  and  110  in the chain width direction W. The chain guide plate  130  includes a chain guide  131  with a disengagement part guide  131 A that guides chain disengagement parts  110 A and  110 A. The chain guide  131  houses the projecting portions of coupling pins  113 A included in the chain disengagement parts  110 A and  110 A, where the pair of interlocking chains  110  and  110  disengages in the chain width direction W. Chain locus regulating member  140  guides the rigid chain parts  110 B and  110 B. The chain locus regulating members  140  include a chain locus regulating face S 1 . The chain locus regulating faces S 1  contact the rigid chain parts  110 B and  110 B, where the interlocking chains  110  and  110  are interlocked with each other to become rigid. By slidably arranging the chain locus regulating members  140  at the rigid chain parts  110 B and  110 B as a chain locus regulating means, abrasion between coupling pins  113 B included in the rigid chain part  110 B and the inner wall face of the chain guide  131  is avoided while at least the rigid chain parts  110 B and  110 B are guided with the chain locus regulating faces S 1  and S 1 . Also, a collision between the coupling pins  113 B and an edge  132 A of an inlet  132  of the chain guide  131  is avoided when the rigid chain parts  110 B and  110 B, which are extended from the inlet  132  of the chain guide  131  to the outside of the device, are housed in the inlet  132  of the chain guide  131  again. Further, while the rigid chain parts  110 B and  110 B are guided, the peripheries of the rigid chain parts  110 B and  110 B are at least partially covered by the chain locus regulating faces S 1  and S 1 . Accordingly, the interlocking chain type forward and backward actuating device  100  avoids an increase in work for forming a chain guide where a complicated guide shape of the chain guide is formed while reduction in abrasion and avoidance of damage of the coupling pin  113  are achieved. Moreover, a chain collision noise and a vibration are reduced, installation of an additional component such as a cover for preventing lubricating oil from scattering is eliminated, increases in the number of components and the size of the device are avoided, and the amount of scatter of the lubricating oil, which scatters to outside of the device, is reduced. 
     In detail, as shown in  FIGS. 3 to 7 , the pair of chain locus regulating members  140  and  140  brings the respective chain locus regulating faces S 1  and S 1  into contact with outer plate faces  1125  and  1125  from both sides of the rigid chain parts  110 B and  110 B in the chain width direction W. The outer plate faces  1125  and  1125  are included in the pair of respective outer tooth plates  112  arranged at the outermost positions among the plurality of outer tooth plates  112  included in the rigid chain parts  110 B and  110 B in the chain width direction W. Coupling pin passages  131 B and  131 B, where the coupling pins  113 B included in the rigid chain parts  110 B and  110 B extend through in a rigid chain direction B, are formed at the chain guide plates  130  with the coupling pin passages  131 B and  131 B communicating with the disengagement part guides  131 A. Since a passage width WB of the coupling pin passage  131 B is larger than a guide width WA of the disengagement part guide  131 A, a closely contacting state is avoided between the coupling pins  113 B included in the rigid chain parts  110 B and  110 B and the passage walls of the coupling pin passages  131 B. Additionally, guiding the rigid chain parts  110 B and  110 B from both sides of the rigid chain parts  110 B and  110 B in the chain width direction W avoids wobbling of the rigid chain parts  110 B and  110 B in the chain width direction W when the chain drives. Moreover, the chain disengagement parts  110 A and  110 A and the rigid chain parts  110 B and  110 B are separately guided with the disengagement part guides  131 A and  131 A and the chain locus regulating faces S 1  and S 1 , respectively while the loci of the rigid chain parts  110 B and  110 B are regulated from both sides of the rigid chain parts  110 B and  110 B with the pair of chain locus regulating faces S 1  and S 1 . Accordingly, the interlocking chain type forward and backward actuating device  100  further achieves reduction in abrasion of the coupling pin  113  by avoiding abrasion between the coupling pins  113 B included in the rigid chain parts  110 B and  110 B and the chain guides  131 . This further achieves avoidance of dual regulations for guiding both the coupling pin  113 B and the outer plate face  112 S simultaneously and reduction in abrasion of the coupling pin  113  based on smooth chain locus regulation. Furthermore, a collision of the edge  132 A of the inlet  132  of the chain guide  131  with the coupling pin  113 B is avoided, reliably achieving avoidance of damage of the coupling pin  113 . Installation of an additional component such as a cover for preventing lubricating oil from scattering is eliminated. Therefore increases in the number of components and the size of the device are further avoided. The amount of scatter of the lubricating oil to the outside of the device is effectively reduced. 
