US1120278A - Union-grinding machine. - Google Patents

Description

H. G. GARLSON.

UNION GRINDING MACHINE.

APPLICATION FILED MAR.31,1914.

1,120,278. Patented Dec. 8,1914.

2 SHEETS-SHEET 2.

WITNESSES: M/VE/VTUI? M hyalmarG. Gar/son W Arm/ms ATE HJALMAR G. CARLSON, F WORCESTER, MASSACHUSETTS, ASSIGNOR TO ROCKWOOD SPRINKLER COMPANY OF MASSACHUSETTS, OF WORCESTER, MASSACHUSETTS, A

oonrorron or MASSACHUSETTS.

UNION-GRINDING MACHINE.

menace.

Specification of Letters Patent.

Patented Dec. 8, 1914..

To all whom it may concern:

Be it known that I, HJALMAR G. CARL- SON, a citizen of the United States, residing at Worcester, in the county of lVorcester and State of Massachusetts, have invented a new and useful Union-Grinding Machine, of which the following is a speci ication.

Although this invention is designed particularly for grinding unions, and is shown in the drawings as applied to that purpose, it is to be understood that it is capable of being applied to the grinding together of any two surfaces of a spherical or substantially spherical form.

The principal objects of the invention are to provide for grinding two such surfaces together in such a manner that they Wlll fit each other when alined or when out of alinement; to provide for continually and uniformly moving the two spherical sur faces relatively to each other durin the grinding operation for the purpose-o. pro ducing a true spherical surface on each of the parts; to provide a simple, durable and practicable mechanism for accomplishing these results of such form that it occupies comparatively little space; and to rovide a construction in which a plurality oi grinding units can be set up on one machine in a convenient manner and operated by one operator.

The invention also involves unprovements in details of construction and combinations of parts as 'will appear hereinafter.

Reference is to be had to the accompanying drawings in which, Figure 1 is an end elevation of a machine constructed in accordance with this invention for grinding pipe unions; Fig. 2 is a plan thereof with parts in section on a line slightly above the table; Fig. 3 is an enlarged plan of one of the units of the machine; Fig. 4 is a sectional view on the line H of Fig. 3; Fig. 5 is a sectional view on the line 55 of Fig. 2; Fig. 6 is a side elevation of part of the mechanism shown in Fi 2; Fig. 7 is a sec tional view on the line 7 of Fig. 2; Fig. 8 is a sectional view on the line 8-8 of Fig. 2; Fig. 9 is a fragmentary view showing the union members in a position opposite that shown in Fig. 4; and Figs. 10 and 11 are elevations of the eccentric and its connected parts showing different positions thereof.

The invention is shown as embodied in a machine provided with a supporting base 10 for a table 11 on which the parts of the machine are supported. On this table are legs 12 extending upwardly carrying a platform 13 for receiving the work to be operated upon. Underneath the table the main shaft 15 is supported carrying a driving pulley 16. This shaft extends along the table and is provided with means for 0 erating the several units of the machine. his means 'is shown as com arising a series of gears or pinions l7 eacli operating a gear 18 fixed to a transverse shaft 19. One of these shafts and sets of gears is arranged for each unit of the machine.

Fixed to the end of one of the shafts 19, preferably the end one, is a crank disk 20. This disk is provided with a T-slot 21 in which is adjustably mounted a bolt 22 for connecting the end of a itman 9.8 with the crank. By adjusting t is bolt along the slot the eccentricity, and therefore the throw, of the pitinan can be modified. The other end of the pitman is connected by a bolt 24 with a slide rack 25 which operates in a guide 26 in a bracket on the side of the frame. This rack 25 is provided with teeth on the bottom meshing with a pinion 27 fixed to a transverse shaft 28. This, therefore, constitutes a rack and pinion drive for this shaft. The shaft 28 is supported under the table and is provided on its 0 pcsite end with a gear or pinion 29 mes iing with a rack 30 which slides in ways under the front side of the table and extends substantially throughout the length of the table. This rack is provided with a second set of rack-teeth 31 on one edge thereof meshing with a plurality of pinions 32, one :ach unit of the machine. Each pinion red on a vertical shaft 33 extending up through the table and carrying on the top thereof a head 34-. This head is provided with a ring 35 secured to the top thereof for receiving-inside the same one of the members A of the union to be ground. It

will be obvious that the rotation of the main shaft results in an oscillation of this union on its own ertieal axis. The parts preferably are so designed that the union will turn through either more or less, prefcomplete rotation for the reason that it is tilt desired that any irregularity in the grinding shall not be repeated in the same place on subsequent operations.

