F - Mech Eng,Light,Heat,Weapons – 16 – N
Patent
F - Mech Eng,Light,Heat,Weapons
16
N
F16N 5/00 (2006.01) B05B 11/00 (2006.01) B05B 11/02 (2006.01) B05C 17/005 (2006.01) F16N 3/12 (2006.01)
Patent
CA 2075603
Abstract of the Disclosure An auto-pull follower is provided for use in a grease gun of the type having a grease reservoir with a piston mounted for reciprocating movement in the reser- voir. The piston is moved in a first direction through the reservoir interior to enable loading grease into the interior or to permit insertion of a grease containing cartridge or collapsible container into the interior, and the piston is moved by a piston spring in the opposite direction through the reservoir to dispense loaded grease from the reservoir interior or from the grease cartridge or collapsible container contained in the interior. The reciprocating piston is provided with a novel auto-pull mechanism comprising a spring biased spool mounted for rotation on the piston, and a flexible cord or chain extending from the spool and out of the reservoir through a hole in a rearward end wall of the reservoir. Pulling the end of the cord outside the reservoir causes the spool to rotate against the bias of the spool spring and causes a length of cord to be unwound from the spool. After unwinding the length of cord from the spool, con- tinued pulling of the cord from the reservoir end wall causes the piston to move against the bias of the piston spring in a direction towards the reservoir end wall. The movement of the piston toward the end wall increases the interior volume of the reservoir and enables the loading of grease into the reservoir interior. Releasing the cord causes the spring bias of the spool to auto- matically retract the length of cord pulled from the reservoir interior back into the reservoir interior and rewinds the length of the cord back on the spool.
Lincoln
Osler Hoskin & Harcourt Llp
LandOfFree
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