Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1995-08-07
1997-12-30
Eley, Timothy V.
Metal working
Method of mechanical manufacture
Assembling or joining
29514, 29788, 29796, 29233, 292435, 72172, 72179, 188251R, B21D 5334, F16D 6508
Patent
active
057016550
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to brake shoes and in particular to a method and apparatus for producing arcuate brake shoes.
It is an object of the present invention to provide a low cost method for the manufacture of arcuate brake shoes which is particularly suitable for the manufacture of the long arcuate shoes used in single shoe brakes.
SUMMARY OF THE INVENTION
Thus according to the present invention there is provided a method of producing an arcuate brake shoe comprising the steps of taking a first strip of material which is to provide a web of the shoe and has a plurality of projections extending from one edge, taking a second strip which has a plurality of corresponding openings to receive the projections and which is to provide the platform of the shoe, securing the strips together with projections and openings engaged and forming the strips longitudinally to an arcuate form.
Preferably the method comprises securing and forming the strips by passing the strips through a roller arrangement. This roller arrangement preferably comprises a central roller and a number of satellite rollers circumferentially spaced around and co-acting with the central roller.
The central roller is preferably grooved circumferentially to receive the first strip standing on its other edge with the projections extending radially outwardly from the central roller.
The central roller may be split in two portions in a plane transverse to its axis of rotation and the first strip is received on its other edge in a groove formed between the roller portions.
A first satellite roller deforms the projections on the first strip as they appear through the corresponding openings in the second strip to secure the strips together and the subsequent satellite rollers deform the projections further till the projections are flush with the surface of the second strip.
The first strip is positively located relative to the central roller during the securing and forming of the two strips by a locating formation on the central roller which passes through an aperture in an end portion of the first strip.
The strips are preferably automatically assembled by manipulators which locate the first strip on its other edge in a guide track which feeds the roller arrangement and which locate the second strip on the first strip so that the projections and openings can engage prior to entry into the roller arrangement.
The method of the present invention is particularly suitable for the production of arcuate brake shoes for use in single shoe brakes. Such shoes are almost a complete circle and are operated by a brake actuator which is in the gap between the opposed ends of the shoe.
The method of the present invention is also suitable for the manufacture of conventional brake shoes for use in any conventional twin shoe brake.
The present invention also provides an apparatus for the production of an arcuate brake shoe from a first strip of material which is to provide a web of the shoe and has a plurality of projections extending from one edge and a second strip which has a plurality of corresponding openings to receive the projections and which is to provide the platform of the shoe, said apparatus comprising means securing the strips together with projections and openings engaged and for forming the strips longitudinally to arcuate form.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described, by way of example only, with reference to the accompanying drawings in which:
FIG. 1 is a diagrammatic view of an apparatus in accordance with the present invention for producing an arcuate brake shoe;
FIGS. 2, 3, 4 and 5 are cross sectional views taken on lines 2--2, 3--3, 4--4, and 5--5 of FIG. 1 respectively;
FIGS. 6 and 7 show side and plan views respectively of first and second steel strips used in the apparatus of FIGS. 1 to 5, and
FIG. 8 shows a diagrammatic side view of an arcuate brake shoe manufactured in the apparatus of FIGS. 1 to 5.
DESCRIPTION OF PREFERRED EMBODIMENTS
Referring to FIG. 1 the brake shoe manu
REFERENCES:
patent: 3540395 (1970-11-01), Skinner
patent: 4531276 (1985-07-01), Warwick et al.
patent: 4688414 (1987-08-01), Mugica
patent: 5440796 (1995-08-01), Deggau et al.
Automotive Products plc
Eley Timothy V.
Germain Lee A.
Milliken Paul E.
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