KR20080093496A - Door latch for heavy equipment - Google Patents

Abstract

A door latch for heavy equipment is provided to be prevented from being arbitrarily released due to vibration and shock under inferior work conditions. A door latch for heavy equipment includes a striker, a body(23), a latch member(25), a handle(27), and an elastic member. The striker is mounted on a door frame. The body is mounted in a recessed space of a door. The latch member is fixed to one end of a fixed axis(24) and locked or released to or from the striker. The handle is foldably connected to the other end of the fixed axis. A key assembly(26) is installed in the handle. The elastic member elastically supports the fixed axis in a closing direction of the door.

Description

Door latch for heavy equipment

1 is a schematic view of a heavy equipment equipped with a door lock according to the prior art,

Figure 2 is a perspective view of a door lock device for heavy equipment according to an embodiment of the present invention,

Figure 3 is a cross-sectional view of the door lock device for heavy equipment according to an embodiment of the present invention,

4 is a view showing a locked state of the door lock according to an embodiment of the present invention,

5 is a view showing the unlocking state of the door lock according to an embodiment of the present invention,

6 is a state diagram using the locking device shown in FIG.

7 is a state diagram used in the locking device shown in FIG.

* Explanation of symbols used in the main part of the drawing

20; Door frame

21; Striker

22; door

23; Body

24; Fixed shaft

25; Latch member

26; Key assembly

27; handle

28; Elastic member

29; nut

30; spring washer

31; Push pin

The present invention relates to a door lock device for heavy equipment that locks a variety of doors (such as side doors, engine hood doors, toolbox doors) that are mounted to be opened and closed to the door frame of the heavy equipment.

More specifically, the door lock is made to be durable in accordance with the enlargement of the equipment and the requirements of the user, so that the locking and unlocking of the lock can be prevented even in a harsh working environment (vibration and shock are generated during operation due to the characteristics of the equipment). It relates to a door lock device for heavy equipment that can be operated smoothly.

As shown in Figure 1, the heavy equipment equipped with a door lock according to the prior art, the tracked or wheel type lower running body (1),

An upper swinging body 2 rotatably mounted on the lower running body 1,

An cab 3 and an engine compartment 4 mounted on the upper swing structure 2,

A bucket mounted to the upper swinging structure 2 and driven by a boom 6 driven by the boom cylinder 5 and an arm 8 driven by the arm cylinder 7 and a bucket cylinder 9 A work device 11 including 10),

A side door 12 mounted to be opened and closed about a hinge shaft fixed to the door frame of the engine compartment 4,

A case 13 accommodated inside the side door 12, a handle 14 installed in the case 13 to open and close the side door, and a handle 14 installed on the handle 14 and coupled with a key to rotate. It includes a locking device 16 consisting of a key portion 15 for opening the side door 12 in accordance with the rotation in the unlocking direction.

Prior art locking device 16 is not designed and manufactured to have sufficient durability against shock and vibration generated in equipment mainly working in a harsh working environment, so the corresponding parts of the locking device are easily deformed or broken.

In addition, the corresponding parts constituting the locking device are easily corroded by the external environment (climate, temperature, etc.) conditions, so that locking and unlocking operations of the locking device 16 are not smooth, and corresponding parts forming the locking device 16 ( Frequent replacement of the spring, etc.), the user's dissatisfaction and equipment reliability is low.

In addition, when the locking of the locking device 16 is released randomly due to the vibration generated from the equipment during operation or the impact from the outside, there is a problem that causes the risk of theft accident such as a hydraulic pump installed inside the side door 12. Have

Embodiment of the present invention, the door lock is formed to be durable against vibration, shock, etc. generated during the operation, to prevent the corrosion of the corresponding parts constituting the locking device can be smoothly operated locking and unlocking. Associated with a heavy duty door lock.

Embodiment of the present invention relates to a heavy-duty door lock device that can prevent the locking of the door lock device to be randomly released by the vibration, shock, etc. generated in the equipment when working in an environment with poor working conditions.

In the door lock device for heavy equipment according to an embodiment of the present invention, the door lock device is mounted to be opened and closed to the door frame of the heavy equipment,

A striker mounted on the door frame,

A body mounted on the space recessed into the door,

A latch member fixed to one end of a fixed shaft rotatably coupled to the body and locked and unlocked to the striker;

A handle that is foldably connected to the other end of the fixed shaft and has a key bundle installed thereon;

It includes an elastic member for elastically supporting the fixed shaft in the direction in which the door is closed.

According to a preferred embodiment, at least one of the body, the handle, the elastic member, the fixing pin for connecting the handle to the fixed shaft is formed of a stainless material to have corrosion resistance.

