Geometrical instruments – Area integrators – Electrical
Patent
1987-07-22
1989-01-17
Martin, Jr., William D.
Geometrical instruments
Area integrators
Electrical
33 1LE, 33140, G01C 1500
Patent
active
047980036
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a so-called thread meter, which is a device, out of which a thread can be drawn by moving the device away from a place where the free end of the thread is attached. At its outfeed, the thread is caused to actuate a counter, which records the length of thread fed out.
Such thread meters are per se previously known. The known thread meters, however, are arranged so that the thread prior to its leaving the device is passed and fed through several holes.
This implies two substantial disadvantages. One of them is, that it is very difficult in a hard environment, such as in a forest in wintertime or generally under bad weather conditions, to thread a thread, which is of the type sewing thread, through a plurality of small holes. This, however, is required when a thread reel is to be changed. The other disadvantage is, that the maximum feeding speed is extremely limited to prevent the thread from breaking. Such thread meters are used in many different connections when a distance is to be measured. As examples can be mentioned the measuring of distances at forest surveys, measuring of distances for military purposes such as for positioning artillery pieces, measuring of distances at construction work, land surveying, measuring of cable lengths required at power cable drawing etc., as well as in entirely different connections, such as measuring the length of an orienteering course etc.
In certain applications it is desired to be able to measure a distance while using a transport means, such as a car, snow scooter or other vehicle. It is not possible to use known thread meters in such connections, because the thread is so arranged via holes and guides, that it breaks at a low speed, for example 10-15 km/hour.
The present invention solves the aforesaid problems and provides a thread meter with a structure, which is much simpler and cheaper than known thread meters.
The present invention, thus, relates to a thread meter comprising a holder for a thread reel, a counter provided with a rotary measuring wheel and guides for a thread, and an outer casing enclosing those elements, and is characterized, in that a first guide for a thread is located between the holder and the measuring wheel, that a second guide for the thread is formed by means of the casing, which casing consists of a first and a second portion hingedly interconnected, where in said first portion a recess extends from an edge of the wall of the first portion, and where the second portion of the casing is arranged to bridge the opening of the recess along the edge, so that a hole with closed periphery is formed, and that the wheel is located along a line extending between said guides.
The invention is described in greater detail in the following with reference to the accompanying drawing, in which
FIGS. 1 and 2 shows a mechanism relating to the present thread meter and, respectively, a casing, where for the formation of a thread meter according to the invention the mechanism is placed in the casing,
FIG. 3 shows a portion of a third guide in detail,
FIG. 4 shows a first guide in detail.
In FIGS. 1 and 2 a thread meter according to the invention is shown. The numeral 1 designates a mechanism, and the numeral 2 designates a casing. It is only for the sake of clearness, that the thread meter is shown divided in two Figures. The mechanism 1 is so located in the casing 2, that the bottom plate 3 of the mechanism abuts the bottom 5 of the first portion 4 of the casing 2. The casing 2 also comprises a second portion 6, which constitutes a cover, which via hinges 7,8 is hingedly connected with the first portion 4. Upon folding upward the second portion 6, as indicated by the arrow 9, the second portion 6 joins with the first portion 4, so that a parallelepiped box is formed, which entirely encloses the mechanism 1. Suitable snap-in devices 10,11 are provided on the second portion 6 for co-operation with the upper lateral edge 12 of the first portion 4, so that the box can be kept closed.
The mechanism 1 comprises a holder 13 for a thread r
REFERENCES:
patent: 1448931 (1923-03-01), Manning
patent: 2676411 (1954-04-01), Horch
patent: 2706336 (1955-04-01), Gruber
patent: 2747286 (1956-05-01), Bedell
patent: 3253337 (1966-05-01), Ebert
patent: 3763567 (1973-10-01), Hudis
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