Supports: racks – Special article – Article includes elongated portion
Patent
1989-06-12
1991-09-17
Johnson, Blair M.
Supports: racks
Special article
Article includes elongated portion
335552, A47F 700
Patent
active
050487000
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a tool holder.
Cabinets for the reception and storage of, for example, cylindrical cutters for metal processing, especially drill bits of different diameter--drill bits are always assumed below although the device in accordance with the invention can also be used for cylindrical tools or workpieces of any type--are known and the respective drill bits are inserted in suitably dimensioned storage openings therein for storage and availability. The diameters of the storage openings correspond essentially to the diameters of the respective drill bit. These cabinets come in different dimensions and shapes. Common to all is a bore in the cabinet which matches the particular dimension of the drill bit and, in addition, can be marked with the nominal diameter of the respective drill bit.
The main purpose of these cabinets is to hold the required drill bit in readiness classified by diameter so that the user can locate and again store the desired drill bit more easily. This is more important where drill bits for precision operation are stocked in increments of 0.1 mm. The known cabinets are thus provided with receiving bores of correspondingly narrow tolerances.
When the drill bits being used are in the proper holes, it is easy to locate a particular desired diameter, especially when the nominal diameters are indicated at the holes. Similarly, reinsertion is easy when all of the existing receiving holes are filled with drill bits and only the removed drill bit must once more be inserted in what is then the only available receiving hole. When receiving holes of greatly differing diameter are available, it is also relatively easy to locate the proper hole. Moreover, it is easy to locate the proper receiving hole when the drill bit is new and the nominal diameter stamped therein is still clearly legible. However, due to use, the stamp generally becomes illegible after a very short period and thus becomes unsuitable for determination of the nominal diameter.
A problem arises when receiving holes from adjoining nominal ranges, e.g., 2.3 mm-2.6 mm, are available and the stamped nominal diameters of the drill bits are illegible. If the user is then not completely certain about the diameter, the corresponding receiving hole can only be determined in a time-consuming manner by experimentation. Should this hole increase in diameter, however, due to frequent use, there is a great danger that the respective drill bit will be inserted in the wrong receiving hole. As a result, use of the improperly classified drill bit without a check will result in the production of an improper bore which can make the workpiece unusable and thereby lead to high costs.
In practice, therefore, the drill bits must be measured with a caliper rule prior to storage. Very often, however, this is omitted for the sake of convenience or because no caliper rule is available at the moment. The drill bits are simply randomly inserted in one of the free holes and the abovementioned problem accordingly arises very frequently. Furthermore, the measurement with the caliper rule and the reading of the value, as well as insertion in the appropriate receiving hole, are relatively time-consuming and troublesome.
It is an object of the invention to provide a holder which allows reliable classification of cylindrical workpieces to be accomplished rapidly and without great vigilance.
This object of the invention is achieved in that the holder has a gauge associated with each receiving hole as well as a fine gauge guide in the form of an elongated measuring channel. The gauges are disposed at or in the channel and the receiving holes are provided in a marginal region thereof.
Thus, the invention proposes that an appropriate gauge be associated with each receiving hole of a holder. The gauges are matched to the increment in nominal diameter and can be connected to one another.
In general, drill bits of a specific size are arranged in a row, e.g., the sizes ranging from 4.1 mm to 5.O mm in increments of 0.1 mm in a first row and the sizes ranging
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Johnson Blair M.
Kontler Peter K.
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