uses a sprung rope to resist the bending of the mast, and SLALOM POLE is, of course, bare of any anchoring in snow or ice.
BACKGROUND OF THE INVENTION SUMMARY OF THE INVENTION
1. Field of the Invention 5 ^ *s therefore one of the principal objects of the inThis invention relates to a pole for use in delineating vention to provide a delineating pole, a visible part of
boundaries, such as a slalom pole marking boundaries which is pivotable upon impact by force, and which along a ski slope and, in particular, to a pole constructed returns to its normally aligned upward position followto facilitate a bending of its upper portion upon impact ing cessation of such a force.
due to a moving object, for example, striking of the pole 10 It is another object to avoid the aforementioned
by a down-hill skier. The instant pole is so constructed drawbacks of the prior art proposals,
as to minimize any injuries to the skier or damages to It is a further object of the invention to provide a
the pole. delineator pole which is pivotable upon impact, and
2. Description of the Prior Art which can be secured firmly into any type of ground Generally, slalom poles are known in the prior art. 15 including one covered by either ice or by deep light One such structure is shown in U.S. Pat. No. snow.
3,279,133 to De Korte. De Korte discloses a boundary Further objects and advantages of the invention will
marker; the upper part of it is adapted to return to the be set forth in part in the following specification and in
vertical position after being struck by a moving object. part will be obvious therefrom without being specifi
This device comprises hollow upper and lower pole 20 cally referred to, the same being realized and obtained
sections which are joined by means of an external spring ^ pointed out in the claims hereof, threaded onto both the upper and lower sections. When
the pole is struck, the spring is flexed, allowing the BRIEF DESCRIPTION OF THE DRAWINGS
upper pole to pivot at ground level and return to the For a fuller understanding of the nature and objects
vertical. A drawback of this device is that the spring 25 of ^ mvention> reference shouid be had to the foUow
itself bends and thus is liable to become distorted upon mg detaiied description, taken in connection with the
contmued use. Furthermore, at ground level the spring accompanying drawings, in which:
is external to the device and susceptible to corrosion FIG. 1 is a fragmentary longitudinal sectional view
and impairment to function due to clogging from such ^ Qn ^ t_t of FIG 2> showin a ferred em_
substances as <krt and ice. 30 bodiment of the present invention;
The device disclosed in U.S. Pat. No. 4,270,873 to TM~ ~ ■ i • 1 i <
T i. 4 i /*L A- A 4. c FIG-2 >s a cross-sectional view taken along line 2—2
Laehy et al. overcomes many of the disadvantages of ^ ^ °
the patent to De Korte by housing the spring within the r-^r^'c . ^ i • • *
pole This eliminates the exposure of the spring to dam- 5°- V^ iT^ sectonal YIewt sumlar t0 a
aging elements. The patent to Laehy, however, suffers 35 P°rtlon of FIG-1 but showm8 a modification,
from the drawback that if the pole is bent more than 90° DESCRIPTION OF THE PREFERRED
there are no means for ensuring that the spring coils are EMBODIMENTS
urged together so as to resurrect the pole to a vertical . .
position. This would therefore require to adjust the pole Referring now to the drawings, m particular FIG. 1, manually after each collision with attendant delays and 40 a P°le 11 K shown which deludes a lower part 30 therefore make it impractical for use in such events as adapted to be placed in the ground and an upper part 15 slalom races. Furthermore, as snow can accumulate in extending upwardly above the ground and which is the lower tubes of the pole, this may cause icing up and adapted to pivot against the lower part 30 when subbreaking of the spring. Another disadvantage of the jected t0 211 impact force.
patent to Laehy is that no anchoring means is provided 45 Tne uPPer pa*115 includes an upper portion 12. The
at the bottom end of the pole to ensure that the pole be lower part 30 includes a lower portion 23. A middle
firmly secured in either ice or in deep light snow, which portion 18 is disposed between the upper 12 and the
are typical environments in slalom races. lower 23 portions, all three portions together forming a
Reference is also made to the U.S. Pat. No. 1,726,817 substantially continuous external surface which is coaxi
to Franklin and the U.S. Pat. No. 2,050,579 to Murray. 50 ally aligned so that the center of the pole 11 is aligned
Both relate to traffic signals. Both of these patents have along the vertical axis X.
a solid pole, the bottom portion of which is inserted in The invention is not restricted to implementation in
a resilient tube. The major drawback of this type of an upright position. Therefore, the terms upper part,
structure is that the upper portions of the pole can be upper portion, lower part, lower portion, middle por
broken off upon impact. 55 tion, upright and vertical axis X are not intended to be
U.S. Pat. No. 3,698,144 to Stratton relates to a de- understood in any limiting sense, but are used only for
tachable post anchor for use with highway marker the purpose of clarity in describing the instant invention
posts. This construction has no resilient means for re- in connection with the specific embodiments shown in
turning the pole to the original position upon impact, the drawings hereof.
and the anchor includes a spike which is to be driven 60 The upper 12, middle 18, and lower 23 portions are
into the ground and therefore requires a great deal of held together in tension by a sprung axial cable 17.
effort in securing it onto an icy surface. The upper portion 12 and the lower portion 23 each
Reference is made to U.S. Pat. No. 2,286,959 to include a respective spring 13, 26 which is coaxially
Haines which relates to a Highway Traffic Post. disposed therein. The upper portion 12 and the lower
Reference is lastly made to U.S. Pat. No. 4,073,254 to 65 portion 23 each includes circular projectiles 45,50. One
Marker which relates to a sailing mast for sailing boards end of each of the springs 13, 26 abut the respective
having a flexible portion at the bottom of the mast for circular projectiles 45, 50. Passages are defined between
bending. A major drawback of this structure is that it the circular projectiles 45, 50 which are sufficiently