US3675939A - Snowmobile ski and blade construction - Google Patents

Snowmobile ski and blade construction Download PDF

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Publication number
US3675939A
US3675939A US3675939DA US3675939A US 3675939 A US3675939 A US 3675939A US 3675939D A US3675939D A US 3675939DA US 3675939 A US3675939 A US 3675939A
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Prior art keywords
ski
blade
edge
web
snowmobile
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Albam M Vik
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DEMPCO Inc
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DEMPCO Inc
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62BHAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B17/00Accessories or details of sledges
    • B62B17/02Runners
    • B62B17/04Runners resiliently suspended
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62MRIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M27/00Propulsion devices for sledges or the like
    • B62M27/02Propulsion devices for sledges or the like power driven
    • B62M2027/025Snow mobiles characterised by the skis

Abstract

A blade for a snowmobile ski which consists of a narrow vertically disposed blade body adapted to be mounted on the longitudinal edge of a snowmobile ski in a position to depend downwardly. The forward portion of the blade curves upwardly to conform to the front of the ski. The blade is preferably provided with an integral horizontal web that is bolted or welded to the edge of the ski and lies in a abutting face to face relationship with the ski.

Description

I United States Patent 1151 3,675,939 Vik 1451 July 11, 1972 [54] SNOWMOBILE SKI AND BLADE 3,545,560- 12/1970 Fox ..l80/5 TI CONSTRUC 0N FOREIGN PATENTS OR APPLICATIONS [72] Invent New Bnghmn' 396,225 1/1909 France ..280/2l [73] Assignee: Dempco, Inc., Minneapolis, Minn.

Primary ExaminerRichard J. Johnson [22] F'led: March 1970 Armrne \'.lames V. Harmon .1211 Appl. No.: 15,603

. [57] ABSTRACT 52 us. c1. ..280/28, l80/5 R A blade for a Snowmobile Ski which consists of a narrow veni- 51 Int. Cl ..B62m 27/02 Cally disposed blade body adapted to be mounted on 58 Field of Search ..1s0 5- 280/21 25 26 2s Eimdinal edge a snwmbile ski in a depend downwardly. The forward portion of the blade curves upwardly to conform to the front of the ski. The blade is [56] Rem-ems Cl ed preferably provided with an integral horizontal web that is UNITED STATES PATENTS bolted or welded to the edge of the ski and lies in a abutting face to face relationship with the ski. 3,252.533 5/1966 Aeder ..l80/5 1,957,372 5/1934 Thompson ..280/28 3 Claims, 4 Drawing Figures PATENTEDJUL 1 1 1972 3, 675 939 sum 1 BF 2 I N VEN TOR. AlbaM M VI r ATTORNEY PATENTEDJUL 1 1 I972 SHEET 2 OF 2 I N VEN '1' OR.

Al baM I\A.V|K

s q w s ATTO'QAIQY SNOWMOBILE SKI AND BLADE CONSTRUCTION The present invention relates to the steering of motor powered snow vehicles and to skis for such vehicles.

Almost all snowmobiles now being manufactured and sold employ a pair of skis at the front of the vehicle for steering. On a moderately slippery surface the skis have a tendency to allow the vehicle to slide or skid straight ahead even when the handle bars and skis are in the position for a full turn because of the weight of the vehicle and the large size of the track surface in engagement with the snow. To overcome this problem the invention has as its object the provision of an improved snowmobile and ski having the following characteristics and advantages: a) the ability to enable the vehicle to turn on a reduced turning radius when traveling over slippery packed snow or ice; b) the provision of an added margin of safety by allowing improved steering control; c) a means for improving engagement between the ski and the snow when the vehicle makes a turn without increasing drag when the vehicle is not in a turn; d) the strengthening of the ski.

In the figures,

FIG. 1 is a perspective view of a snow-mobile embodying the invention.

FIG. 2 is a front elevational view of a ski.

FIG. 3 is a plan view ofa ski, and

FIG. 4 is a perspective view ofa ski.

Briefly, the present invention provides a snowmobile having a vehicle body with propulsion means thereon and a steering ski mounted for turning about an inclined axis. The ski is pro-- vided with a drop center and at least one longitudinally extending laterally located downwardly depending steering blade is positioned on the side edge of the ski with its lower longitudinally extending edge located somewhat above the elevation of the drop center part of the ski.

