Threaded rod and nut assembly

• US 20060247581A1
• Filed: 02/17/2006
• Published: 11/02/2006
• Est. Priority Date: 09/08/2003
• Status: Abandoned Application

• Current Assignee: Novo Nordisk A/S
• Original Assignee: Novo Nordisk A/S
• Inventors: Rasmussen, Henrik, Pedersen, Thomas
• Application Number:
  US11/356,678
• Publication Number:
  US 20060247581A1
• Time in Patent Office: Days
• US Class Current: 604/218
• CPC Class Codes: A61M 2005/31508 provided on the piston-rod
• CPC Class Codes: A61M 5/31501 Means for blocking or restricting the movement of the rod or piston A61M5/5013 takes precedence
• CPC Class Codes: A61M 5/31511 Piston or piston-rod constructions, e.g. connection of piston with piston-rod A61M5/5066 takes precedence
• CPC Class Codes: A61M 5/31515 Connection of piston with piston rod
• CPC Class Codes: A61M 5/31541 Means preventing setting of a dose beyond the amount remaining in the cartridge
• CPC Class Codes: A61M 5/3155 by rotational movement of dose setting member, e.g. during setting or filling of a syringe

Abstract

Disclosed is a stop for preventing a threaded rod from screwing thru a nut. The stop is formed by manufacturing a threaded rod having an unthreaded cylindrical portion and one or more grooves cut or manufactured longitudinally in the rod across both the threaded section and the unthreaded portion. A nut having an interior thread complementary to that of the rod has a hole bored thru its wall over a peak in the interior thread. The hole creates a stop surface on the interior thread that abuts a stop surface created by the groove in the unthreaded portion of the rod.

Claims

1. A threaded rod and nut assembly with a stop that prevents the nut (14) from screwing off the rod (1) in one direction, the assembly comprising:

a rod (1) having a thread (2) disposed on a portion of its outer surface, a cylindrical portion (4) of the rod (1) remaining unthreaded, and

a nut (14) having a female thread (15) on a at least a portion of its inner surface,

Characterized in that, the peak of the female thread (15) ends in a stop surface (22) within the nut (14).

2. A threaded rod and nut assembly according to claim 1, characterized in that, a hole (20) is provided over the peak in the interior thread (15) of the nut (14) from the inner surface to the outer surface thereby forming the stop surface (22) within the nut (14).

3. A threaded rod and nut assembly according to claim 1, characterized in that, the peak of the female thread (15) ends abruptly.

4. A threaded rod and nut assembly according to claim 3, characterized in that, the stop surface (22) within the nut (14) is substantially parallel with the longitudinal axis of the nut (14).

5. A threaded rod and nut assembly according to any of the preceding claims, characterized in that, one or more grooves (5) in a longitudinal direction is provided in the rod (1).

6. A threaded rod and nut assembly according to claim 5, characterized in that, the grooves (5) extends through the threaded area and into the cylindrical unthreaded portion (4), thereby forming a rod stop surface (10) on the cylindrical portion (4)

7. A threaded rod and nut assembly according to claim 5, characterized in that the rod (1) has at least two grooves (5) preferably opposite each other.

8. A threaded rod and nut assembly according to anyone of the claims 5, characterized in that, the rod stop surface (10) is substantially parallel with the longitudinal axis of the rod (1).

9. A threaded rod and nut assembly according to anyone of the preceding claims, characterized in that, the stop surface (22) within the nut (14) and the rod stop surface (10) interfaces each other in the stop position.

10. A method of manufacturing a threaded rod (1) and nut (14) assembly with a stop that prevents the nut (14) from screwing off the rod (1) in one direction according to any of the claims 1 to 8, the method comprising the steps of:

i) forming a thread (2) on the outer portion of a cylindrical rod (1),

ii) stopping the threading prior to reaching an end of the rod (1), thereby leaving a cylindrical portion (4) of the rod (1) unthreaded,

iii) forming one or more longitudinal grooves (5) in at least a portion of the outer surface of the rod (1), thereby forming a stop surface (10) on the rod (1), and

iiii) creating a hole (20) in a threaded nut (14) at least partly through a raised portion (peak) of a thread (15) on the interior of the nut (14), thereby forming a complimentary stop surface (22) within the nut (14).

11. The method of claim 10, characterized in that, the grooves (5) are formed in the rod (1) prior to the thread (2) being created.

12. The method of claim 11, characterized in that, a thread cutting tool machines the thread (2) into the rod (1) and is abruptly removed from the rod (1).