Hinged socket wrench speed handle

A hinged socket wrench speed handle having an offset shank (20) with a first end (22) and a second end (24). Attached to the first end (22) is a clevis (28) which receives a 180-degree drive head that is held by a hinge pin (40). The drive head consists of either a square drive head (30) or a ratchet drive head (31). To the second end (24) is attached a handle (58), which rotates the wrench. A second embodiment of the hinged socket wrench includes a second clevis (28) that is added to the second end (24) of the offset shank. The second clevis (28) adds further combinations of angular displacement of the handle (58). Thus increasing the value of the wrench as a tool and also its utility in difficult work areas. The wrench consists of five hinge pin (40) variations which provide additional surface interface with both the hinge pin and the handle yoke, thereby improving the structural integrity and prolonging the tool's life.

TECHNICAL FIELD

The invention pertains to the general field of socket wrenches, and more particularly to a speed handle for a socket wrench that has a single or double offset shaft to which is attached a lockable-position, square drive head or a ratchet drive head.

BACKGROUND ART

Previously, socket wrenches equipped with various types of speed handles, or spreader wrenches, have been used to provide a fast and easy method of rotating a threaded fastener using conventional sockets. The usual approach has been to utilize an extended handle having four 90-degree bends, and a rotating grip on one end and an offset parallel with the handle shaft. This configuration permits a user to grasp both the grip and offset portion simultaneously and to rotate the tool rapidly, much like a crank handle or a brace and bit. Many combinations of handle offsets and multiple bends have been utilized for sockets and screwdrivers in order to employ the principle of rapid manual rotation by the shape of the tool handle.

A search of the prior art did not disclose any patents that read directly on the claims of the instant invention, however the following U.S. patents are considered related:

My U.S. Pat. No. 6,349,620 issued Feb. 26, 2002 is the basis for the improvements of the instant invention. The improvements to my patent include two embodiments and five alternative variations of a slideable hinge pin that locks a drive head in place at a desired angle. These improvements are important because they provide additional surface interface with both the hinge pin and the handle yoke which improves the structural integrity of the invention as well as prolongs the life of the tool.

U.S. Pat. No. 5,768,960 issued to Archuleta is for a tilt wrench having a handle with a pair of opposed openings on each end that have different geometrical shapes. A tilt head has an additional shaped hole that is in alignment with the handle openings. A connector shaft having a round shape on one end and a square shape on the other end extends through the three openings and, when pressed inward interfaces with the tilt head, locking it in place. Selective axial positioning of the connector shaft allows the tilt head to be in either a locked or unlocked position.

Edmons in U.S. Pat. No. 5,511,452 teaches a speed handle with a ratchet drive having an offset located between the axis of the handle and the ratchet drive for use in tight places where there is little room for the handle. The balance of the speed handle is conventional, much like those currently available.

U.S. Pat. No. 5,279,189 issued to Marino has a pair of handles displaced longitudinally by a given distance, and a hinge connecting a coupling to an arm or one of the handles, thereby permitting relative movement therebetween about a pivot axis normal to the rotational axis of the coupling.

Anderson's patent 4,974,477 is for a speed wrench using an S-curve shaped shank. The shank causes the axis of the tool to intersect the axis of the handle, thereby creating a cone-shaped pattern of rotation, which permits the user to rotate the tool's handle with wrist motion.

Klank in U.S. Pat. No. 3,388,622 discloses a speed wrench consisting of a pair of concentric, rotatively-connected members. One arm is radially offset from the common axis of concentricity relative to the outer member such that cranking of the handle rotates a work engaging arm.

U.S. Pat. No. 2,712,765 issued to Knight, Jr. is for a wrist motion hand tool having a shaft with a pair of bends having a slight longitudinal or axial displacement in the bore of a pistol-grip shaped handle. The wrist motion of the user rotates the crank arm and only one hand is required to rotate a workpiece.

Stewart's U.S. Pat. No. 460,256 teaches a handle for a rotary tool using a pair of bends in a shaft that form a diagonal wrist. An anti-friction sleeve is added to the handle for ease of rotation.

For background purposes and as indicative of the art to which the invention relates reference may be made to the following patents found in the patent search.

