Chucks or sockets – With fluid-pressure actuator – Socket type
Patent
1998-04-09
1999-11-09
Pitts, Andrea L.
Chucks or sockets
With fluid-pressure actuator
Socket type
279 51, 279 58, 408239A, 409232, 409234, B23B 522
Patent
active
059799110
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF INVENTION-BETWEEN
1. Field of Invention
The present invention relates to a procedure for fastening an object in a holding device, as defined in the preamble of claim 1, and to a hydraulic holding device as defined in the preamble of claim 4.
2. Description of Related Art
Several types of hydraulic holding devices are used to fasten tools, work pieces and various shafts. However, prior-art solutions have the drawbacks that they require a large space and are structurally unbalanced, preventing the use of high rotational speeds. Previously known are also small-sized holding devices that make use of the thermal expansion of metals. The drawbacks of these devices are a narrow tolerance range, difficult fastening and releasing procedures and a reduced accuracy due to multiple fastening and releasing operations, which always require heating and cooling. Another drawback with many prior-art holding devices is that their holding force is insufficient to hold objects having notches in them. A notch may be e.g. a segment removed from a cylindrical shaft over part of its length. A further drawback with prior-art holding devices is that their restraint moment varies with the temperature.
SUMMARY OF THE INVENTION
The object of the present invention is to eliminate the drawbacks mentioned above and to achieve an improved holding device which is applicable for use for the fastening of objects in varying temperature conditions. The procedure of the invention is characterized by what is presented in the characterization part of claim 1, and the holding device of the invention is characterized by what is presented in the characterization part of claim 4. Other embodiments of the invention are characterized by what is presented in the other claims. The advantages of solution of the invention include a small size and an accurate holding device whose accuracy and holding capacity are preserved regardless of temperature variations. An additional advantage is a high restraint force achieved in a simple manner.
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.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
FIG. 1 presents a side view of a fastening arrangement according to the invention,
FIG. 2 presents another solution according to the invention, in which the object is fastened in a holding device on an expandable dowel-shaped holding part, and
FIG. 3 presents a third solution as provided by the invention.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a holding device 1 comprising a frame which is mounted on a working machine or other substantially fixed body and has a gripping head 4 into which the object to be held by the device is placed. Such an object may be e.g. a drill bit or equivalent placed in a holding collet 2. In addition, the frame comprises a mounting head 5 by which the holding device itself is connected to the substantially fixed body. In the gripping head 4 there is a bore 13 which is coaxial with the centre axis of the entire holding device. The bore 13 is deep enough to accommodate a holding collet 2 suited for the fastening of a tool or the like. The bore has a conical shape tapering in the direction of its depth; The angle of taper is so selected that a holding collet 2 of a conical external shape placed in the bore will be retained in it by itself.
As an extension of the bore, there is a second bore inside the holding device, which se
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patent: 5096213 (1992-03-01), Terwilliger et al.
patent: 5820136 (1998-10-01), Han et al.
Pitts Andrea L.
Smith Monica
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