JP2000016766A - Motor driven elevating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a motor driven elevating device for reducing the number of part items, having simple constitution, and also easily working a lock bar. SOLUTION: A main body side contact mount 21 energized downward by a back pressure spring 35 is vertical-movably fitted to a main body part 1. A locking means for holding an elevating part 2 at an elevated position is equipped with one lock bar 12 fixed to the main body part, and a pair of lock claws 44 fitted to the elevating part to be energized by a lock spring. The lock bar is formed by providing a first stepped portion 17, hooked by the lock claws, on the upper side of a large-diameter part 14 to range with a middle- diameter part 15, and also a second stepped portion 18 on the upper side of the middle-diameter part to range with a small-diameter part 16. A lock bar through hole 28, having a hole smaller than that of the stepped portion 18 and penetrated by the small-diameter part 16, is provided on the center part of the mount 21. The mount 21 is positioned when the small-diameter part is passed through the hole 28 to downward fix the rod 12 to the main body part 1, and the hole edge of the hole 28 is hooked to the stepped portion 18 from the upper side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric hoisting apparatus for elevating electric equipment such as a mercury lamp illuminator installed at a height above a ceiling of a gymnasium for maintenance or the like.

[0002]

2. Description of the Related Art In FIG. 8 and FIG. 9 showing a main part of an electric lifting device according to a conventional example, reference numeral 101 denotes a base of a main body arranged at a high position on the ceiling side, and a pair of left and right stopper means below this. A main body side contact stand 103 having a plurality of contacts 103a is mounted via 102. Both stopper means 102
The contact base 103 projects downward from the base 101 and
And a washer-shaped stopper member 102b screwed to the lower end of the shaft 102a. A pair of guide shafts 104 projecting downward from the base 101 are penetrated through the contact base 103,
The main body side contact base 103 is urged downward by a back pressure spring 105 provided by individually winding these guide shafts 104. The height position where the contact base 103 hits the stopper member 102 from above is the lower limit height position. The main body side contact base 103 does not fall below the lower limit height position and can move up and down from the lower limit height position.

At the center of the lower surface of the base 101, a trumpet-shaped introduction guide 106 extending downward is attached. One lock claw 107 into which a toe is inserted is pivotally attached to the introduction guide 106, and this claw 107 is urged by a lock spring 108.

[0004] In FIGS. 8 and 9, reference numeral 111 denotes an elevating unit, which is wound around the main body 101 and the elevating unit 111, and is wound and unwound by a drive mechanism (not shown) in the main body 101. It is moved up and down with respect to the base 101 via the wire rope 112. By this elevating, the lighting fixture (not shown) connected to the lower side of the elevating unit 111 can be lowered to the floor side, and maintenance such as lamp replacement can be performed. On the upper surface of the elevating unit 111, an elevating unit side contact table 113 is provided.
A plurality of contacts 113a included in the elevating unit 113 are elastically contacted with the contacts 103a when the elevating unit 111 is disposed at the ascending position shown in FIG. The power supply to the lighting equipment is enabled. Further, a guide hole 114 is formed in the upper surface of the elevating unit 111, into which the tip of the guide shaft 104 enters when the elevating unit 111 is disposed at the ascending position.

[0005] At the center of the elevating section 111, a single lock rod 115 protruding vertically upward from the upper surface thereof is attached. The side surface of the rod 115 is provided with a first groove portion 116 and a second groove portion 117 which is connected to a lower portion of the rod portion 115 and is deeper than the first groove portion 116. This lock rod 115,
Introduction guide 106, lock claw 107, lock spring 1
Reference numeral 08 denotes a lock unit that holds the elevating unit 111 at the above-described raised position as the wire rope 112 is wound up and rewinded, and enables the elevating unit 111 to be lowered from this raised position.

When the lifting unit 111 is located at the ascending position, the locking means operates as shown in FIG.
The toe portion 07 is hooked on the first groove portion 116 of the lock rod 115 inserted into the introduction guide 106 to mechanically support (lock) the elevating portion 111, and the wire rope 112 is used for the elevating portion 111 and the lighting fixture. Prevents loading. When lowering the elevating unit 111 to the floor side for maintenance or the like, the wire rope 112 is first wound up slightly, and the toe of the lock claw 107 is positioned in the second groove 117, and then the wire rope 112 is rewound. Thereby, the lock of the lock bar 115 by the lock claw 107 can be released (unlocked). Thereby, the elevating unit 111 and the lighting fixture can be lowered to the floor side.

