JP4543944B2 - lift device - Google Patents

Description

  The present invention relates to a lifting device having a lighting fixture as a body to be lifted, for example.

  For example, in a lifting device that lifts and lowers a lighting fixture suspended by a suspension material from a lifting device body equipped with a winding device fixed to a building structure, conventionally, means for safety are provided as follows. Yes.

  A conventional example (see, for example, Patent Document 1) will be described with reference to FIG. In this lifting device, in a suspension support device at the tip of a wire 53 that is a suspension, two coil springs 50 are respectively supported by columnar protrusions 51, and a fixed portion 52 that serves as a suspension support bracket on the coil spring 50. , The wire 53 is passed between the coil springs 50 of the fixing portion 52 and locked by the holding means 55, and the operation piece 54a of the detection switch 54 is pressed on the upper surface of the fixing portion 52. When an overload is applied to the wire 53, the coil spring 50 is compressed by the fixing portion 52, and the fixing portion 52 is lowered and separated from the operation piece 54 a of the detection switch 54. For this reason, the detection switch 54 operates, the motor of the winding device that drives the wire 53 is stopped, and the lifting and lowering of the lighting fixture suspended from the wire is stopped.

As described above, the lifting device has a function of detecting the magnitude of the tension of the wire 53 of the lighting fixture and stopping the winding of the wire 53.
JP-A-6-92599

  However, since this lifting device has a structure in which two protrusions 51 are raised and two coil springs 50 are used in order to balance, the space is increased and the number of parts is increased. Further, since the two coil springs 50 are used for support, the fixing portion 52 is easy to tilt and the detection accuracy by the detection switch 54 is poor.

  Accordingly, an object of the present invention is to provide an elevating device that is less likely to tilt the fixing portion, is compact, has a small number of components, and can be reduced in cost.

The lifting device according to the present invention includes a winding device having a drum that winds and unwinds the base end portion of the suspension material, and a suspension device that supports the distal end portion of the suspension material and has a detection unit that responds to a load applied to the suspension material. A material support device, a body to be lifted and lowered by the operation of the winding device suspended by the suspension material, and a detection switch for detecting a response operation of the detection unit,
The suspension material support device includes a cylindrical elastic body that is compressible in a cylinder axis direction and through which a distal end portion of the suspension material passes, and a distal end of the suspension material that is supported by the elastic body and passed through the elastic body A fixed portion that holds the portion, and a guide body that guides the fixed portion in its operating direction,
The guide body is a cylindrical body with a bottom, the elastic body is disposed at the bottom of the cylindrical body, the suspension member is passed through the bottom portion, and the suspension member is passed through the elastic body,
The fixed portion and the detection portion are substantially the same shape and face each other in the axial direction of the guide body, and the fixed portion and the detection portion are connected by a connecting portion to form a substantially U-shape in the axial direction of the guide body. The fixed portion has a notch through which the suspension member passed through the elastic body is inserted, and is fixed to the elastic body, and is attached to the tip of the suspension member inserted through the notch. A holding means is provided in the part, the holding means is locked to the notch of the fixing part by the gravity of the elevating body, the detection switch is fixed to the guide body, and the detection part is operated by the operation of the fixing part. The detection switch is operated.

Further, the suspension material support device includes a cylindrical elastic body that is compressible in a cylinder axis direction and through which a distal end portion of the suspension material passes, and a distal end of the suspension material that is supported by the elastic body and passed through the elastic body A fixed portion that holds the portion, and a guide body that guides the fixed portion in its operating direction,
The guide body is a cylindrical body with a bottom, the elastic body is disposed at the bottom of the cylindrical body, the suspension member is passed through the bottom portion, and the suspension member is passed through the elastic body,
The fixed portion and the detection portion are substantially the same shape and face each other in the axial direction of the guide body, and the fixed portion and the detection portion are connected by a connecting portion to form a substantially U-shape in the axial direction of the guide body. The fixed portion has a notch through which the suspension member passed through the elastic body is inserted, and is fixed to the elastic body, and is attached to the tip of the suspension member inserted through the notch. A holding means is provided in the part, the holding means is locked to the notch of the fixing part by the gravity of the elevating body, the detection switch is fixed to the guide body, and the detection part is operated by the operation of the fixing part. Activating the detection switch.

