JP2001080888A - Operating device for electric chain block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operating device for an electric chain block capable of easy operation even from whatever direction of a high/low speed selecting switch changing an up/down moving speed of an up/down winding chain. SOLUTION: A high/low speed selecting switch is constituted by providing a ring-shaped knob 53 mounted so as to turn in an external periphery of a bracket 13 and a switch mechanism selecting a [high speed] and [low speed] in accordance with a turn position of the ring-shaped knob 53. By turning the ring-shaped knob 53 in one direction, the [high speed] and [low speed] of the switch mechanism are alternately switched.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation device for an electric chain block capable of smoothly switching between high speed and low speed.

[0002]

2. Description of the Related Art Conventionally, some electric chain blocks include:
For example, Japanese Patent Application Laid-Open No. 1-69498 filed earlier by the present applicant.
There is one described in Japanese Patent Publication No. That is, the electric chain block shown in FIG.
Is mounted between the chain 81 and the hook 83, and the grip 85 of the operating device 80 is moved up or down from the neutral position to switch the hoisting or lowering operation of the electric chain block. By pressing a high-speed / low-speed switch (push-button switch) 87, the hoisting / lowering speed is switched between high speed and low speed.

[0003] By thus integrally attaching the operating device 80 to a portion such as the chain 81, it is possible for the operator to switch the operation of hoisting and lowering the electric chain block as if lifting and lowering a heavy object.

When an operator on the electric chain block attempts to operate the operating device 80 of the electric chain block, the operating device 80 is operated such that the high-speed / low-speed switch 87 of the operating device 80 faces his or her side. It must be operated by rotating the whole by 180 °.

When the operation device 80 is released after the operation of the high-speed / low-speed switch 87 has been completed, the chain 8
Since 1 is twisted and returns to the original state, the operating device 80 is inverted by 180 ° and returns to the original illustrated state,
When the operator operates the operation device 80 again, the operation device 80 must be turned over again, and the operation is complicated.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to operate a high-speed / low-speed changeover switch without rotating the entire operation device from any direction. An object of the present invention is to provide an electric chain block operating device that can be easily performed.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a tubular body attached between a tip of a winding vertical chain and a load suspending hook, and a tubular body attached to an outer periphery of the tubular body. A grip that moves a predetermined amount in the vertical direction, a high-speed low-speed switch installed on a bracket provided at the end of the cylindrical body, and a vertical or reverse rotation of the winding vertical motor by moving the grip in the vertical direction. An electric chain block comprising a control device for switching the load suspending hook up and down and moving the hoisting up and down motor up and down to high or low speed by switching the high speed and low speed switch to "high speed" or "low speed". The operating device according to claim 1, wherein the high-speed / low-speed switching switch includes a ring-shaped knob mounted to rotate around the outer periphery of the bracket, and a rotation position of the ring-shaped knob. Characterized in that it is configured by including a switch mechanism for switching the "slow" and "fast" in accordance with the. The high-speed / low-speed switch is characterized in that the ring-shaped knob is rotated in one direction to alternately switch between "high speed" and "low speed" of the switch mechanism. And

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a view showing a main part of an operating device for an electric chain block according to the present invention.
1A is a sectional view of a main part, FIG. 1B is a front view, and FIG.
1A is a sectional view taken along the line AA in FIG. 1A, and FIG.
It is a BB sectional arrow view of (a).

In FIG. 1, reference numeral 11 denotes a cylindrical tubular body, and a cylindrical grip 12 slidable up and down by a predetermined amount is attached to the outer periphery of the tubular body 11. Although not shown, two limit switches 19 and 20 are provided inside the cylinder 11.
(See FIG. 3), and the grip 12 is raised from the neutral position shown in FIG. 1B (the grip 12 is automatically returned to the neutral position when there is no load by a not-shown resilient means). In the direction of the limit switch 1
When the switch 9 is turned on and moves downward from the neutral position, the other limit switch 20 is turned on.

[0010] A lower bracket 13-
2 is fixed, and an upper bracket 13-1 is fixed above the lower bracket 13-2 with a ring-shaped knob 53 constituting a high-speed / low-speed switch. The fixing between the upper bracket 13-1 and the lower bracket 13-2 is performed by the support projection 5 protruding from the lower bracket 13-2 side.
1 is being done.

The ring-shaped knob 53 is substantially disk-shaped, and has a hole 5 at its center, which is rotatably supported by the support projection 51.
4 are provided, and a cylindrical projection 55 is provided on the upper surface thereof, eight concave portions 58 are provided on the outer periphery thereof at equal intervals, and four projection-like pressing portions 5 are provided on the lower surface of the ring-shaped knob 53 at equal intervals.
6 is provided. Eight small protrusions 57 are provided at equal intervals on the outer periphery of the ring-shaped knob 53.