[0007] As described above, the locking means mainly composed of one lock rod 115 and the lock claw 107 engaged and disengaged therefrom is small, so that it is installed on a high ceiling having a height of, for example, 10 m or less. It is suitable for downsizing a motorized lifting device for lifting relatively small lighting equipment of 400 W or less.

[0008]

However, in the locking means, the first and second grooves 1 are formed on the side surfaces of the lock rod 115.
Although it is necessary to provide the grooves 16 and 117 continuously with each other, these grooves 116 and 117 need to be formed by groove processing using a milling machine or the like separately from the outer diameter processing of the lock rod 115, so that the processability is poor. . Moreover, in the electric lifting device having the above-described configuration, the main body side contact stand 1 urged downward by the back pressure spring 105 when the lifting portion 111 is lowered.
Since the stopper means 102 for holding the 03 at its lower limit height position is provided in a pair on the left and right, and each is formed by combining a plurality of parts, the number of parts of the entire apparatus is large and the structure is complicated. is there. In addition, since the back pressure spring 105 has a pair of right and left sides, the number of parts of the entire apparatus further increases, and the structure is complicated.

SUMMARY OF THE INVENTION Accordingly, a first object of the present invention is to provide an electric lifting device which can reduce the number of parts, has a simple structure, and can easily process a lock rod.

A second problem to be solved by the present invention is as follows.
In order to solve the first problem, it is an object of the present invention to provide an electric lifting device capable of further reducing the number of components.

A third problem to be solved by the present invention is as follows.
An object of the present invention is to provide an electric lifting / lowering device capable of accurately detecting the winding and rewinding timing of a wire rope while solving the first or second problem.

[0012]

According to the present invention, there is provided a main body having a drive mechanism for winding and rewinding a wire rope and disposed at a high position on a ceiling side, and a stopper provided on the main body. A lower-limit height position is regulated, and a main-unit-side contact block provided on the main unit so as to be vertically movable above the lower-limit height position; and a main-unit-side contact block provided on the main unit. A contact base guide for guiding the vertical movement of the main body, a back pressure spring for urging the main body side contact base provided on the main body toward the lower limit height position, and the main body via the wire rope , A lifting / lowering portion side contact block provided in the lifting / lowering portion and coming in contact with / separating from the lower side of the main body portion side contact block, a lock claw and a lock bar biased by a lock spring Winding and rewinding the wire rope Lock means for holding the elevating portion at its raised position by the hook between the lock claw and the lock bar, and enabling the elevating portion to descend from the up position by releasing the hook. It is assumed that an electric lifting device is used.

[0013] In order to solve the first problem, the invention according to claim 1 is characterized in that a plurality of the lock claws are attached to the elevating section using a plurality of the lock claws, and the lock rod is formed as a single rod. The rod is provided with a first step on which the lock claw is hooked above the large diameter part to connect the middle diameter part, and a second step which forms the stopper means is provided above the middle diameter part to connect the small diameter part. Forming a lock rod through hole on the main body portion side contact base having a diameter smaller than the second step and penetrating the small diameter portion, and passing the lock rod downward toward the main body portion through the small diameter portion in the through hole. It is characterized by being fixed to.

According to the first aspect of the present invention, when the elevating unit is mechanically locked to the ascending position to be supported by winding the wire rope, the pair of lock claws of the elevating unit is locked by a lock spring. After being pushed obliquely downward at the large-diameter portion of the lock bar while accumulating biasing force, the lock bar engages with the middle-diameter portion of the lock bar, and in this state the wire rope is rewound and the elevating portion is lowered once. Accordingly, the tips of the pair of lock claws are hooked from above on the first step bordering the large-diameter portion and the middle-diameter portion, so that the lifting portion is mechanically held at the raised position by this engagement (locking). ). Once the wire rope is slightly wound up from this locked state and the elevating part is raised, the toes of the pair of lock claws face the small-diameter portion of the lock rod. To release the locked state, and assume a posture in which it can be rotated in any direction. After this, the wire rope is rewound and the elevating unit is lowered, so that both the pair of lock claws are turned obliquely upward according to contact with the large diameter portion and the medium diameter portion of the lock rod, It can be disengaged from the lock bar and descend below the main body.

The locking rod of the locking means for performing the above-described locking operation and releasing operation has a large diameter portion, a medium diameter portion, and a small diameter portion connected to each other. A lock state is obtained by the lock claw being hooked on the first step between them, and the lock can be released by the small diameter portion connected to the middle diameter portion with the second step provided, so that such an operation is realized. Therefore, it is not necessary to machine two grooves having different depths on the side surface of the lock bar.

