US1485491A

US1485491A - Tap bolt and operating cap therefor

Info

Publication number: US1485491A
Application number: US591730A
Authority: US
Inventors: Robert Z Drake
Original assignee: Individual
Current assignee: Individual
Priority date: 1922-10-02
Filing date: 1922-10-02
Publication date: 1924-03-04
Anticipated expiration: 1941-03-04

Description

March 4 1924. 1,485,491

R. Z. DRAKE TAP BOLT A ND OPERATING CAP THEREFOR Filed Oct. 2, 1922 2 Sheets-Sheet 1 ma/wtoz 305m 2. 1m ke.

Patented Mar. 4,

nonnm: z. DRAKE, or mm, NEBRASKA.

TAP BOLT AND OPERATING CAP THEREFOR.

Application filed October 2, 1922. Serial No. 591,730.

To all whom it may concern:

Be it known that I, ROBERT Z. DRAKE, a citizen of the United States, residin at Omaha, in the county of Douglas and tate of Nebraska, have invented certain new and useful Improvements in a Tap Bolt and Operating Cap Therefor, of which the following is a specification.

This invention relates to a threaded bolt and a driver-cap therefor found to be particularly useful in bridge building, and useful specifically for securing planks to beams, girders or similar supports, and includes among other objects, the provision of a mounting of greaterfirmness and solidity than usual for the planks on said supports, so that vibration of parts will be practically eliminated, the particular means for.mounting the planks being attended with less ex- Jense and adapted to be more quickly and conveniently performed than ordinary. Another object is to provide such a construction that repair work may be conveniently done and that workmen may operate while above instead of below the girders or beams,

either when building or repairing a bridge.

The invent-ion also includes the provision of incising elements for the heads of the bolts, to facilitate countersinking in the planks, the shanks of the bolts having greater diameter than the threaded partsto ,facilitate operation when securing the planks to the beams on girders, and formed non-concentric with the threaded parts to cause a sidewise movement or crowding of the plank to form a complete roadway. lVhile useful in connection with bridge construction, the device, of course, may be em- .ployed for other purposes.

With the above objects in view and others to be mentioned, the invention presents a novel construction, combination and arrangement of parts as described herein and claimed, and as illustrated in the panying drawings, wherein,-

Fig. 1 is a plan view of a tap-bolt. Fig. 2 is a bottom plan view of the same. Fig. 3 is a side view of the tap-bolt. Fig. 4

is a plan view of a driver-cap for the tap bolt. F ig. 5 is a bottom plan view of the driver-cap. Fig. 6 isa side view of the driver-cap, a partof a tap-bolt also being shown partly in section. Fig. 7 illustrates a plank supported by and secured to a beam or girder by use of the tap-bolts. Fig. 8

' illustrates .a plurality of beams or-girders accomand a plank secured thereto by use of the tapbolts. a

Fig. 9 is a broken plan view showing planks secured to gir ers. Figs. 10 and 11 show modified forms for thebolts- Fig. 10 is a side view of a bolt having a threaded part concentric with and of lesser diameter than its shank. Fig. 11 illustrates a bolt having a shank non-concentric with its threaded p'art. Fig. 12 is a view, artly in section, showing a part of a gir er in side elevation with planks secured thereon by use of the threaded bolts. Fig. 13 shows a modified form for a bolt-head.