It further comprises a spring washer coupled to the above-mentioned fixed shaft to prevent loosening of the nut supporting the latch member.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are intended to describe in detail enough to enable those skilled in the art to easily practice the invention, and therefore It does not mean that the technical spirit and scope of the present invention is limited.

As shown in Figure 2 to 7, the door lock device for heavy equipment according to an embodiment of the present invention, in the door lock device is mounted to be opened and closed on the door frame of the heavy equipment,

Striker 21 mounted on the door frame 20,

A body 23 mounted to a space portion recessed into the door 22,

A latch member 25 fixed to one end of the fixed shaft 24 rotatably coupled to the body 23 and locked and unlocked to the striker 21;

A handle 27 foldably connected to the other end of the fixed shaft 24 and having a key bundle 26 installed thereon;

An elastic member 28 (compression coil spring) for elastically supporting the fixed shaft 24 in the body 23 in the direction in which the door 22 is closed,

It includes a spring washer 30 is screwed to the fixed shaft 24 to prevent the loosening of the nut 29 for supporting the latch member (25).

Since the nut 29 is elastically supported in the direction in which the nut 29 is fastened by the spring washer 30 described above, the nut 29 is prevented from loosening even when vibration, shock, or the like is applied to the door locking device from the outside. .

At least one of the above-described body 22, the handle 27, the elastic member 28, the fixing pin 31 for connecting the handle 27 to the fixed shaft 24 refers to the external environment (temperature, climate, etc.). ) It is formed of stainless steel to have durability and corrosion resistance to the condition.

In the drawings, reference numeral 32 is attached to the locking groove 33 of the body 23 in accordance with the rotation direction of the key (not shown) coupled to the key bundle 26 to lock the handle 27 to the body 23 and Unlocked locker.

The door lock device for heavy equipment according to an embodiment of the present invention is mounted to be opened and closed such as a side door, an engine hood door, a tool door, and the like, which are mounted on the side of the engine compartment, and can be applied to a door requiring locking.

Hereinafter, with reference to the accompanying drawings an example of the use of the door lock device for heavy equipment according to an embodiment of the present invention.

As shown in FIGS. 4 and 6, the latch member 25 formed at the end of the fixed shaft 24 is engaged with the striker 21 mounted on the door frame 20 in a locked state (shown in FIG. 4). being). Therefore, after the key is engaged with the key bundle 26 to release the locking of the handle 27, the door 22 cannot be opened even when the handle 27 is caught and the door 22 is pulled toward the user.

5 and 7 may open the door 22 in the unlocked state of the door lock. When the key is coupled to the key bundle 26 and rotates, the locking of the handle 27 with respect to the body 23 is released. When the handle 27 is turned 90 degrees toward the user around the fixing pin 31, the latch member 25 fixed to the fixing shaft 24 is separated from the striker 21 formed on the door frame 20 and locked. Is released (shown in FIG. 5).

Therefore, the user can grab the handle 27 to rotate the hinge axis (not shown) to secure the door 22 to open.

As described above, after unlocking the handle 27 from the body 23 by the key coupled to the key bundle 26, the handle 27 is latched from the striker 21 by turning the handle 27 by 90 degrees. The locking of the member 25 may be released to open the door 22.

As a result, when working in an environment with poor working conditions, the locking of the door locking device may be prevented from being randomly released by vibration or shock generated in the equipment.

As described above, the door lock device for heavy equipment according to an embodiment of the present invention has the following advantages.

The door lock is made to have sufficient durability against vibrations and shocks generated during operation, and the locking and unlocking of the lock is facilitated by preventing corrosion of the corresponding parts of the lock.

In addition, when working in an environment with poor working conditions, the locking of the door lock device is prevented from being randomly released by vibration, shock, etc. generated in the equipment, thereby having reliability.

Claims (3)

In the door lock device mounted on the door frame of the heavy equipment removably: A striker mounted to the door frame; A body mounted to a space recessed into the door; A latch member fixed to one end of a fixed shaft rotatably coupled to the body and locked and unlocked to the striker; A handle foldably connected to the other end of the fixed shaft and provided with a key bundle; And And a resilient member elastically supporting the fixed shaft in a direction in which the door is closed. The door lock device according to claim 1, wherein at least one of the body, the handle, the elastic member, and the fixing pin connecting the handle to the fixed shaft is made of stainless steel to have corrosion resistance. The door lock device according to claim 1, further comprising a spring washer coupled to the fixed shaft to prevent loosening of the nut supporting the latch member.

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