Dispensing – With discharge assistant – Container with follower
Patent
1992-12-21
1994-12-13
Kashnikow, Andres
Dispensing
With discharge assistant
Container with follower
B67D 546
Patent
active
053722868
DESCRIPTION:
BRIEF SUMMARY
This invention relates to sealant guns; that is dispensing guns for dispensing viscous sealants from cartridges containing such sealants.
Sealant guns for dispensing sealant from cartridges (which are generally cylindrical) are well known. Such a dispensing gun is disclosed for example in British patent specification 1555455. Such sealant guns are generally largely of metal construction, although more recently, moulded plastics sealant guns have been developed. The mechanical construction of such sealant guns is quite complex, requiring rivets and the like to be used during assembly. Furthermore, point of sale display of a number of such Suns is problematic since their annular end portions make it difficult or impossible to stack a series of sealant guns or hang them side by side on display racks.
According to a first aspect of the invention, there is provided a sealant gun which comprises: between a stock portion and an apertured distal end portion; guided by at least one longitudinally facing aperture in said stock portion; member into engagement with said piston, said trigger means being provided with integral formations on opposed inwardly facing portions arranged to cooperatively engage with complementary shaped pivot formations provided integrally on transversely opposed portions of said stock portion, such that said trigger member is pivotally movable relative to said stock portion between a first position, in which said trigger member is angularly spaced from said handle means, and a second position, in which said trigger member lies adjacent said handle means along complementary lengths thereof; with a part of said stock portion, and, proximate the other end thereof, with said drive member, such that said drive member is biased against said shaped cam end of said trigger member; and piston to be retracted in the longitudinal direction of the gun.
It is preferred that at least the elongate members, stock portion, distal portion and handle means are integrally moulded of a plastics material such as glass fibre reinforced polypropylene or tile like. It is further preferred that the trigger member is also of moulded plastics.
The pivot formations on the stock portion are preferably in the form of raised ribs on shoulders projecting outwardly from opposed faces of the stock portion. In this case, the trigger means is preferably provided with a slot, having opposed internal faces, in the region of the cam end, each of the opposed faces being provided with a recessed region arranged to receive a respective one of the ribs or shoulders provided on the opposed faces of the stock portion. Preferably, each of the recesses is generally triangular in shape with the apex of the triangle arranged to locate and engage with an end of a respective rib or shoulder such that the trigger member is pivotable relative to said stock portion. The sides of the triangular recesses serve to limit the range of movement of the trigger member relative to stock portion since they engage with the shoulders on the stock portion at the limits of pivotal movement of the trigger member.
According to a second aspect of the invention, there is provided a sealant gun which comprises: between a stock portion and an apertured distal end portion, said distal end portion having a generally rectangular outer surface profile: drive a pin, ton in the longitudinal direction such that said piston passes through at least one guiding aperture in said stock portion; and piston to be retracted in the longitudinal direction.
Preferably at least the first and second elongate members, stock and end portions, and handle means ape integrally mouled of plastics, preferably by injection moulding of glass-fibre-reinforced polypropylene.
Advantageously, the aperture in the distal end portion is generally rectangular. It is preferred that the transverse width of the distal end portion is substantially equal to the transverse width of the first and second elongate members.
The invention will now be further described in a particular embodiment, by way of exampl
REFERENCES:
patent: 2720345 (1955-10-01), Slobin
patent: 2877935 (1959-03-01), Sherbondy
patent: 3311265 (1967-03-01), Cyeighton, Jr. et al.
patent: 4072254 (1978-02-01), Cox
patent: 4382530 (1983-05-01), Calisto
patent: 4813574 (1989-03-01), Hwan
patent: 4815663 (1989-03-01), Tada
patent: 5156305 (1992-10-01), Eyre
Bomberg Kenneth
Kashnikow Andres
Schindler Edwin D.
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