US777476A - Locking device for rivet-seats. - Google Patents

Description

PATENTED DEC. 13, 1904.

W. 0. LIPPERT. LOOKING DEVICE FOR RIVET SETS.

APPLIOATION FIIED NOV. 11 1903. N0 MODEL.

wwmw ww m UN Tnn STATES Patented December 13, 190&.

PATENT OFFICE.

WILLIAM C. LIPPERT, OF SALEM, OHIO, ASSIGNOR OF ONE-THIRD TO WILLIAM A.

MCGUIRE, OF BRADDOOK,

PENN SYL VANIA.

LOCKING DEVlCE FOR RlVET-SETS.

dated December 13, 1904.

Application filed November 11, 1903. Serial No. 180,708- (No model.)

To all whom it may concern:

Be it known that I, WILLIAM C. LIPPERT, a citizen of the United States of America, residing at Salem, in the county of Oolumbiana and State of Ohio, have invented certain new and useful Improvements in Looking Devices for Rivet-Sets and Li ke Tools, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to certain new and useful improvements in looking devices for rivet-sets and like tools; and the invention is particularly designed for and adapted to be used for the securing or locking in position of the rivet-set in the end of a pneumatic hammersleeve or for the securing of other equivalent tool to the rivet-set in position.

In the use of pneumatic hammers the rivetset,sometimes termed a button and also quite generally termed in the trade the snap, works or reciprocates freely in the end of the cylinder of the hammer, it being held when the hammer is in use against displacement under the pressure of the air by reason of its being placed in engagement with the rivet being operated upon. It frequently happens, however, that the air pressure is inadvertently or accidentally turned into the cylinder when the rivet-set is not in position with the work, and consequently the plunger in the cylinder, moving forward under air-pressure, strikes the inner end of the rivet-set and forces the rivetset out of its socket in the end of the sleeve or cylinder with great force and endangeringthe safety, if not the life, of workmen in the vicinity. The rivet-set in this class of tools must of necessity reciprocatein the end of the sleeve or cylinder in order that after each blow of the piston or plunger in the cylinder the rivet-setmay recede to receive the succeeding impact of the piston or plunger to effect the heading of the rivet.

It is the object of my invention, therefore, to provide means for permitting the free reciprocation of the rivet-set as required, but to so secure the rivet-set in the end of the barrel or sleeve that in event of the plunger or piston being driven forward when the rivetset is not in engagement with a rivet or other object to receive the force of the blow the rivet-set will be retained in the end of the cylinder and no damage will be done.

In describing my invention in detail reference will be had to the accompanying drawings, forming a part of this ap ilication, and wherein like numerals of reference will be employed for designating-like parts throughout the different views of the drawings, in which- Figure l is a side elevation of a pneumatic hammer, partially in longitudinal section,illus trating one form of my invention. Fig. 9. is a transverse vertical sectional view taken on line 2 2 of Fig. 1. Fig. 3 a longitudinal sectional view of a cl1iselsleeve employed to receive the rivet-set or other toolin some forms of pneumatic hammers. Fig. at is a longitudinal sectional view of a part of a hammer em ploying the chisel-sleeve construction, showing the adaptation of my invention thereto. Fig. 5 is a view of means for locking the pin.

In the accompanying illustration of my invention I have shown the same in connection with the holding of a rivet-set, button, or snap as the tool beingheld; but 1 do not wish to be understood as confining myself to the adaptation of the invention to the holding of this form of tool alone, as the invention is equally applicable to the holding of other tools employed in pneumatic hammers and like devices. .lrl aving used the rivet-set or button for illustrativepurposes, I will describe the same in detail.

In the accompanying drawings, 1 indicates the cylinder of the pneumatic hammer, the nose 2 of which is in practice bored longitudinally to receive the shank or stem 3 of the rivet-set or button 4:, the inner end of the stem or shank 3 being adapted to receive the impact of the piston or plunger Where the shank or stem of the rivet-set or button is fitted direct into the bore in the end of thecylinder or sleeve 1, as shown in Fig. l, I provide the nose end of the sleeve or cylinder with an inn, terror annular groove b, so disposed w1th1n the nose end of the sleeve or cylinder as to g beyond the periphery leave bearings 7 8 at each side of the groove 6 for the shank or stem. I then provide the shank or stem 3 with a recess-cavity 9, in which is placed a coil-spring 10 of desired strength, and dispose in the cavity or recess on top of the spring a pin 11, which projects of the shank of stem 3 and works in the annular groove 6, the latter being made of sufficient width to allow of the full reciprocation or stroke of the rivet-set or button. In case it is desired to remove the rivet-set or button (or other tool) an instrument, such as a small nail, may be inserted through an aperture 12, provided in the nose end of the sleeve or cylinder and engaged with the pin 11 to depress the latter and compress spring lO, whereby to permit the removal of the tool, as will be apparent.

It is sometimes the practice to employ a chisel-sleeve or bearing-sleeve in the nose end of the sleeve or cylinder, in which sleeve the shank of the tool reciprocates, and the adaptation of my invention to this form of tool is shown in Figs. 3 and 4. In this construction I provide the chisel-sleeve or bearing-sleeve 14 with a grooved-out portion 15 at its inner end, which grooved-out portion receives the locking-pin 11, that is mounted in the shank or stem in the same manner as aforedescribed. The opening 12 in the nose end of the sleeve or cylinder in this construction is also extended through the sleeve 14, as shown in Figs. 3 and L. In order to prevent the pin from falling out of this socket when the rivet-set or other tool is removed from the hammer, I provide a lock for the pin of suitable construction, a practical embodiment of which is to provide the pin with a stud 10 to engage in a bayonet-shaped slot 11, so constructed as to allow for the vertical reciprocation of the locking-pin as may be required.

In either of the constructions shown and described it will be apparent that the principle involved is identical and that while the free required reciprocation of the shank of the tool is provided for yet the tool will be securely locked against being driven out of the hammer in event of its not being in engagement with the work when the piston or plunger strikes the same and all danger or injury to the workmen obviated.

While I have described in detail and illustrated adaptations of the invention, yet I do not wish to unduly confine myself in construction. as it will be evident that various changes may be made in the details of construction as may be required according to the tool to be held without departing from the general spirit of the invention.

Having fully described my invention, What I claim as new, and desire to secure by Letters Patent, is

The combination with the grooved cylinder and the tool-shank bearing therein, said shank having a recess formed therein, a locking-pin insaid recess, a spring seating in the recessbottom and bearing against the pin, the cylinder having an aperture therein whereby access may be gained to said pin to depress the same by use of some instrument or the like capable of entering said cylinder-aperture.

In testimony whereoi'I afiiX my signature in the presence of two witnesses.

WILLIAM C. LIPPERT.

Witnesses E. H. HU'IZEN, J. A. LIPPERT.

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