US 6,981,621 B2
Caulking gun
Zeev Brandeis, 7 Alon Street, Rosh Ha'ayin 48560 (Israel); and Rony Granot, 38 Ha'Tzivoni Street, Kiryat Ono 55100 (Israel)
Appl. No. 10/502,938
PCT Filed Jan. 29, 2003, PCT No. PCT/IL03/00071
§ 371(c)(1), (2), (4) Date Mar. 07, 2005,
PCT Pub. No. WO03/064056, PCT Pub. Date Aug. 07, 2003.
Claims priority of provisional application 60/352238, filed on Jan. 29, 2002.
Prior Publication US 2005/0145653 A1, Jul. 07, 2005
Int. Cl. B67D 5/42 (2006.01)
U.S. Cl. 222—392 20 Claims
OG exemplary drawing
 
1. A caulking gun comprising:
an elongated body having an open front end;
a pair of chains situated within said elongated body in coiled fashion, said chains being fixedly interlocked one to another at a front end thereof, a coiled portion of said chains being reversibly interlockable one to another to form a push-rod when extended;
a disk-shaped element attached to said front end of said push-rod;
a self-contained driving mechanism for graduated extension of said coiled portion of said pair of chains in parallel interlocked fashion, forming said push-rod; and
a release mechanism for restoring said pair of parallel chains to their fully retracted, coiled position,
such that by repeated actuation of said driving mechanism, said coiled chains are brought into interlocking contact one with the other, increasing the length of said push-rod, thereby carrying said disk element forward against a caulk cartridge inserted within said elongated body, causing extrusion of material contained within said cartridge.