Adjustable Tension Rod

FIELD

The present invention relates generally to an adjustable tension rod and, more particularly, to an adjustable tension rod that installs in a more convenient manner.

BACKGROUND

Adjustable tension rods are commonly used to support curtains, such as shower curtains. Adjustable tension rods commonly have two tubes where one slides inside the other one to adjust the relative length of the combined tubes. The tensions rods include a locking system to set the tubes relative to one another and adjustable end caps to apply the appropriate amount of pressure on a pair mounting walls between which the rod extends. This will secure the rod in place.

Known shortcomings with current tension rods include their difficulty to install. For example, they commonly require movement of one's hands to a different position on the rod during installation. That is, one uses one position to adjust the tubes relative lengths and another position to adjust the end caps. This latter adjustment commonly requires going to one or both ends of the rod to adjust the end caps, while still having to hold the rod from one end so that it does not slide relative to the mounting walls. This process tends to permit the rod to slip on the walls and be installed in an out of level manner.

Thus, there exists the need for an improved adjustable tension rod that is more easily installed in a level manner.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a tension rod in accordance with a preferred embodiment of the present invention;

FIG. 2 is longitudinal cross-section showing an adjustment mechanism for the tension rod of FIG. 1;

FIG. 3 is a perspective view of an insert of a lock assembly of the adjustment mechanism of FIG. 2;

FIG. 4 is a top plan view of the insert of FIG. 3;

FIG. 5 is a perspective view of the insert of FIG. 3 with a lock disc attached thereto;

FIG. 6 is a top plan view of the lock disc of FIG. 5;

FIG. 7 is a perspective view down an inside of an inner tube of the tension rod of FIG. 1 showing the insert of the lock assembly of FIG. 3;

FIG. 8 is a perspective view down an inside of an outer tube of the tension rod of FIG. 1 showing the lock disc of FIG. 6;

FIG. 9 is a perspective view of a left end cap of the adjustment mechanism of FIG. 2;

FIG. 10 is a perspective view of a right end cap of the adjustment mechanism FIG. 2;

FIG. 11 is a perspective view of a left end cap adjustment screw insert of the adjustment mechanism FIG. 2;

FIG. 12 is a perspective view of a right end cap adjustment screw insert of the adjustment mechanism FIG. 2;

FIG. 13 is a perspective view of a left end outer tube insert of the adjustment mechanism FIG. 2;

FIG. 14 is a perspective view of a right end inner tube insert of the adjustment mechanism FIG. 2;

FIG. 15 is a cross-section view of an alternative adjustment mechanism for the tension rod of FIG. 1;

FIG. 16 is a perspective view of a lock assembly for the alternative adjustment mechanism of FIG. 15;

FIG. 17 is a perspective view of a lock ramp of the lock assembly of FIG. 16;

FIG. 18 is a perspective view of an inner tube left end insert of the lock assembly of FIG. 16;

FIG. 19 is a perspective view of a lock sleeve of the lock assembly of FIG. 16;

FIG. 20 is a cross-section view of an alternative adjustment mechanism for the tension rod of FIG. 1;

FIG. 21 is a cross-section view of a lock assembly for the alternative adjustment mechanism of FIG. 20;

FIG. 22 is an exploded cross section view of the lock assembly of FIG. 21;

FIG. 23 is a cross-section view of an alternative end cap assembly for the tension rod of FIG. 1;

FIG. 24 is a cross-section view of the end caps for the assembly of FIG. 23;

FIG. 25 is a cross-section view of the screw inserts for the assembly of FIGS. 23; and

FIG. 26 is a cross-section view of the tube inserts for the assembly of FIG. 23.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

With reference to FIG. 1, there is illustrated a universal tension rod 10 designed to be easily installed between two walls to support hanging items, such as for supporting a shower curtain in a shower enclosure. The shower rod adjusts in length from a contracted length to an extended length to accommodate different distances between the mounting walls. Once adjusted to a level distance between the mounting walls, the tension rod if further adjusted to apply the appropriate amount of force on the walls to facilitate sufficient supporting strength. The adjustment mechanisms described herein permits simple installation of the tension rod without having to move one's hands along the rod during installation and without undesired walking of the ends of the rod on the mounting wall.

