US 1951093 A
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March 13, 1934. H, M JOHNSTON 1,951,093
COUNTERS INKING MACHINE Filed April 9, 1932 `2 Sheets-Sheet 1 March 13, 1934. v H, M, JQHNSTON 1,951,093
k coUNTERsINK'ING MACHINE Filed April 9, 1952 2 Sheets-Sheet 2 [men/for;
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Patented Mar. 13, 1934 UNITED STATES COUNTERSINKING MACHINE Harry M. Johnston, McKeesport, Pa., assignor to National Tube Company, a corporation of New Jersey Application April 9, 1932, serial No. 604,305
This invention is a machine particularly in-I,
engage the ends of the levers 7 so as to reciprotended to countersink the ends of couplings, al-f cate the spindles 3 together during the period though it may be used for other purposes, one of the objects being to construct it to receive a number of units of work and automatically drill or countersink both ends of each in rapid succession. Other objects may be understood from the following.
Having reference to the accompanying drawings which illustrate a specific form of the invention:
Figure 1 is an enlarged detailed front elevation.
Figure 2 is a cross-section from the line II-II in Figure 1.
Figure 3 is a fragmentary top plan looking down from the line III- III in Figure 2.
This machine consists of a base or frame 1 which at each end mounts electric motors 2 driving alined opposed spindles 3. These spindles are on shafts 4 which are reciprocably mounted in housings 5, this necessitating splined connections 6 somewhere between thes shafts and the fixed parts connecting them to the motor 2. Pivoted levers 7 are connected to the spindles 3 so that when their ends are moved the spindles will likewise be moved. These levers have rollers on their ends.
rVise jaws 9 and 10 are between the reciprocable spindles 3 and a retractable stop 11 is directly beneath these.V A guideway 12 is arranged to feed couplings 13 vertically downward between the vise jaws and by the stop 1l. Both the vise jaws 10 and the stop 11 are urged to coupling engaging position by plungers 14 which fit a chamber 15 in which a constant air pressure is maintained. Cross-heads 16, extend from either side of the outer ends of the plungers 14 and push-rods 17 extend backwardly from both ends of these to other cross-heads 18. These other cross-heads are engaged by pivoted rocker-arms 19 and 20 so that when the ends of these rocker-arms are pushed forwardly the push-rods 17 will be drawn backwardly and the vise jaw 10 released and the stop 1l retracted.
The levers 7 and the rocker-arms 19 and 20 are operated by a set of cams 21, 22 and 23, all mounted on a shaft 24 driven by an electric motor 25 through a gear reduction unit 26.
The retractable stop 11 is arranged so that when it stops the passage of one of the couplings 13 the next coupling above will be stopped between the vice jaws 9 and 10. Therefore, by retracting the stop 1l only when the jaw 10 is engaging one of the couplings and by releasing the jaw 10 only when the stop is forward it is possible to feed the couplings one at a time.
To accomplish the above the cams 22 and 23 have thei'` operating surfaces cut to cause alternate operation of the rocker-arms 19 and 20 and the cam 21 has double operating surfaces which that the jaw 10 is in holding position, these ends being constantly urged against this cam by plungers 27 arranged to enter chambers 28 in which a constant air pressure is maintained.
Assuming that the guideway 12 is lled with couplings 13, that proper countersinking tools 29 'are mounted in the spindles 3 and that al1 the motors are running', the operation of the machine is as follows.
One of the couplings is held by the vise jaws 9 and 10 while the tools 29 are rapidly moved into and out of its ends by the action of the cam 21. The cam 23 now forces the jaw 10 to release the coupling whose ends have just been countersunk, it dropping to the stop 11 and allowing the next coupling to come between the two vise jaws, and then release the jaw l0 so that it is pushed against this next coupling by its plunger 14. The cam 21 again causes reciprocation of the tools 29 and, while this reciprocation is going on, the cam 22 retracts the stop 11 so that the previously countersunk coupling can drop from the machine.
Preferably the guideway r12 is fed with the couplings by a trough 30 and, as the couplings are not always accurately cut to the same length, this may be constructed so that its upstanding edges form a gage whereby, should the coupling t the trough, it will be certain to t the guideway 12. This will avoid any jamming of the couplings in the guideway 12 which would necessitate the machines shutdown.
Although a specific form of this invention has been shown and described in accordance with the patent statutes, it is not intended to limit its scope exactly thereto, except as dened by the following.
A machine including reciprocable spindles, xed and retractable vise jaws between said spindles, a vertical guideway arranged to feed units of work to said vise jaws, a retractable stop arranged beneath said vise jaws so that when one of said units is stopped thereby the next unit will be positioned between the vise jaws, said retractable vise jaw and said retractable stop being arranged for parallel movement, plungers connected to said retractable vise jaw and stop and with their ends positioned in a chamber containing compressed air so as to be reslliently urged outwardly thereby, means for alternately forcing said retractable vise jaw and stop from unit-engaging positions and means for reciprocating said spindles together when said vise jaw is in its unit-engaging position.
HARRY M. JOHNSTON.