DISCLOSURE OF THE INVENTION

In today's economy, manpower is expensive and any tool or device that can reduce the time spent accomplishing a given task is of extreme importance. Therefore, the primary object of the invention is to provide a hand tool that can be utilized with most popular socket sets, and that shortens the time required to attach or remove a threaded fastener, with a polygon-shaped or other configured head, on a screw, bolt or nut. Normally, a ratchet handle is connected to a socket and ratcheted by radial motion with one hand while being held in place with the other hand. The instant invention permits a user to rapidly rotate a nut or bolt until it starts to tighten. The rapid rotation is accomplished by simple wrist action, with considerably more speed than a conventional ratchet handle. It has been determined that by using the instant invention the tightening or removal of a fastener, after its initial loosening, is four to five times faster.

Further, an important object of the invention is its ability to initially loosen or finally tighten a fastener by simply repositioning the handle at a suitable angle to gain the maximum amount of torque. The repositioning is provided in a 180-degree arc by a rotatable square drive head or a ratchet drive head that permits the socket to remain on a workpiece, and the handle to be moved to a convenient position like a standard breaker bar or flex handle. As the invention is relatively short and compact, a user may shift from a vertical position to a 45 or 90-degree angle in almost one continuous motion. This allows the user to maintain absolute control of the socket upon the workpiece and to continue adding torque until the workpiece is tightened, or the reverse if loosening is to be accomplished. As the result of the drive head being repositionable, any combination of angular displacement is easily accomplished without lost motion.

Another object of the invention is directed to a unique locking system that secures either the square drive head or the ratchet drive head at a given angle relative to the handle. This feature is particularly useful when the tool is used like a “bull handle” or an “L-handle”. Further, the arrangement locks the head at equal angular increments, which are at the most convenient positions. It should also be noted that it is not necessary to lock the head, as it rotates under a small amount of tension and is temporarily held at the angular displacement by a spring-loaded detent so it can be controlled during operation. Locking is easily and intuitively obvious by simply pressing a hinge pin on one direction or the other for positive positioning at the 45-degree increment.

Still another object of the invention is the combination of a rotatable handle and an offset shank in a compact configuration. This coalescence of elements permits the user to use only one hand to rotate the socket easily, whereas conventional ratchets require two hands. Flex handles and the like require removing the socket each time the rotational limit is reached. Conventional speed handles are long and have limited utility as unrestricted space is essential to their function. In contrast, the instant invention is compact and may be used in most places that a conventional ratchet handle is normally employed, utilizing both the speed handle's quickness and the ratchet's usefulness.

Yet another object of the invention is realized in a second embodiment, wherein a second head is used that is similar in function, but only connects the shank to the handle, wherein the shank may be changed in its angular alignment relative to the handle. This embodiment is particularly useful in areas that are tight and hard to reach with conventional straight or fixed angle tools. It may be plainly seen that the use of another head permits the handle to be positioned independent of the square drive head or the ratchet drive head. Therefore, as many as five additional angles may be used in attempting to find the most practical approach to loosening or tightening a fastener, even under the most difficult circumstances.

Still another object of the second embodiment is a feature that permits the wrench to be positioned in crank fashion, with the handle vertical along with the square drive head. This unique position allows a fastener to be rotated like a crank handle, with the shank horizontal or angled 180, 90 or 45-degrees, while still retaining the ability to be rotated as described above in certain combinations of angles.

The improvement of the invention is embodied in the interface between the drive head and the hinge pin, as the round segment of the hinge pin is larger in diameter than across the flats of the square segment. The combined round and octagonal hole in the drive head has each inner angular apex shaved off by the introduction of a round portion of the hex hole. This arrangement allows the round segment of the hinge pin to interface with only the round portion of the hole instead of the sharp inside corners of the octagonal shape. It may be clearly seen that this arrangement takes the slop out of the interface, improves the life of the tool since without the combined round and octagonal hole the interface will quickly wear out, and greatly strengthens the integrity of the invention.

A final object of the improvement of the invention is directed to the inclusion of five separate, but related, variations of the slideable hinge pin that locks the drive head in place at a desired angle. Any one of the five variations provides additional surface interface with both the hinge pin and the handle yoke, which prolongs the life of the tool.

These and other objects and advantages of the present invention will become apparent form the subsequent detailed description of the preferred embodiment and the appended claims taken in conjunction with the accompanying drawings.