More specifically, the tension rod 10 includes an inner tube 12 partially received in an outer tube 14. The inner tube 12 extends telescopically from the outer tube 14 to provide a coarse adjustment of the rod 10 to engage the mounting walls. The outer tube 14 includes a left end cap 16, and the inner tube 12 includes a right end cap 18. The end caps 16, 18 adjust relative to their respective tubes 14, 12 to provide fine adjustments to further apply force against the mounting walls. These adjustments, as explained further below, place the rod 10 in sufficient tension between the mounting walls to enable the rod 10 to support items such as a shower curtain.

With reference to FIGS. 2-14, there is illustrated one embodiment of an adjustment mechanism for the tension rod 10. The adjustment mechanism includes a lock assembly 20 intermediate the end caps 16, 18 to lock the inner and outer tubes 12, 14 relative to one another for the coarse adjustment. The adjustment mechanism further includes a left end cap adjustment assembly 22 and a right end cap adjustment assembly 24. The end cap adjustment assembles 22, 24 provide the fine adjustments to apply the appropriate amount of force against the mounting walls. For the adjustment mechanism of FIG. 2, the inner and outer tubes 12, 14 are roll formed from metal with a longitudinal folded seam along the inside to secure the rounded cross-section (see FIGS. 7 and 8).

The lock assembly 20 includes a lock assembly insert 26 that fits in an inner end portion 28 of the inner tube 12 such that it is fixed against movement relative to the inner tube 12 and a lock disc 30 that is attached to an outer end 32 of the insert 26 that extends beyond an end 34 of the inner tube 12. The lock disc 30 engages an inside surface 36 of the outer tube 14 to enable the tubes 12, 14 to be extended relative to another but not contracted once extended.

With reference to FIGS. 3 and 4, the lock assembly insert 26 has a cylindrical, hollow body configuration with a flat end wall 38 at one end surrounded by a perimeter flange 40 extending radially from the insert 26. The flange 40 engages the end 34 of the inner tube 12 as a stop against complete insertion into the inner tube 12. The flat end wall 38 includes a central threaded bore. The threading may be provided by a metal insert 41 friction fitted into the bore in the flat end wall 38. The outer diameter of the insert 26 is such that it provides a friction fit with an inner surface 42 of the inner end portion 28 of the inner tube 12 to resist unintentional removal from the inner tube 12. The insert 26 includes a longitudinal groove 44 extending the entire length for receiving a folded seam 46 (FIG. 7) to resist rotation of the lock assembly relative to the inner tube 12. The insert 26 also may include a circumferential groove 48 near an inner end 23 of the insert 26. The circumferential groove 48 may be used to further secure the insert 26 in the inner tube 12. A portion of inner tube at the groove 48 can be indented into to the groove 48 to provide an interlocking engagement. The insert may be made, such as molded, from a rigid plastic material.

With reference to FIGS. 5 and 6, the lock disc 30 is attached to the flat end wall 38 of the insert 26 with a threaded screw 50 in into the central threaded bore 41. The lock disc 30 includes a series of radials slits 52 that define a series of petals 54 with an arcuate outer edge 56. A seam cutout 55 is located at one of the slits 52. The seam cutout 55 receives the folded seam 57 of the outer tube 12 (FIG. 8).

The petals 54 enable the lock disc 30 to take on a concave shape facing into the outer tube 14 (FIG. 2). The diameter of the lock disc 30 is sufficiently large so that the outer arcuate edge 56 of the petals 54 engages the inner surface 36 of the outer tube 14. The concave shape enables the petals 54 to slide along the inner surface 36 as the inner and outer tubes 12, 14 are extended relative to one another but wedges against the inner surface 36 to prevent contraction of the inner tube 12 into the outer tube 14. This provides a one way slip lock configuration for the coarse extension of the tubes 12, 14 relative to one another between the mounting walls. The lock disc 30 is preferably made of a metal material, such as spring steel, that retains its shape and of sufficient integrity to lock against the inner wall 36 of the outer tube 14.

