Metal deforming – By relatively receding work-engaging tool-faces – Embodying three or more tools
Patent
1981-03-27
1984-01-17
Larson, Lowell A.
Metal deforming
By relatively receding work-engaging tool-faces
Embodying three or more tools
72409, 72452, B21D 4102
Patent
active
044257830
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a tube expanding tool and in particular it relates to a tool of the type in which a series of radially expanding jaws are carried by a head fitted to a body which has on it handles whereby a drift can be manipulated to expand the jaws when the jaws are engaged on the tube which is to be expanded.
It is already known to construct tube expanding tools of this general nature and for instance according to an earlier tool, a body had on it a handle which projected therefrom and had hinged thereto another handle which had on it a cam face which engaged a drift axially slidable in the body, which drift was moved into expanding jaws carried on a head which was engageable on the body. By manipulating that handle which has the cam face on it the drift was forced inwards to expand the jaws.
In the earlier devices certain problems occurred because of the amount of expansion generally required and the relatively heavy force necessary to move the drift against the friction exerted on its tapered part by the jaws, which jaws require considerable radial force on them to xpand the tube.
Because of his it has been proposed according to an earlier invention to have the pivot of the handle, which has on it the cam face, movable along the axial line of the drift so that a first pressure moved the drift part way along its forward travel, after which the pivotal axis of the lever was moved forward and the drift moved forward further along its forward travel when the lever was actuated again.
The object of the invention is to provide a tool which does not necessarily require a multi-stage operation and in which certain other advantages will result, as will be apparent from the following description.
The tube expanding tool according to the present invention comprises a body having a first handle secured thereto and a second handle pivotally carried thereby, and a drift axially slidable therein into expandable jaws carried in a head mountable on the body, whereby to expand the jaws when the drift is moved thereinto, the invention being characterised by a push rod hingedly connected to the drift about an axis parallel to the axis of movement of the movable handle and positioned to engage a cam face on the movable handle in a position on or ner to the axis of movement of the drift.
The invention can be conveniently carried out by using a push rod hinged to the rear of the drift which has an arcuate face on it which engages a cam face on the inner end of the pivoted handle on or adjacent to the axis of movement of the drift, the handle preferably being mounted in such a way that at the commencement of the forward stroke of the drift that part of the face of the push rod which engages the cam face on the movable handle is on the pivotal axis of the handle.
In order however that the nature of the invention can be fully appreciated an embodiment thereof will now be described with reference to the accompanying drawings in which:
FIG. 1 is a perspective view of a tube expanding tool constructed according to this invention,
FIG. 2 is a transverse section of same on the plane of line 2 on FIG. 1,
FIG. 3 is a fragmentary transverse section of same on the plane of line 2 of FIG. 1,
FIG. 4 is a sectional enlarged fragmentary view of the articulation joint between the drift and the push rod,
FIG. 5 is an enlarged fragmentarily sectioned side elevation of the tube expanding tool,
FIG. 6 is a longitudinally sectioned view of the body showing the drift and the push rod and cam and handle assembly, the drift being shown in retracted position, and
FIG. 7 is a similar view but with the drift in its advanced position.
The body 1 has on it a fixed handle 3, and includes two rearwardly projecting wings 4 and 5 which form support means for a second handle.
Engaged on this body by means of a screw thread 7 is a head 8 which supports on it a series of jaws 9 in any usual or approved manner, the jaws extending through an aperture in a keepr 10 which forms one part of the head 8 and which is engaged on a ring 11 which forms a second
REFERENCES:
patent: 291775 (1884-01-01), Rice
patent: 2999529 (1961-09-01), Rast
patent: 4164135 (1979-08-01), Clavin
Adams Bruce L.
Burns Robert E.
Larson Lowell A.
Lobato Emmanuel J.
Ridge Tool Company
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