CN110120640B - Fall protection device, drawer and switchgear - Google Patents

Abstract

The invention provides a falling prevention device, a drawer and a switch device. The drawer of the switchgear has an unlocking button lever at the handle for unlocking the locking of the drawer in the working position so that the drawer can be extracted, the fall arrest device comprising a locking pin movable with the drawer and a position locking member fixedly mounted on a support plate of the drawer, the locking pin being configured to be in an engaged position to be engaged with the position locking member during unlocking of the drawer from the working position to extract the drawer by pressing the unlocking button lever, the locking pin being engaged with the position locking member when the locking pin is moved into alignment with the position locking member with the drawer, the drawer being locked against falling, the unlocking button lever being pressed again, the locking pin being disengageable from engagement with the position locking member, the drawer being able to be pulled out completely.

Description

Fall protection device, drawer and switchgear

Technical Field

The invention relates to a fall protection device for a drawer of a switchgear, to a drawer comprising such a switchgear and to a switchgear comprising such a drawer.

Background

The existing electric drawer cabinets have various structures, but all have basic drawer units, and the drawer units are used for installing main functional devices on drawers, are convenient to replace and maintain, are important components of low-voltage drawer cabinets, and are also one of products which can express product characteristics in domestic and foreign markets. Due to the existence of the primary and secondary plug-in components on the drawer, the drawer needs larger external force in the process of inserting and extracting. There are usually two ways to achieve access, one being a labor-saving propulsion mechanism and one relying entirely on human power, both of which are carried out by the operator in front of the cabinet. In the process of rapid drawing, when the gravity center of the drawer moves to the outside of the cabinet, the drawer can accidentally fall off vertically, thereby causing personnel injury and equipment damage. In fact, similar events have occurred both at the production site and at the use site.

There are several fall protection devices in the prior art, but these devices require an additional separate assembly or an additional action to unlock the drawer after the drawer is locked during the withdrawal defect, which is inconvenient to operate.

Disclosure of Invention

The present invention provides a fall arrest device for a drawer of a switchgear having an unlock button lever at a handle for unlocking locking of the drawer in an operating position so that the drawer can be withdrawn, wherein the fall arrest device comprises a locking pin movable together with the drawer and a position locking member fixedly mounted on a support plate of the drawer, the locking pin being configured to be in an engaged position to be engaged with the position locking member during unlocking of the drawer from the operating position to withdraw the drawer by pressing the unlock button lever, the locking pin being engaged with the position locking member when the locking pin is moved into alignment with the position locking member with the drawer, the drawer being locked against falling, the unlock button lever being pressed again, the locking pin being disengageable from engagement with the position locking member, the drawer can be completely pulled out.

Preferably, the falling prevention device further comprises a push rod, a fixed bracket and an eccentric plate, the fixed bracket is mounted on the bottom plate of the drawer, the eccentric plate is rotatably connected to the fixed bracket through a first rotating pin, the push rod is connected to the eccentric plate through a second rotating pin, the locking pin is connected to the eccentric plate through a third rotating pin, the push rod can be pushed by the unlocking button rod by pressing the unlocking button rod, so that the eccentric plate can rotate.

Preferably, in the working position of the drawer, the unlocking button rod is pressed, the drawer can be separated from the working position to be drawn out, meanwhile, the unlocking button rod is abutted with the push rod, the first end of the push rod is pushed to translate, so that the eccentric plate is caused to rotate along the first direction by taking the first rotating pin as the center, the locking pin is driven to move upwards, after the drawer is drawn out of the working position, the unlocking button rod is separated from the abutment with the push rod, the eccentric plate is caused to abut against the bottom plate of the drawer under the action of gravity, the bottom plate is in a horizontal position, the locking pin penetrates through the opening on the bottom plate to reach the engaging position, and along with the drawing of the drawer, the locking pin is engaged with the retainer, and the drawer is.

Preferably, the unlocking button rod is pressed again, the unlocking button rod abuts against the push rod again, the first end of the push rod is pushed again to translate, and therefore the eccentric plate is caused to rotate in the first direction by taking the first rotating pin as a center, and the locking pin is driven to move upwards to reach the disengaging position, so that the drawer can be completely pulled out.

Preferably, the push rod has a projection which, during withdrawal of the drawer, prior to engagement of the locking pin with the position locking member, contacts a corresponding projection and is lifted upwardly, thereby tilting the first end of the push rod upwardly, forcing the unlocking button lever out of abutment with the push rod without releasing the unlocking button lever after withdrawal of the drawer from the operative position, thereby lowering the locking pin to the engaged position for engagement with the stop member to lock the drawer.

Preferably, the fixing bracket, the eccentric plate, the push rod and the locking pin are formed by sheet metal machining.