The left and right end cap assemblies 22, 24 are the same except that they are threaded so the rotation of both the inner and outer tubes 12, 14 in the same direction causes both the left and right end caps 16, 18 to translate in opposite directions with respect to one another. That is, rotation of the tubes 12, 14 in clockwise direction when looking at the right end cap 18 causes the end caps 16, 18 to translate away from one another (outward) to apply pressure on the mounting walls to secure the tension rod 10 and when rotated in the counterclockwise direction, the end caps 16, 18 move toward each other to release the tension rod 10 from the mounting walls. During installation, one simply pulls the tubes 12, 14 apart to the desired length between the mounting walls and without moving their hands begins to turn the tubes 12, 14 together in the clockwise direction (i.e., toward their body) to translate the end caps 16, 18 outward to apply pressure on the mounting walls to secure the tension rod 10.

With reference to FIGS. 9 and 10, the left end cap 16 and the right end cap 18 are identical. The end caps 16, 18 each include an end wall 62 with an outer surface 64 that is generally flat, a tapering outer surface 66 extending away from the outer surface 64 to the other end of the end cap, and a cylindrical, hollow interior 68. A driver 70 projects from a center of the end wall into the interior 68 of the end cap. The driver 70 may be hexagonal in form. The end caps 16, 18 may be made a rubber type material designed to provide a friction engagement with the mounting walls to prevent the end caps from rotating and walking on the mounting walls during rotation of the tubes for installation.

With reference to FIGS. 11 and 12, the left and right end cap assemblies 22, 24 include a left and right end cap adjustment screw insert 72, 74, respectively. A head 76 of each screw insert 72, 74 includes a drive socket 78 to receive the driver 70 of the end caps 16, 18. The socket may be hexagonal in configuration. The diameter of the head 76 is sized to provide a friction fit with an inner surface 80 of the interior 68 (FIG. 10) of the end caps 16, 18. The left end cap adjustment screw insert 72 includes right hand threading 82, and the right end cap adjustment screw insert 74 includes a left hand threading 84. The left and right end cap adjustment screw inserts 72, 74 may be made, such as molded, from a rigid plastic material.

With reference to FIGS. 13 and 14, the left and right end cap assemblies 22, 24 include a left and right end tube insert 86, 88, respectively. Each insert 86, 88 is generally cylindrical with a hollow pass through 90. The left end cap insert 86 fits with a friction fit in a left end 94 of the outer tube 14, and the right end cap insert 88 fits in a right end 96 of the inner tube 12 with a friction fit (FIG. 2). An outer diameter of the left end cap insert 86 is slightly larger than that of the right end cap insert 88 to accommodate a larger diameter of the outer tube 14. A circumferential flange 92 extends about the perimeter of one end of the left and right end cap inserts 86, 88 for engaging the left and right ends 94, 96 of the outer and inner tubes 14, respectively, to prevent complete insertion therein. Each insert 86, 88 includes a longitudinal extending groove 98 that receives the outer tube seam 57 and the inner tube seam 46, respectively. This engagement fixes the left and right end tube inserts 86, 88 for rotation with the outer and inner tubes 14, 12 during installation.

The left end cap insert 86 includes a left hand thread 100 in its interior 90, and the right end cap insert 88 includes a right hand thread 102 in its interior 90. The right and left hand threads 100, 102 cooperate with the right and left hand threading 82, 84 of the right and left end cap adjustment screw inserts 72, 74. These threading engagements enable the end caps 16, 18 to move away from one another as the tubes 12, 14 are rotated during installation. More specifically, the friction between the mounting walls and the end surfaces 64 of the end caps 16, 18 limits rotation of the end caps 16, 18 as the tubes 12, 14 are rotated. The driver 70 of the end caps 16, 18 and the sockets 78 lock the left and right end cap adjustment screw inserts 72, 74 against rotation relative to the end caps 16, 18. Accordingly, as the tubes 12, 14 are rotated toward an installer, the left and right end tube inserts 86, 88 are turned causing the end caps 16, 18 to move away from one another, thereby applying force on the mounting surface to further lock the tension rod 10 to the mounting walls. Rotating the tubes 12, 14 away from the installer causes the end caps to move towards one another, thereby removing force from the mounting surface to uninstall the tension rod 10. The left and right end cap inserts may be made, such as molded, from a rigid plastic material.

