US3736083A

US3736083A - Ram tip securing arrangement

Info

Publication number: US3736083A
Application number: US00213315A
Authority: US
Inventors: R D Mitchell
Original assignee: Combustion Engineering Inc
Current assignee: Combustion Engineering Inc
Priority date: 1971-12-29
Filing date: 1971-12-29
Publication date: 1973-05-29
Anticipated expiration: 1990-05-29
Also published as: CA969422A; GB1409308A

Abstract

A ram shaft for a briquetting press having a removable shaft tip with the tip being secured to the shaft by a pair of wedge shaped members that extend through aligned passageways formed in the ram shaft and the tip member. When occupying one position, the wedges are effective to retain the removable tip in place. They may be reversed however and used to forcibly break the connection between the tip and the ram shaft.

Description

United States Patent 1 Mitchell 1 May 29,1973

73] Assignee: Combustion v [54] RAM TIP SECURING ARRANGEMENT [75] lnventor: Robert Davis Mitchell, Solon, Ohio Engineering, Inc., Windsor, Conn.

[22] Filed: Dec. 29, 1971 [21] Appl. No.: 213,315

[56] References Cited UNITED STATES PATENTS 2,393,130 1/1946 Toulmin ..425/78 X 7/1946 Ashbaugh ..425/354 X 2,404,559 2,738,550 3/1956 Groves ..425/352 3,070,003 12/1962 Stacy "425/415 X Primary Examiner-J. l-Ioward Flint, Jr. Attorney-Ham's G. Luther and Radford W. Luther [57] ABSTRACT A ram shaft for a briquetting press having a removable shaft tip with the tip being secured to the shaft by a pair of wedge shaped members that extend through aligned passageways formed in the ram shaft and the tip member. When occupying one position, the.

wedges are effective to retain the removable tip in place. They may be reversed however and used to forcibly break the connection between the tip and the ram shaft.

10 Claims, 12 Drawing Figures PATENIEL W29 I975 3, 736 O 83 SHEET 1 0F 3 FIG -5 PATENTELHAYZQ I975 SHEET 2 OF 3 FIG 6 -36 54 FIG 7 FIG 8 PATENTEL 3,736,083

SHEET 3 OF 3 RAM TIP SECURING ARRANGEMENT BACKGROUND OF THE INVENTION Briquetting presses are employed to form dense briquettes of metal particles such as shavings and borings so that this waste material may be efficiently smelted and reused. Thesepresses conventionally employ a ram shaft which cooperates with a suitable die and anvil to densely compact the metal particles into a briquette. The ram shafts are provided with a removable tip for this compacting operation with the tip typically being replaced approximately every 2 days when a machine is operated at normal capacity. It has been the practice to secure the tips to the ram shafts by means of a threaded stud which is threaded onto complementary bores in both the ram shaft and the ram tip. Since both the tip and the ram shaft are hardened, it has proved difficult to remove the tip for replacement necessitating the use of wrenches with extended handles and with it taking between 2 and 3 hours to change a worn tip and replace it with a new one. The present invention utilizes an improved and novel arrangement for securing the tip in place with the time necessitated for making a tip change with the arrangement of this invention being approximately 20 minutes.

SUMMARY OF THE INVENTION In accordance with the invention, the ram shaft is provided with an axial bore extending inwardly from the end of the shaft to which the tip is secured. The tip itself has a portion that has a diameter equal to that of the ram shaft and another reduced diameter portion which extends into the bore in the ram shaft being somewhat shorter than the bore but generally complementary with the bore. This extended portion of the tip is provided with a transversely extending passageway through it and the ram shaft has a transversely extending passageway generally complementary with that extending through this tip portion. A pair of wedges are received in these transverse passages and are so arranged as to have engaging surfaces disposed at an angle to the axis of the ram shaft and accordingly at an angle to the end walls of the transverse passages. The disposition of the wedges is such that in one position they are effective to securely fasten the tip onto the end of the ram shaft while in another position they are effective to cause the tip to move axially out of the ram shaft for a short distance to break the attachment of the tip to the ram shaft. The diameters of the bore and the extended tip portion are not uniform throughout but are arranged to permit easy withdrawal of the tip from the ram shaft. There is a device for effectively locking the wedges in their interengaging position where they are effective to retain the tip onto the ram shaft.

Accordingly it is an object of the invention to provide an improved arrangement for securing the removable tip portion onto the end of the ram shaft of a briquetting press.

This and other objects and advantages of the present invention will become apparent when considered in view of the following detailed description and annexed drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 through 5 are diagrammatic representations of a briquetting press showing the sequence of operations of the press to produce metal briquettes.

FIG. 6 is an elevational view of the ram shaft and tip secured thereto.

FIG. 7 is a sectional view taken generally from line 77 of FIG. 6.

FIG. 8 is a view similar to that of FIG. 7 but showing the wedges of the securing arrangement in their reversed position with respect to that of FIG. 7.

FIG. 9 is an elevational side view of the wedge that contains the locking recess.

