Discharging device for a caulking gun
OwnerWu-Hsiung Huanginventor
Life of this patent
Estimating the term…
Abstract
A discharging device for a caulking gun with a ratchet push rod includes a body, a handle, a trigger, a pawl and a ratchet push rod. The ratchet push rod has a series of teeth and passes through the body from one end to the other. The pawl is pivotally mounted in the body to engage the ratchet push rod. Hence, the ratchet push rod moves forward when the trigger is pulled and moves slightly backward before the pawl engages the teeth when the trigger released. The backward movement reduces the residual pressure in the tube to prevent the discharge of caulking material in the tube when the discharging operation is halted.
Claims4
A discharging device for a caulking gun, the discharging device comprising:
- a body with a bottom, a front end and a rear end and two through holes defined respectively in the front end and the rear end;
- a handle formed at the bottom of the body;
- a ratchet push rod with a front end and a series of teeth where the front end passes through the two through holes from the rear end to the front end of the body, and
- a disk mounted on the front end of the ratchet push rod;
- a trigger pivotally attached to the body and having a top end, a front edge and a rear edge, the trigger comprising:
- a guide hole defined in the top end of the trigger;
- a compression spring mounted in the guide hole;
- a sliding block pivotally mounted in the body, slidably mounted in the guide hole and abutting against the compression spring, a drive tooth adapted to push the teeth of the ratchet push rod and formed on the sliding block;
- a release lip formed on the rear edge of the trigger, near the top end of the trigger and facing the handle;
- and
- a tension spring connected between the front edge of the trigger and the body;
- a pawl pivotally mounted on a pivot pin in the body, a pawl tooth adapted to engage the teeth of the ratchet push rod and formed on the pawl, a pawl release formed on the pawl at a side facing the trigger and adapted to be pressed by the release lip of the trigger;
- and
- a biasing rod movably mounted in the body and abutting against the pawl to keep the pawl tooth engaging with the teeth on the ratchet push rod,
- wherein the pivot pin is at a position higher than that of the biasing rod.
Dependencies are inferred from the claim text.