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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7971316 | Door closer assembly A door closer assembly is provided, including a valve regulating an amount of hydraulic fluid that flows through the valve. The amount of hydraulic fluid flowing through the valve controls a force generated by the door closer assembly on a door. A first sensor measu... | 07/05/2011 |
| 7788768 | Door closer A door closer that integrally incorporates a door-opening-assistance device, and that therefore eliminates the need for unnecessary troublesome adjustment between parts, and whose number of parts is reduced, making said door closer compact. The door closer 1 ... | 09/07/2010 |
| 7624476 | Automatic closing assembly for a sliding door An automatic closing assembly for a sliding door has a base, an adjusting device and a housing. The base is mounted on the sliding door and has a mounting bracket and a connecting frame. The connecting frame is mounted on the mounting bracket and has a damper barrel... | 12/01/2009 |
| 7571515 | Drive system for a door or window and method of operating same A drive system for a moveable wing, especially for a door or a window, is described. The drive system includes at least one energy storage device by whose discharge of energy the wing is moved. The energy storage device is hereby controllable in its energy discharge... | 08/11/2009 |
| 7464437 | Door closer The apparatus for closing the door slowly and automatically can directly get the door closed by the piston rod without passing through a gear, so that the energy loss is little, and a small amount of air is contained in the hydraulic oil in order for the piston and ... | 12/16/2008 |
| 7328484 | Hinge The invention relates to a hinge comprising a moveable hinge section and a hinge section consisting of a fixed stop section, which are interconnected by at least one joint axis, and comprising a damping device mounted on one of the hinge sections whose translational... | 02/12/2008 |
| 7270029 | Passive entry side door latch release system A vehicle passive entry side door latch release system engageable with a release cable connected a door latch includes a moveable linkage assembly engageable with the cable, and a motor including an output shaft engaged with a tensioning gear for driving a ratchetin... | 09/18/2007 |
| 7234201 | Door closer power adjusting device A door closer power adjusting device for a door closer having a spindle driven by a compressed spring with a movable plate for adjusting spring compression, or with a screw for adjusting spring compression, between a high and low level of compression. A powered unit... | 06/26/2007 |
| 7124469 | Automatic sliding door closure device An automatic sliding door closure device for use with a sliding door on a track. The device comprises a housing attached to the door having a connecting arm attached to the housing. A pulley rotatably mounted within the housing guides a cable having an exterior end ... | 10/24/2006 |
| 7051403 | Electromechanical swing leaf operator The invention relates to an electromechanical swing leaf operator having a door closer (1) with an eccentrically supported pinion (6) that presents a circular rolling curve and meshes with a toothed rack (5) being disposed at a piston (4)... | 05/30/2006 |
| 7025343 | Adjusting method and adjusting mechanism for remedying the coil pitch tolerance and fatigue deformation of adjustable helical spring In an adjusting method for remedying the coil pitch tolerance and fatigue deformation of an adjustable helical spring, an adjusting mechanism is mounted at one end of the casing for the adjustable helical spring for changing the precompression or the pretension of t... | 04/11/2006 |
| 7024725 | Overhead door closer with slide arm assembly This invention relates to an overhead door closer with slide arm assembly having a toothed pinion that is eccentrically supported and presents a circular rolling curve, which pinion meshes with a toothed rack arranged at a piston. The invention concentrates on a par... | 04/11/2006 |
| 7007342 | Door closer The present invention relates to a door closer, in a housing of which is received a sliding cylinder, the sliding cylinder is provided with teeth on an outer periphery thereof for meshing with a gear wheel of a door shaft, a sliding cylinder interiorly formed with i... | 03/07/2006 |
| 6978516 | Apparatus for controlling various movements of a door Apparatus for controlling various and different movements of a door, said apparatus having a door hinge assembly with a hinge pin having a plurality of bearing surfaces to reduce stress and wear on a hinge pin housing, a torque mechanism for pre-torquing and torquin... | 12/27/2005 |
| 6978515 | Balancing device of raising-lowering window A balancing force adjusting device for a window which raises and lowers includes a case, a horizontal gear member, a click member and a vertical gear member. The horizontal gear member is rotatably arranged around the horizontal axis in a predetermined position with... | 12/27/2005 |
| 6618899 | Door closer and method of producing a door closer A door closer assembly and method of making the assembly, in which the closing force is exerted by at least one closing spring. The door closer assembly comprises a housing, a rotor journalled in said housing to deliver torque, and at least one piston app... | 09/16/2003 |
| 6510586 | Door closer Door closer with a spring system that must be stretched when the door is open and supplies the closing moment necessary to close the door. There is provided a gear train between the spring system and the door to influence the force curve which varies over... | 01/28/2003 |
| 6421876 | Door closer A door closer with an oblong, one-piece body such to achieve a compact and aesthetic unit which can be produced with a minimum material consumption. The door closer has lateral faces which each have a curvature and/or bevel that shapes towards each other,... | 07/23/2002 |
| 6282750 | Power adjustment size indicator for a door closer A gear driven dial indicator is used to indicate the door closer size for a door closer having an adjustable closing force. A drive gear is attached to the door closer adjustment screw. In the preferred embodiment, this drive gear engages a ring gear whic... | 09/04/2001 |
| 6266847 | Door operator and process for operation of a door operator A door closer assembly and a method for operating a door closer assembly. The door closer assembly includes a housing and a door piston guided in the housing. The door piston is operably connected to move a door. A spring piston is guided in the housing a... | 07/31/2001 |
| 6189181 | Door retaining device A door retaining structure is provided for limiting the path of a door pivotably mounted on a door frame. The door retaining structure includes a connection structure for interconnecting the door and the door frame. An inertial locking device is operative... | 02/20/2001 |
| 6151753 | Door closer to generate a sudden change in the transmission ratio during the closing phase A door closer with a door piston, which door piston is acted on by a driven shaft during the opening of a door. The door piston has an extension attached to it. The door closer also can have a pressure piston and an energy storage mechanism which acts on ... | 11/28/2000 |
| 6047440 | Non-rotating pinion cap A non-rotatable pinion cap for use on a non-handed door closer where both ends of the drive pinion extend beyond the cylinder body. The pinion cap has one exposed edge for engaging the door or door frame surface and includes a christmas tree plug for atta... | 04/11/2000 |
| 5943736 | Door closer A door closer includes a casing-like body enclosing a piston member, which is movable back and forth according to the movements of a door and is in cooperation with at least one closer spring, and a closer shaft and a pinion member connected thereto for t... | 08/31/1999 |
| 5864920 | Door closer for the non-fire side of a fire-door safety installation A door control device for use on a non-fire side of a fire-door mounted in a door frame in a fire-door safety installation has a door closer assembly filled with a hydraulic damping fluid and attached to a non-fire side of the fire-door by at least one fa... | 02/02/1999 |
| 5850671 | Door closer A hydraulically damped door closer is described which has a relatively weak closer spring (3c) and stronger back-up closer springs (3a, 3b). If, after a predetermined time period, the door does not arrive in the closed position under the effect of the clo... | 12/22/1998 |
| 5802670 | Door closer A door closer with an adjustable springiness has an adjusting screw located inside the pressure chamber and at the same time inside the pressure spring.... | 09/08/1998 |
| 5709009 | Door closer for the non-fire side of a fire-door safety installation A door control device for use on a non-fire side of a fire-door mounted in a door frame in a fire-door safety installation has a door closer assembly filled with a hydraulic damping fluid and attached to a non-fire side of the fire-door by at least one fa... | 01/20/1998 |
| 5676222 | Device for generating a rotary return force A device for generating a rotary return force includes a casing unit, driving and driven gear units disposed in the casing unit, and a torsion spring. The driving gear unit includes a driving axle mounted rotatably to the casing unit and a driving gear wh... | 10/14/1997 |
| 5622006 | Surface mount bi-directional gate assembly A bi-directional door for the elderly and handicapped which comprises a support assembly mounted to a floor, a swing gate pivotally mounted about a support shaft in the support assembly, and a controller assembly located within the support assembly. A fir... | 04/22/1997 |
| 5553353 | Door damping system A door damping system includes a base fixed to a wall, a fixing element fixed to the door and a rod connected between the base and the fixing element, the base having a pinion rotatably disposed in the base and the pinion coupled to the rod and a coil spr... | 09/10/1996 |
| 5495639 | Door closing apparatus A door closing apparatus for closing a hinged door in which a door closer is attached to a spring unit which in turn is mounted on the door frame by a bracket. The spring unit has a torsion spring within a housing which rotates on the bracket. One end of ... | 03/05/1996 |
| 5206971 | Apparatus and method for increasing the efficiency of a door closer by reducing friction therein A door closer has a fluid conduit connecting the high pressure portion of the cylinder in front of the piston with a cavity between the surfaces of the cylinder wall and the piston. This cavity is located at the intermediate lateral surface of the piston ... | 05/04/1993 |
| 5015048 | Closing device for drawers A closing device is provided for a drawer having a pull-out rail fastened to the drawer and a supporting rail fastened to the body of an article of furniture. An energy storing member is arranged between the drawer and the furniture body, preferably betwe... | 05/14/1991 |
| 4979265 | Wide angle hinge with gear drive A wide angle hinge is used for articulation of a furniture door on a furniture unit with a base plate mounted on the furniture unit and a housing mounted on the furniture door; mounted on the base plate is a first gear rack on which a gear is rolled in th... | 12/25/1990 |
| 4979261 | Variable position door closer Disclosed is a door control device that automatically repositions the driving shaft of the door closer toward and away from the door pivot, as the door opens and closes, as a means of modifying and improving the force required to open and close the door. ... | 12/25/1990 |
| 4905574 | Single-acting rotary pneumatic actuator, including at least a precompressed spring assembly The rotary actuator includes at least a precompressed spring assembly comprising a compression coil spring the ends of which are engaged by flanged cups adapted to limit the spring extension and carried slidably on a pin provided, at each end, with a circ... | 03/06/1990 |
| 4872239 | Door closure with mechanical braking means A mechanical disk-type door closure wherein one end of the closure is connected to a door and the other end is pivotally connected to a door jam such that when the door pivots about its hinge. The closure includes a rod upon which a rack is formed to caus... | 10/10/1989 |
| 4788742 | Torque modification apparatus for use with a door closer A torque modification device for use with a pocket door which is adaptable to modify the torque applied by a door closer to the door to increase the torque when the door approaches its fully latched condition.... | 12/06/1988 |
| 4686739 | Door closer A door closer the closing force of which can be adjusted is provided with a device for indicating the selected closing force. The device used to indicate the prevailing closing force is actuated in dependence on the adjustment of the spring which determin... | 08/18/1987 |