  According to the lifting device of the present invention, the fixed portion of the suspension member is supported by the cylindrical elastic body through which the suspension member is inserted, the detection portion is connected to the fixed portion, and the fixing portion is guided by the guide body. Is difficult to tilt, so that the detection accuracy can be improved.

  By making the fixing part and the detection part substantially the same shape and slidably storing them in the axial direction of the cylindrical guide body via the connecting body, the inclination of the fixing part and the detection part can be further suppressed.

  Since the notch through which the suspension material is passed is formed in the fixed portion, the suspension material such as a wire can be easily attached to and detached from the fixed portion, and assembly is facilitated.

  A first embodiment of the present invention will be described with reference to FIGS. In other words, the lifting device is disposed in a lifting device storage portion 1 provided in a building structure so as to open downward on the ceiling, for example. The main body 5 of the lifting device is provided with a winding device 2, a lighting fixture 3 that is a lifted body, and a suspension material support device 4.

  The winding device 2 has a drum 7 that winds and unwinds the proximal end portion of the wire 6 that is a suspension material, and also has a motor that drives the drum 7. The wire 6 drawn out from the drum 7 is wound around a pulley 26 that changes the direction of the wire 6 downward and is connected to the elevating part 3a of the luminaire 3.

  The luminaire 3 has a wire 6 wound around two pulleys 25 provided in the elevating part 3a.

  The suspension material support device 4 is attached to the main body 5 and supports the tip of the wire 6 wound around the lighting fixture 3. Thereby, the lighting fixture 3 is suspended by the wire 6 and moved up and down by the operation of the winding device 2.

  The suspension material support device 4 is configured as shown in FIGS. 2 to 4 and includes an elastic body, for example, a coil spring 9, a fixing portion 10, a detection portion 8, and a guide body 11 also serving as a detection device main body.

  The guide body 11 is a bottomed cylindrical body, and a coil spring 9 using a compression spring that is compressible in the axial direction is disposed at the bottom of the guide body 11. The tip of the wire 6 passes through the center of the coil spring 9 through the through hole 11 a that penetrates the bottom of the guide body 11. The fixing portion 10 is made of metal and has a slit-like notch 13 at the center, is supported by the coil spring 9, the tip end portion of the wire 6 is passed through the notch 13, and the holding means 18 is attached to the tip end portion of the wire 6. Are provided and locked to the fixing portion 10. As a result, the fixing portion 10 can respond to an overload applied to the wire 6.

  The detection unit 8 is connected to the fixed unit 10, and the fixed unit 10 and the detection unit 8 are formed in a disk shape that is substantially the same shape and partly missing, and is connected to each other by the connection unit 12 at the part where the disk is missing. And is substantially U-shaped as a whole so as to face each other via the connecting portion 12. The fixed portion 10 and the detecting portion 8 are slidably inserted into the guide body 11, and the fixed portion 10 is mounted on the upper surface of the coil spring 9 as described above.

  The detection switch 14 is fixed to the upper surface of the guide body 11, is installed so that the operating piece 14 a comes into contact with the state pressed by the detecting unit 8, and the operating piece 14 a is restored by the descending operation of the detecting unit 8. ing.

  As described above, the lifting device suspends the luminaire 3 between the wire 6 fed from the drum 7 of the winding device 2 and the suspension support device 4 via the pulley 26. When the motor of the winding device 2 is driven to rotate the drum 7 in the feeding direction, the wire 6 is fed and the lighting fixture 3 is lowered. On the contrary, when the drum 7 is rotated in the winding direction, the lighting fixture 3 is raised. In addition, when a load larger than the set load is applied to the wire 6 due to the lifting / lowering portion 3a of the lighting fixture 3 being caught by an object, the fixing unit 10 and the detection unit 8 that lock the holding means 18 at the tip of the wire 6 are guided. The inside of the body 11 is slid, the coil spring 9 is compressed to the state shown in FIG. 3, the detection unit 8 is lowered via the fixing unit 10, and the detection switch 14 is operated. The operation of the detection switch 14 stops the motor, and the lighting device 3 stops moving up and down. Thereby, winding of the wire 6 in an overload state can be prevented, use with a load higher than a set value or use in an abnormal state can be prevented, and safety can be achieved. Reference numeral 20 denotes a guide for the wire 6 provided in the vicinity of the suspension material support device 4.

