Patent Application
20070107945
1. Field of the Invention
The present invention pertains to manually operated augers, and more particularly to apparatus that uses straight line manual motions to rotate an auger.
2. Description of the Related Art
Augers for drilling in ice and earth are well known and in widespread use. Augers typically include a center shaft. A helical band with a cutting edge at one end surrounds the center shaft. Rotating the center shaft causes the cutting edge to cut into the ice or earth. The helical band pushes the cut material away from the cutting edge to make a hole.
Some prior augers were manually driven. Manual augers were usually light weight, fairly inexpensive, and relatively easy to carry. An example of a prior manual auger, which uses a crank and gear mechanism, may be seen in U.S. Pat. No. 1,294,098. U.S. Pat. No. 4,817,735 shows a foot powered auger. Perhaps the classic example of prior manual augers is described in U.S. Pat. Nos. 2,393,282; 2,476,047; 3,051,253; 3,929,196; and 5,038,870. Those five patents each show an offset handle connected to an auger center shaft. A person grasped the handle with one hand and steadied the auger with the other hand. The person exerted his shoulder and arm muscles to produce a circular motion with his first hand, thus turning the handle and the auger.
When using a manual auger with an offset handle, multiple combinations of forces had to be generated by the person for each revolution of his hand. Specifically, a first force was generated to pull the hand in a first motion toward his body. Then the handle was forced across the front of the body in a second motion. Then, the person had to push the handle away from his body in a third motion. Finally, the person forced the handle across the front of his body in a fourth motion opposite the second motion. The process was repeated for each revolution of the handle and auger.
Because of the nature of ice and earth, considerable effort was required to drill holes with offset handle augers. Ergonomically, it was very difficult for most people to perform three of the four handle motions. The only motion that most people could complete with ease was the first motion of pulling the hand toward the body. That was a fairly natural motion during which most people could generate the maximum force with their arms and shoulder muscles. In general, younger, older, and other persons without adequate strength could not easily use the prior manual augers.
To ease the task of drilling in ice and earth, power driven augers have been developed. A common power source was a gasoline engine that connected to the auger center shaft. Some augers were powered from remote locations by suitable transmissions. U.S. Pat. Nos. 3,710,877; 3,828,861; and 4,116,284 illustrate different kinds of remote power sources and associated transmissions. Japan patent application number 1998000220506 teaches an auger powered by a motor and assembled to the end of a crane boom.
There are several disadvantages associated with power augers. In addition to being undesirably expensive, they are heavy and awkward to carry. The engines are subject to environmental standards, including emission controls and anti-noise ordinances. A related problem concerns the odors emitted from the engine, which is only an arm's length from the user's face. The noise and emissions make it an unpleasant task to drill holes with power augers. Moreover, power augers develop high torque, so safety is a major concern.
Thus, a need exists for improvements in ways to operate augers.
In accordance with the present invention, a recoil auger with a clutch bearing is provided that requires a person to exert only bi-directional straight line motions of the person's hand, arm, and shoulder to operate. This is accomplished by apparatus that includes a recoil mechanism that imparts unidirectional motion to an auger.
The auger has an auger shaft and a helical band around the shaft. A working end of the helical band at the auger first end is sharpened. A second end of the auger shaft is connected to the recoil mechanism. The recoil mechanism is part of a recoil drive system that also includes a housing and a handle.
According to one aspect of the invention, the housing is rotatably mounted to one end of a drive shaft, which may be either the auger shaft or a separate output shaft connected to the auger shaft. The recoil mechanism utilizes a one-way clutch bearing to impart unidirectional motion to the drive shaft in response to straight line motions exerted by a person. The recoil mechanism also includes a mounting sleeve secured to the drive shaft. On the mounting sleeve is the one-way clutch bearing. The outer race of the clutch bearing supports a rope wheel. Rotating the rope wheel in a first direction also rotates the mounting sleeve and the drive shaft. Rotating the rope wheel in the second direction has no effect on the mounting sleeve or drive shaft. A recoil spring biases the rope wheel to rotate in the second direction relative to the mounting sleeve and drive shaft. A rope with a pull handle is wound on the rope wheel. The rope is wound such that pulling the pull handle rotates the rope wheel in the first direction.
In operation, a person grasps the handle with one hand and the rope pull handle with the other hand. He pulls the rope pull handle in a straight line motion with his hand, arm, and shoulder to rotate the auger. Upon releasing the rope pull handle in an opposite straight line motion, the recoil spring rotates the rope wheel back to the starting position, rewinding the rope without manual effort and without effect on the auger.
Further in accordance with the present invention, more than one recoil mechanism may be incorporated into the recoil auger. Each recoil mechanism has its own rope wheel and clutch bearing. Different persons pull respective rope pull handles, thereby increasing the speed and torque that can be applied to the auger. The one-way clutch bearings enable pulling and rewinding each rope independently of the other ropes.
To further increase the convenience of using the invention, a separate handle may be incorporated into the recoil auger for each recoil mechanism.
It is a feature of the invention that the auger may be disconnected from the recoil drive system. For that purpose, the drive shaft constitutes the separate recoil mechanism output shaft, which is disconnectable from the auger shaft. The free end of the output shaft is designed to selectively connect to and disconnect from the auger shaft. In that manner, the recoil auger of the invention may be broken down for easily transportation.
The method and apparatus of the invention, using just straight line bi-directional motions by a person, thus enables holes to be drilled in an ergonomically satisfactory way. The probability of unsuccessful operation is remote, even though he may not have adequate strength to generate forceful circular motions with his hand, arm, and shoulder.