BEST MODE FOR CARRYING OUT THE INVENTION

The best mode for carrying out the invention is presented in terms of a preferred embodiment and a second embodiment of a hinged socket wrench speed handle. Both embodiments are alike except the second embodiment has an additional pivoting head on the end of an offset shank that is located adjacent to the handle. The preferred embodiment is shown inFIGS. 1 through 23, with a single pivoting head shown inFIGS. 1,2,3,11,21and22. The second embodiment with the additional pivoting head is shown inFIGS. 12,13,17,18,19,20and23.

The offset shank20, in either embodiment, is round in shape and is made of metal, has a first end22, a second end24, and two opposed bends26that are integrally formed or forged during fabrication. The bends26are of equal angles from 10-degrees to 90-degrees, with 45-degrees being preferred, and the first end22and second end24are parallel in each opposed direction, as illustrated inFIGS. 1,3and11. A clevis28is integrally formed into the first end22of the shank, thus forming a bifurcated fork, as illustrated best inFIG. 11.

In both embodiments, either a square drive head30or a ratchet drive head31may be pivotally disposed within the shank first end22. Both heads30,31can be configured to accept wrench sockets. Preferably, the drive heads30and31are dimensioned to fit a conventional ¼-inch, ⅜-inch and ½-inch drive, however other sizes may be included and used with equal ease (such as metric sizes). The square drive head is shown inFIGS. 1–6,11–14and18–20, while the ratchet drive head is shown inFIGS. 21,22and23. For brevity, the remainder of this disclosure will only make reference to the square drive head30, which also applies to the ratchet drive head31.

The assembly of the drive head30into the clevis28allows an angular position retaining means, which comprises means to intersect rotation with at least five discrete positions, with a total displacement of 180-degrees, as defined by the utilization of a spring-loaded detent ball32. The ball32is located within a bore34in the bifurcated fork, and the drive head30contains a plurality of coequally-spaced depressions36, with 45-degrees being preferred, as illustrated inFIGS. 4,6and11, however any number of equal spaces may be employed with like ease and utility. The detent ball32intersects with the depressions36, which holds the drive head30in specific angular positions. The invention can also easily be adjusted by hand when another angle is desired. It should be noted that the drive head30contains a spring-loaded drive detent38for holding sockets in place, which is well known in the art and in common usage.

The square drive head30is rotatably held between the jaws of the forked clevis28with a slideable hinge pin40, as shown inFIGS. 7,8,11,24–30and33–36, thereby permitting the drive head to pivotally rotate and lock within the confines of the clevis28. Securement means to hold the hinge pin40in position from sliding from one side to the other is provided, as shown inFIGS. 3,11, and14, by the constant lateral urging of the spring-loaded detent ball32.

The hinge pin40is disposed through at least one square drive head30or ratchet drive head31, and the clevis28bifurcated fork, thereby permitting the drive head30to pivotally rotate and lock within the confines of the clevis28. The hinge pin40is slideable and held in position by lateral urging of the spring-loaded detent ball32, as previously discussed. There are five variations of the slideable hinge pin40, as shown in cross-sectional views ofFIGS. 33–42, with the preferred variation illustrated inFIGS. 1–3,7–14,18–24,25,28and33.

In the first four variations the invention utilizes the hinge pin40that has a metallic body66with at least one round segment68and at least one square segment70, and also means for retaining the hinge pin40within the hinged socket wrench speed handle. Both the square and ratchet drive head30and31contain a combined round and octagonal hole72therethrough, as illustrated inFIGS. 4,11,14and31. The reason that the hole72is described as being combined round and octagonal is that a round hole is bored first and two square holes are broached within the round hole. This design leaves internal intervening points radially truncated such that the round segment68of the hinge pin body66may slide easily inside without interference, while leaving the outside points sharp to interface with the square segment70.

The clevis28has a combined round and square hole74through each clevis fork, as illustrated inFIGS. 11 and 32, such that when the hinge pin40is manually urged in a first direction, the pin40is retained in the drive head30or31and rotates freely within the clevis28. When the hinge pin40is urged in an opposite second direction, the square segment70intersects with the shank clevis28, thereby locking the drive head30or31in place.

The combined round and octagonal hole72in the heads30and31each have their inner angular apex shaved off by the introduction of a round portion72awithin the hex hole, as illustrated inFIG. 6A. This arrangement allows the round segment of the hinge pin to interface with only the round portion72aof the hole instead of the sharp inner corners of the octagonal shape if the hole were not present. This embodiment is illustrated inFIG. 6B.

