| 摘要 |
One end of a wrench is a first measurement system, such as SAE, and the second end is another measurement system, such as metric, that is close in size to the first end. It is possible to know approximately the correct size wrench needed but not the measurement system. Having two measurement systems in a single tool allows a user to pick a single wrench and have a high probability that one end of the wrench will correctly fit the nut or bolt. The end may be any type of socket, such as open ended or box ended, and the box end may be supplied with a ratchet mechanism. The combination of a first measurement system and a second measurement system on each end, close in size to one another, the ratcheting box end and the ability to reverse the ratchet action direction greatly reduces time and effort in the removal and tightening of bolts and nuts.
|
