US2182935A

US2182935A - Rotary machine bushing arrangement

Info

Publication number: US2182935A
Application number: US289225A
Authority: US
Inventors: Whann Rural Welton
Original assignee: Emsco Derrick and Equipment Co
Current assignee: Emsco Derrick and Equipment Co
Priority date: 1939-08-09
Filing date: 1939-08-09
Publication date: 1939-12-12
Anticipated expiration: 1956-12-12

Description

3 Shee'ts-Sheet l Dec. l2, 1939. R. w. WHANN ROTARY MACHI'NE BUSHING ARRANGEMENT Filed Aug. 9, 1939 Dec. l2, 1939, R. w. WHANN .2,182,935

ROTARY MACHINE BUSHING ARRANGEMENT Filed Aug. 9, 1959 5 sheets-snede Dec. 12, 1939.

R. w. wHANN ROTARY MACHINE BUSHING ARRANGEMENT Filed Aug. 9, 1959 3 Sheets-Sheet 3 Patented Dee. 12, 1939 I 2,182,935

UNITED STATES-PATENT` OFFICE ROTARY MACHINE BUSHING ARRANGE- IVIENT Rural Welton Whann, Los Angeles, Calif., assignor to Emsco Derrick & Equipment Company, Los Angeles, Calif., a corporation of California Application August 9, 1939, Serial No. 289,225

7 Claims. (Cl. Z55-23) My invention relates to improvements in table Fig. 2 is a fragmentary sectional view taken as and bushing assemblies of thegeneral type which indicated by the line 2 2 of Fig. 3. e are employed on rotary machines in the drilling` Fig. 3 is a horizontal fragmentary sectional of oil wells. view taken as indicated by the line 3-3 of Fig. 1. It is the general object of my invention to pro- Fig. 4 is a perspective view of the rotary table, I vide the rotary machine with a table, a table drive bushing, and the table bushing in separated bushing, and a drive bushing, in which the table relationship so that the shape of the parts and bushing and drive bushings are separately drivarrangement of the shoulders may be Clearly i1- en by and supported within the table opening in iustrated. order that driving forces or weight of the drive Fig. 5 iS a fragmentary elevational view show- 10 `bushing will not be transmitted to the table bushins the drive bushing removed and the Slips in ing. 'I'his general subject is similar to that of position in the table bushing and supporting the the copending applications of Black and Brewdrill Dipester, seriei No. 197,400, Rotary machine; David- Fig. 6 is a fragmentary sectional view showing son, Serial No. 228,585, Rotary machine and bush.. an alternative form shoulder arrangement of the ing therefor; and Davidson, Serial No. 233,967, drive and table bushings, this Section being taken Rotary machine, which applications are owned through the shouldered portion of the drive bushbyapplicants assignee. ing.

My invention relates to a specific improvement Fig- 7 iS a Similar fragmentary Sectional View over the prior art and consists essentially in s of the alternative form of my invention. this a0 combination in which the table opening has but a, view being taken through the shouldered section Single supporting shoulder which lies in a single 0f the table buShinghorizontal plane and in which the table and drive Referring to Figs. 1 to 5, inclusive, the numeral bushings are so formed that when they are as- Il represents a base on which a rotary table I2 sembled the supporting shoulders on these two iS rotatably Supported by amain bearing M- The 25 bushings also rest in the same plane. This artable l2 Supports a ring gear l5 Which iS engaged rangement leads to simplicity and enables a very by a Pinion "i, Which pinion iS Supported 0n a compact bushing arrangement with the upper shaft I1 which may be rotated through the mesurface of the bushing or fimshings flush with dium/of a sprocket I8. The general construction the top surface of the table, of the rotary machine does not constitute the es- $0 It is accordingly an object of my invention to sence of the present invention and my invention provide a rotary machine having a rotary table Which may be incorporated in any of the Various and bushing assembly in which the table has but designs 0f rotary machines nOW in COInmOn use a single shouldered section at the upper end of in the industry Will be describedthe table opening and in which both the table The table I2 has a table opening 24' which is 8l bushing and the drive bushing are veawh sepa concentric to the axis of rotation and has a shoulrately supported by a single supporting shoulder dered Section 2.1 and a skirt Section 28- The in the shouldered section, the supporting shoulshouldered Section ls preferably 0f polygonal ders of the bushings being located in the Same crosssection and has vertical walls 29 which horizontal plane when the parts are thus as constitutesadriving shoulder and hasalateralor 4( semblei horizontal wall 30 which constitutes a supporting Other objects and advantages of my invention shoulder'. The supportmg shoulder. 3u m my In' will be pointed out in the course of the following vent-lon 1s located m a single horizontal plane' It will be noted that the vertical walls 29 are podeta1led description of alternative forms of my sitioned at an les to each th th t 1 45 invention. It should be understood that various g o er so a m p an I there are a series of circularl arran ed ockets modifications and alterations may be made 1n the 3| which Surround the upper d of thge skrt p0r structure 0f my invention Without departing from tion 28 and which constitute the upper end of the the spirit and scope thereof as dened in the aptable opening 24 It should be further noted pended C ialInS. that each pocket 3| is formed by a pair of verti- 50 Referring t0 the drawings in detal cal walls or driving shoulder means 29 and a part Fig. 1 is an elevational view partly in section or portion of the supporting wall or supporting showing a preferred form of my invention, this shoulder 30. The number of pockets 3| which view being taken as indicated by the line I-I are provided may be varied, but it is preferable of Fig. 3. to have eight pockets in order to provide at least 55 four areas of support for each of the bushings, as will be described in the course of the following detailed description. It is also preferable that these pockets be equally spaced in circular ar-A rangement and that they be of the same size and shape in order that the bushings need not be placed in lany certain manner other than is necessary for one bushing nesting with relation to the other.

