Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1987-10-07
1989-08-01
Watson, Robert C.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
B23P 1904
Patent
active
048522341
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention relates to a puller assembly particularly envisaged for use in pulling bearings from shafts or as a clamp or the like.
The puller assembly of the present invention will hereinafter be described with particular reference to a bearing puller although it is to be understood that it is of general applicability.
FIELD OF THE INVENTION
In general, bearing pullers comprise two or three legs pivotally mounted on a base and arranged to locate about the perimeter of a pulley on a shaft and a drive bolt arranged centrally of the legs and threadedly engaged with the base. The drive bolt is, in use, rested against an end of the shaft having the bearing fitted onto it. The drive bolt is disposed axially in line with the shaft. The drive bolt is then rotated such as with a shifter to threadedly propagate through the base and draw the legs toward the end of the shaft. Consequently the bearing is pulled along the shaft toward the same end.
In such an apparatus the shifter is rotated in a plane normal to the axis of the shaft and since there is friction between the drive bolt and the shaft torque applied to the drive bolt by the shifter is transmitted to the shaft. Where the shaft is an axle it tends to rotate and so it is necessary to immobilize the axle so that the puller will operate. To immobilize the axle often requires the help of another person.
When the shaft is prevented from rotation the drive bolt rotates on the shaft end subject to the said friction and in accordance with the applied torque. Rotation of the drive bolt with respect to the end of the shaft in such prior art puller assemblies is essential in drawing the legs toward the end of the shaft. It is common for such frictional rotation to damage the end of the shaft either by slipping off the end or by deforming a detent provided in the shaft end for centering purposes. The mechanical advantage available with such prior art bearing pullers is limited to the length of the shifter and the restraining force that can be applied to the shaft, where the shaft is subject to rotation.
SUMMARY OF THE INVENTION
The present invention provides a puller assembly in which the drive bolt is not required to rotate with respect to the end of a shaft from which a bearing or the like is to be removed.
In accordance with the present invention there is provided a puller assembly characterised in that it comprises at least two angled brackets each pivotally secured at a first end to a base, each of the angled brackets having a second end remote from the first end and disposed oppositely with respect to the base, a screw means threadedly engaged with the second ends and disposed so as to allow adjustment of the distance between the second ends, a drive bolt threadedly engaged in the base centrally of the angled brackets and a leg pivotally fixed to a respective one of the angled brackets and disposed to attach to an object to be pulled.
Preferably each of the first ends of the angled brackets comprises a cog disposed to engage a cog of an adjacent angled bracket.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described, by way of example, with particular reference to the accompanying drawings, in which:
FIG. 1 is a side view of a puller assembly in accordance with a first embodiment of the present invention;
FIG. 2 is an end view of the puller assembly of FIG. 1;
FIG. 3 is a side view of a puller assembly in accordance with a second embodiment of the present invention; and
FIG. 4 is an end view of the puller assembly of FIG. 3.
DESCRIPTION OF THE INVENTION
In FIG. 1 there is shown a puller assembly 10 comprising two angled brackets 12 each having a first end 14 and a second end 16 remotely located from the first end. The brackets 12 are pivotally secured to a base 18 at the first end 14. The base 18 comprises a centrally located threaded hole (not shown) arranged to be threadedly engaged by a drive bolt 20.
The second ends 16 are disposed oppositely with respect to the base 18 as shown in FIG. 1. Each of the sec
REFERENCES:
patent: 1890369 (1932-12-01), Cook
patent: 2052304 (1936-08-01), Kaplan
672,390, United Kingdom.
Haben Corporation Ltd.
Hale John S.
Watson Robert C.
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