  FIG. 5 shows a specific device of the lifting device, and the same reference numerals are given to the common parts with FIG.

  According to the first embodiment, the hoisting material support device 4 can always perform the lifting operation in a safe state and can stop when there is an abnormality. Further, since the fixed portion 10 of the suspension material supporting device 4 is guided and supported by the guide body 11, the inclination of the fixed portion 10 can be prevented and the coil spring 9 can be integrated into one, thereby reducing the number of parts. In addition, the structure is simplified, and compactness and low cost can be achieved.

  A second embodiment of the present invention will be described with reference to FIGS. That is, the guide body is formed by a plurality of parallel shafts 11a to 11d. The fixed portion 10 and the detection portion 8 form guide holes 15 through which the shafts 11a to 11d are inserted in the peripheral portion, and slide along the shafts 11a to 11d. A cylindrical rubber 16 is used as the elastic body, a belt 17 is used as the suspension material, the tip of the belt 17 is passed through the notch 13, and the holding means 18 is fixed to the fixing portion 10 by screws, for example.

  The detection switch and other configurations are the same as those in the first embodiment.

  In this invention, the suspension material support device is not limited to the case where the detection unit detects the operation of the detection unit caused by the elastic body elastically deforming due to the overload of the suspension material, and the body to be lifted and affixed to the floor surface. It is also possible to detect this. In other words, the elastic body is elastically deformed when the lifting material suspends the body to be lifted, and the elastic body is restored from the elastic deformation when the body to be lifted is attached to the floor surface. Detect with.

  Moreover, in this invention, the to-be-lifted body may be provided with the winding device 4.

1 is a schematic sectional view of a first embodiment of the present invention. It is a schematic sectional drawing of a suspension material support apparatus. It is a schematic sectional drawing of the operation state. It is a schematic perspective view of the fixing | fixed part and detection part of a suspension material support apparatus. It is a perspective view which shows an example of a specific apparatus. It is a schematic perspective view of the suspension material support apparatus of 2nd Embodiment. It is the side view. It is a schematic perspective view of the suspension material support apparatus of a prior art example.

Explanation of symbols

2 Winding device
3 Lighting equipment 4 Suspension support device 6 Wire
7 Drum 8 Detection Unit 9 Coil Spring 10 Fixing Unit 11 Guide Body 12 Connection Unit 13 Notch 14 Detection Switch 18 Holding Means

Claims (1)

A winding device having a drum that winds and unwinds the base end portion of the suspension material; a suspension material support device that supports a distal end portion of the suspension material and has a detection unit that responds to a load applied to the suspension material; and the suspension device A to-be-lifted body that is suspended by a material and moves up and down by the operation of the winding device , and a detection switch that detects a response operation of the detection unit,
The suspension material support device includes a cylindrical elastic body that is compressible in a cylinder axis direction and through which a distal end portion of the suspension material passes, and a distal end of the suspension material that is supported by the elastic body and passed through the elastic body A fixed portion that holds the portion, and a guide body that guides the fixed portion in its operating direction,
The guide body is a cylindrical body with a bottom, the elastic body is disposed at the bottom of the cylindrical body, the suspension member is passed through the bottom portion, and the suspension member is passed through the elastic body,
The fixed portion and the detection portion are substantially the same shape and face each other in the axial direction of the guide body, and the fixed portion and the detection portion are connected by a connecting portion to form a substantially U-shape in the axial direction of the guide body. The fixed portion has a notch through which the suspension member passed through the elastic body is inserted, and is fixed to the elastic body, and is attached to the tip of the suspension member inserted through the notch. A holding means is provided in the part, the holding means is locked to the notch of the fixing part by the gravity of the elevating body, the detection switch is fixed to the guide body, and the detection part is operated by the operation of the fixing part. A lifting device that operates the detection switch.

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