In Fig. 5 I have illustrated a table bushing 31 positioned in place within the table opening 24. This table bushing is preferably split into two halves 38, as shown in Fig. 4, so that it may be installed in the table opening while a drill pipe, such as 48, is extending through one table opening. The table bushing 31 has an upper shouldered portion 4| and a lower cylindrical portion 42. The shouldered portion 4| rests in the shoul dered section 21 and has an upright driving shoulder 43 which engages the driving shoulder 29 in certain of the pockets 3| whereby relative rotation of the table and bushing is prevented and whereby the table may be caused to drive the table bushing. The shouldered portion 4| also has a lateral supporting shoulder 44 which may be considered as being formed of a plurality of supporting shoulder portions. The supporting shoulder 44 is adapted to engage the supporting shoulder 30 in certain of the pockets 3|, as will be described. It will be noted that the shouldered portion 4| is substantially rectangular in a crosssection and that it includes corners or projections 45 which are adapted to extend into alternate pockets 3|. Each of the corners therefore provide a supporting shoulder portion and a driving shouder portion which engage a supporting shoulder portion 30 and a driving wall portion 29 in certain of the pockets 3|.

The cylindrical portion 42 of the table bushing 31 has a cylindrical wall 46 which may engage the wall of the skirt section 28. 'I'he table bushing has an inner wall 41 which is conical or tapered, as illustrated, and receives a plurality of pipe supporting slips 48 which, as illustrated in Fig. 5, engage and support the drill pipe 40. There are preferably three slips which are inserted into the table opening from the top thereof by workmen on the derrick floor, and which slips may be provided with suitable handles, not shown.

This table bushing 31 is concentrically supported in the table opening and supports the slips 48 in a concentric and aligned position in order that the drill pipe 40 will be properly engaged and supported. It is found in practice that when the parts are not thus supported there is considerable injury done to the drill pipe 40 which weakens and makes it unsafe for operation and requires replacement.

In Figs. l to 3, inclusive, I have illustrated my invention with a drive bushing 5U in place and with the parts in the position they occupy when a drive kelly 49 is being driven. This drive bushing or kelly bushing, as it is sometimes referred to, is preferaby formed in two parts 5|, as illustrated in Fig. 4, and has a central opening 54 which is preferably of rectangular cross-section or other polygonal cross-section corresponding to the cross-sectional shape of the kelly 49.

This drive bushing 50 has a shouldered portion 56 which has vertical Walls 59 arranged at angles to each other and which constitute a driving shoulder which may be considered as dividing into driving shouldered portions, this driving shoulder 59 being adapted to engage the driving shoulder 29 in certain of the pockets 3|. It will be noted that the shouldered portion 56 has the yshape of an eight-pointed star, thus providing a series of corners or projections 60 which extend into each of the pockets 3|. Therefore, there is driving engagement of each projection with the driving walls of each pocket 3|.

Alternate projections 60 are provided with depending portions 6|, the lower ends of which provide a supporting shoulder 62, this supporting shoulder 62 being divided into portions, there being a portion formed on each of the depending portions 6|. The drive bushing is positioned in the table opening so that the projections including the depending portions 6| and the supporting shoulder portion 62 rest in the pockets 3| which are unoccupied by the projections 45 of the table bushing 31. This is illustrated in the horizontal sectional view, Fig. 3.

The supporting shoulder 62 engages the portions of the supporting shoulder 3U which are within the pockets 3| occupied by the depending portions 6|. The depending portions 6| are of such a size that there is a small space 63 provided between the drive bushing and table bushing in order that there will be no contact of these parts. The projections 60 which do not have the depending portions 6| are provided for two reasons, first, to give additional driving shoulder area, and, second, to ll the upper ends of the pockets in which the projections 45 rest in order that the upper surface of the table and bushing arrangement will be substantially smooth.