Other advantages, benefits, and features of the invention will become apparent to those skilled in the art upon reading the detailed description of the invention and studying the drawings.
Although the disclosure hereof is detailed and exact to enable those skilled in the art to practice the invention, the physical embodiments herein disclosed merely exemplify the invention, which may be embodied in other specific structure. The scope of the invention is defined in the claims appended hereto.
Looking first at
The particular recoil auger 1 illustrated is comprised of an auger 3 connected to a manual recoil drive system 121. The auger 3 preferably has a sharpened end 6 opposite the recoil drive system 121. Operation of the recoil drive system causes rotation of the auger about a longitudinal axis 122 of the recoil auger to drill into the ice or earth 9.
The auger 3 includes an auger shaft 11 around which is a helical band 13. The auger sharpened end 6 may be in the form of a knife 15.
In the preferred embodiment, the recoil drive system 121 is disconnectable from the auger 3. For that purpose, the auger shaft 11 has a socket 107 that receives an end 109 of a separate recoil drive system output shaft 119, as will be explained shortly. A thumb screw 113 is used to hold the shafts 11 and 119 to each other and concentric to the longitudinal axis 122. In that manner, the recoil auger 1 can be broken down for easy transportation.
The auger 3 is unidirectionally rotated by manual operation of the recoil drive system 121. Looking also at
Received in the housing tubular wall 126 is a thrust bearing 127. The inner race 128 of the thrust bearing 127 is fit over the output shaft 119 to thereby guide the output shaft in the housing 123. A collar 129 with a bolt and nut 131 positively holds the thrust bearing in place on the output shaft.
The recoil mechanism 125 is assembled to the output shaft 119. For that purpose, a mounting sleeve 133 is secured to the output shaft, as by a bolt and nut 135. A one-way clutch bearing 137 is assembled over the mounting sleeve 133 and located against a shoulder 139 thereon. Any commercially available clutch bearing of adequate construction and torque capacity is suitable for the clutch bearing 137. An example of a suitable clutch bearing is a Model CSK25 marketed by Marland Clutch of Burr Ridge, Ill. Fit over the outer race of the clutch bearing is a flange 141. A rope wheel 143 is fastened to the flange 141 by conventional fasteners, not shown. In the outer periphery of the rope wheel 143 is a groove 145. A rope 39 is wound around the rope wheel groove 145. The rope 39 terminates in a rope pull handle 41.
There is a recoil spring 147 between the rope wheel 143 and the mounting sleeve 133. The recoil spring 147 hooks at one end 152 thereof to the rope wheel, as to a rib 149. The other end 154 of the recoil spring hooks to the mounting sleeve 133, such as in a slot 151.
The recoil spring 147, rope 39, and clutch bearing 137 are assembled in a definite relation to each other. The rope 39 is initially wound on the rope wheel 143 with the recoil spring 147 in a relaxed condition. Looking especially at
The clutch bearing 137 is assembled to the flange 141 and the mounting sleeve 133 such that rotating the rope wheel 143 in the direction of arrow 153 also rotates the mounting sleeve, and hence the output shaft 119, in the direction of arrow 153. Rotating the rope wheel in the direction of arrow 155 has no effect on the mounting sleeve or output shaft.
In operation, a person grasps the handle 28 of the recoil auger 1 with one hand 156,
It is an important feature of the invention that the auger 3 is rotated about the longitudinal axis 122 using only the bi-directional straight line motions 101 and 103 of the persons's arm, hand, and shoulder. The problems associated with the multiple circular motions required for prior manual augers with offset handles is therefore eliminated. Even persons of modest strength are capable of drilling holes using the present invention.
As mentioned previously, the auger 3 is disconnectable from the recoil drive system 121 by means of the socket 107 and thumb screw 113. It will be appreciated, of course, that the auger shaft 11 and the recoil mechanism output shaft 119 may be a single integral piece, if desired.
Turning to
To enable two or more persons to operate the recoil auger 157, the housing 169 has a handle in the form of a circular gripping ring 177. Also see
Between the recoil mechanisms 185 and 185A is a gripping ring 187. The gripping ring 187 has a plate 189 with a tubular wall 191. A bearing 193 is pressed into the wall 191 and over the output shaft 175′. The bearing 193 is held in place by a collar 195 and bolt and nut 197. The plate 189 may be configured like the plate 170, in that it has a circular gripping ring and spokes analogous to the ring 177 and spokes 179 described in conjunction with
In summary, the results and advantages of holes in ice and earth can now be more fully realized. The recoil auger with clutch bearing of the invention provides both an ergonomically sound way to manually operate an auger as well as unidirectional rotation of the auger. This desireable result comes from using the combined functions of the recoil drive system. The handle provides a good grip for a person's first hand. The recoil mechanism rotates the auger in response to straight line motions and of the person's second hand, arm, and shoulder. The person exerts the straight line motions on the rope pull handle to selectively wind and unwind the rope on the rope wheel. The clutch bearing 137 rotates the auger when the rope is pulled, but the clutch bearing freewheels during the rope return stroke. Dual recoil mechanisms enable two persons to simultaneously operate the recoil auger.
It will also be recognized that in addition to the superior performance of the recoil auger of the invention, its construction is such as to to be of modest cost in relation to the benefits it provides. Its ergonomically superior design more than compensates for any increased cost relative to prior ergonomically unsatisfactory manual augers.
Thus, it is apparent that there has been provided, in accordance with the invention, a recoil auger with clutch bearing that fully satisfies the objects, aims, and advantages set forth above. While the invention has been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations as fall within the spirit and broad scope of the appended claims.