To install the tension rod 10 with the locking mechanism 20 and the left and right end cap adjustment assemblies 22, 24, the outer tube 14 is held with one's left hand, and the inner tube 12 is held with one's right hand. The tubes 12, 14 are extended from one another until their respective end caps 16, 18 engage the mounting walls. Next, one rotates both the inner and outer tubes 12, 14 in the same direction toward one's body (i.e., clockwise looking at the right end cap 18). This will cause the end caps 16, 18 to move away from another to provide the appropriate force on the mounting walls to secure the tension rod 10. The tubes 12, 14 can be rotated in the opposite direction to release the pressure to remove the tension rod 10, such as for repositioning.

With references to FIGS. 15-19, there is illustrated another embodiment of an adjustment mechanism for the tension rod 10. The adjustment mechanism includes a lock assembly 220 intermediate the end caps 16, 18 to lock the inner and outer tubes 12, 14 relative to one another for the coarse adjustment. The adjustment mechanism further includes a left end cap adjustment assembly 222 and a right end cap adjustment assembly 224. The end cap adjustment assemblies 222, 224 provide the fine adjustments to apply the appropriate amount of force against the mounting walls. The end cap assemblies 222 and 224 are identical to the end assemblies 22 and 24 discussed above. For the adjustment mechanism of FIG. 15, the inner and outer tubes 12, 14 are roll formed from metal with a longitudinal welded seam along the inside to secure the rounded cross-section.

With reference to FIGS. 16-19, the lock assembly 220 includes a lock ramp 226, an inner tube left end insert 228, and a lock sleeve 230. The lock ramp 226 and the inner left end insert 228 may be molded from a rigid plastic material. The lock sleeve 230 also may be molded from rigid type plastic but must be flexible enough to expand and provide a sufficient frictional engagement with an inner surface of the outer tube to lock the tubes against relative movement.

The lock ramp 226 includes a frusto-conical wedge portion 232 and a threaded portion 234 with a right hand thread 236. The wedge portion 232 includes a circumferential flange 238 at its free end and a pair of diametrically opposed grooves 240 extending longitudinally from the flange 238 to the threaded portion 234. The flange 238 centers the lock ramp 226 in the outer tube 14 and provides a small amount of frictional engagement with an inner surface 242 of the outer tube 14. The longitudinal grooves 240 guide longitudinal movement of the lock sleeve 230 along the wedge portion 232.

The inner tube left end insert 228 is generally a hollow cylindrical with a through hole 244. The insert 228 fits with a friction fit in a left end 246 of the inner tube 12. A circumferential flange 248 extends about a perimeter of one end of the insert 228 for engaging the left end 246 of the inner tube 12 to prevent complete insertion therein. The friction engagement in the inner tube 12 fixes the insert 228 against rotation relative to the inner tube. The insert 228 includes a left hand thread 250 in its interior. The thread 236 of the threaded portion 234 of the lock ramp 226 meshes with the thread 250 of the insert 228. As the threaded portion 234 is turned into the insert 228 the lock sleeve 230 expands to lock to tubes 12, 14 relative to one another.

More specifically, the lock sleeve 230 has an elongated slot 252 its entire axial length to form a split ring configuration. This enables the lock sleeve 230 to be expanded from a first state that allows relative movement of the tubes 12, 14 to a second state to lock the tubes 12, 14 against relative movement. The lock sleeve 230 includes a pair of longitudinally extending ribs 254 on its inside that are offset 90 degrees from the slot 252. The lock sleeve 230 receives the wedge portion 232 of the lock ramp 226 with the ribs 254 each in one of the grooves 240 of the lock ramp.

