What are the parts of a bypass lopper?

29th February 2020

What are the parts of a bypass lopper?


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		Bypass lopper blades
		The blades are the part of a bypass lopper which is used to cut through branches. One blade is sharpened to a fine edge, while the other is ground flat to provide a blunt edge.

		The sharp blade presses the branch being cut down on the unsharpened blade, which provides resistance. This makes cutting through tough plant matter smoother and easier.

		Bypass lopper centre oiler bolt
		A centre oiler bolt is a specialist type of bolt used to fasten together the hinged blades of cutting tools. A centre oiler bolt allows the user to oil the joint precisely at the required point, without making the rest of the tool greasy.

		Using a thin-nozzled bottle or syringe to press down on a spring-loaded ‘oiler’ (similar to a ball-bearing) in either the head or base of the bolt, oil is fed directly into the inside of the bolt.

		The oil is then dispersed into the hinge of the jaw via small holes in either side of the bolt’s shank.

		Bypass lopper buffers
		Most bypass loppers feature a pair of rubber buffers between the two arms, which absorb the impact of cuts.

		When cutting through tough, dry wood, it is possible that the blades may close suddenly and abruptly once the tough outer bark is cut. In this case, it is important that the impact is buffered to prevent jarring to the wrists, and damage to the lopper handles.

		Bypass lopper arm bolts
		The arm bolts on a bypass lopper are used to fasten the cutting blades to the handles tightly. A simple bolt, washer and nut are used as standard. The number of arm bolts may vary depending on the design.

		Bypass lopper handles
		The handles are the part of the bypass lopper that the user holds, and are used to open and close the blades.

		Each handle is attached to the corresponding blade, and pivots about the centre oiler bolt, so that when the handles are opened, the blades part, and when the handles are closed, the blades close.

		In a closed position, the cutting edge of the sharp blade sits below the flat edge of the unsharpened blade; when the handles are opened, the sharp blade pivots upward, bringing the cutting edge of the sharp blade into position above the flat, curved edge of the unsharpened blade.

		Bypass lopper handle grips
		Each of the handles on a lopper incorporates a moulded handle grip. This is manufactured from rubber, and moulded to provide ergonomic grip and comfort during use, while further absorbing the impact generated by cutting branches.