In the locking operation, the elevating / lowering unit-side contact block pushes up the main unit-side contact block in the main unit against the urging force of the back pressure spring. It is pushed down by the urging force of the spring. Such vertical movement of the main body side contact stand is guided by a contact stand guide. As described above, when the elevating part is lowered and the main body side contact block is pushed down by the back pressure spring, the hole edge of the lock rod through hole of the elevating part is at the boundary between the middle diameter part and the small diameter part of the lock rod. From the upper side. With this hook, the main body side contact block can be held at the lower limit height position by using the lock bar as a stopper.

In order to solve the second problem, a second aspect of the present invention depends on the first aspect of the present invention, wherein a single back pressure spring surrounding a small diameter portion of the lock rod is provided. It is characterized by using a coil spring. According to the second aspect of the present invention, since only one back pressure spring for urging the main body side contact base downward is used, the number of parts can be further reduced.

In order to solve the third problem, the invention according to claim 3 which depends on the invention according to claim 1 or 2 uses at least one set of the contact point guides and moves them around the lock rod. At a point symmetrical position, a slidable contact is provided on the side surface of the main body side contact stand, and a detected convex portion is protruded at the center of the side surface, and a sensor for detecting this convex portion is provided in the main body portion. A detecting means for detecting the height position of the main body side contact block by the detected convex portion and the sensor is formed.

The third aspect of the present invention is the first aspect or the second aspect.
In addition to the functions of the invention of the present invention, the following functions are provided. That is, the contact point guides arranged at the point symmetrical positions as described above suppress the main body side contact block from tilting in the width direction when the main body side contact block moves up and down. Guide up and down movement. As described above, the sensor detects the detected convex portion protruding from the center of the side surface of the main body-side contact block whose inclination in the width direction is suppressed. The detection accuracy of the height position of the wire rope can be enhanced, and the winding and rewinding operations of the wire rope at the time of the locking operation and the unlocking operation described above can be performed.

In carrying out the invention of claim 3,
The sensor may be attached to the contact point guide as in the invention according to claim 4 dependent on this invention. In this case, the number of parts is not increased because the parts for mounting the sensor are not particularly required in the main body, and the main body side contact block guided up and down by the guide based on the contact block guide is used. The positional relationship with the sensor can be set easily and accurately.

Similarly, in practicing the third aspect of the present invention, a connecting portion is provided at a lower end of the contact point guide as in the fifth aspect of the present invention or the fourth aspect of the present invention. It is preferable to connect an introduction guide that guides the elevating unit that rises by winding the wire rope to the main body unit side contact block to the connecting unit. In this case as well, since the introduction guide can be easily guided to an appropriate position by mounting with the contact base guide as a reference, even if the elevating part rises while swinging, the main body is kept in the proper posture by the introduction guide. It can be guided smoothly in the direction of the unit side contact stand, and the locking operation at the raised position can be ensured.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 and 2 and the like, the electric lifting device includes a metal main body 1 disposed at a high position on the ceiling side of a room such as a gymnasium, and a lower portion of the main body 1 with respect to the main body 1. An elevating unit 2 which is raised and lowered over an ascending position supported by a main body unit 1 through a locking means described later and a descending position on the floor side
And An electric device (not shown), for example, a relatively small mercury lamp lighting device (not shown) of 400 W or less is attached to the lower surface of the elevating unit 2, and is moved up and down together with the elevating unit 2.

The main body 1 is formed by incorporating a drive mechanism 6 for winding and rewinding a wire rope 5 in a housing 4 on which a handle 3 for mounting to a ceiling is mounted.
The housing 4 is attached by separately closing both ends of a square cylindrical body formed by the base 4a, the cover 4b, and the base 4a and the cover 4b shown in FIGS. And a pair of end plates 4c, and a hole 7 is formed in the bottom wall of the cover 4b.

As shown in FIG. 2, the driving mechanism 6 includes an electric motor 6a fixed to the base 4a and capable of rotating forward and reverse,
Gear reducer 6b connected to the motor shaft of this motor 6a
And a winding drum 6c attached to the output shaft of the speed reducer 6b. One end of a wire rope 5 wound on the winding drum 6c is connected to the winding drum 6c.
The other end of the wire rope 5 is fixed to a wire fixing portion (not shown) in the main body 1, and an intermediate portion of the wire rope 5 is a hole 7.
Through the main body 1 to support the elevating unit 2 as described later. Reference numeral 8 in FIGS. 2, 6, and 7 denotes a guide roller for routing the wire rope.

