Filter cloth caulking tool

Details Filter cloth caulking tool Filter cloth caulking tool

1999-07-16

2001-02-06

Scherbel, David A. (Department: 3723)

Metal working

Means to assemble or disassemble

To apply or remove a resilient article

C269S288000, C029S278000, C029S281100

Reexamination Certificate

active

06182343

ABSTRACT:

BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to a filter caulking tool.
Some types of filter apparatus, such as filter presses comprise a number of filter plates. Conventionally, both sides of the filter plate are covered with a filter cloth. A central feed hole is provided through the plate. This feed hole is unobstructed by the filter cloth. A connecting device passes through the feed hole connecting the two filter plates. One such arrangement is shown in GB 2088231. The filter cloths need to be secured to the periphery of the filter plates. In some presses a rubber seal is provided between adjacent plates and the cloths are caulked into a groove in the plate which is located just outside the filter area, but within the seal area. A tool is required to achieve this caulking.
Caulking is traditionally achieved by forcing a rope or cord into a groove containing a peripheral region of the filter cloth. This method is very slow and labour intensive in that two people are required for each caulking operation. One is required to hold the cloth in the right position and another is required to caulk the filter. The fact that a press plate will generally need to be removed from the press and laid flat to be caulked, and then turned over and laid flat to install the filter cloth on the other side, makes the known method even more slow and cumbersome, the plates usually being large and heavy. Filter cloths are also often easily damaged by the wedge or hammer. The known caulking method is also a common cause of injury to workers installing the filters, mainly to the band fingers or elbow or wrist ligaments since the rope must be tightly fitted to ensure that it stays in the groove when the filter cloth distorts due to high flow pressures. The fact that workers often have to kneel down to caulk the filters also results in potential back injuries or strains.
The present invention has been made from a consideration of these problems.
SUMMARY OF THE INVENTION
According to the present invention, there is provided a caulking tool comprising means for temporarily securing the tool to a filter apparatus and a pivotally operable caulking body for urging a retaining member into a groove in the filter apparatus so as to capture a part of a filter cloth therein and thus secure the filter cloth to the filter apparatus.
The above referenced apparatus may be used to successfully and speedily caulk a filter cloth to a filter press plate by a single operation with less physical exertion and with a much reduced risk of injury. The apparatus also usually facilitates a better fit of the cloth into the groove of a filter plate.
The means for securing the tool to the filter apparatus preferably comprises a clamp. The tool may be clamped into position on the plate by any standard technique, such as by one or more screw clamps.
The tool preferably comprises a guide body, such as a bar or rod, along which the lever operable caulking body travels in an axial direction parallel to the filter plate groove. The caulking tool preferably comprises a bracket which is connected to the guide body so as to facilitate travel along the guide body. Each end of the guide body is ideally secured to the filter plate, preferably at the plate ends. The ends of the guide body may be secured to parts which are held in an external clamp. This tool can be fixed onto the top, bottom sides or comers of any filter plate. This allows just one person to caulk a filter, with one hand operating the lever and the other hand free to hold the cloth in the correct position.
The caulking body preferably comprises a foot for engaging the retaining member and a handle, which acts as a lever for the foot. The lever preferably pivots about the guide body in a direction perpendicular to the axial direction of movement for the lever. As the lever is pulled towards the operator and away from the plate, in a direction perpendicular to the groove, the base section of the lever is urged toward the plate and into the groove, pressing in the rope and filter cloth.
A further advantage is that the tool may be mounted on a stand outside the press and revolve around the filter plate to follow the groove. Therefore, cloths may be fitted without removing the plate.
The rope or other retaining member being caulked may be loose on top of the cloth or temporarily bonded to it, for example, by sewing, adhesive or pins, or it may be sewn into a hem or false hem around filter cloth periphery.
The guide body may be of any length corresponding to the length of grooves normally found in press plates. The lever foot may be wedge-shaped or T-shaped. The lever, bracket and foot are ideally an integral part. Most of the lever preferably lies about the guide body so that less physical effort is needed to caulk the cloth effectively.
The components may comprise any material, although metal, such as steel, is preferred.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
In order that the present invention may be more readily understood, specific embodiments thereof will now be described by way of example only and with reference to the accompanying drawings in which:


REFERENCES:
patent: 4307503 (1981-12-01), Auld et al.

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