US623175A

US623175A - Attachment for trestles

Info

Publication number: US623175A
Authority: US
Publication date: 1899-04-18
Anticipated expiration: 1916-04-18

Description

No. 623,!75. Patented Apr. l8, I899.

G. E. PALMER. ATTACHMENT FOR TRESTLES.

(Application filed Feb. 15, 1898 T 2 Sheets-Sheet I.

(No Model.)

UNITED STATES PATENT OFFICE.

GEORGE E. PALMER, OF CEDAR RAPIDS," IOiVA.

ATTACHMENT FOR TRESTLES.

SPECIFICATION forming part of Letters Patent NO. 623,175, dated April 18, 1899.

Application filed February 15, l89 8. Serial No. 670,445. (No model.)

To all whom, it may concern:

Be it known that I,- GEORGE E. PALMER, a citizen of the United States, residing at Cedar Rapids, in the county of Linn and State of Iowa, have invented certain new-and useful Improvements in Attachments for Trestles; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

The object of this invention is to provide a carpenters trestle with an attachment whereby work may beheld for planing and the like; and the invention consists in an attachable and adjustable device for this purpose, such as will be hereinafter fully set forth and claimed, reference being had to the accompanying drawings, in which- Figure l is a View in perspective of a device embodying my invention as applied to one end of a trestle in a position to hold work on top thereof. Fig. 2 is a similar View representing the device in a position to hold work at the end of the trestle. Fig.8 is a sectional view, the section being taken longitudinal to the trestle and in the plane of the middle of the serrated dog. Fig. 4, Sheet 2, is a view in perspective showing a device for holding work at an angle. Fig. 5 is a view of the dog from the opposite side, also showing the angle attachment.

Similar letters of reference indicate corresponding parts.

In carpentry it often becomes necessary to use a trestle or a pair of them instead of a bench, and in such case itis necessary to provide some means for holding boards on'edge in dressing and jointing them. So, also,in the fitting of doors, window-sash, and the like, where the work is placed on the floor, it is desirable to have them held firmly in a vertical position. This device is designed to facilitate operations of this kind, and the apparatus by which the results are attained will now be described.

In the drawings, A denotes a trestle of the ordinary type.

B is an angular plate, preferably of stiff sheet-steel,bent to practically the stirrup form shown, with a lateral wing or flange 13 projecting outwardly from one of the sides of the stirrup. The angle-plate is provided with suitable holes B and B to take a screw or bolt 0, by means of which it is secured to the end of the trestle in either of the positions shown in Figs. 1 and 2. In the latter position the end of the trestle abuts against the side of the stirrup, as shown, and prevents any turning of the angle-plate on the single bolt by which it is attached to the trestle. Then in the position shown in Fig. 1, the end of the trestle could not well be made to abut against the transverse portion of the stirrup without cutting gains in the end of the trestle to receive the dog and screw-post. To admit of the angle-plate being held rigidly in position with a single bolt, therefore, shoulders B are formed on the inside of the stirrup a little back from the dog and post to serve as abutments for the end of the trestle. These may be formed in any desired manner, a

simple and eflicient construction being shown in the drawings, where the holes B and B are represented as punched out on three sides, and the part so punched out is bent down on the fourth side to form these shoulders. In case a malleable casting were used for the angle-plate the shoulder would of course be in the nature of a lug cast integral with the body of the stirrup. In the opposite sides of the angle-plate are holes B and B to take the screw-post and dog, respectively. The former is provided at its upper end with a screw D, having a swiveled bearing-plate D at one end and a suitable sliding bar D in the head D at the other end. Laterally opposite this post in the hole B is placed a dog E, having a suitable serrated lip E to engage the end of a piece of work to be planed. The sides of the dog are made plane and parallel, the side facing the screw serving as one jaw of a vise, as will be readily seen. In practice the dog is channeled on the front side, as shown in Fig. 3, the object being not only to reduce weight and cost, but to provide an opening through which the dirt and chips which naturally collect under a benchdog may fall through.

Both the screw-post and dog are held at any desired elevation with respect to the angleplate by springs F pressing against one of their smooth faces. Only the spring for the dog is illustrated; but it is to be understood 'work inclined.

entirely removed.

In the position shown in Fig. 2 the device -is very useful for holding doors,window-sash,

and the like on the floor edge up, the trestle being of course fastened to the floor.

In Figs. 4 and 5 is shown an attachment E for the dog for the purpose of holding the This is a simple abutment having an angular head to bear on one side of the work and a shank E fitting holes E in the sides of the dog. To prevent turning, the shank is preferably made oblong in crosssection, and the better to enable it to keep its place in the dog the shank passes through it at an angle, the head being relatively higher than the other end. The work is heldas plainly shown in Fig. 4, the pressure of the vise-screwbeing applied midway between the bearing-points of the work on the dog. By raising or lowering the dog and correspondingly the screw-post the angle of the-work may be varied at will.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination of an angle-plate adapted to be attached to a trestle, and having holes to receive a dog and a screw-post, and friction-springs adjacent to said holes a dog having a suitable holding-lip, with plane, parallel sides fitting one of the holes in the angleplate, and a screw-post provided with a visescrew, which post is fitted to and adapted to slide up and down in ahole opposite said dog, substantially as and for the purpose set forth.

' 2. The combination of a stirrup-shaped angle-plate having a laterally-projecting flange,

whereby it is adapted to be attached to a trestle in positions at right angles to each other, and having dog and screw-post holes through the sides of the stirrup portion, a parallel-sided dog fitting one of said holes and adapted to slide therein, and a screw-post provided with a vise-screw, fitting and adapted to slide in the other holes, opposite said dog, and springs to hold said dog and post in any desired position by friction, as described.

3. The combinationof an angle-plate of substantially the stirrup form shown, with a lateral wing or flange at right angles to the sides of said stirrup, said angle-plate being provided with holes for a retaining-bolt and shoulders to prevent its twisting when in position, holes in the stirrup portion to take a dog and a vise-screw post, a parallel-sided dog and vise-screw post fitting said holes, respectively, and adjacent springs adapted to hold said dog and post in any desired position by friction, substantially as described.

4. The combination with a supporting angle-plate and a dog and vise-screw post mounted 'adjustably therein, of a removable lateral abutment attached to the dog, substantially as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

- GEORGE E. PALMER.

' YVitnesses:

J. M. ST. JOHN, J. .F; GRoAT.