Патент USA US2096331код для вставки
Oct. 19, 1937. - D. LIVINGSTONE 2,096,331 COFFERDAM Filed July 25, 1936 2 Sheets-Sheet 1 œ ß Z , M, 0. „. . ETTÉDY': „Maéüî' Oct.V `19, 1937. D. LIVINGSTONE Filed July 25, 1936 È à 2,096,331 2 Sheets-Sheet 2 M www WßW/ß Patented oct. 19, 1937 2,096,331 UNITED STATES PATENT OFFICE 2,096,331 COFFERDAM Daniel Livingstone, Nantasket, Mass. Application July 25, 1936, Serial No. 92,579 ' 1~ Claim. My invention relates to a coiïerdam structure for use in excavating >holes for poles, posts and the like and it has for its object to provide an lefficient and inexpensiveV portable coiferdam 5 structureA through the use of which the operation In the accompanying drawings: serted therein after which the excavating is continued within the coiferdam and as the earth is removed the coiferdam follows, or is caused to follow, the bottom of the hole downwardly, the more or less pointed lower ends of the sections I0 permitting the latter to be forced downwardly into quicksand or soft ground as the material at the lower end of the cofferdam is removed from the latter. During the progress of the work the indentures I 5 also give access to the earth along side of the lower end of the coiïerdam. When the hole is of the desired depth the pole I 6 is placed within the coiîerdam as shown in Fig. 4, with a suitable tackle, not shown, attached to its upper portion. The rope of this tackle is then threaded through and tied or otherwise fastened Figure 1 is a side elevation of a coiferdam struc to one or both of the eyes I3 after which the ture constructed in accordance with this inven tackle is operated to pull the cofferdam upwardly n of planting or erecting poles, posts and the like is facilitated, particularly in situations wherev there is quicksand or where the ground is loose or sandy. ' y y To these ends I have provided a portable coffer dam unit having the peculiar features of con struction and'mode of use set forth in the follow ing description, the several novel features of the invention being separately pointed out and de 15 fined in the claim at' the close thereof. 10 tion. 20 Figure 2 lis an elevation of another side of the „structure shown in Fig. 1. Figure 3 is a section on line 3-3 of Fig. 1. Figure 4 illustrates the manner in which my new cofferdam structure is used. 25 ` The illustrated embodiment of my invention is an elongate tubular metallic unit which may measure, for example,»eighteen inches in diam eter and three feet in length when designed for use in connection with the erection of poles for 30> supporting electric light and power conductors. As herein shown this unit consists of two im perforate semicylindrical metallic sections I0 out of the hole. When the coiïerdam is above the ground one 1 of the pintles I I is removed thus freeing the two sections ID so that they can _be swung away from each other on the remaining pintle as a pivot or hinge, thus opening the cofferdam so that it can be removed from the pole for use at another lo 25 cation. ' Each pintle I I is made at its upper end with a head IIa in the form of an eye for engagement with a hook or other tool by means of which it is conveniently removed as described. 30 What I claim is: ’ each of which is interiorly and exteriorly smooth A portable cofferdam structure comprising a pair of metallic sections each made with an im and longitudinally level throughout except that perforate semicylindrical body portion provided 35 a small bead or flange may beprovided upon the outside and at the top thereof, as shown. 'I'hese sections are separably fastened together at their opposite sides to form an imperforate tubu lar cofferdam unit or Vmember by two removable pintles II which extend loosely through inter meshed apertured' lugs I2 provided at opposite sides of the sections. , Each .semicylindrical section l0 is provided at its rupper end-midway between its opposite 45 sides-_with an aperturedlug I3, while its lower along its opposite sides with a row of longitudi nally apertured lugs alternating and intermesh ing with the lugs of the other section so as t0 provide an elongate and imperforate cylindrical tubular member whose interior and exterior sur faces are longitudinally smooth and level from a 40 point closely adjacent to their upper ends to their lower extremities, said sections being pointedly tapered at their lower ends and each made at its upper end with an upstanding apertured lug for , engagement with the rope of an overhead hoist 45 end is cut away or rounded as at I4 so that when ing tackle, and a pair of pintles, one removably the two sections are secured together by the pintles II the lower end of the tubular structure mounted within the intermeshing apertured lugs y thus formed isprovided with two oppositely dis 50 posed indentures I5 as will be clear from Figs. at one side of said member and the other remov ably mounted within the intermeshing apertured lugs at the opposite side of said member, each 50 Zand 4. f of said pintles being made at its upper end with The above described cofferdam structure is for an eye disposed above the upper end of said mem use in digging holes for poles, posts and the like, ' ber by means of which said pintle is removed to in locations where the land is boggy, sandy or disconnect said sections. 55 loose,'or where there is quicksand. In making a 55 hole the latter is started and the cofferdam in DANIEL LIVINGSTONE.