The art used in the design of this pneumatic air ratchet wrench is inspired by the rotary impact wrenches. The rotation of the output shaft in this pneumatic air ratchet wrench is reciprocated periodically into and out from the rotary impact. The torque of the output shaft is controlled with the help of a reverse switch in the air motor.
The idea of the pneumatic air ratchet wrench originated from the impact wrench. The air motor [4] is also called the pneumatic motor which is used in different mechanical work. The air motors convert the air energy into the mechanical energy which is used to rotate the output shaft of the wrench. The air motors are usually used in the handheld tools which are used at various locations that need the ease of the handling. The air motors are also used in the pulse tools, the impact wrenches, nut runners, grinders, screwdrivers. Hence the air motors or the pneumatic motors are extensively used for various handheld tools. In the developed model the same air motor or the pneumatic motor is used. This type of wrench is also cordless or the electric wrench which is operated with the help of the electric power in form of the air pressure. A battery can be also used to operate the electric motor but in this design the motor will be the air motor which is operated with the difference of the air pressure in the wrench. A good pilot arrangement is required in the design of the newly developed model in order to effectively control the motor. This wrench will work on the air pressure inside the wrench body. That is why the body for this type of wrench is airtight in order to effectively provide the enough air pressure to operate the wrench designed.
The prior importance while designing the pneumatic air ratchet wrench was to keep the weight of the wrench as light as possible. For this purpose, the components with the lighter weight were used. The other important aspect kept in mind was the inertia. When the device is triggered the inertia is created among the parts of the wrench which is handled with the help of the casing of the developed model. The housing of the developed model includes the air motor and the other mechanical parts of the wrench. The proper casing for the air motor was developed in order to reduce the inertia experienced by the user. The different available casings for the pneumatic air ratchet wrench were studied and the new design was made to improve the different parameters from the previous models.
The head for this wrench will be changeable. The changeable heads for the air ratchet wrench allow to use the heads with the different sizes to tighten or loosen the different kind and types of the screws. In different hardware or tool, the standard bolt sizes and the standard screw sizes are used. The heads for the different standard sizes of the bolts and screws will be easily attachable to the designed wrench. The easy attachment of a new wrench head allows the user to attach or detach a head of desired bolt or screw size easily. The standard sizes of the heads for the bolts and screws will be used.
In the housing of this wrench, air motor and the other mechanical parts are included. To minimize the level of inertia, the proper casing for the air motor was developed. The different available casings for the pneumatic air ratchet wrench were studied and the new design was made to improve the different parameters from the previous models. This wrench also has a changeable head, which allows to use the heads with the different sizes to tighten or loosen the different bolts. In the professional working, the standard and metric bolt sizes are used. The heads for the different standard sizes of the bolts and screws will be easily attachable to the designed wrench. There is also an option of extra-attachments, by this concept the head of the wrench can be changed according to the desired bolt size.
This latest wrench, equipped with the battery, is generally used to assemble, or disassemble several hardware components with ease. This particular model of the wrench comparatively has many of the advanced features. By these features the time of the user can be saved, the quality work can be done and most importantly the safety of the user can be insured. That's why this item has novelty. A cordless ratchet wrench is designed with the various upgrades in its design from the previously available cordless ratchet wrench. The ratchet actuator is used in the newly developed design of the cordless ratchet wrench. The ratchet motor [4] was used to control the direction of the output shaft. With the help of the ratchet actuator, which was a motor, the direction for the rotation of the output shaft was easily adjusted. This newly developed technique is used to hold different rotating heads [1] for usage. The desired tool or the hardware like the nut or bolt can be easily tightened or loosed with the help of the ratchet actuator. The ratcheting motion of the developed ratchet wrench is easily controlled. A battery was used in the new design to provide the power for the rotation of the shaft for tightening and losing purpose. The power and capacity of the battery were used to rotate the ratchet which can be varied with the increasing size or the capacity of the battery. The newly developed model of the cordless ratchet wrench is easy to use with the increased performance as compared to the available models of the ratchet wrench. The push-button was used to trigger the rotation of the shaft for the tightening or the losing purpose of the attached hardware. The battery also prevents the reverse flow of the rotating shaft in case of the torque experienced in the wrench. The motor used in the developed model for the ratchet wrench also provides the positive driving surface force in case of the torque exerted on the object while the rotation of the output shaft. The battery used in the design is the lithium battery which can be recharged. The terminals for the charging of the battery are marked to identify the charging port.
They are basically the changeable heads, that can be used according to the different hardware components. These heads are also known as flexible heads, their shape and the size of the head depends upon the size of the bolt. In the older times, there was no concept of changeable heads. If there is a bolt having a different size, then the head of the wrench can be easily changed for the ease of working. The head is usually connected at the upper side of top head assembly. At top head assembly, all the upper components and the body is connected. The material used for the construction of removable heads is same, but there are several kinds of the removable heads, that depend upon the requirements of the work.
[1] “A New Ratchet-Wrench,” Scientific American, vol. 83, no. 2, pp. 388-388, 1900.
[2] G. H. Ander, “Screw-driver Wrench and Tap Wrench,” Scientific American, vol. 105, no. 20, pp. 433-455, November 2011.
[3] J. T. Warner, “Lithium ion Battery operation,” Lithium-Ion Battery Chemistries. Pp. 43-77, 2019.
[4] J. F. W. Schnorr, “Design of a High Temperature Air Motor,” January 1978.