The means for retaining the hinge pin40within the hinged socket wrench speed handle are presented in three acceptable deviations, as they each accomplish the same task only in a different manner. The preferred retaining means utilizes a bore76in the hinge pin body66running completely through from end to end, as shown pictorially inFIGS. 8 and 28. A rivet78is disposed within the bore76, with the rivet head larger in diameter than the combined round and square hole74through each fork of the clevis28. The rivet78forms a limiting restriction that retains the hinge pin40in the fork clevis28. The unheaded end of the rivet78is bucked, thus forming a similar head.FIG. 11shows the unheaded end dotted, andFIGS. 10,28and33–36illustrate the head bucked.

The second means for retaining the hinge pin40within the hinged socket wrench speed handle is illustrated inFIGS. 26,27,29and30, wherein the hinge pin40includes a threaded extended neck80on each end. A hinge pin stop82, shown by itself inFIG. 29, is disposed on each end of the neck80and is attached with a screw84fastened within the threads of the neck80. The hinge pin stops82also have a larger diameter than the combined round and square hole74through each fork of the clevis82, thus forming a limiting restriction that retains the hinge pin40in the clevis fork. In both variations of the hinge pin retaining means the head of the rivet78and the hinge pin stop82are round and may be contoured to follow the shape of the outer surface of the clevis28. The third variation is illustrated inFIGS. 37–42with a retaining ring52holding the hinge pin40in place.

As stated previously there are five variations of the hinge pin40, with four shown in the cross-sectional views ofFIGS. 33–36. All of the variations are acceptable as far as function is concerned, with the difference being in the rotation of the pin and the amount of engagement between the elements. The preferred variation, as illustrated inFIG. 33and also shown in the balance of the drawings, consists of a fully engaged hinge pin40with alternating two round segments68and two square segments70. It should be noted that the square segments70have ends or points that extend beyond the diameter of the round segments68which lock into the holes72and74of the clevis28and drive heads30and31, whereas the round segments68rotate freely. The unlocked illustration ofFIG. 33shows the pin40extending to the left of the clevis28, with a square segment70completely on the outside and the adjoining round segment68engaging the combined round and square hole74of the clevis28.

The adjacent second square segment70securely interfaces with the combined round and octagonal hole72in the drive head30or31, with the last round segment68rotating within the clevis28. It will be clearly seen that the drive head30or31is secured into the square segment70, embracing the pin40which, in combination, is free to rotate as the round segments68are configured to revolve and slide easily within the drive head and clevis holes72and74. To lock the pin40in place, the pin is simply slid to the right by manually pushing on the head, where the opposite action takes place with both the pin and drive head in contact with a square segment70, thereby locking the two elements tightly together. As explained previously, the hinge pin40is held in place by the constant lateral urging of the spring-loaded detent ball32in the depressions36on either of the drive heads30or31.

FIG. 34illustrates basically the same configuration as the preferred variation, except it is left handed or opposite in its function, which in the unlocked position the head is flush with the left side of the clevis28and protrudes on the right. The functioning of this variation is the same fully engaged type, with the pin40rotating within the clevis and drive head.

FIG. 35depicts a partially engaged variation with the pin40stationary. There is only one round segment68and two square segments70that function in the unlocked condition by having the square segments in contact with the clevis28. This variation eliminates rotation, while the round segment68permits the drive head30or31to move freely. When the pin40is slid to the right the two square segments interface with the clevis28fully on the left side, and partially on the drive head and right side of the clevis, thus locking both together.

The variation shown inFIG. 36is like the previous configuration except it utilizes two round segments68and one square segment70. When unlocked, the square segment70interfaces with the drive head30or31, rotating the pin40. When manually pushed to the left, the square segment70partially engages both drive head and right side of the clevis, locking them together.

It should be noted that five positions of the retaining means are shown employing the spring-loaded detent ball32, however the invention is not restricted to this specific number as any number of intervening polygonal depressions36may be easily utilized in incremental spacing. The drive head securement means is shown in the drawings and described as utilizing a square or polygonal shank46and an octagonal or polygonal depression56, a combination of one or more round segments68and one or more square segments70, to employ any polygonal shape in both elements. Thus as long as the depressions have a double amount of facets as that of the shank increasing the number of positions available for the angular displacement of the drive head30within the clevis28, still falling within the bounds of this invention.

