US315136A - Easmus foesholm - Google Patents

Description

(No ModeL) R. PORSHOLM.

\ MOUNTING SCREW PROPELLERS- No. 315,136. Patented Apr. 7, 1885.

UNITED STATES PATENT OF ICE.

RASMUS FORSHOLM, OF NEW YORK, N. Y.

MOUNTING SCREW-PROPELLERS.

SEPECIPICATION forming part of Letters Patent No. 315,136, dated April '7, 1885.

(No model.)

To all whom it may concern.-

Be it known that I, 'RAsMUs FoRsHoLM, a citizen of Sweden, and a residentof New York,

' in the county and State of New York, have however, leaking from them into the boat.

The invention will be hereinafter described and claimed with reference to the accompanying drawings, in which- Figure 1 represents a longitudinal vertical central section of the aft part of a boat with my present improvement applied to it. Fig. 2 is a detail similar section on a larger scale than Fig. 1, showing the means of attaching the propeller-sleeve to the sternpost. Fig. 3 is a rear view of the stern-post, showing the face view of the bracket or plate by which the outer end of the propeller-sleeve is held, or as if seen in the direction of the arrow in Fig. 2.

A is the stern-post; B, the keel; C, the ordinary locker at the stern of the boat; and D, the stern-seat, upon which a person is generally seated in steering a boat. E is the first thwart in front of the stern-seat D. F is the rud- 7 der. G is the propeller. proper, and g the propeller-shaft. The horizontal propeller-shaft g is provided on its inner end with a small conical gear-wheel, H, which gears with a larger horizontally arranged conical gear wheel, I, mounted upon the lower end of an upright shaft, J, at 'the upper end of which latter is attached awinch or crank, j, or other suitable means by which to turn the shaft J with moderate velocity, and thereby to impart by means of the wheels I H a faster velocity to the propeller G. The parts as thus far described are old.

In order now to readily provide a boat with a screw-propeller and insure the easy working of the shafts without liability of leaking, as aforesaid, I have provided the following devices: A flat bar or plate, a, securable above the keel of the boat by bolts or screws b, is provided with a box or casing, c, for inclosing the gear-wheels I H, and with a cen tral stud or projection, 11, in which the inner ends of the shafts J and 9 have their bearings, as shown in'Fig. 1. The box or casing c is provided on top with a water-tight fitted cap or cover, 6. In rear of the casing c the plate a is provided with an upright lug, f,

"which may be arranged at a greateror less distance from the box c--for instance, as where indicated by dotted lines at f and the object of which is to insure the proper location of the propeller-shaft relative to the gearing with its shaft J. The shaft g and the upright shaft J, instead of having their bearings in stuffing-boxes (to prevent the entrance of water, but at the same time causing a great deal of friction to be overcome in the propulsion) are mounted in sleeves or tubes h 2', provided iuteriorly at their ends with bearings hc", for the respective shafts 9 J. The sleeves or tubes 13 h are secured water-tight in holes through the cover a, and the rear wall of the box 0, respectively, the said rear wall and aforesaid lug f being bored through at the same time, so as to be in axial line with each other and with the bearing, in d, of the inner end of the shaft 9. When the last-mentioned bearing is used, the inner bearing, h, may be dispensed with. For inserting the propeller in the boat it is only necessary to bore through the stern-post a hole of proper size to receive the aforesaidsleeve h, the outer end of which, projecting a little beyond the stern'post, is fitted water-tight in the latter. This is done by means of a plate, K, (see Figs. 2 and 3,) which is provided with a perforated boss, k, which surrounds the outer end of the sleeve h, a nipple or packing, L, of rubber or other suitable material, being inserted between the said boss and the tube hand clamped between the latter and the end surface of the stern by means of suitable screws, Z, by which the plate K is secured in place. The propeller may be arranged so as to project with its blades below the keel, as shown in the drawings, or to end flush with or a little above the lower surface of the keel. In either case, for the sake of convenience, I form upon the lower end of the plate K a horizontal lug, k, and attach to the latter the lower pintle, m, for the 5 rudder F, while the upper pintle, n, may be moving in a lug attached to the stern-post directly, or may be attached to the stern-post,

. and a lug on the rudder working upon it.

For the sake of strength, Iarrange underneath the keel a brace, M, and secure the rear end thereof to the lower end of the plate K, or its lug, and the forward end to the keel, as shown in the drawings. By this construction, it is evident that the ends of the tubes M I being packed water-tight, as aforesaid, no water can enter the boat through them, nor from the box 0 with the water-tight packed cover e, but the water has free access between the shafts and their bearings in the ends of the aforesaid sleeves or tubes, thus acting as alubricator for the journals and obviating the friction due to the use of st11ffingboxes..-I

It should be observed, however, that the upright sleeve or tube i should extend a little f above the water-line for the purpose of pre venting the water rising in the said tube around the upright shaft J from overflowing the said tube.

Y Having thus described my invention, I

0 claim as new and desire to secure by Letters Patent 1 The combination of the propeller-shafts 9 J and their connecting gearing with an inclosing continuous water-tight casing, h Gi, projecting with its upper inner end above the waterline, and packed around itslower outer end to the boat, substantially as set forth.

2. As a ready device for applying screwpropeller-shaft and protruding through the said stern, of an eXteriorly-attachable stern plate, K, having a perforated boss, k, surrounding the outer end of the said tube, and a packing, L, interposed between the said 1 boss and tube, substantially as set forth.

I In testimony that I claim the foregoing as I myinvention I have signed my name, in pres- 1 ence of two witnesses, this 22d day of April, 1884.

. RASMUS FORSHOLM.

R. W. NIATTHEWS,

i I Witnesses: i A. W. ALMQVIST.

propellers to boats, a fastening-plate, a, carboat and with a sleeve or tube, h, incasing the

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