FIG. 10 is a fragmentary elevational view taken line l0--10 of FIG. 9.

FIG. 11 is an elevational view of the locking tab that forms a part of the invention.

FIG. 12 is a side view taken from line 12-12 of FIG. 1 1.

from

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings, wherein like reference numerals are used throughout to designate like elements, the diagrammatic representation of a briquetting press of FIGS. 1 through 5 depicts the chip box 10 and the die 12 which are moved in unison through suitable hydraulic motors (not shown) to and from the position shown in FIG. 1 where the die engages the anvil 14 and the position depicted in FIG. 3 where the die is spaced from the anvil. Anvil 14 is secured to the stationary frame portion 16 of the press and in operation the chip box is maintained with a supply of metallic chips which are suitably tamped into the box by means of conventional tamping mechanism. The ram shaft 18 is positioned so that it passes through the chip box 10 as disclosed and is movable by means of suitable hydraulic motors or the like (not shown) to and from its withdrawn position shown in FIG. 1 and its forward position shown in FIG. 2. Accordingly the ram shaft with the tip 20 secured to it is moved through the chip box into the die 12 where the metallic chips are compacted into a relatively dense briquette 22.

The operation of the briquetting machine is as follows: The chip box and die are moved into a position where the die engages the anvil 14 with the ram shaft being in the position as shown in FIG. 1. FIG. 2 depicts the next step where the ram is moved laterally across the chip box and into the die to form a compacted briquette. As shown in FIG. 3, the chip box and die are then moved away from the anvil while the ram 18 remains in position. The ram is then withdrawn as shown in FIG. 4 and the briquette 22 falls to a suitable collecting device such as collecting belt 24. The chip box and die then return to the position where the die engages the anvil for a repetition of the cycle.

The tip 20 is secured to the end of the ram shaft 18 in a manner which permits the tip to be relatively quickly and easily changed. The tip is provided with an axially extending portion 26 which is received within a suitable bore 28 in ram shaft 18. Bore 28 is axially positioned with respect to the ram shaft and the inner region of the bore has a diameter identified as 30 that is smaller than the diameter of the outer region of the bore with this latter diameter being identified as 32. The region of the bore intermediate the outer and inner regions has a diameter greater than that identified as 32 as best shown in FIG. 7. The axially extending portion 26 of tip 20 is provided at its extremities with diameters generally corresponding with those identified as 30 and 32 to provide a snug fit and with the region of this portion 26 intermediate these extremities having a diameter less than that identified as 30. This arrangement provides for easy withdrawal or removal of the tip with this being desirable because of the tendency to stick due to an accumulation of metallic chips in confined areas. With the arrangement depicted, whenthe tip is withdrawn the distance identified as 34, the tip is relatively free and can be easily further withdrawn and removed.

The ram shaft 18 and the extended portion 26 of tip are provided with generally aligned transverse passageways with the transverse passageway provided in ram shaft 18 being identified as 36 and that in extended portion 26 being identified as 38. When the tip 20 is properly positioned on the end of the ram shaft 18 the annular surface 40 of tip 20 is in engagement with the annular surface 42 at the end of ram shaft 18. When thus axially positioned and when in the proper rotative position, the

transverse passages

36 and 38 will be in proper alignment. It is to be noted that the

end walls

44 and 46 of passage 38 will then be located inwardly of the corresponding end walls 48 and 50 of passage 36.

To secure the tip in place as shown in FIG. 7, wedge shaped

members

52 and 54 are utilized. Wedge shaped member 52 has a recess 56 as shown such that the end regions (or feet) of this member engage the end walls 48 of passage 36 while recess 56 is spaced from end wall 44 of passage 38. When the wedges are positioned as shown in FIG. 7 wedge 54 is driven downward and the two wedges are then effective to firmly hold the tip 20 in place on the ram shaft. It is noted that the surfaces 58 of member 52 and the surface 60 of member 54 are complementary with the end walls of

passages

36 and 38 with these surfaces and walls being semicylindrical in the depicted embodiment.

In order to lock the wedges in their tip securing position shown in FIG. 7, there is provided a locking tab 62 which is of keyhole configuration as shown (FIGS. 11 and 12) which fits within a complementary shaped recess 63 provided in the face of member 54 that engages member 52, with this configuration preventing removal I of tab 62 when the wedges are in position as shown in FIG. 7. The tab 62 may be secured to the member 54 by means of screw 64 adapted to be received in threaded bore 65 in member 54. The lower end of the tab extends below member 54 and when the wedge shaped

members

52 and 54 are in place as shown in FIG. 7 the tab is then bent over the end of member 52 to prevent the wedges from moving relative to each other.

To release the

wedges

52 and 54 from the FIG. 7 position, locking tab 62 is bent from its locking position,

' i.e. away from the lower end of member 52, and wedge 54 is driven up and out of the

passages

38 and 36. Thereafter the wedge 52 is removed from these passages.

