JPH072385U - Tensioning connection mechanism between chain and lifting frame - Google Patents

Abstract

(57) [Abstract] [Purpose] A connection that connects an elevating frame that is lowered by the delivery of a chain and is positioned by engaging with a fixed positioning member to the chain, and that can give tension to the chain that is delivered to some extent. Provision of mechanism. [Structure] The coupling mechanism 20 is incorporated between the lower end of the chain 29 and the hanger 23, and has a pin 41 suspended at the lower end of the chain, a spring 43 provided at the lower end of the pin 41, and a vertical movement. A pin 41 is movably mounted on the hanger 2 and is urged upward by a spring 43.
3 has a hanger receiver 44, a stopper 45 fixed to the pin 41 and receiving the hanger receiver 44, and a second spring 46 interposed between the hanger receiver 44 and the hanger 23 and having a weaker elasticity than the weight of the hanger 23. ing. When the chain is slightly fed out after the descent of the hanger is regulated, the second spring 46 pushes down the pin to apply tension to the chain and prevent the chain from loosening.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention connects a chain to an elevating frame that is lowered by the feeding of the chain and is positioned by engaging with a fixed positioning member, and can also give a tension to the slightly fed chain. Regarding

[0002]

[Prior art]

 Conventionally, an elevating frame for holding a work, a conveyed product, etc. is suspended by a chain, for example, on a carrier (not shown). This elevating frame is adapted to be positioned at a predetermined position by being engaged with a fixed positioning member (not shown) when it is raised and lowered by feeding and winding the chain and lowered.

Further, the lifting frame is hung at the lower end of the chain by a connecting mechanism having a cushioning function that absorbs an impact force applied downward while the elevator frame is being raised and lowered. As shown in FIG. 5, this connecting mechanism has a structure in which a lifting frame 14 is vertically movably supported by a pin 12 suspended at the lower end of a chain 11 via a spring 13.

Further, the chain 11 is sent out to some extent even after the elevating frame 14 is engaged with the positioning member and its lowering is regulated so that the elevating frame 14 is securely engaged with the positioning member. Has become. At this time, the pin 12 descends in the hole 15 of the elevating frame 14 by its own weight. When the pin 12 descends to some extent, the striker 16 formed on the upper end of the pin 12 actuates a microswitch (not shown) to stop the delivery of the chain 11. Therefore, after the elevating frame 14 is engaged with the positioning member and its lowering is restricted, the chain 11 is stretched by the weight of the pin 12 without receiving the load of the elevating frame 14.

[0005]

[Problems to be solved by the device]

 However, in such a connecting mechanism 10, after the elevating frame 14 is restricted from descending by being engaged with the positioning member, the load of the elevating frame 14 is not applied to the chain 11 and the pin 12 that is lighter than the elevating frame 14 is not applied. It is designed to add its own weight. Therefore, there is a problem in that the chain 11 may be loosened and twisted, which may interfere with the subsequent winding operation of the chain 11.

[0006]

[Means for Solving the Problems]

 The present invention relates to a connecting mechanism in which an elevating frame, which descends when a chain is fed out and is engaged with a fixed positioning member to be positioned, is vertically movably suspended via a spring on a pin suspended at the lower end of the chain. At the pin, which is vertically movably provided to the pin and is urged upward by the spring to receive the elevating frame, and is fixed to the pin to receive the elevating frame receiver above the elevating frame receiver. The above problem is solved by the tension applying connection mechanism having a stopper and a second spring having a weaker elasticity than the weight of the elevating frame, which is interposed between the elevating frame receiver or the stopper and the elevating frame.

[0007]

[Action]

 Usually, the lifting frame receiver is pushed up by a spring and pressed against a stopper, and the lifting frame receives the lifting frame by the elastic force of the spring. At this time, the second spring is compressed by the weight of the lifting frame. The chain is sent out to some extent even after the elevating frame is engaged with the positioning member to be positioned and the descending is restricted. The pin descends by its own weight as much as the chain is fed out. At the same time, the second spring is released from the compressed state, extends between the lifting frame and the lifting frame receiver, and pushes down the pin via the lifting frame receiver and the spring. This forces the chain to be tensioned and prevented from loosening.

[0008]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. First, a hanger suspension device 21 in which a tension applying connecting mechanism (hereinafter, simply referred to as a "connecting mechanism") 20 (see FIG. 3) for a chain and a lifting frame is incorporated will be described. The hanger suspension device 21 is a device for suspending a hanger (elevating frame) 23 on a carrier 22. The carrier 22 is a well-known transport vehicle, and travels on rails 24 suspended from the ceiling in the front-back direction of the paper surface of FIG. 3 by traveling wheels 25 and guide rollers 26, 26. The carrier 22 is provided with a tilting frame 28 which is tiltable about a pin 27.

