|Publication number||US1319075 A|
|Publication date||Oct 21, 1919|
|Filing date||Jul 15, 1916|
|Priority date||Jul 15, 1916|
|Also published as||US1327710|
|Publication number||US 1319075 A, US 1319075A, US-A-1319075, US1319075 A, US1319075A|
|Inventors||George P Hemstreet|
|Original Assignee||Internat Pavement Company|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (1), Classifications (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
4 SHEETSSHEET I.
IN VEN T00 THE CDLUM HIA PLAN OmiRM-I (20.. WASHINGTON. D. c.
Patented Oct. 21, 1919.
4 SHczrs-snzsr 2.
G. P. HEMSTREET.
APPLICATION FILED JULY 15,1916. 1,319,075. Patented 001. 21,1919.
9- INVENTOR j r [y anion/v5 G. P. HEMSTREET.
APPUCATION FILED JULY 15.1916.
1,319,075. Patented Oct. 21,1919.
4 SHEETS-SHEET 3.
I m INVENTOR MM //a H/ ATTORNEY G. P. HEMSTBEET. PRESS.
APPLICATION FILED JULY 151N916.
1,319,075. Patented 0d. 21,1919.
4 SHEETS-SHEET 4,.
IH HHIIIHII' IN l/E/V TOR and at. Extending rearwardly from the lootv UNIT D STATES PATENT orr on.
GEORGE r. HEMSTREET, or. rLAsmNes-oPoN-HtinsoN, NEW YORK, ASSIGNOR mo 7 INTERNATIONAL PAVEMENT COMPANY, or NEW YORK, N. Y., A CORPORA- TION OF CONNECTICUT.
Application filed July 15,1916. Serial No. 109,428.
To all whom it may concern:
Be it known that I, GEORGE P. HEMSTREET, a citizen of the United States, residingat Hastings-upon-Hudson, New York, have 1nvented an Improvement in Presses, of which the following is a specification.
This invention relates to presses for .compressingasphaltic or other blocks or tiles for paving and for other purposes, and more particularly to presses adapted for use 1n the manufacture of so-called anchor pa-vmg blocks.
The accompanying drawings show one preferred illustrative embodiment of this invention. and therein Figure l is a front elevation; Fig. 2 is a side elevation partly in section; I
Fig. 3 is an enlarged front view of the pressure head and cooperating mold, also partly in section;
Fig. e is a plan View of the mold plate;
Fig. 5 is a section on the line .5-5of Fig. 4; and
Figs. 6 to 11 inclusive are detail vlews later to be referred to. p
The general construction of the press herein shown may be best understood by reference to Figs. 1 and 2. A rectangular frame is in this instance, built up from ordinary commercial structural steel and comprises two upright channel beams 1 and 2 connected at the top and bottom by cross members 3 tom of the frame are a pair of channel irons 5 and 6 secured at their forward ends to the lower. part of the rectangular frame and at their rear ends to upright members 7 and 8.
Four diagonal braces 9, 10, 11 and 12 are secured to the upper and lower ends of the.
rectangular frame and extend rearwardly toward and are secured to the uprights 7 and 8. The press is hereln shown as a toggle press, the toggle being formed by upper and lower members 13 and 14, the uppertoggle member 13 being fulcrumed at 15 in bearings l6 and 17 which are fastto the upper cross member of the rectangular frame. A cross head 18 1s carrled by the lower toggle member and mounted upon this cross head is the pressure head 19 of the press.
Means actuating the toggle and thereby moving the pressure head vertically are herein shown as a steam cylinder 20 mounted upon trunnions 21 and 22 which are jour- Specification of Letters Patent.