To install the tension rod 10 with the locking mechanism 220 and the left and right end cap adjustment assemblies 222, 224, the outer tube 14 is held with one's left hand, and the inner tube 12 is held with one's right hand. The tubes 12, 14 are extended from one another until their respective end caps 16, 18 engage the mounting walls. Then, the outer tube 14 is held stationary with the left hand, and the inner tube 12 is rotated clockwise (when looking at the right end cap 18—i.e., toward an installer's body) with the right hand. This causes the threaded engagement between the lock ramp 226 and the insert 228 to draw the wedge portion 232 toward the insert 228 which, in turn, causes the wedge portion 232 to push into the lock sleeve 230 guided by the grooves 240 and ribs 254 and expand the lock sleeve 230. Once expanded sufficiently, the lock sleeve 230 becomes wedged tightly between the wedge portion 232 and the inner surface 242 of the outer tube 14 causing the inner and outer tubes 12, 14 to be locked against relative movement.

Next, one rotates both the inner and outer tubes 12, 14 in the same direction toward the one's body (i.e., clockwise looking at the right end cap 18). This will cause the end caps 16, 18 to move away from another to provide the appropriate force on the mounting walls to secure the tension rod 10. The tubes 12, 14 can be rotated in the opposite direction to release the pressure to remove the tension rod 10, such as for repositioning.

With reference to FIG. 20, there is illustrated another embodiment of an adjustment mechanism for the tension rod 10. The adjustment mechanism includes a lock assembly 320 intermediate the end caps 316, 318 to lock the inner and outer tubes 12, 14 relative to one another for the coarse adjustment. The adjustment mechanism further includes a left end cap adjustment assembly 322 and a right end cap adjustment assembly 324. The end cap adjustment assemblies 322, 324 provide the fine adjustments to apply the appropriate amount of force against the mounting walls. The end cap assemblies 322 and 324 are identical to the end cap assemblies 422 and 424 discussed below. The end caps 316 and 318 are identical to the end caps 416 and 418 discussed below. In alternative embodiments, the end cap assemblies 322 and 324 can be replaced with the end cap assemblies 22 and 24 discussed above and the end caps 316 and 318 are replaced with the end caps 16 and 18 discussed above. For the adjustment mechanism of FIG. 20, the inner and outer tubes 12, 14 are roll formed from metal with a longitudinal welded seam along the inside to secure the rounded cross-section. This can be done with a laser to provide a smooth interior and exterior.

With reference to FIGS. 21-22, the lock assembly 320 includes a lock ramp 326, an inner tube left end insert 328, and a lock sleeve 330. The locking assembly 320 operates very similarly to the locking assembly 220 described above. Corresponding parts in the two embodiments share the same last two digits in the reference numbers. The lock ramp 326 and the inner left end insert 328 may be molded from a rigid plastic material, such as acrylonitrile butadiene styrene (ABS). The lock sleeve 330 also may be molded from rigid type plastic (such as ABA) but must be flexible enough to expand and provide a sufficient frictional engagement with an inner surface of the outer tube to lock the tubes against relative movement.

The lock ramp 326 includes a frusto-conical wedge portion 332 and a threaded portion 334 with a right hand thread 336. The wedge portion 332 includes a groove 340 extending longitudinally from its free end (the left end in FIGS. 20-21) to the threaded portion 334.. The longitudinal groove 340 guides longitudinal movement of the lock sleeve 330 along the wedge portion 332. In alternative embodiments, the lock ramp 326 may include a flange at its free end to help center the lock ramp 326 in the outer tube 14 and provides a small amount of frictional engagement with an inner surface 342 of the outer tube 14.

The lock ramp 326 further includes an annular groove 321 at the end of the threaded portion 334. The annular groove 321 is defined by the threaded portion 334 and a truncated cone 323. The truncated cone 323 decreases in diameter further from the annular groove 321 and as it proceeds to its terminal end. It is made out of a deformable material, so that a stop washer 325 can be pushed over the truncated cone 323 to rest in the annular groove 321. The wide end of the truncated cone 323 prevents the stop washer 325 from separating from the lock ramp 326. The stop washer 325 has an outer diameter greater than the inner diameter of the insert 328, and thus prevents the insert 328 and the lock ramp 326 from being separated.

