US2512985A

US2512985A - Extensible ski stick

Info

Publication number: US2512985A
Application number: US695975A
Authority: US
Inventors: Tveten Gunnar
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-12-28
Filing date: 1946-09-10
Publication date: 1950-06-27
Anticipated expiration: 1967-06-27
Also published as: CH251903A; FR934934A; BE468340A

Description

June 27, 1950 G. TVE'TEN EXTENSIBLE SKI STICK Filed Sept. 10, 1946 Patented June 27, 195,0

UNITED l STATES PATENT OFFICE ycx'rlsrzslnr: sx1 STICK Gunnar Tveten, Alter, near Oslo, Norway Application September 10, 1946, Serial No. 695,975

' 9 Claims.

The present invention relates to extensible ski poles of the type that are -composed of 4two or more relatively displaceable andnlockable members. s

Such poles usually comp-rise two telescopic tubes, for instance, tubes of steel or aluminum, and the outer or upper tube forms the handle and surrounds the tube below.

The novel features which I consider as characteristic for my invention are set forth in particular in the appended claims. The invention itself, however, both as toits construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specie embodiments when read in connection with the accompanying drawings, in which:

Fig. 1 is a view, partly insection,vof a portion of an extensible ski pole illustrating the pole in its extreme collapsed condition;

Fig. 2 illustrates in a similar manner the ski pole when extended to about its maximum length;

Fig. 3 shows on an enlarged scale, an axial section through the top part of the ski vpole shown in Fig. l;

Fig. 4 is a section on lines IV-IV of Fig. 3;

Fig. 5 is a section on lines V-V of Fig. 3;

Fig. 6 is a longitudinal section showing in separate relationship the collar provided at the top of the inner tube and after removal of the spindle emphasized in the device;

Fig. 7 is an end View of the collar; and I Fig. 8 illustrates, on a somewhat larger scale, a section through the top end of the inner tube and collar with the spindle extending from the collar.

As appears from the drawings, the ski pole comprises a generally hexagonal tube I, thatkis movably tted over the tube 2.` vThe latter may extend to the bottom end of the ski pole or it may be secured to the end of a tube of still smaller diameter, which then may form the bottom part of the ski pole. The lowermost portion I of .tube I is cylindrical and closely fits over tube 2'.

Secured in the top end of tube I by means of screws 4 is a hexagonal metallic plug 3 having an.

axial bore, in which a spindle 'l is freely rotatable. The top end of said spindle projects somewhat beyond tube I and plug 3 and is provided with a knurled circular or polygonal knob `6, which serves as a finger piece for rotating the yspindle relatively to the outer tube. Suitably the knob is at its underside provided with a recess forming bearing for a ange 3 of the plug 3. Just below the plug 3 the spindle 'I is provided with a stop abut- Norway December 28, 1944 ment for the inner end of the plug in order to prevent axialdisplacement of the spindle.

The abutment may consist of a nut 8 screwed onto the spindle and locked by means of a locking nut 9, or it may be connected to the spindle by welding or the like.

Below plug 3 the spindle 'I is provided with screw threads or transverse serrations 23 which are entirely or in part cut away at two opposite sides of the spindle. For this purpose the spindle is attened slightly so that fiat portions 1 intervene between the threaded portions.` 'Ihe spindle thus attains across sectional shape as shown in Figure 8;

The rod 'I is adapted to be received in an axial opening of a collar or sleeve I0 secured in the top end of the inner tube 2. The collar may be forcetted into the wall of tube 2, or may be secured thereto inra-ny other suitable manner. A hexagonal portion Ill of the collar extends beyond the end of tube 2, and slidably fits into hexagonal tube I. Thus tubes Land 2 are locked against l relative rotation.

The axial bore. ofv the collar or sleeve I0 and `the portion, I 0 thereof areprovided with internal screw threads` ortransverse serrations I2 which l cooperate with the external threads or serrations .l is rotated 4to a position where the screw threads of the spindle engage thescrew threads of the collar `I0, I0', the outer tubewill be locked to the inner tube '2. If the `ski poleis to be extended or shortened, the knobk 6 'and thus also the spindle 1 is rotated about to .that angular position where the threads of the spindle are entirely out of engagement with the threads of the collar I0, I0. .f The screw threads. or the spindle then will be located in the spaces I I, Figure 8, of the collar. Now spindle 1 and thus also outer tube I may be displaced longitudinallyluntil the ski pole attains the desired length, whereafter locking is effected byturning thelspindle l, by means of knob 6, by 90, into` a positionwhere the screw threads of spindle and, collar engage. l

In order tofprevent that the spindle 'I be entirely pulled out ofv collar I0, I0', the inner end portiony of the spindle.4 may have screw threads 3 about its entire periphery. On assembling the pole, such end portion must then be screwed entirely through the collar. Preferably, however, the inner end of the spindle i-s provided with a suitable stop abutment, for instance in the shape of nuts I3.

