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US 4,727,685 AGranted
Portable power file and belt tensioning arrangement therefor
AssigneeBlack & Decker Inc.
InventorDennis M. Batt
Life of this patent
Estimating the term…
Abstract
A hand-held powered file has an arm assembly carrying a pulley around which passes an abrasive belt. The arm assembly is urged into a position tensioning the belt by a spring. A control knob has a cam track which cooperates with a follower to relieve the tension exerted on the belt by the spring by moving the assembly rearwardly against the spring.
Claims14
A portable power file, comprising:
- a housing;
- an electric motor mounted in said housing;
- an arm assembly extending forwardly from said housing;
- a drive pulley mounted in said housing and connected to said motor for rotation thereby;
- an idler pulley rotatably mounted on a forward end of said arm assembly and spaced forwardly a distance from said drive pulley;
- an abrasive belt trained around said drive and idler pulleys;
- a rear end of said arm assembly comprising a hollow tube which is slidably mounted in a guide supported in said housing;
- a spring located inside said hollow tube and resiliently urging said arm assembly forwardly for tensioning said belt;
- a manually rotatable control member carrying a cam having therein a cam track;
- and
- a cam follower connected to said arm assembly and engaged in said cam track, rotation of said control member adjustably sliding said hollow tube in said guide to limit forward movement of said arm assembly by said spring.
8 more elements
Dependencies are inferred from the claim text.