     As shown in  FIG. 7 , coupling pin passages  131 B form a groove shape open to rigid chain parts  110 B and  110 B in the chain width direction W without extending through the chain guide plate  130 . Accordingly, the coupling pin passages  131 B cover the coupling pins  113 B included in the rigid chain parts  110 B and  110 B from the chain width direction W. The interlocking chain type forward and backward actuating device  100  further reduces the amount of scatter of the lubricating oil to the outside of the device. 
     As shown in  FIGS. 1, 3, and 5 to 7 , the pair of chain guide plates  130  and  130  is arranged at both sides of the pair of interlocking chains  110  and  110  in the chain width direction W. A spacer  150  is located between the pair of chain guide plates  130  and  130 . The spacer  150  defines a distance D between the pair of chain guide plates  130  and  130 . Adjusting the distance D between the chain guide plates  130  and  130  adjusts a chain regulating force. The chain regulating force is applied from the pair of respective chain locus regulating faces S 1  and S 1  to the rigid chain parts  110 B and  110 B in the chain width direction W. The interlocking chain type forward and backward actuating device  100  appropriately adjusts the chain regulating force according to size change of the interlocking chains  110  and  110  in the chain width direction W, thus achieving further reliably reduced abrasion of the coupling pins  113 . 
     Further, as shown in  FIGS. 5 and 6 , the disengagement part guide  131 A is a groove-shaped guide open to the chain disengagement parts  110 A. The disengagement part guide  131 A, which constitutes the groove-shaped guides, includes a grooved bottom faces  131 S facing the distal ends of the coupling pins  113 A included in the chain disengagement parts  110 A. Accordingly, the coupling pins  113 A, which are included in the chain disengagement parts  110 A, are covered by the disengagement part guides  131 A in the chain width direction W. The interlocking chain type forward and backward actuating device  100  reliably reduces the amount of scatter of the lubricating oil from the interlocking chains  110  to the outside of the device after the interlocking chains  110  and  110  are disengaged from each other. 
     With the interlocking chain type forward and backward actuating device  100  thus obtained according to the first embodiment, the pair of chain locus regulating members  140  and  140  brings the respective chain locus regulating faces S 1  and S 1  into contact with outer plate faces  112 S and  112 S from both sides of the rigid chain parts  110 B and  110 B in the chain width direction W. The outer plate faces  112 S and  112 S are included in the pair of respective outer tooth plates  112  arranged at the outermost positions among the plurality of outer tooth plates  112  included in the rigid chain parts  110 B and  110 B in the chain width direction W. The coupling pin passages  131 B and  131 B where the coupling pins  113 B included in the rigid chain parts  110 B and  110 B extend through in the rigid chain direction B are formed at the chain guide plates  130  with the coupling pin passages  131 B and  131 B communicating with the disengagement part guides  131 A. Since the passage width WB of the coupling pin passage  131 B is larger than the guide width WA of the disengagement part guide  131 A, reduction in abrasion of the coupling pin  113  is further achieved by avoiding abrasion between the coupling pins  113 B included in the rigid chain parts  110 B and  110 B and the chain guides  131 . This also reliably achieves avoidance of dual regulations that guide both the coupling pin  113 B and the outer plate face  112 S simultaneously and reduction in abrasion of the coupling pin  113  based on smooth chain locus regulation. Furthermore, collisions of the coupling pin  113 B with the inlet  132  of the chain guide  131  in the chain width direction W and with the edge  132 A in the disengagement direction A are avoided, thus reliably achieving avoidance of damage to the coupling pin  113 . Installation of an additional component such as a cover for preventing lubricating oil from scattering is eliminated, and therefore increases in the number of components and the size of the device are further avoided. The amount of scatter of the lubricating oil to the outside of the device is effectively reduced. Thus, the advantages are extensive. 
     Second Embodiment 
     Next, an interlocking chain type forward and backward actuating device  200  according to a second embodiment of the present invention will be described with reference to  FIGS. 8 to 10 . 
