These changes have direct bearing on the original covert saw being for larger sized pipe, being more rugged and larger in size to compensate for this fact. The reduced version going by the name covert saw ‘professional’ will be substantially easier to manufacture and is more ‘for’ the individual
The present invention relates to the field of cutting tools or more particularly as portable cutting tools for cutting metal and non-metal cylindrical articles more popularly pronounced as pipe, of assorted sizes and makeup.
Portable electrically driven tools for cutting steel, aluminum, copper, or plastic pipes embodies devices where the user presses a trigger that causes electrical energy to be turned into mechanical energy through use of a small portable motor which interacts with gears, pinions and chains to turn or operate blades designed to cut through metals of assorted nature.
The present field of study involves a wide variety of structural configurations, though certain aspects of all embodiments are basic and similar in construction there remains a wide spectrum of methods and designs. The most popular and basic structure for cutting cylindrical pipes seems to embody the use of rollers mounted on the end of a threaded bolt that incorporates a handle of differing builds on the opposite end of the said rollers and also mounted on said bolt. When the said handle is turned, the threads of said bolt turn inside of a nut that is casted to the main body of said pipe cutter, and a cutting blade is moved incrementally in the direction of the pipe being cut. This blade mounted on said bolt requires force to be applied between it and the tubular body being cut to enable it to force its way through the tubular body thereby severing said tubular body. This method (whether used in conjunction with a motor that turns the pipe or through manual means) see U.S. Pat. No. 1,945,949 R. L. Myers tube cutter Feb. 6, 1934 is by far the most popular amongst inventions defined specifically as pipe cutters even more specifically in the plumbing industry, but generally on the common market, this method is known as the primary means to cutting plumbing pipe.
But even with the many configurations devised to accomplish this same method,—see patents
Floor mounted Machines;
Table top machines;
Tripod Mounted;
Wraps around pipe;
Mounted on Pipe being cut;
Hand held Manual;
The most popular tools on the general market actually used by tradesmen to cut pipe outside of the field of plumbing is the saw zaw, U.S. Pat. No. 7,363,713 Reciprocating power tool Hirabayashi et al. Apr. 29, 2008 and the portable band saw, Pat. no. 2009/2065943 Philip T. Miller Oct. 29, 2009 and Pat. No. US 2007/0068011 Shibata et al. Mar. 29, 2007 Each of these are in a different specific class and non-related to the specific field of pipe cutters, presently spoken of. These two methods embody entirely different concepts of structure and use though they can also cut pipe, and are used to do so. These two methods, not specifically defined as pipe cutters but generally as saws for cutting metal, serve the entire pipe cutting market outside of plumbing. If some of the above mentioned and heretofore mentioned patents, used as reference, of the same class of pipe cutters have been manufactured, they exist and are used on the industrial level and are not on the common market for use by common tradesmen where the actual installation of cut pipes occurs. Out of all the tools mentioned one such tool recently did hit the market about two years ago similar to Pat. No. Des. 329,793 Kenji Fukuda Sep. 29, 1992 using the traditional blunt pressure method for half inch O.D. pipe
The obvious reasons why these great ideas are not on today's market are confined within several reasons.
The method using pressure applied to a blade onto the pipe being cut was a great idea when made manually, but when converted to an electrical version, because of the torque required to cut through the pipe by the blade, along with the torque required to turn the pipe at the same time, or also, the effort required in just simply holding the pipe stationary as this torque is applied is difficult, and costly. Usually to accomplish these task you need a rather bulky machine or vise in operation, taking it out of the realm of being a portable hand held tool. But even with this these machines labor to cut stock such as rigid steel pipes.
The portable band saw of which commonly uses a blade in a band shape for which revolves around cylindrical wheels rotating in the same direction, where the blade has punched teeth that force there way through metal surfaces using torque motors and leverage. The principles of the saw-zaw contrarily uses a streamlined blade attached to an arm which reciprocates back and forth using speed and traditional sawing action to eat away at a metal surface along with using leverage to force itself through.
In both cases you have an environment where the blade is exposed to the user who has to be extremely careful while handling the tool. The danger of an exposed blade is constant, real, and continuous for every time the handler pulls the trigger to induce the mechanical power. The operator has to be conscious even when there is nothing being cut; that when the trigger is pulled after disengaging any safety buttons he has to be conscious of the whereabouts and position of the blade with relation to his own body parts. In addition; factors such as binding, shifting, blade angle, unintentional or not can cause sudden jerking which can be very ominous to the most experienced and cautious users even with the implementation of guards. The tool could also experience blade breakage, which can send a sharp metal object flying past the users face or in a worse case scenario direct contact with the blade can occur.
