It will also be seen and understood that the two bearing races at each terminal axial end of the gear 32 are arcuate in the configuration which is in contact with the bearing balls, and the races are thereby oblique to the axis A, as best seen in FIG. That produces both axial and radial forces F 1 and F 2 , with F 2 being a reaction force, on the gear 32 when the axial space between the races is diminished by screw tightening at threads Thus any play, that is relative movement, at the gear 32 is restricted, as desired.
For ratcheting action, two pawls 42 and 43 are pivotally supported on the handle 10 , such as indicated in FIG. The pawls 42 and 43 have teeth 44 which rotationally drivingly engage the gear teeth 33 when the pawls are pivoted to be in that engagement. A spring 49 can contact the pawls for urging the pawls into gear-engaged relationship. In FIG. For selectively pivoting the pawls 42 and 43 out of gear engagement, there is a control cap 47 which is rotational on the handle 10 and is contained axially by the adapter, as seen in FIGS.
The control cap 47 has two protrusions on the interior, such as the shown protrusion 48 in FIG. That can pivot the pawls individually and out of engagement with the gear teeth 33 , and both pawls are shown engaged in FIG.
In that arrangement, with a clockwise rotation of the control cap 47 , there will be a camming engagement by the control cap 47 with one of the pawls 42 or 43 to establish gear engagement and thereby produce a clockwise drive from the handle to the adapter. That is, tool operative drive rotation is then in the same direction as the rotation of the control cap For this invention, the pawl and control cap arrangement can be conventional and different from that shown herein, and it is the snugness of the gear that is important.
The adjuster member 28 has slits 51 extending through the screw threads 29 , and that presents several radially flexible legs on the member The member 28 can be threadedly tightened in the handle member 14 to thereby force against the gear 32 , as mentioned. A lock plug 52 has screw threads 53 and is threaded telescoped inside the member 28 and it has a tapered end 54 to force radially outwardly on the member 28 and thereby lock the member 28 in its tight and axially set threaded position.
The plug 52 has a rectilinear interior socket 56 for reception of a conventional tool to threadedly tighten the plug inside the member 28 for the secure locking mentioned. It will also be noticed that the entire tool shown herein has an axially extending passageway 57 continuing the central opening 11 and extending entirely through the length of the handle 10 for cannulation throughout the entire tool, as best seen in FIG.
Thus, even the two ball bearing assemblies are torus-shaped for presenting that axial opening. In the foregoing description and the drawings, the method of making the shown tool is also disclosed. Included in that disclosure, is the assembly of the parts, seen in FIG. Then the member 28 is threadedly tightened to an adjusted relationship to exert desired fore on the gear 32 through the two bearings.
Then the lock plug 52 , with its tapered shoulder 54 , is tightened to secure the previously tightened member 28 and thus create the forces on the gear 14 , as desired. That also allows for easy rotation of the gear 14 relative to the handle The screw must be somewhat set for the ratchet to work, though.
A ratcheting screwdriver incorporates a ratchet inside its handle, with a gear wheel and two pawls. A ratcheting screwdriver has a switch in its handle with which the user can choose which direction will be the restricted one.
Thus, if driving a screw, clockwise is the restricted direction; that is, the handle won't be able to turn clockwise independently of the shaft. This is a tool that will allow you to just select the right bit and pop it into the handle to get the job started. That process is going to go much faster than fishing through a collection of 10 or more screwdrivers while looking for the right one. Also, you will only have to carry around the one handle along with the collection of the bits to have access to all of the various sizes and styles you need.
It really is the best of both worlds. However, it does much more than that. Since this is a ratcheting unit, you will actually be able to drive screws twice as fast as you could with a conventional screwdriver. The work that you do is amplified by the ratcheting mechanism, meaning overall you are going to have to provide less work to the tool in order to get the job done. Since you will need to both insert and remove screws through the course of most projects, there is a slider on this tool which will reverse the ratcheting direction of the driver.
But it could make a difference when reaching far into the tight quarters of say the engine bay on a car. I keep a lot of my tools in a tool drawer and various toolboxes. So I never worry too much about losing bits. But I do find it easy to organize and travel with my tools when they the come with some form of bit and socket storage. So you should look for tools with the following:. In the article I explain what a portable workbench is, what to look for and where to get one.
A portable workbench is a workbench that folds and can be easily stored and moved. It's Read more…. You can also buy cordless screwdrivers that do a lot of the work for you. Ratchet vs Nut Driver When you buy a screwdriver shaped ratchet screwdriver make sure that it has a ratchet and is not what is called a nut driver.
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