US2519308A

US2519308A - Portable bucking tool

Info

Publication number: US2519308A
Application number: US581863A
Authority: US
Inventors: Brown Morris
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-03-09
Filing date: 1945-03-09
Publication date: 1950-08-15
Anticipated expiration: 1967-08-15

Description

Patented Aug. 15, 1950 UNITED STATES PATENT OFFICE PORTABLE BUCKING TOOL Morris Brown, San Diego, Calif. Application March 9, 1945, Serial No. 581,863 2 Claims. (Cl. 1S-53.5)

The invention relates to portable bucking tools for riveting through a power hammer which imparts blows to rivets engaging the tool.

The several objects of the invention are to provide a bucking tool: which is light in weight to reduce fatigue of the operator and adapted for bucking heavy rivets; which comprises an elastic casing which functions to deaden sound and reduce the shock transmitted to the operator; in which the elastic casing also functions to damp the hammer imparted strokes to the bucking-head; for increasing the reactive strokes imparted to the head by the spring pressed anvil; which includes a simple and quickly detachable connection between the stem of the bucking-head and tube in which it is slidable for attaching bucking-heads of diiierent shapes for use in different types of riveting or for rivets of different shapes and sizes; and other objects which will appear from the detail description.

The invention consists in the several novel features which are hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the drawings:

Fig. 1 is a longitudinal section of a tool embodying the invention, parts being shown in elevation.

Fig. 2 is a section taken on line 2-2 of Fig. l.

Fig. 3 is a perspective of a bucking-head.

Fig. 4 is a detail perspective of the tube in which the stem of the bucking-head is slidable and in which the anvil is conned.

Fig. 5 is a longitudinal section of a modified form of the invention, parts being shown in elevation.

Fig. 6 is a perspective of the shown in Fig. 5.

Fig. '1 is a perspective of the tube shown in Fig. 5. a

Fig. 8 is a section taken on line 8--8 of Fig. 5.

The invention is exemplified in a bucking tool which comprises a metal tube I0, the bore of which is cylindrical; a bucking-head II provided with a cylindrical stem I2 which lits into, is slidable in one end portion of the tube IIJ; and is provided with a longitudinally extending groove; an instruck resilient tongue I5 on the tube III which is adapted to extend and fit into the groove I4 in the stem and slidably retain the head I I in connected relation, and against rotation relatively, tg the tube I0; cylindrical anvil I6 slidably iitting in the tube I0; a spring I1 acting on the anvil I6 to impart counter-blows to the head II reactively to the impact blows from the hamretaining member gaged by spring I1.

mer; and a casing I9 formed of elastic material, such as rubber which fits snugly around the outer periphery of tube I0 and is provided with a closed end 20 lthe inner face of which is en- The tongue I5 and groove I4 are shaped to permit the stem I2 to be inserted into the tube I0, so the tongue will snap into groove I4 and predeterminedly limit the outward movement of the anvil I6 by its spring I1, when the stem I2 is withdrawn from tube I0, and to adapt the stem I2 to be slidable inwardly from the impact blows derived from the hammer through the rivets. The tongue I5 fits in and extends across the groove I4 so the tube and stem will be relatively non-rotatable. This exempliiies a simple construction for quickly and interchangeably connecting bucking-heads of different shapes which are adapted for different forms of riveting or riveting rivets of different shapes and sizes. The tongue I5 normally arrests the outward movement of the stem I2 by the springpressed anvil IB, the spring I1 being under compression when the bucking head Il is connected to the tube I0. The tongue is also adapted to be cammed out of groove I4, when preponderating force is applied to the head for its removal from the tube, and the inner end of the stem is adapted to spring the tongue outwardly when the stem is forced into the tube. This exemplifies a snapconnection for easily and quickly and interchangeably connecting bucking-heads for different kinds of work, to the tube containing the spring-pressed anvil.

The tube I0 terminates inwardly from the end of the elastic casing I9 adjacent the head II and a washer 22 of metal surrounds stem I2 between said end of casing I9 and a shoulder 23 on the head II. The impact blows imparted from the hammer through the rivets to the head II, cause the shoulder 23 to engage the washer 22 and the latter to engage the contiguous end of the elastic casing I9. This damps the inward movement of the head I I resulting from the impact blows imparted to the head, and causes the spring-pressed anvil to rebound from, and impart'more effective counter-blows to the stem l2 on head I I. This accelerates the upsetting of the rivets and effects a saving of time in riveting operations. The masses in the head and in the anvil, and the force of spring I1 are co-related so as to tend to synchronize the hammer blows and the counter-blows.