In the F IGS., the snowmobile includes the usual vehicle body 12, propulsion system 14, of which only the track can be seen, and a pair of ski supporting and steering shafts l6 and 18 mounted for pivotal movement upon axes that are parallel to one another and inclined such that their lower ends are located forwardly of their upper ends. The shafts l6 and 18 are secured as by welding at 20 and 22, respectively (FIGS. 3 and 4) to tubes 24 and 26 mounted upon U shaped brackets 32 by pivot pins 30.

It can thus be seen that the position of the inclined steering shafts l6 and 18 will cause the skis mounted at their ends to tilt to the side when the shafts are turned by the handle bars.

Since the left and right skis are identical, only one will be described in detail.

Each U shaped bracket 32 includes parallel side portions 320 and 32b. Rigidly affixed to the lower surface of bracket 32 is a leaf spring 34 having its forward and rearward ends 340 and 34b respectively secured to laterally disposed pivots 36 and 38 which are supported upon brackets 40 and 42, respectively. Both of the brackets 40 and 42 are secured to the body of the ski 44 preferably by welding.

The ski 44 includes a pair of flat longitudinally extending coplanar side sections 46 and 48 which are co-extensive with a rear section 49 that is slightly upturned as seen in FIG. 4. The forward portions 46a and 48a of the side sections 46 and 48 respectively bend upwardly to define the forward part of the ski. The tip support comprising the steel rod 50 bent to the general form of a letter J is welded between the bracket 40 and the ski tip 52 to strengthen the front end of the ski and provide a handle.

The middle portion of the ski is provided with a trough or drop center 54, as best seen in FIGS. 1, 2 and 4. The drop center 54 extends longitudinally the full length of the ski, including the upturned forward portion defined by portions 460 and 48a but does not extend into the upturned portion 49.

A longitudinally extending rod 56, only a portion of which can be seen in FIGS. 1 and 2, is welded to the lower surface of the drop center 54 and extends the entire length of the ski to provide the ski with greater resistance to wear and abrasion.

As best seen in FIG. 2, the drop center portion 54 supports the other parts of the ski, including the side sections 46 and 48 a substantial distance above the surface of the snow 60 under hard packed conditions.

The steering blades in accordance with the invention will now be described.

Each ski 44 is provided with a pair of steering blades comprising the left and right steering blades 62 and 64. The blades 62 and 64 can be used either two to a ski or one to a ski. Each of the left blades 62 are identical, as are each of the right blades 64. Each left blade 62 consists of a vertically disposed longitudinally extending web 66 which is the functional portion of the blade and an integral horizontally disposed web 68 secured at longitudinally spaced intervals to section 46 of the ski by bolts 70 or other suitable fasteners.

Both of the webs 66 and 68 bend upwardly the forward portion of the ski to conform to the upturned section 46a. It should be noted that the web 66 is located near the lateral edge of the ski and that its lower edge 72 is at a higher elevation than the lower edge of the drop center 54. This provision insures that the web 66 will not contact the ground when the skis are running straight ahead over a hard surface.

The right blades are constructed in a similar manner, including horizontal and vertical webs and 82 respectively. secured to the horizontal sections 48 by bolts or other suitable fasteners 84. Both sections 80 and 82 bend upwardly to conform to the forward portion of the ski. The lower edge 86 of web 82 is at a proper elevation to remain out of contact with the ground or hard packed snow 60 when the drop center rests on the ground.

Refer now to FIGS. 1 and 2 with regard to the manner in which the blades operate when the vehicle is in use. As shown in FIG. 2, the blades 62 and 64 are out of contact with the snow when on a hard surface if in an upright vertical position. Whenever the vehicle is engaged in a turn as shown in FIG. 1, owing to the angle of inclination of steering shafts l6 and 18, the skis 62 and 64 will tilt or cant to one side such that when a left turn is being negotiated, their left lateral edges will be lower than their right lateral edges.

Thus, as seen in FIG. 1, the right ski edges and blades 64 would be raised enough to be partially or entirely out of engagement with the snow 60 when a left turn is being made and a substantial portion of the weight of the vehicle will be transferred to the blades 62. Accordingly, the blade 62 will provide a highly effective engagement with the snow and enable the vehicle to turn on a radius that is virtually the same as its theoretical turning radius even when traveling at a high speed and in this way very effectively prevent the vehicle from side slipping as well as providing better steering control. Similarly, when the vehicle is making a right turn, blade 64 will be engaged with the snow and blade 62 will be elevated above the surface of the snow.

