Abstract Hand-held gun for inflating and deflating large volume balloons by the use of a syringe having a barrel and a syringe plunger having a head and slidably mounted in the barrel. The gun is provided with a handle adapted to be grasped by the hand. A housing is carried by the handle and is adapted to receive and retain the barrel of the syringe. A plunger rod is provided which has proximal and distal extremities and is slidably mounted in the handle for movement in a direction parallel to the movement of the syringe plunger between forward and rearward positions. A sleeve is secured to the proximal extremity of the plunger rod and extends coaxially for at least a portion of the plunger rod. A coil spring is mounted on the plunger rod for yieldably urging the plunger rod in a direction axially of the plunger rod toward the rearward position. A plate is secured to the sleeve and is adapted to be removably secured to the head of the syringe plunger. A gripper is pivotally mounted on the handle and engages the plunger rod for progressively advancing the plunger rod towards a forward position against the force of the coil spring to advance the syringe plunger in the barrel for causing an inflating liquid to be discharged from the barrel for inflation of the balloon. A trigger is pivotally mounted on the handle for releasing the plunger rod from a forward position to permit the spring means to return the plunger rod to a rearward position and to carry with it the syringe plunger to aspirate fluid from the balloon to cause deflation of the balloon.
In a hand-held gun for inflating and deflating large volume balloons by the use of a syringe having a barrel and a syringe plunger having a head and slidably mounted in the barrel, a handle adapted to be grasped by the hand, housing means carried by the handle adapted to receive and retain the barrel of the syringe, a plunger rod having proximal and distal extremities slidably mounted in said handle for movement in a direction parallel to the movement of the syringe plunger between forward and rearward positions, a sleeve secured to the proximal extremity of the plunger rod and extending coaxially for at least a portion of the plunger rod, spring means mounted on the plunger rod for yieldably urging said plunger rod in a direction axially of the plunger rod toward the rearward position, means secured to the sleeve and adapted to be removably secured to the head of the syringe plunger, gripper means pivotally mounted on said handle and engaging said plunger rod for progressively advancing said plunger rod towards a forward position against the force of the spring means to advance said syringe plunger in the barrel for causing an inflating liquid to be discharged from the barrel for inflation of the balloon, and trigger means pivotally mounted on the handle for releasing said plunger rod from a forward position to permit said spring means to return said plunger rod to a rearward position and to carry with it the syringe plunger to aspirate fluid from the balloon to cause deflation of the balloon.
Claim 2
Dependent Claim
259 words
In a hand-held gun for inflating and deflating large volume balloons by the use of a syringe having a barrel and a syringe plunger having a head and slidably mounted in the barrel, a handle adapted to be grasped by the hand, housing means carried by the handle adapted to receive and retain the barrel of the syringe, a plunger rod having proximal and distal extremities slidably mounted in said handle for movement in a direction parallel to the movement of the syringe plunger between forward and rearward positions, a sleeve secured to the proximal extremity of the plunger rod and extending coaxially for at least a portion of the plunger rod, spring means mounted on the plunger rod for yieldably urging said plunger rod in a direction axially of the plunger rod toward the rearward position, means secured to the sleeve and adapted to be removably secured to the head of the syringe plunger, gripper means pivotally mounted on said handle and engaging said plunger rod for progressively advancing said plunger rod towards a forward position against the force of the spring means to advance said syringe plunger in the barrel for causing an inflating liquid to be discharged from the barrel for inflation of the balloon, and trigger means pivotally mounted on the handle for releasing said plunger rod from a forward position to permit said spring means to return said plunger rod to a rearward position and to carry with it the syringe plunger to aspirate fluid from the balloon to cause deflation of the balloon.
Claim 3
Dependent Claim
15 words
A gun as in claim 1 wherein said spring means extend coaxially into said sleeve.
Claim 4
Dependent Claim
34 words
A gun as in claim 1 wherein said means secured to said sleeve include a plate secured to said sleeve and having a recess therein adapted to receive said head of the syringe plunger.
Claim 5
Dependent Claim
23 words
A gun as in claim 3 wherein said plate is movable into and out of engagement with said head of said syringe plunger.