Each of the shafts 19 is mounted in bear ings, as 39, on the under side of the table and each one is provided with an eccentric 40. This eccentric is provided with an eccentric strap 41 of any desired character to which is connected a rod l2 secured by a set screw 43 at the end in a yoke 44. The effective length of the rod can be adjusted obviously by changing the position of the rod in the yoke. At the top the yoke is bifurcated and provided with a transverse perforation for receiving a pivot pin 45. This pin passes through an elongated slot 4:6 in the end of a lever 4:7. The elongation of the slot, as indicated in Fig. 4:, is for the purpose of allowing a little play. On the other end of this lever is a head 48 adapted to support a weight 49 and provided on the bottom thereof with a socket member 50 for receiving the other member B of the union to be ground. Inside the socket member 50 is a central projection 51 which is fixed to the head by a screw or the like and serves to center the member B in the socket member to hold it in position therein. The head 48 is provided with a handle 52 for manipulating it, as will appear hereinafter. The lever 47 is fulcrumed and guided by means of the following mechanism: The table is provided with a vertical perforation therethrough for receiving a cylindrical plunger 55. On the top this plunger is pro vided with a transverse pivot pin 56 to which is pivotally connected a fulcrum piece 57 which has a bearing for the lever 4.8. It will be seen that this plunger is free to move up and down and that the lever is free to turn on the pin 56 and also on the plunger as centers, so that while the lever cannot move sidewise as a whole, it can move up and down and can rock up anddown at each end also sidewise at each end. Of course, it can turn in its bearin in the fulcrum piece. Extending down from the platform 13 is a hook 59 for engaging the lever 47 and holding up the head d8 when the parts are not in use. Tn operation, a female pipe union memher A is placed on the disk 84 within the ring 35 and a male union member B within the socket member 50. Grinding material is placed on the spherical seat at the top at the lower union member, and the upper union member is allowed to rest on the lower one in order that the grinding operation may take place This operation is er formed by the series of motions hereto ore described. The seat on. the top of the female member A of the pipe union and the lower end of the male member B being previously turned up to a spherical form, as is commonly done in this art, it will be understood that the weight 49 holds the upper member B down on its seat. Consequently, the turning motion of the member A results in performing a part of the grinding operation. This turning motion is reversed at intervals so that if there is any irregularity in either member of the union, it will not on any two subsequent operations of the lower member come into the same position thereon. This result is assisted by the fact that the lower member does not turn through an even number of revolutions. The motion of the member B is a compound rocking motion. The rise and fall of the eccentric rod 4:2 rocks the upper member in the plane of the paper in Fig. 4, the plunger 55 ofiering no resistance to this motion. But the sidewise motions due to the eccentric when transmitted through the fulcrum member 57 to the head 48, are translated, not into a similar sidewise motion of this head, but into a rocking motion on an axis transverse to the axis on which the head is rocked by the up and down motion of the eccentric rod.

This will be obvious from the fact that the fulcrum member prevents the lever 47 from moving sidewise at the fulcrum point and from the fact that the lower end of the pipe union member B is centered in the spherical seat of the lower member. Consequently, this attempted sidewise motion is converted into a rocking motion about the center of the sphere of which the seats of the union members form a part. In other words, two rocking motions are secured about two axes at right angles to each other, both passing through the center of this sphere. When it is desired to change the unions being ground, the head is raised by the handle 52 and the two unions taken out. It is found in practice that it is not necessary to fasten these unions in position, as a little turning motion on their part is not objectionable, and tends to make the grinding operation all the more uniform. lif it is desired to keep one of the units out of operation while the machine is working, the unions can be taken out of it and the 'lever 47 allowed to rest on the hook 59.

In practice, it is found that this machine grinds the previously turned surfaces to an accurate spherical joint so that it is not necessary to have the union members in alinement with each other in order to get a good joint, that the result is accomplished in a very short time with the expenditure of a small amount of power, and that a single man can readily supply, and take care of,

four or more units and secure a large production.

ma am Although I have illustrated and described the invention as applied only for the purpose of grinding unions, and shown only a single form of mechanism, I am aware of the fact that the principle of the invention as expressed in the claims can be carried out in other forms and can be used for other analogous purposes. Therefore, I do not wish to be limited in these respects but What I do claim is- 1. In a machine for grinding unions, the combination with two heads each having means for supporting and vcentering one of the two halves of the union, of means for turning one of said heads on its own axis,

and means for rocking the other head while held in position to keep the two halves of the union in contact.

2. In a machine for grinding unions, the combination with two heads located facing each other and each one adapted to hold one member of a pipe union, of means for turning one of said heads about its own axis, and means for simultaneously rocking the other head about the center of the sphere of which the seats of the two members of the union form a part.

8. In a union grinding machine, the combination with two heads arranged in alinement with each other for supporting the two halves of a union, means for turning the one of said heads supporting the female union member constantly about the axis of said female union member, and means for simultaneously giving the other head a compound transverse rocking motion.

l. In a union grinding machine, the combination with two heads for supporting the two members of the union, one of said heads facing upwardly and the other downwardly, whereby the upper head and union member therein rest upon the lower union member, and means for rocking the upper head and its union member about on the seat furnished by the lower union member.