When it is desired to remove tip 20 from ram shaft 18 the wedges are removed and reversely positioned as shown in FIG. 8. When in this position wedge 54 may be driven upwardly to break the tip 20 loose from the ram shaft 18. By means of wedge 54 the tip may be moved the distance designated 65 and thereby effectively break the tip loose.

It will be understood that the embodiment shown and described herein is merely illustrative and that changes may be made without departing from the scope of the invention as claimed. Furthermore while the invention has been described in its preferred embodiment with relation to the securing of the removable tip on the end of the ram shaft of a briquetting press, the securing organization of the invention may be used in other and different applications where operating conditions are rather severe and it is desired to secure one member to another but be able to effect removal thereof when desired such as the holding of punches into tools for metal working and construction and the holding of teeth on an edge of excavating devices.

What is claimed is:

1. In a briquetting press the combination comprising a cylindrical ram shaft member and a complementary tip member removably secured to said shaft member said members having annular thrust flanges in engagement when said tip member is properly secured to said shaft member, means for removably securing said members in operative relation comprising a cylindrical projection extending from one of said members and received in a complementary bore in the other of said members with the extreme regions of the projection and bore being in snug fitting relation, aligned passageways transversely of the ram shaft extending through said projection and said other member, the dimension of the passageway axially of the ram shaft in the projection being less than in said other member such that the corresponding end walls of said passageway in the projection are located interiorly of the corresponding end walls of the passageway in said other member when said annular thrust flanges are in engagement and a pair of wedges received in said aligned passageways effective to retain said tip member in operative position on the ram shaft with said wedges having complementary engaging surfaces inclined toward the axis of the ram shaft and in a plane transverse of the axis with one wedge having an opposite surface engaging the end wall of the passageway in the projection adjacent the inner end of the bore and the other wedge engaging the opposite end wall of the passageway in said other member.

2. The organization of claim 1 wherein said other wedge has a relieved portion in its central region so that when said wedges are positioned to retain the tip in operative relation said central portion is spaced from the opposite end wall of the passageway in said projection.

3. The organization of claim 1 including means to lock said wedges in place.

4. The organization of claim 2 including a recess in the surface of one of said wedges that is in engagement with the other wedge and extending to the small end of said wedge, means securing a locking tab in said recess said locking tab being bent over the end of said other wedge.

5. The organization of claim 4 wherein said recess is of a shape to prevent removal of the locking tab when said wedges are in their operative position to secure the tip to the ram shaft.

6. The organization of claim 1 wherein the extreme inner region of the bore has a diameter less than the extreme outer region.

7. The organization of claim 6 wherein the diameter of the projection intermediate its extreme regions is substantially less than the diameter of the bore intermediate its extreme regions so as to provide an annular space therebetween when said members are in operative relation.

8. The organization of claim 7 wherein the diameter of the projection intermediate its extreme regions is less than the diameter thereof at its large end and the corresponding diameter of said bore is greater than its diameter at its small end.

9. The combination of a cylindrical ram shaft member and a removable tip member secured thereto for use in a briquetting press including 'an axially cylindrical projection formed on one of said members and received in a complementary bore provided in the other of said members, a passageway formed in said projection transversely of the ram shaft axis and similar passageways formed in the annular region of said other member surrounding said projection and aligned with said passageway in said projection with the dimension of the passageway in the projection axially of the ram shaft being less than the corresponding dimension of the passageways in said other member so that the end walls of the passageway in the projection lie inwardly of those of the passageway in the other member, a pair of wedges received in said aligned passageways effective to retain the tip on the ram shaft and so formed that when the tip is secured in place the wedges have mating surfaces that are in engagement and inclined relative to the axis of the ram shaft with the opposite surface of one of the wedges being in engagement with the end wall of the passageway in said projection but spaced from the corresponding end wall of the passageway in said other member and the opposite surface of the other wedge being oppositely disposed.-

10. The organization of claim 9 wherein said opposite surface of said other wedge is relieved intermediate its regions so as to in effect form a pair of feet that engage the opposite end wall of the passageway in said other member and with the region of this wedge intermediate these feet being spaced from the opposite end wall of the passageway in said projection.

Claims

3. The organization of claim 1 including means to lock said wedges in place.

9. The combination of a cylindrical ram shaft member and a removable tip member secured thereto for use in a briquetting press including an axially cylindrical projection formed on one of said members and received in a complementary bore provided in the other of said members, a passageway formed in said projection transversely of the ram shaft axis and similar passageways formed in the annular region of said other member surrounding said projection and aligned with said passageway in said projection with the dimension of the passageway in the projection axially of the ram shaft being less than the corresponding dimension of the passageways in said other member so that the end walls of the passageway in the projection lie inwardly of those of the passageway in the other member, a pair of wedges received in said aligned passageways effective to retain the tip on the ram shaft and so formed that when the tip is secured in place the wedges have mating surfaces that are in engagement and inclined relative to the axis of the ram shaft with the opposite surface of one of the wedges being in engagement with the end wall of the passageway in said projection but spaced from the corresponding end wall of the passageway in said other member and the opposite surface of the other wedge being oppositely disposed.