Plural bobbin dispenser

• US 5,718,365 A
• Filed: 10/06/1995
• Issued: 02/17/1998
• Est. Priority Date: 10/06/1995
• Status: Expired due to Fees

• Current Assignee: 3M Company
• Original Assignee: Modcom Incorporated
• Inventors: Palmer, Robert H.
• Primary Examiner(s): JONES, EUGENIA A
• Application Number:
  US08/540,258
• Time in Patent Office: 865 Days
• Field of Search: 225/34, 225/37, 225/38, 225/39, 225/42, 225/52, 225/56, 225/72, 225/89, 206/63.5, 242/594, 242/594.2, 242/594.3, 242/594.5, 242/591, 242/596.1, 242/596.3, 242/598.1, 242/598.2, 83/650
• US Class Current: 225/38
• CPC Class Codes: A61C 7/306 Dispensers or attachment instruments therefor
• CPC Class Codes: Y10T 225/237 With individual blade for each source
• CPC Class Codes: Y10T 225/241 With mounting means for housing
• CPC Class Codes: Y10T 225/253 Restricted or restrictable work outlet
• CPC Class Codes: Y10T 225/295 Blade manually movable to or from severing position

Abstract

In general, the medical apparatus provides contamination-free dispensing of a desired supply of cut-separable, intraoral ligators from a chain of such ligators. Preferably, the apparatus also provides quick loading/unloading of bobbins holding coil-wound chains of such ligators. More preferably, the apparatus provides easy positioning of such chains into a ready-to-use position so that a user may dispense a supply of such chain. The medical apparatus includes a frame and a bobbin around which a chain is wound. The chain preferably is elongate, homogeneous, and unitary and more preferably is a molded chain of plural cut-separable intraoral ligators (i.e., O-ring ligators) for use during an orthodontic ligating procedure. A hub structure and an anvil are attached to the frame. The hub structure includes a hub for mounting the bobbin thereon so that the bobbin rotates about the hub as the chain pays out from the bobbin. The anvil is attached to the frame such that the chain pays out from the bobbin in the direction toward the anvil. The anvil includes a blade and a resistance passageway through the anvil. The passageway is configured for the chain to be fed therethrough so that a section of chain may be severed from it by circumflecting the chain over the anvil and across the blade. Preferably, the hub structure is pivotally attached to the frame so that the bobbin may be quickly loaded and unloaded from the hub. More preferably, the anvil is also pivotally attached to the frame so that the anvil can swing up to expose the resistance passageway, thereby facilitating threading of the chain through the passageway.

Claims

1. A chain dispenser including a frame and a bobbin around which a chain is wound, the dispenser comprising:

a swing hub structure for quick loading and unloading of the bobbin, said swing hub structure includes a hub for mounting file bobbin thereon, wherein said swing hub structure is pivotally attached to the frame and when mounted, the bobbin rotates around the hub as the chain pays out from the bobbin;

an anvil attached to the frame such that the chain pays out from the bobbin in a direction toward said anvil, wherein said anvil includes a resistance passageway through said anvil, and carries a blade adjacent said passageway, the passageway being configured to resist the chain fed therethrough as it pays out from the bobbin so that a section of the chain is severed from the chain by circumflecting the chain over said anvil and across the blade; and

a pin connected to a rear portion of the frame, which rear portion is opposite a front portion where said anvil is attached to the frame, wherein the frame includes a floor and said swing hub structure further includes a substantially planar and substantially polygonal member, the member having;

a first corner section from which the hub projects, wherein the hub has a center point;

a second corner section having a hole therethrough, wherein the pin is inserted through the hole so that the member may pivot about a longitudinal axis of the pin and swing between a ready-to-use position and a loading position and wherein the hole is at least a first predefined distance from the center point of the hub so that the hole and the pin do not interfere with rotation of the bobbin about the hub; and

a third corner section having an edge for supporting the member on the floor of the frame when the member is in the ready-to-use position, wherein the edge is at least a second predefined distance from the center point of the hub so that the floor of the frame does not interfere with rotation of the bobbin about the hub.

2. The dispenser of claim 1 further comprising plural bobbins and hub structures, wherein said anvil includes a blade and resistance passageway corresponding to each bobbin and hub structure.

3. The dispenser of claim 1 further comprising an adhesion system connected to the frame, the adhesion system for securely adhering the frame to a surface support structure so that the dispenser is immobilized.

4. The dispenser of claim 1, wherein the bobbin is substantially circular and has a radius and wherein the first and second predefined distances are greater than the radius of the bobbin.

