Metal working – Scale remover or preventor – Scraper or scalper
Patent
1988-12-14
1991-06-25
Terrell, William E.
Metal working
Scale remover or preventor
Scraper or scalper
30513, B23D 7106
Patent
active
050255401
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to file holders, that is to articles to which a file blade is attached when in use, to facilitate handling and use of the blade. The present invention relates in particular to holders for flexible file blades.
Flexible file blades are manufactured for use for a variety of operations on various materials. For instance, blades with various degrees of coarseness are manufactured. In some applications, the blade is used in a straight, unflexed condition, but in other applications, it may be desirable for the blade to be flexed.
A file holder has been proposed which allows the file blade to be held in a flexed condition and which allows the degree of flexing to be selected. The blade is attached to a base member, the ends of which are connected by a screw connection. The screw connection may be tightened or loosened to draw the ends of the base together, thereby flexing the blade, or to allow the base and blade to relax and straighten.
This proposal has been found to have disadvantages. The need for carefully machined screw threads and for associated components of sufficient strength unduly increases manufacturing costs. Furthermore, it is found in practice that when the degree of flexing is to be changed considerably, for instance to take the blade from its unflexed condition to the maximum degree of flexing, operation of the screw connection is unduly time-consuming.
It is an object of the present invention to obviate or mitigate these or other disadvantages of the prior art.
According to the present invention there is provided a file holder comprising first and second attachment means for attaching a flexible file blade to the holder at two spaced positions, a first member incorporating a cam surface and being so connected to the first attachment means as to be movable with respect thereto, a second member connected to the second attachment means and incorporating a cam follower bearing on the cam surface, the cam surface being so shaped as to vary the separation of the attachment means as the first member moves, whereby a file attached to the holder may be variably flexed.
Preferably a flexible base member is provided which carries the attachment means and the first and second members. The attachment means may be detachable from the base member. Preferably the attachment means and the base member are so arranged that a file mounted in the holder lies along the base, the base and the file flexing together as the first member is moved.
Preferably the first member is rotatable on the base member. The first member may rotate about a first axis, the cam surface being circular and centered on a second axis. Preferably the first member comprises an arcuate slot, the walls of which provide the cam surface. The cam surface may be formed by the surfaces of a groove or recess in the slot walls.
Preferably the second member extends into the slot, and the cam follower comprises a lug which engages the cam surface provided by the walls. The cam follower may comprise a second, oppositely directed lug engaging a second cam surface, the cam surfaces being provided by respective walls of the slot. Preferably the mouth of the slot is relatively narrow and the width of the slot in the region of the cam surface is relatively wide, whereby the lugs retain the second member in the slot. Preferably the first member comprises two parts each providing one of the cam surfaces and attachable together to form the slot therebetween.
Preferably the second member is in the form of a bar having the cam follower at a first end and being rotatably attached to the second attachment means at its second end. Preferably the second end is attached to the base member by means of two lugs attached to the base member and between which the second end is located by means of co-operating pins and sockets. Preferably the walls of the sockets define entrance slots through which the pins may enter the sockets. The pins may be a snap-fit through the entrance slots. There may be provided an opening in the base member between th
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Adams, III. W. Thad
Terrell William E.
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