The elastic casing I9 which is gripped by the operator in bucking the rivets, suppresses or deadens the noise or sound resulting from the impact and counter-blows and also cushions these blows, to lessen fatigue and shock in the use of the tool. The casing I9 may have its outer periphery annularly gooved, as at 24, for rm gripping in the hands of the user.

The operation of the bucking tool is as follows: the user will insert into the open end of tube In the stem I2 of a bucking tool having a face shaped for the particular class of riveting desired, the tongue I5 will snap into groove I4 and slida-bly and non-rotatably hold the head II in operative relation with the tube I and-casing I9. This construction greatly facilitates interchange of heads for different classes of riveting. The operator, gripping the casing I9, Will hold the outer face of head II against a rivet which has been inserted through the Work to be riveted. Hammer blows Will be imparted to the rivet by another operator, which will be transmitted through the rivets to the head I I, for upsetting the inner end of the rivets. These blows will be transmitted by the head I I to the anvil I6, causing the latter to rebound from the stem I2 against the force of spring I'I. The spring will cause the anvil to reactively impart Outward blows to the head. During the inward strokes of the head, shoulder 23 will engage washer 22, which will compress the inner end of elastic casing I9 to ldamp the vibrations of the head, for rendering the counter-blows on the stem from the anvil more effective and for accelerating the riveting operations. During these riveting operations the noise produced will be deadened or suppressed by the elastic casing which will also reduce transmission of the vibrations in the tube IIJ resulting from the impact and counterblows. This greatly reduces fatigue of the operator.

In the modication of the invention illustrated in Figs. 5 to 8, the tube I0', is provided with a longitudinal slot 26, the stem I2 of the buckinghead II is provided with a groove I4', and a retaining member 2'I extends through slot 26 into and yieldingly held in groove I 4 by the elastic casing I9', and is provided with abutments 28 which engage the tube I0 at the ends of slot 26 for retaining the member' 21 in the tube when the stem I2 is withdrawn from the tube. This exemplifies a snap connection for the tube and stem in which the retaining member is yieldingly held in the stem by the elastic casing. A cap 30 is secured by a pin 3l in the outer end of tube I0', and functions as a closure for said end of the tube and as an abutment for the spring I1 which presses against the anvil I6. The outer end of the elastic casing I9' terminates at the cap 30. The inner end of the casing I9' extends beyond the inner end of the tube I0' for the purpose before described. The operation of this modified form of the invention is similar to the operation of the other construction.

The invention exemplies a portable bucking tool which comprises an elastic casing which reduces the fatigue of the operator; is light in weight; is adapted for comparatively heavy work; accelerates the riveting operations; a snap connection between the tube and the buckinghead which permits easy and quick interchange of heads for diierent kinds of work; reduces the 4 noise incident to the riveting operations; and is simple in construction and e'cient in operation.

The invention is not to be understood as restricted t0 the details set forth since these may be modified within the scope of the appended claims without departing from the spirit and scope of the invention.

Having thus described the invention. what I claim as new and desire to secure by Letters Patent is:

1. A portable bucking tool for co-acting with a power-hammer, comprising: a tubular member open at its inner end, a bucking head provided with a face for engaging a rivet and receiving impact blows from the hammer to the rivet, and with a stem slidably mounted in the tubular member, an anvil for the stem confined in the tubular member, a spring at the inner end of the tubular member acting on said anvil, means for slidably retaining the stem in the tubular member, and a tubular casing of sound-deadening material around and jacketing the tubular member substantially throughout its entire length, forming a supporting grip for manipulating the tool and having an integral end-portion forming a seat for said spring.

2. A portable bucking tool for co-acting with a power-hammer, comprising a tubular member, a bucking head provided with `a face for engaging a. rivet and receiving impact blows from the hammer to the rivet, and with a stem having a. longitudinal groove in its periphery slidably mounted in the tubular member, a spring-pressed anvil for the stem conned in the tubular member, the tubular member having a portion with slot and an integral resilient instruck tongue extending into said groove for slidably retaining the stem in the tubular member, and a tubular casing of rubber tting around and jacketing the tubular member substantially throughout its length, forming a cover for the slot and forming a resilient grip for manipulating the tool, the casing being extended around said tongue.

MORRIS BROWN.

REFERENCES CITED The following references are of record in th le of this patent:

UNITED STATES PATENTS Sweden Apr'. 23, 1940