US1419293A

US1419293A - Sound-muffling pad for typewriting machines

Info

Publication number: US1419293A
Application number: US494319A
Authority: US
Inventors: Lewis C Myers
Original assignee: Royal Typewriter Co Inc
Current assignee: Royal Typewriter Co Inc
Priority date: 1921-08-22
Filing date: 1921-08-22
Publication date: 1922-06-13
Anticipated expiration: 1939-06-13

Description

I L. c. MYERS. SOUND MUFFLING PAD FOR TYPEWRITING MACHINE APPLICATION FILED AUG.22

Patented June 13,1922.

,. To all whom it may concern:

. UNITED STATES:

PATENT O ICE.

LEWIS o. MYERS, or BROOKLYNQNEW YORK, ASSIGNOR TO ROYAL 'IYPEWRITER COMPANY, me, or NEW YORK, N. Y., A CORPORATION or NEW Y RK.

souND-murrLINe ran Fort rirnwmrme M'AcmNEs.

, 'Be it known that 1,.LEWIS CJMYERS, a

\ citizen of the United States, residin -in illustrated in Figsul and,2.

Brooklyn, in the county of Kings and tate of New York, have invented certain new and useful Improvements in Sound- Muflling Pads for Typewriting Machines, of which the following is a specification.

The object of this invention is to provide means for absorbing shocks and mufltling or deadening sounds produced by a typewriting machine while in operation which sounds are, as a rule, transmitted to the desk or table on which the machine is supported and areby such support increased to a very large extent. .These sounds are largely produced by the shifting for upper and lower case printing and are responsible for a large part of the noise produced inthe operation of the machine.

According to my invention I provide a.

pad, mat or cushion which is preferably made of such size as to extend entirely across the rear part of the machine behind the key-board, and it is constructed of relatively soft, sound-mufiling material reinforced or stiffened with comparatively rigid material. with means for attaching it'to the frame of the machine, and preferably it is equipped with devices for securing it to a desk or table top on which the machine is supported.

. My improvements are illustrated in the accompanying drawings, in which- 35 Figure 1 1s a side, view of-apart of the frameof a typewriting machine to which the pad is attached, and itgalso shows part ferred form of pad, with parts broken away to show details of construction. Figure 3 is a view in sectionof the pad Figure 4 is a plan view of the pad. showin how'its edges are preferably'formed. Figure 5 is a'plan'view of one form of stiffening layer that maybe used. r Figure 6 "1s a plan view of 'anoth'erform of stifi'eningiayer which may be employed. A part of-the side of the frame of a Royal typewriting machine is indicated at A. This frameis formed with? feet (a-as usual, and

it will be observed that these feet extend for only a short distance below theedges of Preferably the pad is provided Specification of Letters Patent. Patented June 13, 1922.

- Application filed August 22, 1921. Serial 1T0 484,819. I

the main frame. Usually individual pads are attached to these feet, but according to my invention these individual pads are discarded and the universal pad illustrated is employed. The pad as a whole extends under the entire rear part of the machine where a large part of the noise-produclng mechanism is located.

As shown in- Fig. 1, the pad is secured to i support T and the frame of the machine through which noises could pass and as is well known inthe Royal machine panels A'- of glass are employed and. thus thereare no side-openings in the frame. ,7

The details of construction of the pad shown are of importance. The pad embodies in its constructionsoft material, suchas felt, which is a good sound deadener or muffler, and means for stiffening it and holding it in a fiat condition,"such stifi'ening means. also serving in attaching the pad securely to the machine and to the support.

. In the preferred construction a layer of stiffening material, such as wood veneer or metal, is interposed between two layers of felt or similar material. The drawings showtwo layers offelt' b, 7)", two layers of.

"v eer 0,10 and a layer of felt d interposed between the layers a, c of veneer as'this construction has been found to be serviceable andefiicient.

' A pad having the characteristics thereof or to a desk" or not. The pad will always lie flat on its support and W111 pr0perly sustain the machine.

ers ma be connected with each other by cementing. material or otherwise, if desired. When it is desirable to attach the pad to the machine I do so by screws Dwhich extend through holes in the corners of the pad, in the manner shown, and engage above 1 7 described may be used. with a typewriting .machine whether it be attached to the frame The several laytapped holes in the feet of the machine.

When it is desirable to attach the machine to 'a desk, table or other support, instead of employin metal clamps which engage the machine frame and the desk top, I employ screws or other fastening devices E which extend through the desk top and engage the pad, as shown. Preferably plates 6 are secured to one of the stiffening layers which are formed with tapped bosses 6 with which I typewriting machine of a sound muffiing the screws E engage. It will thus be seen that by attaching the pad to the machine and then attaching the pad to the desk or table there is no direct metallic connection between the machine frame and its support and therefore sounds are not freely transmitted but are muffled, i. e., are very largely eliminated. In plan the pad is referably of the shape shown in Fig. 4 and its edges are preferably serrated or pinked as in this way the edges are made more durable.

Instead of using wood veneer for the stiffenin material I may employ a sheet metal mem er C, shown in Fig. 5, and to stiffen this material it may be corrugated, as shown.

In order to reduce the weight of the stiffening material it may be perforated, as is shown in the pad D, Fig. 6.

I claim as my invent10n:

1. A sound-muffling pad, comprising a layer of sound-mufiling material, a layer of stiffening material, and devices attached to the pad for receivin means for securing the pad to a support.

2. A sound-muffiing pad, comprising a layer of sou'nd-muffling material, a layer of stiffening material, and metal plates attached to the stiffening material adapted to receive means for securing the pad to a support.

3. A sound-muffiing pad comprising a plurality of layers of sound-muffling material, an interposed layer of stiffening material, means attached to the stiffening material for receiving devices for securing the pad to a support, and means for receiving devices for securing it to a machine.

4. The combination with the frame of a pad underlying the same, and means adjustably connected to the frame and engaging the pad to force the same into firm contact with the edges of the frame between the corners thereof, thus closing the bottom of the frame.

5. A sound-muffiing pad, comprising a plurality of layers of sound-muffling' material, a plurality of layers of stiffening material, means engaging the lower layer of stiffening material to fasten the pad to a machine frame, and means engaging. the

upper layer of stiffening material to fasten -the pad to a support.

6. A sound-muffling pad, com rising a.

plurality of layers of sound-mu ing material, a plurality of layers of stiffening material, a layer of sound-muffiing material interposed therebetween, means engaging the lower layer of stiffening material to fasten the padto a machine frame, and means engaging'the upper layer of stiffening material to fasten the pad to a support.

In testimony whereof, I have hereunto subscribed my name.

' LEWIS o. MYERS.