As shown in FIGS. 2 and 3, the base 4a
A pair of sheet metal guides 11 is fixed to the lower surface of the upper wall by screws or the like at a distance from each other. The two guide bodies 11 have a pair of contact point guides 11a and 11b that are parallel to each other and extend in the vertical direction, are bent into a substantially U-shape, and are connected to lower ends of these two guides 11a and 11b. A portion 11c is provided. The connecting portion 11c is formed by a bent piece obtained by bending the lower ends of the guides 11a and 11b at right angles in a direction away from each other.

In the present invention, the guides 11a and 11b may be cut and raised from the base 4a to be provided integrally, and the guides 11a and 11b may be independent parts and may be fixed to the base 4a. When each of the guides 11a and 11b is an independent part with respect to the base 4a, it is not possible to form the guide 11 as an integral part in which the two guides 11a and 11b are continuous in a U-shape as in the present embodiment. ,
It is excellent in that the number of parts and the number of assembling steps can be reduced, and the mutual positional relationship between the opposing guides 11a and 11b is easily maintained properly.

One contact base guide 11a of one guide body 11 and another contact base guide 11b of the other guide body 11 are arranged at point-symmetrical positions about a lock rod 12 described later. Similarly, the other contact base guide 11b of the one guide body 11 has
The one contact point guide 11a of the other guide body 11 is also arranged at a point symmetrical position about a lock rod 12 described later. In the present invention, it is sufficient that the contact point guide has at least two guides 11a and 11b arranged at the point symmetric positions.
The use of two or more sets (four pieces) is advantageous in that a later-described main body side contact stand 21 can be prevented from moving in a horizontal plane, and the contact stand 21 can be held in a predetermined posture. I have.

One metal lock rod 12 is disposed between the pair of guides 11. This lock rod 12
Is fixed by projecting downward from the base 4a by a screw 13 that is screwed into the lock rod 12 through the center of the base 4a (see FIGS. 6 and 7). As shown in FIG. 4 and the like, the lock bar 12 has a large diameter portion 14 at the lowermost position at a lower portion thereof, a medium diameter portion 15 positioned at an upper side thereof,
And a small-diameter portion 16 located above the middle-diameter portion 15. Thus, a first step 17 is formed at the boundary between the large diameter portion 14 and the middle diameter portion 15 having a smaller diameter, and the boundary between the middle diameter portion 15 and the small diameter portion 16 having a smaller diameter is formed. Is formed with a second step 18, so that
The lock bar 12 has a stepped cylindrical shape. The leading edge of the large diameter portion 16 protruding below the connecting portion 11c is chamfered.

In the main body 1, a main body side contact stand 21 is provided so as to be vertically movable. As shown in FIG. 4 and the like, the contact base 21 is formed by mounting contacts 23 at several positions on a contact base body 22 having a rectangular shape in plan view formed by molding a heat-resistant hard synthetic resin. Each contact 23 is exposed below the contact base body 22. Rope through holes 24 through which the wire rope 5 penetrates are formed at both longitudinal ends of the contact base 22.

One side 22a on both sides in the width direction of the contact base body 22
At the center in the longitudinal direction, first and second detected convex portions 25 and 26 are integrally provided to protrude from the pair of guide bodies 11. These convex portions 25 and 26 extend in the up-down direction and are provided in parallel with each other, and have different lengths. In this embodiment, the upper ends of the convex portions 25 and 26 are continuous via a continuous portion 27. The first detected convex portion 25 is used for detecting the height position of the main body side contact stand 21 during the locking operation described later, and the second detected convex portion 26 is used for detecting the main body side contact stand during the unlock operation. 21 is used to detect the height position.

As shown in FIG. 4 and the like, a lock rod through hole 28 is formed at the center of the contact base body 22. The size (diameter) of the through hole 28 is larger than the small diameter portion 16 of the lock rod 12 and smaller than the middle diameter portion 15.

The main body-side contact stand 21 having the above-described structure has contact side guides 11a, 11b of the guide body 11 on both sides.
And the small diameter portion 16 of the lock rod 12 penetrates the lock rod through hole 28. For this reason, the contact base 21 includes a plurality of contact base guides 11.
In the present embodiment, the lock rod through hole 28 also slides along the small diameter portion 16 while being provided so as to be able to move up and down along a and 11b. Then, due to the dimensional relationship between the lock rod through hole 28 and the middle diameter portion 15, the hole edge of the through hole 28 is caught from the upper side by the second step 18 of the lock rod 12, and is regulated so as not to drop downward. The main-unit-side contact stand 21 is provided so as to be able to move up and down above the restricting position, in other words, above the second step 18 as the lower limit position. Therefore, the lock rod 12
The second step 18 forms stopper means for the main body side contact stand 21.

