Manual viscous liquid dispensing device having a locking mechanism
A product dispensing device includes a body having a first end and a second end; a product holding mechanism at the first end; a plunger defining a rack, supported by and extending through the product holding mechanism and the body from the first end to the second end; a drive mechanism, pivotally coupled to the body, including a trigger, a trigger return spring, and a pawl connected to the trigger via a pawl bias spring for bringing the pawl into contact with the plunger, the pawl having pawl teeth shaped to complement the rack; and a locking mechanism configured to limit a movement of the plunger in a rearwards direction while the locking mechanism is in a locked configuration.
1 . A product dispensing device comprising:
a body having a first end and a second end;
a product holding mechanism at the first end;
a plunger defining a rack, supported by and extending through the product holding mechanism and the body from the first end to the second end;
a drive mechanism, pivotally coupled to the body, including a trigger, a trigger return spring, and a pawl connected to the trigger via a pawl bias spring for bringing the pawl into contact with the plunger, the pawl having pawl teeth shaped to complement the rack; and
a locking mechanism configured to limit a movement of the plunger in a rearwards direction while the locking mechanism is in a locked configuration,
wherein when a user actuates the trigger, the pawl teeth are configured to move the plunger forward toward the first end of the body.
2 . The product dispensing device of claim 1 wherein the locking mechanism is configured to mechanically lock to a component of the product dispensing device.
3 . The product dispensing device of claim 1 wherein the locking mechanism is configured to mechanically lock to the rack.
4 . The product dispensing device of claim 1 wherein the locking mechanism is configured to allow a movement of the plunger in a direction opposite the rearwards direction while the locking mechanism is in a locked configuration.
5 . The product dispensing device of claim 1 wherein the locking mechanism is configured to allow a movement of the plunger in the rearwards direction while the locking mechanism is in an unlocked configuration.
6 . The product dispensing device of claim 1 wherein the locking mechanism is configured to be placed in an unlocked configuration in response to operation of a pawl release button.
7 . The product dispensing device of claim 1 wherein the locking mechanism is implemented as part of a pawl release button.
8 . The product dispensing device of claim 7 wherein the pawl release button comprises arms and the pawl release button comprises locking teeth arranged on the arms.
9 . The product dispensing device of claim 8 wherein the locking teeth are configured to engage with a locking rack arranged on the plunger.
10 . The product dispensing device of claim 9 wherein the locking rack are configured with a first surface and a second surface and there is an angle between the first surface and the second surface.
11 . The product dispensing device of claim 1 wherein:
the locking mechanism is implemented as part of a pawl release button;
the pawl release button comprises arms and locking teeth arranged on the arms; and
the locking teeth are configured to engage with a locking rack arranged on the plunger.
12 . The product dispensing device of claim 11 wherein the locking rack are configured with a first surface and a second surface and there is an angle between the first surface and the second surface.
13 . The product dispensing device of claim 1 wherein the locking mechanism is implemented as part of an external pawl release button.
14 . The product dispensing device of claim 13 wherein the external pawl release button comprises a locking pawl tooth support that extends into the pawl.
15 . The product dispensing device of claim 14 wherein the pawl comprises a slot to accommodate the locking pawl tooth support.
16 . The product dispensing device of claim 15 wherein the locking pawl tooth support includes a locking pawl tooth configured to engage with the rack of the plunger.
17 . The product dispensing device of claim 1 wherein the product dispensing device further comprises a pawl release feature connected to at least one of the body and the pawl for allowing a user to place the locking mechanism in an unlocked configuration.
18 . The product dispensing device of claim 1 wherein the product dispensing device further comprises a pawl release feature connected to at least one of the body and the pawl for allowing a user to disengage the pawl from the plunger.
19 . The product dispensing device of claim 1 wherein when the drive mechanism is unactuated the pawl teeth do not engage the rack.
20 . A product dispensing device comprising:
a body having a first end and a second end;
a product holding mechanism at the first end;
a plunger defining a rack, supported by and extending through the product holding mechanism and the body from the first end to the second end;
a drive mechanism, pivotally coupled to the body, including a trigger, a trigger return spring, and a pawl connected to the trigger via a pawl bias spring for bringing the pawl into contact with the plunger, the pawl having pawl teeth shaped to complement the rack; and
a locking mechanism configured to limit a movement of the plunger in a rearwards direction while the locking mechanism is in a locked configuration,
wherein when a user actuates the trigger, the pawl teeth are configured move the plunger forward toward the first end of the body, and when the user releases the trigger, the pawl teeth are configured to slide back over the rack allowing the user to further advance the plunger upon subsequent actuation of the trigger.