Quick-change drill bits and holder

This is an improved method for quickly changing and holding drill bits in electric drills. It includes hexagonal-ended drill bits and a holder with safety device for the bits. The holder is a steel sleeve with a male hexagonal end for insertion into 1/4" and larger drills. The opposite end is a female hex to receive the hex-ended drill bits. The holder is magnetized to hold the bits. The holder also supports a spring loaded two-piece safety split sleeve device surrounding the holder. The drill bit end of the split sleeve is folded over a fit into a circular groove in the drill bit and is held firmly in the groove by spring tension. This device keeps the bit in the holder when removing the bit from the material being worked. The split sleeves pivot at their attachment point to the holder, thus permitting rapid changing of drill bits (and other hex accessories) by simply squeezing the chuck end of the split sleeves causing them to pivot, thus opening the opposite end so that bits can be inserted and removed. The hex size of the drill bits and holder in this invention, for reasons of safety, is larger than the hex accessories currently on the market.

BACKGROUND 
This invention relates in general to electric drill accessories and in 
particular to a quick-change system for changing drill bits. 
Most drills require a chuck key to open the chuck for inserting a drill bit 
and then the chuck must be closed on the drill bit with the same key. Some 
drills come with a collar that must be held with one hand while operating 
the motor, to open or close the chuck. The forward/reverse switch must be 
operated to open chuck and then operated in other direction to close. 
About all this latter system does is eliminate the need for a chuck key, 
the process is certainly not fast. 
Keeping up with a chuck key can be a real inconvenience. Even when its 
whereabouts is known it can require walking several steps to get it and 
then return it after it has been used. Attaching the key to the drill cord 
is not satisfactory because it can catch on things and is awkward to use. 
If a key is properly used, it is inserted in each hole (3 in all) around 
the chuck and progressively tightened. However it is used, it requires an 
inordinate amount of time to change bits and to keep up with. 
WIth this invention, once the holder is in the drill, all that is required 
to change drill bits is to squeeze the split sleeves and insert or remove 
the bit. With screwdriver bits sized to fit this holder, a pilot hole can 
be drilled and a screw driven therein very quickly. Such a process with 
conventional drill bits is very time consuming. 
SUMMARY 
The magnetic holder with its split safety feature, in conjunction with the 
hex-ended drill bits, greatly speed up the process of changing bits. The 
system all but eliminates the use of a chuck key. Time saving and 
convenience are the primary advantages of this invention. The magnetic 
holder allows the bit to wobble a bit when running free but this is no 
problem. Metal should be indented with a punch before drilling. It is a 
good idea to do it in wood also. This prevents the drill bit from 
"skating". The drill bit is then placed in the indentation before turning 
the drill motor on, thus wobble is prevented. Most woods can be indented 
simply by pushing the drill bit into the wood before turning the drill 
motor on. 
The split sleeve safety feature prevents the drill bit from slipping out of 
the holder when removing the drill bit from the material being worked, 
which could cause injury if drill bit were still turning at high speed. 
The hex drill bits and holder would have a larger hex size than the hex 
accessories (screwdriver bits, etc) currently in use to prevent the use of 
the drill bits in holders not having the safety split sleeve device. 
It is obvious that the holder can be used with other hex-ended accessories 
such as screwdriver bits, sockets, hex keys and more which would be sized 
to fit the larger sized hex holder. In addition to quickly changing drill 
bits, a pilot hole can be drilled, the drill bit can be swapped with a 
screwdriver bit and a screw driven into pilot hole all in a fraction of 
the time it would take to use the standard chuck and drill bits.

