Metal deforming – By use of tool acting during relative rotation between tool... – With cutting of work or product
Patent
1981-09-24
1983-11-08
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
With cutting of work or product
72112, 72120, 72125, 29157T, B21D 5140
Patent
active
044134851
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a flange forming drill means for drilling a hole through the side of a pipe or the like and for forming a flange, which encircles the hole. The drill includes a drill rod which is adapted to be mounted on a rotating power source and provided with a drill bit at the lower end. Flange forming members are mounted on the drill and after the hole has been drilled, the members are extended down below the edges of the hole by turning an adjustment member that is rotatably mounted on the drill rod for retracting and extending the members.
One such flange forming drill means is disclosed in U.S. Pat. No. 3,592,038, and that apparatus has proven itself very useful when a flanged hole is to be formed in the side of pipe e.g. for the connection of a branch pipe. For locking the flange forming members in place, either in an extended flange forming position or in a retracted or hole drilling position, it is necessary that a rotating adjustment member be secured or locked in various angular positions around the drilling axis. For this purpose the Finnish Patent Publication No. 50843 discloses a locking system, which is manually pressed in a radial direction to release the lock and permit manual rotation of the adjustment member. However, such a device is inconvenient to use because one hand must perform two simultaneous crosswise actuating movements, namely pressing the lock in radial direction while turning an adjustment cone 90.degree.. In addition to this inconvenience, the lock member and top ends of the forming pins produce a safety risk, because they project outwardly of an adjustment cone and rotate therewith. There is also another apparent safety risk, namely a possibility of injuring the fingers in the forming pins or the lock, while the adjustment cone is being gripped for the adjustment, and injury could occur if electrical current is accidentally switched on to start the drill. The risk also exists if the adjustment cone is gripped during so-called post-running of the drill.
OBJECT OF THE INVENTION
An object of the invention is to provide an improved drill means, so that the above mentioned operating trouble and safety risks are overcome.
BRIEF SUMMARY OF THE INVENTION
The foregoing object of the invention is accomplished in an illustrated embodiment characterized in that an adjustment member is externally enclosed in a smooth protective shield which is engaged to rotate the adjustment member, so that the member and shield rotate together around the drilling axis. Also, a drill rod is fitted with a locking member and the shield and adjustment member are removably locked in various angular positions around the drilling axis with respect to the drill rod.
The lock can be released by lifting the shield upwards on the drill rod, and this can be achieved automatically by contact with stop elements secured to the frame of the drill. The frame includes support legs which engage the work piece, and after a drilling operation, the drill means is pressed further downwards until the stop elements on the legs are engaged against the lower surface of the protective shield thus lifting the shield upwards on the drill rod. The friction force acting between the stop elements and the shield causes rotation of the shield and the adjustment member on the drill rod resulting in the extension of flange forming members down below the edges of the hole. Thereafter, as the drill rod is retracted upwardly while the flange forming members are extended, an upstanding flange is formed around the edge of the drilled hole.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the invention is described in more detail in the following specification and with reference to the accompanying drawings, in which:
FIG. 1 shows a flange forming drill means in accordance with the invention in a vertical cross sectional view;
FIG. 2 is a plan view of a locking flange in accordance with the invention; and
FIG. 3 is a sectional view taken along the line III--III of FIG. 1.
D
REFERENCES:
patent: 3592038 (1971-07-01), Larikka
patent: 3714808 (1973-02-01), Larikka
patent: 3844149 (1974-10-01), Hansen
patent: 3884060 (1975-05-01), Larikka
G. A. Serlachius Oy
Larson Lowell A.
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