US3830323A - Motor sleigh drive track arrangement - Google Patents

Motor sleigh drive track arrangement Download PDF

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Publication number
US3830323A
US3830323A US00276938A US27693872A US3830323A US 3830323 A US3830323 A US 3830323A US 00276938 A US00276938 A US 00276938A US 27693872 A US27693872 A US 27693872A US 3830323 A US3830323 A US 3830323A
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US
United States
Prior art keywords
track
leaf springs
sleigh
bearing means
rollers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00276938A
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English (en)
Inventor
H Vuolevi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Velsa Oy
POLAR METAL PLAST
Original Assignee
POLAR METAL PLAST
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by POLAR METAL PLAST filed Critical POLAR METAL PLAST
Application granted granted Critical
Publication of US3830323A publication Critical patent/US3830323A/en
Assigned to VELSA OY reassignment VELSA OY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: OY POLAR-METAL PLAST AB, IN BANKRUPTCY
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M27/00—Propulsion devices for sledges or the like
    • B62M27/02—Propulsion devices for sledges or the like power driven

Definitions

  • ABSTRACT A motor sleigh has at its rear end an endless propulsion track which, in order to provide a greater area of contact with the terrain over which the sleigh travels, is extended further rearwardly than conventional propulsion tracks.
  • the rearmost portion of the track is guided around rear guide rollers carried on the rear ends of leaf springs extending rearwardly from the sleigh body, and these springs can flex to allow upward deflection of the rearmost portion of the track as it travels over a rise in the terrain.
  • the present invention relates to motor sleighs having at their rear ends endless tracks for propelling the motor sleighs over snow.
  • an object of the present invention to provide a motor sleigh by which the above-described disadvantages are mitigated.
  • a sleigh having at its rear end an endless track the rearmost portion of which is upwardly deflectable relative to the sleigh to adapt to variations in terrain, the rearmost portion of the track being guided around rearmost track guide rollers carried on a shaft journalled in bearings which are supported on the rear ends of leaf springs.
  • the leaf springs extend longitudinally of the motor sleigh and are connected at their forward ends to the rear of the body of the motor sleigh, the connecabling the rearmost portion of the track to adapt to variations in terrain, it is possible to increase the length of the endless track, and thus the area of snow on which the endless track is supported, as compared with conventional sleigh propulsion tracks.
  • Further track guide rollers may be provided spaced forwardly of the rearmost portion of the track and forwardly of the body of the motor sleigh, and may be carried on a shaft which is pivotally connected to the body of the motor sleigh and spring biased downwardly against the lower rung of the endless track.
  • these further rollers are also able to be deflected upwardly as they pass over humps or other rises in the terrain, and they also assist in maintaining the endless track in contact with the snow so as to provide as large an area of contact as possible between the endless track and the snow.
  • FIG. 1 shows a side view of parts of the rear end of a motor sleigh
  • FIG. 2 shows a view taken in section along the line ll--II of FIG. 1.
  • the motor sleigh is provided at its rear end with an endless propulsion track 1 the rearmost end of which is guided around sprocket rollers 2 (of which only one is shown).
  • the rollers 2 are carried on a shaft 3 which is journalled at each end in a respective bearing 5.
  • the bearings 5 are mounted on the rear ends of leaf springs 4, the forward ends of which are connected to the rear part of the body of the motor sleigh on both sides thereof.
  • the bearings 5 supporting the ends of the shaft 3 are arranged to allow the shaft 3 to be deflected through a few degrees from the axis of the bearings 5, as indicated by the arrows in FIG. 2.
  • the leaf springs 4 are connected to the body of the motor sleigh by connecting plates 6, which are so connected to the body of the motor sleigh as to be adjustable longitudinally of the motor sleigh, thus allowing the leaf springs 4 and the rollers also to be adjusted in position longitudinally of the motor sleigh. This enables the tension of the track 1 to be adjusted, and also facilitates dismounting and reassembly of the endless track 1.
  • the connecting plates 6 for the leaf springs 4 are also employed to support a further shaft 7, which is carried on the rearmost ends of arms 9, these arms 9 being so connected to the connecting plates 6 as to be pivotable about-a horizontal axis to allow vertical deflection of the shaft 7.
  • Springs 8 are provided for biasing the shaft downwardly, thereby to press further track guide rollers 10 carried by the shaft 7 against the lower run of the endless track 1.
  • the rearmost portion of the endless propulsion track 1 can be deflected upwardly by variations in the terrain over which the motor sleigh is travelling into the position illustrated by dot and dash lines in FIG. 1.
  • the spring-biased rollers 10 pressing against the lower run of the endless propulsion track 1 help to maintain as large an area as possible of the lower run of the endless propulsion track 1 in contact with the terrain to improve the grip of the endless propulsion track 1 on the terrain.
  • the leaf springs 4 are substantially horizontal, and the leaf springs 4 and the axis of the rearmost track guide rollers 2 are disposed at a level below that of the axis of the shaft 7 carrying the further track guide rollers 10. Consequently, the rearmost portion of the endless track 1, when in its normal at rest position, will form a straight continuation or rearward extension of the rest of the track system of the motor sleigh.
  • the further track guide rollers 10 add to the rigidity of the rearmost portion of the track with respect to torsion about the longitudinal axis of the motor sleigh, so that less torsional stress will be exerted on the bearings 5.
  • a motor sleigh having a body, an endless terrainengagement track for propelling said body, track guide means for guiding said track around an endless path, said track guide means including rearmost track guide means, bearing means rotatably supporting said rearmost track guide means, leaf springs extending rearwardly from said body and connected to said bearing means, means connecting the foremost ends of said leaf of first track guide rollers spaced rearwardly from said body, and a pair of second track guide rollers spaced rearwardly of said body and forwardly of said first track guide rollers, bearing means rotatably supporting said first rollers, two sets of leaf springs spaced apart transversely of said sleigh, said leaf springs extending rearwardly from said body and being connected to said bearing means, means connecting the foremost ends of said leaf springs to the rear end of said body, said leaf springs forming the sole supports for said bearing means, whereby vertical movements of said bearing means are opposed solely by the resiliency of said leaf springs, pivotal supports extending rearwardly from said body and supporting said second rollers,
  • a motor sleigh as claimed in claim 2 further comprising a shaft on which said first rollers are mounted,