The first and second detected convex portions 25 and 26 slide on opposing edges 11d (see FIG. 3) of the pair of guide bodies 11. Thus, the main body-side contact stand 21 is prevented from tilting and moving in the longitudinal direction such that one end in the longitudinal direction is higher than the other end by using the two guide bodies 11 as stoppers, and the vertical movement of the contact stand 21 is smoothly performed. It is excellent in that it can be performed and that the detection accuracy of the height position described later can be improved.

As shown in FIG. 4, two contact stand guides 11a and 11b contacting one side surface 22a of the contact stand main body 22.
, A first micro switch 31 as a first sensor and a second micro switch 32 as a second sensor are individually mounted. The first micro switch 31 for detecting the ascending position is provided on the contact base guide 1 on the first detected convex portion 25 side.
1a, the actuator is switched from the off state to the on state when the actuator is pressed by the first detected convex portion 25. The second micro switch 32 for unlocking is connected to the second detected convex portion 26.
The actuator is screwed to the contact guide 11b on the side, and its actuator is elastically pressed and held by the second detected convex portion 26. In this pressed state, the switch 32 is turned on, and the switch 32 is turned off when the curved tip of the actuator is hooked on the upper end and the lower end of the second detected convex portion 26. The forward / reverse rotation of the electric motor 6a is performed in accordance with the on / off switching of the micro switches 31 and 32.

A back pressure spring 35 is provided in the main body 1 to urge the main body side contact stand 21 toward the lower limit height position. A single coil spring is used as the spring 35. The spring 35 surrounds the small diameter portion 16 of the lock rod 12 between the base 4a and the main body side contact stand 22 as shown in FIGS. Are elastically deformed. Although a plurality of back pressure springs 35 may be used in the present invention, using a single back pressure spring as in the present embodiment is excellent in that the number of parts can be reduced and the number of assembling steps can be reduced. This back pressure spring 35 is disposed between the pair of guide bodies 11 as shown in FIG.

The plurality of contact point guides 11a, 11b
2 and 3, an introduction guide 38 made of a synthetic resin is connected via a screw which is screwed into each of the connection portions 11c through the guide 38 from below. The introduction guide 38 has a positioning cylindrical part 38a into which the elevating unit 2 can be fitted in accordance with the outer shape of the elevating unit 2.
And a skirt portion 38b which is continuous with the lower side, and a guide convex portion 38c for smoothly guiding the elevating portion 2 from the skirt portion 38b toward the cylindrical portion 38a. The introduction guide 38 protrudes below the main body 1 through the hole 7 as shown in FIG. The intermediate portion of the wire rope 5 passes through the inside of the introduction guide 38.

As shown in FIGS. 1 and 5 and the like, the upper surface of the elevating unit 2 is formed by an elevating unit side contact stand 41, and the elevating unit 41 is provided with a number of contacts 42 corresponding to each of the contacts 23. Have been. At least one of the contacts 23, 42 is urged by a spring (not shown), and the corresponding contacts 23, 42 can elastically maintain a contact state with each other.

A groove 2a is provided at the center of the elevating part 2 so as to be open to the upper surface of the elevating part 2 and to allow the lower part of the lock bar 12 to be inserted and removed from the upper side. A lock claw 44 is individually rotatably mounted on each of the pair of shafts 43 arranged in the groove 2a, and a lock spring 45 is individually mounted. Each lock spring 45
As shown in FIG. 6A, the toes of the lock claws 44 are held so as to face each other, and a spring force is accumulated when the lock claws 44 are rotated from this state. These shaft 43, lock claw 44, lock spring 4
5 and the lock bar 12 form a lock means. By this means, the winding of the wire rope 5
With the rewinding, the lifting unit 2 can be held at the raised position or lowered from the raised position as described later.

A pair of guide rollers 46 are built in the elevating section 2, and the guide rollers 46 extend the intermediate portion of the wire rope 5. Thereby,
The elevating part 2 suspended at the middle part of the wire rope 5 is raised and lowered with the winding and rewinding of the wire rope 5.

The elevating unit 2 is moved up and down in accordance with an operation on an operation panel installed on the floor side. Next, a locking operation for mechanically supporting the lifting unit 2 that rises from the floor side to the ceiling side to the main body unit 1 will be described with reference to FIG.

FIG. 6A shows a state in which the elevating section 2 is raised to a position close to the main body 1 by winding the wire rope 5, and FIG.
In this state, no load acts on the pair of lock claws 44,
Their toes are facing each other.

