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US 4,051,599 AGranted
Beam compass
AssigneeFriedrich Frech
InventorAndrej Sinkovec
Life of this patent
Estimating the term…
Abstract
A beam compass consisting of a triangular scale and two trammel heads, each including a hollow slide body having an outer face and three, approximately equiangularly offset inner faces bounding a passage through the slide body. Guide rails project from the inner faces into respective grooves of the scale. An arm projects from the outer face of each slide body at right angles to the scale, and its free end carries an attaching device for a compass point or writing implement.
Claims11
A beam compass comprising:
- a. a trammel head including
- 1. a hollow slide body having an outer face and three, approximately equiangularly offset inner faces bounding a passage extending in a predetermined direction through said slide body,
- 2. a guide rail projecting from each of said inner faces into said passage, each guide rail being elongated in said direction,
- 3. an arm mounted on said slide body and projecting from said outer face perpendicularly to said direction, said arm having a free end remote from said slide, and
- 4. attaching means for attaching a compass point to said free end;
- b. an elongated scale of triangular cross section having three longitudinal faces formed with respective longitudinal grooves,
- 1. said scale being received in said passage,
- 2. said rails respectively engaging said scale in said grooves,
- 3. each of said longitudinal faces being separated from a respective one of said inner faces by a clearance;
- and
- c. clamping means on said trammel head spaced from said rails for securing said slide body to said scale.
8 more elements
Dependencies are inferred from the claim text.