Preferably, the first rotation pin, the second rotation pin and the third rotation pin are a bolt, a holed pin, a rivet and a spin rivet pin.

In addition, the invention provides a drawer of a switching device, which comprises the anti-falling device.

The invention also provides a switch device comprising the drawer.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained based on the drawings without creative efforts.

Fig. 1 is a perspective view showing a fall arrest device according to the present invention, with other components omitted for clarity.

Figure 2 is an exploded view of a fall arrest device according to the present invention.

Figure 3 shows a prior art unlocking assembly in a fall arrest device and drawer according to the present invention.

Fig. 4 shows the fall arrest device according to the present invention installed in a drawer.

Fig. 5-10 illustrate the process of withdrawing the drawer.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in the description and claims of the present disclosure are not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.

Fig. 1 shows a perspective view of a fall arrest device 1 according to the present invention, and fig. 2 shows an exploded view of the fall arrest device 1 according to the present invention. The anti-falling device 1 comprises a push rod 2, a fixed bracket 3, an eccentric plate 4 and a locking pin 5. The fixed bracket 3 is fixedly installed on the bottom plate 11 (shown in fig. 4) of the drawer, the eccentric plate 4 is rotatably connected to the fixed bracket 3 by a first rotating pin 61, the second end 22 of the push rod 2 is connected to the eccentric plate 4 by a second rotating pin 62, and the locking pin 5 is connected to the eccentric plate 4 by a third rotating pin 63. An eccentric plate refers to a component whose center of rotation does not coincide with the geometric center. For example, in the present embodiment, the eccentric plate rotates with the first rotating pin 61 as the rotation center, which does not coincide with the geometric center of the eccentric plate. In this embodiment, fixed bolster, eccentric plate, push rod, locking etc. all form through sheet metal working, consequently are convenient for produce and process to the cost is lower. Further, each pivot pin may be a bolt, a holed pin, a rivet, a spin-riveting pin, or the like, but is not limited thereto as long as relative movement of two members connected by the pivot pin can be ensured.

The fall arrest device further comprises a position locking member 7 located on a support plate of the drawer (for supporting the drawer during its extraction), the support plate being stationary during its extraction. During drawer extraction, the locking pin 5 and the position locking member 7 can engage with each other to lock the drawer, thereby preventing the drawer from falling off accidentally.

Figure 3 shows the unlocking assembly in cooperation with the fall arrest device 1. The unlocking assembly is an existing device on the drawer and comprises a handle 8, an unlocking button 9 and an unlocking button rod 10. An unlocking button rod 10 is movably installed on the bottom plate of the drawer, and an unlocking button 9 is installed near the handle, so that an operator can conveniently operate the unlocking button when holding the handle and withdrawing the drawer. In operation, an operator holds the handle and presses the unlocking button 9 to push the unlocking button rod 10 to move; after the unlocking button 9 is released, the unlocking button rod 10 is reset under the action of the spring.

Figure 4 shows the relative position of the fall arrest device, the unlocking assembly, when the fall arrest device according to the present invention is mounted in a drawer, as can be seen.

Hereinafter, a process of drawing out the drawer will be described in detail with reference to fig. 5 to 10.

As shown in fig. 5, when the drawer in the working position is to be pulled out, it is first necessary to unlock the locking of the drawer in the working position. The unlocking button 9 is pressed, the unlocking button rod 10 is pushed, the unlocking button rod 10 unlocks the locking of the drawer in the working position via another component (known in the art and not shown in the figures for unlocking the locking of the drawer in the working position), and then the unlocking button 9 can be released and the drawer can be pulled outwards by holding the handle.

When the drawer is unlocked from the working position, as shown in fig. 6, the unlocking button lever 10 pushes the first end 21 of the push rod 2, which causes the eccentric plate 4 to rotate clockwise about the first rotating pin 61, which causes the locking pin to move upward.

When the unlocking button lever is released after the drawer has been drawn out of the operating position, the unlocking button lever will come out of abutment with the push rod, causing the eccentric plate 4 to abut against the bottom plate of the drawer under the influence of gravity and thus assume a horizontal position, while the locking pin passes through the opening in the bottom plate to the engaged position, as shown in fig. 7.

The drawer is then pulled further outwards and, when the locking pin 5 is aligned with and engages the position locking means 7, the drawer is locked against further withdrawal. Preferably, the locking pin 5 cooperates with a stop on the position locking device 7 to achieve locking of the drawer and thus prevent the drawer from falling, as shown in fig. 8.

