Abstract
A cord lock has a housing with an interior cavity and an opening extending between the front and the back for receiving a cord, and an actuator having two legs that are configured to slide within the interior cavity of the housing. A spring is disposed between the housing and the actuator to bias the actuator in a raised position relative to the housing. There is a cam disposed in the interior cavity of the housing. The bottom of the cam is rotatably connected to the housing and the top is rotatably connected to the legs of the actuator. In a resting position, the spring presses the top of the cam against the housing such that when a cord is extended through the opening, the cam locks the cord in place between the cam and the housing. Depressing the actuator compresses the spring and rotates the cam.
Claims
1. A cord lock comprising: a housing having two side walls with protrusions extending from exterior surfaces of the side walls, a top surface, a bottom surface, a front, a back, an interior cavity and an opening extending between the front and the back for receiving a cord, a cam disposed in the interior cavity, the cam having a channel therethrough, an actuating hook and a gripping portion; a post extending through the channel in the cam and being rotatably connected to the side walls of the housing; a spring connected to the post and being configured for biasing the cam in a locked position, such that a cord extending through the opening is pressed against the housing by the gripping portion of the cam; an actuator having a cross-bar configured for arrangement in the actuating hook, and a handle arranged opposite the cross-bar, wherein the protrusions form pivot points for the actuator, such that pressing the handle causes the actuator to rotate around the protrusions, and move the cam out of the locked position to release the cord from the housing.
2. The cord lock according to claim 1, wherein the spring is a torsion spring that extends around the post.
3. The cord lock according to claim 2, wherein the channel has a slot that is configured for accommodating an end of the torsion spring.
4. The cord lock according to claim 1, wherein the gripping portion contains a plurality of teeth.
5. The cord lock according to claim 1, wherein the post extends through apertures in the side walls of the housing.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
(1) Other objects and features of the present invention will become apparent from the following detailed description considered in connection with the accompanying drawings. It is to be understood, however, that the drawings are designed as an illustration only and not as a definition of the limits of the invention.
(2) In the drawings, wherein similar reference characters denote similar elements throughout the several views:
(3) FIG. 1 shows a cross sectional view of a traditional cord locking device according to the prior art;
(4) FIG. 2 shows one embodiment of the cord lock according to the invention with the cam removed;
(5) FIG. 3 shows a side view of the cord lock;
(6) FIG. 4 shows a front view of the cord lock;
(7) FIG. 5 shows an exploded view of the cord lock;
(8) FIG. 6 shows a cross-sectional view along lines A-A of FIG. 4;
(9) FIG. 7 shows the cross-sectional view of FIG. 6 with a cord inserted therein;
(10) FIG. 8 shows a perspective view of a second embodiment of the cord lock according to the invention;
(11) FIG. 9 shows a front view of the cord lock of FIG. 8;
(12) FIG. 10 shows a rear view of the cord lock of FIG. 8;
(13) FIG. 11 shows a cross-sectional view along lines B-B of FIG. 10;
(14) FIG. 12 shows a third embodiment of the cord lock according to the invention;
(15) FIG. 13 shows an exploded view of the components of the cord lock of FIG. 12;
(16) FIG. 14 shows a front view of the cord lock of FIG. 12; a
(17) FIG. 15 shows a cross-sectional view along lines C-C of FIG. 14; and
(18) FIG. 16 shows the view of FIG. 15 in a released position.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
(19) Referring now in detail to the drawings and, in particular, FIG. 1 shows a prior art cord lock 1, which has a housing 2 and an actuator 3 that is held in a biased position by a spring 4. A cord 100 extends through a hole in the housing, and the biased force of actuator 3 keeps cord 100 in position. The problem with this arrangement is that it is relatively easy to overcome the force of the spring, as lateral force on the cord runs perpendicular to the spring force.
(20) One embodiment of the cord lock according to the invention is shown in FIGS. 2-7. Here, cord lock 10 comprises a housing 11 having an interior cavity 12, side walls 13 and a front 14 with an opening 15. An actuator 20 is positioned on the top of housing 11, and has legs 21 that slide within side walls 13 of housing 11. Side walls 22 of actuator 20 slide up and down in an indentation 18 in the outside of side walls 13, so that side walls 13 of housing 11 fit within a groove 23 of actuator 20, to keep actuator 20 in position on housing 11. A spring 30 is mounted on a post 16 of housing 11, and rests against the underside of actuator 20. In a resting position, spring 30 biases actuator 20 in a raised position. Spring 30 is a compression spring that can be compressed by pressing downward on actuator 20.
