AU2002100195A4 - Preset monotorque socket drive - Google Patents

Description

COMPLETE SPECIFICATION INNOVATION PATIENT PRESET MONOTORQUE SOCKET DRIVE P.M.S.D.

The following statement is a full description of this invention, including the best method of performing it known to me: 1 PRESET MONOTORQUE SOCKET DRIVE

P.M.S.D.

The following statement is a full description of this innovation, including the best method of performing it known to me: This innovation relates to revolution in the way of tightening any bolt, nut or screw in automotive applications or any other application.

Because tightening bolts and nuts with a classic torque wrench is the ideal and best secure way particularly in automotive and other applications. As tightening randomly without a torque wrench in many cases causes serious technical problems. However, the classic torque wrench has the following disadvantages: 1) The high price for most brands 2) It can't be used in confined places easily 3) Sometimes the confusion of using the scale would cause technical problems 4) It needs in some cases a certain technical skill level to handle it It may be used in a workshop for just one or two torque settings for every day, week or month and that means it's not to the optimum efficiency, which is a waste of money 6) The torque wrench cannot check the torque of already tightened bolt or nut 7) If two or three persons need to use the torque wrench in the workshop at the same time, they have to wait for each other or buy more expensive torque wrenches 8) Since it is an expensive tool, it needs a lot of care in handling and storage 9) Over tightening with the torque wrench can happen The Preset Monotorque Socket Drive (PMSD) is the very practical solution to the problems mentioned above. So it is very practical when requiring one repetitive one torque setting like tightening torque for spark plugs in automotive applications. The usage of this innovation in this case is by attaching the spark plug tightening socket to one end and the tightening bar with extension to the other end. When tightening the spark plug, the tightening bar slips in the hand a number of angular degrees upon reaching the torque or the preset torque of the innovated device.

This device can evaluate the previously tightening torque of any bolt, nut or spark plug by using it in undoing action to check whether the bolt, nut or spark plug was over or under tightened. If the tightening bar slips before the bolt, nut or spark plug moves, that means that they were over tightened and if the bolt, nut or spark plug is undone before the tightening bar slips, that means they were under tightened. To check the tightening torque exactly, more that one device with different torque settings would be used.

This innovation (Fig 1) looks in general like a cylinder adaptor with male square drive 3/8", 12,"or on one side where the tightening socket is attached to it and on the other side a female square drive ,"or where extension rod and/or tightening bar attached and this end is hexagonal from outside to suit ring or open wrenches which is an advantage against the classic torque wrench. This innovation has overcome the disadvantages of the classic torque wrench mentioned above and in this case would be considered an advantage for the new design.

The innovation (Fig 2) is comprised of 10 parts mostly manufactured from hard steel are as follows: The outer cylindrical body of the device contains the guts of the device, and is used to display on its outer surface the torque setting of this unit. This part has internal thread from one side and 2 circular hole from the other side. The male square drive is attached to part by its threaded end from outside. This thread arrangement is used for assembling the device and for adjusting the torque setting accurately in the manufacturing process. After this adjustment, both parts are arc welded together by four welding stitches 900 apart between each other and used as a locking way. The other side of part is a female bevel and its surface is hardened and precisely finished.

Part of this unit has a male bevel end and its surface is hardened and precisely finished too. The bigger end of the bevel contains a shoulder where a needle thrust-bearing sits. The other end of part is a female square and from outside, hexagonal with a size that suits the size of the female square drive. The male bevel end has exactly the bevel angle of the female bevel surface of part and it will skid on surface of part and slips a number of degrees at the moment reaching the preset torque of the device. A coil spring with a specific stiffness for the device is used to be compressed between the inner shoulder of part and the outer shoulder of part This spring is just touching the inner surface of part and not touching the outer surface of part The spring is seated on the thrust bearing to enable part to rotate freely relative to the spring upon reaching the preset torque. Both outer cylindrical surfaces of the beveled end of part and the inner surface of part are hardened and precisely finished and have a precise sliding tolerance between each other. A dust boot is fitted to the female square drive end and has got a light sponge cushion ring to prevent dust entering the device without affecting the preset torque setting. The stiffness of the spring is changed by adding or removing adjusting shims fitted between the spring and part shoulder.