Tuck pointing gun with flexible plunger
US4311258A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 30, 1980 |
| Grant date | Jan 19, 1982 |
| Priority date | — |
| Expiry date | May 30, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F11/026
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved tuck pointing gun for repairing masonry structures and the like is provided which includes an elongated, tubular, mortar-receiving barrel, along with an improved, axially shiftable plunger within the barrel which is selectively shiftable therein through the usual ratchet rod and trigger mechanism associated with such guns. The plunger includes a thin, flat, circular, metallic plate having an annular, flexible member coupled thereto. The flexible member includes a forward beveled lip, a radially restricted portion at the region of the plate, and a rearwardly and outwardly extending annular trailing section which engages the barrel wall. The improved plunger wipes the barrel wall as tuck pointing operations proceed, in order to clear such walls of mortar material; the outlet end of the barrel is further provided with an annular, inwardly extending element which nestingly receives the forward lip of the plunger when the latter is at the end of its stroke, and this further assures substantially complete clearing of the barrel during use. The annular trailing section is designed to permit inward deflection thereof in the event that a flow-preventing blockage is presented at …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.