In assembly, the lock ramp 326 is extended though the lock sleeve 330 and the left end insert 328 so that the truncated cone 323 extends out the end of the left end insert 328 furthest from the frusto-conical wedge portion 332 of the lock ramp 326. The stop washer 325 is then mounted onto the lock ramp 326. The cam surface of the truncated cone 323 deforms to allow the stop washer 325 to slip over the edge and into the annular groove 321. The stop washer 325 may be made of a plastic (such as ABA) so that the inner edge of the stop washer 325 deforms to assist with installing of the stop washer 325 on to the end of the lock ramp 320. Once in the annular groove 321, the stop washer 325 abuts the edge of the wide stop surface of the truncated cone 323. The wide edge of the truncated cone 323 is only slightly, but sufficiently, larger than the hole in the stop washer 325, so as to prevent the assembly from separating while in use but still allowing easy assembly. Thus, the lock ramp 326 is installed into the insert 328 before installation of the stop washer 325.

The inner tube left end insert 328 has a generally hollow, generally cylindrical shape with a through hole 344. The insert 328 fits with a friction fit in a left end 346 of the inner tube 12. An annular flange 348 extends about a perimeter of one end of the insert 328 for engaging the left end 346 of the inner tube 12 to prevent complete insertion therein. An annular protrusion 366 extends from the annular flange 348. The protrusion 366 includes an annular neck 363 and a terminal, annular lip 364. The lip snap 364 fits into an annular groove 362 defined by the interior surface of the lock sleeve 330. This captivates the lock sleeve 330 to the insert 328. The groove 362 is deep enough so that the lip 364 does not prevent the lock sleeve 330 from contracting when the lock assembly 320 is loosened. The lip 364 extends far enough into the groove 362 that the parts do not decouple when the lock sleeve 330 is fully expanded to lock the tubes 12, 14 together. The friction engagement in the inner tube 12 fixes the insert 328 against rotation relative to the inner tube 12. In alternative embodiments, the insert 328 may include a groove that interacts with a seam of the inner tube 12 to fix the insert 328 against rotation relative to the inner tube 12. In other alternative embodiments, the inner tube 12 may be spiked to the insert 328 by causing indentation in the inner tube 12 with a punch. The insert 328 includes a left hand thread 350 in its interior. The thread 336 of the threaded portion 334 of the lock ramp 326 meshes with the thread 350 of the insert 328.

The lock sleeve 330 has an elongated slot 352 (see slot 252 in FIG. 19) along its entire axial length to form a split ring configuration. This enables the lock sleeve 330 to be expanded from a first state that allows relative movement of the tubes 12, 14 to a second state to lock the tubes 12, 14 against relative movement. The lock sleeve 330 includes a longitudinally extending rib 354 on its inside. The lock sleeve 330 receives the wedge portion 332 of the lock ramp 326 with the rib 354 received in the groove 340 of the lock ramp 326 to enable the lock sleeve to rotate with the lock ramp 326. The engagement between the groove 362 and the lip 364 allows the lock sleeve to rotate relative to the insert 328.

In an alternative embodiment, the insert 328 does not have a circumferential flange 348 sized to prevent insertion of the insert 328 entirely into the tube. In this case, the lock sleeve 330 engages the left end 346 of the inner tube 12. With the lock sleeve 330 and the insert 328 connected by the lip 364, the lock sleeve 330 can serve the purpose of the annular flange 348.

