US2022666A - Variable speed tension impact machine - Google Patents

Description

Dec. 3, 1935. R. K. HASKELL ET AL 2,022,566

VARIABLE SPEED TENSION IMPACT MACHINE Filed Oct. 2, 1935 2 Shets-Sheet 1 V Invanturs Rmh rt Kfiaskell Hamld13-Mann EY WW 1366- 1935. R. K. HASKELL Er AL VARIABLE SPEED TENSION IMPACT MACHINE 2 Sheets-Sheet 2 Filed 001:. 2, 1955 Inventurs Rnbart. Kl-Iaskell Harald [3-Mann Attnrne'y Patented Dec. 3, 1935 PATENT oFFICE VARIABLE SPEED TENSION IMPACT MACHINE Robert K. Haskell, United States Army, and Harold 0. Mann, both of Watertown, Mass.

Application October 2, 1933, Serial No. 691,826

3 Claims.

(Granted under the act of March amended April 30, 1928; 370 0. G. 757) The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to us of any royalty thereon.

The subject of this invention is a variable speed tension impact machine for testing material to the breaking point by tension impact.

The main objects of the invention are the provision of a device in which the speed of the impact member at the time of impact may be predetermined; and the provision of means for measuring the energy absorbed by the test specimen on impact.

To these and other ends, the invention consists in the construction, arrangement and combination of elements described hereinafter and pointed out in the claims forming a part of this specification.

Practical embodiments of the invention are shown in the accompanying drawings wherein:

Fig. 1 is a view in elevation, partly in section, of a machine constructed in accordance with the invention.

Fig. 2 is a sectional view taken on the line 22 of Fi 1.

Fig. 3 is an end elevation.

Fig. 4 is a schematic .view in elevation of a .modified form of the machine.

Fig. 5 is a fragmentary detail in elevation of the pendulum. I

Fig. 6 is a sectional view on the line 6-6 of Fig. 5.

Fig. 7 is a view in elevation partly" in section of another modified form of the machine.

Fig. 8 is a fragmentary detail in elevation of the pendulum.

Fig. 9 is a sectional view on the line 99 of Fig. 8.

Referring to the drawings by numerals of reference:

There is provided a suitable supporting frame I in which a shaft 2 is journaled' carrying preferably fast thereon, a rotatable element 3 herein shown as a disk formed with segmental peripheral flanges 4. Rotation may be imparted to the element 3 through any desired means as for instance a motor 5.

Pivotally mounted on the rotatable element and occupying the diametrically opposite spaces between the ends of the flanges 4 are an impact member 6 and a counter weight I respectively. To permit retraction of the counterweight and impact member,'a disk 8 is loosely mounted on the shaft 2 and is connected through links 9 and I with the impact member and counterweight respectively. Means are provided for holding the impact member and counterweight in retracted position herein shownas a latch ll carried by the element 3 and adapted to engage a notch l2 in the disk when the disk has been ro- 5 tated to position to retract the impact member and counterweight. The latch may be released by the operator in any desired manner when the element 3 has attained the proper speed, the method herein illustrated consisting of a cam surface l3 movable as by the lever 13a on the support to position to contact the stud M on the latch and release the latch.

The impact member when in extended position rests against a face of the flange 4 so as to be 15 supported firmly when delivering a blow and the counterweight is likewise supported, when extended by a face of the flange to prevent movement of the parts beyond a fixed position.

Mounted in the support for oscillation out 20 a shaft I5 is a pendulum l6 formed with-anoffset portion adjacent to the rotatable elementato provide a downwardly facing shoulder ll drilled and tapped to receive an end of a test specimen l8 to the other end of, which is secured a tup 25 I9 extending laterallyof the pendulum in position to be struck by-the impact member when in extended position.

Mounted on the shaft I5 adjacent to the pendulum is a pointer 20 which is rotatable on the shaft and has sufficient frictional contact therewith to remain stationary at any position to which it may be moved until a force other than the action of gravity upon the pointer is applied to move it. A pin 2| projecting from the pendulum contacts the pointer when the pointer is at zero setting and the pendulum is at rest. A scale 22 is supported in position to register with the pointer. In order that the tup and test specimen may be recovered easily after the specimen is broken, a base 23 maybe provided and partially filled with sandijior like material for receiving the tup and portion of the test specimen upon reception of the latter.

The operation of the device is as follows:

A test specimen is threaded into the pendulum and the tup. With the impact member and dulum. The greatest oscillation of the pendulum is indicated by the pointer which is carried up the scale by the pendulum, but because of its frictional contact with the shaft, does not return from such position. In order that the pendulum may not swing back and injure the box 23, a brake, not shown, may be applied to check the return swing. f

The modified form shown in Fig. 4, is the same as that heretofore described with the exception that the position of the pendulum has been changed necessitating a slight-modification in the form of the pendulum.

In this instance the shaft I5 is so placed that the lower end of the pendulum is adjacent to the rotatable element 3 and such end is bifurcated as at 24 to permit the passage of the periphery of the element 3. Within the bifurcated portion is the rib 25 which is drilled and tapped to receive the end of a test specimen to the other end of which is secured the tup as heretofore described.

In the modified form shown in Figs. '7, 8 and 9 the rotatable element 3 and pendulum are mounted on the same shaft. In this instance the pendulum 26 is bifurcated to straddle the element 3 and a rib 21 is formed at its lower connected end which rib is drilled and tapped to receive the test specimen as heretofore described.

We claim. 1. A variable speed tension impact machine embodying, a rotatable element, retractable impact members carried by said element, retractable counterweights carried by said element, a connection betwen the impact members and the counterweights operable to retract the same, releasable means for holding the members and 5 counterweights retracted, means for releasing said holding means when a predetermined speed has been attained by the element, and means for registering the energy absorbed on impact.

2. A variable speed tension impact machine 10 embodying a rotatable element, retractable impact members carried by said element, a plate rotatable with the element and rotatable with respect thereto, a connection between the plate and the impact member for retracting the same, means for locking the plate to the element to hold the impact members retracted, means for releasing the locking means, a pendulum adjacent to' the rotatableelement, means for securing a specimen to be ruptured to the pendulum, and means for indicating the force of impact through the swing of the pendulum. v

3. A variable speed impact machine embodying a rotatable element, retractable impact members carried by said element, releasable means for holding the members retracted, a pendulum adjacent to the rotatable element, means for securing a speciman to be ruptured to the pendulum, and means for indicating the force of impact through the swing of the pendulum.

ROBERT K. HASKELL. nanom c. MANN.

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