Bipod with compressively popping up inner leg assemblies

Abstract

A bipod with a mechanism for compressively popping up from rear-ends of pipes, comprising: a bracket assembly; at least two pop up inner leg assemblies pivotally connected to the bottom of the bracket assembly; wherein the pop up inner leg assembly comprises: an out pipe accommodating a compression spring and an inner leg; an inner leg having a first state of completely retracting into the out pipe and a second state of completely protruding from the out pipe; a compression spring located inside the out pipe and abutting against one end of the inner leg towards the out pipe; a switch unit for releasing and locking the inner leg; wherein, in use, the inner legs are released from the first state and pop up into the second state with the elastic force of the compression spring when the switch unit is triggered.

What is claimed is: 
     
         1 . A bipod with compressively popping up inner leg assemblies, comprising:
 a bracket assembly;   at least two pop up inner leg assemblies pivotally connected to the bottom of the bracket assembly;   wherein the pop up inner leg assembly comprising:   an out pipe accommodating a compression spring and an inner leg;   an inner leg having a first state of completely retracting into the out pipe and a second state of completely protruding from the out pipe;   a compression spring located inside the out pipe and abutting against one end of the inner leg towards the out pipe;   a switch unit for releasing and locking the inner leg;   
       wherein, in use, the bracket assembly is installed on an object to be supported, the inner leg assemblies are unfolded and the inner legs are released from the first state and pop up into the second state with the interposition of the elastic force of the compression spring when the switch unit is triggered. 
     
     
         2 . The bipod with compressively popping up inner leg assemblies according to  claim 1 , wherein the switch unit comprises a component for locking the position of the inner leg in the first state or the second state, the component for locking the position comprises a switch lock, a switch positioning pin and a switch resetting spring. 
     
     
         3 . The bipod with compressively popping up inner leg assemblies according to  claim 2 , wherein when the inner leg needs to pop up from the first state to the second state, the switch lock is pressed and then the inner leg is released and pop up from a rear-end of the out pipe with the interposition of the elastic force of the compression spring until a proximal flange of the inner leg contacts with a stopping unit inside the out pipe, at this moment the inner leg protrudes from the first state to the second state. 
     
     
         4 . The bipod with compressively popping up inner leg assemblies according to  claim 2 , wherein when the inner leg needs to retract from the second state to the first state, the switch lock is pressed and then the inner leg is pushed inward from the rear-end of the out pipe until the switch lock clicks into a distal notch of the inner leg automatically with the interposition of the force of the switch positioning pin and the switch resetting spring to lock a longitudinal displacement of the inner leg, at which moment the inner leg retracts from the second state to the first state while the compression spring installed inside the out pipe is compressed to the shortest state. 
     
     
         5 . The bipod with compressively popping up inner leg assemblies according to  claim 1 , wherein the inner leg is provided with a plurality of notches, and a section between each two notches on the inner leg is defined as a segment; the inner leg has a third state of partially retracting into the out pipe. 
     
     
         6 . The bipod with compressively popping up inner leg assemblies according to  claim 5 , wherein the switch lock is pressed and then the inner leg is pushed inward when the inner leg needs to retract from the second state to the third state or the first state; so that for each segment pushed inside, the switch lock clicks into the notches of the inner leg automatically to lock a longitudinal displacement of the inner leg with the interposition of the force of the switch positioning pin and the switch resetting spring. 
     
     
         7 . The bipod with compressively popping up inner leg assemblies according to  claim 1 , wherein a proximal end of the inner leg towards the out pipe is provided with a leg stop, with a plastic collar provided on the leg stop and around the leg stop and abutting against an inner wall of the out pipe. 
     
     
         8 . The bipod with compressively popping up inner leg assemblies according to  claim 1 , wherein the compression spring does not contact with the proximal end of the inner leg towards the out pipe when the inner leg is in the second state. 
     
     
         9 . The bipod with compressively popping up inner leg assemblies according to  claim 2 , wherein the switch lock has an annular portion with a protrusion part freely extending through the another aperture on a side wall of the out pipe, wherein the protrusion part protrudes towards the axis of the out pipe; the annular portion together with the switch lock forms a L-shaped part which is biased by the switch resetting spring located inside the switch positioning pin below the switch lock, to selectively engage notches on a side wall of the inner leg, so as to lock the inner leg with its protrusion or to retract the inner leg with respect to the out pipe. 
     
     
         10 . The bipod with compressively popping up inner leg assemblies according to  claim 3 , wherein when the inner leg fully protrudes to the second state, the protrusion part of the annular portion of the switch unit moves upwardly and engages with a proximal notch on the far left of the inner leg to maintain the second state of the inner leg. 
     
     
         11 . The bipod with compressively popping up inner leg assemblies according to  claim 1 , wherein the popping up of the inner leg depends on elastic potential energy of the compression spring; the compression spring is designed to have enough potential energy to overcome the friction of a plastic collar and/or the mass of the inner leg, for the inner leg popping up to the second state or a state proximate to the second state, and while the inner leg is in the first state or a state proximate to the first state, to compressively bias the compression spring between an end surface of the leg stop and one end of the out pipe proximate to the bracket assembly, for gathering elastic potential energy.