As the threaded portion 334 is turned into the insert 328, the lock sleeve 330 expands to lock to tubes 12, 14 relative to one another. As the threaded portion 334 is turned out of the insert 328 the lock sleeve 330 contracts, allowing the tubes 12, 14 to move relative to one another. The coupling of the lip 364 and the groove 362 prevent the lock sleeve 330 from moving with the frusto-conical wedge portion 332 as a result of friction when the tubes 12, 14 are free to move longitudinally relative to one another. Because the inner surface of the outer tube 14 and the outer surface of the lock sleeve 330 are smooth, minimal clearance is needed to allow movement of the tubes 12, 14 relative to each other. In one embodiment, the diameter of the lock sleeve 330 in an expanded state is between 0.0025 and 0.025 inches larger than the diameter of the lock sleeve 330 in an unexpanded state. As the tubes 12, 14 move toward one another, the annular flange 348 prevents the insert 328 from moving relative to the tube 12. As the tubes 12, 14 move apart, the friction between the insert 328 and the tube 12 prevents the insert 328 from moving relative to the tube 12. The washer 325 couples the lock ramp 326 to the insert 328 to prevent separation of the components. The engagement of the lip 364 with the groove 362 prevents the lock sleeve 330 from decoupling from the insert 328. As such, the lock assembly 320 is captivated so that adjustment of the tension rod 10 will not result in the separation of the components of the lock assembly 320.

To install the tension rod 10 with the locking mechanism 320 and the left and right end cap adjustment assemblies 322, 324, the outer tube 14 is held with one's left hand, and the inner tube 12 is held with one's right hand. The tubes 12, 14 are extended from one another until their respective end caps 316, 318 engage the mounting walls. Then, the outer tube 14 is held stationary with the left hand, and the inner tube 12 is rotated clockwise (when looking at the right end cap 318—i.e., toward an installer's body) with the right hand. This causes the threaded engagement between the lock ramp 326 and the insert 328 to draw the wedge portion 332 toward the insert 328 which, in turn, causes the wedge portion 332 to push into the lock sleeve 330 guided by the groove 340 and rib 354 and expand the lock sleeve 330. Once expanded sufficiently, the lock sleeve 330 becomes wedged tightly between the wedge portion 332 and the inner surface 342 of the outer tube 14 causing the inner and outer tubes 12, 14 to be locked against longitudinal relative movement.

Next, one rotates both the inner and outer tubes 12, 14 in the same direction toward the one's body (i.e., clockwise looking at the right end cap 318). This will cause the end caps 316, 318 to move away from another to provide the appropriate force on the mounting walls to secure the tension rod 10. The tubes 12, 14 can be rotated in the opposite direction to release the pressure to remove the tension rod 10, such as for repositioning.

With reference to FIGS. 23-26, there is illustrated another embodiment of an end cap assembly for the tension rod 10, mentioned above. The end cap assemblies 422, 424 shown in FIG. 23 can be combined in a tension rod 10 with any of the locking mechanisms discussed above.

In FIG. 24, the left end cap 416 and the right end cap 418 are nearly identical. The end caps 416, 418 each include an end wall 462 with an outer surface 464 that is generally flat, a tapering outer surface 466 extending away from the outer surface 464 to the other end of the end cap, and a cylindrical, hollow interior 468. The interior surface 468 of end cap 416 is sized to fit over the outer surface of the outer tube 14 such that friction between the interior surface 468 and outer surface of the outer tube 14 are minimized or eliminated. The interior surface of 468 also is sized to fit over the outer surface of the inner tube 12 such that friction between the interior surface 468 and outer surface of the inner tube 12 are minimized or elminated. In addition, the interior surfaces 468 can be made smooth in order to minimize friction between the end caps 464 and the tubes 12, 14.

There is an annular groove 470 in the interior 468 of the end cap at the end wall 462. The end caps 416, 418 may be made a rubber type material designed to provide a friction engagement with the mounting walls to prevent the end caps from rotating and walking on the mounting walls during rotation of the tubes for installation.