5. A chain dispenser including a frame and a bobbin around which a chain is wound, the dispenser comprising:

a swing hub structure for quick loading and unloading of the bobbin, said swing hub structure includes a hub for mounting the bobbin thereon, wherein said swing hub structure is pivotally attached to the frame and when mounted, the bobbin rotates around the hub as the chain pays out from the bobbin;

a rocking anvil pivotally attached to the frame in a position relative to said hub structure such that the chain pays out from the bobbin in a direction toward said anvil, wherein said anvil includes a blade and a resistance passageway through said anvil, the passageway configured for the chain to be fed there through so that a section of the chain is severed from the chain by circumflecting the chain over said anvil and across the blade, and wherein said anvil swings up to expose the resistance passageway, so that threading the chain through the resistance passageway is facilitated; and

a pin connected to a rear portion of the frame, which rear portion is opposite a front portion where said anvil is attached to the frame, wherein the frame includes a floor and said swing hub structure further includes a substantially planar and substantially polygonal member, the member having;

p2 a first corner section from which the hub projects, wherein the hub has a center point;

a second corner section having a hole therethrough, wherein the pin is inserted through the hole so that the member may pivot about a longitudinal axis of the pin and swing between a ready-to-use position and a loading position and wherein the hole is at least a first predefined distance from the center point of the hub so that the hole and the pin do not interfere with rotation of the bobbin about the hub; and

a third corner section having an edge for supporting the member on the floor of the frame when the member is in the ready-to-use-position, wherein the edge is at least a second predefined distance from the center point of the hub so that the floor of the frame does not interfere with rotation of the bobbin about the hub.

6. The dispenser of claim 5 which further comprises a plurality of bobbins and hub structures, and wherein the anvil includes, for each bobbin and hub structure, a resistance passageway, and joined to the anvil, downstream from each said additional resistance passageway, an associated blade.

7. The dispenser of claim 5 further comprising an adhesion system connected to the frame, the adhesion system for securely adhering the frame to a surface support structure so that the dispenser is immobilized.

8. The dispenser of claim 5, wherein the bobbin is substantially circular and has a radius and wherein the first and second predefined distances are greater than the radius of the bobbin.

9. The dispenser of claim 5, wherein the resistance passageway is substantially vertical when the rocking anvil is in a cutting position and the resistance passageway is substantially horizontal after the rocking anvil pivots into a chain-feeding position.

10. The dispenser of claim 5, wherein:

the frame includes a shoulder section to which said anvil is pivotally attached, the shoulder section having a convex, semi-circular corner; and

said anvil includes a stop projecting from said anvil and over the shoulder section, the stop having a concave, semi-circular recess that matingly conforms with the corner of the shoulder section such that the stop limits the extent of pivot of said anvil when boundary edges of the recess contact the corner.

11. A dispenser of a chain of elongate, homogeneous, unitary, cut-separable, intraoral ligators for use during an orthodontic ligating procedure, the dispenser including a frame having a shoulder section, and the shoulder section having a convex, semi-circular corner, the dispenser comprising:

a bobbin around which the chain is wound, the bobbin including a casing with a circular periphery, wherein the casing encloses the chain therewithin so that the chain'"'"'s exposure and thus cross-contamination is limited, the casing having a perimetral, resilient, deformable lip about the periphery of the casing so that as the chain pays out from the bobbin, the chain escapes the casing in a cross-contamination minimizing manner;

a swing hub structure for quick loading and unloading of the bobbin, said swing hub structure includes a hub for mounting the bobbin thereon, wherein said swing hub structure is pivotally attached to the frame and when mounted, the bobbin rotates around the hub as the chain pays out from the bobbin; and

a rocking anvil pivotally attached to the shoulder section of the frame in a position relative to said hub structure and bobbin such that the chain pays out from the bobbin in a direction toward said anvil, wherein said anvil includes a blade and a resistance passageway through said anvil, the passageway configured for the chain to be fed therethrough so that a section of the chain is severed from the chain by circumflecting the chain over said anvil and across the blade, and wherein said anvil swings up to expose the resistance passageway, so that threading the chain through the resistance passageway is facilitated, said anvil including a stop projecting from said anvil and over the shoulder section, the stop having a concave, semi-circular recess that matingly conforms with the corner of the shoulder section such that the stop limits the extent of pivot of said anvil when boundary edges of the recess contact the corner.

12. The dispenser of claim 11, wherein the casing has a dual-cymbal shape with a hole therethrough for mounting onto the hub.