In order to easily ascertain the two angular positions of the spindle in locked and unlocked condition, a ball or the like- I5 is provided in each of say, two opposite holes. The balls are actuated by spring I4 and are adapted to rest alt ternatively in one or the other wall of recesses I6, disposed at positions displaced 909 relatively in each other on the underside-of. knob 6.. When the spindle is in locked or in unlocked position,

the balls are pressed into therecesses lli.` Whenthe spi1idle-.isrotated from one posi-ticntoanlother, a certain force must be exerted1 in order to bring the balls outv ofthe recesses and the correct angular position of the spindle may thus easily be ascertained.

When the spindle. I is rotated from locked to. unlocked position. the screw threads" on the spindle. must be locatedl just i'n front of the cut away thread portions of collarv Ill. v In' order to ensure that the spindlev is in. such proper position, the collar Ill is provided withzfor instance,

two radial holes I'I, in which are' seated balls I8. The balls are urged toward the" spindlepby' means of springs [9. The. holes are. `diam'etrically opposed andare spaced' axially by a' distance cor'- responding to one or several' thread pitches. Further, the holes have such angular'position's, that the balls .I8 are pressed against the threads' of spindle 1: when the latter. is in unlocked position.

When the spindle is moved the" balls willride over the threads and thus causeV a vibration" which is audible and tangible.. When ythe spindlejis stopped in a' certain'v position forlocking, itA is easy to feel whether the balls are in between. two

threads.

The collar ID, III' is providedat' its endswith shorthelical springs and 2| wlii'chare`V secured in grooves 22. When the spindle'l isjmove'd to one ofv its endl positions,l one or the other spring reception ofrth'e spindle and a wider bore' for receptionY of the; collar.

It will be understood' thatjeaclr of the velements described above, orY two or more together; may also' find a useful application in other' types' of -ski'pol'es. diiering' fromthetype described above.

While I have illustrated and described the inventon as embodied in'ski" poles' having' two telescoping. tubes, I donot intend to belimited to the details shown', sincejvarious modifications and structural changesma'y be made without departing in' any way from the spirit of my'i'nvention.

Without further analysis, the foregoing' will so fully reveal the gist of my invention that others can by applying current knowledge readily' adapt it for. various yapplicatibicisl without omitting features that, from the. standpoint of prior art, fairly constitute essential' characteristics ofthe generic Y or specific aspectsv of this` invention and; tliere# fore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

What I claim as new and desire to secure by Letters Patent is:

l. An extensible ski pole comprising in combination a plurality of telescoping tubes; a spindle rotatably mounted in one of said tubes; a collar encircling; said spindle andlb'eing operatively connectedv to another of" said tubes; cooperating transversal serrations provided at spaced longitudinal portions of said spindle and collar; and, intervening said serrated portions, flattened portions extending. lengthwise of said Spindle and collar whereby a relative turning of the spindle and.' the collarrwill: bring alternatively said ser-1 rations into engagement and said flat portions into. register and will thus effect locking or unlocking ofsaidtubes against relative axial movement.Y

2. extensible' skil pole comprising in combination a. pair of telescoping tubes; a plug mounted in the-top end of the outer tube-and being provided with an axial bore; a spindle extending' through said bore and rotatable therein; meansforlocki'ng-'said spindle against axial movement relative toA said plug.; handle means disposed at the outer end of the spindle for rotatin'gt'he same; a collar encirclingsaid spindle and being operatively' connectedto the inner tube;

means for preventing relativev rotation of said tubes ;L cooperative transversal serrations provided at spaced longitudinal-'portions of vsaidV spindie aridcollar; and, intervening said' serrated portions, attened portions extending lengthwise of said spindleY and collar' whereby a relative turnnation a pair of't'elescoping tubes; a spindle rotatably mounted' in the outer of said tubes; a collarencirclingsaict spindle and being/connected to the top end of the'inne'r of said? tubes; means for preventing relative rotation of said tubes; cooperating transversal serrations provided at spaced longitudinal. portionsl of saidv spindle and collar; and', intervening said serrated portions,