On the other hand, one micro switch 59 is mounted on the bottom surface of the lower bracket 13-2, and its lever portion 50 is located at a position where it comes into contact with the pressing portion 56. The ring-shaped knob 53 and the microswitch 59 constitute a high-speed low-speed switch.

A single concave portion 62 is provided on the inner peripheral surface of the lower portion of the upper bracket 13-1, and the ball 63 is moved by the coil spring 61 housed in the concave portion 62 into the concave portion 58.
The ring-shaped knob 53 is clicked when the ring-shaped knob 53 is rotated.

When the ring-shaped knob 53 is turned,
It stops at the position where the ball 63 engages with the concave portion 58,
8 are provided at equal intervals and four pressing portions 56 are provided at equal intervals, so that each time the ball 63 engages with the concave portion 58, even if the ring-shaped knob 53 is rotated in either the left or right direction. Then, the state where the pressing portion 56 presses the lever portion 50 of the microswitch 59 and the state where the pressing portion 56 does not press the lever portion 50 are alternately repeated.

In other words, according to this operating device, high speed and low speed can be switched simply by turning the ring-shaped knob 53 left and right, regardless of the direction of the entire circumference of the operating device. Since the operation can be performed in any direction, the operation does not become complicated.

Next, on the side surface of the upper bracket 13-1,
Speed adjustment knob 1 that adjusts speed continuously in a high speed range
5 and a speed adjusting knob 16 for continuously adjusting the speed in a low speed range. A flange 27 is provided on the outer periphery of the upper bracket 13-1, and a pair of protrusions 28 are provided on the upper surface.
The lower end of the winding vertical chain 31 described later is inserted into the gap 28, and a pin is inserted through the pin hole 29 to fix the operating device to the lower end of the winding vertical chain 31.

Variable resistors are linked to the speed adjusting knob 15 and the speed adjusting knob 16 so that the speed can be adjusted steplessly in a high speed range and a low speed range, respectively.

FIG. 2 is a view showing the entire configuration of an electric chain block provided with the above-mentioned operating device. As shown in FIG. The lower end of the winding vertical chain 31 is fixed to the protrusions 28, 28 (see FIG. 1) as described above. Reference numeral 33 denotes a drive unit having a DC motor or the like, and reference numeral 34 denotes a block suspension hook for suspending the electric chain block.

FIG. 3 is a control circuit diagram of the electric chain block according to the present invention. In the figure, 41 is an operation circuit,
42 is a phase control circuit, 43 is a full-wave rectifier circuit, 44 is a forward / reverse rotation circuit, DBR is a dynamic brake resistor, and 45 is a DC motor (winding up / down motor).

The operation circuit 41 includes a hoisting circuit 41a, a hoisting circuit 41b, a microswitch 59, a high-speed variable speed variable resistor VRH, and a low-speed variable speed variable resistor VRL.

The hoisting circuit 41a includes a contact of a limit switch 19 for detecting hoisting and a normally closed contact MD-1 of a hoisting relay.
And a hoisting relay MU in series.
"b" is a series circuit of a contact of the limit switch 20 for detecting the winding-down, a normally closed contact MU-1 of the winding-up relay, and a winding-down relay MD. The high-speed speed adjusting variable resistor VRH and the low-speed speed adjusting variable resistor VRL are connected in parallel, and are switched by a microswitch 59.
The high-speed speed adjusting variable resistor VRH is a variable resistor for continuously controlling the speed in a high-speed range, and its resistance value changes by rotation of the speed adjusting knob 15. The low-speed speed adjusting variable resistor VRL is a variable resistor for controlling the speed in the low-speed range in a stepless manner, and the resistance value changes by the rotation of the speed adjusting knob 16.

The phase control circuit 42 includes a capacitor C, a trigger element D such as a bidirectional trigger diode SBC (silicon bilateral switch), and a triac T.

The forward / reverse rotation circuit 44 includes normally open contacts MU-2 and MU-3 of the hoisting relay MU and normally open contacts MD-2 and MD-3 of the hoisting relay MD. The dynamic brake resistor DBR has a normally closed contact MU-4 of the hoisting relay MU and a normally closed contact MD- of the hoisting relay MD.
4 are connected in series.

