Abstract: A wheelchair with two large rear wheels, two swiveling front wheels and an open front has handgrips located vertically above the two rear wheels. A connecting rod pivoted to a handle attached to each of the handgrips extends downward to a plunger slidably located within a sleeve removably connected to the frame. An adjustable arm extends from the plunger through a slot in the sleeve to a position proximate yet not contacting each of the rear wheels. When a lever on the handle and each handgrip are squeezed the lever pivots and forces the rod and plunger downward within the sleeve. The arm on the plunger contacts each wheel and brakes the wheelchair.

Abstract: An offshore structure which is able to withstand the ice forces imposed thereon by impinging ice sheets and other larger masses of ice wherein the structure has an upper conical portion coaxially positioned relative to a lower conical portion. The walls forming both the upper and lower portions are inclined at an angle to the horizontal to receive ice masses moving into contact with the structure. The angle of inclination from the horizontal of the upper portion is greater than the angle of inclination of the lower portion, and the cross-sectional diameter of the upper conical portion is no greater than that at the top of the lower conical portion.

Abstract: An offshore structure which is able to withstand the ice forces imposed thereon by impinging ice sheets and other larger masses of ice wherein the structure has an upper conical portion coaxially positioned relative to a lower conical portion. The walls forming both the upper and lower portions are inclined at an angle to the horizontal to receive ice masses moving into contact with the structure. The angle of inclination from the horizontal of the upper portion is greater than the angle of inclination of the lower portion, and the cross-sectional diameter of the upper conical portion is less than that at the top of the lower conical portion so that there exists a step-like section between the upper conical portion and the lower conical portion.