DESCRIPTION OF THE PREFERRED EMBODIMENT 
To promote a better understanding of the principles of this invention, 
reference will be made to the embodiment illustrated in the drawings and 
specific language will be used to describe the same. It will nevertheless 
be understood that no limitation of the scope of the invention is thereby 
intended, such alterations and further applications of the principles of 
the invention as illustrated therein being contemplated as would normally 
occur to one skilled in the art to which the invention relates. 
Referring to FIG. 1, there is illustrated a drill bit holder and 
hexagonal-ended drill bit system 19. Together, this system 19 permits 
quick-changing of drill bits (and other types of bits as stated in the 
summary). The system 19 consists primarily of a holder 20 with attached 
safety split sleeve 22 and 23, and the drill bits 33 and 33-1. One end of 
holder 20 contains a rigidly attached hexagonal shaft 21 for insertion 
into the chuck of a drill. The shaft 21 measures approximately 1/4" across 
flats for use in 1/4" and larger drills. Shaft 21 extends inside holder 20 
a sufficient amount to achieve rigidity and to prevent slipping (see FIG. 
3). Holder 20 contains a magnet 38 inside abutted against shaft 21 (see 
FIG. 3). Magnet 38 is firmly attached to holder 20 to prevent movement. 
Referring to FIG. 3, holder 20 has two holes 34 and 35, opposite each 
other, centered and located approximately in the center longitudinally. 
These holes 34 and 35 accept tangs 24, 25 and 26, 27 respectively (see 
FIG. 2) to hold split sleeves 24 and 23 in place and permit split sleeves 
22 and 23 to pivot. Inside holder 20 at the open end is a circular groove 
37 to hold spring steel "C" ring 36 (see FIG. 2). This "C" ring engages in 
circular groove 31 of drill bit shaft 30 (see FIG. 1). Attached to holder 
20 are split sleeves 22 and 23 shown attached in FIG. 1. These split 
sleeves 22 and 23 are a safety device which hold the drill bit 33 tightly 
in the holder 20 when removing bit 33 from material being worked. Without 
the split sleeves 22 and 23 the drill bit 33 could separate from holder 20 
when bit 33 was removed from the work and could be spinning at high speed 
and conceivably fly away and cause personal injury. See FIG. 2 for an 
exploded view of these sleeves 22 and 23. Sleeve 22 has tangs 25 and 27 
for insertion into holes 34 and 35 respectively on holder 20. Sleeve 23 
has tangs 24 and 26 for insertion into holes 34 and 35 respectively on 
holder 20. The ends 22A and 23A of split sleeves 22 and 23 are folded over 
sufficiently to engage circular groove 32 of drill bit shaft 30 (see FIG. 
1) when the sleeves 22 and 23 are in their installed position and springs 
28 and 29 are extended. Squeezing split sleeve ends 22B and 23B causes the 
sleeves 22 and 23 to pivot at holes 34 and 35 in holder 20 thus opening 
opposite end for bit insertion and removal. Split sleeve ends 22B and 23B 
are also folded over slightly to permit a smooth, comfortable, finished 
surface. Split sleeve ends 22A and 23A extend beyond end of holder 20 
(FIG. 3) to permit engagement into circular groove 32 of drill bit shaft 
30 (see FIG. 1). The edges of split sleeves 22 and 23 from tangs 25, 27 
and 24, 26 are cut slightly at an obtuse angle towards ends 22B and 23B 
(see FIG. 3) of sleeves 22 and 23 a sufficient amount to permit pivoting 
holes 34 and 35 of holder 20 a sufficient amount to permit ends 22A and 
23A of split sleeves 22 and 23 to disengage from circular groove 32 of 
drill bit shaft 30. 
Drill bit 33, typical of drill bits with a diameter smaller than drill bit 
shaft 30; and 33-1, typical of drill bits with a diameter larger than 
drill bit shaft 30, are shown in FIG. 1. 
Drill bit shaft 30 is hexagonal in shape about 5/16" across flats. This 
increased size will prevent these drill bits from being used in currently 
manufactured holder without the safety provided by the split sleeves 22 
and 23. The increased size will also overcome the loss of strength caused 
by the circular groove 32. About 1/2" of drill bit shaft 30 fits into 
holder 20, the inside of which is also hexagonal in shape and sized to fit 
the approximate 5/16" size of drill bit shaft 30. Drill bit shaft 30 has a 
circular groove 31 cut only into the high points of the hex shape to 
engage "C" ring 36 (see FIG. 2) inside holder 20. Drill bit shaft 30 also 
has a circular groove 32 to provide shoulders for the split sleeve ends 
22A and 23A to hold against. 
FIG. 4 is an end view of holder 20 showing the end 22A of split sleeve 22 
in its installed position and overlapping the end of holder 20. Split 
sleeve 23 is shown removed from holder 20 and shows tangs 24 and 26. 
FIG. 5 shows system 19 all together. The engagement of split sleeve ends 
22A and 23A into circular groove 32 of drill bit shaft 30 can be seen. 
Position of tangs 24 and 25, and thus the pivot point, is shown. 
While the invention has been illustrated and described in detail in the 
drawings and foregoing description, the same is to be considered as 
illustrative and not restrictive in character, it being understood that 
only the preferred embodiment has been shown and described and that all 
changes and modifications that come within the spirit of the invention are 
desired to be protected.