| 摘要 |
<p>Applicant: Maclay M. Armstrong Title: Orthodontic Headgear Disconnectible Connection An external force-reaction device engageable with the wearer's head and/or neck, such as a headcap or a neckband, is connected to an intraoral force-applying device, such as molar bands, by helical spring forceproducing means. Snapback of the force-applying means is controlled in response to stressing of the forceproducing means. Snapback of the force-applying means is controlled in response to stressing of the forceproducing means beyond a predetermined maximum degree of force exerted by the force-producing means. Snapback control is effected by disconnectible connection means which can be disconnected to interrupt the application to the intraoral means of force capable of moving such intraoral means.</p> |
