Abrading – Frame or mount – For hanging rigid – rotary abrading tool
Patent
1995-11-17
1997-07-29
Eley, Timothy V.
Abrading
Frame or mount
For hanging rigid, rotary abrading tool
451178, 82160, 408239R, 409232, B24B 4500
Patent
active
056517262
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a mounting apparatus for securing alternative grinding wheels to the output shaft of a portable rotary grinding machine, in which a threaded clamping device is used for cooperation with a threaded portion of the output shaft.
This new type of mounting means is intended to meet the securing requirements set up both for so called depressed centre grinding wheels and for plane cutting wheels.
SUMMARY OF THE INVENTION
The mounting apparatus according to the present invention comprises a hub and two alternative clamping elements and is intended to accomplish both an outer annular clamping zone for cutting wheels and an inner annular clamping zone for depressed centre wheels.
According to the securing requirements, each type of grinding wheel shall be clamped between a set of annular clamping surfaces which rise above surrounding portions of the hub and the clamping elements, respectively, (for example by at least 0.5 mm). The difference between the two sets of clamping surfaces is that the clamping surfaces intended for the cutting wheel have to be larger in diameter than the clamping surfaces for the depressed centre wheel.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a longitudinal section through the mounting device according to the invention when securing a depressed centre wheel.
FIG. 2 shows a similar section as in FIG. 1 but illustrates a plane cutting wheel being secured.
FIG. 3 shows a longitudinal section through the front part of the output shaft and the support hub.
FIG. 4a shows a longitudinal section through the clamping element intended for depressed centre wheels.
FIG. 4b shows a longitudinal section through a clamping element intended for cutting wheels.
FIG. 5 shows an end view of the support hub shown in FIG. 3.
DETAILED DESCRIPTION
The new mounting means shown in the drawing figures comprises a support hub 10 rigidly mounted on the output shaft 11 of a rotary grinding machine. The support hub 10 is coupled to the shaft 11 by a tapered socket portion 12 and a woodruff key 15. As being apparent from FIGS. 3 and FIG. 5, the support hub 10 is formed with an inner annular contact surface 13 and an outer annular contact surface 14. The outer and inner contact surfaces 13, 14 are spaced from each other by an annular groove 16 which is at least 0.5 mm deep from any of the contact surfaces 13, 14. In the illustrated embodiment of the invention, the outer contact surface 14 protrudes in front of the inner contact surface 13 by a distance of about 0.5 mm.
As an axial continuation of the tapered socket portion 12, the hub 10 is formed with a cylindrical socket 17 which is open at the front end of the hub. The opening end of the socket 17 is surrounded by a tubular extension 18 which protrudes axially in front of both the inner and outer contact surfaces 13, 14 so as to form a centering portion for the grinding wheels.
In FIG. 4a there is shown a flanged clamping element 20 which is formed with an annular contact surface 21 of a size equal to the inner contact surface 13 of the hub 10. The clamping element 20 also comprises an axially extending neck portion 22 which is intended to fit snugly in the socket 17 of the hub 10.
In FIG. 4b there is shown another clamping element 23 which is formed with a radial flange on which there is annular contact surface 24 of a size equal to the outer contact surface 14 of the hub 10. This clamping element 23 also comprises an axially extending neck portion 25 which is intended to fit snugly in the socket 17 of the hub 10.
As being illustrated in FIGS. 4a and 4b, both of the clamping elements 20, 23 are provided with a stepped bore 26 and 27, respectively, through which a clamping screw 28 extends to engage a threaded bore 29 in the output shaft 11 of the grinding machine.
In this embodiment of the invention there is illustrated a difference in axial levels between the inner contact surface 13 and the outer contact surface 14 of the support hub, a difference which is designated by the letter A. This differ
REFERENCES:
patent: 820474 (1906-05-01), Buchanan
patent: 1761859 (1928-01-01), Wilson et al.
patent: 3912411 (1975-10-01), Moffat
patent: 4655006 (1987-04-01), Block
patent: 5031361 (1991-07-01), MacKay, Jr.
patent: 5287659 (1994-02-01), Timmons et al.
Atlas Copco Tools AB
Eley Timothy V.
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