Here are some other pipe cutters more closely related to the present invention than those mentioned above as portable power tools to be used by tradesmen, incorporating both d.c. and a.c. power sources to turn pinions and gears to power assorted blade types through the metal being cut, in order to dismember the metal and non metal cylindrical bodies;
Heavy duty portable power tool with an outer casing
Special mechanical electric/mechanical methods;
Portable electric;
While cutting, it is a requirement that users wear goggles, this is very important and we suggest that this continue even with usage of tools such as the covert saw. While cutting pipe with traditional saws very hot debris and shavings fly past the users face and under these conditions goggles are preferable and necessary. It is common though that 75 percent of users do not wear goggles even at severe risk of losing an eye or even mortality.
Within different trades there is a need to cut pipe straight. Tradesmen with more experience learn with time how to do this. For the most part if you take a look at most cuts, they are more usually than not crooked or jagged especially when the cut is done by inexperienced users.
Under most circumstances it would be advantageous to prevent blade wear of which happens most often through just normal wear and also heating effects on blade material. Heating effects are lessened when the blade is in motion. Less force has to be applied to get the blade to cut faster, and this also lessons wear to increase blade life. However as mentioned earlier when the blade is moved by the operator there are dangers involved with binding, breakage of blade, and a host of unpredictable turns of events involved with operator error, inherent to happen, and does, at very not surprisingly short intervals.
With this you have two very conflicting circumstances. To cut faster and make the blade last longer by lessening the heating effects you have to move the saw around; yet because of the potential threat of injury it is very dangerous to do so. The operator has the choice of chancing serious injury by moving saw around, or being more careful, but spending more money in purchasing blades that burn out at unnecessary rates. Most users work for someone else and are unaware of these facts; they impatiently just want to get the job done faster so they use force to speed things along not being concerned actually if someone else has to pay for the blades. But they constantly put themselves at risk of injury because of this impatience.
As you can see there are various forms of pipe cutters including some of the general structural and operational features of the present invention heretofore have been provided such as those disclosed in paragraph [0020]-[0022]. However, these previous known forms of pipe cutting devices do not include the overall combination of structural features incorporated in the present invention.
The object of this invention is to solve the aforementioned problem where the user does not have to physically move the saw around to lessen heating effects detrimental to blade life because the blade motions and the separate cage motion in the opposite direction of the saw blades does this for him.
It is also the object of this invention to create a safer environment by taking more control of cutting by providing the motion to do so in order to lessen or reduce operator control and error in providing more precision movement necessary to prevent binding, and kick back which happens through application of uneven force applied by user. This would lessen the rate of injury inherent in all fields where pipe has to be cut and installed.
It is even further the object of this invention to provide an over all housing in which the cutting is done so the dangers inherent in an open environment where flying projectiles, chips, hot shavings, and the blade itself cannot reach vulnerable places on the users body where it can cause damage.
It is also the object of this invention in not assuming to replace the necessity of goggles or to make people use them, but to provide a viable source of assistance in at least keeping down injury for the majority who do not use them by providing a housing with within cuts are made to eliminate the possibility altogether.
And further the object of this invention is to introduce a new and unique method of cutting pipe where any operator whether inexperienced or not can use this tool to make straight accurate, precision cuts on pipe.
It is further the object of this invention to provide an easy to build, working, usable pipe cutting saw that is convenient, economical, light weight, easy to use, and marketable by today's standard's because of the safety aspect, the fast action in the cuts and the attractiveness within the saw build.
Another object of this invention is to provide an alternate means to cutting assorted sizes and material makeup of pipes than the typical method incorporating rollers and blades utilizing pressure between a blade and a pipe being cut using substantial pressure therewith to force a blunt blade through a pipe
It is also the object of the present invention to provide a saw with a motor drive means, and assortment of gears and pinions that has two sets which can operate in opposite directions from, each other to turn two planetary beveled gears that rotate in opposite directions from each other. One planetary beveled gear 12 with the teeth on the side can be attached directly to a cage 44 mounted on wheels 60 and housed inside of a cutting drum 62 to turn said cage 44 in one direction with cutting blade bodies 1 mounted on said cage 44 to revolve around said cage 44 when said motor 72 drive 70 is engaged. On the opposite side of said cage 44 you can have the second beveled planetary gear 45 with said second beveled planetary gear 45 being bolted to a planetary inside gear 47 or a planetary solid chain 47, both of which is floating where the inside gear 47 or chain 47 portion has two flanges 49 on each side to hold said planetary inside gear 47 or planetary solid chain 47 in place on top of spur gears 22 or sprockets 22 with said spur gears 22 or sprockets 22 supporting the planetary inside gear 47 or solid chain 47 that is bolted to the said planetary beveled gear 45.
