Door check

• US 4,912,806 A
• Filed: 02/19/1988
• Issued: 04/03/1990
• Est. Priority Date: 02/20/1987
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
• Original Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
• Inventors: Hayashi, Katsuhiko, Orii, Makoto
• Primary Examiner(s): Godici, Nicholas P.
• Assistant Examiner(s): Cuda, Carmine
• Application Number:
  US07/157,665
• Time in Patent Office: 774 Days
• Field of Search: 16/64, 16/69, 16/62, 16/49, 16/79, 16/DIG. 10, 16/77
• US Class Current: 16/64
• CPC Class Codes: E05F 3/00 Closers or openers with braking devices, e.g. checks; Construction of pneumatic or liquid braking devices construction of non-pneumatic or non-liquid braking devices E05F5/00; friction devices in hinges E05D11/08
• CPC Class Codes: E05F 3/16 with friction brakes
• CPC Class Codes: E05Y 2201/49 Wrap springs
• CPC Class Codes: E05Y 2900/132 Doors

Abstract

A door check is disclosed which comprises a first arm pivotally attached at one end thereof to a door which is able to be opened and closed as desired; a second arm pivotally attached at one end thereof to the first arm, the other end of the second arm being pivotally attached to a door frame for supporting the door in such a manner that the door is able to be opened and closed as desired; a driving force storing spring retained by either the first or second arm and biased in response to the pivotal motion of the door in the opening direction so as to store force for driving the door in the closing direction; a gear train for transmitting the rotation of the door when opened to said driving force storing spring and also transmitting the driving force stored in the driving force storing spring to the door; a brake rotated by means of the force released from the driving force storing spring to apply a brake force to the force; and a speed increasing gear train coupled at its starting end to said driving force storing spring to transmit the force released from the driving force storing spring to the brake after increasing the speed thereof. The speed increasing gear train has a worm in the final stage thereof.

Claims

1. A door check comprising:

input gear means for being rotated when a door rotates;

spring means for storing spring energy in accordance with rotation of said input gear means in a door opening direction;

means for transmitting to said input gear means release of the spring energy stored in said spring means;

means for braking the release of the spring energy;

a speed increasing gear train for the released spring energy to said braking means; and

worm gear means having a worm mounted on a worm shaft provided at a final output stage of said speed increasing gear train;

said means for braking comprising;

deformable friction plates having arm portions integrally formed therewith, said plates being supported by said worm shaft; and

a braking cup disposed at an end of said worm shaft so that said braking cup surrounds said plates;

said arm portions being elastically deformed when said worm shaft rotates at high speed so that said arm portions contact said braking cup causing braking of rotations of said worm shaft.

2. A door check comprising:

a first arm pivotably attached at one end thereof to a door which is able to be opened and closed as desired;

a second arm pivotably attached at one end thereof to said first arm, the other end of said second arm being pivotally attached to a door frame for supporting said door in such a manner that said door is able to be opened and closed as desired;

driving force storing means disposed in one of said first arm and said second arm, and biased in response to the pivotal motion of said door in the opening direction so as to store force for driving said door in the closing direction;

a gear train for transmitting the rotation of said door when opened to said driving force storing means and also transmitting the driving force stored in said driving force storing means to said door;

braking means rotated by means of the force released from said driving force storing means to apply brakes to said force; and

a speed increasing gear train coupled at its starting end to said driving force storing means to transmit the force released from said driving force storing means to said braking means after increasing the speed thereof, said speed increasing gear train having a worm in the final stage thereof.

3. A door check as claimed in claim 2, wherein said worm is mounted on a worm shaft, and said means for braking comprises:

deformable friction plates having arm portions integrally formed therewith, said plates being supported by said worm shaft; and

a braking cup disposed at an end of said worm shaft so that said braking cup surrounds said plates,

said arm portions being elastically deformed when said worm shaft rotates at high speed so that said arm portions contact said braking cup causing braking of rotation of said worm shaft.

4. A door check as claimed in claim 2, wherein said force for driving said door in said closing direction in said driving force storing means is transmitted through said speed increasing gear train.