Knob Insulators (cont'd)

Round Spit Knobs

Oval Knobs

Round Reversible Knobs

Square Reversible Split Knobs,  Square Knobs, and Misc. Knobs

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Nail Knobs Cap Designs 

Catalog pages

Patents for Knobs

Cleats

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R = round (standard diameter) nail knob (see Nail Knob Page 1)

RR = round reversible knob

O = oval

S = square or rectangular

SR = square or rectangular reversible knob

/ = marking on opposite side

// = marking on bottom

Patents for Knobs - Click on this link to see a list of all the knob patents.

Category

No.

  MARKING Marking Type Patent Company Notes
    Round Split Knobs        
R-61

 

50 emb   Davidson Porcelain Co. 1-1/2" diameter
R-143

8512 (underneath bottom) emb     1-1/2" diameter x 2"
R-60 BRUNT emb   Brunt Porcelain Co. 2" diameter
R-46 D. P. CO // 9419 emb   Davidson Porcelain Co. 1-1/2" diameter
R-20 F // F emb 464,770 Findlay Electric Porcelain Co. 1-3/8" diameter, caming groove
R-139 G. E. KNOB / PAT APLD FOR emb   General Electric Co. 1-1/2" diameter
R-22 G. E. KNOB // CAT. 6580 r-e   General Electric Co. 2" diameter
R-25 G. E. KNOB // CAT. 6580 emb   General Electric Co. 2" diameter
R-21 G. E. KNOB / PAT APLD FOR // 9352 emb   General Electric Co. 1-1/2" diameter
R-144 G. E. KNOB // 9352 r-e / emb   General Electric Co. 1-1/2" diameter x 1-1/4"
R-145 G. E. CO. // CAT / 9419 emb   General Electric Co. 1-1/2" diameter x 1-3/4"; matching vertical groove on the side
R-140

G. E. KNOB // CAT. 9420 r-e   General Electric Co. 2" diameter x 2-1/8"
R-47 G. E. KNOB // E P emb / r-e   General Electric Co. 1-1/2" diameter
R-141 G P KNOB emb   General Porcelain Co. 2" diameter x 2-1/8"; matching vertical groove on the side
R-142

 

MACOMB. emb   Illinois Electric Porcelain Co. 2-1/8" diameter x 2-1/8"
R-23 P. P. Inc. emb   Porcelain Products Inc. 2" diameter; matching vertical groove on the side
R-24 P. P. Inc. / 9420 // P. P. Inc. / 9420 emb   Porcelain Products Inc. 2" diameter; matching vertical groove on the side
R-138

US // 9420 (underneath bottom) r-e   U.S. Electric Porcelain Co. 2" diameter
    Oval Knobs        
O-01

N-N     Colonial Sign & Insulator Co. similar to patent 806,588
O-03

STAR // (embossed star) PAT DEC 5 05 r-e / emb 806,588 Star Porcelain Co.  
O-04 O-4.jpg (15569 bytes) O-4a.jpg (22966 bytes)

 

(embossed star) // (r-e star) PAT APLD FOR emb / R-E 806,588 Star Porcelain Co.  
O-02

T / PAT / 4803 / NO. 5 emb 697,001 R. Thomas & Sons Co. reversible, oval; error date, should be 4-8-02
    Round Reversible Knobs        
RR-01

.G. PAT APPD FOR (circle) emb     1-1/8" diameter; reversible
RR-09 RR-09_B-D.jpg (28844 bytes) RR-09_B-D_top.jpg (34904 bytes) B&D PAT. / AUG. 13, 95 emb 544,501 Buffinton & Dow patent (licensed) 1-1/2" diameter; reversible; cleat patent
RR-02 BUCKEYE REGD (circle) PATD 12-31-12 / F (outer circle) emb 1,048,850 Findlay Electric Porcelain Co. reversible, crossover knob
RR-06 F / PATD / 12-31 / 12 (in circle) emb 1,048,850 Findlay Electric Porcelain Co. 1-1/8" diameter; reversible
RR-07 RR-07.jpg (16380 bytes) RR-07_F.jpg (16915 bytes) F / PATD / 12-31 / 12 (in circle) emb 1,048,850 Findlay Electric Porcelain Co. 1-1/4" diameter; reversible, crossover knob; error date 12-13 instead of 12-31
RR-10 RR-10.jpg (29800 bytes) RR-10a.jpg (33739 bytes) O. P. / CO. / NO. 1 // PAT. / APR. 8 03 emb 697,001 Ohio Porcelain Co. 1-3/8" diameter; reversible
RR-05 PAT. / APP.D. / FOR / G. (in circle, G inside circle) emb     1-1/8" diameter; reversible
RR-11 RR-11.jpg (18471 bytes) RR-11a.jpg (22555 bytes) PATD / 24 / 085 / 1611 (circle) emb 992,570   1-1/8" diameter; reversible
RR-04 T / PATD 7-20 / 1915 emb 1,147,498 Trenton Porcelain Co. 1-1/8" diameter; reversible
RR-03 T P I / NO 1 / T / PAT / APR / 803 emb 697,001 R. Thomas & Sons Co. 1-3/8" diameter, reversible, error date, should be 4-8-02
RR-08 RR-08.jpg (18943 bytes) RR-08_Thomas.jpg (21798 bytes) T P I / NO 2 / THOMAS / PAT / APR / 8 03 emb 697,001 R. Thomas & Sons Co. 1-3/4" diameter; reversible
    Square Reversible Split Knobs,  Square Knobs, and Misc. Knobs        
SR-01 U S / PATD / 2408 / 5 16 11 emb 992,570 US Electric Porcelain Co. reversible
SR-02 Triangle M / PAT'D / FEB 9 / 1915 emb 1,127,776 Illinois Electric Porcelain Co. reversible
SR-03 PAT'D / U S (on short end) emb 878,302 US Electric Porcelain Co. reversible
SR-04   U S / PAT'D (on long end) emb 878,302 US Electric Porcelain Co. reversible (found at General Porcelain Co. site)
SR-05 O P / CO emb 878,302 Ohio Porcelain Co. reversible
S-03   MACOMB. / PAT. / MAR-1-04 // S-H. co. / No. 1. r-e 753,399 Illinois Electric Porcelain Co. Snyder-Hunt Co.
S-04   S H co. / no 1. // MACOMB. / PAT. / MAR-1-04 r-e 753,399 Illinois Electric Porcelain Co. Snyder-Hunt Co.
S-01 S-H Co. / No. 1 // A. P. C. L. / Pat. / Mar. 1, '04 emb 753,399 Adamant Porcelain Co. Ltd. Snyder-Hunt Co.
S-02 S-H Co. / No. 1 // MACOMB / PAT / MAR-1-04 r-e 753,399 Illinois Electric Porcelain Co. Snyder-Hunt Co.
S-05

Triangle M / PARALLEL / KNOB / PAT. APPL. FOR // E. L. KLINGEL / ST. PAUL emb / r-e 2,307,277 Illinois Electric Porcelain Co.  

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