JP3379335B2 - Hoist equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hoist device and is suitably used for an electric lift for nursing care. 2. Description of the Related Art FIGS. 4 and 5 show a main part of an electric lift using a hoist device. As shown in the figure, a drum 2 attached to a rotating shaft 1 is provided rotatable clockwise or counterclockwise by a driving force of a motor. Drum 2
, One end of the belt sling 3 is connected and the belt sling 3 is wound, and the other end is hung down between a pair of rollers 4 for enabling slant suspension.
At the other end of the belt sling 3 is attached a suspender 5 for suspending the care receiver. In such an electric lift, detection plates 6a and 6b are sewn at two places near the one end and the other end of the belt sling 3, respectively, in order to limit the range of the lifting and lowering operation of the hanging member 5, A proximity sensor 7 for detecting the presence of the plates 6a, 6b is provided. In addition, the belt sling 3 is folded back at the portion of the hanging member 5 so as to be doubled at the detection plate 6b. In addition, since both the upper limit and the lower limit of the belt sling 3 are detected only by the single proximity sensor 7, a latching relay (not shown) for determining whether the belt sling 3 is moving up or down is provided. Is provided. Next, the operation of the electric lift will be described. When the latching relay detects that the belt sling 3 is descending and the proximity sensor 7 detects the detecting plate 6a, the drum 2 is restrained by a brake (not shown) so that the belt sling 3 does not descend any further. Conversely, when the latching relay detects that the belt sling is being raised and the proximity sensor 7 detects the detection plate 6b, the drum 2 is restrained by the brake so that the belt sling 3 is not further raised. However, when a power failure occurs after the belt sling 3 is raised, the brake is manually released, and the belt is moved to the lower limit detection position where the proximity sensor 7 detects the detection plate 6a. When the sling 3 is lowered, the detection plate 6a for detecting the lower limit is changed to the detection plate 6b for detecting the upper limit because the latching relay is determined to be rising before the power failure.
Therefore, the drum 2 is restrained by the brake and the belt sling 3 cannot be lifted after the power is restored. When the surrounding temperature rises after the belt sling 3 is left slightly lowered from the upper limit detection position, the belt sling 3 contracts and the detection plate 6b rises to be detected by the proximity sensor 7, and the latching relay is activated. Since it is determined that the lowering member 6 is being lowered, the hanging member 5 cannot be lowered because the detecting plate 6b for detecting the upper limit is determined to be the detecting plate 6a for detecting the lower limit. Further, the distance between the detection plates 6a and 6b and the proximity sensor 7 differs between the upper limit detection and the lower limit detection of the belt sling 3 because the amount of the belt sling 3 wound around the drum 2 is different. Fine adjustment is required when the proximity sensor 7 is attached, and the number of man-hours for assembling the hoist device increases. Further, if the belt sling 3 is lowered in a slack state, the belt sling 3 is not smoothly fed out, and a reverse winding may be started to damage the hanging member 5. [0009] Therefore, an object of the present invention is to provide a hoist device that solves such a problem. According to a first aspect of the present invention for achieving the above object, a member to be detected is provided on the opposite side of the cable member from the drum and a proximity sensor is provided. while the upper limit detecting means rope member, near the drum der
And the feeding of the cable member from the drum is almost completed.
A switch is provided near the rope member in the retracted state, and when the tension of the rope member is low and when the rope member is unwound from the drum.
When the cable is almost finished and the cable member approaches the switch
Is the lever that will press the switch by the biasing means.
And a means for detecting the lower limit of the cable member .
You. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on an embodiment shown in the drawings. In this embodiment, since a part of the conventional electric lift is improved, the same parts as those in the related art are denoted by the same reference numerals, and the description thereof will be omitted. (A) Embodiment 1 FIG. 1 shows the configuration of an electric lift as a hoist device according to the present invention. As shown in the figure, a micro switch 8 is provided near the drum 2 for detecting a lower limit of the belt sling 3 as a rope member, and a micro switch is provided on one of the pair of rollers 4 via the hanging belt sling 3. 8 is provided with a torsion coil spring 9 for pushing the lever 8a. As shown in FIG. 1A, the torsion coil spring 9 has a substantially U-shape, and both ends are spirally attached to both ends of one of the rollers 4, and the torsion coil spring 9 extends the belt sling 3 over its entire width. To the lever 8a. In addition, a proximity sensor 7 is provided for detecting the upper limit of the belt sling 3 as in the prior art, and a detection plate 6b as a member to be detected is sewn at the lower end of the belt sling 3. The detection plate is not sewn on the upper end of the belt sling 3. Also, the proximity sensor 7
Performs only detection of the upper limit of the belt sling 3, and therefore does not include a latch relay. Next, the operation of the electric lift will be described. When the weight of the hanging member 5 is no longer added to the belt sling 3 due to the lowering of the belt sling 3, the belt sling 3 is slackened. 8a is pushed, the brake is applied, and the rotation of the drum 2 stops. Also, when the number of turns of the belt sling 3 around the drum 2 is reduced, the lever 8a is pressed similarly as shown as the belt sling 3b. In other cases, no slack occurs in the belt sling 3, so that the biasing force of the torsion coil spring 9 is supported by the belt sling 3 and the lever 8a is not pressed. When the belt sling 3 rises above the upper limit detection position, the proximity sensor 7 operates the detection plate 6b as in the prior art.
Is detected and the drum 2 is braked. (B) Second Embodiment Next, a second embodiment of the electric lift will be described with reference to FIG. This embodiment is different from the first embodiment in that the torsion coil spring 9 is used.