Referring now to the drawing, the invention, for convenience, is shown and described in connection with metallic beams or girders 10 which support the planks 11 of a' bridge, but the invention is adapted for use in connection with beams or girders constructed of wood or other suitable material. In order that the advantages above mentioned may be derived, I provide a. tapbolt 12,'its head a, being of disc-form and having peripheral recesses 6 opening, on its top and bottom, asecondary recess 0 being formed in one of the walls of each recess b to open on the bottom of the head a, and segmental recesses or depressions e being providedwhich also open on'the bottom of the head, each recess e opening on a recess 6 and having an inclined wall extending from a recess 1) to a recess a to form a cutting edge f extending diametri gallly from a recess 6 to the shank on the o V While in'the drawing, I have shown four recesses b together with four depressions e and four blades or edges 7' the particular number of the parts is not important, and they may be greater or less, dependin upon the kinds of plank employed and w ether the threads are fine or coarse, for the bolts. It will be appreciated that if the bolts have threaded connections with the; beams or girders or their flanges 13, suitable apertures 14 being formed'in the plank for replanks and also that the bolts may be removed, I'provide a driver-cap for the tap-bolts its upper sidebeing provided with an angular head 16 adapted to be' gripped by a wrench (not shown), the lower part of the cap being provided with lugs 17 corresponding in number to the recesses bof the disc-head a, each lug 17 being provided at its "free end with a pair 0 opposed, horizontal catches or projections d the spacing and proportions of the recesses b being suchthat the lugs ofthe cap will readily enter said recesses b when the cap is applied to the heads a for rotating the bolts.

In operation, a tap-bolt 12 being inserted in an aperture 14 to enter a threaded aperture of a girder or its flange 13, the cap is applied to the head, a, and by use of a wrench, the ,cap, together with the bolt, may be rotated. The parts are so proportioned that each lug 17 will engage afiside wall of a recess 1) when the cap is rotated for moving a bolt, and therefore the stresses directed to the head a will be sustained by i the lugs coincidently and uniformly, this being a feature relating to durability, since 'liability'to breakage of any of the lugs 17 will be reduced to a minimum. In practice,

the tap-bolt may be'rotated until its head a will become countersunk, the blades .or edges 7 operating to cut the fiber of the plank regardless of its density or hardened condition, to permit countersinking.

By referring to Fig. 2 it will be seen that each blade 7 extends radially to a re cess 0, each recess 0 having a side wall as shown in Figs. 2, 3 and 6 obviously operating as a blade since it terminates at the bottom of the bolts head the same, in this respect, ascthe termination-of a blade f, and while the side walls of recesses c are not disposed radially of the bolts head they are each disposed in the plane of a'blade f, and are adapted to cut into the wood when the bolt 'is rotated.

Itwill -be understood; of course," that chips'or shavings, cut by the blades, will move in lines of least,- resistance, and' since the depressions or recesses e areformed outwardly divergent and with their greater area at the periphery of a bolthead, the chips, during operation, will move outwardly toward the recesses b.

By use of the cap 15, the bolts maybe readily removed from the planks and from the "beams or girders, this being a matter of convenience in the work of removing planks when they require replacement. During the operation of rotating a, bolt, the cap will. not readily become detached from the head (1 since one of the projections d of each lug 17 may engage ina recess 0 or in a recess 6, this being a matter of importance durin operation, for otherwise the cap might lrecome detached from the bolt. Also the tap-bolts, in some instances may be inverted ormay be disposed in a horizontal or inclined position,

and the projections d for engaging in re- 'cesses c or e, as mentioned, permits opera:

tion regardless of the inclination of the tap-bolts.

Figs. 10, 11 and 12 illustrate modified forms for the bolts, considered to be within the scope of the invention, the bolt indicated at 18 I having its body or shank g, threaded part h and disc-head a formed concentric with its axis mw, the threaded part b, however, having a lesser diameter than the diameter of the shank, one of the advantages in the use of this bolt being i that, in instances vwhere the apertures in the plank have, comparatively, a greater diameter than ordinary, the upper part 9 of the bolt may fill the aperture 0 (Fig. 12) in a manner to prevent water from entering therein; also the threaded terminal of the bolt,'if of adequate length,- may be conv'eniently inserted in the aperture of the beam or girder in instances when the apergree of exactness, with the aperture of a beam or girder.