     The interlocking chain type forward and backward actuating device  200  according to this embodiment differs only in shapes of a disengagement part guide  231 A and a coupling pin passage  231 B from the corresponding parts of the interlocking chain type forward and backward actuating device  100  according to the above-described first embodiment. Other configurations are the same as those of the interlocking chain type forward and backward actuating device  100  according to the above-described first embodiment. Reference numerals between one hundred and two hundred of parts common to those in the interlocking chain type forward and backward actuating device  100  according to the first embodiment are replaced by numbers in the two hundreds, and the parts will not be further elaborated here. 
     With the interlocking chain type forward and backward actuating device  200  according to the embodiment, the disengagement part guide  231 A and the coupling pin passage  231 B are formed to be shaped so as to extend through a chain guide plate  230 . Accordingly, the chain guide plate  230  may be thinned compared with the case where the disengagement part guide  231 A and the coupling pin passage  231 B are formed into a groove shape, ensuring light weight of the entire device. 
     Forming at least one of the disengagement part guide  231 A and the coupling pin passage  231 B into a shape so as to extend through the chain guide plate  230  allows the interlocking chain type forward and backward actuating device  200  to be light weight in the entire device compared with the case where both the disengagement part guide  231 A and the coupling pin passage  231 B are formed into a groove shape. 
     Third Embodiment 
     Next, an interlocking chain type forward and backward actuating device  300  according to a third embodiment of the present invention will be described with reference to  FIGS. 11 to 15 . 
     The interlocking chain type forward and backward actuating device  300  according to the third embodiment includes a pair of interlocking chains  310  and  310  and a driven body  320  as a basic device configuration. Each interlocking chain  310  includes hook-shaped inner tooth plate  311 , hook-shaped outer tooth plates  312 , and coupling pins  313 . The hook-shaped outer tooth plates  312  are shifted in the chain longitudinal direction relative to the inner tooth plates  311 . The coupling pins  313  extend through the inner tooth plates  311  and the outer tooth plates  312  in the chain width direction W. A large number of the inner tooth plates  311  and the outer tooth plates  312  are coupled to one another in the chain longitudinal direction with the coupling pin  313 . The pair of interlocking chains  310  and  310  is driven by a drive sprocket SP 3 . The interlocking chains  310  and  310  are interlocked with each other at the inner tooth plates  311  and the outer tooth plates  312  to become rigid. Also, the pair of interlocking chains  310  and  310  disengages from each other at the inner tooth plates  311 , which are respectively engaged, and the outer tooth plates  312 , which are respectively engaged, in the chain disengagement direction A to bifurcate from one another. The driven body  320  is mounted to the pair of interlocking chains  310  and  310  and is moved forward and backward according to the forward and backward operations of the pair of interlocking chains  310  and  310 . The interlocking chain type forward and backward actuating device  300  is installed on the installation face G. The driven body  320 , such as a table, on which a conveyed matter such as a heavy load (not shown) is mounted, moves up and down parallel to the installation face G. 
     More specifically, the interlocking chain type forward and backward actuating device  300  according to the third embodiment includes bushings  314 . The coupling pins  313  are inserted into the bushings  314 . The bushings  314  engage the sprocket teeth of the drive sprocket SP 3  to drive the pair of interlocking chains  310  and  310  and moves forward and backward the driven body  320  in the vertical direction in the drawing. 
     Next, a specific configuration most characteristic to the interlocking chain type forward and backward actuating device  300  according to the third embodiment will be described in detail with reference to  FIGS. 11 to 15 . 
     With the interlocking chain type forward and backward actuating device  300  according to the present embodiment, reference numerals between one hundred and two hundred of parts common to those in the interlocking chain type forward and backward actuating device  100  according to the first embodiment are replaced by numbers in the three hundreds, and the parts will not be further elaborated. 
     The interlocking chain type forward and backward actuating device  300  according to the third embodiment, as shown in  FIGS. 11 to 14 , includes respective chain guide plates  330  at both sides of the pair of interlocking chains  310  and  310  in the chain width direction W. The chain guide plate  330  includes a chain guide  331  with disengagement part guides  331 A and  331 A, which guide chain disengagement parts  310 A and  310 A. The chain guide  331  houses the distal end of a coupling pin  313 A included in the chain disengagement parts  310 A and  310 A where the interlocking chains  310  and  310  are disengaged in the chain width direction W. A chain locus regulating member  340 A as a chain locus regulating means is located adjacent to rigid chain parts  310 B and  310 B. The chain locus regulating member  340 A includes a chain locus regulating face S 3  and guides the rigid chain parts  310 B and  310 B. The chain locus regulating face S 3  contacts the rigid chain parts  310 B and  310 B where the interlocking chains  310  and  310  are interlocked with each other to become rigid. 