(21) A cam 40 is connected to both the housing 11 and actuator 20. As shown in FIG. 5, cam 40 has protrusions 41, 42 on each of its side walls 43. Protrusions 42 extend through apertures 17 in housing 11, and protrusions 41 extend through apertures 26 in actuator 20, to rotatably connect cam 40 to housing 11 and actuator 20. When the cord lock 10 is fully assembled, cam 40 is arranged so that the bottom is offset from the top, leading to an oblique arrangement of cam 40 in housing 11, as can be seen in FIGS. 6 and 7. In a resting position as shown in FIG. 6, the pressure of spring 30 keeps actuator 20, and consequently cam 40, in a fully raised position, where cam 40 is essentially completely blocking opening 15. The offset orientation of cam 40 means that the lateral motion of actuator 20 up and down causes cam 40 to rotate about the pivot points created by projections 41 and 42. This arrangement, as shown in FIG. 7, allows a cord 100 to be locked in place in cord lock 10. The upward pressure on cam 40 keeps cord 100 firmly in place. Teeth 44 dig into cord 100 and keep it from slipping. Any lateral force to the right as shown by the arrow only causes cam 40 to rotate toward a more vertical position and secure cord 100 even more firmly in place. To release cord 100, the user must press down on actuator 20, which then causes cam 40 to rotate counter-clockwise to achieve a more horizontal position, and open up space in opening 15 for cord 100 to slide free.
(22) An alternative embodiment of the cord lock is shown in FIGS. 8-11. Here, cord lock 80 is essentially two of cord locks 10 from FIGS. 2-7 that are put together into a single unit. As shown in FIG. 8, cord lock 80 comprises a housing 81 with two interior cavities 82 that house cams 90, which are rotatably connected to housing 81 and actuators 110 in the same manner as described with respect to FIGS. 2-7. Apertures 84, 85 in housing 81 accommodate corresponding protrusions in cam 90 to rotatably hold cam 90 in place. Actuators 110 each have legs 111 that extend into housing 81 to connect with the top portion of cams 90. Compression springs 95 keep cams 90 in a biased position, to hold two cords simultaneously in position in cord lock 80. Cams 90 are positioned so that the tops of cams 90 face away from each other, and they rotate in opposite directions upon pressing of actuators 110, as shown in FIG. 11. This allows actuators 110 to be pressed simultaneously by squeezing them together, which can be done by a single hand. As with the first embodiment, cams 90 can be equipped with teeth 96 for better gripping of the cords.
(23) Another embodiment of the invention is shown in FIGS. 12-16. Here, cord lock 200 is formed from a housing 210 having an interior cavity 220 in which a cam 230 is rotatably mounted on a post 240. Post 240 extends through channel 231 in cam 230, and through apertures 222, 223 in housing 210 to mount cam 230 to housing 210. Channel 231 has a cutout 234 for accommodating the end 251 of torsion spring 250, which extends around post 240 and keeps cam 230 in a biased position in cavity 220 of housing 210. This biased position is shown in FIG. 15, where teeth 233 of cam 230 are shown abutting the top of housing 210. A cord (not shown) can be extended between teeth 233 and the top of housing 210 maintained there under pressure by spring 230. Attempts to pull a cord to the right only cause cam 230 to rotate into an even further locked position and prevent all movement of a cord.
(24) To enable adjustment of the cord, an actuator 260 is connected to cam 230, by placing bar 262 of actuator 260 underneath hook 232 of cam 230. Then, edges 264 of actuator 260 rest on protrusions 225 of housing 210. Protrusions 225 act as pivot points for actuator 260, so that pressing down on handle 261 of actuator 260, causes actuator 260 to rotate around protrusions 225, raising bar 262, and thereby causing cam 230 to rotate to an open position, as shown in FIG. 16. This allows a cord to be adjusted or removed, before releasing actuator 260 and cam 230 back into the resting biased position shown in FIG. 15.
(25) Accordingly, while only a few embodiments of the present invention have been shown and described, it is obvious that many changes and modifications may be made thereunto without departing from the spirit and scope of the invention.