Ihe drive bushing 50 has a depending portion 65 of conical exterior which extends into the table bushing 31. This portion 65 is provided so that the driving shoulders of the opening 54 may be suciently long to properly distribute the driving force to the kelly 49. It will be noted that vthis space 63 between the drive bushing and the table bushing exists between the portion 65 and the table bushing so that there is no contact whatsoever between these parts.

From the foregoing it will be seen that there is no weight transmitting contact between the drive and table bushings, since these parts are preferably separated by the small space 63. The table therefore independently supports the drive bushing and the table bushing, and the table also independently drives the drive bushing and the table bushing. This supporting and driving of the bushing is accomplished by drive shoulders formed wholly Within the table opening and by a single supporting shoulder located in a horizontal plane which is also located within the table opening. The table bushing may remain in place at all times ready for use, but is used only when the slips 48 are in use. The table bushing of my invention is not called upon to support or drive the drive bushing and therefore the walls or shoulders thereof are not subjected to wear which would result if the table bushing supported and drove the drive bushing. It will be seen therefore that the interengaglng shoulders and surfaces between the table and table bushing will remain in good condition and alignment over a long period of time and will support the slips 48 in a concentric and aligned position over long periods of use.

In Figs. 6 and 7 I have illustrated an alterna.- tive form of my invention which enables both of the shouldered sections of the two bushings to be made of equal height. As shown in Fig. 6, the table bushing 31a, which resembles the table bushing 31 except for the differences which will be pointed out, is provided with a slot through which the corner or projection 60a of the drive v bushing soa extends'. n wm be noted that uns projection 60a is of the full height of the pocket 3Ia and need not be provided with depending portions as in the iirst form of my invention. As

shown in Fig. 7, the table bushing 31a is provided with a shouldered portion having corners or projections 45awhich also are of the same height as thev pockets 3Ia. To accommodate these projections 45a the drive bushing 50a is provided with slots 8l.

This arrangement of my invention enables both bushings to be supported on the same horizontal supporting shoulder of the rotary table and enables a nesting of one bushing within the other,

thus enabling both bushings to be flush with the top of the table and giving ample space to incorporate means, not shown, for locking the bushings in the rotary table.

In the foregoing I have illustrated the two shoulder portions and a driving shoulder; a table bushing in said opening having a driving shoulder engageable with said driving shoulder oi' said table opening, and having a supporting shoulder engageable with a part of said supporting shoulder portions; and a drive bushing in said table opening having a driving shoulder engageable with said driving shoulder of said table opening, and` having a supporting shoulder engageable with a part of said supporting shoulder portions, said supporting shoulders of said bushings being in the same horizontal plane.

2. In a rotary machine of the class described, the combination of: a base; a rotary table supported by said base, said table having a table opening in which there is a plurality of circularly arranged pockets, each pocket having supporting and driving walls, the supporting walls being in the same horizontal plane; a table bushing in said opening having a shouldered portion which includes driving and supporting shoulders and which rests in at least one of said pockets and being engageable with the shoulders thereof; and a drive bushing in said opening having a shouldered portion which includes driving and supporting shoulders and which rests 4in at least one of said pockets and being engageable with the shoulders thereof, said supporting shoulders of said bushings being in the same horizontal plane.

3. In a rotary machine of the class described, the combination of: a base; a table rotatably supported by said base, said table having a table opening with circularly arranged pockets having supporting shoulders located in the same horizontal plane; a table bushing in said table opening having a shouldered portion resting in certain of said pockets; and a drive bushing in said table opening having a shouldered portion resting in other of said pockets, said shouldered portions of said bushings having supporting shoulders located in the same horizontal plane.

4. A combination as defined in claim 3 in which said shouldered portion of said drive bushing extends above said table bushing and has depending means on which said supporting shoulder thereof is formed.

5. A combination as defined in claim 3 in which said table bushing has slot means through which extends at least a part of said shouldered portion lof said drive bushing.

6. A combination as deiined in claim 3 in which both of said bushings are substantially flush with the top of said table and in which said table bushing has slot means through which extends at least a part of said shouldered portion oi said drive bushing. v

'7. In a rotary machine of the class described, the combination of a base; a table rotatably supported by said base, said tablel having a table opening with a series of circularly arranged pockets having supporting shoulders located in the same horizontal plane; a table bushing in said table opening having a shouldered portion having projections resting in alternate of said pockets; and a drive bushing in said table opening having a shouldered portion having projections resting in other of said pockets, said projections of said bushings having supporting shoulders located in thev same horizontal plane.

R. WELTON WHANN.