US1076569A - Plumb-bob. - Google Patents

Description

J. GAMBLLEE.

PLUMB BOB.

APPLIOATION FILED MAY 26, 1013.

Patented Oct. 21, 1913.

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EXQE.

JEULEOS GAMBLLEE, OF TENAFLY, NEXV JERSEY.

PLUMB-BOB.

Specification of Letters Patent.

Application filed. May 26, 1913.

Patented @ct. 21, 1913.-

Serial No. 769,862.

To all whom it may concern Be it known that I, Jn'ULEos GAMBLLEE, a citizen of ti e United States, and a resident of Tenafiy, in the county of Bergen and tltate of New Jersey, have invented a new and improved Plumb-Bob, of which the following is a full, clear, and exact description.

This invention relates to mechanics implements, and has particular reference to the novel construction of plumb bobs.

Among the objects of the invention is to provide a plumb bob, the body of which is adapted to house the cord by which the bob is suspended whilein use.

Another object of the invention is toimprove the construction whereby in a simple and reliable manner the drum or spindle on which the cord is wound when housed within the device may be manipulated either to withdraw the cord, to return the cord into the bob, or to lock it at any desired length.

The foregoing and other objects of the invention will hereinafter be more fully de scribed and claimed and illustrated in the drawings forming a part of this specification in which like characters of reference indicate corresponding parts in all the views, and in which Figure 1 is a vertical sectional view indicating the construction of this device in a preferred embodiment; Fig. 2 is a transverse section on the line 2-2 of Fig. 1; and Fig. 3 is a side view, looking toward the right in Fig. 1, of certain parts removed from the interior of the shell of the device.

The seve'al parts of this device may be made of any suitable materials, and the relative sizes and proportions of the same may be varied to a considerable extent without departing from the spirit of the invention hereinafter more fully set forth and specifically claimed.

In Fig. 1 I show a plumb bob of well known configuration and including a point 10 having an upwardly projecting internally threaded flange 11 and a collar 12 having a downwardly projecting externally threaded flange 13 upon which the point flange 11 is adapted to lit. The collar 12 has an upwardly projecting neck 14.

Vithin the interior of the bob or the easing composed of the flanged portions of the point and collar is a shell 15 of substantially tubular or hollow cylindrical formation, the axis of which is coincident with the vertical axis of the plumb bob. The lower end of the shell 15 is fitted substantially snugly within the flange 13 of the collar and is prevented from rotation therein by means of studs 16 projecting outwardly beyond said shell and entering notches 17 formed in the lower edge of the flange 13. A drum or shaft 18 is journaled transversely in said shell 15 at substantially its center, and the lower or inner end of the plumb bob cord. 19 is fixed to said shaft. The upper portion of the. shell 15 is of less diameter than the lower portion, and a pinion 20 is fixed to said shaft on the outer side of theportion of the shell or between the shell and the flange 18 of the bob collar. A yoke 21 formed of flat sheet metal and formed into a substantially U-shaped structure is introduced into the interior of the shell, as shown in Figs. 1 and 2, and the shaft- 18 is passed therethrough, maintaining the yoke in the position indicated. The purpose of this yoke, among others, is to guard the cord 19 and prevent it from becoming entangled in the bearings in the shell.

As a suitable means to control the opera tion of the shaft 18 and therefore the length or position of the cord, 1 provide a crown gear 22 fitted loosely upon the upper end of the shell and having teeth 23 meshing with the teeth of the pinion 20. A hollow shank 24 extends upwardly from the crown gear with its aXis coincident with the axis of the interior device and having a central bore 25 through which the cord 19 extends outwardly, terminating in a ring or hanger 26. When the crown gear is free to rotate, a pull upon the hanger 26 will draw the cord out of the bob, unwinding the same from the shaft 18. During such operation of the cord, thecrown gear will be rotated by the pinion 20. I provide a lock nut 27 adj ustably mounted upon the threaded portion 24 of the shank and adapted to impinge against the upper portion of the neck 14. This action of the lock nut locks the crown gear from rotation and hence prevents the rotation of the pinion and shaft. It will follow, therefore. that when the cord is drawn out as far as desired, a slight turn of the lock nut will lock the operating parts of the device and will maintain the cord at the length indicated. l/Vhen it is desired, however, to return the cord within the casing, the lock nut 27 is loosened by a slight reverse movement, and then by rotating the crown gear as by operation upon the finger piece 28, the crown gear through its engagement with the pinion will wind up the string within the casing. The gear 22 being so much larger than the pinion 20, a comparatively few rotations of the finger piece and shank 24lto which it is connected will suffice to wind up the maximum amount of cord. The finger piece 28 is preferably keyed to the upper end of the shank by means of a set screw 29 for convenience of assembling or disassembling.

Having thus described my invention, 1

1 claim as new and desire to secure by Letters Pa tent r l. In a plumb bob, the combination of a twopart casing, a shell within the casing, ashaft journaled in the shell, a cord connected at one end to the shaft and wound thereupon, and means to control the winding and unwinding actions of the cord with respect to the shaft, said controlling means comprising a crown gear, a pinion in mesh with the gear, and means extending upwardly from the crown gear to control the rotation thereof from the outside.

2. In a plumb bob, the combination of a hollow casing, a shell within the casing, a shaft journaled transversely of and in the shell, a pinion connected to the shaft, a gear embracing the upper end of the shell and meshing with said pinion, a shank having a central bore extending upwardly from the said gear to the outside of the casing, a cord connected at its inner end to the shaft and a crown gear rotatably fitted upon the upper" end of the shell and meshing with said pinion, a cord. connected at one end to the shaft 7 and maintained in position thereon by said yoke, a screw threaded shank extending up wardly and axially from said crown gear and having a central bore through which said cordis extendechnieans at the upper end of the shank to rotate the same in one direction to wind up the cord, and means I adjustable along the threaded portion of the shank and adapted to cooperate with the shell to prevent the rotation of the shank and crown 'ear substantiall as set forth.

In testimony whereof I have signed my name to this specification 1n the'presence of two subscriblng Witnesses.

JEULEO S GAlvlBLLEEJ \Vitnesses G120. L. BEELER, PHILIP D. RoLLHAUs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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