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Method for assembling and electrical connector assembly for a power tool
| Details |
Inventors: Zeiler, Jeffrey M.; Hessenberger, Jeffrey C.;
Assignee: Milwaukee Electric Tool Corporation (Brookfield, WI)
Primary Examiner: Mullins; Burton S.
Assistant Examiner:
Attorney, Agent or Firm: Michael Best & Friedrich LLP
An electrical connector assembly for a power tool, a power tool and methods for assembling a power tool. A one-piece trace or spider terminal member assembly provides points of connection for the motor components, such as the field windings, the brushes and the switch. To assemble the motor, the terminal member assembly is positioned in the motor housing. To mount the terminal member assembly, the terminal member assembly is preferably co-molded with the housing or, alternatively, may snap-fit into connectors formed on the housing. The terminal member assembly and the housing are then preferably punched or stamped at points to provide the necessary number of electrically separated contact elements to connect the components of the motor. For example, the female ends or terminals of the field windings, the brushes and the switch are connected to the electrically separated contact elements to provide a suitable complete electrical circuit for the motor. Non-conducting members are positioned between adjacent ones of the electrically separated contact elements. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A terminal member assembly 10 embodying the invention and for use in a power tool 14 is illustrated in the Figures.
In the illustrated construction (see FIGS.
2 and 3A), the power tool 14 is a circular saw (partially shown).
It should be understood that, in other constructions (not shown), the power tool may be any type of electric power tool, such as a grinder, a drill or another type of saw.
The power tool 14 includes (see FIGS.
2, 3A and 5) a motor housing 18 and an operator's handle 20, which may be formed with or separately from the housing 18 (as shown in FIG.
3A).
The housing 18 is formed of a non-conductive, moldable material and has an open forward end and a generally closed rearward end.
A bearing member 22 is formed in the closed end of the housing 18.
As best shown in FIG.
5, a pair of circumferentially-spaced apart openings 23 are formed adjacent the bearing member 22, and a pair of axially-extending slots 24 are defined adjacent each opening 23.
The purpose for the bearing member 22, the openings 23 and the slots 24 is explained below in more detail.
The power tool 14 also includes (see FIGS.
2, 3A and 3B) an electric motor 26 which is connectable to a power source (not shown) by an electrical circuit and operable to drive a tool element, such as a saw blade (not shown), to work on a workpiece (not shown).
For purposes of illustration, components of the motor 26 which are electrically connectable to one another are identified by the same italicized letter (a, b, c or d).
In the illustrated construction (see FIGS.
2 and 3B), the motor 26 includes a field assembly 30 having one or more field windings 32 and 33.
The field assembly 30 includes a plurality of field terminals 34a-d for electrically connecting the field windings 32 and 33 in the electrical circuit for the motor 26.
In the illustrated construction, the motor 26 also includes a pair of carbon brush assemblies 38b and 38c.
Each brush assembly 38 includes a brush housing 40 having a pair of projections 41 formed thereon and slidably housing a carbon brush 42
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