     Thus, the interlocking chain type forward and backward actuating device  300  according to the third embodiment avoids abrasion between coupling pins  313 B included in the rigid chain parts  310 B and  310 B and the inner wall face of the chain guide  331  while at least the rigid chain parts  310 B and  310 B are guided with the chain locus regulating face S 3 . Also, collision between the coupling pins  313 B and an edge  332 A of an inlet  332  of the chain guide  331  is avoided when the rigid chain parts  310 B and  310 B, which are extended from the inlet  332  of the chain guide  331  to the outside of the device, are housed in the inlet  332  of the chain guide  331  again. Further, while the rigid chain parts  310 B and  310 B are guided, the periphery of the rigid chain part  310 B is at least partially covered by the chain locus regulating face S 3 . Accordingly, the interlocking chain type forward and backward actuating device  300  avoids an increase in work for forming a chain guide where a complicated guide shape of the chain guide is formed, while achieving reduction in abrasion and damages to the coupling pins  313 . Moreover, chain collision noise and vibration are reduced, installation of an additional component such as a cover for preventing lubricating oil from scattering is eliminated, increases in the number of components and the size of the device are avoided, and the amount of scatter of the lubricating oil that scatters outside of the device is reduced. 
     Describing in detail, with the interlocking chain type forward and backward actuating device  300  according to the third embodiment, the chain locus regulating member  340 A, which is a chain locus regulating means, brings the chain locus regulating face S 3  into contact with the respective plate side faces of inner tooth plates  311 B and outer tooth plates  312 B, which are included in the rigid chain parts  310 B and  310 B, from one side in the chain disengagement direction A. The drive sprocket SP 3  is arranged at the side opposite to a chain locus regulating member  340  viewed from the rigid chain parts  310 B and  310 B and engages with one of the pair of interlocking chains  310  and  310 . This avoids galling between the coupling pins  313 B included in the rigid chain parts  310 B and  310 B, namely, the peripheral faces of the coupling pins  313 B and the chain guides  331 , namely, the inner wall faces of the guide for rigid chain part  331 B, which guides the rigid chain part  310 B in a rigid chain direction B. Also, when the chain drives, wobbling of the rigid chain parts  310 B and  310 B in the chain disengagement direction A is avoided. Moreover, the chain disengagement parts  310 A and  310 A and the rigid chain parts  310 B and  310 B are separately guided with the disengagement part guide  331 A and the chain locus regulating face S 3 , respectively while the rigid chain part  310 B is covered by the chain locus regulating face S 3 . This further achieves reduction in abrasion of the coupling pins  313  and also avoids dual regulations for guiding both the coupling pins  313  and the outer tooth plates  312  simultaneously and reduction in abrasion of the coupling pins  313  based on smooth chain locus regulation. Furthermore, a collision of the edge  332 A of the inlet  332  of the chain guide  331  with the coupling pins  313 B is avoided, reliably achieving avoidance of damage of the coupling pin  313 . Installation of an additional component such as a cover for preventing lubricating oil from scattering is eliminated, and therefore increases in the number of components and the size of the device are further avoided. The amount of scatter of the lubricating oil to the outside of the device is effectively reduced, and this further increases strength of the guide. 
     At the side where the drive sprocket SP 3  is located, the chain guide near the inlet  332  of the chain guide  331  is performed by a chain locus regulating member  340 B. 
     Additionally, as shown in  FIGS. 11 to 14 , the interlocking chain type forward and backward actuating device  300  according to this embodiment includes a chain width direction regulating face S 4 . The chain width direction regulating face S 4  faces the rigid chain parts  310 B and  310 B in the chain width direction W and contacts the distal ends of the coupling pins  313 B included in the rigid chain parts  310 B and  310 B. Since the chain width direction regulating face S 4  is a part of a chain guide plate face  333  of the chain guide plate  330 , when the chain drives, wobbling of the rigid chain parts  310 B and  310 B is avoided both in the chain disengagement direction A and the chain width direction W, and the coupling pins  313 B are covered in the chain width direction W. Therefore, when the rigid chain parts  310 B and  310 B extending from the inlet  332  of the chain guide  331  to the outside of the device are housed from the inlet  332  of the chain guide  331  again, the edge  332 A of the inlet  332  of the chain guide  331  does not collide with the coupling pins  313 B, further reliably avoiding damage of the coupling pins  313  and further reducing the amount of scatter of the lubricating oil to the outside of the device. 
