US1533751A - Lifting device for temper screws - Google Patents

Description

April 14,1925' G A MoN-GOMERY 1,533,751

LIFTING DEVICE FOR\ TEMPER SCREWS Filed April 29. 1924 e 13 e Q e fz!! Jig-1. fj//ffxz if@ j j, J4 .Z3 Zzgl M//l -L- -l,;"| f 50131/ 117, j i ./7| l 1,l Illl 579| fz l f r y' n 'u W ,f 'f J' 1 I 7g I 'K l' li ,l "l lli Il I 4 Y" Ffa 1y /5 di 1i 7i M f IHIIIIIIIIIIMIII iluiiltlvmmnl f VZ? :"X 76 l 5f j 75 73 'V751 #vz 17 15 j Fi/'94 .i

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l by y L Patented Apr. 14, 1925i.

PATENT OFFICE.

I GUSTAVUS A. MONTGOMERY, 0F TI'IUSVILLE, JEENNSYLVANIA.

LIFTING DEVICE FOR TEMPER SCREWS. l

Application filed. April 29, 1924. Serial No. 709,931.

To all whom t may concern:

Be it known that I, GUsTAvUs A. MONT- GOMERY, a citizen of Finland, residing at Titusville, in the county of Crawford and State of Pennsylvania, have invented new andI useful Improvements in Lifting Devices forV Temper Screws, of which th following is a` specification. i

This invention relates generally to the temper screws employed in connection with welldrilling apparatus, but more particularly to the lifting mechanism employed therewith. i y

One of its objects is to provide an iinproved lifting or counterbalancing mechanism for temper screws which is eflicient, reliable and automatic in operation.

Other objects of the invention are to. provide a device of this character which is l simple, strong and durablel in construction, and which is readily applicable to the temper screws now in use without materially altering` their construction.

In' the accompanying drawings:

Figure 1 is a longitudinal sectional view of the device, taken in the plane of line l-1, Fig. 2. Figure 2 is a horizontal section on line 2 2, Fig. 1. Figures 3 and .4; are transverse vertical sections taken on the correspondinglynumbered lines in Fig. 1.

Similar characters of reference'indicate corresponding parts throughout the several views.

Referring now to the drawings, the numeral 10 indicates the temper screw which may be of any well-known construction, being provided at its upper end with the customary cross bar 11 seated in the saddleplates 12 secured to the front end of the walking beam 13 of the drilling apparatus. The stem 14 of the temper screw has a vcrtical bore 15 through which the suspension cable16 passes, the latter being fastened at its lower end to an eye 17 or other appropriate coupling attached to the upper end of the temper screw.

The improved lifting mechanism is preferablymounted on the walking beam near the front end thereofand consistsof a longitudinally divided casing or housing of two sections 18, 19jointed by bolts 20 and se-4 curely fastened toy said walking beam by bolts 21 or other suitable fastenings. This casing is closed on all sides with the .excepand meshes with a gear 26 secured to a re-v wind shaft 27. parallel to said drum-shaft and `iournaled in the rear portion of the casing.

Means are provided for. automatically impart-ing motion to the rewind shaft 27 and rotating the sheave 24- in the proper direction to elevate the temper screw whenever the vcustomary screw-operating mechanism (not shown) is disengagedtherefrom. For

this purpose, the rewind shaft has a pinion 28 thereon which engages ,a horizontally.;

disposed gear-rack 29 movable lengthwise of the casing and the walkingy beam. This gear-rachis guided in an opening 30 formed in an extension 31 of the casing-section 18. and is adapted to project intoa cylindrical portion 32 disposed in rear of and longitudinally inline with said extension. Aft its rear end the gear-rack` is provided with a rod 33 having a washer 34.- anda nut 35 at its free end, and interposed between said washer and an inturned iiange 36 located at the intersection of the extension 31 with its `cylindrical portion 32 is a coiled spring 37 which tends constantly to move said gear-rack rearwardly for rotating the sheave 24 in a counter-clockwise direction to elevate the temper screw. A screw-plug 38 is applied to the vopen rear end of said cylindrical portion against which the washer 34: is adapted to abut for limiting the rearward movement of the. rack.

Briefly stated, the operation of the dcvice is as follows, assuming theparts to be in their normal position, as shownfby full lines in the drawings, wherein the temper r screw 10 is in its elevated position and the gear-rack 29 in its extreme rearward posi-- tion. lVhen loweringv the temper screw by means of the usual screw-operating mechanism, the sheave 24 is rotated in a cloclwise direct-ion andthrough the medium of the reduction gearing 25, 26 and 28 the rack is moved forwardly in the direction of the arrow, Fig. l, compressing the spring 3T. lVhen the screw reaches its extreme lower position and its operating mechanismis re'- leased, thespring causes the automatic return of the` screw to its initial position.

