EP-4121604-B1 - QUICK COUPLER WITH FRONT PIN SAFETY LOCK SYSTEM

Inventors

• OK, Suksan
• HA, JUNGSU

Dates

Publication Date

20260513

Application Date

20200317

Claims (3)

1. A quick coupler apparatus comprising, a body (10); a pivot pin (101) attached to the body (10); a locking arm (100) pivotally attached to the pivot rod (101); an actuator (120) comprising a cylinder (121) and a piston rod (122) which moves in the cylinder (121); a rear wedge (130) attached to the piston rod (122); and a locking guide (110) attached to the rear wedge (130), characterized in that the locking guide (110) further comprising, a release wedge (111) for moving the locking arm (100) into a released status when inserted underneath the locking arm (100), and a locking stopper (112) for maintaining the locking arm (100) to a locked status when positioned above the locking arm (100).
2. The quick coupler apparatus of Claim 1, wherein the locking guide (110) is U-shaped.
3. The quick coupler apparatus of Claim 1, the quick coupler further comprising, a release wedge (311) is configured to be connected to the locking guide (310).

Description

Technical Field The present invention is related to a safety pin lock system for quick coupler used in construction equipment. Background Art In the conventional technology of excavators, quick coupler is mounted at the end of arm and grapples an attachment. It has a hook on front side and hydraulic actuating wedges on rear side. When the rear side wedge is not engaged properly, the quick coupler can drop the attachment and it is very dangerous. By locking the front pin when the rear wedge is extended, dropping an attachment accident can be prevented. US Pat. Pub. No. 2014/0294497 A1 discloses a quick coupler for holding an implement which includes a frame having first and second plates. The quick coupler includes a locking system adapted to lock the implement in the first and second plates. The locking system includes securing latch member and hydraulic actuator connected to the latch member which is configured to move along a guide between the first and second plates. The locking system also includes a set of grooves provided on the securing latch member and a guide. The set of grooves are adapted to lock the securing latch member in a latched position. However, in case of power-off, the quick coupler stops working. Also there is no emergency release mechanism whenever something go wrong and quick release is needed. AU 2013 205 373 Al discloses a similar quick coupler. This invention is to improve the shortcomings listed above. Disclosure of Invention Technical Problem The invention's objective is to provide a safety lock system for front pin in a quick coupler, particularly used for excavators. Another objective is to provide a front pin safety lock system that works even when power off situation. The objects are achieved by the features of the independent claim. The other claims and the description disclose advantageous embodiments of the invention. Solution to Problem According to first aspect of the invention, a quick coupler apparatus comprising body (10), pivot pin (101) attached to the body (10), locking arm (100) pivotally attached to the pivot rod (101), actuator (120) comprising a cylinder (121) and a piston rod (122) which moves in the cylinder (121), rear wedge (130) attached to the piston rod (122) and locking guide (110) attached to the rear wedge (130). Moreover, the quick coupler apparatus's locking guide (110) further comprising release wedge (111) for moving the locking arm (100) into a released status when inserted underneath the locking arm, and locking stopper (112) for maintaining the locking arm (100) to a locked status when positioned above the locking arm. Also, the quick coupler apparatus's locking guide (110) is U-shaped. Also, the quick coupler apparatus further comprising release wedge (311) and the wedge is configured to be connected to the locking guide. Another aspect of the invention, a quick coupler apparatus comprising body (20), front pin lock (201) configured to rotate pivotally to lock in a pin, slide ratchet (200) configured to move forward-backward to force the front pin lock to rotate, actuator (220) comprising a cylinder (221) and a piston rod (222) which moves in the cylinder (221), rear lock (230) connected to the piston rod, links configured to connect the rear lock and the slide ratchet, and casing (240) configured to house a part of the links and a part of the slide ratchet. Also, the quick coupler further comprising pivotal rod (241) protruded from the casing. Also, the quick coupler apparatus's links comprising a first link (211), a second link (212) and a third link (213) and the first link and the second link are movably joined by first link joint (215), and the second link and the third link are movably joined by second link joint (216). Also, the quick coupler further comprising protruded pin (243) configured on the surface of the rear lock (230), and rear lock stroke hole (214) configured within the first link. Also, the quick coupler's second link (212) is connected with the pivotal rod (241) by rod pin (242). Also, the quick coupler's length ratio from the first link joint to pivotal rod and from the pivotal rod to the second link joint is 1 : n. (wherein, n > 0 and n is real number) Also, the quick coupler further comprising first spring (250) configured to connect the front pin lock and the body and second spring (251) placed inside of the casing. Also, the quick coupler further comprising emergency release handler (280) for releasing the front pin quickly. Brief Description of Drawings The present invention together with the above-mentioned and other objects and advantages may best be understood from the following detailed description of the embodiments, but not restricted to the embodiments, wherein is shown: Fig. 1, 2 Quick coupler with front pin safety system according to the first preferred embodiment of the invention from perspective view (Fig. 1) and front the front view (Fig. 2) when the front pin lock is in released status.Fig. 3, 4 Quick