A hanger 23 is suspended from the tilting frame 28 by a hanger suspension device 21. The hanger suspension device 21 has chains 29, 29 that are sent out and wound up by a motor (not shown). A hanger 23 is suspended from the lower end of the chain 29 by the connecting mechanism 20.

As shown in FIG. 1, the connecting mechanism 20 includes a pin 41, a first spring receiver 42, a first spring (spring) 43, a hanger receiver (elevating frame receiver) 44, a stopper 45, a second spring 46, etc. It is composed of.

The pin 41 is a screw shaft suspended at the lower end of the chain 29. Nuts 47, 47 are screwed into the lower end of the pin 41. On the upper side of the nut 47, a first spring receiver 42 that receives the first spring 43 by a collar 48 is loosely fitted to the pin 41 so as to be vertically movable. The first spring receiver 42 may be screwed into the pin 41 by omitting the nut 47. Alternatively, the nut 47 may be used instead of the first spring receiver 42.

A first spring 43 having elasticity that can support the hanger 23 is provided above the first spring receiver 42. On the upper side of the first spring 43, a hanger receiver 44 biased upward by the first spring 43 is loosely fitted to the pin 41 so as to be vertically movable. The hanger receiver 44 is formed in a cup shape and receives the hanger 23 by the elasticity of the first spring 43.

Stoppers 45, 45 are screwed onto the pins 41 on the upper side of the hanger receiver 44. The stopper 45 is a nut. Further, a second spring 46, which is less elastic than the weight of the hanger 23, is provided between the hanger receiver 44 and the hanger 23. The second spring 46 may be provided between the stopper 45 and the hanger 23. A striker 50 that contacts a micro switch (not shown) and detects the lowered position of the chain 29 is screwed into the upper end of the pin 41.

Next, the operation will be described. Normally, the hanger receiver 44 is pushed up by the first spring 43 and pressed against the stopper 45, as shown in FIG. 1, and receives the hanger 23 by the elasticity of the first spring 43. At this time, the second spring 46 is compressed by the weight of the hanger 23.

Even if the hanger 23 descends and engages with the fixed pin-shaped positioning member 51 (see FIG. 3) to be positioned and the descending is regulated, the chain 29 is slightly moved to ensure this engagement. Sent out. As shown in FIG. 2, the second spring 46 is released from the compressed state and extends between the hanger 23 and the hanger receiver 44. The second spring 46 extends through the hanger receiver 44, the first spring 43, and the nuts 47, 47. Press down and force tension on chain 29. This prevents the chain 29 from loosening. Since the elastic force of the first spring 43 is stronger than the elastic force of the second spring 46, the hanger receiver 44 moves downward together with the pin 41 while being pressed against the stopper 45.

When a downward impact force is applied to the hanger 23 for some reason while the hanger 23 is being lifted (for example, when the hanger 23 is suddenly raised), the hanger 23 is attached to the first spring 43. Against it, it descends with the hanger receiver 44. This buffers the impact force.

[0017]

[Effect of device]

 According to the tensioning connection mechanism of the present invention, even if the descent of the hanger is restricted, the tension is forcibly applied to the chain by the second spring, so that the chain can be prevented from loosening and twisting. This has the effect of eliminating the possibility of hindering the subsequent winding operation of the chain.

[Brief description of drawings]

FIG. 1 is a front view of a tensioning connection mechanism of the present invention, which is a sectional view taken along a pin.

FIG. 2 is a front view of an operating state of the tension applying connection mechanism.

3 is a front view of a hanger suspension device incorporating the tensioning connection mechanism of FIG. 1. FIG.

FIG. 4 is a front view of a portion where the hanger is suspended by the tension applying connection mechanism of FIG.

FIG. 5 is a front view of a conventional coupling mechanism, which is a cross-sectional view taken along a pin.

[Explanation of symbols]

 20 Tensioning and connecting mechanism 23 Hanger (elevating frame) 29 Chain 41 Pin 43 First spring (spring) 44 Hanger receiver (elevating frame receiver) 45 Stopper 46 Second spring 51 Positioning member

Claims (1)

[Scope of utility model registration request] 1. A connecting mechanism in which an elevating frame, which is lowered by feeding a chain and is engaged with a fixed positioning member to be positioned, is vertically movably suspended via a spring on a pin suspended at the lower end of the chain. At
An elevating frame receiver that is vertically movably provided on the pin and is urged upward by the spring to receive the elevating frame; and a stopper that is fixed to the pin and receives the elevating frame receiver above the elevating frame receiver, A tensioning and connecting mechanism for a chain and an elevating frame, comprising a second spring which is interposed between the elevating frame receiver or the stopper and the elevating frame and has a weaker elastic force than the weight of the elevating frame.