Dispensing – With cutter and/or punch
Reexamination Certificate
2000-07-20
2001-09-11
Derakshani, Philippe (Department: 3754)
Dispensing
With cutter and/or punch
Reexamination Certificate
active
06286718
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an improved dispensing gun for use in the building trade.
SUMMARY OF THE INVENTION
Conventionally, in the building trade, the filling of joints between paving slabs, brickwork, floor tiles, wall tiles etc. with cement, plastics, adhesives or fillers etc., has been done manually, and this is a very messy, difficult and time consuming task. Known dispensing guns are generally disposable, and have a fitted nozzle of one size. Such dispensing guns can only inject material and are generally difficult to refill. Known dispensing guns can only be used for the purpose of dispensing.
It is an object of the present invention to overcome the problems of jointing of the past.
It is a second object of the present invention to provide a dispensing gun which enables material to be injected or drawn up, easily.
It is a further object of the present invention to provide a dispensing gun which is reusable, easy to clean and designed to fit refillable and ready-to-use cartridges of varied sizes.
A still further object of the present invention provides a piston to be used inside a cartridge, which has a good seal and eases injection of material.
A yet further object of the present invention provides a dispensing gun which can be used for additional purposes, in particular, with an attachable clamp for compressing objects to be adhesively bonded.
According to one aspect of the present invention there is provided a dispensing gun for use with a cartridge, comprising a frame supporting a piston rod and one or more operating levers connected to the frame and acting on the piston rod, wherein a reversible ratchet mechanism is carried on the piston rod and operated on by one or more operating levers for reciprocal motion of the piston rod, characterised in that the reversible ratchet mechanism comprises a pair of springs separated by a forward washer and a reverse washer, the forward washer having a forward tang extending radially and outwardly therefrom, and the reverse washer having a reverse tang extending radially and outwardly therefrom.
Preferably, one or more operating levers are provided with a forward or reverse portion arranged to impart movement to the respective washer through selectable contact with respective forward and reverse tangs.
Again preferably, the operating lever is pivotally connected to a reversing arm which imparts movement to the washer by means of the reverse tang when the washer is in a reverse position.
The operating levers may be pivotally or slidably connected to the frame and the frame may have a receiving socket which connects to form a seal with an attachment means on the cartridge.
Advantageously, the piston rod is attached to a piston in the cartridge, the piston comprising a hollow rigid member and a flexible member, the flexible member having a periphery which maintains a movable seal with the inside wall of the cartridge, a space being formed between the rigid member and flexible member allowing movement of the flexible member into the space. The periphery of the flexible member may have angled sides forming a movable sealed fit with the inside walls of the cartridge.
Preferably, the cartridge has a nozzle of copper to deformably fit into a dispensing tube, the dispensing tube being removably attached to the cartridge.
A restraining means may be attached to the frame which comprises, a restraining member carried on the piston rod and movable by a displacement means; in a first position the restraining member abuts a fixed abutment means and frictionally engages the rod to prevent movement of the rod in one direction, in a second position the restraining member does not engage the rod.
Preferably, the displacement means comprises a slidable abutment means having a displacing member, the restraining member being moved from the first position to the second position by sliding the slidable abutment means so that the restraining member is displaced by the displacing member.
Again preferably, the restraining member is a washer carried on the piston rod.
A clamping structure may be removably attached to the dispensing gun when the cartridge is removed, the clamping structure having a spine, a fixed plate being fixed on the spine and a slidable plate being slidable along the spine and acted upon by the piston, the arrangement being such that, in use, objects to be adhesively bonded can be fixed between the fixed plate and the slidable plate and held under compression.
According to a further aspect of the present invention there is provided a piston for use with a cartridge, wherein the piston is attachable to a piston rod in a cartridge, the piston comprising a hollow rigid member and a flexible member, the flexible member having a periphery which maintains a movable seal with the inside wall of the cartridge, a space being formed between the rigid member and the flexible member allowing movement of the flexible member into the space.
Preferably, the periphery of the flexible member has angled sides forming a movable sealed fit with the inside walls of the cartridge.
REFERENCES:
patent: 2768768 (1956-10-01), Cornell et al.
patent: 2895773 (1959-07-01), McConnaughey
patent: 4335834 (1982-06-01), Zepkin
patent: 0 406 113 (1991-01-01), None
patent: 2 172 059 (1986-09-01), None
Bui Thach H
Derakshani Philippe
Jacobson & Holman PLLC
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