This improved screw-elevating device is simple and compact in construction, it can be readily employed in connection with eX- is'ting temper screws by simply drilling the cable-passages l5 in the stems thereof, and its parts are so organizediand arranged that they `are not liable to get out of order. Furthermore, all parts of the device are enclosed and out. of the way where `they do not interfere with `those working around the drilling apparatus.

I claim as my invention:

1. The combination with the walking beam of a drilling apparatus and the temper screw supported thereby, of an elevating device for the temper screw, comprising a casing mounted on the walking beam, a winding drum carried by said casing, a flexible member connected at one end to Asaid temper screw and at its other end to said drum, and 'means in said casing operatively connected` to said drum and tending constantly to rotate the latter in a direction to 'elevate the temper screw.

2. The combination with the walking ybeam of a drilling apparatus and the 'temper screw supported thereby, :of an elevating vdevice for the temper screw, comprising a casing mounted on the `walking beam, a i

'winding drum carried by said casing, a flexible member connected Iat one end to 1said 'temper screw and lat its other end to said drum, 'and a yieldable member in said casing'opera-tively connected to said drum -for resisting rotation of the latter in a di,- rection to lower the temper screw. V '3. 'The combination with the walking 'beam of a drilling apparatus and the temper l,screw supported thereby, of an elevating device for the temper screw, comprising a 'casing yn`1oiintedon-the walking beam, a winding* drum carried by said casing, 'a `flexible member connected at one end to said temper screw `and at its other end to 'said drum, 'a 'yielda'ble member guided in said casing 'for movement lengthwise thereof, 'and driving mechanism interposed between said drum and'said yieldable member, the latter resisting rotation of the drum^in a direction to flower the 'temper screw.

4. yThe combination with the -walking ibeamfof fa drilling apparatus 'and the temper screw supported thereby, of an elevating device for the temper screw, comprising a casing rmounted on the walking beam, a winding drum carried by said casing, a flexible member connected at one end to said temper :screw and at its other'v end to said drum` a gear rack guided in said casing for movement lengthwise thereof, gearing interposed between said drun'ifa'ndsaid gear rack, and means tending to urge said rack in a direction to elevate the temper screw.

5. The combination with the walking beam of a drilling apparatus and the temper screw supported thereby, of lan elevating device for the temper screw, comprising a casing' mounted on the walking beam, a winding` drum carried by said casing, 'a flexible member connected at one end to said temper screw and at its other end to said drum, a gear rack guided in said casing for movement lengthwise thereof, reduction gearing interposed between said drum and said gear rack` anda coil spring applied to sai-d rack for moving the same in a direction to elevate the temper screw.

6. The combination with the walking beam of a drilling apparatus and the temper screw supported thereby, of an elevating device for the temper screw, comprising a casing mounted on the walking beamk and having an extension at one side thereof, a winding drum mounted in said casing and having a cable wound -thereon connected at its free end to the temper screw, a gear rack guided in said casing-extension for movement lengthwise thereof, reduction `gearing in the casing and interposed between sai-d drum and said gear rack, and a coil spring` applied to said rack for moving the same in a direction to elevate the temper screw.

7. An automatic lifting device for temper screws` comprising a casing. a winding drum journaled in said casing and, adapted for connection with the temper screw, a springpressed gear rack operatively connected with said drum and tending constantly to rotate it in a direction to .lift the temper screw, and gearing between said drum and said rack.

8. An automatic lifting device for temper screws, comprising a casing, parallel shafts journaled in said casing, a winding drum mounted on one of said shafts and including a cable adapted for connection with the tem- `.per screw, a pinion on said drum-shaft, a gear and pinion mounted on `the other shaft,

`said gear meshing' with said drumshaft pinion, a gear rack guided 'on said casing and meshing with the pinion of said secondname'd shaft, and means engaging said rack and tending constantly to move it in a direction to 'lift the temperscrew y.

` 9. Anautomatic lifting device for temper screws, comprising a casing constructed of jointed sections, one of the sections Carrying im extension, parallel shafts journaled in said Casing, a Winding drum mounted on one of said shafts and including a cable adapte-d for connection with the temper screw, a

)inion on Said drum-shaft a O'ear and inion mounted on the other shaft, said gear meshing with said drum-shaft pinion, a gear rack guided in Said section-extension and meshing with the pinion of said second-named 10 shaft, and u coil spring Contained in said extension and applied to saidgear reel; for constantly urgiiigthe latter in a direction to lift the temper screw.

GUSTAVUS A. MONTGOMERY.

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