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The Most Comprehensive Guard Available
- Patented 180° design helps to protect personnel from the pinch point and catches the roll if it should fall from the return bracket
- Patented solid UHMW slotted cage is durable, safe, helps prevent material build-up and is relatively maintenance free
- Can be used with CEMA B, C, D & E idlers
- Universal slotted steel mounting brackets are simple to install, retrofi t to most CEMA return idler bolt patterns and are engineered to work with 4”, 5” & 6” idlers and will accommodate 1-1/2” and 4-1/2” drop brackets
- Can be used with most other idler manufacturers’ return rolls
- Optional end cap available
- Comes complete with safety warning labels, easy three step mounting instructions and special patented mounting brackets
- Corrosion & impact resistant polymer cage for long life
- Light weight for quicker and easier installation
- High visibility yellow cage
The Second Generation Guardian Premium Return Roll Guard
- Lower Cost
- Solid UHMW Construction
General Arrangement and Location of the Guardian™

Enhanced Guardian Return™ Roller
MODEL NO. |
BELT WIDTH |
WT. |
A |
B |
C |
MOUNTING BOLT |
RRG-18U |
18 |
5.6 |
27 |
21 5/16 |
29 |
1/2 |
RRG-20U |
20 |
5.8 |
29 |
23 5/16 |
31 |
1/2 |
RRG-24U |
24 |
6.0 |
33 |
27 5/16 |
35 |
1/2 |
RRG-30U |
30 |
6.5 |
39 |
33 5/16 |
41 |
1/2 |
RRG-36U |
36 |
6.8 |
45 |
39 5/16 |
47 |
1/2 |
RRG-42U |
42 |
7.3 |
51 |
45 5/16 |
53 |
1/2 |
RRG-48U |
48 |
7.6 |
57 |
51 5/16 |
59 |
1/2 |
RRG-54U |
54 |
8.1 |
63 |
57 5/16 |
66 |
1/2 |
IMPORTANT: Designed to be installed with a 1/8 inch gap between the guard and the belt. ALWAYS FOLLOW OSHA, STATE AND OWNER REQUIRED SAFETY GUIDELINES/REGULATIONS DURING THE INSTALLATION OR OPERATION OF A CONVEYOR SYSTEM. Douglas Manufacturing Co., Inc. strongly recommends that any safety program be supplemented by the use of ANSI B20 that refers to conveyor systems. Never operate, adjust or install equipment on a moving conveyor. Always follow lock out and tag out procedures when working on conveyor systems. Personnel who work on or around conveyor systems must be safety trained and familiar with conveyor systems.
The Guardian™ must be inspected periodically to determine if the unit is in proper working order by inspecting and replacing the urethane seal, inspecting to see if material build-up has occurred and ensuring proper adjustment and tightness of all adjustable bolts. Failure to do so may result in serious injury or death. No idler guard can protect against potential danger in all situations or against all hazards. The Guardian™ is designed to help minimize the potential for danger but cannot guarantee protection in all situations or applications. If you have questions or need assistance please call 205-884-1200 or fax 205-884-1206.
The Guardian™ is a trademark of Douglas Mfg. Co., Inc. All Rights Reserved.
The Guardian™ Patent No. 6,318,545.
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