US2757903A

US2757903A - Transmission post jack

Info

Publication number: US2757903A
Application number: US407659A
Authority: US
Inventors: Harry A Bill
Original assignee: Individual
Current assignee: Individual
Priority date: 1954-02-02
Filing date: 1954-02-02
Publication date: 1956-08-07
Anticipated expiration: 1973-08-07

Description

Aug. 7, 1956 H. A. BILL 2,757,903

TRANSMISSION POST JACK Filed Feb. 2, 1954 INVENTOR. JV M a". [M A United States Patent TRANSMISSION POST JACK Harry A. Bill, San Leandro, Calif.

Application February 2, 1954, Serial No. 407,659 2 Claims. (01. 254-40 This invention relates to improvements in means for lifting transmission poles, such as telegraph, telephone and electric light poles out of their ground sockets, and provides a pole cooperative hydraulic jack which through the medium of a flexible encircling member will lift a pole vertically to the point of tilting and continue lifting until the pole is elevated beyond the fall restricting point, and then will fall over with the pole with no resultant damage to the jack, the jack being supported on a base through a horizontal pivot to permit the upper end of the plunger to cooperate with the side surface of the pole.

The objects and advantages of theinvention are as follows:

First, to provide a jack having a ram with means at its upper end for engaging and holding a flexible element encircling a pole and with the ram cooperative with the pole side surface.

Second, to provide a hydraulic jack with a plunger having a diameter only slightly less than that of its piston for quick return of the plunger with minimum delivery of fluid.

Third, to provide a jack as outlined with a base for firm support on an earth surface and to provide a releasable hinge coupling between the bottom of the jack and the base to permit tilting movement of the jack during hoisting of a pole.

Fourth, to provide a jack as outlined in which the hinge coupling consists of a cylindrical member attached to the top of the base and an internally semi-cylindrical member on the cylinder to cooperate with said cylindrical member for elimination of any shearing stress on the connection between the cylinder and base.

Fifth, to provide a jack as outlined with pipe connections to the upper and lower ends of the cylinder and in which one of said connections includes a length of pipe extending from one connection to the other and parallel to and spaced from the cylinder wall, and with the two connections fixedly connected together to form a bail for carrying the jack.

In describing the invention reference will be had to the accompanying drawings, in which:

Fig. 1 is a side elevation of the invention partly shown in section and showing the combined upper and lower pipe connections and carrying bail.

Fig. 2 isa front elevation of the invention.

Fig. 3 is a top plan view.

Fig. 4 illustrates the purpose and operation of the invention.

The invention consists of a cylinder consisting of a section of metal tubing and having a bottom head 11 welded thereto as indicated at 12, and a top flange 13 which'rnay be fixed to the upper end of the cylinder by any suitable means such as welding indicated at 14.

The head 15 is bolted to this flange 13 as indicated at 16, and this head is provided with a suitable internal annular recess for the sealing means 17 whichmay be of any suitable type, and an axial bore 18 is provided in this head for the plunger 19 which may be formed integral or fixed to the piston 20, the plunger being only slightly smaller in diameter with a minimum of 82% of that of the piston for quick retraction of the plunger through a minimum of fluid under pressure.

The piston 20 is provided with suitable sealing means 21 and 22 for both directions of power travel. Stop means cooperative between the plunger or piston and the head is provided as indicated at 23, which shows an arcuate strip fixed to the plunger in spaced relation above the piston, for cooperation with the overhanging portion 24 of the head 15, this spacing being at least equal to the diameter of the piston, and preferably about one-and-onehalf times the diameter for a longer leverage between the head and the side wall of the cylinder when the plunger is advanced.

The head 15 is arcuately recessed in the front edge as indicated at 25 to engage about one side of a pole 26 this recess extending inwardly practically to the outer wall of the cylinder to provide as much depth as possible with consequent stability, when the jack is being operated.

A tie lug 27 projects upwardly from one side of the plunger 19 with the front edge 28 coincident with the periphery of the plunger and may be formed integral with the upper end of the plunger or may be fixed thereon as by welding indicated at 29, and this tie lug has a slot formed downwardly from the top to receive the links of a chain or ends of a cable 30 encompassing the pole 26 to be pulled. If preferred, the chain or cable may be releasably connected about the pole and then slipped over this lug, either way being satisfactory.

