Stand for a surgical microscope

• US 7,128,300 B2
• Filed: 06/25/2003
• Issued: 10/31/2006
• Est. Priority Date: 12/03/2002
• Status: Active Grant

• Current Assignee: Leica Instruments Singapore Pte Ltd (Danaher Corporation)
• Original Assignee: Leica Microsystems (Schweiz) AG
• Inventors: Frick, Roman
• Primary Examiner(s): Chilcot, Jr., Richard E.
• Assistant Examiner(s): Le, Tan
• Application Number:
  US10/603,509
• Publication Number:
  US 20040104328A1
• Time in Patent Office: 1,224 Days
• Field of Search: 248/121, 248/122.1, 248/125.7, 248/415, 248/145.7, 248/289.11, 248/288.51, 248/418, 248/646, 248/658, 248/676
• US Class Current: 248/418
• CPC Class Codes: A61B 2090/504 with a counterweight
• CPC Class Codes: A61B 90/20 Surgical microscopes characterised by non-optical aspects
• CPC Class Codes: A61B 90/25 Supports therefor
• CPC Class Codes: A61B 90/50 Supports for surgical instruments, e.g. articulated arms
• CPC Class Codes: F16M 11/2014 around a vertical axis F16M11/2035 takes precedence
• CPC Class Codes: F16M 2200/022 by friction
• CPC Class Codes: F16M 2200/044 for balancing rotational movement of the undercarriage

Abstract

A stand (3) for a surgical microscope comprising at least one vertical rotary bearing (4). A pivot arm (5) is mounted rotatably in the rotary bearing (4). An electromagnetic brake (6) for blocking the pivoting motion of the pivot arm (5) in the rotary bearing (4) is provided. A mechanical brake (7) with adjustable braking force is additionally present for braking the pivot arm (5) in the rotary bearing (4).

Claims

1. A stand (3) for a surgical microscope comprising:

a stand column (1);

a pivot arm (5);

a rotary bearing (4) for mounting the pivot arm (5) on the stand column (1);

an electromagnetic brake (6) for blocking the pivoting motion of the pivot arm (5) in the rotary bearing (4); and

a mechanical brake (7) having adjustable braking force for braking the pivot arm (5) in the rotary bearing (4), wherein the mechanical brake (7) includes a resiliently preloaded pin (8) and a brake pad (9) connected to the pin (8) and wherein the mechanical brake further includes a hollow stem (10), a cup spring packet arranged in the hollow stem, and a set screw (11) threadably received by the hollow stem (10), the pin (8) is mounted in the hollow stem (10), and the preload on pin (8) is adjustable by way of the set screw (11), a hollow stem (10) and a set screw (11) threadably received by the hollow stem (10), wherein the pin (8) is mounted in the hollow stem (10), and the preload on the pin (8) is adjustable by way of the set screw (11), and wherein the mechanical brake further includes a cup spring packet (12) arranged in the hollow stem (10).

2. The stand (3) as defined in claim 1, wherein the rotary bearing (4) includes a flange (13) having a recess (14) facing the pivot arm (5) for reception of the brake pad (9), and the hollow stem (10) is arranged in the flange (13).

3. The stand (3) as defined in claim 1, wherein the brake pad (9) is manufactured from bronze.

4. The stand (3) as defined in claim 1, wherein the brake pad (9) has a curved surface (15) for contacting the pivot arm (5).

5. The stand (3) as defined in claim 4, wherein the curved surface (15) of the brake pad (9) is concave.