Spur Gears - Norfolk Bearings and Supply Company, Inc.
Spur Gears - Norfolk Bearings and Supply Company, Inc.
Spur Gears - Norfolk Bearings and Supply Company, Inc.
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H<br />
Roller Chain Drive Tensioners<br />
Type LG<br />
Shaft Mounted<br />
F<br />
L<br />
Type BG<br />
Screw Adjustable<br />
G<br />
F<br />
MAX.<br />
B<br />
K<br />
B<br />
P<br />
G<br />
K<br />
2G<br />
H<br />
M<br />
A<br />
C A<br />
5/16"<br />
G<br />
E<br />
MAX.<br />
IDLER<br />
SHAFT<br />
1/4"<br />
GREASE<br />
FITTING GREASE<br />
D<br />
PORT<br />
COLLAR<br />
5/16"<br />
H<br />
E<br />
MAX.<br />
IDLER<br />
SHAFT<br />
1/4"<br />
GREASE<br />
FITTING D<br />
GREASE<br />
COLLAR PORT<br />
J<br />
L<br />
ADJUSTING SCREW<br />
C<br />
J<br />
This shaft-mounted tensioner is best suited for applications<br />
where it is impractical to bolt the tensioner on a frame. This<br />
tensioner can be mounted at any point on a shaft <strong>and</strong> is<br />
adjustable to any location in a 360° arc on the shaft.<br />
ORDER BY CATALOG NUMBER OR ITEM CODE<br />
Suggested Catalog Item<br />
Chain Number* Number Code<br />
35, 40, 41 0-LG 48888<br />
40, 50, 60 1-LG 48889<br />
80, 100, 120 2-LG 48890<br />
*Single-str<strong>and</strong> chain. For multiple str<strong>and</strong> chain, use larger tensioner.<br />
ALL DIMENSIONS IN INCHES<br />
Size A B C D E F G H J K L<br />
0-LG 4 7/8 3/4 .500 1 2-1/2 1-9/16 7/8 1/16 1-5/8 .500<br />
1-LG 6 1-1/4 1 .875 1-3/4 4 2-15/32 1-3/16 3/32 2-1/8 .875<br />
2-LG 8 1-1/2 1-1/4 1.125 2-7/8 5-1/2 3-21/32 1-3/8 1/8 2-3/4 1.125<br />
These Boston Gear tensioners use a screw for precise, easily<br />
adjustable tension, to provide maximum life for the sprocket<br />
<strong>and</strong> chain. These tensioners are useful on vertical drives to<br />
prevent lower sprocket disengagement <strong>and</strong> on heavy chains<br />
where slack is normally taken up by h<strong>and</strong>, while making the<br />
adjustment. With these tensioners chain take-up <strong>and</strong> tension<br />
are both controlled with the screw.<br />
Many drive systems are enclosed for safety reasons. With<br />
conventional tensioners, the enclosure must be removed for<br />
drive adjustment. With Boston tensioners adjustments can be<br />
made to the head of the screw, substantially reducing cost<br />
maintenance <strong>and</strong> drive down time. The screw is adjustable from<br />
either end of the tensioner.<br />
ORDER BY CATALOG NUMBER OR ITEM CODE<br />
Suggested Catalog Item<br />
Chain Number* Number Code<br />
35, 40, 41 0-BG 48878<br />
40, 50, 60 1-BG 48879<br />
80, 100, 120 2-BG 48880<br />
*Single-str<strong>and</strong> chain. For multiple str<strong>and</strong> chain, use larger tensioner.<br />
ALL DIMENSIONS IN INCHES<br />
Size A B C D E F G 2G H J K L M P Wgt.<br />
0-BG 5-7/8 1-1/2 5-1/4 .500 1 2-1/2 9/32 3/8 2-13/16 1-5/16 1-3/8 1-1/4 3/8 3/4 1 LB.<br />
1-BG 9 2 8-1/8 .875 1-3/4 4-1/2 11/32 1/2 4 1-5/8 1-3/4 1-1/2 1/2 1 2-1/2 LB.<br />
2-BG 13 3 11-7/8 1.125 2-7/8 6 9/16 3/4 5-11/16 2-5/32 2-7/8 2 5/8 1-1/2 6 LB.<br />
294 Boston Gear 800-825-6544 P-1930-BG 04/10
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