# US 5,345,850 A · Belt tensioning device for band saws

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- Number: US 5,345,850 A
- Document ID: US5345850A
- Status: Granted
- Kind: A
- Application number: 08/101,291
- Filed: 1993-08-09
- Granted: 1994-09-13
- Earliest claimed: 1993-08-09
- Assignees: S-B Power Tool Company
- Inventors: Roger D. Neitzell
- Web page: https://patentgrep.com/patent/US5345850A

## CPC

- B26D 1/48: with tensioning means
- Y10T 83/707: By endless band or chain knife
- Y10T 83/7226: With means to guard the tension
- B26D: CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING (for growing crops or plants A01D, A01G; for fodder or straw A01F; for bulk butter A01J; for dough A21C; slaughtering A22B; for tobacco, cigars or cigarettes A24; marking-out, perforating or making buttonholes A41H25/00; manufacturing footwear A43D; brushmaking A46D; surgery A61B; disintegrating, mincing or shredding in general B02C; cutting wire, making pins or nails B21F, B21G; of the kind used formetal B23; cutting by abrasive fluid jets B24C5/02; hand-held cutting tools B26B; perforating, cutting-out, stamping-out or punching, or severing by means other than cutting B26F; for wood B27; for stone B28D; working of plastics or substances in a plastic state B29; making boxes, cartons, envelopes or bags, of paper or similarly worked materials, e.g. metal foil, B31B; article or web delivery apparatus incorporating cutting or line-perforating devices B65H35/00; for leather or upholstery B68, C14B; for glass C03B; making matches C06F; for peat C10F; for sugar C13B45/00; for textile materials D06H; civil engineering, building, mining, see Section E; for light guides G02B6/25; cutting processed photographic material G03D15/04)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A bandsaw assembly including an improved drive belt tensioning device which enables efficient manual engagement and disengagement from the drive belt through use of an overcenter bracket. The overcenter bracket includes a spring releasably holding the tensioning device out of engagement with the belt to permit the operator to use both hands during a belt changing operation.

## Claims

### Claim 1

A band saw assembly comprising:
a housing;
an upper and a lower spindle wheel each rotatably mounted on said housing and supporting an endless sawing band for movement about said spindle wheels in a vertical plane;
a driving shaft mounting at least one driving sprocket gear;
a driven shaft mounting one of said spindle wheels, said driven shaft mounting at least one driven sprocket gear;
at least one of said driving and driven shafts mounting plural ones of said sprocket gears of different diameters;
a drive belt engaged with selected ones of said driving and driven sprocket gears;
a bracket assembly pivotally mounted on the housing adjacent stop means and including a belt tensioning roller, said bracket assembly further including an overcenter biasing means connected to said bracket assembly and to said housing, thereby alternately and selectively maintaining said roller (a) in engagement with said drive belt so as to impart and maintain a tension in the drive belt and (b) in engagement with said stop means and in spaced relationship with the drive belt so as to facilitate training of the belt over selected ones of said sprocket gears.

### Claim 2 (depends on 1)

A band saw assembly according to claim 1, wherein said bracket assembly further includes a tab for manual engagement and disengagement of said roller with said belt.