With continued reference to fig. 9, when the drawer needs to be completely withdrawn, pressing the unlocking button 9 again pushes the unlocking button rod 10 again, and the unlocking button rod 10 pushes the first end 21 of the push rod 2 again, which again rotates the eccentric plate 4 clockwise about the first rotating pin 61, which drives the locking pin upward, so that the locking pin is disengaged from the position locking device 7, and at this time, the drawer can be pulled outward continuously, so that the drawer is completely withdrawn.

In addition, in actual operation, there is a case where the operator forgets to release the unlock button 9 after unlocking the drawer from the working position, and in such a case, the lock pin cannot be in the engaged position. To prevent this, for example, in the step shown in fig. 10, a projection 23 is provided on the surface of the push rod 2 facing the bottom plate of the drawer, so that, during extraction of the drawer, before the locking pin engages with the position locking member, the projection comes into contact with a corresponding projection and is pushed up upwardly, thereby tilting the first end of the push rod upwardly, forcing the unlocking button lever out of abutment with the push rod, and lowering the locking pin to the engaged position so as to engage with the stopper to lock the drawer. In the present embodiment, the corresponding projection may be located on the position lock device 7, but the present invention is not limited thereto.

The above describes the falling prevention device of the drawer of the switchgear of the present invention. It follows that the fall arrest device of the present invention has the advantage that actuation of the fall arrest device, and hence fall arrest of the drawer, can be achieved without the need for additional components or manual operation, and only the existing unlocking components on the drawer.

Moreover, the technical features disclosed above are not limited to the combinations with other features disclosed, and other combinations between the technical features can be performed by those skilled in the art according to the purpose of the invention, so as to achieve the purpose of the invention.

Claims (9)

1. A fall protection device for a drawer of a switchgear having an unlocking button lever at a handle, the unlocking button rod is used for unlocking the drawer in the working position, so that the drawer can be drawn out, characterized in that the fall protection device comprises a locking pin and a position locking piece, the locking pin can move along with the drawer, and a position locking member fixedly mounted on the support plate of the drawer, said locking pin being configured to be in an engaged position to be engaged with the position locking member during unlocking of the drawer from the operative position to extract the drawer by pressing the unlocking button lever, when the locking pin moves with the drawer into alignment with the position locking member, the locking pin engages the position locking member, the drawer is locked against falling, the unlocking button lever is pressed again, the locking pin can be disengaged from the position locking member, and the drawer can be pulled out completely.

2. The fall arrest device according to claim 1, further comprising a push rod, a fixed bracket mounted to the bottom plate of the drawer, and an eccentric plate rotatably connected to the fixed bracket by a first pivot pin, the push rod being connected to the eccentric plate by a second pivot pin, the locking pin being connected to the eccentric plate by a third pivot pin, the push rod being pushed by the unlocking button lever by pressing the unlocking button lever so that the eccentric plate can rotate.

3. A fall arrest device according to claim 2,

at the operating position of drawer, press the unblock button pole, the drawer can break away from in order to prepare to take out from the operating position, unblock button pole and push rod butt simultaneously, the first end of push rod receives to promote and the translation, thereby it rotates along the first direction to lead to the eccentric plate to use first rotating pin as the center, this drives the stop pin upward movement, loosen the unblock button pole after taking the drawer out the operating position, the unblock button pole can break away from the butt with the push rod, lead to the eccentric plate to lean on with the bottom plate of drawer under the effect of gravity, thereby be in horizontal position, and the stop pin passes the opening that is located on the bottom plate and reaches the engaged position, along with taking out of drawer, the stop pin engages with the retainer, the.

4. A fall arrest device according to claim 3, wherein depressing the unlock button lever again causes the unlock button lever to again abut the push rod, the first end of the push rod again being pushed to translate causing the eccentric plate to rotate in the first direction about the first rotation pin which moves the locking pin upwardly to the disengaged position to enable the drawer to be fully withdrawn.

5. A fall arrest device according to claim 2, wherein the push rod has a projection which contacts a corresponding projection and is lifted upwardly during drawer extraction prior to engagement of the locking pin with the position lock, thereby tilting the first end of the push rod upwardly to forcibly disengage the unlocking button lever from abutment with the push rod without releasing the unlocking button lever after the drawer has been extracted from the operative position, thereby lowering the locking pin to the engaged position for engagement with the stop to lock the drawer.

6. A fall arrest device according to any one of claims 2 to 5, wherein the fixing bracket, the eccentric plate, the push rod and the locking pin are formed by sheet metal working.

7. A fall arrest device according to any one of claims 2 to 5, wherein the first, second and third rotation pins are bolts, apertured pins, rivets and spin-on pins.

8. A drawer of a switchgear comprising a fall arrest device according to any one of the preceding claims.

9. A switchgear comprising a drawer according to claim 8.

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