Dispensing – Processes of dispensing
Patent
1996-06-20
1998-07-07
Kaufman, Joseph
Dispensing
Processes of dispensing
222327, 222333, 222391, G01F 1100
Patent
active
057755396
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to viscous material dispensers and more particular to a material dispensing gun adapted to receive a disposal tube of viscous material and having a battery operated electric motor as a power source for dispensing the material.
BACKGROUND
The use of disposable cartridges of caulking material is not only now well established but has become the near universal system for the dispensing of caulking compounds, various sealants and other viscous materials. While hand actuated caulking guns are well known and well established, for a variety of reasons there is a growing demand for powered caulking guns.
Professionals, such as those employed in the construction trade, can suffer excessive fatigue from performing tasks such as applying adhesives to joists and studs when sheet flooring or wall boards are being installed. Indeed, the use of hand actuated caulking guns for such tasks can result in injuries such as carpal tunnel syndrome.
Automobile windshields represent another reason there is a demand for power assisted caulking guns. With many current automotive designs, the windshields have become structural parts of automobiles. In order for a windshield to function as a structural part, a windshield is securely bonded to a surrounding metal frame. The adhesive materials used for this windshield bonding have high viscosity, and dispensing such an adhesive from a cartridge requires extremely high dispensing forces. As a consequence, the installation of such windshields requires a material dispensing gun with which significant force is applied to the material to cause its dispensing.
Air actuated caulking guns which utilize compressed air are known. One commercially successful air actuated gun is described in U.S. Pat. No. 5,181,636 issued Jan. 26, 1993 under the title Incremental Dispensing Device and assigned to the assignee of this patent. Most notably the embodiment shown in FIGS. 4 through 7 of that patent has enjoyed good success in such applications as the dispensing of adhesives on joists for securement of subflooring. While this air actuated gun has enjoyed success, attempts to provide truly portable battery powered caulking guns have enjoyed only limited success.
One problem limiting the success of battery operated guns is the failure adequately to deal with a caulking material performance characteristic known to some as "after ooze". Typically caulking material and other adhesives will contain entrained air or other gases. When dispensing pressure of a caulking gun is stopped, the material being dispensed tends to continue to flow because the entrained gas is under pressure that must be relieved. This means that the pressure applied to a material tube piston should be released so that the expansion of the material being dispensed will be rearward, rather than through the outlet. When the tube piston is allowed to move freely rearwardly, the after ooze problem does not manifest itself, or at least is minimized. With battery operated guns provision for such rearward travel has not been provided other than by reversing the battery driven motor.
With most caulking guns, a rod or equivalent dispensing mechanism engages a piston of a caulking tube cartridge and drives the piston toward the outlet to expel viscous material from the cartridge. Once the material in a cartridge has been expended, it is desirable for the operator to very quickly retract the dispensing mechanism to enable a spent cartridge to be removed from the gun and a new cartridge to be inserted in it. Another shortcoming of prior proposals for battery operated guns is that no prior proposal has had a construction which provided truly simple and quick retraction of a dispensing mechanism.
Applications in which prior battery operated caulking guns could be utilized have been limited by the dispensing forces that could be generated. As an example, prior battery operated guns were not capable of generating sufficient force to dispense the sealants used to fix an automotive windshield to its surrounding meta
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Bates Darryle E.
Kalanish Scott S.
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