Patents in Class 16/52

Matches 1 - 50 out of 92

1 2 >

Match	Document	Document Title
1	7421761	Door closer A door closer comprises a spindle journaled in a housing and connected to turn with a door. Upon rotation of the spindle, a cam carried by the spindle effects linear movement of a slide assembly...
2	7240603	Valve A piston assembly for a door closer includes a piston formed with a mounting hole and a door closer valve installed with clearance in the mounting hole. The door closer valve has a body part with...
3	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...
4	6871381	Door closure with adjusting mechanism for controlling door closing speed A readily adjustable door closure for varying the rate of speed at which an associated door may close which is effected by rotating the piston rod relative to the piston and associated cylinder...
5	6442795	Damper for a pivot door A damper for a pivot door has a piston movably received inside the damper and having a first channel and a second channel respectively and selectively communicating with a space full of hydraulic...
6	5502874	Speed regulating valve for fluid filled door closers A valve for regulating speed of operation of a door closer, includes an elongated hollow tubular body having a closed first end with driving provisions thereon, an open second end, and an orifice...
7	5487206	Door control device A door closing device comprises a piston (12) having at one end a seal (21) which seals the interface between the piston and a housing (10). The seal (21) also acts as a one-way valve and carries a...
8	5432977	Door Closers The door closer is of the kind which acts, for example between a door hinge stile and a hinge jamb and has a body for mounting usually in the stile, from which body a spring-biased tension member...
9	5414894	Door closer A door closer (20) is attachable to a door (24) and is formed with a chamber (44) in which a piston element (50) is movable to move fluid from the chamber to a reservoir (82) upon opening of the...
10	5274880	Door closer A door closer having a return spring for accumulating a recovering force in a door closing direction at the time of opening a door for performing a braking force by a damper at the time of closing...
11	5259090	Fluid door closer with means to permit entrapped gases to move A door closer (20) is attachable to a door (24) and is formed with a chamber (44) in which a piston element (50) is movable to move fluid from the chamber to a reservoir (82) upon opening of the...
12	5222277	Intermittently and reversibly operable hot wax energized hinge A powered hinge powered by a hot wax linear actuator, which can provide for bi-directional rotation of the hinge as the consequence of sequential and intermittent energizing and deenergizing...
13	5211269	Damper for a flapdoor using viscous fluid A damper for a flapdoor that does not show any damping effect when its movable shaft of the damper is rotated with the door in one sense whereas it effectively damps the rotary movement of the...
14	5187835	Door closer with rack and pinion, spring, and spring mounting plate A door closer includes a body having a closed, fluid-filled cylinder. A piston is slidably mounted in the cylinder and has an actuating rod with rack gearing. A pinion is rotatably mounted on the...
15	5170530	Door closer A door closer of the kind which acts between a door hinge stile and a hinge jamb has a body for mounting usually in the stile, and from the body a spring-biased tension member extends for anchoring...
16	5111548	Liquid check and closer A door closer which comprises a damper having a body case including an arm fixed to a door, a rotational shaft formed in the body case, a pair of chambers filled with high viscous liquids, a pair...
17	4844567	Vending machine with controlled return access door The prevent invention is directed to improvements in vending machines of the type having an access door which is opened by a purchaser for removing a purchased article from within the machine. A...
18	4835905	Door position indicator for a door closer A door position indicator for a door closer which senses the position of a door closer piston as a means of sensing door position. The door closer and hence the door position indicator may be...
19	4825503	Braking apparatus for door closer An improved door closer which prevents overly rapid closing due to an external force, such as wind pressure, being exerted on the door. A pair of oil holes are formed communicating with a first...
20	4793023	Door closer and holder A door closer and holder comprises a cylinder shell having a piston sealingly reciprocable therein. A spring biases the piston toward one end of the shell, and the piston is connected through the...
21	4723777	Basketball goal and backboard unit A basketball goal for mounting on a backboard for providing absorption and dissipation of the energy occuring during a dunk shot or the like. The rim of the goal is pivotally mounted to the...
22	4697302	Spring operated automatic door and window closing hinge An automatic door/window closing device has a center shaft provided with V-shaped spiral channels to a base such as its surface and secured to a base such as the ground, a floating piston which...
23	4697673	One-way damper A one-way damper has a rotor which is provided with a braking disc at one of its ends. The braking disc is received in a housing of the damper and the housing is filled with oil. The other end of...
24	4669147	Door closer A door closer has a first arm (4, 14) which is pivotally attached to the door case (2), a second arm (5, 15) which is pivotally attached to the door leaf (1), the opposite ends of the two arms...
25	4665583	Door closer piston assembly having separate head portions A hydraulic door closer has a housing including a bore and a piston supported for reciprocal sliding movement within the bore in door opening and closing directions corresponding, respectively, to...
26	4502180	Door control device having piston assembly with separately formed rack The piston assembly of a hydraulically controlled door closer has a tubular wall, plugs secured in end portions of the wall and a separate rack secured inside the tubular wall between the plugs by...
27	4414703	Door closer and holder A door closer and holder has cylinders with pistons therein responsive to the relative swinging motion between a door panel and a door frame. A spring is loaded by door opening and acts against one...
28	4372005	Operator for sliding doors A closure for a pair of sliding doors is provided that allows a user to open and automatically close both doors of a pair of sliding doors. The doors can be operated individually or simultaneously....
29	4325164	Offset pivot hinges with door closing devices A door closing device which is easily mounted on, and easily removed from, an offset pivot hinge. The door closing device has an outer sleeve, an inner member rotatably mounted in the outer sleeve...
30	4285094	Door closing apparatus A door closing apparatus includes a housing member defining a cylinder for receiving a reciprocable piston member. The housing also defines an opening for receiving a rotatable pinion meshing with...
31	4267619	Controlled release door holder A controlled release door holder comprises a housing having a portion defining a cylinder for containment of a fluid, a piston received in the cylinder for movement axially thereof and dividing the...
32	4256293	Throttle control dash pot A dash pot which functions to control a throttle throughout its movement and also functions as a throttle return spring comprising a cylindrical body in which a guide member and associated shaft...
33	4234996	Automatic door closer constructed for releasably holding a door in a predetermined partly open position An automatic door closer constructed for releasably holding a door in a predetermined partly open position mainly comprises a piston arranged in a cylinder bore of a housing and operatively...
34	4194264	Door check device A releasable latch, for attachment to a door check unit having a cylinder and a piston, and serving releasably to secure a door in an open position. A lever is freely slidable along the rod of the...
35	4185356	Door closer A door closer is connected to a door. The movements of the door cause a piston member in the door closer to pump a pressure medium through a flow duct. There is also a flow limiting member...
36	4178655	Counterbalance mechanism A mechanism for use in counterbalancing the weight of a lid or closure incident to movements thereof between closed and open portions is in the form of a spring pressurized, hydraulic...
37	4097956	Hydraulic door operator with overtravel restraint A door operator mechanism includes a spring biased piston 5 having a non-return valve 6 in its end face slidably disposed in a hydraulic cylinder 3 and coupled to a door lever arm through a pinion...
38	4073033	Door closing device A door closing device of the type having a piston and cylinder is described, the piston being movable within the cylinder under the bias of a spring and being connected to an arm mechanism which is...
39	4069545	Door control device with closure regulator A device for controlling the opening and closing movement of a duct seal door of an automatic ice maker which requires a regulator for slowing down the closing of the door. The movement of the door...
40	4048694	Hydraulic door closer with adjustable time delay dampener A door closer of the kind having a piston slidably mounted in a bore containing hydraulic fluid and dividing that bore into damping and reservoir chambers. Drive means is connected to the piston to...
41	4043001	Adjustable spring hinge An improved spring hinge includes a capstan for securing one end of a torsion spring in a knuckle of the hinge. To prevent axial movement of the capstan out of the hinge knuckle and permit axial...
42	3990548	Adjustable hydraulic dashpot A hydraulic dashpot having a pressure tube with a port defining a metering orifice through which fluid is metered upon application of impact forces to a piston assembly slidable in the pressure...
43	3965533	Adjustable door spring hinge with fixed minimum tension Aligned hollow knuckles on a pair of hinge leaves form a cylindrical barrel. Spaced plugs inserted into each end of the barrel serve to keep the knuckles from separating and act as a pivot pin for...
44	3952365	Damping device for hinges and the like A device includes a spring for biasing a door or other similar structure into a closed position and a fluid medium for damping movement of the door. The damping effect is achieved by compelling the...
45	3913170	Door closer A door closer for affording a controlled closing movement to a door including a return spring, an oil hydraulic piston and cylinder means, and a valve for generating a damping force when the door...
46	3825973	ADJUSTABLE DOOR HINGE CONTAINING COIL SPRING A tubular pivot pin inside the barrel of a pair of hinge leaves contains a coil spring. Mounted in the opposite ends of the barrel are plugs, one of which is provided with an axial passage through...
47	3781943	HYDRAULIC DOOR CLOSER A hydraulic cylinder has a piston movable therein on a piston road threadably engaged in said piston. The rod extends out of the cylinder through a gland at one end and a spring is positioned...
48	3751995	SEQUENTIAL ROTARY AND LINEAR ACTUATING MECHANISM A compact mechanism for controlling angular and lateral positioning of one member in relation to another. Actuation is effected by a single prime mover through gearing of a type to rotate one of...
49	3708826	ADJUSTABLE HYDRAULIC DOOR CLOSURE In a door closure of the type having hydraulic fluid within a cylinder slowing or dampening the rate of retraction of a spring powered piston-piston rod assembly, a final closing kick action...
50	3707014	DEVICE FOR CLOSING, HOLDING OPEN AND HOLDING CLOSED A DOOR OR EQUIVALENT, IN PARTICULAR ONE FOR DOORS WITH CONCEALED HINGES The present invention concerns a device for closing, holding open and holding closed a door or equivalent, in which device all the functions mentioned have been advantageously combined in one...

Matches 1 - 50 out of 92

1 2 >