UNIVERSAL HINGE-TYPE JOINT

Abstract: A universal living hinge joint includes an integral, preferably molded, body having first and second ends fixedly attached to first and second implement members, connecting the implement members to each other. The integral body has a plurality of substantially rigid sections and a plurality of flexible portions of reduced thickness defining non-parallel axes of rotation which separate and connect the rigid sections to each other. The integral body is bendable along the flexible portion permitting rotation of the second implement member in a wide range of angular positions with respect to the first implement member.

Description: UNIVERSAL HINGE-TYPE JOINT BACKGROUND OF THE INVENTION 1. Field of the Invention. The present invention relates to joints. In particular, it relates to joints that connect implement members allowing movement of one of the implement members in a plurality of planes. 2. Description of the Prior Art. The ability to use an implement in a variety of angular positions is quite important. However, most implements typically have the functional portion of the implement rigidly attached to the handle thereby limiting the use of the implement or resulting in an ackward use of the implement. For example, in a sanding tool, a handle is rigidly attached to a sanding tool pad. In the course of sanding drywall using an extension handle, there arises many situations in which the sanding tool has to be held in an awkward position in order to properly sand the surface of the drywall. In the prior art, there have been various attempts to solve the problem of positioning an implement in an angular position. For the most part, the solutions have been bulky and cumbersome joints that include several distinct parts that slidably engage each other. These types of joints are difficult to assemble and costly to produce, increasing the cost of the implement substantially. In addition, several parts slidably engaging each other eventually wear out over time, break or bind. Some examples of these joints are set forth in the patents briefly described below. The Bailey Patent 3,720,976 shows a toilet brush having a ball joint pivotally connecting the handle to the brush. A ball joint, of course, is an expensive type of joint and is not suitable for application in a wide variety of implements. The Johnson et al Patent 3,768,110 shows a swivel mop head having a single continuous serpentine slot disposed through a mid-portion of the body of the mop head. The portions of the mop head defined by parallel portions of the serpentine slot are capable of flexing upwardly and downwardly and angularly, providing the mop with the capability of being used in various angular positions. However, this type of joint would be quite difficult to apply to a smaller implement. Several other examples of various joints for large implements, such as mops, brooms, toilet brushes and scrubbers are discussed in the following patents: Inventor U.S. Patent No. Howell 763,loo Lewis 504,452 Allen 3,340,556 Ames 3,483,662 Bailey 3,374,498 Thielen 3,778,860 Numbers et al 3,820,187 Otconnor 4,204,295 A smaller implement having a joint is shown in the Burns et al Patent 3,369,268. A paint applicator includes a handle that is movable in one angular direction with respect to the applicator. Although the handle is movable with respect to the paint applicator, the movement is limited to just one direction. In the Polsfuss Patent 4,038,716 a paint roller is disclosed that is rotatably mounted to an axle. A handle, in turn, is pivotally attached to the axle, permitting pivotal movement in an angular direction within one plane. Again, the movement between the handle and the roller is limited to one direction in a plane. SUMMARY OF THE INVENTION The present invention includes a universal hinge-type joint for use in connecting a first and second implement member to each other, such as a sanding tool pad to a handle of a sanding tool. The joint includes -an integral body having a first end connected to the first implement member and a second end connected to the second implement member. A plurality of substantially rigid sections are defined by at least two flexible portions of reduced thickness defining non-parallel axes of rotation. The rigid sections are bendable along the flexible portions in a plurality of planes allowing rotation of the second implement membar--#n#a plurality of angular positionswith respect to the first implement member. Preferably, the integral body is substantially flat and the flexible portions include first and second score lines which bisect each other in a central portion of the flat body to form an NXH configuration and four rigid sections. Two of the four rigid sections positioned on opposite sides of the ZX" configuration include the ends which are fixedly attached to the first and second implement members. More preferably, a third score line is also provided which intersects the first and second score limes. -In one-esbodiment the third score line is positioned between the wx" configuration of the second and third score lines and the first end which is fixedly attached to the first implement member such that the flat body is additionally bendable along the third score line. Alternatively, the third score line is positioned to bisect the point of intersection of the second and third score lines and to bisect the other two rigid sections that are not attached to the first and second implement members into an additional four rigid sections. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a preferred embodiment of the universal hinge-type joint of the present invention in use in a sanding tool; Figure 2 is a side elevational view of the joint in the sanding tool; Figure 3 is a perspective view of the hinge-type joint rotated in one direction; Figure 4 is a perspective view of the hinge-type joint rotated in a direction opposite to that shown in Figure 3; Figure 5 is a perspective view of another preferred embodiment of the hinge-type joint in use in a sanding tool; Figure 6 is an enlarged fragmentary top plan view of the embodiment of Figure 5 of the hinge-type joint; Figure 7 is a side elevational view of the embodiment illustrated in Figure 5; Figure 8 is a perspective view of the preferred embodiment illustrated in Figure 5 rotated in one direction; ; Figure 9 is a perspective view of the preferred embodiment illustrated in Figure 5 rotated in a direction opposite to that shown in Figure 8. DETAILEDQDESCRIPTION OF THE PREFERREl > EMBODIMENT S The universal hinge-type joint of the present invention, generally indicated at 10, is illustrated in a preferred use in a sanding tool 12 in Figure 1. To more clearly describe the present invention, like reference characters will be used to indicate like elements throughout the figures. The sanding tool 12 includes a suitable sanding pad 14 and a handle 16. The joint 10 connects the pad 14 to the handle 16. The joint 10 includes a preferred substantially flat body 18 and first and second score lines 20, 22, defining flexible portions. The score lines, 20, 22 bisect each other in a central portion of the flat body 18, dividing the flat body 18 into four discrete substantially rigid sections 24, 26, 28 and 30. The score lines 22, 20 are a reduced thickness and sufficiently deep to allow bending of the flat body 18 along the score lines. The substantially rigid sections 24, 26, 28 and 30 provide sufficient support for motive force to be transmitted from the handle 16 to the pad 14. Preferably, a third score line 32 is positioned between the rigid section 26 and the pad 14 defining a connecting section 34 which is fixedly attached to the pad 14. The third score line 32 is also sufficiently deep to allow bending of the flat body 18 along the direction of arrow 36, as illustrated in Figure 2. The joint 10 is a unitary joint preferably made of a suitable plastic material, such as polypropylene, that allows repeated bending along the score lines 20, 22 and 32 without breaking. The score lines are disposed on both sides of the flat body and are produced by a suitable "scoring" process, or alternatively, are formed simultaneously with the flat body by suitable molding or stamping processes. 1, ¯ The movement of the universal hinge-type joint of the present invention is more fully illustrated in Figures 3 and 4. In Figure 3, the handle 16 is rotated along its axis in a direction of arrow 38 and along arrow 36, thereby bending the main body along score lines 20 and 32. When the handle 16 is rotated in a direction of arrow 40 and arrow 36, as illustrated in Figure 4, the main body 18 is bent along score lines 22 and 32. As is easily understood from the above, the rigid sections 24, 26, 28 and 30 of the main body 18 are bendable along the score lines in a plurality of planes permitting the use of the sanding tool in a wide range of angular positions. The rigid sections are rotatable along axes defined by the score lines which are non-parallel to each other and to a major axis defined by the handle 16 and the body 18 when in a non-rotated position. The universal hinge-type joint is adaptable for use with a wide variety of implements and not restricted to just sanding tools. A preferred alternative embodiment of the universal hinge-type joint of the present invention is illustrated in Figures 5-9. In Figures 5 and 6, the alternative #mb#du###it of thauniversal hinge-type joint is generally indicated at 42. The joint 42 similarly has a substantially flat body 44 which is attached at one end to the handle 16 of the sanding tool and to the pad 14 at another end. The joint 42 is similarly constructed with first and second score lines 46, 48 bisecting each other in a central portion of the flat body 44. A third score line 50 is positioned in the flat body 44 such that the third score line bisects the score lines 46, 48 at their point of intersection 52. Consequently, the score lines 46, 48 and 50 define substantially rigid sections 54, 56, 58, 60, 62 and 64,.7-Xheorigid-section-54 is fixedly attached to the handle 16 and the rigid section 60 is fixedly attached to the pad 14. The score lines 46, 48 and 50 are sufficiently deep such that the main body is bendable along the score lines with the rigid sections providing sufficient beam strength to the joint 42 for motive force to be transmitted from the handle 16 to the pad 14 for sanding. The movement of the preferred embodiment shown in Figures 5 and 6 is illustrated in Figures 7 through 9. As illustrated in Figure 7, the joint 42 is bendable along score line 50 in a direction of arrow 66 in a wide angular range. In Figure 8, the joint 42 allows the handle 16 to be rotated along its axis in a direction of arrow 68 for use in a wide range of angular positions. Alternatively, the handle 16 may be rotated in an opposite direction as indicated by arrow 70 in Figure 9. Although the joint 42 is bendable in a plurality of planes allowing use of the sanding tool in a wide range of angular positions, the rigid sections 54, 56, 58, 60, 62 and 64 provide sufficient beam strength such that motive force is transmitted from the handle 16 to the pad 14 for easy sanding of a drywall or other surface. Another alternative embodiment (not shown) of the present invention includes a joint of substantial thickness. The joint is bendable along flexible portions of