And the following configuration. As shown in the figure, the base end portions of the pair of lever pieces 10 are rotatably supported by one end of one of the pair of rollers 4, and the front end portions thereof are connected pins 1
1 and the connection plate 12. On the other hand, a micro switch 13 having a push button 13 a is provided near the drum 2, and a spring as a biasing means is provided between a spring hook 14 provided on the micro switch 13 and a spring hook 15 formed on the connecting plate 12. A coil spring 16 is provided. The belt sling 3 is suspended by being inserted between the connecting pin 11 and the connecting plate 12. The push button 13a of the microswitch 13 is directly pressed by the connecting plate 12 without the intervention of the belt sling as in the first embodiment. Other configurations and operations are the same as those in the first embodiment, and thus description thereof is omitted. (C) Third Embodiment Finally, FIG. 3 shows a third embodiment of the electric lift. The detection means for detecting the lower limit of the belt sling 3 is configured as follows. A base end of a pair of lever pieces 17 is rotatably supported at one end of one of the pair of rollers 4, and a rotatable roller 1 is provided at a tip between the pair of lever pieces 17 and in the vicinity thereof.
8 and a spring hook 19 are provided. A pressing portion 20 is formed on the side of the lever piece 17. And
Belt sling 3 in which roller 18 is wound around drum 2
A coil spring 21 for urging upward is provided between the spring hook 19 and the fixed portion. On the other hand, a microswitch 22 is mounted at a position where the pressing portion 20 presses when the belt sling 3 wound around the drum 2 is fed out and becomes small. The micro switch 22 is provided with a lever 22a, and the lever 22a and the pressing portion 20 face each other. In addition, a proximity sensor 7 is provided for detecting the upper limit of the belt sling 3 as in the prior art, and a detection plate 6b as a member to be detected is sewn at the lower end of the belt sling 3. The detection plate is not sewn on the upper end of the belt sling 3. Also, the proximity sensor 7
Performs only detection of the upper limit of the belt sling 3, and therefore does not include a latch relay. Next, the operation of the electric lift will be described. When the amount of the belt sling 3 wound around the drum 2 is large, since the distance between the axis of the rotating shaft 1 and the axis of the roller 18 is large, the pressing portion 20 does not press the lever 22a. However, when the belt sling 3 descends and the amount of the belt sling 3 wound around the drum 2 decreases, the pressing portion 20 pushes the lever 22a. Therefore, the rotation of the drum 2 is stopped by the action of the brake, and the belt sling 3 does not descend any further. The other configuration and operation are the same as those of the first embodiment, and the description is omitted. In the first to third embodiments, the case where the hoist device is applied to the electric lift for nursing care has been described. However, it is needless to say that the hoist device may be applied to the hoist device for moving and lifting the work. Therefore, the hanging tool may be not for hanging the care receiver but for hanging the work. As can be seen from the above description, claim 1
According to the hoist device, the upper limit detection and the lower limit detection of the rope member are separately detected by the proximity sensor and the switch, so at the time of the power failure after the ascent operation, the brake is manually released and the rope member is moved to the lower limit detection position. When the cable member is lowered, the cable member cannot be raised as in the related art, and when the cable member naturally contracts at a position slightly lowered from the upper limit detection position, the cable member cannot be lowered. . Also, since the proximity sensor does not need to detect the lower limit, the allowable range is widened and fine adjustment is not required.On the other hand, the switch does not need to detect minute displacement, so no adjustment is required, and the man-hour for hoist device is reduced. it can. In addition, the cord member can be extended from the drum.
When it is almost finished, the cable member approaches the switch and slides.
The switch is easily pushed, the switch is pushed by the lever, the drum is braked, and the descent of the rope member is stopped, so that the reverse winding of the rope member around the drum is prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a left side view and FIG. 1 (b) is a front view of a main part of an electric lift as a first embodiment of a hoist apparatus according to the present invention. 2 (a) is a left side view and FIG. 2 (b) is a front view of a main part of an electric lift as a second embodiment of the hoist apparatus according to the present invention. 3 (a) is a front view, and FIG. 3 (b) is a view of the hoist device according to the third embodiment of the present invention, as viewed in the direction of arrows AA in FIG. 3 (a). FIG. 4 is a front view showing a main part of a conventional electric lift. FIG. 5 is a left side view showing a main part of a conventional electric lift. [Description of References] 2 ... drum 3 ... belt sling 5 ... hanging tool 6b ... detection plate 7 ... proximity sensor 8, 13, 22 ... micro switch 9 ... torsion coil spring 10, 17 ... lever piece 11 ... connection rod 12 ... connection plate 16, 21 ... coil spring 18 ... roller

Claims (1)

(57) [Claims 1] A motor is interlocked to a rotatable drum, and one end of the cable member is wound around the drum, while a hanging member is attached to the other end of the cable member. The detected member is attached near the other end of the cable member and a proximity sensor for detecting the detected member is provided near the drum, while the proximity of the cable member near the drum and from the drum is repeated.
Ri put the switch <br/> provided in the vicinity of the rope member in a state of being substantially completed, provided rotatable lever so as to sandwich the rope member between the switch, towards the distal end of the lever to the switch by providing a biasing means for biasing Te, when the rope member had not a close to the switch ends repeatedly out <br/> Shiga unillustrated rope member from when slack is rope member and the drum Is
A hoist device characterized in that the switch is pushed by the tip of the lever.