In the operating device provided with the control circuit having the above-described configuration, the ring-shaped knob 53 (see FIG. 1) is rotated so that the pressing portion 56 presses the lever portion 50 of the microswitch 59 and the non-pressed state. , Micro switch 5
The contact No. 9 is closed to the H side or the L side, and the high-speed speed adjusting variable resistor VRH or the low-speed speed adjusting variable resistor VRL is connected.

When the grip 12 is moved upward in this state, the contact of the limit switch 19 is closed, and the hoisting relay M is switched from the AC power supply AC through the contact 19 and the normally closed contact MD-1.
An operating current flows through U, and the hoisting relay MU operates to close the normally open contacts MU-2 and MU-3 and open the normally open contacts MU-1 and MU-4. This allows the AC power source A
The alternating current from C is phase-controlled by the phase control circuit 42, full-wave rectified by the full-wave rectification circuit 43, and supplied to the DC motor 45, whereby the DC motor 45 rotates forward. At this time, the amount of power supplied to the DC motor 45 is controlled by the resistance value of the high-speed variable resistor VRH or the low-speed variable resistor VRL depending on whether the microswitch 59 is on the high speed side or the low speed side. And the rotation speed is adjusted.

In the above-described embodiment, the high-speed / low-speed switch is configured so that the ring-shaped knob 53 can be rotated in either direction to switch between high-speed and low-speed alternately. You may comprise so that only a right direction or a left direction can be rotated.

Further, the ring-shaped knob 53 is configured to be rotatable only from the neutral position to the left and right by a predetermined angle, so that the rotation speed becomes high when rotated to the right by a predetermined angle and becomes low when rotated to the left by a predetermined angle. Alternatively, a high-speed low-speed switch may be configured. Thus, the ring-shaped knob 5
Even if the switching operation method for the high-speed and low-speed switching operations is different, there is no problem since the ring-shaped knob 53 can be operated from any direction of 360 °. In the above-described embodiment, the microswitch 59 having the mechanical contact is used as the switch mechanism operated by the ring-shaped knob 53 of the high-speed / low-speed changeover switch. However, a non-contact contact that is turned on and off using light or magnetism is provided. Other various switch mechanisms such as a switch mechanism may be used.

In the above embodiment, the bracket 13 (1
Although 3-1 and 13-2) are provided on the upper part of the cylindrical body 11, it goes without saying that the bracket 13 may be provided on the lower part of the cylindrical body 11. Needless to say, the control circuit constituting the control device can be variously changed, and may be controlled by microcomputer control.

[0029]

As described above in detail, according to the present invention, the operation of the high-speed / low-speed switch can be performed from any direction without rotating the entire operation device, and the operation is facilitated. Has an effect.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main part of an operating device for an electric chain block according to the present invention, and FIG.
1B is a front view, FIG. 1C is a sectional view taken along the line AA of FIG. 1A, and FIG. 1D is a sectional view taken along the line BB of FIG.

FIG. 2 is an overall configuration diagram of an electric chain block including an operation device.

FIG. 3 is a control circuit diagram of the electric chain block.

FIG. 4 is an overall configuration diagram of a conventional electric chain block.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Cylindrical body 12 Grip 13 Bracket 13-1 Upper bracket 13-2 Lower bracket 19, 20 Limit switch 31 Chain for winding up / down 32 Hook for load suspension 33 Drive unit 34 Hook for block suspension 45 DC motor (winding up / down motor) Reference Signs List 50 lever section (switch mechanism) 53 ring-shaped knob 56 pressing section (switch mechanism) 58 concave section 59 microswitch (switch mechanism) 61 coil spring 62 concave section 63 ball

Claims (2)

[Claims] 1. A tubular body attached between a tip of a winding vertical chain and a load suspending hook, a grip attached to an outer periphery of the tubular body and moving a predetermined amount in a vertical direction, and an end of the tubular body. A high-speed low-speed switch provided on a bracket provided in the section, and a vertical movement of the grip to switch the winding vertical motor to forward or reverse to move the load suspension hook up and down, and An operation device for an electric chain block comprising a control device for switching the vertical movement of the winding up / down motor to high speed or low speed by switching the low speed switch to "high speed" or "low speed", wherein the high speed / low speed switch is the bracket. A ring-shaped knob mounted to rotate around the outer periphery of the switch, and a switch device for switching between "high speed" and "low speed" according to the rotation position of the ring-shaped knob Operating device for an electric chain block, characterized in that it is configured by including and. 2. The high-speed / low-speed switching switch is configured such that a high-speed and a low-speed switching mechanism is alternately switched by rotating a ring-shaped knob in one direction. The operating device for an electric chain block according to claim 1, wherein