The bolt. indicated at 19 has a body or shank g disposed with its axis z-z nonconcentric with the axis 8-8 of its threaded part m and head a, the threaded part m having a lesser diameter than the body portion 9', the advantage in the use of said bolt being that it will operate to move the plank sidewise when rotated in the aperture it, its threadedpart being in engage- 'ment with the-beam or girder, the sidewise movement of the, plank operating to crowd or press it against the edge of a plank adjacent thereto, to form a more complete roadway in instances when the plank is in a buckled or, warped condition, or when the aperture k of the plank and aperture n of the beam. or girder do not align with exactness, when the plank is placed on the girder. 1

By use of-the invention, the planks will remain firmly connected with the beams or girders The heads of the bolts will not project above the surface of the roadway to cause injury. Also when the .planks become 'worn, the boltsmay be lowered,

ture of a plank does not register, in :a deister with exactness with the center line of the apertures k of the planks.

In the modified form of the invention shown in Fig. 13, the inclined depressions or recesses e are the same as already described, the cutting edges or the blades f, however, extending completely to the lower side of a.bolt-head a, a secondary recess 0' being provided in the wall of the recess 6 to permit engagement therein of a projection d of the cap 15, this modified form being considered clearly within the scope of the'invention since the function for the secondary recesses 0 and c are identical, and it is not important which side of the recesses b the secondary recesses c and c are located, the function to be discharged by these recesses being simply to operate as detaining elements, so that, during operation, the cap 15 will not become accidentally detached from the bolt-head. Also it will be noted that the upper, inclined walls of recesses e may discharge the-same function as recesses c or c.

.I claim as my invention,--

1. In devices for the purpose described, the combination with a bolt having a head provided with peripheral recesses, said headbeing provided on its inner side with secondary recesses each opening on a peripheral recess and with radially disposed blades each extending from the shank to terminate in a recess, the side wall of each secondary recess providing a second blade disposed in the plane of a first named blade, of a revoluble cap having lugs provided with projections, the combined widths of each lug and its projections being less than the width of a peripheral recess to permit said cap to be disposed with its lugs engaging in the peripheral recesses with one of its projections engaging in a secondary recess of said head.

2. In devices for the purpose described, the combination with a bolt having a threaded terminal and having a head circular in plan provided with peripheral recesses opening on its top and bottom, each recess having a terminal wall between said periphery and center of said head and one of the walls of each peripheral recess having a secondary recess opening thereon, of a rotatable cap having lugs provided with projections, said cap being adapted to be disposed with its bottom engaging the top of said head with its lugs engagmg in the peripheral recesses of saldhead, a projection of each lug engaging in a secondary recess thereof, the combined widths of each lug and its projections being less than the width of a peripheral recess.

3. In devices for the purpose described, the

wall of each secondary recess providing a second blade disposed in'the plane of a first named blade, of a rotatable cap having lugs projecting from its inner side, each lug'being provided with a projection, the combined widths of eachvlug and its projection being less than the width of a peripheral recess to permit the lugs -to be insertedin said peripheral recesses for engagement of the projections in said secondary recesses. 4. In devices for the purpose described, the combination with a bolt havin a head of disc-form provided in its perip cry with a recess and a second recess opening on the first named recess, of a revoluble cap having a head formed angular in plan and having anlug provided with a projection and adapted to be disposed with its lug engaging in the I 4 first named recess, the pro ection of said lug engaging in the second recess, the combined widths of the lug and its projection being less than the width of said first named recess. 5. In devices for the purpose described,a cap provided with a head angular in plan and having a lug provided with a projection and extending from its bottom, abolt having a threaded terminal and having head circular in plan provided in its inner 'sidewith radially disposed blades and having a recess opening on its top and bottom for receiving the lugof the cap and having a second recess opening on the first named recess for receiving the projection of said lug, the side wall of the second recess providing a blade disposed in the plane of the first named blades, the combined widths of said lug and its projection-being lessthan the width of said first named recess.

In testimony whereof, I have aflixed my 10 signature in presence of two witnesses.

- ROBERT Z; DRAKE. Witnesses:

HIRAM A. Srunens, ARTHUR H, Srunens.