PatentedOct. 21, 1919.
naled in the frame substantially at-theinter- Q section of the diagonal braces 9'12 and the upright supports 7 and 8.- The cross head 18 is slidable in vertical-guideways 22 and 23.- Depending from the-cross head 18 area pair of adjustable rods 27 and 28' carryingat their lower ends a transversely extending mold plunger support26 upon Which is mounted a mold plunger 29, Which constitutes the bottom of themo'ld to-be described.
near the lower ends of therectangula'r frame are a pair of brackets 24:, 25 *upon which 'Fast to the upright side members 1 and 2 y the plunger support rests during the compressing of any materlal contained in the mold. The depending rods 27 and 28 are slidable'in the plunger. support 26 and are so adjusted that upon the descent of-thepressure head the plunger 26 will rest upon' the brackets 24., 25 .prior to the application of pressure by the toggles. After the compressing i complete, and the pressure head I is partially withdrawn from the mold the depending rods, 27 and 28 will raise the plunger support 26 andithereby raise the mold plunger 29. With proper adjustments the -moldplunger 29 may thus be brought to a level with the top of the mold plate 30 thereby ejecting the compressed article from 'the'mold so that it may be readily removed from the press by the'operator;
It is desirable in applying pressure to a formed or partly formed semi-plastic article, such as an asphaltic composition block, that the pressure be applied in such a manner that the shape of the article .will not be distorted. For illustration reference may be made to the manufacture of asphalt com- I position paving blocks. These blocks com prisevarious ingredients with an asphaltic composition as a binder and are originally compressed and approximately sized by suitable I apparatus. .Oftentimes with certain' blocks this first operation does not sufliciently compact the materials of which the block is made,and it is therefore desirable to repress the blocks. 1
In repressing these blocks it is preferable that the initial shape and size be retained a far aspo'ssible. If pressure'be applied merely from-'the top and no means are provided for'retaining the side walls of the block obviously theblock will be distorted.
If, however, even slight pressure be applied to the sides of the block or the sides of the the blocks and also due to the increased time required for such an operation.
Again by way of lllustration reference may be made to the manufacture of socalled anchor paving blocks. An -illustrative anchor block is shown in Fig. 9 of the drawings and therein an anchor member 65 (seeFig. 8) is shown as a strip of; metal bent into .a substantially oblong form and embeddedin the material of the block which may be the ordinary asphaltic composition block composed of crushed stone, stone dust and an asphaltic composition binder. l/Vhen the block is laid with others to form a pavement, the anchor member projects downwardly from the block and is engaged by the material :of the road foundation. Preferably the anchor member is embedded in the paving block when the-latter is slightly softened which may be just after the initial compressing before theblock has thoroughly cooled and hardened, or after reheating in a steam bath or otherwise. 'If the block is not firmly held while the anchor member is being forced into the block the latter may easily be split or cracked- It is therefore desirable as in the case of repressing blocks that a certain degree of pressure be applied to the sides of the block orat least that the sides of the mold be held firmly against the sides of the block during the embedding of the anchor member.
Means are herein provided for securing these desired results; the same being herein shown and described as follows: A Station ary mold plate 30, (see 4) is mounted between the rectangular frame members 1 and 2 and rigidly secured thereto. 7 The mold is constituted by four side walls, 31, 32, 33 and The mold walls 31 and 32 (see Fig. 4) are formed in the mold plate 30 while the mold walls 33 and 34'are formed in a block 35 which is mounted to slide diagonally in the mold plate 30 along a line substantially-at an angle of 45 degrees to the walls 31 and 33 of the mold. Stud bolts 36 and 37 are screwed into the block 35, extend outwardlythrough the plate 30 and carry at their outer ends nuts 38 and 39 between which and the plate 30 are compression springs 38 and 39 tending to hold the mold block 35 in retracted position to open or enlarge the mold.
Suitable means for moving the mold block the side walls 33 and 3470f the mold. The,
' valves 62 and 63.
a wedge 40 is preferably actuated by the presthe spring is interposed. A nut 45 screwed upon the upper end of the threaded stem of the stud bolt determines the inactive position of the wedge. As the pressure head descends thewedge will be forced betwee the movable and fixed mold plates until the resistance to the downward movement of the wedge operates to overcome the power of the spring 41. Preferably the stud bolt and spring areduplicated asshown in Fig. 4.