In summary, this invention makes possible sharp turns on hard packed snow or on ice as well as improving the steering control that can be obtained by the operator. Because blades 62 and 64 have their lower edges spaced above the elevation of drop center 54, they do not contact the ground and increase drag on the vehicle traveling straight ahead. Since the webs 66 and 82 are spaced relatively far apart, snow does not tend to compact between them.

If the skis are made of 16 gauge steel, blades 62 and 64 made of 12 gauge steel have been found suitable. Since most snowmobile skis are made of 16 gauge steel, it will be seen that the blades strengthen the ski substantially. The upwardly curved portions at the forward ends of the blades prevent damage by stones or other obstructions. While the dimension of the blades can be varied considerably, several hundred units in which the webs 66, 82 had a height of three-quarter inch performed admirably for extended periods of time.

I claim:

1. A substantially straight snowmobile ski having a flat normally horizontally disposed elongated body formed from sheet material with an upwardly curved forward portion, a longitudinally extending drop center supporting surface extending longitudinally of the ski and having a lower surface substantially below the lower surface of the lateral edges of the ski body, at least one longitudinally extending vertically disposed blade member fixedly positioned in the vicinity of one lateral edge of the ski and depending downwardly therefrom, said blade extending forwardly to substantially the forward tip of the ski and rearwardly along a major portion of the length of said ski, and having a lower edge positioned at a higher elevation than the lower surface of the drop center portion, the forward portion of the blade being curved upwardly to conform to the front upwardly curved portion of the ski body.

2. The combination of claim 1 wherein a normally horizontally disposed web of sheet metal is integral with the blade body and extends at right angles thereto from the upward edge thereof toward the ski center, said web being adapted to be secured in face to face abutting relationship with the edge of the ski and thereby support the blade.

3. The snowmobile ski of claim 1 wherein said blade includes a horizontally disposed web integral with the vertically disposed blade, said web being rigidly affixed to the ski and being positioned in a face to face abutting relationship therewith.

Claims (3)

1. A substantially straight snowmobile ski having a flat normally horizontally disposed elongated body formed from sheet material with an upwardly curved forward portion, a longitudinally extending drop center supporting surface extending longitudinally of the ski and having a lower surface substantially below the lower surface of the lateral edges of the ski body, at least one longitudinally extending vertically disposed blade member fixedly positioned in the vicinity of one lateral edge of the ski and depending downwardly therefrom, said blade extending forwardly to substantially the forward tip of the ski and rearwardly along a major portion of the length of said ski, and having a lower edge positioned at a higher elevation than the lower surface of the drop center portion, the forward portion of the blade being curved upwardly to conform to the front upwardly curved portion of the ski body.
2. The combination of claim 1 wherein a normally horizontally disposed web of sheet metal is integral with the blade body and extends at right angles thereto from the upward edge thereof toward the ski center, said web being adapted to be secured in face to face abutting relationship with the edge of the ski and thereby support the blade.
3. The snowmobile ski of claim 1 wherein said blade includes a horizontally disposed web integral with the vertically disposed blade, said web being rigidly affixed to the ski and being positioned in a face to face abutting relationship therewith.
US3675939D 1970-03-02 1970-03-02 Snowmobile ski and blade construction Expired - Lifetime US3675939A (en)

