Precision balance with scale on top

• US 4,884,645 A
• Filed: 03/15/1989
• Issued: 12/05/1989
• Est. Priority Date: 03/26/1988
• Status: Expired due to Fees

• Current Assignee: Sartorius Gmbh
• Original Assignee: Sartorius Gmbh
• Inventors: Melcher, Franz-Josef, Knothe, Erich
• Primary Examiner(s): MILLER JR, GEORGE
• Application Number:
  US07/323,892
• Time in Patent Office: 265 Days
• Field of Search: 177/179, 177/180, 177/238-243
• US Class Current: 177/180
• CPC Class Codes: G01G 21/28 Frames, Housings
• CPC Class Codes: G01G 21/30 Means for preventing contamination by dust

Abstract

In an electric precision balance with scale on top, protected against the penetration of foreign bodies and with a low-displacement measuring system (1), a parallel-guided balance scale carrier (3) for a balance scale (11) which is guided without contact through a housing opening (4) of a surrounding system housing (2) or protective cap, the balance scale carrier (3) is designed for its part with its part running upward outside of the system housing (2) as a protective hood (8) which covers the system housing (2) at least at the top and the sides and which comprises receiving bearings (9) at the low edge (8'"'"') for intermediary members (10) which support the balance scale (11), said intermediary members are surrounded without contact by casings (12) which form foreign-body baffles open at the top and the bottom which are a component of a general housing (7) surrounding the system housing (2) and said general housing comprises drainage openings (17,17'"'"') located in its low bottom parts.

Claims

1. An electronic precision balance with the weighing surface on top, protected against the penetration of foreign bodies and with a low-displacement measuring system, a parallel-guided balance scale carrier for a balance scale which is guided through a housing opening of a surrounding system housing or protective cap, comprising in that the balance scale carrier (3) is designed for its part with its part running without contact through an opening (4) upward outside of the system housing (2) as a protective hood (8) which covers the system housing (2) at least at the top and the sides and which comprises receiving bearings (9) at the low hood edge (8'"'"') for intermediary members (10) which support the balance scale (11) and that said intermediary members are surrounded without contact by casings (12) which form foreign-body baffles open at the top and the bottom which are a component of a general housing (7) surrounding the system housing (2) and that said general housing comprises drainage openings (17,17'"'"') located in its low bottom parts.

8. The precision balance with the weighing surface on top according to claim 1, wherein the drainage openings (17) are located on the outer edge of the bottom part (13) of the general housing (7).

9. The precision balance with the weighing surface on top according to claim 1, wherein the drainage openings (17'"'"') are located directly under the casings (12) and receiving bearings (9) for the balance scale.

10. The precision balance with the weighing surface on top according to claim 1, wherein the cover (15) of the general housing (7) is designed so that it drops off obliquely toward the periphery.

2. An electronic precision balance with weighing surface on top, protected against the penetration of foreign bodies and with a low-displacement measuring system, a parallel-guided balance scale carrier for a balance scale which is guided through a housing opening of a surrounding system housing or protective cap, comprising in that the balance scale carrier (3) merges for its part with its part running downward without contact through an opening (4) outside of the system housing (2) into laterally extending arms (8") which terminate in receiving bearings (9) for intermediary members (10) which support the balance scale (11) and that said intermediary members are surrounded without contact by casings (12) which form foreign-body baffles open at the top and the bottom which are a component of a general housing (7) surrounding the system housing (2) and that said general housing comprises drainage openings (17,17'"'"') located in its low bottom parts.

3. The precision balance with the weighing surface on top according to claim 2, wherein the drainage openings (17) are located on the outer edge of the bottom part (13) of the general housing (7).

4. The precision balance with the weighing surface on top according to claim 2, therein the drainage openings (17'"'"') are located directly under the casings (12) and receiving bearings (9) for the balance scale.

5. The precision balance with the weighing surface on top according to claim 2, wherein the cover (15) of the general housing (7) is designed so that it drops off obliquely toward the periphery.

6. The precision balance with the weighing surface on top according to claim 5, wherein the balance scale (11) is designed as a platform and contacts the receiving bearings (9) of the balance scale carrier (3,8) via at least three bolt-shaped intermediary members (10) or is supported via at least three receiving bearings (9'"'"') on bolt-shaped intermediary members (10) of the balance scale carrier (3,8).

7. The precision balance with the weighing surface on top according to claim 6, wherein the casings (12) are a component of the housing cover (15) and the side walls (14) and jointly form a one-piece molded plastic part (12,14,15) whose side walls (14) are supported on the base plate (13).