Compass, in particular for ski and competition track finding

• US 3,978,591 A
• Filed: 10/07/1974
• Issued: 09/07/1976
• Est. Priority Date: 11/06/1973
• Status: Expired due to Term

• Current Assignee: Erkki Kalle Jaaskelainen
• Original Assignee: Erkki Kalle Jaaskelainen
• Inventors: Jaaskelainen, Erkki Kalle
• Primary Examiner(s): Aegerter, Richard E.
• Assistant Examiner(s): Stephan, Steven L.
• Application Number:
  US05/512,927
• Time in Patent Office: 701 Days
• Field of Search: 33/262, 33/272, 33/334, 33/347, 33/355, 33/370, 33/371, 33/372, 33/373, 24/3 R, 24/16 R, 24/197, 24/200, 24/265 WS
• US Class Current: 33/334
• CPC Class Codes: G01C 17/18 Supporting or suspending compasses, e.g. by gimbal, by flotation
• CPC Class Codes: Y10T 24/1368 Arm or leg carried holder
• CPC Class Codes: Y10T 24/4782 Watch strap

Abstract

A compass, in particular one intended to be used for track finding on skis or in track finding races, which is affixed to the user'"'"'s hand with a strap, and which compass is eminently convenient to use in said circumstances. The invention is particularly characterized in that the strap, one end of which has been affixed to the compass, passes slidably through an aperture in the base plate of the compass, forming an adjustable thumb loop, and that the part of the strap protruding from the aperture has a length enabling the strap to be wound around the wrist, and that the end portion of the strap can be secured in connection with compass or with the strap by buckle or equivalent so that the compass will be positioned upon the upper edge of the hand, adjacent to the thumb groin. The buckle or equivalent may be attached to the thumb loop.

Claims

1. In combination with a compass having a compass needle box containing a compass needle, compass graduations and a base plate with an opening, a device adapting the compass for use in cross-country track finding and in track finding on skis, said device being adapted to affix the compass to the wrist of a user having a hand and a thumb notch, the device being affixable upon the upper edge of the hand adjacent to the thumb notch and comprising an elongated strap, affixed at one end to said base plate and having a free other end, said strap passing complementary slidably through said opening said opening being arranged in said base plate so that as said strap extends therethrough it is held at an angle with respect to said one end so as to define a thumb loop of adjustable size constituting a part of said strap lying between said one end of said strap and said opening, said thumb loop being adapted to encircle the base of a thumb;

and closure means disposed in said thumb loop for affixing said free end of said strap thereto, said strap passing when the compass is attached to the hand, starting from said one end, once around the base of the thumb through said opening and further being adapted to go around the wrist to said closure means.

2. A device according to claim 1, wherein said closure means are mounted upon said thumb loop.

3. A device according to claim 2, wherein said closure means comprises a buckle.