US754996A - Motor-sled. - Google Patents

Description

Nol 754,996. PATBNTED MAR. 22, 1904.

T. HALLDORSUN.

MOTOR SLED.

APPLIA-TION FILED JUNE 10, 190,3.

N0 MODEL. 2 SHEETS-SHEET 1.

y @uji/Ween@ Q7' "ff,

we nonms Pneus co., wommmpv. msamcnou. b. c.

No MODEL.4

PATENTEDMAR. 22, 1904.

T. HALLDoRsoN.

' MOTOR SLED.

APPLIOATION FILED JUNE 1o, 1903.

2 SHEETS-SHEET 2.-

Patented March 22, 1904.

PATENT OFFICE.

THORGILS HALLDORSON, OF MOUNTAIN, NORTH DAKOTA.

MOTOR-SLED.

SPECIFICATION forming part 0f Letters Pate-111' N0. 754,996, dated March 2.2, 1904.

Application filed June 10, 1903. i Serial No. 160,790. (No model.)

To all whom it may concern:

Be it known that I, THORGILs HALLDoRsoN, a citizen of the United States, residing' at Mountain, in the county of Pembina, State of North Dakota, have invented certain new and useful Improvements in Motor-Sleds; and I doliereby declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to motor-sleds; and it has for its object to provide a construction wherein by rotation of a crank-shaft certain mechanism will be operated t0 propel the sled with a minimum expenditure ofy energy.

A further object of the invention is to provide a construction wherein the propelling mechanism may be raised from operative position when it is desired to draw the sled along.

Other objects and advantages of the invention have reference to details of mechanism and will be understood from the followingdescription.

In the drawings forming a portion of this specification, and in which like numerals of reference indicate similar parts in the several views, Figure 1 is a side elevation of a sled embodying the present invention and provided with a crank mechanism from which the propelling apparatus is driven. Fig. 2 is a section taken vertically and longitudinally through the central portion of the sled. Fig. 3 is a top plan view of the sled with the platform and the mechanism thereon removed, the top rail at one side of the sledframe being broken away to show more clearly the underlying mechanism. Fig. 4 is a vertical section taken transversely through one side of the sled in advance of the guide-pulleys and showing the latter in elevation.

Referring now to the drawings, the present sled comprises runners 5, having shoes 6, the front ends of which are curved upwardly in the usual manner and are connected by the transverse brace bar 7, which passes also through the upwardly-turnedends of the top rails 8 of the sled-frame. Uprights 9 support the rear ends of the rails from the runners,

the lower ends of the uprights being turned laterally and bolted upon the runners, while the upper ends are provided with eyes through which is engaged the transverse brace-bar 10, which is engaged also through the rails 8. Nuts 11 upon the brace- bars 7 and 10 are adjusted to impinge against the inner and outer faces of the rails and hold the latter from sliding on the braces.

To propel the sled, there is employed a mechanism, including a crank-shaft 12, having four cranks 13, 14, 15, and 16, which is propelled through the medium of a sprocketwheel 17, with which is engaged a chain 18, engaged also with the sprocket-wheel 19 on a driving-shaft 20, mounted in suitable bearings upon the platform 21 of the sled, and which latter shaft may be rotated by hand or in any other suitable manner.

Connected with each of the cranks of the shaft 12 is a propelling member, which may be termed a leg. Each leg consists of a bar 18, having a bearing at its forward end, which engages the corresponding crank of the shaft 12, the bar including a forward member and a rear member 19', which extends at an obtuse angle to the forward member. The member 19 forms the lower side of a guide-frame, the upper side of which is formed by the rod 20', which is attached at its forward end to the front member of the leg 18 and which portion 20 lies directly above and parallel with the portion 19 excepting at its rear end, which is bent downwardly and secured rigidly to the member 19.

At the rear end of the forward member of the leg 18 is a foot consisting of ametal plate 21', the front of which is bent downwardly at right angles, as shown at 22, to form a calk, while the rear end 23 is bent downwardlyiri curved shape to form a second calk, the positions of these calks being such that the foot may be drawn readily in one direction over the surface on which the sled is to be-.propelled, while movement of the foot in the opposite direction will serve to sink the calks into said surface. An additional calk 24 is provided and depends from the foot between the calks 22 and 23. To connect the foot with the leg 18, a plate 25 is secured upon the foot and is provided. with ears 26, which receive the legs between them, and through the ears and the leg is passed a pivot-bolt 27, so that in the forward movement of the leg the foot may bedragged freely, while in the rearward movement of the leg, which eects propulsion of the sled, the foot may adjust itself to any unevenness of the surface.