5. In a union grinding machine, the combination with two heads, one facing upwardly for supporting the female member of a union and the other downwardly for holding the male member, whereby the male union member rests upon the female union member, means for turning the lower head of the axis thereof, and means for rocking the upper head on the seat furnished by the lower union member and about the center of the sphere in which said seat is located.

6. In a union grinding machine, the combination with two heads for supporting the two members of a union, one of said heads facing upwardly and the other downwardly, whereby the upper union member rests upon the lower union member, and means for rocking the upper head and its union member on the seat furnished by the lower union member in two transverse planes.

7. In a union grinding machine, the com- 'on its own vertical axis, means for holding the other member of the union on said seat and pressing it down u on the seat by gravity, said means being ree to move universally, and means for rocking the upper member of the union about two transverse axes both concentric with the spherical surface of which said seat forms a part.

8. In a union grinding machine, the combination with two heads for supporting the two halves of a union, one facin upwardly and the other downwardly, an the latter located over the former'and adapted to rest thereon by gravity when the union is inserted, means for oscillating one head on its own axis, and means for simultaneously rocking the other head about a transverse central axis.

9. In a union grinding machine, the combination of a head for sup orting a member of the union to be ground a crank, means connected with the crank for oscillating said head about a vertical axis, a second head havin means for receiving the other member o the union located above the first'head and adapted to rest thereon by gravity when the union members are in position, and.

means operated in conjunction with'said crank for rocking the upper head on a transverse axis inter'sectin the first named axis.

10. In a union grini' l bination of a supporting table, a vertical shaft extending through the table, means on the top of said shaft for supporting one member of the union to be ground, a crank, means for irning the crank, a rack connected with said crank and reciprocated thereby, a shaft having a pinion thereon meshing with the rack, and means for transmitting the motion from the shaft to said vertical shaft for oscillating the letter.

11. In a union grinding machine, the combination of a vertical shaft, means'on the top thereof for supporting the female half of a union to be mind with the seat up, means for oscillating said shaft on its own axis, a head above said shaft having means ing machine, the com- M0 in the bottom thereof for receiving the other combination with means for supporting the female member of a pipe union with its seat up, means for holding the other member of the union upon said seat, the last named means comprising a weighted head, a lever fixed to said head, and means for raising and lowering the outer end of said lever to rock the upper member of the union on said seat,

" male member of a pipe union with its seat 'bination with means for supporting the fe-,

up, a weighted head for holding the other member 0 the union upon said seat, a lever fixed to said head, and an eccentric arranged in a plane transverse to said lever and pivotally connected with the outer end thereof for rocking the upper unionmember onasaid seat. I

14; In aunion grinding machine, the commale member of a pipe union with its seatv exposed, a head for'holding the other member" of the union upon said. seat, a lever fixed to said head, and means for raising and lowering the outer end of said lever to rock the second member of the union on said seat and for rocking said lever laterally.

- 15L In a union'grindin machine, the comb'ination with means for olding the female member'of a pipe union with its seat on top, and means for turning said member on its own-vertical axis, of a head for holding the other, member of the. pipe union with its seat down on'the first named seat, a lever fixed to said head andextending therefrom, and means for giving the outer end of said lever a substantially circular motion in a plane transverse to the lever, whereby said upper memberof the union will be rocked on its seat during the up and down motion of the lever. I 1 v 16. In a union grinding machine, the combination with means for holding thefemale member of a pipe union with its seat on top,

of a head for holding the other member of the pipe union with its seat down on the first named seat, a-lever fixed to said head and extending therefrom means for giving the outer end of said lever a substantially circular motion in a plane transverse to the lever, whereby said upper member of the 13. In a union grinding machine, the combination with means for supporting the fema am union will be rocked on its seat during the up and down motion of the lever, and means permitting saidup and down motion and for restricting the sidewise motion of the lever and transmitting it. to said head as a rocking motion.

17 In a union grinding machine, the combination with means for holding the female member of a pipe union with its seat on top,

of a head for holding the other member of the pipe union with its seat down on the first named seat, a lever fixed to said head and extending therefrom, means for giving the outer end of said lever a substantially cir-v 18. In a union grinding machine, the combination of means for sup orting and turning the female member of a pipe union, a head above said'means havin means on the bottom thereof for holding t e other member of the pipe union on the top of the first named member, a leverfixed to said'head and projecting therefrom, an eccentric.v rod connected with the end of said lever for operating it, a fulcrum member connected with the lever between its ends, a freely movable vertical plunger below the fulcrum member pivoted to the fulcrum member on an axis transverse to the lever, means for operating said eccentric rod, and means for turning the first named means.

In testimony whereof I have hereunto set my hand, in the presence of two subscribing Witnesses.

'IIJALMAR G. CARLSON. Witnesses: l

' Cnar'ron KENDALL, Greener A. lPnArr.

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