The means herein provided for actuating the toggle press, namely the steam cylinder 20 and its cooperating parts, are best shown in Figs. 10 and 11. A piston rod 46 is pivotally attached to the lower toggle member 14 at 47, extends into the steam cylinder 20, and carries a piston 48 (see Fig. 10) provi (led with suitablepiston rings. A suitable stuffing box 49 is provided for the piston rod 46. The steam cylinder is double acting, having steam ports adapted to admit steam to one side of the piston to cause the toggles to be moved into or toward alin'ement, and
to the other side to cause thetoggles to be withdrawn from alinement.
Means to control the operation of the press actuating means,-'include a balanced throttle valve of the cylindrical. type mounted preferably in a valve chamber formed integral with the steam cylinder. The valve comprises a valve 'rod 50 which carries two pistons 51 and 52; suit-able stuffing boxes 53 and 54 being provided for-the valve rod 50; Steam is admitted to the valve chamber through two steam supply pipes 55 and 56 which may lead to a common source of steam supply, and is exhausted from the valve chamber through an exhaust pipe 57 opening from between the valve pistons. Leading to the interior of the steamcylinder are,
ports 58 and 59 while by-pass ports 60 and 61 lead from the main ports 58 and 59- respectively and 'open into the steam cylinderclosely adjacent theend walls thereof; the latter ports being controlled respectively by It will be noted that the ports 58 and 59 will be closed by piston 48 during its travel within the steam cylinder.
Means are shown to provide a positive stop for the movement of the toggles 13 and 14. The cross brace 78 carries a buffer/79 against which the toggles will be forced when in alinement, and the cross brace 80 carries a buffer 81 against which the lower toggle will rest when in retracted position.
Means may be provided to cushion the piston and itsconnected parts during theop-v eration of the press, so that the machine may not be strained as the maximum power is applied or as the heavy toggles are with- V drawn from, alinement; the same being herein provided by the bypass ports 60 and from the right hand side of the piston. As
the piston continues its movement from the position shown theport 58 will be closed by the iston 48 before the piston has reached its full retracted position. In this event the only passage by which the entrapped steam may escape from the right hand side of the piston is through the by-pass port 60. If therefore by the adjustment of the valve 62' this icy-pass port be made sufliciently small the entrapped steam will exert pressure upon the piston 48 opposed to the pressure of steam upon the other side of the piston, thus tending to retard the movement of the piston 48. The valve 62 may be so adjusted that the entrapped steam will escape slowly and thus eventually permit the high pressure steam to force the piston to the right as far a need be.
If now the throttle valve be moved to neutral position, both ports 58 and 59 will be closed andthe iston'48 will remain in full retracted position until it is desired to operate it again.
When in the operation ofthe machine the throttle valve is moved to the left, the port 58 will be opened to the steam supply. fi-team will not now be admitted to the steam cylinder through this port because it is closed on the inner side bythe piston 48, but will be admitted only through by-pass port 60. Thus the piston will 'be moved slowly until port 58 is opened when the full pressure of steam will be admitted. Upon movement of the piston to the left (see Fig. 10) the operation of the several parts will be reversed, and the piston 48 will out off port 59 while the entrapped steam on the left hand side of the piston will operate to cushion the movement of the piston and its connected parts, while forcing the toggles into or toward alinement. 1 To hold the anchor member in correct position upon the under side of the pressure head so that it may be carried down with it, aflixed to the block with accuracy and precision, and thereafter released from engagement with the pressure-head, I have provided suitable means herein shown as a slot .66 in the underside of the pressure. head,
'8 for the one shown; I o
As previously noted blocks which are to adapted to receive the anchor member. The
anchor member-is resilient and is sprung slightly before insert on in the slot which vallows it to be retained securely insaid slot and secured to and carried down by the pressure head and attached to or embedded in the paving block. In this particular instance the sides of the anchor member may be sprung together before insertlonin the slot whereupon the sides of the anchor member will bear against the outer walls ofthe slot.