reduced thickness which define the rigid sections of the joint. The flexible portions are preferably V-shaped notches. A pair of V-shaped notches, located on opposite sides of the body, project inwardly into the body of the joint and for a flexible portion. A second pair of V-shaped notches is located in a non-parallel relationship to the previous pair of notches for forming a second flexible joint. Preferably, the two flexible portions are located such that their axis of rotation are substantially perpendicular to each other. Other V-shaped notches may be added to form more flexible portions which increase the angular range of rotation of the joint. The present invention is not limited to sanding tools but may be included in a wide variety of implements including such implements as paint applicators. In addition, a larger embodiment of the hinge is usable, for example, in toilet bowl brushes, mops and other implements that are slid along a surface. Further, alternative embodiments of the present invention can be used to transmit power such as in a power train of small motors and in small tools where the transfer of power in an angular direction is desired. CONCLUSION The universal hinge-type joint of the present invention is a significant improvement over prior art joints for permitting use of implements in various angular positions. First, the joint is an integral unit, less prone to failure over time, and very inexpensive to manufacture. Second, the joint being made of a light plastic material does not significantly add to the weight of the implement. Third, the joint is adap hle¯or useii-n a great variety of implements, permitting use of such implements in a wide range of angular positions. Although the present invention has been described with reference to preferred embodiments, workers skilled in the art will recognize that changes may be made in form and detail without departing from the spirit and scope of the invention. For example, although the fixed attachments of joints 10 and 42 to handle 10 and to the pad were illustrated as permanent bonds, the present invention is equally applicable to tools in which a releasable connection is made between -the #oin# and- either the handle or the tool -head, or both. This releasable connection may, for example, be in the form of a snap lock connector, part of which is carried by the joint and the other part of which is carried by the member to which the joint is connected.

Claims: CLAIMS 1. A joint in combination with a first implement member and a second implement member, the joint being characterised by : an integral body having a first end for connection to the first implement member and a second end for connection to a second implement member and having a plurality of substantially rigid sections and a plurality of flexible portions reduced thickness defining non-parallel axes of rotation separating and connectingthe rigid sections to each other, the substantially rigid sections being bendable along the flexible portions such that the integral body is bendable in at least two planes allow ing rotation of the second implement member in a wide range of angular positions with respect to the first implement member. 2. A joint as claimed in Claim 1 characterised in that the integral body is made of a moulded plastic material. 3. A joint as claimed in Claim 1 or Claim 2 characterised in that the integral body is substantially flat and wherein the flexible portions are score lines. 4. A joint as claimed in Claim 3 characterised in that the score lines intersect each other. 5. A joint as claimed in Claim 4 characterised in that two of the two score lines intersect each other proximate a central portion of the flat body in an "X" configuration and define first,second,third and fourth substantially rigid sections. 6. A joint as claimed in Claim 5 characterised in that the first and third rigid sections are on opposite sides of the "X" configuration and further including a third score line positioned between the first rigid section and the first end of the flat body such that the flat body is additionally bendable along the third score line. 7. A joint as claimed in Claim 5 characterised in that it further includes a third score line positioned to intersect the first and second score lines to bisect at least two rigid sections such that the flat body is additionally bendable along the third score line. 8. A joint as claimed in any one of the preceding claims characterised in that the second implement member and the integral body define a major axis when in a non rotating position and wherein at least two substantially rigid sections rotate along two non- parallel axes which are non-parallel to the major axis. 9. A universal joint for connecting a first member and a second member, the universal joint being characterised by a substantially flat body having a first end for connection to the first member, a second end for connection to the second member, and having a plurality of substan tially rigid sections defined by a plurality of intersecting score lines,the flat body being bendable about a plurality of independent axes defined by the intersecting score lines to allow a range of angular positions of the first member wit h respect to the second member in a plurality of planes. 10. A universal joint as claimed in Claim 9 characterised in that the plurality of intersecting score lines includes first and second score lines which intersect to form an "X" configuration and a third score line which intersects the first and second score lines.

Inventors: GOLDSTEIN, EDWARD J.
Applicants: PADCO INC.
Application year: 1983
Main classification: B25G3
IPC codes: B25G3, F16C11, B29C53, B29C37