公开(公告)号：EP1017543A1

公开(公告)日：2000-07-12

申请号：EP99935447.5

申请日：1999-07-08

申请人： Snap-On Tools Company

发明人： BECKER, Thomas, P.

IPC分类号： B25B23/142

CPC分类号： B25B23/1425

摘要： A ratcheting electronic torque wrench (10) has an input beam in the form of a hollow housing (11) with a handle end (29) and a work end (28), a ratchet head (30) disposed within the work end of the housing and rotatable relative thereto and a reaction beam (35) disposed within the housing and having one end fixed to the ratchet head for pivoting therewith about the axis thereof and input end (37) resiliently urged to a neutral position relative to the housing by two bias springs (40, 41) respectively engaging opposite sides of the reaction beam. A Hall-effect sensor (47) carried by the input end of the reaction beam is disposed between two permanent magnets (48a) and is powered by a battery (42) for producing an output indicative of reaction beam movement, which is proportional to applied torque. A display circuit (60) can display the applied torque or a predetermined torque level set by a preset circuit. An alarm signal (87) is generated when the applied torque reaches the predetermined level.

公开(公告)号：EP1017543B1

公开(公告)日：2011-01-26

申请号：EP99935447.5

申请日：1999-07-08

申请人： Snap-on Tools Company

发明人： BECKER, Thomas, P.

IPC分类号： B25B23/142

CPC分类号： B25B23/1425

摘要： A ratcheting electronic torque wrench (10) has an input beam in the form of a hollow housing (11) with a handle end (29) and a work end (28), a ratchet head (30) disposed within the work end of the housing and rotatable relative thereto and a reaction beam (35) disposed within the housing and having one end fixed to the ratchet head for pivoting therewith about the axis thereof and input end (37) resiliently urged to a neutral position relative to the housing by two bias springs (40, 41) respectively engaging opposite sides of the reaction beam. A Hall-effect sensor (47) carried by the input end of the reaction beam is disposed between two permanent magnets (48a) and is powered by a battery (42) for producing an output indicative of reaction beam movement, which is proportional to applied torque. A display circuit (60) can display the applied torque or a predetermined torque level set by a preset circuit. An alarm signal (87) is generated when the applied torque reaches the predetermined level.