The slot performs another function in that .it gages the extent to which the anchor member Will-pro ect fronrthe finished block; the
depth of theslot providing this gage.
The operation of the press (see Figs. 1 and 2) is controlled by two levers; one lever 67 being pivoted at 68 and connected to the shaft 50 ofthe throttle valve by the link 69, and the other leverbeing'connected to a safety device. 7 The control levers are so situated that the operator of the press must use both hands to bring down the pressure head, thereby greatly minimizing the danger. of injury in the operation of the press. Pivoted at TO'and 71 to the rectangular frame members 1 and 2 respectively just above the mold plate 30, are a pair of up' standing arms 72 and 73 connected by a cross member 74 upon which control lever 7 5 is mounted. The arms 72, 73 are held in normal position under the cross headto prevent its descent by suitable means herein shown as a lever arm 7 6 carrying a weight 77. It will be seen by reference to 1.
and 2 that the control lever 75 must be pulled forwardand held in forward position before the opening of the throttle valve will have any elfect to move the cross head 18, therefore wtheIoperator must place his left hand upon control lever 75- and his right hand upon control lever 67. WVith both hands thus engaged-there .is slight possibility of injury upon the descent of the pressure head.
The operation of the press will be described in connection with the manufacture of anchor blocks. This description willbe sufficient to make the operationsufiiciently clear whenthe press is used .for other purposes; itbeing obvious thatwhen it is desired to repress paving blocks a pressure head without the slot 66 will be substituted be made into anchor blocks are preferably supplied to the operator of the press in slightly softened condition which. may be it before they have thoroughly cooled and harv dened after the first compressing. The anchor member 65 is first inserted in the underside ofthe pressure head by springing I .the two sides of the anchor member-sufliciently to permit it to be inserted'in the slot .66. ,At this time the machine is in the posi-.
tion shown in Figs. 1 and 2 of the drawing; the rods 27 28' holding the plunger support 26 together with the mold plunger 29 in raised position, the mold plunger being substantially on a level with the top of the mold plate 30, while the mold block 35 remains in retracted position. The block may now be placed in position upon the mold plunger. If now the operator pulls the control lever 75 forward to release the safety device, and thereafter pulls the lever 67 forward to operate the throttle valve to admit steam to the rear of the piston 48, the actuating means will tend to bring the toggle into alinement, thereby causing the pressure head to descend. With the descent of the pressure head the plunger support will descend also, carrying with it the mold plunger 29 until said plunger support 26 seats upon the brackets 24 and 25. During the descent of the pressure head the'wedge 40 will be forced between the movable mold block 35 and the stationary mold plate 80 thereby inwardly moving the side walls 33 and 34: of the mold. The continued descent of the pressure head will cause'the anchor member 65 to be forced into the block 64. Slightly prior to the application of pres sure to the block by the pressure head 19, the side walls 33 and 3a of the mold will be moved inwardly by the wedge 40 far enough to contact with the sides of the block and preferably to exert a considerable pressure against the sides of the block. This pressure need not necessarily be sufficient to compress the material of the block but should be sufiicient to hold the block from spreading when the full downward pres sure is applied thereto by the toggles. With the construction and arrangement" here shown a very considerable pressure may be exterted against the sides of the block. The parts are so arranged that preferably this pressure is applied when the lower mold plunger 29 is in pressure-receiving position,
that is when the mold plunger support seats upon the brackets 24 and 25. Thereafter as the toggles come more nearly into alinement, sufficient pressure will be exerted upon the block between the pressure head 19'and the mold plunger 29 to force the anchor member into and thoroughly embed it in the block while the pressure upon the sides of the block is being maintained.