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Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777831A (en) * 1972-04-03 1973-12-11 D Hale Dirigible system for snowmobiles
US3785665A (en) * 1972-01-26 1974-01-15 Valmet Oy Ski for snow vehicle
JPS4963648U (en) * 1972-09-14 1974-06-04
US3817544A (en) * 1971-06-04 1974-06-18 R Labelle Ski for snowmobile
US3844367A (en) * 1973-07-26 1974-10-29 H Flohr Snowmobile ski system
US3871675A (en) * 1973-01-05 1975-03-18 Arctic Ets Snowmobile ski
JPS5041213U (en) * 1973-08-14 1975-04-26
US3897839A (en) * 1974-05-15 1975-08-05 Bombardier Ltd Ski snow deflector
US5145195A (en) * 1990-10-24 1992-09-08 Campbell Norman A Steering skis for snowmobiles and similar vehicles
US5443278A (en) * 1992-12-22 1995-08-22 Berto; Joseph J. Snowmobile ski liner
US5474146A (en) * 1988-12-06 1995-12-12 Honda Giken Kogyo Kabushiki Kaisha Snow vehicle
US5599030A (en) * 1993-10-15 1997-02-04 Campbell; Norman A. Wear rods for skis of snowmobiles and similar vehicles
US5836594A (en) * 1992-12-09 1998-11-17 Simmons, Inc. Snowmobile ski
US6276699B1 (en) * 1998-02-25 2001-08-21 Verlin M. Simmons Snow machine ski
US6378889B1 (en) 1999-04-05 2002-04-30 Yamaha Hatsudoki Kabushiki Kaisha Steering ski for snow vehicles
US6520512B1 (en) * 2000-02-21 2003-02-18 Ghislain Lachance Snow vehicle stabilizer
US6626444B2 (en) 1993-08-12 2003-09-30 Polaris Industries Inc. Snowmobile steering ski
US20030234500A1 (en) * 2002-06-21 2003-12-25 Allen Roberts Snowmobile ski
US20040099458A1 (en) * 2002-11-21 2004-05-27 Andre Meunier Snowmobile ski having a self-steering keel arrangement
US20050017465A1 (en) * 2003-07-24 2005-01-27 Bergstrom Skegs, Inc. Wear rod for a snowmobile ski
US20050173873A1 (en) * 2004-02-05 2005-08-11 Ronald Ruzewski Steering ski for snow vehicle
EP1607302A1 (en) * 2004-06-18 2005-12-21 Chung-Hsiu Su Sled with a braking mechanism
US20050280223A1 (en) * 2004-06-18 2005-12-22 Chung-Hsiu Su Sled with a braking mechanism
US20060033294A1 (en) * 2002-06-21 2006-02-16 Allen Roberts Snowmobile ski
USRE39012E1 (en) 1993-08-12 2006-03-14 Polaris Industries Inc. Snowmobile steering ski
US20060145534A1 (en) * 2005-01-03 2006-07-06 Musselman Robert S Stamped dual snowmobile runner and method of manufacture
US7195254B2 (en) * 2002-04-04 2007-03-27 Brp Finland Oy Adjustable ski for a snowmobile
US7243927B2 (en) 2001-11-20 2007-07-17 Yamaha Hatsudoki Kabushiki Kaisha Steering ski for snow vehicle
US7287763B1 (en) * 2006-09-29 2007-10-30 9158-7782 Quebec Inc. Method of attachment of a ski on a snowmobile, and resulting snowmobile
US20100187780A1 (en) * 2006-03-17 2010-07-29 Simmons Verlin M Snow Machine Ski
US8641055B2 (en) 2006-03-17 2014-02-04 Verlin M. Simmons Snow machine ski
US9731746B2 (en) * 2015-03-04 2017-08-15 C3 Powersports 2014 Ltd. Ski for a snow vehicle

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004017950A (en) 2002-06-20 2004-01-22 Yamaha Motor Co Ltd Steering skiing device of snowmobile

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR396225A (en) * 1908-11-13 1909-04-05 Nikolaus Leszl single track sled System
US1957372A (en) * 1932-07-06 1934-05-01 Morris T Thompson Sleigh runner
US3252533A (en) * 1963-08-19 1966-05-24 David J Aeder Snow scooter
US3545560A (en) * 1968-11-18 1970-12-08 Sports Power Inc Motorized snow vehicle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR396225A (en) * 1908-11-13 1909-04-05 Nikolaus Leszl single track sled System
US1957372A (en) * 1932-07-06 1934-05-01 Morris T Thompson Sleigh runner
US3252533A (en) * 1963-08-19 1966-05-24 David J Aeder Snow scooter
US3545560A (en) * 1968-11-18 1970-12-08 Sports Power Inc Motorized snow vehicle