The fifth variation is illustrated inFIGS. 37–39and differs only slightly than the other four in the hinge pin40configuration. The hinge pin40of the fifth variation is shown removed from the invention for clarity inFIGS. 38 and 39, and consists of a round body42with a rivet78. The hinge pin40penetrates the clevis28through a combined round and square hole74in one fork of the clevis28, and a round hole86in the other fork. This arrangement permits locking the clevis28, as the round segment of the hinge pin40is larger in diameter than the flats on the square segment.

In all variations a rotatable handle58is attached to the second end24of the shank20, thereby permitting rotation of the wrench upon reciprocation of the handle, and radial turning when urged at right angles to the head30. There are a number of methods that permit the handle58to reciprocate, with the preferred method illustrated inFIG. 3. The handle58is normally fabricated of a type of thermoplastic and includes a bore88therein that does not penetrate completely through. A handle sleeve90that has a slightly larger inner diameter than the offset shank20is placed over the shank20. The shank includes a threaded hole92in the end, in which a screw94retains a washer96that abuts tightly against the end of the shank20.

The entire handle assembly is pressed into place since the sleeve90is slightly larger than the bore88and the washer96has a smaller outer diameter than that of the sleeve90. The handle assembly is forced into the bore88until the head of the screw94almost touches the end of the bore88, thereby precluding the screw from ever backing out. It may be clearly seen that the handle58is free to rotate and the clearance between the sleeve88and shank20is such that, with a small amount of lubricant added to the interface, the rotation is easy and permanent.

An alternate method may also be employed which is simple and easy, however it does not have the robust and durable features as the preferred embodiment. The handle58in the second method is rotatably held in place by a round retaining ring60, which interfaces with an internal groove62in the handle and an external groove64in the shank20. These items are well known in the art for attachment of handles to tools. The handle58may be cylindrical, as shown inFIGS. 1–3and11, or contoured, as illustrated inFIGS. 12–14and18,19and20.

During use, the hinged socket wrench speed handle may be utilized in two separate ways. First, when fastening a bolt or nut, an appropriate socket is attached and the hinge pin40is pushed to the side, with the removable head52contiguous with the clevis28. The workpiece is started on its threads manually or inserted into the socket and rotated by spinning the offset handle in a circular direction. When the workpiece is snug, the tool is pushed downward to a convenient position in a single smooth motion. Tightening is then completed by rotation at the appropriate angle, using the handle as a lever arm. The second way of utilizing the hinged socket wrench speed handle is to lock the drive head30in place by manually pushing the pin40until the rivet head78or hinge pin stop82is adjacent to the clevis28, and using the tool as a flex handle or a bull handle.

The second embodiment of the invention is illustrated inFIGS. 12–14,17–20and23, and is basically the same as the preferred embodiment except a second clevis28is added to the second end24of an offset shank20a. The offset shank20ais shown by itself inFIG. 17, and the clevis28is identical, however the bends26are a full 90-degrees and the overall length is illustrated shorter than the drawings of the preferred embodiment. The difference in configuration as it will be noted that the angles may be from 10 to 90-degrees and the length is of little importance, as it depends upon the size of the drive and the wrenches ultimate utility.

A second head is mounted in the second clevis28and differs in that it attaches directly to the handle58, therefore it is designated a body head44instead of the drive head30. The body head44has the same radial shape and flat sides, including the depressions36, as the drive head, except instead of the square drive end, a cylindrical portion extends outward and interfaces with the handle58in the same manner as the second end24of the preferred shank20, as illustrated inFIG. 14. The cylindrical portion of the head44includes an internal groove62and interfaces with the same round retaining ring60, thereby permitting the handle to rotate freely on the head extended portion.

Since the body head44functions in the same manner as the square drive head30, and the same hinge pin40is utilized along with the head detent38assuring the angular position of the head, the wrench may now have the handle58adjusted to the optimum position for leverage and convenience, as illustrated inFIGS. 18–20. It will be plainly seen that the utility of the wrench, by spinning the offset handle in a circular direction to snug a workpiece, is not altered in any way, only its usefulness is enhanced by relocating the angle of the handle to best suit the particular circumstance. For example, the drive head30can be attached to one end of a straight rod, wherein the rod's opposite end has a T-handle connected which functions as a speed handle for rotating the wrench.

While the invention has been described in detail and pictorially shown in the accompanying drawings it is not to be limited to such details, since many changes and modifications may be made in the invention without departing from the spirit and scope thereof. Hence, it is described to cover any and all modifications and forms which may come within the language and scope of the appended claims.