Photo-multiplier tube removal tool

• US 7,694,610 B2
• Filed: 06/27/2007
• Issued: 04/13/2010
• Est. Priority Date: 06/27/2007
• Status: Expired due to Fees

• Current Assignee: Siemens Medical Solutions USA Incorporated (Siemens AG)
• Original Assignee: Siemens Medical Solutions USA Incorporated (Siemens AG)
• Inventors: Hanrahan, William J., Flores, Thomas H.
• Primary Examiner(s): Shakeri; Hadi
• Application Number:
  US11/769,359
• Publication Number:
  US 20090000428A1
• Time in Patent Office: 1,021 Days
• Field of Search: 81/60, 811/761, 811/76, 81/15, 811/762, 811/19, 811/211, 811/246, 811/775
• US Class Current: 81/176.2
• CPC Class Codes: B25B 13/48 for special purposes
• CPC Class Codes: H01J 43/00 Secondary-emission tubes; Electron-multiplier tubes dynamic electron-multiplier tubes H01J25/76
• CPC Class Codes: Y10T 29/49721 with disassembling

Abstract

A tool is provided including a ratchet assembly including a handle grip and a socket; and a clamping assembly including a clamp with a notch; wherein the ratchet assembly is configured to be affixed to the clamping assembly so that a rotatable force applied to the handle grip actuates the clamp.

Claims

1. An installation tool for a photo-multiplier tube (PMT), wherein the PMT has a neck portion defining a circumferential surface and has an electronic circuit board oriented axially above the neck portion that projects radially outwardly past the circumferential surface, the tool comprising:

a clamp assembly having;

a rotational axis;

a circular base portion at a proximal end defining a central axis substantially coaxial with said rotational axis;

a jaw assembly including a pair of opposed jaws on one end thereof, the jaws defining an engagement surface conforming to the PMT neck portion circumferential surface and a centroidal axis substantially coaxial with said rotational axis;

a jaw gap defined within the engagement surface for receipt of the PMT neck therein;

a pedestal having an end coupled to the jaw assembly laterally offset from said rotational axis and generally projecting axially away from the jaws toward the proximal end of the clamp assembly, for providing clearance for receipt of the PMT electronic circuit board within the clamp assembly; and

an arm coupled to the pedestal on the other end thereof distal the jaws and projecting generally toward said rotational axis; and

an actuating assembly including a symmetrical handle, defining an axis of symmetry, coupled to the circular base portion of the clamp assembly at said proximal end, the axis of symmetry coaxial with said rotational axis.

2. The tool of claim 1, wherein the actuating assembly has a shaft coupled to the clamp assembly coaxial with the rotational axis.

3. The tool of claim 2, wherein shaft has a polygonal cross-sectional profile that engages a corresponding profile aperture defined by the clamp assembly.

4. The tool of claim 1, wherein clamp assembly and actuating assembly are selectively coupled to each other.

5. The tool of claim 1, wherein the handle has a T-shaped outer surface profile.

6. The tool of claim 1, wherein the opposed jaws engagement surface and the PMT neck portion respectively define mating notches that engage with each other.

7. A method for removing a photo-multiplier tube (PMT) that is adhesively bonded to a light pipe shield, wherein the PMT has a neck portion defining a circumferential surface that is bonded to the shield, and has an electronic circuit board oriented axially above the neck portion that projects radially outwardly past the circumferential surface, the method comprising:

providing an installation tool including a clamp assembly having;

a rotational axis;

a circular base portion at a proximal end defining a central axis substantially coaxial with said rotational axis;

a jaw assembly including a pair of opposed jaws on one end thereof, the jaws defining an engagement surface conforming to the PMT neck portion circumferential surface and a centroidal axis substantially coaxial with the clamp rotational axis;

a jaw gap defined within the engagement surface;

a pedestal having an end coupled to the jaw assembly laterally offset from the said rotational axis and generally projecting axially away from the jaws toward the proximal end of the clamp assembly, and an arm coupled to the pedestal on the other end thereof distal the jaws and projecting generally toward the said rotational axis; and

an actuating assembly including a symmetrical handle, defining an axis of symmetry, coupled to the circular base portion of the clamp assembly at said proximal end, the axis of symmetry coaxial with the said rotational axis;

engaging the PMT neck portion with an installation tool by sliding the opposing jaws transverse to the PMT neck and engaging said neck circumferential surface with the engagement surface; and

thereafter

simultaneously pushing and twisting the installation tool coaxially about the rotational axis without rocking same by grasping the handle, the twisting motion transverse to the rotational axis thereby breaking the adhesive bond between the PMT and light pipe shield while reducing likelihood of damage to the PMT that might be caused by rocking the PMT relative to the rotational axis.