The pressure upon the block may be continued for a longer or shorter time as may be desired to thoroughly embed the anchor member in the block or to thoroughly compact the material of which the block is made. When it is desired to raise the pr sure head the lever '67 is moved back through the neutral position until the throttle valve cuts off the steam supply from the rear of the piston 48, opens the same to exhaust and admits steam to the-front of the piston' 48', thus causing the toggles: to be drawn back out of'a'linementand raislngthe pressure head. The raising of the pressure head ends the downward pressure upon the block and thereafter permits the side walls 33' and 3i'of themoldto be withdrawn from contact with the block bythe' action of'the springs 88,- 39; Uponftrther liftingof the pressurefh'ead, the rods--27, 28" (see Fig. 3) will engage the plunger support 26 andraise the mold plunger 29 in the mold until it is substantially on"alevel with the top of the mold plate 30, thus'liftii'ig and eject ing the block'vertic'ally. from the mold, leaving it-hbwever, in place upon the elevated plunger in posltion for ready removal from the press by'hand or otherwise.
The safety device will now return to its 5 normal position and prevent the desce'ntof the pressure head until both control levers are again operated. I
The operation of the steam' cylinder'with the cushioning devices havingbeen previously described, its operation in connection with the manufacture of anchor blocks or in connection with repressing blocks will be sufficiently" obvious; i
It is'to be understood that the invention may be variously modified and embodied within the scope of'the 'subjoined claims.
I claim as my invention:
1. In a-press of the character described, thecombmation of clamping means initially" of a semi-plastic paving block for partially embedding an anchor in the face of the block, and relatively movable clamping elements for supporting the sides of the block against cracking or distortion during the anchor embedding movement of said anchor carrying element.
3. In a press of the character described, the combination offa pressure plate providing means for positioning an anchor thereon, relatively movable clamping elements for supporting the sides of a semi-plastic paving block, and pressure means for moving said pressure plate'toward the paving block while held in clamped position partially to force" the anchor into a face of the block and to apply pressure to said face ofthe block at the conclusion of the anchor embedding operation.
4. In a press of the character described, the combination of a pressure head, means thereon to releasably engage an anchor member, means to position a paving block in operative relation to the pressure head, means initially to apply ressure to the sides of the paving block, and means subsequently partially to embed the anchor member in the paving block While maintaining side pres sure thereon.-
5. I11 a press of the character described, the combination of a pressure head, means thereon to releasably engage an anchor member, means to position a paving block in operative relation to the pressure head, means initially to apply pressure to the sides of the paving block, means subsequently partially to embed the anchor member in the paving block While maintaining side pressure thereon, and means to apply pressure to the top and bottom of the paving block after embedding the anchor member therein.
6. A press comprising, in combination, block-holding means for supporting the four sides and bottom of a completed compressed block While initially applying pressure to both sides, and a presser head for subsequently pressing an anchor member predetermined distances into the top of the paving block While maintaining side pressure.
7. In a press of the character described, the combination of a pressure plate having a recessed portion for positioning an anchor thereon With a portion of the anchor behind the pressing face of the plate and a portion thereof projecting therefrom, relatively movable clamping elements for supporting the sides of a semi-plastic paving block, and pressure means for moving said pressure plate toward the paving block While held in clamped position partially to force the anchor into a face of the block and to apply pressure to said face of the block at the conclusion of the anchor embedding operation.
In testimony whereof, I have signed my name to this specification this 12th day of July, 1916.
GEORGE P. HEMSTREET.
Gupies of this patent may be obtained for five cents each, by addressing the Commissioner of Iatents,
Washington, D. G.
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US5071607 *||Jan 31, 1990||Dec 10, 1991||Alza Corporatino||Method and apparatus for forming a hole in a drug dispensing device|
|U.S. Classification||425/352, 192/131.00R|