When the elevating unit 2 moves up in this state, the elevating unit 2 is guided by the introduction guide 38, and the upper part thereof is introduced into the positioning cylindrical portion 38 a of the introduction guide 38. Therefore, even if the elevating part 2 is shaking due to wind or the like while ascending, or the wire rope 5 is slightly twisted, the elevating part 2 is surely caught by the introduction guide 38 regardless of those, and The part 2 can be introduced into the main body part 1 with an appropriate posture.

As the lifting unit 2 moves up, the contact 42 of the contact unit 41 on the lifting unit presses the contact 23 of the contact table 21 on the main unit side. The table 21 starts to be pushed up against the urging force of the back pressure spring 35. At this time, the lower end of the lock bar 12 is inserted into the groove 2a of the elevating unit 2 as shown in FIG.
At the same time, the lock springs 45 are twisted to store the spring force and urge the lock claws 44 in the direction of returning to the original position.

Subsequently, the lifting unit 2 is lifted up.
As shown in FIG. 6C, the large diameter portion 14 of the lock rod 12
Is inserted downward between the pair of lock claws 44, and the middle diameter portion 15 of the lock bar 12 is sandwiched between the pair of lock claws 44 that are inclined obliquely downward. In this case, since the main body side contact stand 21 is pushed up by the elevating part 2,
The first detected convex portion 25 pushes the actuator of the first micro switch 31, and the switch 31 changes from off to on. That is, the arrival of the elevating section 2 together with the main body side contact stand 21 to the ascending position (lock position) is detected by the detecting means including the projection 25 and the switch 31. The wire rope 5 is rewound by the reverse rotation of the wire rope 6a. With the rise of the main body-side contact stand 21 described above, the actuator of the second micro switch 32 is pushed by the second detection convex portion 26 before the first micro switch 31 is turned on, and this switch 32 Is switched from the off state to the on state, and this on state is maintained even when the first micro switch 31 is switched on.

FIG. 6D shows a state in which the lifting of the elevating unit 2 to the lock position is detected as described above, and the wire rope 5 is rewound. In other words, as the elevating unit 2 is lowered by rewinding, the height position of the pair of lock claws 44 in the obliquely downward position, in which the toe portion has been in contact with the middle diameter portion 15 of the lock bar 12, is also lowered. The toe hooks on the first step 17 of the lock bar 12 from above. Then, immediately after that, the wire stroke 5 is loosened, so that the operation of the electric motor 6a of the drive mechanism 6 is stopped by detecting it by the looseness detection mechanism (not shown). Accordingly, the lifting unit 2 is mechanically supported (locked) by the locking means via the locking means, and is held at the raised position without dropping downward. In this locked state, the lifting unit 2 is attached to the wire rope 5. 2 and the weight of the luminaire supported by the same are not increased.

As described above, when the elevating unit 2 is lowered from the state shown in FIG. 6C to the state shown in FIG. 6D, and in the locked state thereafter, the urging force of the back pressure spring 35 applies. Since the electrical contact state of the contacts 23 and 42 is maintained, it is possible to obtain the elevating unit 2 from the main body unit 1 via these and to make it possible to energize the lighting fixture, thereby using the lighting fixture.

Next, the operation of lowering the elevating unit 2 from the ceiling side to the floor side will be described with reference to FIG.

FIG. 7A shows the locked state shown in FIG. 6D. In this state, the electric motor 6a
Is normally rotated, and the wire rope 5 is once wound up, so that first, as shown in FIG. This state is shown in FIG.
This is the same as the state shown in FIG. Then, as the main body unit side contact stand 21 is pushed up together with the elevating unit 2, a pair of lock claws 44 are provided above the first step 18 of the lock rod 12 as shown in FIG. Is located. Then, the pair of lock claws 44 is locked with the lock spring 45.
Is rotated upward so as to maintain a substantially horizontal posture by the spring force of
The toe 4 faces the small diameter portion 16 of the lock rod 12.

At this point, since the actuator of the second micro switch 32 detects the lower end of the second detected convex portion 26, the switch 32 changes from on to off. That is, the state in which the lock is released is detected by the detecting means including the convex portion 26 and the switch 32.

As a result, the electric motor 6a is rotated in the reverse direction, the wire rope 5 is rewound, and the elevating unit 2 is lowered. At this time, the pair of lock claws 44 is
8 and also as shown in FIG. 7 (D), it is rotated obliquely upward against the first step 17.
It does not hinder the lowering of the elevating unit 2. Therefore, as the wire rope 5 is rewound, the lifting unit 2 can be lowered to the floor together with the lighting equipment. Accordingly, the pair of lock claws 44 comes off below the large-diameter portion 14 of the lock rod 12 and at the same time, they are caused by the spring force of the lock spring 45 as shown in FIG.
The state is returned to the state of FIG.

