Push type locking structure for pipe couplers

1. A push type locking structure for pipe couplers, comprising:

a coupling pipe having a first end and a second end and internally defining a passage; and the coupling pipe being provided on an outer surface at a position between the first and the second end with a recess having a pair of pipe pivotal holes located perpendicular to the recess, and on the outer surface at a position closer to the first end with a receiving hole that extends radially through the outer wall of the coupling pipe and communicates with the passage;

a push member having a pair of first pivotal connection sections and a second pivotal connection section provided on a bottom side thereof; and the first pivotal connection sections respectively having a first pivotal hole provided thereon and the second pivotal connection section having a second pivotal hole provided thereon;

a push retaining member defining an opening, and having a retaining pivotal hole provided at a top portion thereof;

at least two shafts, one of which is extended through the first pivotal holes and the retaining pivotal hole and the other of which is extended through the second pivotal hole and the pipe pivotal holes, such that the push member is pivotally connected to the push retaining member and to the coupling pipe; and

a spring located in the recess with two ends elastically pressed against the bottom of the recess and the bottom side of the push member; and

wherein when the push member is pushed downward, the spring is elastically compressed and the push retaining member is lifted upward radially at the same time, such that the push retaining member no longer limits a pipe connected to the coupling pipe from moving axially and the pipe is unlocked from the coupling pipe.

2. The push type locking structure for pipe couplers as claimed in claim 1 , wherein the coupling pipe has a second pipe and a first pipe connected to the first end and the second end thereof, respectively; the first pipe including an engaging section inserted into the second end of the coupling pipe, and the second pipe including a coupling section inserted into the first end of the coupling pipe to connect to the engaging section of the first pipe; the second pipe being provided at a middle section with a locating groove extending around the second pipe, and the push retaining member being engaged with the locating groove to limit the second pipe from moving axially relative to the coupling pipe.

3. The push type locking structure for pipe couplers as claimed in claim 2 , wherein an end of the first pipe located opposite to the engaging section is connectable to a first pipe connecting head, and an end of the second pipe located opposite to the coupling section is connectable to a second pipe connecting head.

4. The push type locking structure for pipe couplers as claimed in claim 2 , wherein the coupling pipe includes a rotating mechanism located between the second end and the engaging section of the first pipe.

5. The push type locking structure for pipe couplers as claimed in claim 4 , wherein the rotating mechanism includes at least one pair of pin holes formed on a wall of the coupling pipe at the second end to perpendicularly penetrate the wall in a radial direction, and a stop pin for connecting to between each pair of the pin holes; the stop pins being respectively extended into one pair of pin holes to be fixedly held to an inner wall surface of the second end of the coupling pipe, and the stop pins being adapted to engage with an annular groove formed on an outer wall surface around the engaging section of the first pipe.

6. The push type locking structure for pipe couplers as claimed in claim 1 , wherein the coupling pipe has a blind hole provided on the bottom of the recess, and the push member being provided on the bottom side with a locating hole corresponding to the blind hole; and the two ends of the spring being elastically pressed against the blind hole and the locating hole.

7. The push type locking structure for pipe couplers as claimed in claim 6 , wherein the recess on the coupling pipe consists of a front section, a middle section, and a rear section; the middle section being connected to between the front and the rear section and having a recess depth larger than those of the front and the rear section; and the front and the rear section having an opening facing toward the second pipe and the first pipe, respectively.

8. The push type locking structure for pipe couplers as claimed in claim 7 , wherein the front, the middle, and the rear section of the recess together define a curved bottom for the recess, and the second pivotal connection section of the push member having a lower end forming another curved bottom corresponding to the curved bottom of the recess.

9. The push type locking structure for pipe couplers as claimed in claim 7 , wherein the second pivotal connection section of the push member has a width smaller than a width between two side walls of the recess, and the pair of pipe pivotal holes being perpendicularly extending through the two side walls of the recess.