Compression tester

• US 3,979,960 A
• Filed: 08/25/1975
• Issued: 09/14/1976
• Est. Priority Date: 08/25/1975
• Status: Expired due to Term

• Current Assignee: Rite Autotronics Corporation
• Original Assignee: Rite Autotronics Corporation
• Inventors: Schwartz, Edwin L.
• Primary Examiner(s): Woodiel, Donald O.
• Application Number:
  US05/607,120
• Time in Patent Office: 386 Days
• Field of Search: 73/115, 73/120, 73/419, 73/116
• US Class Current: 73/744
• CPC Class Codes: G01L 19/16 Dials; Mounting of dials
• CPC Class Codes: G01L 23/02 mechanically indicating or recording and involving loaded or return springs
• CPC Class Codes: G01L 7/166 with mechanical transmitting or indicating means

Abstract

A compression tester having a rotatably mounted dial disc cooperating with a stationary index line and a piston responsive to compression pressure movable against a spring for rotating the dial disc and a support plate for the dial disc providing for confined movement of the dial disc and low friction resistance to movement.

Claims

1. A compression tester for measuring the compression pressure in a cylinder comprising:

a casing containing a cylinder connected by a passage to the pressure to be measured;

a piston in said cylinder movable against a spring in response to pressure in said passage;

a piston rod rigidly connected to said piston and a rack gear rigidly connected to said piston rod;

guide means rigid with said casing;

means rigid with said piston rod and guided by said guide means for guiding the movement of said rack gear;

a rotatably supported dial means having an axial projection comprising a pinion gear in mesh with said rack gear; and

a stationary index means carried by said casing for coaction with said dial means to measure pressure.

2. A compression tester as defined in claim 1;

a stationary support plate secured to said casing and having an axial center opening for rotatably supporting said dial means.

3. A compression tester as defined in claim 2;

stationary cover means over said dial means and containing said index means.

4. A compression tester as defined in claim 3;

post means rigidly secured to said casing;

said support plate and cover means having edge projection contain opening receiving said post means and means for securing said projections to said post means.

5. A compression tester for measuring the compression pressure in a cylinder comprising;

a casing containing a cylinder connected by a passage to the pressure to be measured;

a piston in said cylinder movable against a spring in response to pressure in said passage;

a piston rod connected to said piston and having a first plate rigidly connected to the end of said piston rod for movement therewith;

a rack gear rigidly carried by said first plate and movable with said piston rod;

a dial support plate attached rigidly to said casing and having a central opening therein;

a dial plate having a central projection extending through and rotatably mounted in said central opening said projection having a pinion gear thereon in mesh with said rack gear;

a dial disc secured to the face of said disc plate and having pressure indicating indicia thereon; and

a cover for said dial disc secured to said casing and having a stationary index line for cooperating with said indicia to obtain a pressure measurement.

6. A compression tester as defined in claim 5 having a second plate connected to said piston rod and spaced from said first plate;

and guide means on one side of said support plate for guiding the movement of both said plates to maintain axial movement of said piston rod.

7. A compression tester as defined in claim 6 wherein said plates are also adjacent said one surface of said support plate to be guided thereby.

8. A compression tester as defined in claim 5;

said dial support plate having a circular ridge on the surface adjacent said dial plate for rotatively supporting said dial plate with low frictional resistance.

9. A compression tester as defined in claim 8 wherein;

said projection contains an axial opening,

a rivet inserted into said opening to secure said dial disc to said dial plate;

said rivet having a rounded head adjacent said cover to confine rotational movement of said dial plate between said circular ridge and said cover plate.