ANSI B175.4 pdf free download
ANSI B175.4 pdf free download.Outdoor Power Equipment一 Portable, Handheld, Internal Combustion Engine- Powered Cut-Off Machines一 Safety and Environmental Requirements.
4.3. Engine stopping device
The engine shall be fitted with an on/off or stop control, which brings it to a final stop and does not depend on sustained manual effort for its operation. This device shall be positioned so that it can be operated while the machine is being held with both hands by the operator wearing protective gloves. The purpose and method of operation of the device shall be marked clearly and durably. The color of the stopping device shall clearly contrast with the background.
4.4. Throttle control and lockout
The cut-off machine shall be equipped with a continuous-pressure throttle control system that will discontinue the power to the cut-off wheel when pressure is released.
4.4.1. Requirements
A throttle control lockout shall be provided, and it shall be constructed so that it must be actuated before the throttle control can be activated. When the throttle control system is locked out, the throttle control valve shall be in the idle position unless a throttle control latch is engaged (for starting). The throttle control lockout shall not prevent the engine from returning to idle speed.
The cutting wheel shall not engage or move when a force is applied to the throttle control without releasing the throttle control lockout.
4.4.2. Test Procedure
The throttle control lockout function shall be verified by applying a force equal to 50 N ±2 N
(11.24 lbf ± 0.45 lbf) or half the dry weight of the machine (without accessories and/or cut-off
wheel), whichever is higher, on the throttle control with the throttle control lockout engaged.
Dunng the test the handle shall be fixed and shall not contact the throttle control lockout.
The force shall be applied gradually to the throttle control in the direction of travel and held for
5 s ± 1 s. The force shall be applied 12.5 mm (0.5 in) from the rear of the throttle control.
A throttle control linkage shall be designed so that a force equal to three times the machine dry weight (without accessories and/or cut-off wheel) applied in any direction to the rear handle shall not increase the engine speed to a point where the clutch engages and the cut-off wheel movement begins.
4.5. Clutch
The cut-off machine shall have a clutch so designed that the abrasive cut-off wheel does not move when the engine rotates at any speed less than 1.25 times the idle speed specified in the operator’s manual.
4.6. Engine Exhaust
4.6.1. Exhaust direction
The exhaust shall be directed away from the machine and away from the operator when operating the machine in the operating/cutting position shown in Figure 3.
4.6.2 Spark arresting mufflers
If cut-off machines are equipped with or have provisions for spark arresting mufflers, the spark arrester and spark arresting muffler shall meet the specifications and performance requirements in USDA FS 5100-1.
4.7. Cutting debris discharge
The machine shall be designed so that the main stream of cutting debris from the cut-off wheel
is not directed towards the operator’s face or upper body in the cutting positions as described in
Figure 3 and in the operator’s manual.
4.8. Fuel tanks, oil tanks and fuel feed lines
4.8.1. Tank filler location and identification
The fuel tank filler opening, and if provided, the oil tank filler opening, shall be located so that access to the filler opening(s) is not unduly obstructed by other cut-off machine components. Each cap or opening shall be clearly and durably identified. If only the caps are identified, they shall not be interchangeable.
ANSI B175.4 pdf free download.