When the elevating section 2 is lowered in this way, the main body side contact stand 21 which is pushed downward by the back pressure spring 35 is also pushed down.
When the edge of the hole 8 comes into contact with the second step 18 of the lock bar 12 from above, the second step 18 is used as a stopper and lowers from the lower limit height position defined by the height position of the second step 18. Is prevented.

As described above, in the electric lifting device having the above-described configuration, the pair of lock claws 44 of the lifting portion 2 are provided on the first step 17 between the large diameter portion 14 and the middle diameter portion 15 of the lock rod 12. The lifting unit 2 can be mechanically locked to the main body unit 1 by being hooked from both sides in the radial direction.
5 by providing a pair of lock claws 44 to the small diameter portion 14 which is continuous with the second step 18 provided.
Of the main body 1 can be released.

Therefore, in order to realize the lock operation and the release operation for the elevating unit 2, the lock rod 12 is required.
It is not necessary to machine two grooves having different depths on the side surfaces of the lock rod 12, and the machining of the lock rod 12 may be performed simply by machining a portion having a different outer diameter. Therefore, the lock bar 12 can be easily processed, and the cost can be reduced accordingly.

As described above, when the main body side contact base 21 is pushed down by the back pressure spring 35 when the elevating unit 2 is lowered, the edge of the lock rod through hole 28 of the elevating unit 2 is locked. From the upper side of the second step 18 of the
Is held at its lower limit height position, so that the lock rod 12 can be used as stopper means. Therefore, it is not necessary to use any special parts for forming the stopper means, so that the number of parts and the number of assembling steps can be reduced, the cost can be reduced, and the configuration of the apparatus can be simplified.

Further, in order to detect the height position of the elevating unit 2 associated with the elevating operation, the elevating unit 2 in the main body 1 is detected.
The contact base guides 11a and 11b that guide the vertical movement of the main body side contact base 21 following the movement of the main body side can suppress the main body side contact base 21 from tilting in the width direction. The first and second detected convex portions 25 and 26 projecting from the center of the side surface 21a of the main body side contact base 21 that smoothly moves up and down while the inclination in the width direction is suppressed as described above are provided. Then, the first and second micro switches 31 and 32 detect the height position of the main body side contact base 21. Therefore, it is possible to improve the accuracy of detecting the height position of the main body side contact base 21 which is moved up and down following the elevating unit 2 and, consequently, the height position of the elevating unit 2. In addition, the winding and rewinding operations of the wire rope 5 during the releasing operation can be accurately performed.

In addition, the first and second microswitches 3
Since the bases 1 and 32 are attached to the contact base guides 11a and 11b, the main body side contact base 21 and the microswitches 31 and 32, which are vertically guided by the guides 11a and 11b based on the contact base guides 11a and 11b, are provided. Can be set easily and accurately. Therefore, not only can the height position detecting means be made compact, but also the winding and rewinding operations of the wire rope 5 at the time of the above-described locking operation and its releasing operation can be performed accurately.

Further, since the first and second microswitches 31 and 32 are mounted on the contact point guides 11a and 11b as described above, there is no special need for a sensor mounting part in the main body 1, and These guides 11a, 11
Since the introduction guide 38 is screwed to the connecting portion 11c at the lower end of b, there is no particular need for a part for fixing the introduction guide 38 to the main body 1. Therefore, the structure can be simplified without increasing the number of parts.

[0059]

The present invention is embodied in the form described above and has the following effects.

According to the first aspect of the present invention, the lock for mechanically holding the elevating portion at the ascending position and the locking means for releasing the lock are provided between the large diameter portion and the medium diameter portion of the lock rod. Since the lock claw is hooked on the first step, the locked state can be obtained, and the locked state can be released by the small diameter portion connected to the middle diameter portion by providing the second step. It is sufficient to machine the portions having different outer diameters, and it is not necessary to machine two grooves having different depths on the side surfaces of the lock bar as in the related art, and the lock bar can be easily machined. Moreover, since the hole edge of the lock rod through hole of the main body side contact block is caught by the second step of the lock rod, the main body side contact block is held at the lower limit height position, so that the lock rod is used as stopper means. Therefore, the number of parts can be reduced and the structure can be simplified.

According to the second aspect of the invention dependent on the first aspect of the invention, in addition to the effect of the first aspect of the invention, the number of back pressure springs is minimized, so that the number of parts is further reduced. The structure can be simplified.