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Toys (AREA)
US00276938A 1971-08-13 1972-08-01 Motor sleigh drive track arrangement Expired - Lifetime US3830323A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI226771 1971-08-13

Publications (1)

Publication Number Publication Date
US3830323A true US3830323A (en) 1974-08-20

Family

ID=8506873

Family Applications (1)

Application Number Title Priority Date Filing Date
US00276938A Expired - Lifetime US3830323A (en) 1971-08-13 1972-08-01 Motor sleigh drive track arrangement

Country Status (5)

Country Link
US (1) US3830323A (en:Method)
CA (1) CA954913A (en:Method)
CS (1) CS157604B2 (en:Method)
PL (1) PL75665B1 (en:Method)
SE (1) SE379515B (en:Method)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5791429A (en) * 1995-09-08 1998-08-11 Bergman; Ronald H. Snowmobile tunnel with bi-surfaced top
US7128176B1 (en) 2004-12-10 2006-10-31 Polaris Industries Inc. Staggered bogie wheel track suspension
WO2017056057A3 (en) * 2015-09-30 2017-12-14 Brp Finland Oy Snowmobile rear suspension
US10220895B2 (en) 2016-03-21 2019-03-05 Ariens Company Snow thrower track drive
US12397865B2 (en) 2019-01-31 2025-08-26 Bombardier Recreational Products Inc. Track assembly for a vehicle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3620318A (en) * 1970-04-02 1971-11-16 Frank T Gostomski Track tightener and rear idler suspension system
US3674103A (en) * 1970-05-21 1972-07-04 Elmer Carl Kiekhaefer Snow vehicle anti-sway suspension system
US3692132A (en) * 1970-04-27 1972-09-19 Velsa Oy Improved motor sledge
US3703936A (en) * 1970-09-24 1972-11-28 Herbert W Padwick Snowmobile suspension

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3620318A (en) * 1970-04-02 1971-11-16 Frank T Gostomski Track tightener and rear idler suspension system
US3692132A (en) * 1970-04-27 1972-09-19 Velsa Oy Improved motor sledge
US3674103A (en) * 1970-05-21 1972-07-04 Elmer Carl Kiekhaefer Snow vehicle anti-sway suspension system
US3703936A (en) * 1970-09-24 1972-11-28 Herbert W Padwick Snowmobile suspension

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5791429A (en) * 1995-09-08 1998-08-11 Bergman; Ronald H. Snowmobile tunnel with bi-surfaced top
US7128176B1 (en) 2004-12-10 2006-10-31 Polaris Industries Inc. Staggered bogie wheel track suspension
WO2017056057A3 (en) * 2015-09-30 2017-12-14 Brp Finland Oy Snowmobile rear suspension
US10814935B2 (en) 2015-09-30 2020-10-27 Bombardier Recreational Products Inc. Snowmobile rear suspension
US10220895B2 (en) 2016-03-21 2019-03-05 Ariens Company Snow thrower track drive
US10625797B2 (en) 2016-03-21 2020-04-21 Ariens Company Snow thrower track drive
US12397865B2 (en) 2019-01-31 2025-08-26 Bombardier Recreational Products Inc. Track assembly for a vehicle

Also Published As

Publication number Publication date
PL75665B1 (en:Method) 1974-12-31
CA954913A (en) 1974-09-17
SE379515B (en:Method) 1975-10-13
CS157604B2 (en:Method) 1974-09-16

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Legal Events

Date Code Title Description
AS Assignment

Owner name: VELSA OY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:OY POLAR-METAL PLAST AB, IN BANKRUPTCY;REEL/FRAME:004131/0145

Effective date: 19790604

Owner name: VELSA OY, STATELESS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:OY POLAR-METAL PLAST AB, IN BANKRUPTCY;REEL/FRAME:004131/0145

Effective date: 19790604