     The interlocking chain type forward and backward actuating device  300  according to the third embodiment is similar to the interlocking chain type forward and backward actuating device  100  according to the above-described first embodiment as follows. As shown in  FIG. 15 , a disengagement part guide  331 A is a groove-shaped guide open to the chain disengagement part  310 A. The disengagement part guide  331 A, which constitutes this groove-shaped guide, includes a grooved bottom face  331 S facing the distal end of the coupling pin  313 A included in the chain disengagement part  310 A. Accordingly, the coupling pin  313 A, which is included in the chain disengagement part  310 A, is covered by the disengagement part guide  331 A from the chain width direction W. Thus, the amount of scatter of the lubricating oil from the interlocking chain  310  outside of the device is reliably reduced after the interlocking chains  310  and  310  are disengaged from each other. 
     With the interlocking chain type forward and backward actuating device  300  according to the embodiment, similarly to the interlocking chain type forward and backward actuating device  200  according to the second embodiment, the disengagement part guide  331 A without the grooved bottom face  331 S may be formed and the coupling pin  313 A may extend through the chain guide plate  330  so as to reduce weight of the entire device. 
     With the interlocking chain type forward and backward actuating device  300  thus obtained according to the third embodiment, the chain locus regulating member  340 A, which is a chain locus regulating means, brings the chain locus regulating face S 3  into contact with the respective plate side faces of the inner tooth plates  311 B and the outer tooth plates  312 B, which are included in the rigid chain parts  310 B and  310 B, from one side in the chain disengagement direction A. The drive sprocket SP 3  is located at the side opposite to the chain locus regulating member  340  viewed from the rigid chain parts  310 B and  310 B and engages with one of the interlocking chains  310  and  310 . This further reliably reduces abrasion of the coupling pins  313  and also avoids dual regulations for guiding the coupling pins  313  and the outer tooth plates  312  simultaneously. Abrasion of the coupling pins  313  is reduced based on smooth chain locus regulation. Furthermore, a collision of the edge  332 A of the inlet  332  of the chain guide  331  with the coupling pin  313 B is avoided, reliably achieving avoidance of damage of the coupling pin  313 . Installation of an additional component such as a cover for preventing lubricating oil from scattering is eliminated, and therefore increases in the number of components and the size of the device are further avoided. The amount of scatter of the lubricating oil outside of the device is effectively reduced. Thus, the advantages are extensive. 
     The interlocking chain type forward and backward actuating devices  100 ,  200 , and  300  according to the above-described first embodiment to the third embodiment can be used as a drive unit and secured to a wall face or similar member. 
     DESCRIPTION OF THE REFERENCE NUMERALS 
     
         
           100 ,  200 ,  300  interlocking chain type forward and backward actuating device 
           110 ,  310  interlocking chain 
           110 A,  210 A,  310 A chain disengagement part 
           110 B,  210 B,  310 B rigid chain part 
           111 ,  211 ,  311 ,  311 A,  311 B inner tooth plate 
           112 ,  212 ,  312 ,  312 A,  312 B outer tooth plate 
           112 S outer plate face 
           113 ,  113 A,  113 B,  213 A,  213 B,  313 ,  313 A,  313 B coupling pin 
           120 ,  320  driven body 
           130 ,  230 ,  330  chain guide plate 
           131 ,  231 ,  331  chain guide 
           131 A,  231 A,  331 A disengagement part guide 
           131 B,  231 B coupling pin passage 
           131 S,  331 S grooved bottom face 
           132 ,  332  inlet of chain guide 
           132 A,  332 A edge of inlet of chain guide 
           140 ,  240 ,  340 A,  340 B chain locus regulating member 
           150  spacer 
           314  bushing 
           331 B guide for rigid chain part 
           333  chain guide plate face 
         A chain disengagement direction 
         B rigid chain direction 
         D distance between chain guide plates 
         G installation face 
         S 1 , S 2 , S 3  chain locus regulating face 
         S 4  chain width direction regulating face 
         SP 1 , SP 3  drive sprocket 
         W chain width direction 
         WA guide width of disengagement part guide 
         WB passage width of coupling pin passage