It is also the object of the present invention to provide a process by which the said planetary inside gear 47 or planetary solid chain 47 is engaged by a beveled gear 65 driven by said motor 72 through pinions and spur gears 70, 67 in the opposite direction as the said beveled planetary gear 12 attached directly to said cage 44. This floating gear 45, 47 being made up of the planetary beveled gear 45 that is bolted to a planetary inside gear 47 or solid chain 47 with flanges 49 on the sides that is bolted thereupon, turned by a beveled gear 65 mounted on a shaft works to power said spur gears 22 or sprockets 22 that are attached to a shaft 65 going through the cage cross brace member 78,
It is also the object of this invention to provide a means of support for the pipe being cut through a jaw assembly 53 mounted independently to the inside of the saw body 16 on a donut shaped plate 64
It is also the object of this invention to provide a means where the blade housings 1 consisting of inner spur gears 4, 6 or sprockets 4, 6
This planetary inside gear 80 with flanges 83 will float on top of spur gears 85 that are attached to the cage cross member 18 so that when said pad 87 is released by the said ball pen tabs 29 and is pushed forward or back this action will work to turn the floating planetary inside gear 80 and adjust the blade housings 1 that are on their own diametrical axis toward and away from the pipe being cut. This planetary inside gear 80 will also incorporate a brake pad locking device 96 set on springs 98 that keep the planetary inside gear 80 biased toward being locked in rotation with the cage cross member 18 unless the ball pen tab 29 is released and the handle 38 is pushed down releasing the locking device 96 which acts as a brake pad 96 to adjust the axis of the blades 1 towards or away from the pipe being cut.
It is the object of this invention to provide an alternate and a more simple embodiment eliminating the additional gear and brake section for lowering the blade housings 1 by placing the outer handle 38 on a pivot with a pad 7 on the opposite end of the handle 38 to contact the top surface of the planetary inside gear 80 or sprocket 80 eliminating the planetary outside gear 81 and providing a smooth surface on the outer side of the planetary inside gear 80 to be contacted by the 7 pad on the opposite end of the outer handle 38 that is on a pivot so that when the user pull back on the top handle 38 the pad 7 will pivot on an axis towards the smooth outer surface braking the rotating cage 44 by means of this contact to the floating inside gear 80 slightly forcing the individual blades 1 into the pipe being cut being controlled by the pressure applied by the user by pulling back on the outer handle 38.
It is also the object of the present invention to provide more cutting power to the cutting blades 1 by rotating the cage 44 in the opposite direction of the rotating axis of the individual blades 1.
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The present invention will now be described in a more detailed manner with reference to the accompanying drawings in which embodiments of the invention are shown. Notwithstanding the drawings and following explanations are to be understood instructively and are intended to ensure that the idea of the invention is thoroughly understood. By contrast these exemplary embodiments are not intended to be used to restrict the invention which will be defined solely in the claims and which discloses to the person skilled in the relevant art a markedly wider range of embodiments than can be illustrated within this framework.
Within
On the motor shaft you have a pinion 70 which drives two spur gears on a rod with the opposite end of the rod consisting of a spur gear 67 for powering blades 1 going in one direction, and 76
Both gears 67 and 76
The planetary gear 45 is resting directly on top of three spur gears or sprockets 22 (In the professional version) of which they act to support the planetary gear 45 because of the flanges 49 on the sides of the inner teeth of the gear 45. The spur gears or sprockets 22 are attached to an extension arm that pass through the cage 44 and into the blade housings 1 where another gear 4 or sprocket 4
The cage 44 has two tiers, inner and outer. The inner tier is comprised of the cross members 18 and blades 1, and the outer tier has the wheels 60 attached, also see
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Please keep in mind that we are dealing with a system of parts that move. The cage 44 rotates around carrying the blades 1, which rotate in the opposite direction giving a dragging effect. So to lower blades 1 into place we have a system that will attach itself to the cage 44 and blades 1, execute its function and then separate itself and remain separated from the moving parts.
The handle 38 has a release button 98 on the top
There is a flat plate 93 that is attached to the stem of the 89 spur gear protruding from the bottom spring box 91, see also
In another embodiment to this invention we eliminate gears 88 and 89 along with the entire brake set up in
This invention is related to and claims priority and benefit of U.S. provisional Patent application Ser. No. 61/272,450 filed Sep. 24, 2009, titled Covert Saw ‘Professional’, the inventors being Richard H. Poindexter, and Anthony J. Vola, of which is incorporated herein by reference. This invention is also related to and claims priority and benefit of Deserted U.S. provisional Patent application Ser. No. 61/213,847 filed Jul. 20, 2009, titled Covert Saw, Richard H. Poindexter, and Anthony J. Vola. Within provisional patent No. 61/272,450 you see the same utility make-up as provisional patent No. 61/213,847 except for the differences of: A. Three blades instead of fourB. Reduced gear compartmentC. Change from reciprocal motion of cage to rotation in one directionD. And as a result of C slight change in braking configuration.E. Slight change in back side of outer body to trim wasted space.
Number | Date | Country | |
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61272450 | Sep 2009 | US |