Device for measuring the distances and directions of destinations on road maps

• US 4,835,870 A
• Filed: 05/05/1987
• Issued: 06/06/1989
• Est. Priority Date: 09/07/1985
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Stepper, Norbert, Rauch, Hans, Osterkamp, Eva
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/050,296
• Time in Patent Office: 763 Days
• Field of Search: 33/1 SB, 33/1 D, 33/30 MP, 33/138, 33/471, 33/1 C
• US Class Current: 33/1.00C
• CPC Class Codes: G01C 21/20 Instruments for performing navigational calculations G01C21/24, G01C21/26 take precedence

Abstract

A device for measuring the distance and direction of destinations on road maps from a starting point is suggested which serves for the data input of intermediate destinations in navigation devices. The device comprises an angle measuring plate (10) with a 360-degree scale (13) which is arranged concentrically relative to a central borehole (14) and which begins with the north direction. A bracket (11) is supported at the central borehole (14) so as to be rotatable and carries a measuring tape case (12) at its end area (11b) and a guide (20) for a measuring tape (19) at its opposite end area (11c), the measuring tape (19) being arranged in such a way that, when drawn out of the measuring tape case (12), the measuring tape (19) extends away radially in an outward direction with its one lateral edge over the center of the degree scale (13). The input of distance and directional angle of an intermediate destination can be determined with a single adjustment with this device which has a compact construction, small dimensioning and large measuring range (FIG. 3).

Claims

1. In a device for measuring the distance and direction of destinations on road maps from a starting point for the input of intermediate destinations in navigation devices, comprising a transparent angle measuring plate (10) which has a central borehole (14) and a 360-degree scale (13) arranged concentrically relative to the central borehole and having a mark for the north direction for the beginning of said degree scale;

a bracket (11) having one end area, another end area and a middle area and being supported at said central borehole (14) of said angle measuring plate (10) by said middle area (11a) so as to be rotatable and so as to extend in a plane-parallel manner relative to the angle measuring plate, said bracket carrying a measuring tape case (12) positioned at said one end area (11b);

means for fastening said measuring tape case (12) on said bracket in such a way that said measuring tape case can be folded down out of a vertical working position toward said angle measuring plate (10), the improvement comprising said bracket (11) having a guide (20) at said another end area (11c) for the measuring tape (19) which can be drawn out of said measuring tape case (12), said guide (20) being arranged in such a way that said measuring tape (19), when drawn out, extends away radially in an outward direction with its one lateral edge over a center of said scale (13) on said angle measuring plate (10);

means to lock said measuring tape case in the vertical working position on said bracket, said lock means including a projection (24) provided on said bracket, said fastening means including a housing accommodating said measuring tape case and supported on said bracket and being lockable by said lock means in said working position at said projection of said bracket.

2. Device according to claim 1, wherein said projection (24) of said bracket (11) clamps said measuring tape (19) at said housing (21) in said working position of said measuring tape case (12), which is provided with a restoring spring.

3. Device according to claim 2, wherein said measuring tape (19) has a free end which carries a handle clip (31) forming a stop at said housing (21) of said measuring tape case (12) when said measuring tape (19) is rolled in and having a longitudinal side which is aligned with said measuring tape (19) and said edge (29) of said bracket (11) and comprises a notch (33) at said free end (19a) of said measuring tape (19).

4. Device according to claim 1, wherein said guide of said measuring tape (19) at said end area (11c) of said bracket (11) remote of said measuring tape case (12) includes two guide ribs (20) which are formed laterally at said bracket (11), said measuring tape (19) being guided between said two guide ribs (20).

5. Device according to claim 1, wherein said measuring tape has a longitudinal side leading over the center of said scale (13), and said bracket (11) comprises an edge (29) in said end area (11c) which covers said scale (13) of said angle measuring plate (10), which edge (29) is aligned with said longitudinal side of said measuring tape (19) leading over the center of said scale (13).

6. Device according to claim 1, said fastening means including a hinge (22) by means of which said housing (21) is supported on said bracket.

7. Device according to claim 1, said lock means including a catch (23) by means of which said housing is lockable in said working position at said projection (24) of said bracket (11).

8. Device according to claim 7, wherein said housing has a support (27) for said measuring tape (19), said support (27) being formed on said housing (21) of said measuring tape case (12) near said catch (23), said support (27) effecting a clamping of said measuring tape (19) with said projection (24) of said bracket (11) in said working position of said measuring tape case (12) and cancelling said clamping when said measuring tape case is folded down.