Cited By (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3817544A (en) * 1971-06-04 1974-06-18 R Labelle Ski for snowmobile
US3785665A (en) * 1972-01-26 1974-01-15 Valmet Oy Ski for snow vehicle
US3777831A (en) * 1972-04-03 1973-12-11 D Hale Dirigible system for snowmobiles
JPS4963648U (en) * 1972-09-14 1974-06-04
JPS541721Y2 (en) * 1972-09-14 1979-01-25
US3871675A (en) * 1973-01-05 1975-03-18 Arctic Ets Snowmobile ski
US3844367A (en) * 1973-07-26 1974-10-29 H Flohr Snowmobile ski system
JPS5041213U (en) * 1973-08-14 1975-04-26
US3897839A (en) * 1974-05-15 1975-08-05 Bombardier Ltd Ski snow deflector
US5474146A (en) * 1988-12-06 1995-12-12 Honda Giken Kogyo Kabushiki Kaisha Snow vehicle
US5145195A (en) * 1990-10-24 1992-09-08 Campbell Norman A Steering skis for snowmobiles and similar vehicles
US5836594A (en) * 1992-12-09 1998-11-17 Simmons, Inc. Snowmobile ski
US5443278A (en) * 1992-12-22 1995-08-22 Berto; Joseph J. Snowmobile ski liner
USRE39012E1 (en) 1993-08-12 2006-03-14 Polaris Industries Inc. Snowmobile steering ski
US6626444B2 (en) 1993-08-12 2003-09-30 Polaris Industries Inc. Snowmobile steering ski
US5599030A (en) * 1993-10-15 1997-02-04 Campbell; Norman A. Wear rods for skis of snowmobiles and similar vehicles
US6276699B1 (en) * 1998-02-25 2001-08-21 Verlin M. Simmons Snow machine ski
US6378889B1 (en) 1999-04-05 2002-04-30 Yamaha Hatsudoki Kabushiki Kaisha Steering ski for snow vehicles
US6513612B2 (en) 1999-04-05 2003-02-04 Yamaha Hatsudoki Kabushiki Kaisha Steering ski for snow vehicles
US6520512B1 (en) * 2000-02-21 2003-02-18 Ghislain Lachance Snow vehicle stabilizer
US7243927B2 (en) 2001-11-20 2007-07-17 Yamaha Hatsudoki Kabushiki Kaisha Steering ski for snow vehicle
US7195254B2 (en) * 2002-04-04 2007-03-27 Brp Finland Oy Adjustable ski for a snowmobile
US8915503B2 (en) * 2002-06-21 2014-12-23 Starting Line Products, Inc. Snowmobile skis having elongated wing members
US20080246237A1 (en) * 2002-06-21 2008-10-09 Starting Line Products, Inc. Sway bar for snowmobiles
US7841089B2 (en) 2002-06-21 2010-11-30 Starting Line Products, Inc. Methods of manufacturing snowmobile skis
US6991056B2 (en) * 2002-06-21 2006-01-31 Starting Line Products, Inc. Snowmobile ski
US20060033294A1 (en) * 2002-06-21 2006-02-16 Allen Roberts Snowmobile ski
US20030234500A1 (en) * 2002-06-21 2003-12-25 Allen Roberts Snowmobile ski
US7311166B2 (en) 2002-06-21 2007-12-25 Starting Line Products, Inc. Snowmobile ski
US20080271303A1 (en) * 2002-06-21 2008-11-06 Starting Line Products, Inc. Snowmobile ski
US20060157943A1 (en) * 2002-06-21 2006-07-20 Allen Roberts Snowmobile ski
US20110042909A1 (en) * 2002-06-21 2011-02-24 Starting Line Products, Inc. Snowmobile skis having elongated wing members
US7311165B2 (en) 2002-06-21 2007-12-25 Starting Line Products, Inc. Snowmobile ski
US20040099458A1 (en) * 2002-11-21 2004-05-27 Andre Meunier Snowmobile ski having a self-steering keel arrangement
US7017695B2 (en) 2002-11-21 2006-03-28 Groupe Ppd Inc. Snowmobile ski having a self-steering keel arrangement
US20050017465A1 (en) * 2003-07-24 2005-01-27 Bergstrom Skegs, Inc. Wear rod for a snowmobile ski
US20050173873A1 (en) * 2004-02-05 2005-08-11 Ronald Ruzewski Steering ski for snow vehicle
US7232134B2 (en) 2004-02-05 2007-06-19 Yamaha Motor Corporation, U.S.A. Steering ski for snow vehicle
US20050280223A1 (en) * 2004-06-18 2005-12-22 Chung-Hsiu Su Sled with a braking mechanism
EP1607302A1 (en) * 2004-06-18 2005-12-21 Chung-Hsiu Su Sled with a braking mechanism
US7481437B2 (en) 2005-01-03 2009-01-27 International Engineering And Manufacturing, Inc. Stamped dual snowmobile runner and method of manufacture
US20060145534A1 (en) * 2005-01-03 2006-07-06 Musselman Robert S Stamped dual snowmobile runner and method of manufacture
US8641055B2 (en) 2006-03-17 2014-02-04 Verlin M. Simmons Snow machine ski
US20100187780A1 (en) * 2006-03-17 2010-07-29 Simmons Verlin M Snow Machine Ski
US7287763B1 (en) * 2006-09-29 2007-10-30 9158-7782 Quebec Inc. Method of attachment of a ski on a snowmobile, and resulting snowmobile
US9731746B2 (en) * 2015-03-04 2017-08-15 C3 Powersports 2014 Ltd. Ski for a snow vehicle

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