Upon each of the runners in advance of the upright 9 is an ear 28, to which is pivoted the forward end of a lever 29, which is slotted longitudinally and through the slot of which passes the upright or rear support 9, this upright preventing lateral displacement of the rear end of the lever. Through the slot of the lever `passes also a brace-rod 30, which is connected at its lower end to the sled-runner and at its upper end has an eye 3l, through which is engaged the brace 7. Upon the rod 30 at each side of the sled is disposed a helical spring 32, which rests with its up )er end against the loop of the eye 31 and with its lower end against the lever 29 and holds the latter yieldably against upward movement.

`Disposed transversely upon the slotted lever is a hanger 33 in the form of a metal plate, having its ends at the sides of the lever bent downwardly and then upwardly to form the U-shaped frames 34, in which are journaled the guide-rollers 35. The guide-frame of each of the legsl8 is disposed with its lower member 19' between a roller 35 and the bottom of its U-shaped frame, while the upper side 20 of the guide-frame rests upon the roller 35. The hanger 33 at each side of the sled is held to the corresponding slotted lever by means of a bolt 36, which passes through the slot of the lever and through the hanger and a clamping-plate 37 at the opposite sideof the slotted lever from the hanger. This arrangement permits of adjustment of the hanger longitudinally of the slotted lever to suit different conditions.

It will be understood that, as illustrated, l

each of the hangers has two guide-rollers 35, with which are engaged the guide-frames of a pair of propelling-legs located one at each side of the runner at that side of the sled.

The crank-shaft l2 is rotated so that the cranks pass through the lower arc of their rotation in the rearward movement of the propelling-legs and through the upper arcs during the forward movement of the propellinglegs. Thus the feet are held down in engaging position during the rearward movements and are raised during the forward movements, so that the front ends of the feet adjacent to which the feet are pivoted are raised, the rear ends of the feet dragging loosely. During the movement of each leg it of course has a shifting pivot formed at the point of contact of the guide pulley or wheel 35 and the guideframe of the leg, and as the shaft l2 continues to rotate thelegs and therewith the feet are operated to propel the sled.

When .it is desired to draw the sled, the propelling-feet must be raised out of active position, and for this purpose levers 40 are pivoted to the sides 8 of the sled-frame and are connected by means of chains 42 to the ends of the levers 29. Rack-bars 43 are disposed for engagement by the levers 40 to hold the latter at different elevations. y

To increase the tensions of the springs 32, so that the feet will be pressed more firmly against the earth when in action, levers 44 are pivoted to the forward portions of the sides.

of the sled, and through these levers arefpassed the rods 30, the levers 44 bearing against the i the levers 44 to hold the latter against upward;

movement.

What is claimed is"- l. The combination with a sled, of a crankshaft having cranks disposed one at each side of each runner of the sled, a lever pivoted upon each runner, a pair of guide-rollers supported by each of the levers, propelling-legs having guide frames engaged each with a guide-roller, each of the legs being connected to a crank of the ycrank-shaft, and means for holding each of the levers yieldably with the connected propelling-legs in active positions.

2. The combination with a sled, of a crankshaft having cranks disposed one at each side of each runner of the sled, a lever pivoted upon each runner, a pair of guide-rollers supported by each lever, propelling-legs having guide-frames engaged each with a roller, each ofthe legs being connected to a crank-shaft,

and adjustable means for holding each of the levers yieldably with the connected propelling-legs in active positions.

3l The combination with a sled, of a crankshaft, a lever pivoted at each side of the sled, guide-pulleys supported from each lever and adjustable longitudinally thereof, a plurality of propelling-legs each having a guide-frame engaged with a guide-pulley and having its forward end connected with a crank-shaft, feet pivoted adjacent to their forward ends to the legs respectively, springs disposed to hold the levers yieldably in lowered positions, pivoted levers engaged with the springs for adjusting the tensions thereof, means for holding the tension-levers at different points of their adjustments, and lifting-levers connected with the first-named levers and adapted to lift and hold them in raised positions.

4. The combination with a sled, of a crankshaft, a lever pivoted at each side of the sled, guide-pulleys supported from each lever and IOO ITO

adjustable longitudinally thereof, a plurality of propelling-legs each having a guide-frame engaged with a guide-pulley and having its forward end connected with a crank of the crank-shaft, i'ee't pivoted adjacent to their forward ends to the legs respectively, springs disposed to hold the levers yeldably in lowered positions, and lifting-levers connected

Images