The hinge between the base 31 and bottom 11 of the cyinder consists of a bar 32 of round stock extending the width of the bottom and fixed to the bottom as by welding indicated at 33. Fixed to the bottom of the cylinder as indicated by Welding is substantially a half tube 34, the cylindrical bar and the concave member providing a hinge which cannot shear, and thus being able to sustain any load to which the jack is subjected, While permitting ample swinging movement of the jack and permitting the jack to be lifted off the base without requiring any disconnections to be made.

A leveling block 35 is fixed to the forward portion of the base and has a height equal to the height of the hinge, and has a handhold opening 36 formed therethrough for convenience in carrying the base.

The cylinder is provided with a connection for each end for the source of fluid under pressure, as indicated at 37 and 38, one of these connections as 37 being formed at right angles with a length of the connection formed in spaced relation to and parallel to the cylinder as indicated at 39, the other end being again turned outwardly at a right angle and being fixed to the other connection as indicated at 40 thus coincidently forming a bail 41 for convenience in carrying the jack. Thus provision for convenient carrying of both the jack and the base is provided.

As will be seen by Fig. 4, it is merely necessary to pass a flexible element about the pole and in or over the ing and then operate the jack to lift the pole out of the earth. The extra heavy plunger and limited piston movement assures a very rigid and strong jack free of any tendency to buckle or twist, and the small return piston area assures rapid lowering of the plunger with a minimum of fluid transfer to the upper end.

I claim:

1. A pole removing jack comprising a cylinder having a head and a bottom, a piston operating in said cylinder and having a plunger having a diameter only slightly less than, and not less than 82% of, that of the piston for extreme rigidity, and with the limited piston area on the plunger side providing for rapid retraction of the plunger with a minimum of fluid transfer to that side, a tie lug projecting upwardly from the top at one side of said plunger with the front edge coincident with the periphery of the plunger for close association with a pole to be pulled, and comprising coupling means for a chain for encircling attachment of the chain to the pole, said tie lug having a slot formed from the top for coupling engagement and securing of the chain, said head projecting annularly about the upper end of the cylinder and having an arcuate recess formed inwardly toward the axis of the piston and in said one side for engagement about the periphery of the pole and for substantial contact of said tie lug with the surface of the pole for efficient and nonslipping operation of the jack on the pole, an arcuate bearing invertedly fixed to said bottom with its axis transverse to that of the cylinder and in perpendicular alignment with said lug, a base having a cylindrical member fixed thereon throughout its length for cooperation with said bearing for limited angular movement of the cylinder as a pole is being lifted, and a stop on the said base for cooperation with said bottom in spaced relation to said bearing and having a height equal to the combined height through the bearing wall and cylindrical member for supporting said bottom parallel to said base, with the cylinder directly removable from said base at will.

2. A pole removing jack comprising a cylinder having a head and a bottom, a piston in said cylinder and having a plunger having a diameter only slightly less than the inside diameter of said cylinder and having a chain attaching lug projecting upwardly from one side with the outer surface coincident with the periphery of the plunger,

said head projecting annularly from the outer surface of said cylinder and having an arcuate recess formed in Wardly from said one side toward the axis of the plunger for locating cooperation with the pole for maintaining the position of the jack and for contacting cooperation of the chain attaching lug with the surface of the pole for eflicient and accurate operation in lifting, a base having a shaft peripherally fixed on one side to said base adjacent one end, and a stop projecting upwardly from the other end, a half bearing invertedly fixed to the underside of said bottom for rocking support of said cylinder on said base and being axially located substantially in perpendicular alignment with said chain attaching lug, with said stop and the combined thickness through the wall of the half bearing and shaft being substantially equal for parallelism between said bottom and said base for conventional lifting of elements other than poles, with the cylinder being free for removal from the base at will, a fluid connection from each, the upper and lower ends of said cylinder and including each a pipe, with the upper connection pipe depending parallel with the cylinder and having fixed connection with the lower connection pipe to form a bail for carrying the jack independently of said base.

References Cited in the file of this patent UNITED STATES PATENTS 1,325,963 Templeton Dec. 23, 1919 2,052,781 Lindsay Sept. 1, 1936 2,352,390 Kirkland June 27, 1944