The third aspect of the present invention is dependent on the first or second aspect of the invention.
The invention according to claim 3, which is dependent on the invention according to claim 3
According to the invention described in (1) and (5), which is dependent on the invention of (3) or (4), in addition to the effect of the invention of (1) or (2), the main body side contact block is moved in the width direction. When the main body side contact base moves up and down while suppressing the inclination of the main body side contact, the detected convex part protruding from the center of the side surface where the movement is the least moves is detected by the sensor, and the main body side contact moved up and down Since the height positions of the table and the elevating unit are detected, it is possible to accurately obtain the timing of winding and rewinding the wire rope during the lock operation and the release operation.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of an electric lifting device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of the electric lifting device shown in FIG. 1 with a cover of a main body part thereof being removed.

FIG. 3 is an enlarged perspective view showing a configuration of a main body side of the electric lifting device shown in FIG. 1;

FIG. 4 is a perspective view showing a mutual relationship among a lock rod, a back pressure spring, and a main body side contact block in the configuration on the main body side shown in FIG. 1;

FIG. 5 is a perspective view showing a configuration of a lifting unit of the electric lifting device shown in FIG. 1;

6 (A) to 6 (D) are schematic sectional views sequentially showing a locking operation of a locking means of the electric lifting / lowering device shown in FIG. 1;

FIGS. 7A to 7D are schematic cross-sectional views sequentially showing the unlocking operation of the lock means of the electric lifting device shown in FIG.

FIG. 8 is a perspective view showing a configuration of a main part of an electric lifting device according to a conventional example.

FIG. 9 is a front view showing a configuration of a main part of a motor-driven lifting device according to a conventional example, partially sectioned.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main body part, 2 ... Elevating part, 5 ... Wire rope, 6 ... Drive mechanism, 11a, 11b ... Contact point guide, 11c ... Connecting part, 12 ... Lock rod (lock means), 14 ... Large diameter part, 15 ... Medium diameter part, 16 ... small diameter part, 17 ... first step, 18 ... second step, 21 ... body part side contact stand, 22a ... side surface of body part side contact stand, 25 ... first detected convex part, 26 ... Second detected convex portion, 28: lock rod through hole, 31, 32: micro switch (sensor), 35: back pressure spring, 38: introduction guide, 41: elevating section side contact stand, 43: shaft (lock means) , 44: lock claw (lock means), 45: lock spring (lock means).

Claims (5)

[Claims] 1. A main body having a drive mechanism for winding and rewinding a wire rope and disposed at a high position on the ceiling side, and a lower limit height position is regulated by stopper means provided on the main body. And a main body side contact base provided on the main body part so as to be vertically movable above the lower limit height position; and a contact base provided on the main body part and guiding the main body side contact base to move up and down. A guide, a back-pressure spring for urging the main body-side contact base provided on the main body toward the lower limit height position, and an elevating unit that moves up and down with respect to the main body via the wire rope A lifting / lowering unit-side contact block provided on the lifting / lowering unit and coming into contact with / separating from the lower side of the body-unit-side contact block; and a lock claw and a lock bar biased by a lock spring,
The lifting and lowering portion is held at its raised position by the hook between the lock claw and the lock bar accompanying the winding and rewinding of the wire rope, and the lifting and lowering portion is lowered from the raised position by releasing the hook. And a locking means for enabling the lifting and lowering device, wherein a plurality of the locking claws are used to attach the locking claws to the lifting and lowering unit, and the locking rod is made one, and the locking rod is located above the large diameter part. A first step on which the lock claw is hooked is provided to connect the middle diameter portion, and a second step serving as the stopper means is provided above the middle diameter portion to form a continuous small diameter portion; A lock rod through-hole having a diameter smaller than the second step and through which the small-diameter portion penetrates is provided in the contact stand, and the lock rod is fixed downward to the main body portion side through the small-diameter portion in the through-hole. An electric lifting device. 2. The electric lifting and lowering device according to claim 1, wherein a single coil spring disposed around a small diameter portion of the lock rod is used as the back pressure spring. 3. At least one set of the contact base guides is provided so as to be slidable on a side surface of the main body side contact base at a point symmetrical position around the lock rod, and a central portion of the side surface is provided. A protruding portion to be detected is provided on the main body portion, and a sensor for detecting the protruding portion is provided in the main body portion, and a detecting means for detecting the height position of the main body portion side contact base by the detected protruding portion and the sensor is formed. The electric lifting device according to claim 1 or 2, wherein: 4. The electric lifting device according to claim 3, wherein said sensor is mounted on said contact point guide. 5. A connecting portion is provided at a lower end portion of said contact point guide, and an introduction guide for leading said elevating portion raised by winding up said wire rope to said main body side contact point is connected to said connecting portion. The electric lifting device according to any one of claims 1 to 4, characterized in that: