US 11,566,442 B2Granted

Resiliently mounted strike plate of an electromagnetic door lock

AssigneeHanchett Entry Systems, Inc.

InventorsLarry Gene Corwin, Jr., Dan Van Dusen

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Abstract

A strike plate mounting bolt assembly for resiliently mounting a strike plate to a door. The strike plate mounting bolt assembly includes a bolt and a post wherein the bolt is securably engageable with the post. The bolt is inserted through a bore in the door and the post is inserted through a bore in the strike plate. A resilient member such as at least one Belleville washer is disposed between a head of the post and a cavity in the strike plate wherein the at least one Belleville washer is compressed between the post head and cavity upon securing the bolt and post together to provide a resilient mount between the door and strike plate. The at least one Belleville washer may be a number of Belleville washers selectable stacked to form a pack of Belleville washers. By varying the number and orientation of the Belleville washers, the force/deflection characteristics of the pack may be tuned to accommodate the needs of a variety of electromagnetic lock design features.

Claims9

Dependent claims

A method of tuning a force/deflection characteristic of a strike plate mounting bolt assembly for resiliently mounting a strike plate to a door, wherein the strike plate includes a first through bore and a counter bore concentric with said first through bore, wherein said counter bore has a first diameter that is larger than a second diameter of said first through bore, wherein said counter bore defines a cavity having a ledge that is recessed from an outer surface of said strike plate, wherein the strike plate mounting bolt assembly includes a bolt and a post, wherein said bolt is configured to be received in a second through bore in said door, wherein said post includes a head end and a shaft end, and wherein said shaft end is connected to said bolt, said method comprises the steps of:

a) providing a collection of Belleville washers, each of said Belleville washers having a certain force/deflection characteristic;
b) determining the force/deflection characteristic of said strike plate mounting bolt assembly needed to permit a predetermined amount of movement of said door in an opening direction while said strike plate remains in contact with an energized electromagnet mounted to a door frame;
c) selecting a resilient member stack comprising two or more Belleville washers from said collection of Belleville washers that directly corresponds to said determined force/deflection characteristic of said strike plate mounting bolt assembly, wherein said resilient member stack has a certain solid height when fully compressed;
and
d) assembling said strike plate mounting bolt assembly using said selected resilient member stack, wherein said selected resilient member stack is disposed between said head end of said post and said ledge of said strike plate to achieve said determined force/deflection characteristic of said strike plate mounting bolt assembly through compression of said resilient member stack to said certain solid height while said door moves through said predetermined amount towards an open position and said strike plate remains in contact with said energized electromagnet with no additional bias force is imposed on said strike plate.

2 more elements

a) providing a collection of Belleville washers;
b) determining a first force needed to permit a predetermined amount of movement of said door in an opening direction while maintaining said strike plate in contact with an energized electromagnet mounted to a door frame, wherein said first force is directed in a closing direction which is opposite of said opening direction;
c) selecting a resilient member stack comprising two or more Belleville washers from said collection of Belleville washers that directly corresponds to said first force, wherein said resilient member stack has a certain solid height when fully compressed;
and
d) assembling said strike plate mounting bolt assembly using said selected resilient member stack, wherein said selected resilient member stack is disposed between said head end of said post and said ledge of said strike plate to achieve said first force through compression of said resilient member stack to said certain solid height while a second force in said opening direction moves said door through said predetermined amount towards an open position and said strike plate remains in contact with said energized electromagnet, wherein no additional force is imposed in said first direction.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/180,438Filed 5 Nov 2018 · continuation
Priority: 14 Apr 2016
Published: US 2019/0071892 A17 Mar 2019
Granted: 31 Jan 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

E05B 15/022
Striking-plates, keepers, staples: movable, resilient or yieldable
E05B 17/2084
Means independent of the locking mechanism for preventing unauthorised opening, e.g. for securing the bolt in the fastening position: means to…
E05B 47/0002
With electric actuators; Constructional features thereof: with electromagnets
E05C 19/166
Devices holding the wing by magnetic or electromagnetic attraction: electromagnetic

Family

Application62/322,344Us provisional application · filed 14 Apr 2016
Application62/381,387Us provisional application · filed 30 Aug 2016
Application15/486,431Parent of this continuation · filed 13 Apr 2017
US 2019/0071892 A1Pre-grant publication · published 7 Mar 2019
US 10,190,333 B2Parent of this continuation
US 2017/0298653 A1Published application
US 11,566,442 B2This patent

From the US filing history. Foreign family members aren’t listed.