With reference to FIG. 25, the left and right end cap assemblies 422, 424 include a left and right end cap adjustment screw insert 472, 474, respectively. A head 476 of each screw insert 472, 474 includes an outer surface 478 that fits within the annular groove 470 of the end caps 416, 418. The diameter of the head 76 is sized to provide a friction fit with the annular groove 470 of the end caps 416, 418. The friction engagement between the head 476 and the annular groove 470 should be greater than any friction between the interior surface 468 of the end caps 416, 418 against tubes 12, 14. Thus, when the tension rod 10 is rotated the friction fixes the end caps 416, 418 and the screw inserts 472, 474 against rotation. This causes the screw inserts 472, 474 to unscrew from the rotating inserts 486, 488 causing the expansion of the tension rod 10 to fill the gap between the two walls. The friction between the end caps 416, 418 and the wall can vary based on the material and design of the end caps 416, 418 and/or the walls. Based on the design of the outer surface 464 of the end caps 416, 418, the surface of the head 476 and/or the interior surface 468 of the end caps 416, 418 can be altered to adjust the friction therebetween. This includes changing the materials, changing the roughness or smoothness of the surfaces, or adding features such as ridges to increase friction. The left end cap adjustment screw insert 472 includes right hand threading 482, and the right end cap adjustment screw insert 474 includes left hand threading 484. The left and right end cap adjustment screw inserts 472, 474 may be made, such as molded, from a rigid plastic material, such as ABS.

With reference to FIG. 26, the left and right end cap assemblies 422, 424 include a left and right end tube insert 486, 488, respectively. Each insert 486, 488 is generally cylindrical with a hollow pass through 490. The left end cap insert 486 fits with a friction fit in a left end 94 of the outer tube 14, and the right end cap insert 488 fits in a right end 96 of the inner tube 12 with a friction fit (see, e.g., FIG. 2). In alternative embodiments, a punch may be used to dent the tubes 12, 14 into the inserts 486, 488 after insertion in order to further secure them in place. In other alternative embodiments, the tubes 12, 14 may include a rolled seam that interacts with a groove in the inserts 486, 488 to fix the inserts 486, 488 against rotation. An outer diameter of the left end cap insert 486 is slightly larger than that of the right end cap insert 488 to accommodate a larger diameter of the outer tube 14. An annular flange 492 extends about the perimeter of one end of the left and right end cap inserts 486, 488 for engaging the left and right ends 94, 96 of the outer and inner tubes 14, respectively, to prevent complete insertion therein.

The left end cap insert 486 includes a left hand thread 491 in its interior 490, and the right end cap insert 488 includes a right hand thread 493 in its interior 490. The right and left hand threads 491, 493 cooperate with the right and left hand threading 482, 484 of the right and left end cap adjustment screw inserts 472, 474. These threading engagements enable the end caps 416, 418 to move away from one another as the tubes 12, 14 are rotated in the same direction during installation. More specifically, the friction between the mounting walls and the end surfaces 464 of the end caps 416, 418 limits rotation of the end caps 416, 418 as the tubes 12, 14 are rotated. The friction between the interior surface 468 of the end caps 416, 418 and the outer surface 478 of the adjustment screw inserts 472, 474 lock the left and right end cap adjustment screw inserts 472, 474 against rotation relative to the end caps 416, 418. Accordingly, as the tubes 12, 14 are rotated toward an installer, the left and right end tube inserts 486, 488 are turned causing the end caps 416, 418 to move away from one another, thereby applying force on the mounting surface to further lock the tension rod 10 to the mounting walls. Rotating the tubes 12, 14 away from the installer causes the end caps to move towards one another, thereby removing force from the mounting surface to uninstall the tension rod 10. The left and right end cap inserts may be made, such as molded, from a rigid plastic material, such as ABS.

It will be understood that various changes in the details, materials, and arrangements of parts and components which have been herein described and illustrated in order to explain the nature of the tension rod may be made by those skilled in the art within the principle and scope of the tension rod as expressed in the appended claims. Furthermore, while various features have been described with regard to particular embodiments, it will be appreciated that features described for one embodiment also may be incorporated with the other described embodiments.

	Number	Date	Country
Parent	14202859	Mar 2014	US
Child	15081432		US

Adjustable Tension Rod

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CPC

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Abstract

Description

Claims

CROSS REFERENCE TO RELATED APPLICATIONS

Provisional Applications (1)

Continuation in Parts (1)