flattened portions extending lengthwise` of said spindle. and-"collar whereby a relative turning' of tle spindle' and the collar.' will bring alternatively said Vserrations?into engagement and said flat portion'ssi'nto regfifster'and will thuseffect locking or unlocking of said* tubes-f against relative axial movement; Y. f' 1 1 5. An; extensible ski. pole comprising in combination; a generally? polygonal. outer'rod.; an inner rod; a spindle rotatably mounted inl vsaid outer rod.; apolygonal` collar encirclingsaid spindle andI being.v slidably fitted. in said outer .rodl and bei-ng. connected. to said inner rod; cooperating transversal serrations provided at spaced longitudinal portions of. said spindle and collar.; and, intervening said serratedA portions, flattened portions extend'ing lengthwise. of said spindle and collar whereby a relative turning of the spindle andthe collar will bring alternatively said serrations into engagement andsaid lia-t portions into register and will thus eiect locking or unlocking of said rods against relative axial movement.

6. An extensible ski pole comprising in combination a plurality of telescoping tubes; a spindle rotatably mounted in one of said tubes; a collar encircling said spindle and being operatively connected to another of said tubes; end abutments provided on said spindle for limiting axial movement of the same with relation to said collar; resilient means disposed at the ends of said collar for coaction with said abutments in the two axial end positions of said spindle; cooperating transversal serrations provided at spaced longitudinal portions of said spindle and collar; and, intervening said serrated portions, flattened portions extending lengthwise of said spindle and collar whereby a relative turning oi the spindle and the collar will bring alternatively said serrations into engagement and said flat portions into register and will thus effect locking or unlocking of said tubes against relative axial movement.

7. A n extensible Ski pole comprising in combination a pair of telescoping tubes; a plug mounted in the top end of the outer tube and being provided with an axial bore; a spindle extending through said bore and rotatable therein; means for locking said spindle against axial movement relative to said plug; handle means disposed at the outer end of the spindle for rotating the i same; a collar encircling said spindle and being operatively connected to the inner tube; means for preventing relative rotation of Said tubes; a handle piece, the said handle piece resting with its underside on said plug; a plurality of spaced recesses and spring actuated elements provided on said plug and said handle piece for releasably holding said handle piece and spindle in selected angular positions; cooperative transversal serrations provided at spaced longitudinal portions of said spindle and collar; and, intervening said serrated portions, fl'attened portions extending lengthwise of said spindle and collar whereby a relative turning of the spindle and the collar will bring alternatively said serrations into engagement and said flat portions into register and will thus effect locking or unlocking of said tubes against relative axial movement.

8. An extensible ski pole comprising in combination a plurality of telescoping tubes; a spindle rotatably mounted in one of said tubes; a collar encircling said spindle and being operatively connected to another of said tubes; cooperating transversal,serrations provided at spaced longitudinal portions of said spindle and collar; a plurality of axial bores provided in said collar; a plurality of spring actuated elements disposed in said bores for yieldingly bearing against the serrated portions of said spindle; and, intervening said serrated portions, flattened portions extending lengthwise of said spindle and collar whereby a relative turning of the spindle and the collar will bring alternatively said serrations into engagement and said flat portions into registe: and will thus eiect locking or unlocking of said tubes against relative axial movement.

9. An extensible siii pole comprising in combination a plurality of telescoping tubes; a spindle rotatably mounted in one of said tubes; a collar encircling said spindle and being operatively connected to another of said tubes; end abutments provided on said spindle for limiting axial movement of the same with relation to said collar; resilient means disposed at the ends of said collar for coaction with said abutments in the two axial end positions of said spindle; cooperating transversal serrations provided at spaced longitudinal portions of said spindle and collar; and, intervening said serrated portions, flattened portions extending lengthwise of said spindle and collar whereby a relative turning of the spindle and the collar will bring alternatively said serrations into engagement and said flat portions into register and will thus effect locking or unlocking of said tubes against relative axial movement.

GUNNAR TVETEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,665,811 Hadden Apr. 10, 1928 2,275,330 Tveten Mar. 3, 1942 FOREIGN PATENTS Number Country Date 141,300 Austria Apr. 10, 1935