Dispensing – With casing or support – Ambulant
Patent
1991-06-14
1993-07-20
Kashnikow, Andres
Dispensing
With casing or support
Ambulant
222612, 222333, 222327, 401 48, 401193, B67D 564
Patent
active
052286053
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a hand tool and, more particularly, to a hand tool having a guide device for applying a free-flowing pasty material to a base.
A hand tool for applying a free-flowing pasty material, an adhesive and/or a sealant, comprises a container with a nozzle and displaceable base, a piston device for forcing the material from the nozzle and guide means supporting and guiding the hand tool during operation.
Such a hand tool is known from U.S. Pat. No. 3,550,815. A hand tool constructed according to this patent is provided with a drive for delivering free-flowing material through a nozzle. The drive is an electric motor which moves a piston in a cylinder via a gear unit and accordingly moves the free-flowing material located in the pressing cylinder to the nozzle. A roller is arranged directly in front of the nozzle, which roller serves to distribute the material when placed on a base, e.g. on a workpiece to be treated.
It is difficult to achieve a uniform application of the material along the length of the surface to be treated with this hand tool, especially in working positions which are uncomfortable for the worker and when the surfaces to be treated are uneven or irregular. In such cases, application with the known hand tool results in interruptions and irregularities or messiness. This is especially unacceptable for visible surfaces.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved automatically guided hand tool for applying free-flowing pasty materials to a base, which has none of the above-mentioned disadvantages.
This object and others which will be made more apparent hereinafter are attained in a hand tool for applying free-flowing pasty materials including adhesives and/or sealants to a base comprising a nozzle and means for containing the free-flowing pasty material communicating with the nozzle, means for forcing the free-flowing pasty material out of the means for containing through the nozzle and guide means for supporting and for guiding the hand tool during application of the free-flowing pasty material to the base.
According to the invention, the guide means includes a first housing part attachable to the means for containing the free-flowing pasty material; a rotatable base-bearing member, which can be a wheel, roller or ball and is held in the first housing part at a distance from the nozzle which is adjustable; means for adjusting the position of the base-bearing member relative to the nozzle; a first drive including a first electric motor connected to the rotatable base-bearing member to drive the rotatable base-bearing member rotatably to provide a controlled movement of the guide means and hand tool over the base during application of the free-flowing pasty material when the base-bearing member contacts the base; and means for selecting a rotation direction of the base-bearing member under control and operation of the first drive such that the base-bearing member is rotatable in another direction opposite to the rotation direction selected by the means for selecting and independently of the first drive.
A hand tool according to the invention has the advantage that the person working with the hand tool need only place the latter on the surface to be treated, whereupon the hand tool is moved automatically by the controllable first drive and guide means. The quantity of material to be applied can be varied by varying the feed speed of the guide means or adjusting the delivery quantity output. The feed direction and the feed speed of the hand tool can be regulated by pressing a switch.
The work of the operator is considerably reduced, so that all his attention can be turned to monitoring the nozzle position. The performance and quality of the work which can be achieved in this way is improved.
The selecting means provided allows selection of a predetermined guide direction during operation of the first drive to guide the hand tool in a controlled manner over the base, however to facilitate application o
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Bomberg Kenneth
Kashnikow Andres
Robert & Bosch GmbH
Striker Michael J.
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